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 
482   CXXConstructorDecl *CDecl = dyn_cast<CXXConstructorDecl>(D);
483   CXXConversionDecl *ConversionDecl = dyn_cast<CXXConversionDecl>(D);
484   CXXDeductionGuideDecl *GuideDecl = dyn_cast<CXXDeductionGuideDecl>(D);
485   if (!Policy.SuppressSpecifiers) {
486     switch (D->getStorageClass()) {
487     case SC_None: break;
488     case SC_Extern: Out << "extern "; break;
489     case SC_Static: Out << "static "; break;
490     case SC_PrivateExtern: Out << "__private_extern__ "; break;
491     case SC_Auto: case SC_Register:
492       llvm_unreachable("invalid for functions");
493     }
494 
495     if (D->isInlineSpecified())  Out << "inline ";
496     if (D->isVirtualAsWritten()) Out << "virtual ";
497     if (D->isModulePrivate())    Out << "__module_private__ ";
498     if (D->isConstexpr() && !D->isExplicitlyDefaulted()) Out << "constexpr ";
499     if ((CDecl && CDecl->isExplicitSpecified()) ||
500         (ConversionDecl && ConversionDecl->isExplicitSpecified()) ||
501         (GuideDecl && GuideDecl->isExplicitSpecified()))
502       Out << "explicit ";
503   }
504 
505   PrintingPolicy SubPolicy(Policy);
506   SubPolicy.SuppressSpecifiers = false;
507   std::string Proto = D->getNameInfo().getAsString();
508   if (GuideDecl)
509     Proto = GuideDecl->getDeducedTemplate()->getDeclName().getAsString();
510   if (const TemplateArgumentList *TArgs = D->getTemplateSpecializationArgs()) {
511     llvm::raw_string_ostream POut(Proto);
512     DeclPrinter TArgPrinter(POut, SubPolicy, Indentation);
513     TArgPrinter.printTemplateArguments(*TArgs);
514   }
515 
516   QualType Ty = D->getType();
517   while (const ParenType *PT = dyn_cast<ParenType>(Ty)) {
518     Proto = '(' + Proto + ')';
519     Ty = PT->getInnerType();
520   }
521 
522   if (const FunctionType *AFT = Ty->getAs<FunctionType>()) {
523     const FunctionProtoType *FT = nullptr;
524     if (D->hasWrittenPrototype())
525       FT = dyn_cast<FunctionProtoType>(AFT);
526 
527     Proto += "(";
528     if (FT) {
529       llvm::raw_string_ostream POut(Proto);
530       DeclPrinter ParamPrinter(POut, SubPolicy, Indentation);
531       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
532         if (i) POut << ", ";
533         ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
534       }
535 
536       if (FT->isVariadic()) {
537         if (D->getNumParams()) POut << ", ";
538         POut << "...";
539       }
540     } else if (D->doesThisDeclarationHaveABody() && !D->hasPrototype()) {
541       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
542         if (i)
543           Proto += ", ";
544         Proto += D->getParamDecl(i)->getNameAsString();
545       }
546     }
547 
548     Proto += ")";
549 
550     if (FT) {
551       if (FT->isConst())
552         Proto += " const";
553       if (FT->isVolatile())
554         Proto += " volatile";
555       if (FT->isRestrict())
556         Proto += " restrict";
557 
558       switch (FT->getRefQualifier()) {
559       case RQ_None:
560         break;
561       case RQ_LValue:
562         Proto += " &";
563         break;
564       case RQ_RValue:
565         Proto += " &&";
566         break;
567       }
568     }
569 
570     if (FT && FT->hasDynamicExceptionSpec()) {
571       Proto += " throw(";
572       if (FT->getExceptionSpecType() == EST_MSAny)
573         Proto += "...";
574       else
575         for (unsigned I = 0, N = FT->getNumExceptions(); I != N; ++I) {
576           if (I)
577             Proto += ", ";
578 
579           Proto += FT->getExceptionType(I).getAsString(SubPolicy);
580         }
581       Proto += ")";
582     } else if (FT && isNoexceptExceptionSpec(FT->getExceptionSpecType())) {
583       Proto += " noexcept";
584       if (FT->getExceptionSpecType() == EST_ComputedNoexcept) {
585         Proto += "(";
586         llvm::raw_string_ostream EOut(Proto);
587         FT->getNoexceptExpr()->printPretty(EOut, nullptr, SubPolicy,
588                                            Indentation);
589         EOut.flush();
590         Proto += EOut.str();
591         Proto += ")";
592       }
593     }
594 
595     if (CDecl) {
596       bool HasInitializerList = false;
597       for (const auto *BMInitializer : CDecl->inits()) {
598         if (BMInitializer->isInClassMemberInitializer())
599           continue;
600 
601         if (!HasInitializerList) {
602           Proto += " : ";
603           Out << Proto;
604           Proto.clear();
605           HasInitializerList = true;
606         } else
607           Out << ", ";
608 
609         if (BMInitializer->isAnyMemberInitializer()) {
610           FieldDecl *FD = BMInitializer->getAnyMember();
611           Out << *FD;
612         } else {
613           Out << QualType(BMInitializer->getBaseClass(), 0).getAsString(Policy);
614         }
615 
616         Out << "(";
617         if (!BMInitializer->getInit()) {
618           // Nothing to print
619         } else {
620           Expr *Init = BMInitializer->getInit();
621           if (ExprWithCleanups *Tmp = dyn_cast<ExprWithCleanups>(Init))
622             Init = Tmp->getSubExpr();
623 
624           Init = Init->IgnoreParens();
625 
626           Expr *SimpleInit = nullptr;
627           Expr **Args = nullptr;
628           unsigned NumArgs = 0;
629           if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
630             Args = ParenList->getExprs();
631             NumArgs = ParenList->getNumExprs();
632           } else if (CXXConstructExpr *Construct
633                                         = dyn_cast<CXXConstructExpr>(Init)) {
634             Args = Construct->getArgs();
635             NumArgs = Construct->getNumArgs();
636           } else
637             SimpleInit = Init;
638 
639           if (SimpleInit)
640             SimpleInit->printPretty(Out, nullptr, Policy, Indentation);
641           else {
642             for (unsigned I = 0; I != NumArgs; ++I) {
643               assert(Args[I] != nullptr && "Expected non-null Expr");
644               if (isa<CXXDefaultArgExpr>(Args[I]))
645                 break;
646 
647               if (I)
648                 Out << ", ";
649               Args[I]->printPretty(Out, nullptr, Policy, Indentation);
650             }
651           }
652         }
653         Out << ")";
654         if (BMInitializer->isPackExpansion())
655           Out << "...";
656       }
657     } else if (!ConversionDecl && !isa<CXXDestructorDecl>(D)) {
658       if (FT && FT->hasTrailingReturn()) {
659         if (!GuideDecl)
660           Out << "auto ";
661         Out << Proto << " -> ";
662         Proto.clear();
663       }
664       AFT->getReturnType().print(Out, Policy, Proto);
665       Proto.clear();
666     }
667     Out << Proto;
668   } else {
669     Ty.print(Out, Policy, Proto);
670   }
671 
672   prettyPrintAttributes(D);
673 
674   if (D->isPure())
675     Out << " = 0";
676   else if (D->isDeletedAsWritten())
677     Out << " = delete";
678   else if (D->isExplicitlyDefaulted())
679     Out << " = default";
680   else if (D->doesThisDeclarationHaveABody()) {
681     if (!Policy.TerseOutput) {
682       if (!D->hasPrototype() && D->getNumParams()) {
683         // This is a K&R function definition, so we need to print the
684         // parameters.
685         Out << '\n';
686         DeclPrinter ParamPrinter(Out, SubPolicy, Indentation);
687         Indentation += Policy.Indentation;
688         for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
689           Indent();
690           ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
691           Out << ";\n";
692         }
693         Indentation -= Policy.Indentation;
694       } else
695         Out << ' ';
696 
697       if (D->getBody())
698         D->getBody()->printPretty(Out, nullptr, SubPolicy, Indentation);
699     } else {
700       if (isa<CXXConstructorDecl>(*D))
701         Out << " {}";
702     }
703   }
704 }
705 
706 void DeclPrinter::VisitFriendDecl(FriendDecl *D) {
707   if (TypeSourceInfo *TSI = D->getFriendType()) {
708     unsigned NumTPLists = D->getFriendTypeNumTemplateParameterLists();
709     for (unsigned i = 0; i < NumTPLists; ++i)
710       printTemplateParameters(D->getFriendTypeTemplateParameterList(i));
711     Out << "friend ";
712     Out << " " << TSI->getType().getAsString(Policy);
713   }
714   else if (FunctionDecl *FD =
715       dyn_cast<FunctionDecl>(D->getFriendDecl())) {
716     Out << "friend ";
717     VisitFunctionDecl(FD);
718   }
719   else if (FunctionTemplateDecl *FTD =
720            dyn_cast<FunctionTemplateDecl>(D->getFriendDecl())) {
721     Out << "friend ";
722     VisitFunctionTemplateDecl(FTD);
723   }
724   else if (ClassTemplateDecl *CTD =
725            dyn_cast<ClassTemplateDecl>(D->getFriendDecl())) {
726     Out << "friend ";
727     VisitRedeclarableTemplateDecl(CTD);
728   }
729 }
730 
731 void DeclPrinter::VisitFieldDecl(FieldDecl *D) {
732   // FIXME: add printing of pragma attributes if required.
733   if (!Policy.SuppressSpecifiers && D->isMutable())
734     Out << "mutable ";
735   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
736     Out << "__module_private__ ";
737 
738   Out << D->getASTContext().getUnqualifiedObjCPointerType(D->getType()).
739          stream(Policy, D->getName(), Indentation);
740 
741   if (D->isBitField()) {
742     Out << " : ";
743     D->getBitWidth()->printPretty(Out, nullptr, Policy, Indentation);
744   }
745 
746   Expr *Init = D->getInClassInitializer();
747   if (!Policy.SuppressInitializers && Init) {
748     if (D->getInClassInitStyle() == ICIS_ListInit)
749       Out << " ";
750     else
751       Out << " = ";
752     Init->printPretty(Out, nullptr, Policy, Indentation);
753   }
754   prettyPrintAttributes(D);
755 }
756 
757 void DeclPrinter::VisitLabelDecl(LabelDecl *D) {
758   Out << *D << ":";
759 }
760 
761 void DeclPrinter::VisitVarDecl(VarDecl *D) {
762   prettyPrintPragmas(D);
763 
764   QualType T = D->getTypeSourceInfo()
765     ? D->getTypeSourceInfo()->getType()
766     : D->getASTContext().getUnqualifiedObjCPointerType(D->getType());
767 
768   if (!Policy.SuppressSpecifiers) {
769     StorageClass SC = D->getStorageClass();
770     if (SC != SC_None)
771       Out << VarDecl::getStorageClassSpecifierString(SC) << " ";
772 
773     switch (D->getTSCSpec()) {
774     case TSCS_unspecified:
775       break;
776     case TSCS___thread:
777       Out << "__thread ";
778       break;
779     case TSCS__Thread_local:
780       Out << "_Thread_local ";
781       break;
782     case TSCS_thread_local:
783       Out << "thread_local ";
784       break;
785     }
786 
787     if (D->isModulePrivate())
788       Out << "__module_private__ ";
789 
790     if (D->isConstexpr()) {
791       Out << "constexpr ";
792       T.removeLocalConst();
793     }
794   }
795 
796   printDeclType(T, D->getName());
797   Expr *Init = D->getInit();
798   if (!Policy.SuppressInitializers && Init) {
799     bool ImplicitInit = false;
800     if (CXXConstructExpr *Construct =
801             dyn_cast<CXXConstructExpr>(Init->IgnoreImplicit())) {
802       if (D->getInitStyle() == VarDecl::CallInit &&
803           !Construct->isListInitialization()) {
804         ImplicitInit = Construct->getNumArgs() == 0 ||
805           Construct->getArg(0)->isDefaultArgument();
806       }
807     }
808     if (!ImplicitInit) {
809       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
810         Out << "(";
811       else if (D->getInitStyle() == VarDecl::CInit) {
812         Out << " = ";
813       }
814       PrintingPolicy SubPolicy(Policy);
815       SubPolicy.SuppressSpecifiers = false;
816       SubPolicy.IncludeTagDefinition = false;
817       Init->printPretty(Out, nullptr, SubPolicy, Indentation);
818       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
819         Out << ")";
820     }
821   }
822   prettyPrintAttributes(D);
823 }
824 
825 void DeclPrinter::VisitParmVarDecl(ParmVarDecl *D) {
826   VisitVarDecl(D);
827 }
828 
829 void DeclPrinter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
830   Out << "__asm (";
831   D->getAsmString()->printPretty(Out, nullptr, Policy, Indentation);
832   Out << ")";
833 }
834 
835 void DeclPrinter::VisitImportDecl(ImportDecl *D) {
836   Out << "@import " << D->getImportedModule()->getFullModuleName()
837       << ";\n";
838 }
839 
840 void DeclPrinter::VisitStaticAssertDecl(StaticAssertDecl *D) {
841   Out << "static_assert(";
842   D->getAssertExpr()->printPretty(Out, nullptr, Policy, Indentation);
843   if (StringLiteral *SL = D->getMessage()) {
844     Out << ", ";
845     SL->printPretty(Out, nullptr, Policy, Indentation);
846   }
847   Out << ")";
848 }
849 
850 //----------------------------------------------------------------------------
851 // C++ declarations
852 //----------------------------------------------------------------------------
853 void DeclPrinter::VisitNamespaceDecl(NamespaceDecl *D) {
854   if (D->isInline())
855     Out << "inline ";
856   Out << "namespace " << *D << " {\n";
857   VisitDeclContext(D);
858   Indent() << "}";
859 }
860 
861 void DeclPrinter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
862   Out << "using namespace ";
863   if (D->getQualifier())
864     D->getQualifier()->print(Out, Policy);
865   Out << *D->getNominatedNamespaceAsWritten();
866 }
867 
868 void DeclPrinter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
869   Out << "namespace " << *D << " = ";
870   if (D->getQualifier())
871     D->getQualifier()->print(Out, Policy);
872   Out << *D->getAliasedNamespace();
873 }
874 
875 void DeclPrinter::VisitEmptyDecl(EmptyDecl *D) {
876   prettyPrintAttributes(D);
877 }
878 
879 void DeclPrinter::VisitCXXRecordDecl(CXXRecordDecl *D) {
880   // FIXME: add printing of pragma attributes if required.
881   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
882     Out << "__module_private__ ";
883   Out << D->getKindName();
884 
885   prettyPrintAttributes(D);
886 
887   if (D->getIdentifier()) {
888     Out << ' ' << *D;
889 
890     if (auto S = dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
891       printTemplateArguments(S->getTemplateArgs(), S->getTemplateParameters());
892     else if (auto S = dyn_cast<ClassTemplateSpecializationDecl>(D))
893       printTemplateArguments(S->getTemplateArgs());
894   }
895 
896   if (D->isCompleteDefinition()) {
897     // Print the base classes
898     if (D->getNumBases()) {
899       Out << " : ";
900       for (CXXRecordDecl::base_class_iterator Base = D->bases_begin(),
901              BaseEnd = D->bases_end(); Base != BaseEnd; ++Base) {
902         if (Base != D->bases_begin())
903           Out << ", ";
904 
905         if (Base->isVirtual())
906           Out << "virtual ";
907 
908         AccessSpecifier AS = Base->getAccessSpecifierAsWritten();
909         if (AS != AS_none) {
910           Print(AS);
911           Out << " ";
912         }
913         Out << Base->getType().getAsString(Policy);
914 
915         if (Base->isPackExpansion())
916           Out << "...";
917       }
918     }
919 
920     // Print the class definition
921     // FIXME: Doesn't print access specifiers, e.g., "public:"
922     if (Policy.TerseOutput) {
923       Out << " {}";
924     } else {
925       Out << " {\n";
926       VisitDeclContext(D);
927       Indent() << "}";
928     }
929   }
930 }
931 
932 void DeclPrinter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
933   const char *l;
934   if (D->getLanguage() == LinkageSpecDecl::lang_c)
935     l = "C";
936   else {
937     assert(D->getLanguage() == LinkageSpecDecl::lang_cxx &&
938            "unknown language in linkage specification");
939     l = "C++";
940   }
941 
942   Out << "extern \"" << l << "\" ";
943   if (D->hasBraces()) {
944     Out << "{\n";
945     VisitDeclContext(D);
946     Indent() << "}";
947   } else
948     Visit(*D->decls_begin());
949 }
950 
951 void DeclPrinter::printTemplateParameters(const TemplateParameterList *Params) {
952   assert(Params);
953 
954   Out << "template <";
955 
956   for (unsigned i = 0, e = Params->size(); i != e; ++i) {
957     if (i != 0)
958       Out << ", ";
959 
960     const Decl *Param = Params->getParam(i);
961     if (auto TTP = dyn_cast<TemplateTypeParmDecl>(Param)) {
962 
963       if (TTP->wasDeclaredWithTypename())
964         Out << "typename ";
965       else
966         Out << "class ";
967 
968       if (TTP->isParameterPack())
969         Out << "...";
970 
971       Out << *TTP;
972 
973       if (TTP->hasDefaultArgument()) {
974         Out << " = ";
975         Out << TTP->getDefaultArgument().getAsString(Policy);
976       };
977     } else if (auto NTTP = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
978       StringRef Name;
979       if (IdentifierInfo *II = NTTP->getIdentifier())
980         Name = II->getName();
981       printDeclType(NTTP->getType(), Name, NTTP->isParameterPack());
982 
983       if (NTTP->hasDefaultArgument()) {
984         Out << " = ";
985         NTTP->getDefaultArgument()->printPretty(Out, nullptr, Policy,
986                                                 Indentation);
987       }
988     } else if (auto TTPD = dyn_cast<TemplateTemplateParmDecl>(Param)) {
989       VisitTemplateDecl(TTPD);
990       // FIXME: print the default argument, if present.
991     }
992   }
993 
994   Out << "> ";
995 }
996 
997 void DeclPrinter::printTemplateArguments(const TemplateArgumentList &Args,
998                                          const TemplateParameterList *Params) {
999   Out << "<";
1000   for (size_t I = 0, E = Args.size(); I < E; ++I) {
1001     const TemplateArgument &A = Args[I];
1002     if (I)
1003       Out << ", ";
1004     if (Params) {
1005       if (A.getKind() == TemplateArgument::Type)
1006         if (auto T = A.getAsType()->getAs<TemplateTypeParmType>()) {
1007           auto P = cast<TemplateTypeParmDecl>(Params->getParam(T->getIndex()));
1008           Out << *P;
1009           continue;
1010         }
1011       if (A.getKind() == TemplateArgument::Template) {
1012         if (auto T = A.getAsTemplate().getAsTemplateDecl())
1013           if (auto TD = dyn_cast<TemplateTemplateParmDecl>(T)) {
1014             auto P = cast<TemplateTemplateParmDecl>(
1015                                               Params->getParam(TD->getIndex()));
1016             Out << *P;
1017             continue;
1018           }
1019       }
1020       if (A.getKind() == TemplateArgument::Expression) {
1021         if (auto E = dyn_cast<DeclRefExpr>(A.getAsExpr()))
1022           if (auto N = dyn_cast<NonTypeTemplateParmDecl>(E->getDecl())) {
1023             auto P = cast<NonTypeTemplateParmDecl>(
1024                                                Params->getParam(N->getIndex()));
1025             Out << *P;
1026             continue;
1027           }
1028       }
1029     }
1030     A.print(Policy, Out);
1031   }
1032   Out << ">";
1033 }
1034 
1035 void DeclPrinter::VisitTemplateDecl(const TemplateDecl *D) {
1036   printTemplateParameters(D->getTemplateParameters());
1037 
1038   if (const TemplateTemplateParmDecl *TTP =
1039         dyn_cast<TemplateTemplateParmDecl>(D)) {
1040     Out << "class ";
1041     if (TTP->isParameterPack())
1042       Out << "...";
1043     Out << D->getName();
1044   } else {
1045     Visit(D->getTemplatedDecl());
1046   }
1047 }
1048 
1049 void DeclPrinter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1050   prettyPrintPragmas(D->getTemplatedDecl());
1051   VisitRedeclarableTemplateDecl(D);
1052 
1053   // Never print "instantiations" for deduction guides (they don't really
1054   // have them).
1055   if (PrintInstantiation &&
1056       !isa<CXXDeductionGuideDecl>(D->getTemplatedDecl())) {
1057     FunctionDecl *PrevDecl = D->getTemplatedDecl();
1058     const FunctionDecl *Def;
1059     if (PrevDecl->isDefined(Def) && Def != PrevDecl)
1060       return;
1061     for (auto *I : D->specializations())
1062       if (I->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) {
1063         if (!PrevDecl->isThisDeclarationADefinition())
1064           Out << ";\n";
1065         Indent();
1066         prettyPrintPragmas(I);
1067         Visit(I);
1068       }
1069   }
1070 }
1071 
1072 void DeclPrinter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1073   VisitRedeclarableTemplateDecl(D);
1074 
1075   if (PrintInstantiation) {
1076     for (auto *I : D->specializations())
1077       if (I->getSpecializationKind() == TSK_ImplicitInstantiation) {
1078         if (D->isThisDeclarationADefinition())
1079           Out << ";";
1080         Out << "\n";
1081         Visit(I);
1082       }
1083   }
1084 }
1085 
1086 void DeclPrinter::VisitClassTemplateSpecializationDecl(
1087                                            ClassTemplateSpecializationDecl *D) {
1088   Out << "template<> ";
1089   VisitCXXRecordDecl(D);
1090 }
1091 
1092 void DeclPrinter::VisitClassTemplatePartialSpecializationDecl(
1093                                     ClassTemplatePartialSpecializationDecl *D) {
1094   printTemplateParameters(D->getTemplateParameters());
1095   VisitCXXRecordDecl(D);
1096 }
1097 
1098 //----------------------------------------------------------------------------
1099 // Objective-C declarations
1100 //----------------------------------------------------------------------------
1101 
1102 void DeclPrinter::PrintObjCMethodType(ASTContext &Ctx,
1103                                       Decl::ObjCDeclQualifier Quals,
1104                                       QualType T) {
1105   Out << '(';
1106   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_In)
1107     Out << "in ";
1108   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Inout)
1109     Out << "inout ";
1110   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Out)
1111     Out << "out ";
1112   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Bycopy)
1113     Out << "bycopy ";
1114   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Byref)
1115     Out << "byref ";
1116   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Oneway)
1117     Out << "oneway ";
1118   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_CSNullability) {
1119     if (auto nullability = AttributedType::stripOuterNullability(T))
1120       Out << getNullabilitySpelling(*nullability, true) << ' ';
1121   }
1122 
1123   Out << Ctx.getUnqualifiedObjCPointerType(T).getAsString(Policy);
1124   Out << ')';
1125 }
1126 
1127 void DeclPrinter::PrintObjCTypeParams(ObjCTypeParamList *Params) {
1128   Out << "<";
1129   unsigned First = true;
1130   for (auto *Param : *Params) {
1131     if (First) {
1132       First = false;
1133     } else {
1134       Out << ", ";
1135     }
1136 
1137     switch (Param->getVariance()) {
1138     case ObjCTypeParamVariance::Invariant:
1139       break;
1140 
1141     case ObjCTypeParamVariance::Covariant:
1142       Out << "__covariant ";
1143       break;
1144 
1145     case ObjCTypeParamVariance::Contravariant:
1146       Out << "__contravariant ";
1147       break;
1148     }
1149 
1150     Out << Param->getDeclName().getAsString();
1151 
1152     if (Param->hasExplicitBound()) {
1153       Out << " : " << Param->getUnderlyingType().getAsString(Policy);
1154     }
1155   }
1156   Out << ">";
1157 }
1158 
1159 void DeclPrinter::VisitObjCMethodDecl(ObjCMethodDecl *OMD) {
1160   if (OMD->isInstanceMethod())
1161     Out << "- ";
1162   else
1163     Out << "+ ";
1164   if (!OMD->getReturnType().isNull()) {
1165     PrintObjCMethodType(OMD->getASTContext(), OMD->getObjCDeclQualifier(),
1166                         OMD->getReturnType());
1167   }
1168 
1169   std::string name = OMD->getSelector().getAsString();
1170   std::string::size_type pos, lastPos = 0;
1171   for (const auto *PI : OMD->parameters()) {
1172     // FIXME: selector is missing here!
1173     pos = name.find_first_of(':', lastPos);
1174     Out << " " << name.substr(lastPos, pos - lastPos) << ':';
1175     PrintObjCMethodType(OMD->getASTContext(),
1176                         PI->getObjCDeclQualifier(),
1177                         PI->getType());
1178     Out << *PI;
1179     lastPos = pos + 1;
1180   }
1181 
1182   if (OMD->param_begin() == OMD->param_end())
1183     Out << " " << name;
1184 
1185   if (OMD->isVariadic())
1186       Out << ", ...";
1187 
1188   prettyPrintAttributes(OMD);
1189 
1190   if (OMD->getBody() && !Policy.TerseOutput) {
1191     Out << ' ';
1192     OMD->getBody()->printPretty(Out, nullptr, Policy);
1193   }
1194   else if (Policy.PolishForDeclaration)
1195     Out << ';';
1196 }
1197 
1198 void DeclPrinter::VisitObjCImplementationDecl(ObjCImplementationDecl *OID) {
1199   std::string I = OID->getNameAsString();
1200   ObjCInterfaceDecl *SID = OID->getSuperClass();
1201 
1202   bool eolnOut = false;
1203   if (SID)
1204     Out << "@implementation " << I << " : " << *SID;
1205   else
1206     Out << "@implementation " << I;
1207 
1208   if (OID->ivar_size() > 0) {
1209     Out << "{\n";
1210     eolnOut = true;
1211     Indentation += Policy.Indentation;
1212     for (const auto *I : OID->ivars()) {
1213       Indent() << I->getASTContext().getUnqualifiedObjCPointerType(I->getType()).
1214                     getAsString(Policy) << ' ' << *I << ";\n";
1215     }
1216     Indentation -= Policy.Indentation;
1217     Out << "}\n";
1218   }
1219   else if (SID || (OID->decls_begin() != OID->decls_end())) {
1220     Out << "\n";
1221     eolnOut = true;
1222   }
1223   VisitDeclContext(OID, false);
1224   if (!eolnOut)
1225     Out << "\n";
1226   Out << "@end";
1227 }
1228 
1229 void DeclPrinter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *OID) {
1230   std::string I = OID->getNameAsString();
1231   ObjCInterfaceDecl *SID = OID->getSuperClass();
1232 
1233   if (!OID->isThisDeclarationADefinition()) {
1234     Out << "@class " << I;
1235 
1236     if (auto TypeParams = OID->getTypeParamListAsWritten()) {
1237       PrintObjCTypeParams(TypeParams);
1238     }
1239 
1240     Out << ";";
1241     return;
1242   }
1243   bool eolnOut = false;
1244   Out << "@interface " << I;
1245 
1246   if (auto TypeParams = OID->getTypeParamListAsWritten()) {
1247     PrintObjCTypeParams(TypeParams);
1248   }
1249 
1250   if (SID)
1251     Out << " : " << QualType(OID->getSuperClassType(), 0).getAsString(Policy);
1252 
1253   // Protocols?
1254   const ObjCList<ObjCProtocolDecl> &Protocols = OID->getReferencedProtocols();
1255   if (!Protocols.empty()) {
1256     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
1257          E = Protocols.end(); I != E; ++I)
1258       Out << (I == Protocols.begin() ? '<' : ',') << **I;
1259     Out << "> ";
1260   }
1261 
1262   if (OID->ivar_size() > 0) {
1263     Out << "{\n";
1264     eolnOut = true;
1265     Indentation += Policy.Indentation;
1266     for (const auto *I : OID->ivars()) {
1267       Indent() << I->getASTContext()
1268                       .getUnqualifiedObjCPointerType(I->getType())
1269                       .getAsString(Policy) << ' ' << *I << ";\n";
1270     }
1271     Indentation -= Policy.Indentation;
1272     Out << "}\n";
1273   }
1274   else if (SID || (OID->decls_begin() != OID->decls_end())) {
1275     Out << "\n";
1276     eolnOut = true;
1277   }
1278 
1279   VisitDeclContext(OID, false);
1280   if (!eolnOut)
1281     Out << "\n";
1282   Out << "@end";
1283   // FIXME: implement the rest...
1284 }
1285 
1286 void DeclPrinter::VisitObjCProtocolDecl(ObjCProtocolDecl *PID) {
1287   if (!PID->isThisDeclarationADefinition()) {
1288     Out << "@protocol " << *PID << ";\n";
1289     return;
1290   }
1291   // Protocols?
1292   const ObjCList<ObjCProtocolDecl> &Protocols = PID->getReferencedProtocols();
1293   if (!Protocols.empty()) {
1294     Out << "@protocol " << *PID;
1295     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
1296          E = Protocols.end(); I != E; ++I)
1297       Out << (I == Protocols.begin() ? '<' : ',') << **I;
1298     Out << ">\n";
1299   } else
1300     Out << "@protocol " << *PID << '\n';
1301   VisitDeclContext(PID, false);
1302   Out << "@end";
1303 }
1304 
1305 void DeclPrinter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *PID) {
1306   Out << "@implementation " << *PID->getClassInterface() << '(' << *PID <<")\n";
1307 
1308   VisitDeclContext(PID, false);
1309   Out << "@end";
1310   // FIXME: implement the rest...
1311 }
1312 
1313 void DeclPrinter::VisitObjCCategoryDecl(ObjCCategoryDecl *PID) {
1314   Out << "@interface " << *PID->getClassInterface();
1315   if (auto TypeParams = PID->getTypeParamList()) {
1316     PrintObjCTypeParams(TypeParams);
1317   }
1318   Out << "(" << *PID << ")\n";
1319   if (PID->ivar_size() > 0) {
1320     Out << "{\n";
1321     Indentation += Policy.Indentation;
1322     for (const auto *I : PID->ivars())
1323       Indent() << I->getASTContext().getUnqualifiedObjCPointerType(I->getType()).
1324                     getAsString(Policy) << ' ' << *I << ";\n";
1325     Indentation -= Policy.Indentation;
1326     Out << "}\n";
1327   }
1328 
1329   VisitDeclContext(PID, false);
1330   Out << "@end";
1331 
1332   // FIXME: implement the rest...
1333 }
1334 
1335 void DeclPrinter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *AID) {
1336   Out << "@compatibility_alias " << *AID
1337       << ' ' << *AID->getClassInterface() << ";\n";
1338 }
1339 
1340 /// PrintObjCPropertyDecl - print a property declaration.
1341 ///
1342 void DeclPrinter::VisitObjCPropertyDecl(ObjCPropertyDecl *PDecl) {
1343   if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Required)
1344     Out << "@required\n";
1345   else if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Optional)
1346     Out << "@optional\n";
1347 
1348   QualType T = PDecl->getType();
1349 
1350   Out << "@property";
1351   if (PDecl->getPropertyAttributes() != ObjCPropertyDecl::OBJC_PR_noattr) {
1352     bool first = true;
1353     Out << " (";
1354     if (PDecl->getPropertyAttributes() &
1355         ObjCPropertyDecl::OBJC_PR_readonly) {
1356       Out << (first ? ' ' : ',') << "readonly";
1357       first = false;
1358     }
1359 
1360     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) {
1361       Out << (first ? ' ' : ',') << "getter = ";
1362       PDecl->getGetterName().print(Out);
1363       first = false;
1364     }
1365     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) {
1366       Out << (first ? ' ' : ',') << "setter = ";
1367       PDecl->getSetterName().print(Out);
1368       first = false;
1369     }
1370 
1371     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_assign) {
1372       Out << (first ? ' ' : ',') << "assign";
1373       first = false;
1374     }
1375 
1376     if (PDecl->getPropertyAttributes() &
1377         ObjCPropertyDecl::OBJC_PR_readwrite) {
1378       Out << (first ? ' ' : ',') << "readwrite";
1379       first = false;
1380     }
1381 
1382     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_retain) {
1383       Out << (first ? ' ' : ',') << "retain";
1384       first = false;
1385     }
1386 
1387     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_strong) {
1388       Out << (first ? ' ' : ',') << "strong";
1389       first = false;
1390     }
1391 
1392     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_copy) {
1393       Out << (first ? ' ' : ',') << "copy";
1394       first = false;
1395     }
1396 
1397     if (PDecl->getPropertyAttributes() &
1398         ObjCPropertyDecl::OBJC_PR_nonatomic) {
1399       Out << (first ? ' ' : ',') << "nonatomic";
1400       first = false;
1401     }
1402     if (PDecl->getPropertyAttributes() &
1403         ObjCPropertyDecl::OBJC_PR_atomic) {
1404       Out << (first ? ' ' : ',') << "atomic";
1405       first = false;
1406     }
1407 
1408     if (PDecl->getPropertyAttributes() &
1409         ObjCPropertyDecl::OBJC_PR_nullability) {
1410       if (auto nullability = AttributedType::stripOuterNullability(T)) {
1411         if (*nullability == NullabilityKind::Unspecified &&
1412             (PDecl->getPropertyAttributes() &
1413                ObjCPropertyDecl::OBJC_PR_null_resettable)) {
1414           Out << (first ? ' ' : ',') << "null_resettable";
1415         } else {
1416           Out << (first ? ' ' : ',')
1417               << getNullabilitySpelling(*nullability, true);
1418         }
1419         first = false;
1420       }
1421     }
1422 
1423     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_class) {
1424       Out << (first ? ' ' : ',') << "class";
1425       first = false;
1426     }
1427 
1428     (void) first; // Silence dead store warning due to idiomatic code.
1429     Out << " )";
1430   }
1431   Out << ' ' << PDecl->getASTContext().getUnqualifiedObjCPointerType(T).
1432                   getAsString(Policy) << ' ' << *PDecl;
1433   if (Policy.PolishForDeclaration)
1434     Out << ';';
1435 }
1436 
1437 void DeclPrinter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *PID) {
1438   if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize)
1439     Out << "@synthesize ";
1440   else
1441     Out << "@dynamic ";
1442   Out << *PID->getPropertyDecl();
1443   if (PID->getPropertyIvarDecl())
1444     Out << '=' << *PID->getPropertyIvarDecl();
1445 }
1446 
1447 void DeclPrinter::VisitUsingDecl(UsingDecl *D) {
1448   if (!D->isAccessDeclaration())
1449     Out << "using ";
1450   if (D->hasTypename())
1451     Out << "typename ";
1452   D->getQualifier()->print(Out, Policy);
1453 
1454   // Use the correct record name when the using declaration is used for
1455   // inheriting constructors.
1456   for (const auto *Shadow : D->shadows()) {
1457     if (const auto *ConstructorShadow =
1458             dyn_cast<ConstructorUsingShadowDecl>(Shadow)) {
1459       assert(Shadow->getDeclContext() == ConstructorShadow->getDeclContext());
1460       Out << *ConstructorShadow->getNominatedBaseClass();
1461       return;
1462     }
1463   }
1464   Out << *D;
1465 }
1466 
1467 void
1468 DeclPrinter::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) {
1469   Out << "using typename ";
1470   D->getQualifier()->print(Out, Policy);
1471   Out << D->getDeclName();
1472 }
1473 
1474 void DeclPrinter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1475   if (!D->isAccessDeclaration())
1476     Out << "using ";
1477   D->getQualifier()->print(Out, Policy);
1478   Out << D->getDeclName();
1479 }
1480 
1481 void DeclPrinter::VisitUsingShadowDecl(UsingShadowDecl *D) {
1482   // ignore
1483 }
1484 
1485 void DeclPrinter::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
1486   Out << "#pragma omp threadprivate";
1487   if (!D->varlist_empty()) {
1488     for (OMPThreadPrivateDecl::varlist_iterator I = D->varlist_begin(),
1489                                                 E = D->varlist_end();
1490                                                 I != E; ++I) {
1491       Out << (I == D->varlist_begin() ? '(' : ',');
1492       NamedDecl *ND = cast<NamedDecl>(cast<DeclRefExpr>(*I)->getDecl());
1493       ND->printQualifiedName(Out);
1494     }
1495     Out << ")";
1496   }
1497 }
1498 
1499 void DeclPrinter::VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D) {
1500   if (!D->isInvalidDecl()) {
1501     Out << "#pragma omp declare reduction (";
1502     if (D->getDeclName().getNameKind() == DeclarationName::CXXOperatorName) {
1503       static const char *const OperatorNames[NUM_OVERLOADED_OPERATORS] = {
1504           nullptr,
1505 #define OVERLOADED_OPERATOR(Name, Spelling, Token, Unary, Binary, MemberOnly)  \
1506           Spelling,
1507 #include "clang/Basic/OperatorKinds.def"
1508       };
1509       const char *OpName =
1510           OperatorNames[D->getDeclName().getCXXOverloadedOperator()];
1511       assert(OpName && "not an overloaded operator");
1512       Out << OpName;
1513     } else {
1514       assert(D->getDeclName().isIdentifier());
1515       D->printName(Out);
1516     }
1517     Out << " : ";
1518     D->getType().print(Out, Policy);
1519     Out << " : ";
1520     D->getCombiner()->printPretty(Out, nullptr, Policy, 0);
1521     Out << ")";
1522     if (auto *Init = D->getInitializer()) {
1523       Out << " initializer(";
1524       Init->printPretty(Out, nullptr, Policy, 0);
1525       Out << ")";
1526     }
1527   }
1528 }
1529 
1530 void DeclPrinter::VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D) {
1531   D->getInit()->printPretty(Out, nullptr, Policy, Indentation);
1532 }
1533 
1534