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;
508   if (!Policy.SuppressScope) {
509     if (const NestedNameSpecifier *NS = D->getQualifier()) {
510       llvm::raw_string_ostream OS(Proto);
511       NS->print(OS, Policy);
512     }
513   }
514   Proto += D->getNameInfo().getAsString();
515   if (GuideDecl)
516     Proto = GuideDecl->getDeducedTemplate()->getDeclName().getAsString();
517   if (const TemplateArgumentList *TArgs = D->getTemplateSpecializationArgs()) {
518     llvm::raw_string_ostream POut(Proto);
519     DeclPrinter TArgPrinter(POut, SubPolicy, Indentation);
520     TArgPrinter.printTemplateArguments(*TArgs);
521   }
522 
523   QualType Ty = D->getType();
524   while (const ParenType *PT = dyn_cast<ParenType>(Ty)) {
525     Proto = '(' + Proto + ')';
526     Ty = PT->getInnerType();
527   }
528 
529   if (const FunctionType *AFT = Ty->getAs<FunctionType>()) {
530     const FunctionProtoType *FT = nullptr;
531     if (D->hasWrittenPrototype())
532       FT = dyn_cast<FunctionProtoType>(AFT);
533 
534     Proto += "(";
535     if (FT) {
536       llvm::raw_string_ostream POut(Proto);
537       DeclPrinter ParamPrinter(POut, SubPolicy, Indentation);
538       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
539         if (i) POut << ", ";
540         ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
541       }
542 
543       if (FT->isVariadic()) {
544         if (D->getNumParams()) POut << ", ";
545         POut << "...";
546       }
547     } else if (D->doesThisDeclarationHaveABody() && !D->hasPrototype()) {
548       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
549         if (i)
550           Proto += ", ";
551         Proto += D->getParamDecl(i)->getNameAsString();
552       }
553     }
554 
555     Proto += ")";
556 
557     if (FT) {
558       if (FT->isConst())
559         Proto += " const";
560       if (FT->isVolatile())
561         Proto += " volatile";
562       if (FT->isRestrict())
563         Proto += " restrict";
564 
565       switch (FT->getRefQualifier()) {
566       case RQ_None:
567         break;
568       case RQ_LValue:
569         Proto += " &";
570         break;
571       case RQ_RValue:
572         Proto += " &&";
573         break;
574       }
575     }
576 
577     if (FT && FT->hasDynamicExceptionSpec()) {
578       Proto += " throw(";
579       if (FT->getExceptionSpecType() == EST_MSAny)
580         Proto += "...";
581       else
582         for (unsigned I = 0, N = FT->getNumExceptions(); I != N; ++I) {
583           if (I)
584             Proto += ", ";
585 
586           Proto += FT->getExceptionType(I).getAsString(SubPolicy);
587         }
588       Proto += ")";
589     } else if (FT && isNoexceptExceptionSpec(FT->getExceptionSpecType())) {
590       Proto += " noexcept";
591       if (FT->getExceptionSpecType() == EST_ComputedNoexcept) {
592         Proto += "(";
593         llvm::raw_string_ostream EOut(Proto);
594         FT->getNoexceptExpr()->printPretty(EOut, nullptr, SubPolicy,
595                                            Indentation);
596         EOut.flush();
597         Proto += EOut.str();
598         Proto += ")";
599       }
600     }
601 
602     if (CDecl) {
603       bool HasInitializerList = false;
604       for (const auto *BMInitializer : CDecl->inits()) {
605         if (BMInitializer->isInClassMemberInitializer())
606           continue;
607 
608         if (!HasInitializerList) {
609           Proto += " : ";
610           Out << Proto;
611           Proto.clear();
612           HasInitializerList = true;
613         } else
614           Out << ", ";
615 
616         if (BMInitializer->isAnyMemberInitializer()) {
617           FieldDecl *FD = BMInitializer->getAnyMember();
618           Out << *FD;
619         } else {
620           Out << QualType(BMInitializer->getBaseClass(), 0).getAsString(Policy);
621         }
622 
623         Out << "(";
624         if (!BMInitializer->getInit()) {
625           // Nothing to print
626         } else {
627           Expr *Init = BMInitializer->getInit();
628           if (ExprWithCleanups *Tmp = dyn_cast<ExprWithCleanups>(Init))
629             Init = Tmp->getSubExpr();
630 
631           Init = Init->IgnoreParens();
632 
633           Expr *SimpleInit = nullptr;
634           Expr **Args = nullptr;
635           unsigned NumArgs = 0;
636           if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
637             Args = ParenList->getExprs();
638             NumArgs = ParenList->getNumExprs();
639           } else if (CXXConstructExpr *Construct
640                                         = dyn_cast<CXXConstructExpr>(Init)) {
641             Args = Construct->getArgs();
642             NumArgs = Construct->getNumArgs();
643           } else
644             SimpleInit = Init;
645 
646           if (SimpleInit)
647             SimpleInit->printPretty(Out, nullptr, Policy, Indentation);
648           else {
649             for (unsigned I = 0; I != NumArgs; ++I) {
650               assert(Args[I] != nullptr && "Expected non-null Expr");
651               if (isa<CXXDefaultArgExpr>(Args[I]))
652                 break;
653 
654               if (I)
655                 Out << ", ";
656               Args[I]->printPretty(Out, nullptr, Policy, Indentation);
657             }
658           }
659         }
660         Out << ")";
661         if (BMInitializer->isPackExpansion())
662           Out << "...";
663       }
664     } else if (!ConversionDecl && !isa<CXXDestructorDecl>(D)) {
665       if (FT && FT->hasTrailingReturn()) {
666         if (!GuideDecl)
667           Out << "auto ";
668         Out << Proto << " -> ";
669         Proto.clear();
670       }
671       AFT->getReturnType().print(Out, Policy, Proto);
672       Proto.clear();
673     }
674     Out << Proto;
675   } else {
676     Ty.print(Out, Policy, Proto);
677   }
678 
679   prettyPrintAttributes(D);
680 
681   if (D->isPure())
682     Out << " = 0";
683   else if (D->isDeletedAsWritten())
684     Out << " = delete";
685   else if (D->isExplicitlyDefaulted())
686     Out << " = default";
687   else if (D->doesThisDeclarationHaveABody()) {
688     if (!Policy.TerseOutput) {
689       if (!D->hasPrototype() && D->getNumParams()) {
690         // This is a K&R function definition, so we need to print the
691         // parameters.
692         Out << '\n';
693         DeclPrinter ParamPrinter(Out, SubPolicy, Indentation);
694         Indentation += Policy.Indentation;
695         for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
696           Indent();
697           ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
698           Out << ";\n";
699         }
700         Indentation -= Policy.Indentation;
701       } else
702         Out << ' ';
703 
704       if (D->getBody())
705         D->getBody()->printPretty(Out, nullptr, SubPolicy, Indentation);
706     } else {
707       if (isa<CXXConstructorDecl>(*D))
708         Out << " {}";
709     }
710   }
711 }
712 
713 void DeclPrinter::VisitFriendDecl(FriendDecl *D) {
714   if (TypeSourceInfo *TSI = D->getFriendType()) {
715     unsigned NumTPLists = D->getFriendTypeNumTemplateParameterLists();
716     for (unsigned i = 0; i < NumTPLists; ++i)
717       printTemplateParameters(D->getFriendTypeTemplateParameterList(i));
718     Out << "friend ";
719     Out << " " << TSI->getType().getAsString(Policy);
720   }
721   else if (FunctionDecl *FD =
722       dyn_cast<FunctionDecl>(D->getFriendDecl())) {
723     Out << "friend ";
724     VisitFunctionDecl(FD);
725   }
726   else if (FunctionTemplateDecl *FTD =
727            dyn_cast<FunctionTemplateDecl>(D->getFriendDecl())) {
728     Out << "friend ";
729     VisitFunctionTemplateDecl(FTD);
730   }
731   else if (ClassTemplateDecl *CTD =
732            dyn_cast<ClassTemplateDecl>(D->getFriendDecl())) {
733     Out << "friend ";
734     VisitRedeclarableTemplateDecl(CTD);
735   }
736 }
737 
738 void DeclPrinter::VisitFieldDecl(FieldDecl *D) {
739   // FIXME: add printing of pragma attributes if required.
740   if (!Policy.SuppressSpecifiers && D->isMutable())
741     Out << "mutable ";
742   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
743     Out << "__module_private__ ";
744 
745   Out << D->getASTContext().getUnqualifiedObjCPointerType(D->getType()).
746          stream(Policy, D->getName(), Indentation);
747 
748   if (D->isBitField()) {
749     Out << " : ";
750     D->getBitWidth()->printPretty(Out, nullptr, Policy, Indentation);
751   }
752 
753   Expr *Init = D->getInClassInitializer();
754   if (!Policy.SuppressInitializers && Init) {
755     if (D->getInClassInitStyle() == ICIS_ListInit)
756       Out << " ";
757     else
758       Out << " = ";
759     Init->printPretty(Out, nullptr, Policy, Indentation);
760   }
761   prettyPrintAttributes(D);
762 }
763 
764 void DeclPrinter::VisitLabelDecl(LabelDecl *D) {
765   Out << *D << ":";
766 }
767 
768 void DeclPrinter::VisitVarDecl(VarDecl *D) {
769   prettyPrintPragmas(D);
770 
771   QualType T = D->getTypeSourceInfo()
772     ? D->getTypeSourceInfo()->getType()
773     : D->getASTContext().getUnqualifiedObjCPointerType(D->getType());
774 
775   if (!Policy.SuppressSpecifiers) {
776     StorageClass SC = D->getStorageClass();
777     if (SC != SC_None)
778       Out << VarDecl::getStorageClassSpecifierString(SC) << " ";
779 
780     switch (D->getTSCSpec()) {
781     case TSCS_unspecified:
782       break;
783     case TSCS___thread:
784       Out << "__thread ";
785       break;
786     case TSCS__Thread_local:
787       Out << "_Thread_local ";
788       break;
789     case TSCS_thread_local:
790       Out << "thread_local ";
791       break;
792     }
793 
794     if (D->isModulePrivate())
795       Out << "__module_private__ ";
796 
797     if (D->isConstexpr()) {
798       Out << "constexpr ";
799       T.removeLocalConst();
800     }
801   }
802 
803   printDeclType(T, D->getName());
804   Expr *Init = D->getInit();
805   if (!Policy.SuppressInitializers && Init) {
806     bool ImplicitInit = false;
807     if (CXXConstructExpr *Construct =
808             dyn_cast<CXXConstructExpr>(Init->IgnoreImplicit())) {
809       if (D->getInitStyle() == VarDecl::CallInit &&
810           !Construct->isListInitialization()) {
811         ImplicitInit = Construct->getNumArgs() == 0 ||
812           Construct->getArg(0)->isDefaultArgument();
813       }
814     }
815     if (!ImplicitInit) {
816       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
817         Out << "(";
818       else if (D->getInitStyle() == VarDecl::CInit) {
819         Out << " = ";
820       }
821       PrintingPolicy SubPolicy(Policy);
822       SubPolicy.SuppressSpecifiers = false;
823       SubPolicy.IncludeTagDefinition = false;
824       Init->printPretty(Out, nullptr, SubPolicy, Indentation);
825       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
826         Out << ")";
827     }
828   }
829   prettyPrintAttributes(D);
830 }
831 
832 void DeclPrinter::VisitParmVarDecl(ParmVarDecl *D) {
833   VisitVarDecl(D);
834 }
835 
836 void DeclPrinter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
837   Out << "__asm (";
838   D->getAsmString()->printPretty(Out, nullptr, Policy, Indentation);
839   Out << ")";
840 }
841 
842 void DeclPrinter::VisitImportDecl(ImportDecl *D) {
843   Out << "@import " << D->getImportedModule()->getFullModuleName()
844       << ";\n";
845 }
846 
847 void DeclPrinter::VisitStaticAssertDecl(StaticAssertDecl *D) {
848   Out << "static_assert(";
849   D->getAssertExpr()->printPretty(Out, nullptr, Policy, Indentation);
850   if (StringLiteral *SL = D->getMessage()) {
851     Out << ", ";
852     SL->printPretty(Out, nullptr, Policy, Indentation);
853   }
854   Out << ")";
855 }
856 
857 //----------------------------------------------------------------------------
858 // C++ declarations
859 //----------------------------------------------------------------------------
860 void DeclPrinter::VisitNamespaceDecl(NamespaceDecl *D) {
861   if (D->isInline())
862     Out << "inline ";
863   Out << "namespace " << *D << " {\n";
864   VisitDeclContext(D);
865   Indent() << "}";
866 }
867 
868 void DeclPrinter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
869   Out << "using namespace ";
870   if (D->getQualifier())
871     D->getQualifier()->print(Out, Policy);
872   Out << *D->getNominatedNamespaceAsWritten();
873 }
874 
875 void DeclPrinter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
876   Out << "namespace " << *D << " = ";
877   if (D->getQualifier())
878     D->getQualifier()->print(Out, Policy);
879   Out << *D->getAliasedNamespace();
880 }
881 
882 void DeclPrinter::VisitEmptyDecl(EmptyDecl *D) {
883   prettyPrintAttributes(D);
884 }
885 
886 void DeclPrinter::VisitCXXRecordDecl(CXXRecordDecl *D) {
887   // FIXME: add printing of pragma attributes if required.
888   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
889     Out << "__module_private__ ";
890   Out << D->getKindName();
891 
892   prettyPrintAttributes(D);
893 
894   if (D->getIdentifier()) {
895     Out << ' ' << *D;
896 
897     if (auto S = dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
898       printTemplateArguments(S->getTemplateArgs(), S->getTemplateParameters());
899     else if (auto S = dyn_cast<ClassTemplateSpecializationDecl>(D))
900       printTemplateArguments(S->getTemplateArgs());
901   }
902 
903   if (D->isCompleteDefinition()) {
904     // Print the base classes
905     if (D->getNumBases()) {
906       Out << " : ";
907       for (CXXRecordDecl::base_class_iterator Base = D->bases_begin(),
908              BaseEnd = D->bases_end(); Base != BaseEnd; ++Base) {
909         if (Base != D->bases_begin())
910           Out << ", ";
911 
912         if (Base->isVirtual())
913           Out << "virtual ";
914 
915         AccessSpecifier AS = Base->getAccessSpecifierAsWritten();
916         if (AS != AS_none) {
917           Print(AS);
918           Out << " ";
919         }
920         Out << Base->getType().getAsString(Policy);
921 
922         if (Base->isPackExpansion())
923           Out << "...";
924       }
925     }
926 
927     // Print the class definition
928     // FIXME: Doesn't print access specifiers, e.g., "public:"
929     if (Policy.TerseOutput) {
930       Out << " {}";
931     } else {
932       Out << " {\n";
933       VisitDeclContext(D);
934       Indent() << "}";
935     }
936   }
937 }
938 
939 void DeclPrinter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
940   const char *l;
941   if (D->getLanguage() == LinkageSpecDecl::lang_c)
942     l = "C";
943   else {
944     assert(D->getLanguage() == LinkageSpecDecl::lang_cxx &&
945            "unknown language in linkage specification");
946     l = "C++";
947   }
948 
949   Out << "extern \"" << l << "\" ";
950   if (D->hasBraces()) {
951     Out << "{\n";
952     VisitDeclContext(D);
953     Indent() << "}";
954   } else
955     Visit(*D->decls_begin());
956 }
957 
958 void DeclPrinter::printTemplateParameters(const TemplateParameterList *Params) {
959   assert(Params);
960 
961   Out << "template <";
962 
963   for (unsigned i = 0, e = Params->size(); i != e; ++i) {
964     if (i != 0)
965       Out << ", ";
966 
967     const Decl *Param = Params->getParam(i);
968     if (auto TTP = dyn_cast<TemplateTypeParmDecl>(Param)) {
969 
970       if (TTP->wasDeclaredWithTypename())
971         Out << "typename ";
972       else
973         Out << "class ";
974 
975       if (TTP->isParameterPack())
976         Out << "...";
977 
978       Out << *TTP;
979 
980       if (TTP->hasDefaultArgument()) {
981         Out << " = ";
982         Out << TTP->getDefaultArgument().getAsString(Policy);
983       };
984     } else if (auto NTTP = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
985       StringRef Name;
986       if (IdentifierInfo *II = NTTP->getIdentifier())
987         Name = II->getName();
988       printDeclType(NTTP->getType(), Name, NTTP->isParameterPack());
989 
990       if (NTTP->hasDefaultArgument()) {
991         Out << " = ";
992         NTTP->getDefaultArgument()->printPretty(Out, nullptr, Policy,
993                                                 Indentation);
994       }
995     } else if (auto TTPD = dyn_cast<TemplateTemplateParmDecl>(Param)) {
996       VisitTemplateDecl(TTPD);
997       // FIXME: print the default argument, if present.
998     }
999   }
1000 
1001   Out << "> ";
1002 }
1003 
1004 void DeclPrinter::printTemplateArguments(const TemplateArgumentList &Args,
1005                                          const TemplateParameterList *Params) {
1006   Out << "<";
1007   for (size_t I = 0, E = Args.size(); I < E; ++I) {
1008     const TemplateArgument &A = Args[I];
1009     if (I)
1010       Out << ", ";
1011     if (Params) {
1012       if (A.getKind() == TemplateArgument::Type)
1013         if (auto T = A.getAsType()->getAs<TemplateTypeParmType>()) {
1014           auto P = cast<TemplateTypeParmDecl>(Params->getParam(T->getIndex()));
1015           Out << *P;
1016           continue;
1017         }
1018       if (A.getKind() == TemplateArgument::Template) {
1019         if (auto T = A.getAsTemplate().getAsTemplateDecl())
1020           if (auto TD = dyn_cast<TemplateTemplateParmDecl>(T)) {
1021             auto P = cast<TemplateTemplateParmDecl>(
1022                                               Params->getParam(TD->getIndex()));
1023             Out << *P;
1024             continue;
1025           }
1026       }
1027       if (A.getKind() == TemplateArgument::Expression) {
1028         if (auto E = dyn_cast<DeclRefExpr>(A.getAsExpr()))
1029           if (auto N = dyn_cast<NonTypeTemplateParmDecl>(E->getDecl())) {
1030             auto P = cast<NonTypeTemplateParmDecl>(
1031                                                Params->getParam(N->getIndex()));
1032             Out << *P;
1033             continue;
1034           }
1035       }
1036     }
1037     A.print(Policy, Out);
1038   }
1039   Out << ">";
1040 }
1041 
1042 void DeclPrinter::VisitTemplateDecl(const TemplateDecl *D) {
1043   printTemplateParameters(D->getTemplateParameters());
1044 
1045   if (const TemplateTemplateParmDecl *TTP =
1046         dyn_cast<TemplateTemplateParmDecl>(D)) {
1047     Out << "class ";
1048     if (TTP->isParameterPack())
1049       Out << "...";
1050     Out << D->getName();
1051   } else {
1052     Visit(D->getTemplatedDecl());
1053   }
1054 }
1055 
1056 void DeclPrinter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1057   prettyPrintPragmas(D->getTemplatedDecl());
1058   VisitRedeclarableTemplateDecl(D);
1059 
1060   // Never print "instantiations" for deduction guides (they don't really
1061   // have them).
1062   if (PrintInstantiation &&
1063       !isa<CXXDeductionGuideDecl>(D->getTemplatedDecl())) {
1064     FunctionDecl *PrevDecl = D->getTemplatedDecl();
1065     const FunctionDecl *Def;
1066     if (PrevDecl->isDefined(Def) && Def != PrevDecl)
1067       return;
1068     for (auto *I : D->specializations())
1069       if (I->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) {
1070         if (!PrevDecl->isThisDeclarationADefinition())
1071           Out << ";\n";
1072         Indent();
1073         prettyPrintPragmas(I);
1074         Visit(I);
1075       }
1076   }
1077 }
1078 
1079 void DeclPrinter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1080   VisitRedeclarableTemplateDecl(D);
1081 
1082   if (PrintInstantiation) {
1083     for (auto *I : D->specializations())
1084       if (I->getSpecializationKind() == TSK_ImplicitInstantiation) {
1085         if (D->isThisDeclarationADefinition())
1086           Out << ";";
1087         Out << "\n";
1088         Visit(I);
1089       }
1090   }
1091 }
1092 
1093 void DeclPrinter::VisitClassTemplateSpecializationDecl(
1094                                            ClassTemplateSpecializationDecl *D) {
1095   Out << "template<> ";
1096   VisitCXXRecordDecl(D);
1097 }
1098 
1099 void DeclPrinter::VisitClassTemplatePartialSpecializationDecl(
1100                                     ClassTemplatePartialSpecializationDecl *D) {
1101   printTemplateParameters(D->getTemplateParameters());
1102   VisitCXXRecordDecl(D);
1103 }
1104 
1105 //----------------------------------------------------------------------------
1106 // Objective-C declarations
1107 //----------------------------------------------------------------------------
1108 
1109 void DeclPrinter::PrintObjCMethodType(ASTContext &Ctx,
1110                                       Decl::ObjCDeclQualifier Quals,
1111                                       QualType T) {
1112   Out << '(';
1113   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_In)
1114     Out << "in ";
1115   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Inout)
1116     Out << "inout ";
1117   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Out)
1118     Out << "out ";
1119   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Bycopy)
1120     Out << "bycopy ";
1121   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Byref)
1122     Out << "byref ";
1123   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Oneway)
1124     Out << "oneway ";
1125   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_CSNullability) {
1126     if (auto nullability = AttributedType::stripOuterNullability(T))
1127       Out << getNullabilitySpelling(*nullability, true) << ' ';
1128   }
1129 
1130   Out << Ctx.getUnqualifiedObjCPointerType(T).getAsString(Policy);
1131   Out << ')';
1132 }
1133 
1134 void DeclPrinter::PrintObjCTypeParams(ObjCTypeParamList *Params) {
1135   Out << "<";
1136   unsigned First = true;
1137   for (auto *Param : *Params) {
1138     if (First) {
1139       First = false;
1140     } else {
1141       Out << ", ";
1142     }
1143 
1144     switch (Param->getVariance()) {
1145     case ObjCTypeParamVariance::Invariant:
1146       break;
1147 
1148     case ObjCTypeParamVariance::Covariant:
1149       Out << "__covariant ";
1150       break;
1151 
1152     case ObjCTypeParamVariance::Contravariant:
1153       Out << "__contravariant ";
1154       break;
1155     }
1156 
1157     Out << Param->getDeclName().getAsString();
1158 
1159     if (Param->hasExplicitBound()) {
1160       Out << " : " << Param->getUnderlyingType().getAsString(Policy);
1161     }
1162   }
1163   Out << ">";
1164 }
1165 
1166 void DeclPrinter::VisitObjCMethodDecl(ObjCMethodDecl *OMD) {
1167   if (OMD->isInstanceMethod())
1168     Out << "- ";
1169   else
1170     Out << "+ ";
1171   if (!OMD->getReturnType().isNull()) {
1172     PrintObjCMethodType(OMD->getASTContext(), OMD->getObjCDeclQualifier(),
1173                         OMD->getReturnType());
1174   }
1175 
1176   std::string name = OMD->getSelector().getAsString();
1177   std::string::size_type pos, lastPos = 0;
1178   for (const auto *PI : OMD->parameters()) {
1179     // FIXME: selector is missing here!
1180     pos = name.find_first_of(':', lastPos);
1181     Out << " " << name.substr(lastPos, pos - lastPos) << ':';
1182     PrintObjCMethodType(OMD->getASTContext(),
1183                         PI->getObjCDeclQualifier(),
1184                         PI->getType());
1185     Out << *PI;
1186     lastPos = pos + 1;
1187   }
1188 
1189   if (OMD->param_begin() == OMD->param_end())
1190     Out << " " << name;
1191 
1192   if (OMD->isVariadic())
1193       Out << ", ...";
1194 
1195   prettyPrintAttributes(OMD);
1196 
1197   if (OMD->getBody() && !Policy.TerseOutput) {
1198     Out << ' ';
1199     OMD->getBody()->printPretty(Out, nullptr, Policy);
1200   }
1201   else if (Policy.PolishForDeclaration)
1202     Out << ';';
1203 }
1204 
1205 void DeclPrinter::VisitObjCImplementationDecl(ObjCImplementationDecl *OID) {
1206   std::string I = OID->getNameAsString();
1207   ObjCInterfaceDecl *SID = OID->getSuperClass();
1208 
1209   bool eolnOut = false;
1210   if (SID)
1211     Out << "@implementation " << I << " : " << *SID;
1212   else
1213     Out << "@implementation " << I;
1214 
1215   if (OID->ivar_size() > 0) {
1216     Out << "{\n";
1217     eolnOut = true;
1218     Indentation += Policy.Indentation;
1219     for (const auto *I : OID->ivars()) {
1220       Indent() << I->getASTContext().getUnqualifiedObjCPointerType(I->getType()).
1221                     getAsString(Policy) << ' ' << *I << ";\n";
1222     }
1223     Indentation -= Policy.Indentation;
1224     Out << "}\n";
1225   }
1226   else if (SID || (OID->decls_begin() != OID->decls_end())) {
1227     Out << "\n";
1228     eolnOut = true;
1229   }
1230   VisitDeclContext(OID, false);
1231   if (!eolnOut)
1232     Out << "\n";
1233   Out << "@end";
1234 }
1235 
1236 void DeclPrinter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *OID) {
1237   std::string I = OID->getNameAsString();
1238   ObjCInterfaceDecl *SID = OID->getSuperClass();
1239 
1240   if (!OID->isThisDeclarationADefinition()) {
1241     Out << "@class " << I;
1242 
1243     if (auto TypeParams = OID->getTypeParamListAsWritten()) {
1244       PrintObjCTypeParams(TypeParams);
1245     }
1246 
1247     Out << ";";
1248     return;
1249   }
1250   bool eolnOut = false;
1251   Out << "@interface " << I;
1252 
1253   if (auto TypeParams = OID->getTypeParamListAsWritten()) {
1254     PrintObjCTypeParams(TypeParams);
1255   }
1256 
1257   if (SID)
1258     Out << " : " << QualType(OID->getSuperClassType(), 0).getAsString(Policy);
1259 
1260   // Protocols?
1261   const ObjCList<ObjCProtocolDecl> &Protocols = OID->getReferencedProtocols();
1262   if (!Protocols.empty()) {
1263     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
1264          E = Protocols.end(); I != E; ++I)
1265       Out << (I == Protocols.begin() ? '<' : ',') << **I;
1266     Out << "> ";
1267   }
1268 
1269   if (OID->ivar_size() > 0) {
1270     Out << "{\n";
1271     eolnOut = true;
1272     Indentation += Policy.Indentation;
1273     for (const auto *I : OID->ivars()) {
1274       Indent() << I->getASTContext()
1275                       .getUnqualifiedObjCPointerType(I->getType())
1276                       .getAsString(Policy) << ' ' << *I << ";\n";
1277     }
1278     Indentation -= Policy.Indentation;
1279     Out << "}\n";
1280   }
1281   else if (SID || (OID->decls_begin() != OID->decls_end())) {
1282     Out << "\n";
1283     eolnOut = true;
1284   }
1285 
1286   VisitDeclContext(OID, false);
1287   if (!eolnOut)
1288     Out << "\n";
1289   Out << "@end";
1290   // FIXME: implement the rest...
1291 }
1292 
1293 void DeclPrinter::VisitObjCProtocolDecl(ObjCProtocolDecl *PID) {
1294   if (!PID->isThisDeclarationADefinition()) {
1295     Out << "@protocol " << *PID << ";\n";
1296     return;
1297   }
1298   // Protocols?
1299   const ObjCList<ObjCProtocolDecl> &Protocols = PID->getReferencedProtocols();
1300   if (!Protocols.empty()) {
1301     Out << "@protocol " << *PID;
1302     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
1303          E = Protocols.end(); I != E; ++I)
1304       Out << (I == Protocols.begin() ? '<' : ',') << **I;
1305     Out << ">\n";
1306   } else
1307     Out << "@protocol " << *PID << '\n';
1308   VisitDeclContext(PID, false);
1309   Out << "@end";
1310 }
1311 
1312 void DeclPrinter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *PID) {
1313   Out << "@implementation " << *PID->getClassInterface() << '(' << *PID <<")\n";
1314 
1315   VisitDeclContext(PID, false);
1316   Out << "@end";
1317   // FIXME: implement the rest...
1318 }
1319 
1320 void DeclPrinter::VisitObjCCategoryDecl(ObjCCategoryDecl *PID) {
1321   Out << "@interface " << *PID->getClassInterface();
1322   if (auto TypeParams = PID->getTypeParamList()) {
1323     PrintObjCTypeParams(TypeParams);
1324   }
1325   Out << "(" << *PID << ")\n";
1326   if (PID->ivar_size() > 0) {
1327     Out << "{\n";
1328     Indentation += Policy.Indentation;
1329     for (const auto *I : PID->ivars())
1330       Indent() << I->getASTContext().getUnqualifiedObjCPointerType(I->getType()).
1331                     getAsString(Policy) << ' ' << *I << ";\n";
1332     Indentation -= Policy.Indentation;
1333     Out << "}\n";
1334   }
1335 
1336   VisitDeclContext(PID, false);
1337   Out << "@end";
1338 
1339   // FIXME: implement the rest...
1340 }
1341 
1342 void DeclPrinter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *AID) {
1343   Out << "@compatibility_alias " << *AID
1344       << ' ' << *AID->getClassInterface() << ";\n";
1345 }
1346 
1347 /// PrintObjCPropertyDecl - print a property declaration.
1348 ///
1349 void DeclPrinter::VisitObjCPropertyDecl(ObjCPropertyDecl *PDecl) {
1350   if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Required)
1351     Out << "@required\n";
1352   else if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Optional)
1353     Out << "@optional\n";
1354 
1355   QualType T = PDecl->getType();
1356 
1357   Out << "@property";
1358   if (PDecl->getPropertyAttributes() != ObjCPropertyDecl::OBJC_PR_noattr) {
1359     bool first = true;
1360     Out << " (";
1361     if (PDecl->getPropertyAttributes() &
1362         ObjCPropertyDecl::OBJC_PR_readonly) {
1363       Out << (first ? ' ' : ',') << "readonly";
1364       first = false;
1365     }
1366 
1367     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) {
1368       Out << (first ? ' ' : ',') << "getter = ";
1369       PDecl->getGetterName().print(Out);
1370       first = false;
1371     }
1372     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) {
1373       Out << (first ? ' ' : ',') << "setter = ";
1374       PDecl->getSetterName().print(Out);
1375       first = false;
1376     }
1377 
1378     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_assign) {
1379       Out << (first ? ' ' : ',') << "assign";
1380       first = false;
1381     }
1382 
1383     if (PDecl->getPropertyAttributes() &
1384         ObjCPropertyDecl::OBJC_PR_readwrite) {
1385       Out << (first ? ' ' : ',') << "readwrite";
1386       first = false;
1387     }
1388 
1389     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_retain) {
1390       Out << (first ? ' ' : ',') << "retain";
1391       first = false;
1392     }
1393 
1394     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_strong) {
1395       Out << (first ? ' ' : ',') << "strong";
1396       first = false;
1397     }
1398 
1399     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_copy) {
1400       Out << (first ? ' ' : ',') << "copy";
1401       first = false;
1402     }
1403 
1404     if (PDecl->getPropertyAttributes() &
1405         ObjCPropertyDecl::OBJC_PR_nonatomic) {
1406       Out << (first ? ' ' : ',') << "nonatomic";
1407       first = false;
1408     }
1409     if (PDecl->getPropertyAttributes() &
1410         ObjCPropertyDecl::OBJC_PR_atomic) {
1411       Out << (first ? ' ' : ',') << "atomic";
1412       first = false;
1413     }
1414 
1415     if (PDecl->getPropertyAttributes() &
1416         ObjCPropertyDecl::OBJC_PR_nullability) {
1417       if (auto nullability = AttributedType::stripOuterNullability(T)) {
1418         if (*nullability == NullabilityKind::Unspecified &&
1419             (PDecl->getPropertyAttributes() &
1420                ObjCPropertyDecl::OBJC_PR_null_resettable)) {
1421           Out << (first ? ' ' : ',') << "null_resettable";
1422         } else {
1423           Out << (first ? ' ' : ',')
1424               << getNullabilitySpelling(*nullability, true);
1425         }
1426         first = false;
1427       }
1428     }
1429 
1430     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_class) {
1431       Out << (first ? ' ' : ',') << "class";
1432       first = false;
1433     }
1434 
1435     (void) first; // Silence dead store warning due to idiomatic code.
1436     Out << " )";
1437   }
1438   Out << ' ' << PDecl->getASTContext().getUnqualifiedObjCPointerType(T).
1439                   getAsString(Policy) << ' ' << *PDecl;
1440   if (Policy.PolishForDeclaration)
1441     Out << ';';
1442 }
1443 
1444 void DeclPrinter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *PID) {
1445   if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize)
1446     Out << "@synthesize ";
1447   else
1448     Out << "@dynamic ";
1449   Out << *PID->getPropertyDecl();
1450   if (PID->getPropertyIvarDecl())
1451     Out << '=' << *PID->getPropertyIvarDecl();
1452 }
1453 
1454 void DeclPrinter::VisitUsingDecl(UsingDecl *D) {
1455   if (!D->isAccessDeclaration())
1456     Out << "using ";
1457   if (D->hasTypename())
1458     Out << "typename ";
1459   D->getQualifier()->print(Out, Policy);
1460 
1461   // Use the correct record name when the using declaration is used for
1462   // inheriting constructors.
1463   for (const auto *Shadow : D->shadows()) {
1464     if (const auto *ConstructorShadow =
1465             dyn_cast<ConstructorUsingShadowDecl>(Shadow)) {
1466       assert(Shadow->getDeclContext() == ConstructorShadow->getDeclContext());
1467       Out << *ConstructorShadow->getNominatedBaseClass();
1468       return;
1469     }
1470   }
1471   Out << *D;
1472 }
1473 
1474 void
1475 DeclPrinter::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) {
1476   Out << "using typename ";
1477   D->getQualifier()->print(Out, Policy);
1478   Out << D->getDeclName();
1479 }
1480 
1481 void DeclPrinter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1482   if (!D->isAccessDeclaration())
1483     Out << "using ";
1484   D->getQualifier()->print(Out, Policy);
1485   Out << D->getDeclName();
1486 }
1487 
1488 void DeclPrinter::VisitUsingShadowDecl(UsingShadowDecl *D) {
1489   // ignore
1490 }
1491 
1492 void DeclPrinter::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
1493   Out << "#pragma omp threadprivate";
1494   if (!D->varlist_empty()) {
1495     for (OMPThreadPrivateDecl::varlist_iterator I = D->varlist_begin(),
1496                                                 E = D->varlist_end();
1497                                                 I != E; ++I) {
1498       Out << (I == D->varlist_begin() ? '(' : ',');
1499       NamedDecl *ND = cast<NamedDecl>(cast<DeclRefExpr>(*I)->getDecl());
1500       ND->printQualifiedName(Out);
1501     }
1502     Out << ")";
1503   }
1504 }
1505 
1506 void DeclPrinter::VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D) {
1507   if (!D->isInvalidDecl()) {
1508     Out << "#pragma omp declare reduction (";
1509     if (D->getDeclName().getNameKind() == DeclarationName::CXXOperatorName) {
1510       static const char *const OperatorNames[NUM_OVERLOADED_OPERATORS] = {
1511           nullptr,
1512 #define OVERLOADED_OPERATOR(Name, Spelling, Token, Unary, Binary, MemberOnly)  \
1513           Spelling,
1514 #include "clang/Basic/OperatorKinds.def"
1515       };
1516       const char *OpName =
1517           OperatorNames[D->getDeclName().getCXXOverloadedOperator()];
1518       assert(OpName && "not an overloaded operator");
1519       Out << OpName;
1520     } else {
1521       assert(D->getDeclName().isIdentifier());
1522       D->printName(Out);
1523     }
1524     Out << " : ";
1525     D->getType().print(Out, Policy);
1526     Out << " : ";
1527     D->getCombiner()->printPretty(Out, nullptr, Policy, 0);
1528     Out << ")";
1529     if (auto *Init = D->getInitializer()) {
1530       Out << " initializer(";
1531       Init->printPretty(Out, nullptr, Policy, 0);
1532       Out << ")";
1533     }
1534   }
1535 }
1536 
1537 void DeclPrinter::VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D) {
1538   D->getInit()->printPretty(Out, nullptr, Policy, Indentation);
1539 }
1540 
1541