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