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