1 //===--- DeclPrinter.cpp - Printing implementation for Decl ASTs ----------===//
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 implements the Decl::print method, which pretty prints the
11 // AST back out to C/Objective-C/C++/Objective-C++ code.
12 //
13 //===----------------------------------------------------------------------===//
14 #include "clang/AST/ASTContext.h"
15 #include "clang/AST/Attr.h"
16 #include "clang/AST/Decl.h"
17 #include "clang/AST/DeclCXX.h"
18 #include "clang/AST/DeclObjC.h"
19 #include "clang/AST/DeclVisitor.h"
20 #include "clang/AST/Expr.h"
21 #include "clang/AST/ExprCXX.h"
22 #include "clang/AST/PrettyPrinter.h"
23 #include "clang/Basic/Module.h"
24 #include "llvm/Support/raw_ostream.h"
25 using namespace clang;
26 
27 namespace {
28   class DeclPrinter : public DeclVisitor<DeclPrinter> {
29     raw_ostream &Out;
30     PrintingPolicy Policy;
31     const ASTContext &Context;
32     unsigned Indentation;
33     bool PrintInstantiation;
34 
35     raw_ostream& Indent() { return Indent(Indentation); }
36     raw_ostream& Indent(unsigned Indentation);
37     void ProcessDeclGroup(SmallVectorImpl<Decl*>& Decls);
38 
39     void Print(AccessSpecifier AS);
40     void PrintConstructorInitializers(CXXConstructorDecl *CDecl,
41                                       std::string &Proto);
42 
43     /// Print an Objective-C method type in parentheses.
44     ///
45     /// \param Quals The Objective-C declaration qualifiers.
46     /// \param T The type to print.
47     void PrintObjCMethodType(ASTContext &Ctx, Decl::ObjCDeclQualifier Quals,
48                              QualType T);
49 
50     void PrintObjCTypeParams(ObjCTypeParamList *Params);
51 
52   public:
53     DeclPrinter(raw_ostream &Out, const PrintingPolicy &Policy,
54                 const ASTContext &Context, unsigned Indentation = 0,
55                 bool PrintInstantiation = false)
56         : Out(Out), Policy(Policy), Context(Context), Indentation(Indentation),
57           PrintInstantiation(PrintInstantiation) {}
58 
59     void VisitDeclContext(DeclContext *DC, bool Indent = true);
60 
61     void VisitTranslationUnitDecl(TranslationUnitDecl *D);
62     void VisitTypedefDecl(TypedefDecl *D);
63     void VisitTypeAliasDecl(TypeAliasDecl *D);
64     void VisitEnumDecl(EnumDecl *D);
65     void VisitRecordDecl(RecordDecl *D);
66     void VisitEnumConstantDecl(EnumConstantDecl *D);
67     void VisitEmptyDecl(EmptyDecl *D);
68     void VisitFunctionDecl(FunctionDecl *D);
69     void VisitFriendDecl(FriendDecl *D);
70     void VisitFieldDecl(FieldDecl *D);
71     void VisitVarDecl(VarDecl *D);
72     void VisitLabelDecl(LabelDecl *D);
73     void VisitParmVarDecl(ParmVarDecl *D);
74     void VisitFileScopeAsmDecl(FileScopeAsmDecl *D);
75     void VisitImportDecl(ImportDecl *D);
76     void VisitStaticAssertDecl(StaticAssertDecl *D);
77     void VisitNamespaceDecl(NamespaceDecl *D);
78     void VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
79     void VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
80     void VisitCXXRecordDecl(CXXRecordDecl *D);
81     void VisitLinkageSpecDecl(LinkageSpecDecl *D);
82     void VisitTemplateDecl(const TemplateDecl *D);
83     void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
84     void VisitClassTemplateDecl(ClassTemplateDecl *D);
85     void VisitClassTemplateSpecializationDecl(
86                                             ClassTemplateSpecializationDecl *D);
87     void VisitClassTemplatePartialSpecializationDecl(
88                                      ClassTemplatePartialSpecializationDecl *D);
89     void VisitObjCMethodDecl(ObjCMethodDecl *D);
90     void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
91     void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
92     void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
93     void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
94     void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
95     void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
96     void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
97     void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
98     void VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
99     void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
100     void VisitUsingDecl(UsingDecl *D);
101     void VisitUsingShadowDecl(UsingShadowDecl *D);
102     void VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D);
103     void VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D);
104     void VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D);
105 
106     void printTemplateParameters(const TemplateParameterList *Params);
107     void printTemplateArguments(const TemplateArgumentList &Args,
108                                 const TemplateParameterList *Params = nullptr);
109     void prettyPrintAttributes(Decl *D);
110     void prettyPrintPragmas(Decl *D);
111     void printDeclType(QualType T, StringRef DeclName, bool Pack = false);
112   };
113 }
114 
115 void Decl::print(raw_ostream &Out, unsigned Indentation,
116                  bool PrintInstantiation) const {
117   print(Out, getASTContext().getPrintingPolicy(), Indentation, PrintInstantiation);
118 }
119 
120 void Decl::print(raw_ostream &Out, const PrintingPolicy &Policy,
121                  unsigned Indentation, bool PrintInstantiation) const {
122   DeclPrinter Printer(Out, Policy, getASTContext(), Indentation,
123                       PrintInstantiation);
124   Printer.Visit(const_cast<Decl*>(this));
125 }
126 
127 static QualType GetBaseType(QualType T) {
128   // FIXME: This should be on the Type class!
129   QualType BaseType = T;
130   while (!BaseType->isSpecifierType()) {
131     if (const PointerType *PTy = BaseType->getAs<PointerType>())
132       BaseType = PTy->getPointeeType();
133     else if (const BlockPointerType *BPy = BaseType->getAs<BlockPointerType>())
134       BaseType = BPy->getPointeeType();
135     else if (const ArrayType* ATy = dyn_cast<ArrayType>(BaseType))
136       BaseType = ATy->getElementType();
137     else if (const FunctionType* FTy = BaseType->getAs<FunctionType>())
138       BaseType = FTy->getReturnType();
139     else if (const VectorType *VTy = BaseType->getAs<VectorType>())
140       BaseType = VTy->getElementType();
141     else if (const ReferenceType *RTy = BaseType->getAs<ReferenceType>())
142       BaseType = RTy->getPointeeType();
143     else if (const AutoType *ATy = BaseType->getAs<AutoType>())
144       BaseType = ATy->getDeducedType();
145     else if (const ParenType *PTy = BaseType->getAs<ParenType>())
146       BaseType = PTy->desugar();
147     else
148       // This must be a syntax error.
149       break;
150   }
151   return BaseType;
152 }
153 
154 static QualType getDeclType(Decl* D) {
155   if (TypedefNameDecl* TDD = dyn_cast<TypedefNameDecl>(D))
156     return TDD->getUnderlyingType();
157   if (ValueDecl* VD = dyn_cast<ValueDecl>(D))
158     return VD->getType();
159   return QualType();
160 }
161 
162 void Decl::printGroup(Decl** Begin, unsigned NumDecls,
163                       raw_ostream &Out, const PrintingPolicy &Policy,
164                       unsigned Indentation) {
165   if (NumDecls == 1) {
166     (*Begin)->print(Out, Policy, Indentation);
167     return;
168   }
169 
170   Decl** End = Begin + NumDecls;
171   TagDecl* TD = dyn_cast<TagDecl>(*Begin);
172   if (TD)
173     ++Begin;
174 
175   PrintingPolicy SubPolicy(Policy);
176 
177   bool isFirst = true;
178   for ( ; Begin != End; ++Begin) {
179     if (isFirst) {
180       if(TD)
181         SubPolicy.IncludeTagDefinition = true;
182       SubPolicy.SuppressSpecifiers = false;
183       isFirst = false;
184     } else {
185       if (!isFirst) Out << ", ";
186       SubPolicy.IncludeTagDefinition = false;
187       SubPolicy.SuppressSpecifiers = true;
188     }
189 
190     (*Begin)->print(Out, SubPolicy, Indentation);
191   }
192 }
193 
194 LLVM_DUMP_METHOD void DeclContext::dumpDeclContext() const {
195   // Get the translation unit
196   const DeclContext *DC = this;
197   while (!DC->isTranslationUnit())
198     DC = DC->getParent();
199 
200   ASTContext &Ctx = cast<TranslationUnitDecl>(DC)->getASTContext();
201   DeclPrinter Printer(llvm::errs(), Ctx.getPrintingPolicy(), Ctx, 0);
202   Printer.VisitDeclContext(const_cast<DeclContext *>(this), /*Indent=*/false);
203 }
204 
205 raw_ostream& DeclPrinter::Indent(unsigned Indentation) {
206   for (unsigned i = 0; i != Indentation; ++i)
207     Out << "  ";
208   return Out;
209 }
210 
211 void DeclPrinter::prettyPrintAttributes(Decl *D) {
212   if (Policy.PolishForDeclaration)
213     return;
214 
215   if (D->hasAttrs()) {
216     AttrVec &Attrs = D->getAttrs();
217     for (auto *A : Attrs) {
218       switch (A->getKind()) {
219 #define ATTR(X)
220 #define PRAGMA_SPELLING_ATTR(X) case attr::X:
221 #include "clang/Basic/AttrList.inc"
222         break;
223       default:
224         A->printPretty(Out, Policy);
225         break;
226       }
227     }
228   }
229 }
230 
231 void DeclPrinter::prettyPrintPragmas(Decl *D) {
232   if (Policy.PolishForDeclaration)
233     return;
234 
235   if (D->hasAttrs()) {
236     AttrVec &Attrs = D->getAttrs();
237     for (auto *A : Attrs) {
238       switch (A->getKind()) {
239 #define ATTR(X)
240 #define PRAGMA_SPELLING_ATTR(X) case attr::X:
241 #include "clang/Basic/AttrList.inc"
242         A->printPretty(Out, Policy);
243         Indent();
244         break;
245       default:
246         break;
247       }
248     }
249   }
250 }
251 
252 void DeclPrinter::printDeclType(QualType T, StringRef DeclName, bool Pack) {
253   // Normally, a PackExpansionType is written as T[3]... (for instance, as a
254   // template argument), but if it is the type of a declaration, the ellipsis
255   // is placed before the name being declared.
256   if (auto *PET = T->getAs<PackExpansionType>()) {
257     Pack = true;
258     T = PET->getPattern();
259   }
260   T.print(Out, Policy, (Pack ? "..." : "") + DeclName, Indentation);
261 }
262 
263 void DeclPrinter::ProcessDeclGroup(SmallVectorImpl<Decl*>& Decls) {
264   this->Indent();
265   Decl::printGroup(Decls.data(), Decls.size(), Out, Policy, Indentation);
266   Out << ";\n";
267   Decls.clear();
268 
269 }
270 
271 void DeclPrinter::Print(AccessSpecifier AS) {
272   switch(AS) {
273   case AS_none:      llvm_unreachable("No access specifier!");
274   case AS_public:    Out << "public"; break;
275   case AS_protected: Out << "protected"; break;
276   case AS_private:   Out << "private"; break;
277   }
278 }
279 
280 void DeclPrinter::PrintConstructorInitializers(CXXConstructorDecl *CDecl,
281                                                std::string &Proto) {
282   bool HasInitializerList = false;
283   for (const auto *BMInitializer : CDecl->inits()) {
284     if (BMInitializer->isInClassMemberInitializer())
285       continue;
286 
287     if (!HasInitializerList) {
288       Proto += " : ";
289       Out << Proto;
290       Proto.clear();
291       HasInitializerList = true;
292     } else
293       Out << ", ";
294 
295     if (BMInitializer->isAnyMemberInitializer()) {
296       FieldDecl *FD = BMInitializer->getAnyMember();
297       Out << *FD;
298     } else {
299       Out << QualType(BMInitializer->getBaseClass(), 0).getAsString(Policy);
300     }
301 
302     Out << "(";
303     if (!BMInitializer->getInit()) {
304       // Nothing to print
305     } else {
306       Expr *Init = BMInitializer->getInit();
307       if (ExprWithCleanups *Tmp = dyn_cast<ExprWithCleanups>(Init))
308         Init = Tmp->getSubExpr();
309 
310       Init = Init->IgnoreParens();
311 
312       Expr *SimpleInit = nullptr;
313       Expr **Args = nullptr;
314       unsigned NumArgs = 0;
315       if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
316         Args = ParenList->getExprs();
317         NumArgs = ParenList->getNumExprs();
318       } else if (CXXConstructExpr *Construct =
319                      dyn_cast<CXXConstructExpr>(Init)) {
320         Args = Construct->getArgs();
321         NumArgs = Construct->getNumArgs();
322       } else
323         SimpleInit = Init;
324 
325       if (SimpleInit)
326         SimpleInit->printPretty(Out, nullptr, Policy, Indentation);
327       else {
328         for (unsigned I = 0; I != NumArgs; ++I) {
329           assert(Args[I] != nullptr && "Expected non-null Expr");
330           if (isa<CXXDefaultArgExpr>(Args[I]))
331             break;
332 
333           if (I)
334             Out << ", ";
335           Args[I]->printPretty(Out, nullptr, Policy, Indentation);
336         }
337       }
338     }
339     Out << ")";
340     if (BMInitializer->isPackExpansion())
341       Out << "...";
342   }
343 }
344 
345 //----------------------------------------------------------------------------
346 // Common C declarations
347 //----------------------------------------------------------------------------
348 
349 void DeclPrinter::VisitDeclContext(DeclContext *DC, bool Indent) {
350   if (Policy.TerseOutput)
351     return;
352 
353   if (Indent)
354     Indentation += Policy.Indentation;
355 
356   SmallVector<Decl*, 2> Decls;
357   for (DeclContext::decl_iterator D = DC->decls_begin(), DEnd = DC->decls_end();
358        D != DEnd; ++D) {
359 
360     // Don't print ObjCIvarDecls, as they are printed when visiting the
361     // containing ObjCInterfaceDecl.
362     if (isa<ObjCIvarDecl>(*D))
363       continue;
364 
365     // Skip over implicit declarations in pretty-printing mode.
366     if (D->isImplicit())
367       continue;
368 
369     // Don't print implicit specializations, as they are printed when visiting
370     // corresponding templates.
371     if (auto FD = dyn_cast<FunctionDecl>(*D))
372       if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation &&
373           !isa<ClassTemplateSpecializationDecl>(DC))
374         continue;
375 
376     // The next bits of code handles stuff like "struct {int x;} a,b"; we're
377     // forced to merge the declarations because there's no other way to
378     // refer to the struct in question.  This limited merging is safe without
379     // a bunch of other checks because it only merges declarations directly
380     // referring to the tag, not typedefs.
381     //
382     // Check whether the current declaration should be grouped with a previous
383     // unnamed struct.
384     QualType CurDeclType = getDeclType(*D);
385     if (!Decls.empty() && !CurDeclType.isNull()) {
386       QualType BaseType = GetBaseType(CurDeclType);
387       if (!BaseType.isNull() && isa<ElaboratedType>(BaseType))
388         BaseType = cast<ElaboratedType>(BaseType)->getNamedType();
389       if (!BaseType.isNull() && isa<TagType>(BaseType) &&
390           cast<TagType>(BaseType)->getDecl() == Decls[0]) {
391         Decls.push_back(*D);
392         continue;
393       }
394     }
395 
396     // If we have a merged group waiting to be handled, handle it now.
397     if (!Decls.empty())
398       ProcessDeclGroup(Decls);
399 
400     // If the current declaration is an unnamed tag type, save it
401     // so we can merge it with the subsequent declaration(s) using it.
402     if (isa<TagDecl>(*D) && !cast<TagDecl>(*D)->getIdentifier()) {
403       Decls.push_back(*D);
404       continue;
405     }
406 
407     if (isa<AccessSpecDecl>(*D)) {
408       Indentation -= Policy.Indentation;
409       this->Indent();
410       Print(D->getAccess());
411       Out << ":\n";
412       Indentation += Policy.Indentation;
413       continue;
414     }
415 
416     this->Indent();
417     Visit(*D);
418 
419     // FIXME: Need to be able to tell the DeclPrinter when
420     const char *Terminator = nullptr;
421     if (isa<OMPThreadPrivateDecl>(*D) || isa<OMPDeclareReductionDecl>(*D))
422       Terminator = nullptr;
423     else if (isa<ObjCMethodDecl>(*D) && cast<ObjCMethodDecl>(*D)->hasBody())
424       Terminator = nullptr;
425     else if (auto FD = dyn_cast<FunctionDecl>(*D)) {
426       if (FD->isThisDeclarationADefinition())
427         Terminator = nullptr;
428       else
429         Terminator = ";";
430     } else if (auto TD = dyn_cast<FunctionTemplateDecl>(*D)) {
431       if (TD->getTemplatedDecl()->isThisDeclarationADefinition())
432         Terminator = nullptr;
433       else
434         Terminator = ";";
435     } else if (isa<NamespaceDecl>(*D) || isa<LinkageSpecDecl>(*D) ||
436              isa<ObjCImplementationDecl>(*D) ||
437              isa<ObjCInterfaceDecl>(*D) ||
438              isa<ObjCProtocolDecl>(*D) ||
439              isa<ObjCCategoryImplDecl>(*D) ||
440              isa<ObjCCategoryDecl>(*D))
441       Terminator = nullptr;
442     else if (isa<EnumConstantDecl>(*D)) {
443       DeclContext::decl_iterator Next = D;
444       ++Next;
445       if (Next != DEnd)
446         Terminator = ",";
447     } else
448       Terminator = ";";
449 
450     if (Terminator)
451       Out << Terminator;
452     if (!Policy.TerseOutput &&
453         ((isa<FunctionDecl>(*D) &&
454           cast<FunctionDecl>(*D)->doesThisDeclarationHaveABody()) ||
455          (isa<FunctionTemplateDecl>(*D) &&
456           cast<FunctionTemplateDecl>(*D)->getTemplatedDecl()->doesThisDeclarationHaveABody())))
457       ; // StmtPrinter already added '\n' after CompoundStmt.
458     else
459       Out << "\n";
460 
461     // Declare target attribute is special one, natural spelling for the pragma
462     // assumes "ending" construct so print it here.
463     if (D->hasAttr<OMPDeclareTargetDeclAttr>())
464       Out << "#pragma omp end declare target\n";
465   }
466 
467   if (!Decls.empty())
468     ProcessDeclGroup(Decls);
469 
470   if (Indent)
471     Indentation -= Policy.Indentation;
472 }
473 
474 void DeclPrinter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
475   VisitDeclContext(D, false);
476 }
477 
478 void DeclPrinter::VisitTypedefDecl(TypedefDecl *D) {
479   if (!Policy.SuppressSpecifiers) {
480     Out << "typedef ";
481 
482     if (D->isModulePrivate())
483       Out << "__module_private__ ";
484   }
485   QualType Ty = D->getTypeSourceInfo()->getType();
486   Ty.print(Out, Policy, D->getName(), Indentation);
487   prettyPrintAttributes(D);
488 }
489 
490 void DeclPrinter::VisitTypeAliasDecl(TypeAliasDecl *D) {
491   Out << "using " << *D;
492   prettyPrintAttributes(D);
493   Out << " = " << D->getTypeSourceInfo()->getType().getAsString(Policy);
494 }
495 
496 void DeclPrinter::VisitEnumDecl(EnumDecl *D) {
497   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
498     Out << "__module_private__ ";
499   Out << "enum";
500   if (D->isScoped()) {
501     if (D->isScopedUsingClassTag())
502       Out << " class";
503     else
504       Out << " struct";
505   }
506 
507   prettyPrintAttributes(D);
508 
509   Out << ' ' << *D;
510 
511   if (D->isFixed() && D->getASTContext().getLangOpts().CPlusPlus11)
512     Out << " : " << D->getIntegerType().stream(Policy);
513 
514   if (D->isCompleteDefinition()) {
515     Out << " {\n";
516     VisitDeclContext(D);
517     Indent() << "}";
518   }
519 }
520 
521 void DeclPrinter::VisitRecordDecl(RecordDecl *D) {
522   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
523     Out << "__module_private__ ";
524   Out << D->getKindName();
525 
526   prettyPrintAttributes(D);
527 
528   if (D->getIdentifier())
529     Out << ' ' << *D;
530 
531   if (D->isCompleteDefinition()) {
532     Out << " {\n";
533     VisitDeclContext(D);
534     Indent() << "}";
535   }
536 }
537 
538 void DeclPrinter::VisitEnumConstantDecl(EnumConstantDecl *D) {
539   Out << *D;
540   prettyPrintAttributes(D);
541   if (Expr *Init = D->getInitExpr()) {
542     Out << " = ";
543     Init->printPretty(Out, nullptr, Policy, Indentation, &Context);
544   }
545 }
546 
547 void DeclPrinter::VisitFunctionDecl(FunctionDecl *D) {
548   if (!D->getDescribedFunctionTemplate() &&
549       !D->isFunctionTemplateSpecialization())
550     prettyPrintPragmas(D);
551 
552   if (D->isFunctionTemplateSpecialization())
553     Out << "template<> ";
554   else if (!D->getDescribedFunctionTemplate()) {
555     for (unsigned I = 0, NumTemplateParams = D->getNumTemplateParameterLists();
556          I < NumTemplateParams; ++I)
557       printTemplateParameters(D->getTemplateParameterList(I));
558   }
559 
560   CXXConstructorDecl *CDecl = dyn_cast<CXXConstructorDecl>(D);
561   CXXConversionDecl *ConversionDecl = dyn_cast<CXXConversionDecl>(D);
562   CXXDeductionGuideDecl *GuideDecl = dyn_cast<CXXDeductionGuideDecl>(D);
563   if (!Policy.SuppressSpecifiers) {
564     switch (D->getStorageClass()) {
565     case SC_None: break;
566     case SC_Extern: Out << "extern "; break;
567     case SC_Static: Out << "static "; break;
568     case SC_PrivateExtern: Out << "__private_extern__ "; break;
569     case SC_Auto: case SC_Register:
570       llvm_unreachable("invalid for functions");
571     }
572 
573     if (D->isInlineSpecified())  Out << "inline ";
574     if (D->isVirtualAsWritten()) Out << "virtual ";
575     if (D->isModulePrivate())    Out << "__module_private__ ";
576     if (D->isConstexpr() && !D->isExplicitlyDefaulted()) Out << "constexpr ";
577     if ((CDecl && CDecl->isExplicitSpecified()) ||
578         (ConversionDecl && ConversionDecl->isExplicitSpecified()) ||
579         (GuideDecl && GuideDecl->isExplicitSpecified()))
580       Out << "explicit ";
581   }
582 
583   PrintingPolicy SubPolicy(Policy);
584   SubPolicy.SuppressSpecifiers = false;
585   std::string Proto;
586 
587   if (Policy.FullyQualifiedName) {
588     Proto += D->getQualifiedNameAsString();
589   } else {
590     if (!Policy.SuppressScope) {
591       if (const NestedNameSpecifier *NS = D->getQualifier()) {
592         llvm::raw_string_ostream OS(Proto);
593         NS->print(OS, Policy);
594       }
595     }
596     Proto += D->getNameInfo().getAsString();
597   }
598 
599   if (GuideDecl)
600     Proto = GuideDecl->getDeducedTemplate()->getDeclName().getAsString();
601   if (const TemplateArgumentList *TArgs = D->getTemplateSpecializationArgs()) {
602     llvm::raw_string_ostream POut(Proto);
603     DeclPrinter TArgPrinter(POut, SubPolicy, Context, Indentation);
604     TArgPrinter.printTemplateArguments(*TArgs);
605   }
606 
607   QualType Ty = D->getType();
608   while (const ParenType *PT = dyn_cast<ParenType>(Ty)) {
609     Proto = '(' + Proto + ')';
610     Ty = PT->getInnerType();
611   }
612 
613   if (const FunctionType *AFT = Ty->getAs<FunctionType>()) {
614     const FunctionProtoType *FT = nullptr;
615     if (D->hasWrittenPrototype())
616       FT = dyn_cast<FunctionProtoType>(AFT);
617 
618     Proto += "(";
619     if (FT) {
620       llvm::raw_string_ostream POut(Proto);
621       DeclPrinter ParamPrinter(POut, SubPolicy, Context, Indentation);
622       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
623         if (i) POut << ", ";
624         ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
625       }
626 
627       if (FT->isVariadic()) {
628         if (D->getNumParams()) POut << ", ";
629         POut << "...";
630       }
631     } else if (D->doesThisDeclarationHaveABody() && !D->hasPrototype()) {
632       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
633         if (i)
634           Proto += ", ";
635         Proto += D->getParamDecl(i)->getNameAsString();
636       }
637     }
638 
639     Proto += ")";
640 
641     if (FT) {
642       if (FT->isConst())
643         Proto += " const";
644       if (FT->isVolatile())
645         Proto += " volatile";
646       if (FT->isRestrict())
647         Proto += " restrict";
648 
649       switch (FT->getRefQualifier()) {
650       case RQ_None:
651         break;
652       case RQ_LValue:
653         Proto += " &";
654         break;
655       case RQ_RValue:
656         Proto += " &&";
657         break;
658       }
659     }
660 
661     if (FT && FT->hasDynamicExceptionSpec()) {
662       Proto += " throw(";
663       if (FT->getExceptionSpecType() == EST_MSAny)
664         Proto += "...";
665       else
666         for (unsigned I = 0, N = FT->getNumExceptions(); I != N; ++I) {
667           if (I)
668             Proto += ", ";
669 
670           Proto += FT->getExceptionType(I).getAsString(SubPolicy);
671         }
672       Proto += ")";
673     } else if (FT && isNoexceptExceptionSpec(FT->getExceptionSpecType())) {
674       Proto += " noexcept";
675       if (isComputedNoexcept(FT->getExceptionSpecType())) {
676         Proto += "(";
677         llvm::raw_string_ostream EOut(Proto);
678         FT->getNoexceptExpr()->printPretty(EOut, nullptr, SubPolicy,
679                                            Indentation);
680         EOut.flush();
681         Proto += EOut.str();
682         Proto += ")";
683       }
684     }
685 
686     if (CDecl) {
687       if (!Policy.TerseOutput)
688         PrintConstructorInitializers(CDecl, Proto);
689     } else if (!ConversionDecl && !isa<CXXDestructorDecl>(D)) {
690       if (FT && FT->hasTrailingReturn()) {
691         if (!GuideDecl)
692           Out << "auto ";
693         Out << Proto << " -> ";
694         Proto.clear();
695       }
696       AFT->getReturnType().print(Out, Policy, Proto);
697       Proto.clear();
698     }
699     Out << Proto;
700   } else {
701     Ty.print(Out, Policy, Proto);
702   }
703 
704   prettyPrintAttributes(D);
705 
706   if (D->isPure())
707     Out << " = 0";
708   else if (D->isDeletedAsWritten())
709     Out << " = delete";
710   else if (D->isExplicitlyDefaulted())
711     Out << " = default";
712   else if (D->doesThisDeclarationHaveABody()) {
713     if (!Policy.TerseOutput) {
714       if (!D->hasPrototype() && D->getNumParams()) {
715         // This is a K&R function definition, so we need to print the
716         // parameters.
717         Out << '\n';
718         DeclPrinter ParamPrinter(Out, SubPolicy, Context, Indentation);
719         Indentation += Policy.Indentation;
720         for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
721           Indent();
722           ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
723           Out << ";\n";
724         }
725         Indentation -= Policy.Indentation;
726       } else
727         Out << ' ';
728 
729       if (D->getBody())
730         D->getBody()->printPretty(Out, nullptr, SubPolicy, Indentation);
731     } else {
732       if (!Policy.TerseOutput && isa<CXXConstructorDecl>(*D))
733         Out << " {}";
734     }
735   }
736 }
737 
738 void DeclPrinter::VisitFriendDecl(FriendDecl *D) {
739   if (TypeSourceInfo *TSI = D->getFriendType()) {
740     unsigned NumTPLists = D->getFriendTypeNumTemplateParameterLists();
741     for (unsigned i = 0; i < NumTPLists; ++i)
742       printTemplateParameters(D->getFriendTypeTemplateParameterList(i));
743     Out << "friend ";
744     Out << " " << TSI->getType().getAsString(Policy);
745   }
746   else if (FunctionDecl *FD =
747       dyn_cast<FunctionDecl>(D->getFriendDecl())) {
748     Out << "friend ";
749     VisitFunctionDecl(FD);
750   }
751   else if (FunctionTemplateDecl *FTD =
752            dyn_cast<FunctionTemplateDecl>(D->getFriendDecl())) {
753     Out << "friend ";
754     VisitFunctionTemplateDecl(FTD);
755   }
756   else if (ClassTemplateDecl *CTD =
757            dyn_cast<ClassTemplateDecl>(D->getFriendDecl())) {
758     Out << "friend ";
759     VisitRedeclarableTemplateDecl(CTD);
760   }
761 }
762 
763 void DeclPrinter::VisitFieldDecl(FieldDecl *D) {
764   // FIXME: add printing of pragma attributes if required.
765   if (!Policy.SuppressSpecifiers && D->isMutable())
766     Out << "mutable ";
767   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
768     Out << "__module_private__ ";
769 
770   Out << D->getASTContext().getUnqualifiedObjCPointerType(D->getType()).
771          stream(Policy, D->getName(), Indentation);
772 
773   if (D->isBitField()) {
774     Out << " : ";
775     D->getBitWidth()->printPretty(Out, nullptr, Policy, Indentation);
776   }
777 
778   Expr *Init = D->getInClassInitializer();
779   if (!Policy.SuppressInitializers && Init) {
780     if (D->getInClassInitStyle() == ICIS_ListInit)
781       Out << " ";
782     else
783       Out << " = ";
784     Init->printPretty(Out, nullptr, Policy, Indentation);
785   }
786   prettyPrintAttributes(D);
787 }
788 
789 void DeclPrinter::VisitLabelDecl(LabelDecl *D) {
790   Out << *D << ":";
791 }
792 
793 void DeclPrinter::VisitVarDecl(VarDecl *D) {
794   prettyPrintPragmas(D);
795 
796   QualType T = D->getTypeSourceInfo()
797     ? D->getTypeSourceInfo()->getType()
798     : D->getASTContext().getUnqualifiedObjCPointerType(D->getType());
799 
800   if (!Policy.SuppressSpecifiers) {
801     StorageClass SC = D->getStorageClass();
802     if (SC != SC_None)
803       Out << VarDecl::getStorageClassSpecifierString(SC) << " ";
804 
805     switch (D->getTSCSpec()) {
806     case TSCS_unspecified:
807       break;
808     case TSCS___thread:
809       Out << "__thread ";
810       break;
811     case TSCS__Thread_local:
812       Out << "_Thread_local ";
813       break;
814     case TSCS_thread_local:
815       Out << "thread_local ";
816       break;
817     }
818 
819     if (D->isModulePrivate())
820       Out << "__module_private__ ";
821 
822     if (D->isConstexpr()) {
823       Out << "constexpr ";
824       T.removeLocalConst();
825     }
826   }
827 
828   printDeclType(T, D->getName());
829   Expr *Init = D->getInit();
830   if (!Policy.SuppressInitializers && Init) {
831     bool ImplicitInit = false;
832     if (CXXConstructExpr *Construct =
833             dyn_cast<CXXConstructExpr>(Init->IgnoreImplicit())) {
834       if (D->getInitStyle() == VarDecl::CallInit &&
835           !Construct->isListInitialization()) {
836         ImplicitInit = Construct->getNumArgs() == 0 ||
837           Construct->getArg(0)->isDefaultArgument();
838       }
839     }
840     if (!ImplicitInit) {
841       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
842         Out << "(";
843       else if (D->getInitStyle() == VarDecl::CInit) {
844         Out << " = ";
845       }
846       PrintingPolicy SubPolicy(Policy);
847       SubPolicy.SuppressSpecifiers = false;
848       SubPolicy.IncludeTagDefinition = false;
849       Init->printPretty(Out, nullptr, SubPolicy, Indentation);
850       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
851         Out << ")";
852     }
853   }
854   prettyPrintAttributes(D);
855 }
856 
857 void DeclPrinter::VisitParmVarDecl(ParmVarDecl *D) {
858   VisitVarDecl(D);
859 }
860 
861 void DeclPrinter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
862   Out << "__asm (";
863   D->getAsmString()->printPretty(Out, nullptr, Policy, Indentation);
864   Out << ")";
865 }
866 
867 void DeclPrinter::VisitImportDecl(ImportDecl *D) {
868   Out << "@import " << D->getImportedModule()->getFullModuleName()
869       << ";\n";
870 }
871 
872 void DeclPrinter::VisitStaticAssertDecl(StaticAssertDecl *D) {
873   Out << "static_assert(";
874   D->getAssertExpr()->printPretty(Out, nullptr, Policy, Indentation);
875   if (StringLiteral *SL = D->getMessage()) {
876     Out << ", ";
877     SL->printPretty(Out, nullptr, Policy, Indentation);
878   }
879   Out << ")";
880 }
881 
882 //----------------------------------------------------------------------------
883 // C++ declarations
884 //----------------------------------------------------------------------------
885 void DeclPrinter::VisitNamespaceDecl(NamespaceDecl *D) {
886   if (D->isInline())
887     Out << "inline ";
888   Out << "namespace " << *D << " {\n";
889   VisitDeclContext(D);
890   Indent() << "}";
891 }
892 
893 void DeclPrinter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
894   Out << "using namespace ";
895   if (D->getQualifier())
896     D->getQualifier()->print(Out, Policy);
897   Out << *D->getNominatedNamespaceAsWritten();
898 }
899 
900 void DeclPrinter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
901   Out << "namespace " << *D << " = ";
902   if (D->getQualifier())
903     D->getQualifier()->print(Out, Policy);
904   Out << *D->getAliasedNamespace();
905 }
906 
907 void DeclPrinter::VisitEmptyDecl(EmptyDecl *D) {
908   prettyPrintAttributes(D);
909 }
910 
911 void DeclPrinter::VisitCXXRecordDecl(CXXRecordDecl *D) {
912   // FIXME: add printing of pragma attributes if required.
913   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
914     Out << "__module_private__ ";
915   Out << D->getKindName();
916 
917   prettyPrintAttributes(D);
918 
919   if (D->getIdentifier()) {
920     Out << ' ' << *D;
921 
922     if (auto S = dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
923       printTemplateArguments(S->getTemplateArgs(), S->getTemplateParameters());
924     else if (auto S = dyn_cast<ClassTemplateSpecializationDecl>(D))
925       printTemplateArguments(S->getTemplateArgs());
926   }
927 
928   if (D->isCompleteDefinition()) {
929     // Print the base classes
930     if (D->getNumBases()) {
931       Out << " : ";
932       for (CXXRecordDecl::base_class_iterator Base = D->bases_begin(),
933              BaseEnd = D->bases_end(); Base != BaseEnd; ++Base) {
934         if (Base != D->bases_begin())
935           Out << ", ";
936 
937         if (Base->isVirtual())
938           Out << "virtual ";
939 
940         AccessSpecifier AS = Base->getAccessSpecifierAsWritten();
941         if (AS != AS_none) {
942           Print(AS);
943           Out << " ";
944         }
945         Out << Base->getType().getAsString(Policy);
946 
947         if (Base->isPackExpansion())
948           Out << "...";
949       }
950     }
951 
952     // Print the class definition
953     // FIXME: Doesn't print access specifiers, e.g., "public:"
954     if (Policy.TerseOutput) {
955       Out << " {}";
956     } else {
957       Out << " {\n";
958       VisitDeclContext(D);
959       Indent() << "}";
960     }
961   }
962 }
963 
964 void DeclPrinter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
965   const char *l;
966   if (D->getLanguage() == LinkageSpecDecl::lang_c)
967     l = "C";
968   else {
969     assert(D->getLanguage() == LinkageSpecDecl::lang_cxx &&
970            "unknown language in linkage specification");
971     l = "C++";
972   }
973 
974   Out << "extern \"" << l << "\" ";
975   if (D->hasBraces()) {
976     Out << "{\n";
977     VisitDeclContext(D);
978     Indent() << "}";
979   } else
980     Visit(*D->decls_begin());
981 }
982 
983 void DeclPrinter::printTemplateParameters(const TemplateParameterList *Params) {
984   assert(Params);
985 
986   Out << "template <";
987 
988   for (unsigned i = 0, e = Params->size(); i != e; ++i) {
989     if (i != 0)
990       Out << ", ";
991 
992     const Decl *Param = Params->getParam(i);
993     if (auto TTP = dyn_cast<TemplateTypeParmDecl>(Param)) {
994 
995       if (TTP->wasDeclaredWithTypename())
996         Out << "typename ";
997       else
998         Out << "class ";
999 
1000       if (TTP->isParameterPack())
1001         Out << "...";
1002 
1003       Out << *TTP;
1004 
1005       if (TTP->hasDefaultArgument()) {
1006         Out << " = ";
1007         Out << TTP->getDefaultArgument().getAsString(Policy);
1008       };
1009     } else if (auto NTTP = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
1010       StringRef Name;
1011       if (IdentifierInfo *II = NTTP->getIdentifier())
1012         Name = II->getName();
1013       printDeclType(NTTP->getType(), Name, NTTP->isParameterPack());
1014 
1015       if (NTTP->hasDefaultArgument()) {
1016         Out << " = ";
1017         NTTP->getDefaultArgument()->printPretty(Out, nullptr, Policy,
1018                                                 Indentation);
1019       }
1020     } else if (auto TTPD = dyn_cast<TemplateTemplateParmDecl>(Param)) {
1021       VisitTemplateDecl(TTPD);
1022       // FIXME: print the default argument, if present.
1023     }
1024   }
1025 
1026   Out << "> ";
1027 }
1028 
1029 void DeclPrinter::printTemplateArguments(const TemplateArgumentList &Args,
1030                                          const TemplateParameterList *Params) {
1031   Out << "<";
1032   for (size_t I = 0, E = Args.size(); I < E; ++I) {
1033     const TemplateArgument &A = Args[I];
1034     if (I)
1035       Out << ", ";
1036     if (Params) {
1037       if (A.getKind() == TemplateArgument::Type)
1038         if (auto T = A.getAsType()->getAs<TemplateTypeParmType>()) {
1039           auto P = cast<TemplateTypeParmDecl>(Params->getParam(T->getIndex()));
1040           Out << *P;
1041           continue;
1042         }
1043       if (A.getKind() == TemplateArgument::Template) {
1044         if (auto T = A.getAsTemplate().getAsTemplateDecl())
1045           if (auto TD = dyn_cast<TemplateTemplateParmDecl>(T)) {
1046             auto P = cast<TemplateTemplateParmDecl>(
1047                                               Params->getParam(TD->getIndex()));
1048             Out << *P;
1049             continue;
1050           }
1051       }
1052       if (A.getKind() == TemplateArgument::Expression) {
1053         if (auto E = dyn_cast<DeclRefExpr>(A.getAsExpr()))
1054           if (auto N = dyn_cast<NonTypeTemplateParmDecl>(E->getDecl())) {
1055             auto P = cast<NonTypeTemplateParmDecl>(
1056                                                Params->getParam(N->getIndex()));
1057             Out << *P;
1058             continue;
1059           }
1060       }
1061     }
1062     A.print(Policy, Out);
1063   }
1064   Out << ">";
1065 }
1066 
1067 void DeclPrinter::VisitTemplateDecl(const TemplateDecl *D) {
1068   printTemplateParameters(D->getTemplateParameters());
1069 
1070   if (const TemplateTemplateParmDecl *TTP =
1071         dyn_cast<TemplateTemplateParmDecl>(D)) {
1072     Out << "class ";
1073     if (TTP->isParameterPack())
1074       Out << "...";
1075     Out << D->getName();
1076   } else {
1077     Visit(D->getTemplatedDecl());
1078   }
1079 }
1080 
1081 void DeclPrinter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1082   prettyPrintPragmas(D->getTemplatedDecl());
1083   // Print any leading template parameter lists.
1084   if (const FunctionDecl *FD = D->getTemplatedDecl()) {
1085     for (unsigned I = 0, NumTemplateParams = FD->getNumTemplateParameterLists();
1086          I < NumTemplateParams; ++I)
1087       printTemplateParameters(FD->getTemplateParameterList(I));
1088   }
1089   VisitRedeclarableTemplateDecl(D);
1090 
1091   // Never print "instantiations" for deduction guides (they don't really
1092   // have them).
1093   if (PrintInstantiation &&
1094       !isa<CXXDeductionGuideDecl>(D->getTemplatedDecl())) {
1095     FunctionDecl *PrevDecl = D->getTemplatedDecl();
1096     const FunctionDecl *Def;
1097     if (PrevDecl->isDefined(Def) && Def != PrevDecl)
1098       return;
1099     for (auto *I : D->specializations())
1100       if (I->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) {
1101         if (!PrevDecl->isThisDeclarationADefinition())
1102           Out << ";\n";
1103         Indent();
1104         prettyPrintPragmas(I);
1105         Visit(I);
1106       }
1107   }
1108 }
1109 
1110 void DeclPrinter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1111   VisitRedeclarableTemplateDecl(D);
1112 
1113   if (PrintInstantiation) {
1114     for (auto *I : D->specializations())
1115       if (I->getSpecializationKind() == TSK_ImplicitInstantiation) {
1116         if (D->isThisDeclarationADefinition())
1117           Out << ";";
1118         Out << "\n";
1119         Visit(I);
1120       }
1121   }
1122 }
1123 
1124 void DeclPrinter::VisitClassTemplateSpecializationDecl(
1125                                            ClassTemplateSpecializationDecl *D) {
1126   Out << "template<> ";
1127   VisitCXXRecordDecl(D);
1128 }
1129 
1130 void DeclPrinter::VisitClassTemplatePartialSpecializationDecl(
1131                                     ClassTemplatePartialSpecializationDecl *D) {
1132   printTemplateParameters(D->getTemplateParameters());
1133   VisitCXXRecordDecl(D);
1134 }
1135 
1136 //----------------------------------------------------------------------------
1137 // Objective-C declarations
1138 //----------------------------------------------------------------------------
1139 
1140 void DeclPrinter::PrintObjCMethodType(ASTContext &Ctx,
1141                                       Decl::ObjCDeclQualifier Quals,
1142                                       QualType T) {
1143   Out << '(';
1144   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_In)
1145     Out << "in ";
1146   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Inout)
1147     Out << "inout ";
1148   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Out)
1149     Out << "out ";
1150   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Bycopy)
1151     Out << "bycopy ";
1152   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Byref)
1153     Out << "byref ";
1154   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Oneway)
1155     Out << "oneway ";
1156   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_CSNullability) {
1157     if (auto nullability = AttributedType::stripOuterNullability(T))
1158       Out << getNullabilitySpelling(*nullability, true) << ' ';
1159   }
1160 
1161   Out << Ctx.getUnqualifiedObjCPointerType(T).getAsString(Policy);
1162   Out << ')';
1163 }
1164 
1165 void DeclPrinter::PrintObjCTypeParams(ObjCTypeParamList *Params) {
1166   Out << "<";
1167   unsigned First = true;
1168   for (auto *Param : *Params) {
1169     if (First) {
1170       First = false;
1171     } else {
1172       Out << ", ";
1173     }
1174 
1175     switch (Param->getVariance()) {
1176     case ObjCTypeParamVariance::Invariant:
1177       break;
1178 
1179     case ObjCTypeParamVariance::Covariant:
1180       Out << "__covariant ";
1181       break;
1182 
1183     case ObjCTypeParamVariance::Contravariant:
1184       Out << "__contravariant ";
1185       break;
1186     }
1187 
1188     Out << Param->getDeclName().getAsString();
1189 
1190     if (Param->hasExplicitBound()) {
1191       Out << " : " << Param->getUnderlyingType().getAsString(Policy);
1192     }
1193   }
1194   Out << ">";
1195 }
1196 
1197 void DeclPrinter::VisitObjCMethodDecl(ObjCMethodDecl *OMD) {
1198   if (OMD->isInstanceMethod())
1199     Out << "- ";
1200   else
1201     Out << "+ ";
1202   if (!OMD->getReturnType().isNull()) {
1203     PrintObjCMethodType(OMD->getASTContext(), OMD->getObjCDeclQualifier(),
1204                         OMD->getReturnType());
1205   }
1206 
1207   std::string name = OMD->getSelector().getAsString();
1208   std::string::size_type pos, lastPos = 0;
1209   for (const auto *PI : OMD->parameters()) {
1210     // FIXME: selector is missing here!
1211     pos = name.find_first_of(':', lastPos);
1212     if (lastPos != 0)
1213       Out << " ";
1214     Out << name.substr(lastPos, pos - lastPos) << ':';
1215     PrintObjCMethodType(OMD->getASTContext(),
1216                         PI->getObjCDeclQualifier(),
1217                         PI->getType());
1218     Out << *PI;
1219     lastPos = pos + 1;
1220   }
1221 
1222   if (OMD->param_begin() == OMD->param_end())
1223     Out << name;
1224 
1225   if (OMD->isVariadic())
1226       Out << ", ...";
1227 
1228   prettyPrintAttributes(OMD);
1229 
1230   if (OMD->getBody() && !Policy.TerseOutput) {
1231     Out << ' ';
1232     OMD->getBody()->printPretty(Out, nullptr, Policy);
1233   }
1234   else if (Policy.PolishForDeclaration)
1235     Out << ';';
1236 }
1237 
1238 void DeclPrinter::VisitObjCImplementationDecl(ObjCImplementationDecl *OID) {
1239   std::string I = OID->getNameAsString();
1240   ObjCInterfaceDecl *SID = OID->getSuperClass();
1241 
1242   bool eolnOut = false;
1243   if (SID)
1244     Out << "@implementation " << I << " : " << *SID;
1245   else
1246     Out << "@implementation " << I;
1247 
1248   if (OID->ivar_size() > 0) {
1249     Out << "{\n";
1250     eolnOut = true;
1251     Indentation += Policy.Indentation;
1252     for (const auto *I : OID->ivars()) {
1253       Indent() << I->getASTContext().getUnqualifiedObjCPointerType(I->getType()).
1254                     getAsString(Policy) << ' ' << *I << ";\n";
1255     }
1256     Indentation -= Policy.Indentation;
1257     Out << "}\n";
1258   }
1259   else if (SID || (OID->decls_begin() != OID->decls_end())) {
1260     Out << "\n";
1261     eolnOut = true;
1262   }
1263   VisitDeclContext(OID, false);
1264   if (!eolnOut)
1265     Out << "\n";
1266   Out << "@end";
1267 }
1268 
1269 void DeclPrinter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *OID) {
1270   std::string I = OID->getNameAsString();
1271   ObjCInterfaceDecl *SID = OID->getSuperClass();
1272 
1273   if (!OID->isThisDeclarationADefinition()) {
1274     Out << "@class " << I;
1275 
1276     if (auto TypeParams = OID->getTypeParamListAsWritten()) {
1277       PrintObjCTypeParams(TypeParams);
1278     }
1279 
1280     Out << ";";
1281     return;
1282   }
1283   bool eolnOut = false;
1284   Out << "@interface " << I;
1285 
1286   if (auto TypeParams = OID->getTypeParamListAsWritten()) {
1287     PrintObjCTypeParams(TypeParams);
1288   }
1289 
1290   if (SID)
1291     Out << " : " << QualType(OID->getSuperClassType(), 0).getAsString(Policy);
1292 
1293   // Protocols?
1294   const ObjCList<ObjCProtocolDecl> &Protocols = OID->getReferencedProtocols();
1295   if (!Protocols.empty()) {
1296     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
1297          E = Protocols.end(); I != E; ++I)
1298       Out << (I == Protocols.begin() ? '<' : ',') << **I;
1299     Out << "> ";
1300   }
1301 
1302   if (OID->ivar_size() > 0) {
1303     Out << "{\n";
1304     eolnOut = true;
1305     Indentation += Policy.Indentation;
1306     for (const auto *I : OID->ivars()) {
1307       Indent() << I->getASTContext()
1308                       .getUnqualifiedObjCPointerType(I->getType())
1309                       .getAsString(Policy) << ' ' << *I << ";\n";
1310     }
1311     Indentation -= Policy.Indentation;
1312     Out << "}\n";
1313   }
1314   else if (SID || (OID->decls_begin() != OID->decls_end())) {
1315     Out << "\n";
1316     eolnOut = true;
1317   }
1318 
1319   VisitDeclContext(OID, false);
1320   if (!eolnOut)
1321     Out << "\n";
1322   Out << "@end";
1323   // FIXME: implement the rest...
1324 }
1325 
1326 void DeclPrinter::VisitObjCProtocolDecl(ObjCProtocolDecl *PID) {
1327   if (!PID->isThisDeclarationADefinition()) {
1328     Out << "@protocol " << *PID << ";\n";
1329     return;
1330   }
1331   // Protocols?
1332   const ObjCList<ObjCProtocolDecl> &Protocols = PID->getReferencedProtocols();
1333   if (!Protocols.empty()) {
1334     Out << "@protocol " << *PID;
1335     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
1336          E = Protocols.end(); I != E; ++I)
1337       Out << (I == Protocols.begin() ? '<' : ',') << **I;
1338     Out << ">\n";
1339   } else
1340     Out << "@protocol " << *PID << '\n';
1341   VisitDeclContext(PID, false);
1342   Out << "@end";
1343 }
1344 
1345 void DeclPrinter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *PID) {
1346   Out << "@implementation " << *PID->getClassInterface() << '(' << *PID <<")\n";
1347 
1348   VisitDeclContext(PID, false);
1349   Out << "@end";
1350   // FIXME: implement the rest...
1351 }
1352 
1353 void DeclPrinter::VisitObjCCategoryDecl(ObjCCategoryDecl *PID) {
1354   Out << "@interface " << *PID->getClassInterface();
1355   if (auto TypeParams = PID->getTypeParamList()) {
1356     PrintObjCTypeParams(TypeParams);
1357   }
1358   Out << "(" << *PID << ")\n";
1359   if (PID->ivar_size() > 0) {
1360     Out << "{\n";
1361     Indentation += Policy.Indentation;
1362     for (const auto *I : PID->ivars())
1363       Indent() << I->getASTContext().getUnqualifiedObjCPointerType(I->getType()).
1364                     getAsString(Policy) << ' ' << *I << ";\n";
1365     Indentation -= Policy.Indentation;
1366     Out << "}\n";
1367   }
1368 
1369   VisitDeclContext(PID, false);
1370   Out << "@end";
1371 
1372   // FIXME: implement the rest...
1373 }
1374 
1375 void DeclPrinter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *AID) {
1376   Out << "@compatibility_alias " << *AID
1377       << ' ' << *AID->getClassInterface() << ";\n";
1378 }
1379 
1380 /// PrintObjCPropertyDecl - print a property declaration.
1381 ///
1382 void DeclPrinter::VisitObjCPropertyDecl(ObjCPropertyDecl *PDecl) {
1383   if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Required)
1384     Out << "@required\n";
1385   else if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Optional)
1386     Out << "@optional\n";
1387 
1388   QualType T = PDecl->getType();
1389 
1390   Out << "@property";
1391   if (PDecl->getPropertyAttributes() != ObjCPropertyDecl::OBJC_PR_noattr) {
1392     bool first = true;
1393     Out << " (";
1394     if (PDecl->getPropertyAttributes() &
1395         ObjCPropertyDecl::OBJC_PR_readonly) {
1396       Out << (first ? ' ' : ',') << "readonly";
1397       first = false;
1398     }
1399 
1400     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) {
1401       Out << (first ? ' ' : ',') << "getter = ";
1402       PDecl->getGetterName().print(Out);
1403       first = false;
1404     }
1405     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) {
1406       Out << (first ? ' ' : ',') << "setter = ";
1407       PDecl->getSetterName().print(Out);
1408       first = false;
1409     }
1410 
1411     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_assign) {
1412       Out << (first ? ' ' : ',') << "assign";
1413       first = false;
1414     }
1415 
1416     if (PDecl->getPropertyAttributes() &
1417         ObjCPropertyDecl::OBJC_PR_readwrite) {
1418       Out << (first ? ' ' : ',') << "readwrite";
1419       first = false;
1420     }
1421 
1422     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_retain) {
1423       Out << (first ? ' ' : ',') << "retain";
1424       first = false;
1425     }
1426 
1427     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_strong) {
1428       Out << (first ? ' ' : ',') << "strong";
1429       first = false;
1430     }
1431 
1432     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_copy) {
1433       Out << (first ? ' ' : ',') << "copy";
1434       first = false;
1435     }
1436 
1437     if (PDecl->getPropertyAttributes() &
1438         ObjCPropertyDecl::OBJC_PR_nonatomic) {
1439       Out << (first ? ' ' : ',') << "nonatomic";
1440       first = false;
1441     }
1442     if (PDecl->getPropertyAttributes() &
1443         ObjCPropertyDecl::OBJC_PR_atomic) {
1444       Out << (first ? ' ' : ',') << "atomic";
1445       first = false;
1446     }
1447 
1448     if (PDecl->getPropertyAttributes() &
1449         ObjCPropertyDecl::OBJC_PR_nullability) {
1450       if (auto nullability = AttributedType::stripOuterNullability(T)) {
1451         if (*nullability == NullabilityKind::Unspecified &&
1452             (PDecl->getPropertyAttributes() &
1453                ObjCPropertyDecl::OBJC_PR_null_resettable)) {
1454           Out << (first ? ' ' : ',') << "null_resettable";
1455         } else {
1456           Out << (first ? ' ' : ',')
1457               << getNullabilitySpelling(*nullability, true);
1458         }
1459         first = false;
1460       }
1461     }
1462 
1463     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_class) {
1464       Out << (first ? ' ' : ',') << "class";
1465       first = false;
1466     }
1467 
1468     (void) first; // Silence dead store warning due to idiomatic code.
1469     Out << " )";
1470   }
1471   Out << ' ' << PDecl->getASTContext().getUnqualifiedObjCPointerType(T).
1472                   getAsString(Policy) << ' ' << *PDecl;
1473   if (Policy.PolishForDeclaration)
1474     Out << ';';
1475 }
1476 
1477 void DeclPrinter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *PID) {
1478   if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize)
1479     Out << "@synthesize ";
1480   else
1481     Out << "@dynamic ";
1482   Out << *PID->getPropertyDecl();
1483   if (PID->getPropertyIvarDecl())
1484     Out << '=' << *PID->getPropertyIvarDecl();
1485 }
1486 
1487 void DeclPrinter::VisitUsingDecl(UsingDecl *D) {
1488   if (!D->isAccessDeclaration())
1489     Out << "using ";
1490   if (D->hasTypename())
1491     Out << "typename ";
1492   D->getQualifier()->print(Out, Policy);
1493 
1494   // Use the correct record name when the using declaration is used for
1495   // inheriting constructors.
1496   for (const auto *Shadow : D->shadows()) {
1497     if (const auto *ConstructorShadow =
1498             dyn_cast<ConstructorUsingShadowDecl>(Shadow)) {
1499       assert(Shadow->getDeclContext() == ConstructorShadow->getDeclContext());
1500       Out << *ConstructorShadow->getNominatedBaseClass();
1501       return;
1502     }
1503   }
1504   Out << *D;
1505 }
1506 
1507 void
1508 DeclPrinter::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) {
1509   Out << "using typename ";
1510   D->getQualifier()->print(Out, Policy);
1511   Out << D->getDeclName();
1512 }
1513 
1514 void DeclPrinter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1515   if (!D->isAccessDeclaration())
1516     Out << "using ";
1517   D->getQualifier()->print(Out, Policy);
1518   Out << D->getDeclName();
1519 }
1520 
1521 void DeclPrinter::VisitUsingShadowDecl(UsingShadowDecl *D) {
1522   // ignore
1523 }
1524 
1525 void DeclPrinter::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
1526   Out << "#pragma omp threadprivate";
1527   if (!D->varlist_empty()) {
1528     for (OMPThreadPrivateDecl::varlist_iterator I = D->varlist_begin(),
1529                                                 E = D->varlist_end();
1530                                                 I != E; ++I) {
1531       Out << (I == D->varlist_begin() ? '(' : ',');
1532       NamedDecl *ND = cast<DeclRefExpr>(*I)->getDecl();
1533       ND->printQualifiedName(Out);
1534     }
1535     Out << ")";
1536   }
1537 }
1538 
1539 void DeclPrinter::VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D) {
1540   if (!D->isInvalidDecl()) {
1541     Out << "#pragma omp declare reduction (";
1542     if (D->getDeclName().getNameKind() == DeclarationName::CXXOperatorName) {
1543       static const char *const OperatorNames[NUM_OVERLOADED_OPERATORS] = {
1544           nullptr,
1545 #define OVERLOADED_OPERATOR(Name, Spelling, Token, Unary, Binary, MemberOnly)  \
1546           Spelling,
1547 #include "clang/Basic/OperatorKinds.def"
1548       };
1549       const char *OpName =
1550           OperatorNames[D->getDeclName().getCXXOverloadedOperator()];
1551       assert(OpName && "not an overloaded operator");
1552       Out << OpName;
1553     } else {
1554       assert(D->getDeclName().isIdentifier());
1555       D->printName(Out);
1556     }
1557     Out << " : ";
1558     D->getType().print(Out, Policy);
1559     Out << " : ";
1560     D->getCombiner()->printPretty(Out, nullptr, Policy, 0);
1561     Out << ")";
1562     if (auto *Init = D->getInitializer()) {
1563       Out << " initializer(";
1564       switch (D->getInitializerKind()) {
1565       case OMPDeclareReductionDecl::DirectInit:
1566         Out << "omp_priv(";
1567         break;
1568       case OMPDeclareReductionDecl::CopyInit:
1569         Out << "omp_priv = ";
1570         break;
1571       case OMPDeclareReductionDecl::CallInit:
1572         break;
1573       }
1574       Init->printPretty(Out, nullptr, Policy, 0);
1575       if (D->getInitializerKind() == OMPDeclareReductionDecl::DirectInit)
1576         Out << ")";
1577       Out << ")";
1578     }
1579   }
1580 }
1581 
1582 void DeclPrinter::VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D) {
1583   D->getInit()->printPretty(Out, nullptr, Policy, Indentation);
1584 }
1585 
1586