1 //===--- DeclPrinter.cpp - Printing implementation for Decl ASTs ----------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the Decl::print method, which pretty prints the
11 // AST back out to C/Objective-C/C++/Objective-C++ code.
12 //
13 //===----------------------------------------------------------------------===//
14 #include "clang/AST/ASTContext.h"
15 #include "clang/AST/Attr.h"
16 #include "clang/AST/Decl.h"
17 #include "clang/AST/DeclCXX.h"
18 #include "clang/AST/DeclObjC.h"
19 #include "clang/AST/DeclVisitor.h"
20 #include "clang/AST/Expr.h"
21 #include "clang/AST/ExprCXX.h"
22 #include "clang/AST/PrettyPrinter.h"
23 #include "clang/Basic/Module.h"
24 #include "llvm/Support/raw_ostream.h"
25 using namespace clang;
26 
27 namespace {
28   class DeclPrinter : public DeclVisitor<DeclPrinter> {
29     raw_ostream &Out;
30     PrintingPolicy Policy;
31     const ASTContext &Context;
32     unsigned Indentation;
33     bool PrintInstantiation;
34 
35     raw_ostream& Indent() { return Indent(Indentation); }
36     raw_ostream& Indent(unsigned Indentation);
37     void ProcessDeclGroup(SmallVectorImpl<Decl*>& Decls);
38 
39     void Print(AccessSpecifier AS);
40 
41     /// Print an Objective-C method type in parentheses.
42     ///
43     /// \param Quals The Objective-C declaration qualifiers.
44     /// \param T The type to print.
45     void PrintObjCMethodType(ASTContext &Ctx, Decl::ObjCDeclQualifier Quals,
46                              QualType T);
47 
48     void PrintObjCTypeParams(ObjCTypeParamList *Params);
49 
50   public:
51     DeclPrinter(raw_ostream &Out, const PrintingPolicy &Policy,
52                 const ASTContext &Context, unsigned Indentation = 0,
53                 bool PrintInstantiation = false)
54         : Out(Out), Policy(Policy), Context(Context), Indentation(Indentation),
55           PrintInstantiation(PrintInstantiation) {}
56 
57     void VisitDeclContext(DeclContext *DC, bool Indent = true);
58 
59     void VisitTranslationUnitDecl(TranslationUnitDecl *D);
60     void VisitTypedefDecl(TypedefDecl *D);
61     void VisitTypeAliasDecl(TypeAliasDecl *D);
62     void VisitEnumDecl(EnumDecl *D);
63     void VisitRecordDecl(RecordDecl *D);
64     void VisitEnumConstantDecl(EnumConstantDecl *D);
65     void VisitEmptyDecl(EmptyDecl *D);
66     void VisitFunctionDecl(FunctionDecl *D);
67     void VisitFriendDecl(FriendDecl *D);
68     void VisitFieldDecl(FieldDecl *D);
69     void VisitVarDecl(VarDecl *D);
70     void VisitLabelDecl(LabelDecl *D);
71     void VisitParmVarDecl(ParmVarDecl *D);
72     void VisitFileScopeAsmDecl(FileScopeAsmDecl *D);
73     void VisitImportDecl(ImportDecl *D);
74     void VisitStaticAssertDecl(StaticAssertDecl *D);
75     void VisitNamespaceDecl(NamespaceDecl *D);
76     void VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
77     void VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
78     void VisitCXXRecordDecl(CXXRecordDecl *D);
79     void VisitLinkageSpecDecl(LinkageSpecDecl *D);
80     void VisitTemplateDecl(const TemplateDecl *D);
81     void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
82     void VisitClassTemplateDecl(ClassTemplateDecl *D);
83     void VisitClassTemplateSpecializationDecl(
84                                             ClassTemplateSpecializationDecl *D);
85     void VisitClassTemplatePartialSpecializationDecl(
86                                      ClassTemplatePartialSpecializationDecl *D);
87     void VisitObjCMethodDecl(ObjCMethodDecl *D);
88     void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
89     void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
90     void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
91     void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
92     void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
93     void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
94     void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
95     void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
96     void VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
97     void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
98     void VisitUsingDecl(UsingDecl *D);
99     void VisitUsingShadowDecl(UsingShadowDecl *D);
100     void VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D);
101     void VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D);
102     void VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D);
103 
104     void printTemplateParameters(const TemplateParameterList *Params);
105     void printTemplateArguments(const TemplateArgumentList &Args,
106                                 const TemplateParameterList *Params = nullptr);
107     void prettyPrintAttributes(Decl *D);
108     void prettyPrintPragmas(Decl *D);
109     void printDeclType(QualType T, StringRef DeclName, bool Pack = false);
110   };
111 }
112 
113 void Decl::print(raw_ostream &Out, unsigned Indentation,
114                  bool PrintInstantiation) const {
115   print(Out, getASTContext().getPrintingPolicy(), Indentation, PrintInstantiation);
116 }
117 
118 void Decl::print(raw_ostream &Out, const PrintingPolicy &Policy,
119                  unsigned Indentation, bool PrintInstantiation) const {
120   DeclPrinter Printer(Out, Policy, getASTContext(), Indentation,
121                       PrintInstantiation);
122   Printer.Visit(const_cast<Decl*>(this));
123 }
124 
125 static QualType GetBaseType(QualType T) {
126   // FIXME: This should be on the Type class!
127   QualType BaseType = T;
128   while (!BaseType->isSpecifierType()) {
129     if (isa<TypedefType>(BaseType))
130       break;
131     else if (const PointerType* PTy = BaseType->getAs<PointerType>())
132       BaseType = PTy->getPointeeType();
133     else if (const BlockPointerType *BPy = BaseType->getAs<BlockPointerType>())
134       BaseType = BPy->getPointeeType();
135     else if (const ArrayType* ATy = dyn_cast<ArrayType>(BaseType))
136       BaseType = ATy->getElementType();
137     else if (const FunctionType* FTy = BaseType->getAs<FunctionType>())
138       BaseType = FTy->getReturnType();
139     else if (const VectorType *VTy = BaseType->getAs<VectorType>())
140       BaseType = VTy->getElementType();
141     else if (const ReferenceType *RTy = BaseType->getAs<ReferenceType>())
142       BaseType = RTy->getPointeeType();
143     else if (const AutoType *ATy = BaseType->getAs<AutoType>())
144       BaseType = ATy->getDeducedType();
145     else
146       llvm_unreachable("Unknown declarator!");
147   }
148   return BaseType;
149 }
150 
151 static QualType getDeclType(Decl* D) {
152   if (TypedefNameDecl* TDD = dyn_cast<TypedefNameDecl>(D))
153     return TDD->getUnderlyingType();
154   if (ValueDecl* VD = dyn_cast<ValueDecl>(D))
155     return VD->getType();
156   return QualType();
157 }
158 
159 void Decl::printGroup(Decl** Begin, unsigned NumDecls,
160                       raw_ostream &Out, const PrintingPolicy &Policy,
161                       unsigned Indentation) {
162   if (NumDecls == 1) {
163     (*Begin)->print(Out, Policy, Indentation);
164     return;
165   }
166 
167   Decl** End = Begin + NumDecls;
168   TagDecl* TD = dyn_cast<TagDecl>(*Begin);
169   if (TD)
170     ++Begin;
171 
172   PrintingPolicy SubPolicy(Policy);
173 
174   bool isFirst = true;
175   for ( ; Begin != End; ++Begin) {
176     if (isFirst) {
177       if(TD)
178         SubPolicy.IncludeTagDefinition = true;
179       SubPolicy.SuppressSpecifiers = false;
180       isFirst = false;
181     } else {
182       if (!isFirst) Out << ", ";
183       SubPolicy.IncludeTagDefinition = false;
184       SubPolicy.SuppressSpecifiers = true;
185     }
186 
187     (*Begin)->print(Out, SubPolicy, Indentation);
188   }
189 }
190 
191 LLVM_DUMP_METHOD void DeclContext::dumpDeclContext() const {
192   // Get the translation unit
193   const DeclContext *DC = this;
194   while (!DC->isTranslationUnit())
195     DC = DC->getParent();
196 
197   ASTContext &Ctx = cast<TranslationUnitDecl>(DC)->getASTContext();
198   DeclPrinter Printer(llvm::errs(), Ctx.getPrintingPolicy(), Ctx, 0);
199   Printer.VisitDeclContext(const_cast<DeclContext *>(this), /*Indent=*/false);
200 }
201 
202 raw_ostream& DeclPrinter::Indent(unsigned Indentation) {
203   for (unsigned i = 0; i != Indentation; ++i)
204     Out << "  ";
205   return Out;
206 }
207 
208 void DeclPrinter::prettyPrintAttributes(Decl *D) {
209   if (Policy.PolishForDeclaration)
210     return;
211 
212   if (D->hasAttrs()) {
213     AttrVec &Attrs = D->getAttrs();
214     for (auto *A : Attrs) {
215       switch (A->getKind()) {
216 #define ATTR(X)
217 #define PRAGMA_SPELLING_ATTR(X) case attr::X:
218 #include "clang/Basic/AttrList.inc"
219         break;
220       default:
221         A->printPretty(Out, Policy);
222         break;
223       }
224     }
225   }
226 }
227 
228 void DeclPrinter::prettyPrintPragmas(Decl *D) {
229   if (Policy.PolishForDeclaration)
230     return;
231 
232   if (D->hasAttrs()) {
233     AttrVec &Attrs = D->getAttrs();
234     for (auto *A : Attrs) {
235       switch (A->getKind()) {
236 #define ATTR(X)
237 #define PRAGMA_SPELLING_ATTR(X) case attr::X:
238 #include "clang/Basic/AttrList.inc"
239         A->printPretty(Out, Policy);
240         Indent();
241         break;
242       default:
243         break;
244       }
245     }
246   }
247 }
248 
249 void DeclPrinter::printDeclType(QualType T, StringRef DeclName, bool Pack) {
250   // Normally, a PackExpansionType is written as T[3]... (for instance, as a
251   // template argument), but if it is the type of a declaration, the ellipsis
252   // is placed before the name being declared.
253   if (auto *PET = T->getAs<PackExpansionType>()) {
254     Pack = true;
255     T = PET->getPattern();
256   }
257   T.print(Out, Policy, (Pack ? "..." : "") + DeclName, Indentation);
258 }
259 
260 void DeclPrinter::ProcessDeclGroup(SmallVectorImpl<Decl*>& Decls) {
261   this->Indent();
262   Decl::printGroup(Decls.data(), Decls.size(), Out, Policy, Indentation);
263   Out << ";\n";
264   Decls.clear();
265 
266 }
267 
268 void DeclPrinter::Print(AccessSpecifier AS) {
269   switch(AS) {
270   case AS_none:      llvm_unreachable("No access specifier!");
271   case AS_public:    Out << "public"; break;
272   case AS_protected: Out << "protected"; break;
273   case AS_private:   Out << "private"; break;
274   }
275 }
276 
277 //----------------------------------------------------------------------------
278 // Common C declarations
279 //----------------------------------------------------------------------------
280 
281 void DeclPrinter::VisitDeclContext(DeclContext *DC, bool Indent) {
282   if (Policy.TerseOutput)
283     return;
284 
285   if (Indent)
286     Indentation += Policy.Indentation;
287 
288   SmallVector<Decl*, 2> Decls;
289   for (DeclContext::decl_iterator D = DC->decls_begin(), DEnd = DC->decls_end();
290        D != DEnd; ++D) {
291 
292     // Don't print ObjCIvarDecls, as they are printed when visiting the
293     // containing ObjCInterfaceDecl.
294     if (isa<ObjCIvarDecl>(*D))
295       continue;
296 
297     // Skip over implicit declarations in pretty-printing mode.
298     if (D->isImplicit())
299       continue;
300 
301     // Don't print implicit specializations, as they are printed when visiting
302     // corresponding templates.
303     if (auto FD = dyn_cast<FunctionDecl>(*D))
304       if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation &&
305           !isa<ClassTemplateSpecializationDecl>(DC))
306         continue;
307 
308     // The next bits of code handles stuff like "struct {int x;} a,b"; we're
309     // forced to merge the declarations because there's no other way to
310     // refer to the struct in question.  This limited merging is safe without
311     // a bunch of other checks because it only merges declarations directly
312     // referring to the tag, not typedefs.
313     //
314     // Check whether the current declaration should be grouped with a previous
315     // unnamed struct.
316     QualType CurDeclType = getDeclType(*D);
317     if (!Decls.empty() && !CurDeclType.isNull()) {
318       QualType BaseType = GetBaseType(CurDeclType);
319       if (!BaseType.isNull() && isa<ElaboratedType>(BaseType))
320         BaseType = cast<ElaboratedType>(BaseType)->getNamedType();
321       if (!BaseType.isNull() && isa<TagType>(BaseType) &&
322           cast<TagType>(BaseType)->getDecl() == Decls[0]) {
323         Decls.push_back(*D);
324         continue;
325       }
326     }
327 
328     // If we have a merged group waiting to be handled, handle it now.
329     if (!Decls.empty())
330       ProcessDeclGroup(Decls);
331 
332     // If the current declaration is an unnamed tag type, save it
333     // so we can merge it with the subsequent declaration(s) using it.
334     if (isa<TagDecl>(*D) && !cast<TagDecl>(*D)->getIdentifier()) {
335       Decls.push_back(*D);
336       continue;
337     }
338 
339     if (isa<AccessSpecDecl>(*D)) {
340       Indentation -= Policy.Indentation;
341       this->Indent();
342       Print(D->getAccess());
343       Out << ":\n";
344       Indentation += Policy.Indentation;
345       continue;
346     }
347 
348     this->Indent();
349     Visit(*D);
350 
351     // FIXME: Need to be able to tell the DeclPrinter when
352     const char *Terminator = nullptr;
353     if (isa<OMPThreadPrivateDecl>(*D) || isa<OMPDeclareReductionDecl>(*D))
354       Terminator = nullptr;
355     else if (isa<ObjCMethodDecl>(*D) && cast<ObjCMethodDecl>(*D)->hasBody())
356       Terminator = nullptr;
357     else if (auto FD = dyn_cast<FunctionDecl>(*D)) {
358       if (FD->isThisDeclarationADefinition())
359         Terminator = nullptr;
360       else
361         Terminator = ";";
362     } else if (auto TD = dyn_cast<FunctionTemplateDecl>(*D)) {
363       if (TD->getTemplatedDecl()->isThisDeclarationADefinition())
364         Terminator = nullptr;
365       else
366         Terminator = ";";
367     } else if (isa<NamespaceDecl>(*D) || isa<LinkageSpecDecl>(*D) ||
368              isa<ObjCImplementationDecl>(*D) ||
369              isa<ObjCInterfaceDecl>(*D) ||
370              isa<ObjCProtocolDecl>(*D) ||
371              isa<ObjCCategoryImplDecl>(*D) ||
372              isa<ObjCCategoryDecl>(*D))
373       Terminator = nullptr;
374     else if (isa<EnumConstantDecl>(*D)) {
375       DeclContext::decl_iterator Next = D;
376       ++Next;
377       if (Next != DEnd)
378         Terminator = ",";
379     } else
380       Terminator = ";";
381 
382     if (Terminator)
383       Out << Terminator;
384     if (!Policy.TerseOutput &&
385         ((isa<FunctionDecl>(*D) &&
386           cast<FunctionDecl>(*D)->doesThisDeclarationHaveABody()) ||
387          (isa<FunctionTemplateDecl>(*D) &&
388           cast<FunctionTemplateDecl>(*D)->getTemplatedDecl()->doesThisDeclarationHaveABody())))
389       ; // StmtPrinter already added '\n' after CompoundStmt.
390     else
391       Out << "\n";
392 
393     // Declare target attribute is special one, natural spelling for the pragma
394     // assumes "ending" construct so print it here.
395     if (D->hasAttr<OMPDeclareTargetDeclAttr>())
396       Out << "#pragma omp end declare target\n";
397   }
398 
399   if (!Decls.empty())
400     ProcessDeclGroup(Decls);
401 
402   if (Indent)
403     Indentation -= Policy.Indentation;
404 }
405 
406 void DeclPrinter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
407   VisitDeclContext(D, false);
408 }
409 
410 void DeclPrinter::VisitTypedefDecl(TypedefDecl *D) {
411   if (!Policy.SuppressSpecifiers) {
412     Out << "typedef ";
413 
414     if (D->isModulePrivate())
415       Out << "__module_private__ ";
416   }
417   QualType Ty = D->getTypeSourceInfo()->getType();
418   Ty.print(Out, Policy, D->getName(), Indentation);
419   prettyPrintAttributes(D);
420 }
421 
422 void DeclPrinter::VisitTypeAliasDecl(TypeAliasDecl *D) {
423   Out << "using " << *D;
424   prettyPrintAttributes(D);
425   Out << " = " << D->getTypeSourceInfo()->getType().getAsString(Policy);
426 }
427 
428 void DeclPrinter::VisitEnumDecl(EnumDecl *D) {
429   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
430     Out << "__module_private__ ";
431   Out << "enum ";
432   if (D->isScoped()) {
433     if (D->isScopedUsingClassTag())
434       Out << "class ";
435     else
436       Out << "struct ";
437   }
438   Out << *D;
439 
440   if (D->isFixed() && D->getASTContext().getLangOpts().CPlusPlus11)
441     Out << " : " << D->getIntegerType().stream(Policy);
442 
443   if (D->isCompleteDefinition()) {
444     Out << " {\n";
445     VisitDeclContext(D);
446     Indent() << "}";
447   }
448   prettyPrintAttributes(D);
449 }
450 
451 void DeclPrinter::VisitRecordDecl(RecordDecl *D) {
452   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
453     Out << "__module_private__ ";
454   Out << D->getKindName();
455 
456   prettyPrintAttributes(D);
457 
458   if (D->getIdentifier())
459     Out << ' ' << *D;
460 
461   if (D->isCompleteDefinition()) {
462     Out << " {\n";
463     VisitDeclContext(D);
464     Indent() << "}";
465   }
466 }
467 
468 void DeclPrinter::VisitEnumConstantDecl(EnumConstantDecl *D) {
469   Out << *D;
470   prettyPrintAttributes(D);
471   if (Expr *Init = D->getInitExpr()) {
472     Out << " = ";
473     Init->printPretty(Out, nullptr, Policy, Indentation, &Context);
474   }
475 }
476 
477 void DeclPrinter::VisitFunctionDecl(FunctionDecl *D) {
478   if (!D->getDescribedFunctionTemplate() &&
479       !D->isFunctionTemplateSpecialization())
480     prettyPrintPragmas(D);
481 
482   if (D->isFunctionTemplateSpecialization())
483     Out << "template<> ";
484   else if (!D->getDescribedFunctionTemplate()) {
485     for (unsigned I = 0, NumTemplateParams = D->getNumTemplateParameterLists();
486          I < NumTemplateParams; ++I)
487       printTemplateParameters(D->getTemplateParameterList(I));
488   }
489 
490   CXXConstructorDecl *CDecl = dyn_cast<CXXConstructorDecl>(D);
491   CXXConversionDecl *ConversionDecl = dyn_cast<CXXConversionDecl>(D);
492   CXXDeductionGuideDecl *GuideDecl = dyn_cast<CXXDeductionGuideDecl>(D);
493   if (!Policy.SuppressSpecifiers) {
494     switch (D->getStorageClass()) {
495     case SC_None: break;
496     case SC_Extern: Out << "extern "; break;
497     case SC_Static: Out << "static "; break;
498     case SC_PrivateExtern: Out << "__private_extern__ "; break;
499     case SC_Auto: case SC_Register:
500       llvm_unreachable("invalid for functions");
501     }
502 
503     if (D->isInlineSpecified())  Out << "inline ";
504     if (D->isVirtualAsWritten()) Out << "virtual ";
505     if (D->isModulePrivate())    Out << "__module_private__ ";
506     if (D->isConstexpr() && !D->isExplicitlyDefaulted()) Out << "constexpr ";
507     if ((CDecl && CDecl->isExplicitSpecified()) ||
508         (ConversionDecl && ConversionDecl->isExplicitSpecified()) ||
509         (GuideDecl && GuideDecl->isExplicitSpecified()))
510       Out << "explicit ";
511   }
512 
513   PrintingPolicy SubPolicy(Policy);
514   SubPolicy.SuppressSpecifiers = false;
515   std::string Proto;
516   if (!Policy.SuppressScope) {
517     if (const NestedNameSpecifier *NS = D->getQualifier()) {
518       llvm::raw_string_ostream OS(Proto);
519       NS->print(OS, Policy);
520     }
521   }
522   Proto += D->getNameInfo().getAsString();
523   if (GuideDecl)
524     Proto = GuideDecl->getDeducedTemplate()->getDeclName().getAsString();
525   if (const TemplateArgumentList *TArgs = D->getTemplateSpecializationArgs()) {
526     llvm::raw_string_ostream POut(Proto);
527     DeclPrinter TArgPrinter(POut, SubPolicy, Context, Indentation);
528     TArgPrinter.printTemplateArguments(*TArgs);
529   }
530 
531   QualType Ty = D->getType();
532   while (const ParenType *PT = dyn_cast<ParenType>(Ty)) {
533     Proto = '(' + Proto + ')';
534     Ty = PT->getInnerType();
535   }
536 
537   if (const FunctionType *AFT = Ty->getAs<FunctionType>()) {
538     const FunctionProtoType *FT = nullptr;
539     if (D->hasWrittenPrototype())
540       FT = dyn_cast<FunctionProtoType>(AFT);
541 
542     Proto += "(";
543     if (FT) {
544       llvm::raw_string_ostream POut(Proto);
545       DeclPrinter ParamPrinter(POut, SubPolicy, Context, Indentation);
546       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
547         if (i) POut << ", ";
548         ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
549       }
550 
551       if (FT->isVariadic()) {
552         if (D->getNumParams()) POut << ", ";
553         POut << "...";
554       }
555     } else if (D->doesThisDeclarationHaveABody() && !D->hasPrototype()) {
556       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
557         if (i)
558           Proto += ", ";
559         Proto += D->getParamDecl(i)->getNameAsString();
560       }
561     }
562 
563     Proto += ")";
564 
565     if (FT) {
566       if (FT->isConst())
567         Proto += " const";
568       if (FT->isVolatile())
569         Proto += " volatile";
570       if (FT->isRestrict())
571         Proto += " restrict";
572 
573       switch (FT->getRefQualifier()) {
574       case RQ_None:
575         break;
576       case RQ_LValue:
577         Proto += " &";
578         break;
579       case RQ_RValue:
580         Proto += " &&";
581         break;
582       }
583     }
584 
585     if (FT && FT->hasDynamicExceptionSpec()) {
586       Proto += " throw(";
587       if (FT->getExceptionSpecType() == EST_MSAny)
588         Proto += "...";
589       else
590         for (unsigned I = 0, N = FT->getNumExceptions(); I != N; ++I) {
591           if (I)
592             Proto += ", ";
593 
594           Proto += FT->getExceptionType(I).getAsString(SubPolicy);
595         }
596       Proto += ")";
597     } else if (FT && isNoexceptExceptionSpec(FT->getExceptionSpecType())) {
598       Proto += " noexcept";
599       if (FT->getExceptionSpecType() == EST_ComputedNoexcept) {
600         Proto += "(";
601         llvm::raw_string_ostream EOut(Proto);
602         FT->getNoexceptExpr()->printPretty(EOut, nullptr, SubPolicy,
603                                            Indentation);
604         EOut.flush();
605         Proto += EOut.str();
606         Proto += ")";
607       }
608     }
609 
610     if (CDecl) {
611       bool HasInitializerList = false;
612       for (const auto *BMInitializer : CDecl->inits()) {
613         if (BMInitializer->isInClassMemberInitializer())
614           continue;
615 
616         if (!HasInitializerList) {
617           Proto += " : ";
618           Out << Proto;
619           Proto.clear();
620           HasInitializerList = true;
621         } else
622           Out << ", ";
623 
624         if (BMInitializer->isAnyMemberInitializer()) {
625           FieldDecl *FD = BMInitializer->getAnyMember();
626           Out << *FD;
627         } else {
628           Out << QualType(BMInitializer->getBaseClass(), 0).getAsString(Policy);
629         }
630 
631         Out << "(";
632         if (!BMInitializer->getInit()) {
633           // Nothing to print
634         } else {
635           Expr *Init = BMInitializer->getInit();
636           if (ExprWithCleanups *Tmp = dyn_cast<ExprWithCleanups>(Init))
637             Init = Tmp->getSubExpr();
638 
639           Init = Init->IgnoreParens();
640 
641           Expr *SimpleInit = nullptr;
642           Expr **Args = nullptr;
643           unsigned NumArgs = 0;
644           if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
645             Args = ParenList->getExprs();
646             NumArgs = ParenList->getNumExprs();
647           } else if (CXXConstructExpr *Construct
648                                         = dyn_cast<CXXConstructExpr>(Init)) {
649             Args = Construct->getArgs();
650             NumArgs = Construct->getNumArgs();
651           } else
652             SimpleInit = Init;
653 
654           if (SimpleInit)
655             SimpleInit->printPretty(Out, nullptr, Policy, Indentation);
656           else {
657             for (unsigned I = 0; I != NumArgs; ++I) {
658               assert(Args[I] != nullptr && "Expected non-null Expr");
659               if (isa<CXXDefaultArgExpr>(Args[I]))
660                 break;
661 
662               if (I)
663                 Out << ", ";
664               Args[I]->printPretty(Out, nullptr, Policy, Indentation);
665             }
666           }
667         }
668         Out << ")";
669         if (BMInitializer->isPackExpansion())
670           Out << "...";
671       }
672     } else if (!ConversionDecl && !isa<CXXDestructorDecl>(D)) {
673       if (FT && FT->hasTrailingReturn()) {
674         if (!GuideDecl)
675           Out << "auto ";
676         Out << Proto << " -> ";
677         Proto.clear();
678       }
679       AFT->getReturnType().print(Out, Policy, Proto);
680       Proto.clear();
681     }
682     Out << Proto;
683   } else {
684     Ty.print(Out, Policy, Proto);
685   }
686 
687   prettyPrintAttributes(D);
688 
689   if (D->isPure())
690     Out << " = 0";
691   else if (D->isDeletedAsWritten())
692     Out << " = delete";
693   else if (D->isExplicitlyDefaulted())
694     Out << " = default";
695   else if (D->doesThisDeclarationHaveABody()) {
696     if (!Policy.TerseOutput) {
697       if (!D->hasPrototype() && D->getNumParams()) {
698         // This is a K&R function definition, so we need to print the
699         // parameters.
700         Out << '\n';
701         DeclPrinter ParamPrinter(Out, SubPolicy, Context, Indentation);
702         Indentation += Policy.Indentation;
703         for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
704           Indent();
705           ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
706           Out << ";\n";
707         }
708         Indentation -= Policy.Indentation;
709       } else
710         Out << ' ';
711 
712       if (D->getBody())
713         D->getBody()->printPretty(Out, nullptr, SubPolicy, Indentation);
714     } else {
715       if (isa<CXXConstructorDecl>(*D))
716         Out << " {}";
717     }
718   }
719 }
720 
721 void DeclPrinter::VisitFriendDecl(FriendDecl *D) {
722   if (TypeSourceInfo *TSI = D->getFriendType()) {
723     unsigned NumTPLists = D->getFriendTypeNumTemplateParameterLists();
724     for (unsigned i = 0; i < NumTPLists; ++i)
725       printTemplateParameters(D->getFriendTypeTemplateParameterList(i));
726     Out << "friend ";
727     Out << " " << TSI->getType().getAsString(Policy);
728   }
729   else if (FunctionDecl *FD =
730       dyn_cast<FunctionDecl>(D->getFriendDecl())) {
731     Out << "friend ";
732     VisitFunctionDecl(FD);
733   }
734   else if (FunctionTemplateDecl *FTD =
735            dyn_cast<FunctionTemplateDecl>(D->getFriendDecl())) {
736     Out << "friend ";
737     VisitFunctionTemplateDecl(FTD);
738   }
739   else if (ClassTemplateDecl *CTD =
740            dyn_cast<ClassTemplateDecl>(D->getFriendDecl())) {
741     Out << "friend ";
742     VisitRedeclarableTemplateDecl(CTD);
743   }
744 }
745 
746 void DeclPrinter::VisitFieldDecl(FieldDecl *D) {
747   // FIXME: add printing of pragma attributes if required.
748   if (!Policy.SuppressSpecifiers && D->isMutable())
749     Out << "mutable ";
750   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
751     Out << "__module_private__ ";
752 
753   Out << D->getASTContext().getUnqualifiedObjCPointerType(D->getType()).
754          stream(Policy, D->getName(), Indentation);
755 
756   if (D->isBitField()) {
757     Out << " : ";
758     D->getBitWidth()->printPretty(Out, nullptr, Policy, Indentation);
759   }
760 
761   Expr *Init = D->getInClassInitializer();
762   if (!Policy.SuppressInitializers && Init) {
763     if (D->getInClassInitStyle() == ICIS_ListInit)
764       Out << " ";
765     else
766       Out << " = ";
767     Init->printPretty(Out, nullptr, Policy, Indentation);
768   }
769   prettyPrintAttributes(D);
770 }
771 
772 void DeclPrinter::VisitLabelDecl(LabelDecl *D) {
773   Out << *D << ":";
774 }
775 
776 void DeclPrinter::VisitVarDecl(VarDecl *D) {
777   prettyPrintPragmas(D);
778 
779   QualType T = D->getTypeSourceInfo()
780     ? D->getTypeSourceInfo()->getType()
781     : D->getASTContext().getUnqualifiedObjCPointerType(D->getType());
782 
783   if (!Policy.SuppressSpecifiers) {
784     StorageClass SC = D->getStorageClass();
785     if (SC != SC_None)
786       Out << VarDecl::getStorageClassSpecifierString(SC) << " ";
787 
788     switch (D->getTSCSpec()) {
789     case TSCS_unspecified:
790       break;
791     case TSCS___thread:
792       Out << "__thread ";
793       break;
794     case TSCS__Thread_local:
795       Out << "_Thread_local ";
796       break;
797     case TSCS_thread_local:
798       Out << "thread_local ";
799       break;
800     }
801 
802     if (D->isModulePrivate())
803       Out << "__module_private__ ";
804 
805     if (D->isConstexpr()) {
806       Out << "constexpr ";
807       T.removeLocalConst();
808     }
809   }
810 
811   printDeclType(T, D->getName());
812   Expr *Init = D->getInit();
813   if (!Policy.SuppressInitializers && Init) {
814     bool ImplicitInit = false;
815     if (CXXConstructExpr *Construct =
816             dyn_cast<CXXConstructExpr>(Init->IgnoreImplicit())) {
817       if (D->getInitStyle() == VarDecl::CallInit &&
818           !Construct->isListInitialization()) {
819         ImplicitInit = Construct->getNumArgs() == 0 ||
820           Construct->getArg(0)->isDefaultArgument();
821       }
822     }
823     if (!ImplicitInit) {
824       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
825         Out << "(";
826       else if (D->getInitStyle() == VarDecl::CInit) {
827         Out << " = ";
828       }
829       PrintingPolicy SubPolicy(Policy);
830       SubPolicy.SuppressSpecifiers = false;
831       SubPolicy.IncludeTagDefinition = false;
832       Init->printPretty(Out, nullptr, SubPolicy, Indentation);
833       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
834         Out << ")";
835     }
836   }
837   prettyPrintAttributes(D);
838 }
839 
840 void DeclPrinter::VisitParmVarDecl(ParmVarDecl *D) {
841   VisitVarDecl(D);
842 }
843 
844 void DeclPrinter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
845   Out << "__asm (";
846   D->getAsmString()->printPretty(Out, nullptr, Policy, Indentation);
847   Out << ")";
848 }
849 
850 void DeclPrinter::VisitImportDecl(ImportDecl *D) {
851   Out << "@import " << D->getImportedModule()->getFullModuleName()
852       << ";\n";
853 }
854 
855 void DeclPrinter::VisitStaticAssertDecl(StaticAssertDecl *D) {
856   Out << "static_assert(";
857   D->getAssertExpr()->printPretty(Out, nullptr, Policy, Indentation);
858   if (StringLiteral *SL = D->getMessage()) {
859     Out << ", ";
860     SL->printPretty(Out, nullptr, Policy, Indentation);
861   }
862   Out << ")";
863 }
864 
865 //----------------------------------------------------------------------------
866 // C++ declarations
867 //----------------------------------------------------------------------------
868 void DeclPrinter::VisitNamespaceDecl(NamespaceDecl *D) {
869   if (D->isInline())
870     Out << "inline ";
871   Out << "namespace " << *D << " {\n";
872   VisitDeclContext(D);
873   Indent() << "}";
874 }
875 
876 void DeclPrinter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
877   Out << "using namespace ";
878   if (D->getQualifier())
879     D->getQualifier()->print(Out, Policy);
880   Out << *D->getNominatedNamespaceAsWritten();
881 }
882 
883 void DeclPrinter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
884   Out << "namespace " << *D << " = ";
885   if (D->getQualifier())
886     D->getQualifier()->print(Out, Policy);
887   Out << *D->getAliasedNamespace();
888 }
889 
890 void DeclPrinter::VisitEmptyDecl(EmptyDecl *D) {
891   prettyPrintAttributes(D);
892 }
893 
894 void DeclPrinter::VisitCXXRecordDecl(CXXRecordDecl *D) {
895   // FIXME: add printing of pragma attributes if required.
896   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
897     Out << "__module_private__ ";
898   Out << D->getKindName();
899 
900   prettyPrintAttributes(D);
901 
902   if (D->getIdentifier()) {
903     Out << ' ' << *D;
904 
905     if (auto S = dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
906       printTemplateArguments(S->getTemplateArgs(), S->getTemplateParameters());
907     else if (auto S = dyn_cast<ClassTemplateSpecializationDecl>(D))
908       printTemplateArguments(S->getTemplateArgs());
909   }
910 
911   if (D->isCompleteDefinition()) {
912     // Print the base classes
913     if (D->getNumBases()) {
914       Out << " : ";
915       for (CXXRecordDecl::base_class_iterator Base = D->bases_begin(),
916              BaseEnd = D->bases_end(); Base != BaseEnd; ++Base) {
917         if (Base != D->bases_begin())
918           Out << ", ";
919 
920         if (Base->isVirtual())
921           Out << "virtual ";
922 
923         AccessSpecifier AS = Base->getAccessSpecifierAsWritten();
924         if (AS != AS_none) {
925           Print(AS);
926           Out << " ";
927         }
928         Out << Base->getType().getAsString(Policy);
929 
930         if (Base->isPackExpansion())
931           Out << "...";
932       }
933     }
934 
935     // Print the class definition
936     // FIXME: Doesn't print access specifiers, e.g., "public:"
937     if (Policy.TerseOutput) {
938       Out << " {}";
939     } else {
940       Out << " {\n";
941       VisitDeclContext(D);
942       Indent() << "}";
943     }
944   }
945 }
946 
947 void DeclPrinter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
948   const char *l;
949   if (D->getLanguage() == LinkageSpecDecl::lang_c)
950     l = "C";
951   else {
952     assert(D->getLanguage() == LinkageSpecDecl::lang_cxx &&
953            "unknown language in linkage specification");
954     l = "C++";
955   }
956 
957   Out << "extern \"" << l << "\" ";
958   if (D->hasBraces()) {
959     Out << "{\n";
960     VisitDeclContext(D);
961     Indent() << "}";
962   } else
963     Visit(*D->decls_begin());
964 }
965 
966 void DeclPrinter::printTemplateParameters(const TemplateParameterList *Params) {
967   assert(Params);
968 
969   Out << "template <";
970 
971   for (unsigned i = 0, e = Params->size(); i != e; ++i) {
972     if (i != 0)
973       Out << ", ";
974 
975     const Decl *Param = Params->getParam(i);
976     if (auto TTP = dyn_cast<TemplateTypeParmDecl>(Param)) {
977 
978       if (TTP->wasDeclaredWithTypename())
979         Out << "typename ";
980       else
981         Out << "class ";
982 
983       if (TTP->isParameterPack())
984         Out << "...";
985 
986       Out << *TTP;
987 
988       if (TTP->hasDefaultArgument()) {
989         Out << " = ";
990         Out << TTP->getDefaultArgument().getAsString(Policy);
991       };
992     } else if (auto NTTP = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
993       StringRef Name;
994       if (IdentifierInfo *II = NTTP->getIdentifier())
995         Name = II->getName();
996       printDeclType(NTTP->getType(), Name, NTTP->isParameterPack());
997 
998       if (NTTP->hasDefaultArgument()) {
999         Out << " = ";
1000         NTTP->getDefaultArgument()->printPretty(Out, nullptr, Policy,
1001                                                 Indentation);
1002       }
1003     } else if (auto TTPD = dyn_cast<TemplateTemplateParmDecl>(Param)) {
1004       VisitTemplateDecl(TTPD);
1005       // FIXME: print the default argument, if present.
1006     }
1007   }
1008 
1009   Out << "> ";
1010 }
1011 
1012 void DeclPrinter::printTemplateArguments(const TemplateArgumentList &Args,
1013                                          const TemplateParameterList *Params) {
1014   Out << "<";
1015   for (size_t I = 0, E = Args.size(); I < E; ++I) {
1016     const TemplateArgument &A = Args[I];
1017     if (I)
1018       Out << ", ";
1019     if (Params) {
1020       if (A.getKind() == TemplateArgument::Type)
1021         if (auto T = A.getAsType()->getAs<TemplateTypeParmType>()) {
1022           auto P = cast<TemplateTypeParmDecl>(Params->getParam(T->getIndex()));
1023           Out << *P;
1024           continue;
1025         }
1026       if (A.getKind() == TemplateArgument::Template) {
1027         if (auto T = A.getAsTemplate().getAsTemplateDecl())
1028           if (auto TD = dyn_cast<TemplateTemplateParmDecl>(T)) {
1029             auto P = cast<TemplateTemplateParmDecl>(
1030                                               Params->getParam(TD->getIndex()));
1031             Out << *P;
1032             continue;
1033           }
1034       }
1035       if (A.getKind() == TemplateArgument::Expression) {
1036         if (auto E = dyn_cast<DeclRefExpr>(A.getAsExpr()))
1037           if (auto N = dyn_cast<NonTypeTemplateParmDecl>(E->getDecl())) {
1038             auto P = cast<NonTypeTemplateParmDecl>(
1039                                                Params->getParam(N->getIndex()));
1040             Out << *P;
1041             continue;
1042           }
1043       }
1044     }
1045     A.print(Policy, Out);
1046   }
1047   Out << ">";
1048 }
1049 
1050 void DeclPrinter::VisitTemplateDecl(const TemplateDecl *D) {
1051   printTemplateParameters(D->getTemplateParameters());
1052 
1053   if (const TemplateTemplateParmDecl *TTP =
1054         dyn_cast<TemplateTemplateParmDecl>(D)) {
1055     Out << "class ";
1056     if (TTP->isParameterPack())
1057       Out << "...";
1058     Out << D->getName();
1059   } else {
1060     Visit(D->getTemplatedDecl());
1061   }
1062 }
1063 
1064 void DeclPrinter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1065   prettyPrintPragmas(D->getTemplatedDecl());
1066   // Print any leading template parameter lists.
1067   if (const FunctionDecl *FD = D->getTemplatedDecl()) {
1068     for (unsigned I = 0, NumTemplateParams = FD->getNumTemplateParameterLists();
1069          I < NumTemplateParams; ++I)
1070       printTemplateParameters(FD->getTemplateParameterList(I));
1071   }
1072   VisitRedeclarableTemplateDecl(D);
1073 
1074   // Never print "instantiations" for deduction guides (they don't really
1075   // have them).
1076   if (PrintInstantiation &&
1077       !isa<CXXDeductionGuideDecl>(D->getTemplatedDecl())) {
1078     FunctionDecl *PrevDecl = D->getTemplatedDecl();
1079     const FunctionDecl *Def;
1080     if (PrevDecl->isDefined(Def) && Def != PrevDecl)
1081       return;
1082     for (auto *I : D->specializations())
1083       if (I->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) {
1084         if (!PrevDecl->isThisDeclarationADefinition())
1085           Out << ";\n";
1086         Indent();
1087         prettyPrintPragmas(I);
1088         Visit(I);
1089       }
1090   }
1091 }
1092 
1093 void DeclPrinter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1094   VisitRedeclarableTemplateDecl(D);
1095 
1096   if (PrintInstantiation) {
1097     for (auto *I : D->specializations())
1098       if (I->getSpecializationKind() == TSK_ImplicitInstantiation) {
1099         if (D->isThisDeclarationADefinition())
1100           Out << ";";
1101         Out << "\n";
1102         Visit(I);
1103       }
1104   }
1105 }
1106 
1107 void DeclPrinter::VisitClassTemplateSpecializationDecl(
1108                                            ClassTemplateSpecializationDecl *D) {
1109   Out << "template<> ";
1110   VisitCXXRecordDecl(D);
1111 }
1112 
1113 void DeclPrinter::VisitClassTemplatePartialSpecializationDecl(
1114                                     ClassTemplatePartialSpecializationDecl *D) {
1115   printTemplateParameters(D->getTemplateParameters());
1116   VisitCXXRecordDecl(D);
1117 }
1118 
1119 //----------------------------------------------------------------------------
1120 // Objective-C declarations
1121 //----------------------------------------------------------------------------
1122 
1123 void DeclPrinter::PrintObjCMethodType(ASTContext &Ctx,
1124                                       Decl::ObjCDeclQualifier Quals,
1125                                       QualType T) {
1126   Out << '(';
1127   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_In)
1128     Out << "in ";
1129   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Inout)
1130     Out << "inout ";
1131   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Out)
1132     Out << "out ";
1133   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Bycopy)
1134     Out << "bycopy ";
1135   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Byref)
1136     Out << "byref ";
1137   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Oneway)
1138     Out << "oneway ";
1139   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_CSNullability) {
1140     if (auto nullability = AttributedType::stripOuterNullability(T))
1141       Out << getNullabilitySpelling(*nullability, true) << ' ';
1142   }
1143 
1144   Out << Ctx.getUnqualifiedObjCPointerType(T).getAsString(Policy);
1145   Out << ')';
1146 }
1147 
1148 void DeclPrinter::PrintObjCTypeParams(ObjCTypeParamList *Params) {
1149   Out << "<";
1150   unsigned First = true;
1151   for (auto *Param : *Params) {
1152     if (First) {
1153       First = false;
1154     } else {
1155       Out << ", ";
1156     }
1157 
1158     switch (Param->getVariance()) {
1159     case ObjCTypeParamVariance::Invariant:
1160       break;
1161 
1162     case ObjCTypeParamVariance::Covariant:
1163       Out << "__covariant ";
1164       break;
1165 
1166     case ObjCTypeParamVariance::Contravariant:
1167       Out << "__contravariant ";
1168       break;
1169     }
1170 
1171     Out << Param->getDeclName().getAsString();
1172 
1173     if (Param->hasExplicitBound()) {
1174       Out << " : " << Param->getUnderlyingType().getAsString(Policy);
1175     }
1176   }
1177   Out << ">";
1178 }
1179 
1180 void DeclPrinter::VisitObjCMethodDecl(ObjCMethodDecl *OMD) {
1181   if (OMD->isInstanceMethod())
1182     Out << "- ";
1183   else
1184     Out << "+ ";
1185   if (!OMD->getReturnType().isNull()) {
1186     PrintObjCMethodType(OMD->getASTContext(), OMD->getObjCDeclQualifier(),
1187                         OMD->getReturnType());
1188   }
1189 
1190   std::string name = OMD->getSelector().getAsString();
1191   std::string::size_type pos, lastPos = 0;
1192   for (const auto *PI : OMD->parameters()) {
1193     // FIXME: selector is missing here!
1194     pos = name.find_first_of(':', lastPos);
1195     if (lastPos != 0)
1196       Out << " ";
1197     Out << name.substr(lastPos, pos - lastPos) << ':';
1198     PrintObjCMethodType(OMD->getASTContext(),
1199                         PI->getObjCDeclQualifier(),
1200                         PI->getType());
1201     Out << *PI;
1202     lastPos = pos + 1;
1203   }
1204 
1205   if (OMD->param_begin() == OMD->param_end())
1206     Out << name;
1207 
1208   if (OMD->isVariadic())
1209       Out << ", ...";
1210 
1211   prettyPrintAttributes(OMD);
1212 
1213   if (OMD->getBody() && !Policy.TerseOutput) {
1214     Out << ' ';
1215     OMD->getBody()->printPretty(Out, nullptr, Policy);
1216   }
1217   else if (Policy.PolishForDeclaration)
1218     Out << ';';
1219 }
1220 
1221 void DeclPrinter::VisitObjCImplementationDecl(ObjCImplementationDecl *OID) {
1222   std::string I = OID->getNameAsString();
1223   ObjCInterfaceDecl *SID = OID->getSuperClass();
1224 
1225   bool eolnOut = false;
1226   if (SID)
1227     Out << "@implementation " << I << " : " << *SID;
1228   else
1229     Out << "@implementation " << I;
1230 
1231   if (OID->ivar_size() > 0) {
1232     Out << "{\n";
1233     eolnOut = true;
1234     Indentation += Policy.Indentation;
1235     for (const auto *I : OID->ivars()) {
1236       Indent() << I->getASTContext().getUnqualifiedObjCPointerType(I->getType()).
1237                     getAsString(Policy) << ' ' << *I << ";\n";
1238     }
1239     Indentation -= Policy.Indentation;
1240     Out << "}\n";
1241   }
1242   else if (SID || (OID->decls_begin() != OID->decls_end())) {
1243     Out << "\n";
1244     eolnOut = true;
1245   }
1246   VisitDeclContext(OID, false);
1247   if (!eolnOut)
1248     Out << "\n";
1249   Out << "@end";
1250 }
1251 
1252 void DeclPrinter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *OID) {
1253   std::string I = OID->getNameAsString();
1254   ObjCInterfaceDecl *SID = OID->getSuperClass();
1255 
1256   if (!OID->isThisDeclarationADefinition()) {
1257     Out << "@class " << I;
1258 
1259     if (auto TypeParams = OID->getTypeParamListAsWritten()) {
1260       PrintObjCTypeParams(TypeParams);
1261     }
1262 
1263     Out << ";";
1264     return;
1265   }
1266   bool eolnOut = false;
1267   Out << "@interface " << I;
1268 
1269   if (auto TypeParams = OID->getTypeParamListAsWritten()) {
1270     PrintObjCTypeParams(TypeParams);
1271   }
1272 
1273   if (SID)
1274     Out << " : " << QualType(OID->getSuperClassType(), 0).getAsString(Policy);
1275 
1276   // Protocols?
1277   const ObjCList<ObjCProtocolDecl> &Protocols = OID->getReferencedProtocols();
1278   if (!Protocols.empty()) {
1279     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
1280          E = Protocols.end(); I != E; ++I)
1281       Out << (I == Protocols.begin() ? '<' : ',') << **I;
1282     Out << "> ";
1283   }
1284 
1285   if (OID->ivar_size() > 0) {
1286     Out << "{\n";
1287     eolnOut = true;
1288     Indentation += Policy.Indentation;
1289     for (const auto *I : OID->ivars()) {
1290       Indent() << I->getASTContext()
1291                       .getUnqualifiedObjCPointerType(I->getType())
1292                       .getAsString(Policy) << ' ' << *I << ";\n";
1293     }
1294     Indentation -= Policy.Indentation;
1295     Out << "}\n";
1296   }
1297   else if (SID || (OID->decls_begin() != OID->decls_end())) {
1298     Out << "\n";
1299     eolnOut = true;
1300   }
1301 
1302   VisitDeclContext(OID, false);
1303   if (!eolnOut)
1304     Out << "\n";
1305   Out << "@end";
1306   // FIXME: implement the rest...
1307 }
1308 
1309 void DeclPrinter::VisitObjCProtocolDecl(ObjCProtocolDecl *PID) {
1310   if (!PID->isThisDeclarationADefinition()) {
1311     Out << "@protocol " << *PID << ";\n";
1312     return;
1313   }
1314   // Protocols?
1315   const ObjCList<ObjCProtocolDecl> &Protocols = PID->getReferencedProtocols();
1316   if (!Protocols.empty()) {
1317     Out << "@protocol " << *PID;
1318     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
1319          E = Protocols.end(); I != E; ++I)
1320       Out << (I == Protocols.begin() ? '<' : ',') << **I;
1321     Out << ">\n";
1322   } else
1323     Out << "@protocol " << *PID << '\n';
1324   VisitDeclContext(PID, false);
1325   Out << "@end";
1326 }
1327 
1328 void DeclPrinter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *PID) {
1329   Out << "@implementation " << *PID->getClassInterface() << '(' << *PID <<")\n";
1330 
1331   VisitDeclContext(PID, false);
1332   Out << "@end";
1333   // FIXME: implement the rest...
1334 }
1335 
1336 void DeclPrinter::VisitObjCCategoryDecl(ObjCCategoryDecl *PID) {
1337   Out << "@interface " << *PID->getClassInterface();
1338   if (auto TypeParams = PID->getTypeParamList()) {
1339     PrintObjCTypeParams(TypeParams);
1340   }
1341   Out << "(" << *PID << ")\n";
1342   if (PID->ivar_size() > 0) {
1343     Out << "{\n";
1344     Indentation += Policy.Indentation;
1345     for (const auto *I : PID->ivars())
1346       Indent() << I->getASTContext().getUnqualifiedObjCPointerType(I->getType()).
1347                     getAsString(Policy) << ' ' << *I << ";\n";
1348     Indentation -= Policy.Indentation;
1349     Out << "}\n";
1350   }
1351 
1352   VisitDeclContext(PID, false);
1353   Out << "@end";
1354 
1355   // FIXME: implement the rest...
1356 }
1357 
1358 void DeclPrinter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *AID) {
1359   Out << "@compatibility_alias " << *AID
1360       << ' ' << *AID->getClassInterface() << ";\n";
1361 }
1362 
1363 /// PrintObjCPropertyDecl - print a property declaration.
1364 ///
1365 void DeclPrinter::VisitObjCPropertyDecl(ObjCPropertyDecl *PDecl) {
1366   if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Required)
1367     Out << "@required\n";
1368   else if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Optional)
1369     Out << "@optional\n";
1370 
1371   QualType T = PDecl->getType();
1372 
1373   Out << "@property";
1374   if (PDecl->getPropertyAttributes() != ObjCPropertyDecl::OBJC_PR_noattr) {
1375     bool first = true;
1376     Out << " (";
1377     if (PDecl->getPropertyAttributes() &
1378         ObjCPropertyDecl::OBJC_PR_readonly) {
1379       Out << (first ? ' ' : ',') << "readonly";
1380       first = false;
1381     }
1382 
1383     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) {
1384       Out << (first ? ' ' : ',') << "getter = ";
1385       PDecl->getGetterName().print(Out);
1386       first = false;
1387     }
1388     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) {
1389       Out << (first ? ' ' : ',') << "setter = ";
1390       PDecl->getSetterName().print(Out);
1391       first = false;
1392     }
1393 
1394     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_assign) {
1395       Out << (first ? ' ' : ',') << "assign";
1396       first = false;
1397     }
1398 
1399     if (PDecl->getPropertyAttributes() &
1400         ObjCPropertyDecl::OBJC_PR_readwrite) {
1401       Out << (first ? ' ' : ',') << "readwrite";
1402       first = false;
1403     }
1404 
1405     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_retain) {
1406       Out << (first ? ' ' : ',') << "retain";
1407       first = false;
1408     }
1409 
1410     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_strong) {
1411       Out << (first ? ' ' : ',') << "strong";
1412       first = false;
1413     }
1414 
1415     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_copy) {
1416       Out << (first ? ' ' : ',') << "copy";
1417       first = false;
1418     }
1419 
1420     if (PDecl->getPropertyAttributes() &
1421         ObjCPropertyDecl::OBJC_PR_nonatomic) {
1422       Out << (first ? ' ' : ',') << "nonatomic";
1423       first = false;
1424     }
1425     if (PDecl->getPropertyAttributes() &
1426         ObjCPropertyDecl::OBJC_PR_atomic) {
1427       Out << (first ? ' ' : ',') << "atomic";
1428       first = false;
1429     }
1430 
1431     if (PDecl->getPropertyAttributes() &
1432         ObjCPropertyDecl::OBJC_PR_nullability) {
1433       if (auto nullability = AttributedType::stripOuterNullability(T)) {
1434         if (*nullability == NullabilityKind::Unspecified &&
1435             (PDecl->getPropertyAttributes() &
1436                ObjCPropertyDecl::OBJC_PR_null_resettable)) {
1437           Out << (first ? ' ' : ',') << "null_resettable";
1438         } else {
1439           Out << (first ? ' ' : ',')
1440               << getNullabilitySpelling(*nullability, true);
1441         }
1442         first = false;
1443       }
1444     }
1445 
1446     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_class) {
1447       Out << (first ? ' ' : ',') << "class";
1448       first = false;
1449     }
1450 
1451     (void) first; // Silence dead store warning due to idiomatic code.
1452     Out << " )";
1453   }
1454   Out << ' ' << PDecl->getASTContext().getUnqualifiedObjCPointerType(T).
1455                   getAsString(Policy) << ' ' << *PDecl;
1456   if (Policy.PolishForDeclaration)
1457     Out << ';';
1458 }
1459 
1460 void DeclPrinter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *PID) {
1461   if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize)
1462     Out << "@synthesize ";
1463   else
1464     Out << "@dynamic ";
1465   Out << *PID->getPropertyDecl();
1466   if (PID->getPropertyIvarDecl())
1467     Out << '=' << *PID->getPropertyIvarDecl();
1468 }
1469 
1470 void DeclPrinter::VisitUsingDecl(UsingDecl *D) {
1471   if (!D->isAccessDeclaration())
1472     Out << "using ";
1473   if (D->hasTypename())
1474     Out << "typename ";
1475   D->getQualifier()->print(Out, Policy);
1476 
1477   // Use the correct record name when the using declaration is used for
1478   // inheriting constructors.
1479   for (const auto *Shadow : D->shadows()) {
1480     if (const auto *ConstructorShadow =
1481             dyn_cast<ConstructorUsingShadowDecl>(Shadow)) {
1482       assert(Shadow->getDeclContext() == ConstructorShadow->getDeclContext());
1483       Out << *ConstructorShadow->getNominatedBaseClass();
1484       return;
1485     }
1486   }
1487   Out << *D;
1488 }
1489 
1490 void
1491 DeclPrinter::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) {
1492   Out << "using typename ";
1493   D->getQualifier()->print(Out, Policy);
1494   Out << D->getDeclName();
1495 }
1496 
1497 void DeclPrinter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1498   if (!D->isAccessDeclaration())
1499     Out << "using ";
1500   D->getQualifier()->print(Out, Policy);
1501   Out << D->getDeclName();
1502 }
1503 
1504 void DeclPrinter::VisitUsingShadowDecl(UsingShadowDecl *D) {
1505   // ignore
1506 }
1507 
1508 void DeclPrinter::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
1509   Out << "#pragma omp threadprivate";
1510   if (!D->varlist_empty()) {
1511     for (OMPThreadPrivateDecl::varlist_iterator I = D->varlist_begin(),
1512                                                 E = D->varlist_end();
1513                                                 I != E; ++I) {
1514       Out << (I == D->varlist_begin() ? '(' : ',');
1515       NamedDecl *ND = cast<NamedDecl>(cast<DeclRefExpr>(*I)->getDecl());
1516       ND->printQualifiedName(Out);
1517     }
1518     Out << ")";
1519   }
1520 }
1521 
1522 void DeclPrinter::VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D) {
1523   if (!D->isInvalidDecl()) {
1524     Out << "#pragma omp declare reduction (";
1525     if (D->getDeclName().getNameKind() == DeclarationName::CXXOperatorName) {
1526       static const char *const OperatorNames[NUM_OVERLOADED_OPERATORS] = {
1527           nullptr,
1528 #define OVERLOADED_OPERATOR(Name, Spelling, Token, Unary, Binary, MemberOnly)  \
1529           Spelling,
1530 #include "clang/Basic/OperatorKinds.def"
1531       };
1532       const char *OpName =
1533           OperatorNames[D->getDeclName().getCXXOverloadedOperator()];
1534       assert(OpName && "not an overloaded operator");
1535       Out << OpName;
1536     } else {
1537       assert(D->getDeclName().isIdentifier());
1538       D->printName(Out);
1539     }
1540     Out << " : ";
1541     D->getType().print(Out, Policy);
1542     Out << " : ";
1543     D->getCombiner()->printPretty(Out, nullptr, Policy, 0);
1544     Out << ")";
1545     if (auto *Init = D->getInitializer()) {
1546       Out << " initializer(";
1547       switch (D->getInitializerKind()) {
1548       case OMPDeclareReductionDecl::DirectInit:
1549         Out << "omp_priv(";
1550         break;
1551       case OMPDeclareReductionDecl::CopyInit:
1552         Out << "omp_priv = ";
1553         break;
1554       case OMPDeclareReductionDecl::CallInit:
1555         break;
1556       }
1557       Init->printPretty(Out, nullptr, Policy, 0);
1558       if (D->getInitializerKind() == OMPDeclareReductionDecl::DirectInit)
1559         Out << ")";
1560       Out << ")";
1561     }
1562   }
1563 }
1564 
1565 void DeclPrinter::VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D) {
1566   D->getInit()->printPretty(Out, nullptr, Policy, Indentation);
1567 }
1568 
1569