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     void PrintConstructorInitializers(CXXConstructorDecl *CDecl,
41                                       std::string &Proto);
42 
43     /// Print an Objective-C method type in parentheses.
44     ///
45     /// \param Quals The Objective-C declaration qualifiers.
46     /// \param T The type to print.
47     void PrintObjCMethodType(ASTContext &Ctx, Decl::ObjCDeclQualifier Quals,
48                              QualType T);
49 
50     void PrintObjCTypeParams(ObjCTypeParamList *Params);
51 
52   public:
53     DeclPrinter(raw_ostream &Out, const PrintingPolicy &Policy,
54                 const ASTContext &Context, unsigned Indentation = 0,
55                 bool PrintInstantiation = false)
56         : Out(Out), Policy(Policy), Context(Context), Indentation(Indentation),
57           PrintInstantiation(PrintInstantiation) {}
58 
59     void VisitDeclContext(DeclContext *DC, bool Indent = true);
60 
61     void VisitTranslationUnitDecl(TranslationUnitDecl *D);
62     void VisitTypedefDecl(TypedefDecl *D);
63     void VisitTypeAliasDecl(TypeAliasDecl *D);
64     void VisitEnumDecl(EnumDecl *D);
65     void VisitRecordDecl(RecordDecl *D);
66     void VisitEnumConstantDecl(EnumConstantDecl *D);
67     void VisitEmptyDecl(EmptyDecl *D);
68     void VisitFunctionDecl(FunctionDecl *D);
69     void VisitFriendDecl(FriendDecl *D);
70     void VisitFieldDecl(FieldDecl *D);
71     void VisitVarDecl(VarDecl *D);
72     void VisitLabelDecl(LabelDecl *D);
73     void VisitParmVarDecl(ParmVarDecl *D);
74     void VisitFileScopeAsmDecl(FileScopeAsmDecl *D);
75     void VisitImportDecl(ImportDecl *D);
76     void VisitStaticAssertDecl(StaticAssertDecl *D);
77     void VisitNamespaceDecl(NamespaceDecl *D);
78     void VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
79     void VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
80     void VisitCXXRecordDecl(CXXRecordDecl *D);
81     void VisitLinkageSpecDecl(LinkageSpecDecl *D);
82     void VisitTemplateDecl(const TemplateDecl *D);
83     void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
84     void VisitClassTemplateDecl(ClassTemplateDecl *D);
85     void VisitClassTemplateSpecializationDecl(
86                                             ClassTemplateSpecializationDecl *D);
87     void VisitClassTemplatePartialSpecializationDecl(
88                                      ClassTemplatePartialSpecializationDecl *D);
89     void VisitObjCMethodDecl(ObjCMethodDecl *D);
90     void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
91     void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
92     void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
93     void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
94     void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
95     void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
96     void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
97     void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
98     void VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
99     void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
100     void VisitUsingDecl(UsingDecl *D);
101     void VisitUsingShadowDecl(UsingShadowDecl *D);
102     void VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D);
103     void VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D);
104     void VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D);
105 
106     void printTemplateParameters(const TemplateParameterList *Params);
107     void printTemplateArguments(const TemplateArgumentList &Args,
108                                 const TemplateParameterList *Params = nullptr);
109     void prettyPrintAttributes(Decl *D);
110     void prettyPrintPragmas(Decl *D);
111     void printDeclType(QualType T, StringRef DeclName, bool Pack = false);
112   };
113 }
114 
115 void Decl::print(raw_ostream &Out, unsigned Indentation,
116                  bool PrintInstantiation) const {
117   print(Out, getASTContext().getPrintingPolicy(), Indentation, PrintInstantiation);
118 }
119 
120 void Decl::print(raw_ostream &Out, const PrintingPolicy &Policy,
121                  unsigned Indentation, bool PrintInstantiation) const {
122   DeclPrinter Printer(Out, Policy, getASTContext(), Indentation,
123                       PrintInstantiation);
124   Printer.Visit(const_cast<Decl*>(this));
125 }
126 
127 static QualType GetBaseType(QualType T) {
128   // FIXME: This should be on the Type class!
129   QualType BaseType = T;
130   while (!BaseType->isSpecifierType()) {
131     if (isa<TypedefType>(BaseType))
132       break;
133     else if (const PointerType* PTy = BaseType->getAs<PointerType>())
134       BaseType = PTy->getPointeeType();
135     else if (const BlockPointerType *BPy = BaseType->getAs<BlockPointerType>())
136       BaseType = BPy->getPointeeType();
137     else if (const ArrayType* ATy = dyn_cast<ArrayType>(BaseType))
138       BaseType = ATy->getElementType();
139     else if (const FunctionType* FTy = BaseType->getAs<FunctionType>())
140       BaseType = FTy->getReturnType();
141     else if (const VectorType *VTy = BaseType->getAs<VectorType>())
142       BaseType = VTy->getElementType();
143     else if (const ReferenceType *RTy = BaseType->getAs<ReferenceType>())
144       BaseType = RTy->getPointeeType();
145     else if (const AutoType *ATy = BaseType->getAs<AutoType>())
146       BaseType = ATy->getDeducedType();
147     else
148       llvm_unreachable("Unknown declarator!");
149   }
150   return BaseType;
151 }
152 
153 static QualType getDeclType(Decl* D) {
154   if (TypedefNameDecl* TDD = dyn_cast<TypedefNameDecl>(D))
155     return TDD->getUnderlyingType();
156   if (ValueDecl* VD = dyn_cast<ValueDecl>(D))
157     return VD->getType();
158   return QualType();
159 }
160 
161 void Decl::printGroup(Decl** Begin, unsigned NumDecls,
162                       raw_ostream &Out, const PrintingPolicy &Policy,
163                       unsigned Indentation) {
164   if (NumDecls == 1) {
165     (*Begin)->print(Out, Policy, Indentation);
166     return;
167   }
168 
169   Decl** End = Begin + NumDecls;
170   TagDecl* TD = dyn_cast<TagDecl>(*Begin);
171   if (TD)
172     ++Begin;
173 
174   PrintingPolicy SubPolicy(Policy);
175 
176   bool isFirst = true;
177   for ( ; Begin != End; ++Begin) {
178     if (isFirst) {
179       if(TD)
180         SubPolicy.IncludeTagDefinition = true;
181       SubPolicy.SuppressSpecifiers = false;
182       isFirst = false;
183     } else {
184       if (!isFirst) Out << ", ";
185       SubPolicy.IncludeTagDefinition = false;
186       SubPolicy.SuppressSpecifiers = true;
187     }
188 
189     (*Begin)->print(Out, SubPolicy, Indentation);
190   }
191 }
192 
193 LLVM_DUMP_METHOD void DeclContext::dumpDeclContext() const {
194   // Get the translation unit
195   const DeclContext *DC = this;
196   while (!DC->isTranslationUnit())
197     DC = DC->getParent();
198 
199   ASTContext &Ctx = cast<TranslationUnitDecl>(DC)->getASTContext();
200   DeclPrinter Printer(llvm::errs(), Ctx.getPrintingPolicy(), Ctx, 0);
201   Printer.VisitDeclContext(const_cast<DeclContext *>(this), /*Indent=*/false);
202 }
203 
204 raw_ostream& DeclPrinter::Indent(unsigned Indentation) {
205   for (unsigned i = 0; i != Indentation; ++i)
206     Out << "  ";
207   return Out;
208 }
209 
210 void DeclPrinter::prettyPrintAttributes(Decl *D) {
211   if (Policy.PolishForDeclaration)
212     return;
213 
214   if (D->hasAttrs()) {
215     AttrVec &Attrs = D->getAttrs();
216     for (auto *A : Attrs) {
217       switch (A->getKind()) {
218 #define ATTR(X)
219 #define PRAGMA_SPELLING_ATTR(X) case attr::X:
220 #include "clang/Basic/AttrList.inc"
221         break;
222       default:
223         A->printPretty(Out, Policy);
224         break;
225       }
226     }
227   }
228 }
229 
230 void DeclPrinter::prettyPrintPragmas(Decl *D) {
231   if (Policy.PolishForDeclaration)
232     return;
233 
234   if (D->hasAttrs()) {
235     AttrVec &Attrs = D->getAttrs();
236     for (auto *A : Attrs) {
237       switch (A->getKind()) {
238 #define ATTR(X)
239 #define PRAGMA_SPELLING_ATTR(X) case attr::X:
240 #include "clang/Basic/AttrList.inc"
241         A->printPretty(Out, Policy);
242         Indent();
243         break;
244       default:
245         break;
246       }
247     }
248   }
249 }
250 
251 void DeclPrinter::printDeclType(QualType T, StringRef DeclName, bool Pack) {
252   // Normally, a PackExpansionType is written as T[3]... (for instance, as a
253   // template argument), but if it is the type of a declaration, the ellipsis
254   // is placed before the name being declared.
255   if (auto *PET = T->getAs<PackExpansionType>()) {
256     Pack = true;
257     T = PET->getPattern();
258   }
259   T.print(Out, Policy, (Pack ? "..." : "") + DeclName, Indentation);
260 }
261 
262 void DeclPrinter::ProcessDeclGroup(SmallVectorImpl<Decl*>& Decls) {
263   this->Indent();
264   Decl::printGroup(Decls.data(), Decls.size(), Out, Policy, Indentation);
265   Out << ";\n";
266   Decls.clear();
267 
268 }
269 
270 void DeclPrinter::Print(AccessSpecifier AS) {
271   switch(AS) {
272   case AS_none:      llvm_unreachable("No access specifier!");
273   case AS_public:    Out << "public"; break;
274   case AS_protected: Out << "protected"; break;
275   case AS_private:   Out << "private"; break;
276   }
277 }
278 
279 void DeclPrinter::PrintConstructorInitializers(CXXConstructorDecl *CDecl,
280                                                std::string &Proto) {
281   bool HasInitializerList = false;
282   for (const auto *BMInitializer : CDecl->inits()) {
283     if (BMInitializer->isInClassMemberInitializer())
284       continue;
285 
286     if (!HasInitializerList) {
287       Proto += " : ";
288       Out << Proto;
289       Proto.clear();
290       HasInitializerList = true;
291     } else
292       Out << ", ";
293 
294     if (BMInitializer->isAnyMemberInitializer()) {
295       FieldDecl *FD = BMInitializer->getAnyMember();
296       Out << *FD;
297     } else {
298       Out << QualType(BMInitializer->getBaseClass(), 0).getAsString(Policy);
299     }
300 
301     Out << "(";
302     if (!BMInitializer->getInit()) {
303       // Nothing to print
304     } else {
305       Expr *Init = BMInitializer->getInit();
306       if (ExprWithCleanups *Tmp = dyn_cast<ExprWithCleanups>(Init))
307         Init = Tmp->getSubExpr();
308 
309       Init = Init->IgnoreParens();
310 
311       Expr *SimpleInit = nullptr;
312       Expr **Args = nullptr;
313       unsigned NumArgs = 0;
314       if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
315         Args = ParenList->getExprs();
316         NumArgs = ParenList->getNumExprs();
317       } else if (CXXConstructExpr *Construct =
318                      dyn_cast<CXXConstructExpr>(Init)) {
319         Args = Construct->getArgs();
320         NumArgs = Construct->getNumArgs();
321       } else
322         SimpleInit = Init;
323 
324       if (SimpleInit)
325         SimpleInit->printPretty(Out, nullptr, Policy, Indentation);
326       else {
327         for (unsigned I = 0; I != NumArgs; ++I) {
328           assert(Args[I] != nullptr && "Expected non-null Expr");
329           if (isa<CXXDefaultArgExpr>(Args[I]))
330             break;
331 
332           if (I)
333             Out << ", ";
334           Args[I]->printPretty(Out, nullptr, Policy, Indentation);
335         }
336       }
337     }
338     Out << ")";
339     if (BMInitializer->isPackExpansion())
340       Out << "...";
341   }
342 }
343 
344 //----------------------------------------------------------------------------
345 // Common C declarations
346 //----------------------------------------------------------------------------
347 
348 void DeclPrinter::VisitDeclContext(DeclContext *DC, bool Indent) {
349   if (Policy.TerseOutput)
350     return;
351 
352   if (Indent)
353     Indentation += Policy.Indentation;
354 
355   SmallVector<Decl*, 2> Decls;
356   for (DeclContext::decl_iterator D = DC->decls_begin(), DEnd = DC->decls_end();
357        D != DEnd; ++D) {
358 
359     // Don't print ObjCIvarDecls, as they are printed when visiting the
360     // containing ObjCInterfaceDecl.
361     if (isa<ObjCIvarDecl>(*D))
362       continue;
363 
364     // Skip over implicit declarations in pretty-printing mode.
365     if (D->isImplicit())
366       continue;
367 
368     // Don't print implicit specializations, as they are printed when visiting
369     // corresponding templates.
370     if (auto FD = dyn_cast<FunctionDecl>(*D))
371       if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation &&
372           !isa<ClassTemplateSpecializationDecl>(DC))
373         continue;
374 
375     // The next bits of code handles stuff like "struct {int x;} a,b"; we're
376     // forced to merge the declarations because there's no other way to
377     // refer to the struct in question.  This limited merging is safe without
378     // a bunch of other checks because it only merges declarations directly
379     // referring to the tag, not typedefs.
380     //
381     // Check whether the current declaration should be grouped with a previous
382     // unnamed struct.
383     QualType CurDeclType = getDeclType(*D);
384     if (!Decls.empty() && !CurDeclType.isNull()) {
385       QualType BaseType = GetBaseType(CurDeclType);
386       if (!BaseType.isNull() && isa<ElaboratedType>(BaseType))
387         BaseType = cast<ElaboratedType>(BaseType)->getNamedType();
388       if (!BaseType.isNull() && isa<TagType>(BaseType) &&
389           cast<TagType>(BaseType)->getDecl() == Decls[0]) {
390         Decls.push_back(*D);
391         continue;
392       }
393     }
394 
395     // If we have a merged group waiting to be handled, handle it now.
396     if (!Decls.empty())
397       ProcessDeclGroup(Decls);
398 
399     // If the current declaration is an unnamed tag type, save it
400     // so we can merge it with the subsequent declaration(s) using it.
401     if (isa<TagDecl>(*D) && !cast<TagDecl>(*D)->getIdentifier()) {
402       Decls.push_back(*D);
403       continue;
404     }
405 
406     if (isa<AccessSpecDecl>(*D)) {
407       Indentation -= Policy.Indentation;
408       this->Indent();
409       Print(D->getAccess());
410       Out << ":\n";
411       Indentation += Policy.Indentation;
412       continue;
413     }
414 
415     this->Indent();
416     Visit(*D);
417 
418     // FIXME: Need to be able to tell the DeclPrinter when
419     const char *Terminator = nullptr;
420     if (isa<OMPThreadPrivateDecl>(*D) || isa<OMPDeclareReductionDecl>(*D))
421       Terminator = nullptr;
422     else if (isa<ObjCMethodDecl>(*D) && cast<ObjCMethodDecl>(*D)->hasBody())
423       Terminator = nullptr;
424     else if (auto FD = dyn_cast<FunctionDecl>(*D)) {
425       if (FD->isThisDeclarationADefinition())
426         Terminator = nullptr;
427       else
428         Terminator = ";";
429     } else if (auto TD = dyn_cast<FunctionTemplateDecl>(*D)) {
430       if (TD->getTemplatedDecl()->isThisDeclarationADefinition())
431         Terminator = nullptr;
432       else
433         Terminator = ";";
434     } else if (isa<NamespaceDecl>(*D) || isa<LinkageSpecDecl>(*D) ||
435              isa<ObjCImplementationDecl>(*D) ||
436              isa<ObjCInterfaceDecl>(*D) ||
437              isa<ObjCProtocolDecl>(*D) ||
438              isa<ObjCCategoryImplDecl>(*D) ||
439              isa<ObjCCategoryDecl>(*D))
440       Terminator = nullptr;
441     else if (isa<EnumConstantDecl>(*D)) {
442       DeclContext::decl_iterator Next = D;
443       ++Next;
444       if (Next != DEnd)
445         Terminator = ",";
446     } else
447       Terminator = ";";
448 
449     if (Terminator)
450       Out << Terminator;
451     if (!Policy.TerseOutput &&
452         ((isa<FunctionDecl>(*D) &&
453           cast<FunctionDecl>(*D)->doesThisDeclarationHaveABody()) ||
454          (isa<FunctionTemplateDecl>(*D) &&
455           cast<FunctionTemplateDecl>(*D)->getTemplatedDecl()->doesThisDeclarationHaveABody())))
456       ; // StmtPrinter already added '\n' after CompoundStmt.
457     else
458       Out << "\n";
459 
460     // Declare target attribute is special one, natural spelling for the pragma
461     // assumes "ending" construct so print it here.
462     if (D->hasAttr<OMPDeclareTargetDeclAttr>())
463       Out << "#pragma omp end declare target\n";
464   }
465 
466   if (!Decls.empty())
467     ProcessDeclGroup(Decls);
468 
469   if (Indent)
470     Indentation -= Policy.Indentation;
471 }
472 
473 void DeclPrinter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
474   VisitDeclContext(D, false);
475 }
476 
477 void DeclPrinter::VisitTypedefDecl(TypedefDecl *D) {
478   if (!Policy.SuppressSpecifiers) {
479     Out << "typedef ";
480 
481     if (D->isModulePrivate())
482       Out << "__module_private__ ";
483   }
484   QualType Ty = D->getTypeSourceInfo()->getType();
485   Ty.print(Out, Policy, D->getName(), Indentation);
486   prettyPrintAttributes(D);
487 }
488 
489 void DeclPrinter::VisitTypeAliasDecl(TypeAliasDecl *D) {
490   Out << "using " << *D;
491   prettyPrintAttributes(D);
492   Out << " = " << D->getTypeSourceInfo()->getType().getAsString(Policy);
493 }
494 
495 void DeclPrinter::VisitEnumDecl(EnumDecl *D) {
496   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
497     Out << "__module_private__ ";
498   Out << "enum ";
499   if (D->isScoped()) {
500     if (D->isScopedUsingClassTag())
501       Out << "class ";
502     else
503       Out << "struct ";
504   }
505   Out << *D;
506 
507   if (D->isFixed() && D->getASTContext().getLangOpts().CPlusPlus11)
508     Out << " : " << D->getIntegerType().stream(Policy);
509 
510   if (D->isCompleteDefinition()) {
511     Out << " {\n";
512     VisitDeclContext(D);
513     Indent() << "}";
514   }
515   prettyPrintAttributes(D);
516 }
517 
518 void DeclPrinter::VisitRecordDecl(RecordDecl *D) {
519   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
520     Out << "__module_private__ ";
521   Out << D->getKindName();
522 
523   prettyPrintAttributes(D);
524 
525   if (D->getIdentifier())
526     Out << ' ' << *D;
527 
528   if (D->isCompleteDefinition()) {
529     Out << " {\n";
530     VisitDeclContext(D);
531     Indent() << "}";
532   }
533 }
534 
535 void DeclPrinter::VisitEnumConstantDecl(EnumConstantDecl *D) {
536   Out << *D;
537   prettyPrintAttributes(D);
538   if (Expr *Init = D->getInitExpr()) {
539     Out << " = ";
540     Init->printPretty(Out, nullptr, Policy, Indentation, &Context);
541   }
542 }
543 
544 void DeclPrinter::VisitFunctionDecl(FunctionDecl *D) {
545   if (!D->getDescribedFunctionTemplate() &&
546       !D->isFunctionTemplateSpecialization())
547     prettyPrintPragmas(D);
548 
549   if (D->isFunctionTemplateSpecialization())
550     Out << "template<> ";
551   else if (!D->getDescribedFunctionTemplate()) {
552     for (unsigned I = 0, NumTemplateParams = D->getNumTemplateParameterLists();
553          I < NumTemplateParams; ++I)
554       printTemplateParameters(D->getTemplateParameterList(I));
555   }
556 
557   CXXConstructorDecl *CDecl = dyn_cast<CXXConstructorDecl>(D);
558   CXXConversionDecl *ConversionDecl = dyn_cast<CXXConversionDecl>(D);
559   CXXDeductionGuideDecl *GuideDecl = dyn_cast<CXXDeductionGuideDecl>(D);
560   if (!Policy.SuppressSpecifiers) {
561     switch (D->getStorageClass()) {
562     case SC_None: break;
563     case SC_Extern: Out << "extern "; break;
564     case SC_Static: Out << "static "; break;
565     case SC_PrivateExtern: Out << "__private_extern__ "; break;
566     case SC_Auto: case SC_Register:
567       llvm_unreachable("invalid for functions");
568     }
569 
570     if (D->isInlineSpecified())  Out << "inline ";
571     if (D->isVirtualAsWritten()) Out << "virtual ";
572     if (D->isModulePrivate())    Out << "__module_private__ ";
573     if (D->isConstexpr() && !D->isExplicitlyDefaulted()) Out << "constexpr ";
574     if ((CDecl && CDecl->isExplicitSpecified()) ||
575         (ConversionDecl && ConversionDecl->isExplicitSpecified()) ||
576         (GuideDecl && GuideDecl->isExplicitSpecified()))
577       Out << "explicit ";
578   }
579 
580   PrintingPolicy SubPolicy(Policy);
581   SubPolicy.SuppressSpecifiers = false;
582   std::string Proto;
583 
584   if (Policy.FullyQualifiedName) {
585     Proto += D->getQualifiedNameAsString();
586   } else {
587     if (!Policy.SuppressScope) {
588       if (const NestedNameSpecifier *NS = D->getQualifier()) {
589         llvm::raw_string_ostream OS(Proto);
590         NS->print(OS, Policy);
591       }
592     }
593     Proto += D->getNameInfo().getAsString();
594   }
595 
596   if (GuideDecl)
597     Proto = GuideDecl->getDeducedTemplate()->getDeclName().getAsString();
598   if (const TemplateArgumentList *TArgs = D->getTemplateSpecializationArgs()) {
599     llvm::raw_string_ostream POut(Proto);
600     DeclPrinter TArgPrinter(POut, SubPolicy, Context, Indentation);
601     TArgPrinter.printTemplateArguments(*TArgs);
602   }
603 
604   QualType Ty = D->getType();
605   while (const ParenType *PT = dyn_cast<ParenType>(Ty)) {
606     Proto = '(' + Proto + ')';
607     Ty = PT->getInnerType();
608   }
609 
610   if (const FunctionType *AFT = Ty->getAs<FunctionType>()) {
611     const FunctionProtoType *FT = nullptr;
612     if (D->hasWrittenPrototype())
613       FT = dyn_cast<FunctionProtoType>(AFT);
614 
615     Proto += "(";
616     if (FT) {
617       llvm::raw_string_ostream POut(Proto);
618       DeclPrinter ParamPrinter(POut, SubPolicy, Context, Indentation);
619       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
620         if (i) POut << ", ";
621         ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
622       }
623 
624       if (FT->isVariadic()) {
625         if (D->getNumParams()) POut << ", ";
626         POut << "...";
627       }
628     } else if (D->doesThisDeclarationHaveABody() && !D->hasPrototype()) {
629       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
630         if (i)
631           Proto += ", ";
632         Proto += D->getParamDecl(i)->getNameAsString();
633       }
634     }
635 
636     Proto += ")";
637 
638     if (FT) {
639       if (FT->isConst())
640         Proto += " const";
641       if (FT->isVolatile())
642         Proto += " volatile";
643       if (FT->isRestrict())
644         Proto += " restrict";
645 
646       switch (FT->getRefQualifier()) {
647       case RQ_None:
648         break;
649       case RQ_LValue:
650         Proto += " &";
651         break;
652       case RQ_RValue:
653         Proto += " &&";
654         break;
655       }
656     }
657 
658     if (FT && FT->hasDynamicExceptionSpec()) {
659       Proto += " throw(";
660       if (FT->getExceptionSpecType() == EST_MSAny)
661         Proto += "...";
662       else
663         for (unsigned I = 0, N = FT->getNumExceptions(); I != N; ++I) {
664           if (I)
665             Proto += ", ";
666 
667           Proto += FT->getExceptionType(I).getAsString(SubPolicy);
668         }
669       Proto += ")";
670     } else if (FT && isNoexceptExceptionSpec(FT->getExceptionSpecType())) {
671       Proto += " noexcept";
672       if (FT->getExceptionSpecType() == EST_ComputedNoexcept) {
673         Proto += "(";
674         llvm::raw_string_ostream EOut(Proto);
675         FT->getNoexceptExpr()->printPretty(EOut, nullptr, SubPolicy,
676                                            Indentation);
677         EOut.flush();
678         Proto += EOut.str();
679         Proto += ")";
680       }
681     }
682 
683     if (CDecl) {
684       if (!Policy.TerseOutput)
685         PrintConstructorInitializers(CDecl, Proto);
686     } else if (!ConversionDecl && !isa<CXXDestructorDecl>(D)) {
687       if (FT && FT->hasTrailingReturn()) {
688         if (!GuideDecl)
689           Out << "auto ";
690         Out << Proto << " -> ";
691         Proto.clear();
692       }
693       AFT->getReturnType().print(Out, Policy, Proto);
694       Proto.clear();
695     }
696     Out << Proto;
697   } else {
698     Ty.print(Out, Policy, Proto);
699   }
700 
701   prettyPrintAttributes(D);
702 
703   if (D->isPure())
704     Out << " = 0";
705   else if (D->isDeletedAsWritten())
706     Out << " = delete";
707   else if (D->isExplicitlyDefaulted())
708     Out << " = default";
709   else if (D->doesThisDeclarationHaveABody()) {
710     if (!Policy.TerseOutput) {
711       if (!D->hasPrototype() && D->getNumParams()) {
712         // This is a K&R function definition, so we need to print the
713         // parameters.
714         Out << '\n';
715         DeclPrinter ParamPrinter(Out, SubPolicy, Context, Indentation);
716         Indentation += Policy.Indentation;
717         for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
718           Indent();
719           ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
720           Out << ";\n";
721         }
722         Indentation -= Policy.Indentation;
723       } else
724         Out << ' ';
725 
726       if (D->getBody())
727         D->getBody()->printPretty(Out, nullptr, SubPolicy, Indentation);
728     } else {
729       if (!Policy.TerseOutput && isa<CXXConstructorDecl>(*D))
730         Out << " {}";
731     }
732   }
733 }
734 
735 void DeclPrinter::VisitFriendDecl(FriendDecl *D) {
736   if (TypeSourceInfo *TSI = D->getFriendType()) {
737     unsigned NumTPLists = D->getFriendTypeNumTemplateParameterLists();
738     for (unsigned i = 0; i < NumTPLists; ++i)
739       printTemplateParameters(D->getFriendTypeTemplateParameterList(i));
740     Out << "friend ";
741     Out << " " << TSI->getType().getAsString(Policy);
742   }
743   else if (FunctionDecl *FD =
744       dyn_cast<FunctionDecl>(D->getFriendDecl())) {
745     Out << "friend ";
746     VisitFunctionDecl(FD);
747   }
748   else if (FunctionTemplateDecl *FTD =
749            dyn_cast<FunctionTemplateDecl>(D->getFriendDecl())) {
750     Out << "friend ";
751     VisitFunctionTemplateDecl(FTD);
752   }
753   else if (ClassTemplateDecl *CTD =
754            dyn_cast<ClassTemplateDecl>(D->getFriendDecl())) {
755     Out << "friend ";
756     VisitRedeclarableTemplateDecl(CTD);
757   }
758 }
759 
760 void DeclPrinter::VisitFieldDecl(FieldDecl *D) {
761   // FIXME: add printing of pragma attributes if required.
762   if (!Policy.SuppressSpecifiers && D->isMutable())
763     Out << "mutable ";
764   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
765     Out << "__module_private__ ";
766 
767   Out << D->getASTContext().getUnqualifiedObjCPointerType(D->getType()).
768          stream(Policy, D->getName(), Indentation);
769 
770   if (D->isBitField()) {
771     Out << " : ";
772     D->getBitWidth()->printPretty(Out, nullptr, Policy, Indentation);
773   }
774 
775   Expr *Init = D->getInClassInitializer();
776   if (!Policy.SuppressInitializers && Init) {
777     if (D->getInClassInitStyle() == ICIS_ListInit)
778       Out << " ";
779     else
780       Out << " = ";
781     Init->printPretty(Out, nullptr, Policy, Indentation);
782   }
783   prettyPrintAttributes(D);
784 }
785 
786 void DeclPrinter::VisitLabelDecl(LabelDecl *D) {
787   Out << *D << ":";
788 }
789 
790 void DeclPrinter::VisitVarDecl(VarDecl *D) {
791   prettyPrintPragmas(D);
792 
793   QualType T = D->getTypeSourceInfo()
794     ? D->getTypeSourceInfo()->getType()
795     : D->getASTContext().getUnqualifiedObjCPointerType(D->getType());
796 
797   if (!Policy.SuppressSpecifiers) {
798     StorageClass SC = D->getStorageClass();
799     if (SC != SC_None)
800       Out << VarDecl::getStorageClassSpecifierString(SC) << " ";
801 
802     switch (D->getTSCSpec()) {
803     case TSCS_unspecified:
804       break;
805     case TSCS___thread:
806       Out << "__thread ";
807       break;
808     case TSCS__Thread_local:
809       Out << "_Thread_local ";
810       break;
811     case TSCS_thread_local:
812       Out << "thread_local ";
813       break;
814     }
815 
816     if (D->isModulePrivate())
817       Out << "__module_private__ ";
818 
819     if (D->isConstexpr()) {
820       Out << "constexpr ";
821       T.removeLocalConst();
822     }
823   }
824 
825   printDeclType(T, D->getName());
826   Expr *Init = D->getInit();
827   if (!Policy.SuppressInitializers && Init) {
828     bool ImplicitInit = false;
829     if (CXXConstructExpr *Construct =
830             dyn_cast<CXXConstructExpr>(Init->IgnoreImplicit())) {
831       if (D->getInitStyle() == VarDecl::CallInit &&
832           !Construct->isListInitialization()) {
833         ImplicitInit = Construct->getNumArgs() == 0 ||
834           Construct->getArg(0)->isDefaultArgument();
835       }
836     }
837     if (!ImplicitInit) {
838       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
839         Out << "(";
840       else if (D->getInitStyle() == VarDecl::CInit) {
841         Out << " = ";
842       }
843       PrintingPolicy SubPolicy(Policy);
844       SubPolicy.SuppressSpecifiers = false;
845       SubPolicy.IncludeTagDefinition = false;
846       Init->printPretty(Out, nullptr, SubPolicy, Indentation);
847       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
848         Out << ")";
849     }
850   }
851   prettyPrintAttributes(D);
852 }
853 
854 void DeclPrinter::VisitParmVarDecl(ParmVarDecl *D) {
855   VisitVarDecl(D);
856 }
857 
858 void DeclPrinter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
859   Out << "__asm (";
860   D->getAsmString()->printPretty(Out, nullptr, Policy, Indentation);
861   Out << ")";
862 }
863 
864 void DeclPrinter::VisitImportDecl(ImportDecl *D) {
865   Out << "@import " << D->getImportedModule()->getFullModuleName()
866       << ";\n";
867 }
868 
869 void DeclPrinter::VisitStaticAssertDecl(StaticAssertDecl *D) {
870   Out << "static_assert(";
871   D->getAssertExpr()->printPretty(Out, nullptr, Policy, Indentation);
872   if (StringLiteral *SL = D->getMessage()) {
873     Out << ", ";
874     SL->printPretty(Out, nullptr, Policy, Indentation);
875   }
876   Out << ")";
877 }
878 
879 //----------------------------------------------------------------------------
880 // C++ declarations
881 //----------------------------------------------------------------------------
882 void DeclPrinter::VisitNamespaceDecl(NamespaceDecl *D) {
883   if (D->isInline())
884     Out << "inline ";
885   Out << "namespace " << *D << " {\n";
886   VisitDeclContext(D);
887   Indent() << "}";
888 }
889 
890 void DeclPrinter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
891   Out << "using namespace ";
892   if (D->getQualifier())
893     D->getQualifier()->print(Out, Policy);
894   Out << *D->getNominatedNamespaceAsWritten();
895 }
896 
897 void DeclPrinter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
898   Out << "namespace " << *D << " = ";
899   if (D->getQualifier())
900     D->getQualifier()->print(Out, Policy);
901   Out << *D->getAliasedNamespace();
902 }
903 
904 void DeclPrinter::VisitEmptyDecl(EmptyDecl *D) {
905   prettyPrintAttributes(D);
906 }
907 
908 void DeclPrinter::VisitCXXRecordDecl(CXXRecordDecl *D) {
909   // FIXME: add printing of pragma attributes if required.
910   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
911     Out << "__module_private__ ";
912   Out << D->getKindName();
913 
914   prettyPrintAttributes(D);
915 
916   if (D->getIdentifier()) {
917     Out << ' ' << *D;
918 
919     if (auto S = dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
920       printTemplateArguments(S->getTemplateArgs(), S->getTemplateParameters());
921     else if (auto S = dyn_cast<ClassTemplateSpecializationDecl>(D))
922       printTemplateArguments(S->getTemplateArgs());
923   }
924 
925   if (D->isCompleteDefinition()) {
926     // Print the base classes
927     if (D->getNumBases()) {
928       Out << " : ";
929       for (CXXRecordDecl::base_class_iterator Base = D->bases_begin(),
930              BaseEnd = D->bases_end(); Base != BaseEnd; ++Base) {
931         if (Base != D->bases_begin())
932           Out << ", ";
933 
934         if (Base->isVirtual())
935           Out << "virtual ";
936 
937         AccessSpecifier AS = Base->getAccessSpecifierAsWritten();
938         if (AS != AS_none) {
939           Print(AS);
940           Out << " ";
941         }
942         Out << Base->getType().getAsString(Policy);
943 
944         if (Base->isPackExpansion())
945           Out << "...";
946       }
947     }
948 
949     // Print the class definition
950     // FIXME: Doesn't print access specifiers, e.g., "public:"
951     if (Policy.TerseOutput) {
952       Out << " {}";
953     } else {
954       Out << " {\n";
955       VisitDeclContext(D);
956       Indent() << "}";
957     }
958   }
959 }
960 
961 void DeclPrinter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
962   const char *l;
963   if (D->getLanguage() == LinkageSpecDecl::lang_c)
964     l = "C";
965   else {
966     assert(D->getLanguage() == LinkageSpecDecl::lang_cxx &&
967            "unknown language in linkage specification");
968     l = "C++";
969   }
970 
971   Out << "extern \"" << l << "\" ";
972   if (D->hasBraces()) {
973     Out << "{\n";
974     VisitDeclContext(D);
975     Indent() << "}";
976   } else
977     Visit(*D->decls_begin());
978 }
979 
980 void DeclPrinter::printTemplateParameters(const TemplateParameterList *Params) {
981   assert(Params);
982 
983   Out << "template <";
984 
985   for (unsigned i = 0, e = Params->size(); i != e; ++i) {
986     if (i != 0)
987       Out << ", ";
988 
989     const Decl *Param = Params->getParam(i);
990     if (auto TTP = dyn_cast<TemplateTypeParmDecl>(Param)) {
991 
992       if (TTP->wasDeclaredWithTypename())
993         Out << "typename ";
994       else
995         Out << "class ";
996 
997       if (TTP->isParameterPack())
998         Out << "...";
999 
1000       Out << *TTP;
1001 
1002       if (TTP->hasDefaultArgument()) {
1003         Out << " = ";
1004         Out << TTP->getDefaultArgument().getAsString(Policy);
1005       };
1006     } else if (auto NTTP = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
1007       StringRef Name;
1008       if (IdentifierInfo *II = NTTP->getIdentifier())
1009         Name = II->getName();
1010       printDeclType(NTTP->getType(), Name, NTTP->isParameterPack());
1011 
1012       if (NTTP->hasDefaultArgument()) {
1013         Out << " = ";
1014         NTTP->getDefaultArgument()->printPretty(Out, nullptr, Policy,
1015                                                 Indentation);
1016       }
1017     } else if (auto TTPD = dyn_cast<TemplateTemplateParmDecl>(Param)) {
1018       VisitTemplateDecl(TTPD);
1019       // FIXME: print the default argument, if present.
1020     }
1021   }
1022 
1023   Out << "> ";
1024 }
1025 
1026 void DeclPrinter::printTemplateArguments(const TemplateArgumentList &Args,
1027                                          const TemplateParameterList *Params) {
1028   Out << "<";
1029   for (size_t I = 0, E = Args.size(); I < E; ++I) {
1030     const TemplateArgument &A = Args[I];
1031     if (I)
1032       Out << ", ";
1033     if (Params) {
1034       if (A.getKind() == TemplateArgument::Type)
1035         if (auto T = A.getAsType()->getAs<TemplateTypeParmType>()) {
1036           auto P = cast<TemplateTypeParmDecl>(Params->getParam(T->getIndex()));
1037           Out << *P;
1038           continue;
1039         }
1040       if (A.getKind() == TemplateArgument::Template) {
1041         if (auto T = A.getAsTemplate().getAsTemplateDecl())
1042           if (auto TD = dyn_cast<TemplateTemplateParmDecl>(T)) {
1043             auto P = cast<TemplateTemplateParmDecl>(
1044                                               Params->getParam(TD->getIndex()));
1045             Out << *P;
1046             continue;
1047           }
1048       }
1049       if (A.getKind() == TemplateArgument::Expression) {
1050         if (auto E = dyn_cast<DeclRefExpr>(A.getAsExpr()))
1051           if (auto N = dyn_cast<NonTypeTemplateParmDecl>(E->getDecl())) {
1052             auto P = cast<NonTypeTemplateParmDecl>(
1053                                                Params->getParam(N->getIndex()));
1054             Out << *P;
1055             continue;
1056           }
1057       }
1058     }
1059     A.print(Policy, Out);
1060   }
1061   Out << ">";
1062 }
1063 
1064 void DeclPrinter::VisitTemplateDecl(const TemplateDecl *D) {
1065   printTemplateParameters(D->getTemplateParameters());
1066 
1067   if (const TemplateTemplateParmDecl *TTP =
1068         dyn_cast<TemplateTemplateParmDecl>(D)) {
1069     Out << "class ";
1070     if (TTP->isParameterPack())
1071       Out << "...";
1072     Out << D->getName();
1073   } else {
1074     Visit(D->getTemplatedDecl());
1075   }
1076 }
1077 
1078 void DeclPrinter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1079   prettyPrintPragmas(D->getTemplatedDecl());
1080   // Print any leading template parameter lists.
1081   if (const FunctionDecl *FD = D->getTemplatedDecl()) {
1082     for (unsigned I = 0, NumTemplateParams = FD->getNumTemplateParameterLists();
1083          I < NumTemplateParams; ++I)
1084       printTemplateParameters(FD->getTemplateParameterList(I));
1085   }
1086   VisitRedeclarableTemplateDecl(D);
1087 
1088   // Never print "instantiations" for deduction guides (they don't really
1089   // have them).
1090   if (PrintInstantiation &&
1091       !isa<CXXDeductionGuideDecl>(D->getTemplatedDecl())) {
1092     FunctionDecl *PrevDecl = D->getTemplatedDecl();
1093     const FunctionDecl *Def;
1094     if (PrevDecl->isDefined(Def) && Def != PrevDecl)
1095       return;
1096     for (auto *I : D->specializations())
1097       if (I->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) {
1098         if (!PrevDecl->isThisDeclarationADefinition())
1099           Out << ";\n";
1100         Indent();
1101         prettyPrintPragmas(I);
1102         Visit(I);
1103       }
1104   }
1105 }
1106 
1107 void DeclPrinter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1108   VisitRedeclarableTemplateDecl(D);
1109 
1110   if (PrintInstantiation) {
1111     for (auto *I : D->specializations())
1112       if (I->getSpecializationKind() == TSK_ImplicitInstantiation) {
1113         if (D->isThisDeclarationADefinition())
1114           Out << ";";
1115         Out << "\n";
1116         Visit(I);
1117       }
1118   }
1119 }
1120 
1121 void DeclPrinter::VisitClassTemplateSpecializationDecl(
1122                                            ClassTemplateSpecializationDecl *D) {
1123   Out << "template<> ";
1124   VisitCXXRecordDecl(D);
1125 }
1126 
1127 void DeclPrinter::VisitClassTemplatePartialSpecializationDecl(
1128                                     ClassTemplatePartialSpecializationDecl *D) {
1129   printTemplateParameters(D->getTemplateParameters());
1130   VisitCXXRecordDecl(D);
1131 }
1132 
1133 //----------------------------------------------------------------------------
1134 // Objective-C declarations
1135 //----------------------------------------------------------------------------
1136 
1137 void DeclPrinter::PrintObjCMethodType(ASTContext &Ctx,
1138                                       Decl::ObjCDeclQualifier Quals,
1139                                       QualType T) {
1140   Out << '(';
1141   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_In)
1142     Out << "in ";
1143   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Inout)
1144     Out << "inout ";
1145   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Out)
1146     Out << "out ";
1147   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Bycopy)
1148     Out << "bycopy ";
1149   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Byref)
1150     Out << "byref ";
1151   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Oneway)
1152     Out << "oneway ";
1153   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_CSNullability) {
1154     if (auto nullability = AttributedType::stripOuterNullability(T))
1155       Out << getNullabilitySpelling(*nullability, true) << ' ';
1156   }
1157 
1158   Out << Ctx.getUnqualifiedObjCPointerType(T).getAsString(Policy);
1159   Out << ')';
1160 }
1161 
1162 void DeclPrinter::PrintObjCTypeParams(ObjCTypeParamList *Params) {
1163   Out << "<";
1164   unsigned First = true;
1165   for (auto *Param : *Params) {
1166     if (First) {
1167       First = false;
1168     } else {
1169       Out << ", ";
1170     }
1171 
1172     switch (Param->getVariance()) {
1173     case ObjCTypeParamVariance::Invariant:
1174       break;
1175 
1176     case ObjCTypeParamVariance::Covariant:
1177       Out << "__covariant ";
1178       break;
1179 
1180     case ObjCTypeParamVariance::Contravariant:
1181       Out << "__contravariant ";
1182       break;
1183     }
1184 
1185     Out << Param->getDeclName().getAsString();
1186 
1187     if (Param->hasExplicitBound()) {
1188       Out << " : " << Param->getUnderlyingType().getAsString(Policy);
1189     }
1190   }
1191   Out << ">";
1192 }
1193 
1194 void DeclPrinter::VisitObjCMethodDecl(ObjCMethodDecl *OMD) {
1195   if (OMD->isInstanceMethod())
1196     Out << "- ";
1197   else
1198     Out << "+ ";
1199   if (!OMD->getReturnType().isNull()) {
1200     PrintObjCMethodType(OMD->getASTContext(), OMD->getObjCDeclQualifier(),
1201                         OMD->getReturnType());
1202   }
1203 
1204   std::string name = OMD->getSelector().getAsString();
1205   std::string::size_type pos, lastPos = 0;
1206   for (const auto *PI : OMD->parameters()) {
1207     // FIXME: selector is missing here!
1208     pos = name.find_first_of(':', lastPos);
1209     if (lastPos != 0)
1210       Out << " ";
1211     Out << name.substr(lastPos, pos - lastPos) << ':';
1212     PrintObjCMethodType(OMD->getASTContext(),
1213                         PI->getObjCDeclQualifier(),
1214                         PI->getType());
1215     Out << *PI;
1216     lastPos = pos + 1;
1217   }
1218 
1219   if (OMD->param_begin() == OMD->param_end())
1220     Out << name;
1221 
1222   if (OMD->isVariadic())
1223       Out << ", ...";
1224 
1225   prettyPrintAttributes(OMD);
1226 
1227   if (OMD->getBody() && !Policy.TerseOutput) {
1228     Out << ' ';
1229     OMD->getBody()->printPretty(Out, nullptr, Policy);
1230   }
1231   else if (Policy.PolishForDeclaration)
1232     Out << ';';
1233 }
1234 
1235 void DeclPrinter::VisitObjCImplementationDecl(ObjCImplementationDecl *OID) {
1236   std::string I = OID->getNameAsString();
1237   ObjCInterfaceDecl *SID = OID->getSuperClass();
1238 
1239   bool eolnOut = false;
1240   if (SID)
1241     Out << "@implementation " << I << " : " << *SID;
1242   else
1243     Out << "@implementation " << I;
1244 
1245   if (OID->ivar_size() > 0) {
1246     Out << "{\n";
1247     eolnOut = true;
1248     Indentation += Policy.Indentation;
1249     for (const auto *I : OID->ivars()) {
1250       Indent() << I->getASTContext().getUnqualifiedObjCPointerType(I->getType()).
1251                     getAsString(Policy) << ' ' << *I << ";\n";
1252     }
1253     Indentation -= Policy.Indentation;
1254     Out << "}\n";
1255   }
1256   else if (SID || (OID->decls_begin() != OID->decls_end())) {
1257     Out << "\n";
1258     eolnOut = true;
1259   }
1260   VisitDeclContext(OID, false);
1261   if (!eolnOut)
1262     Out << "\n";
1263   Out << "@end";
1264 }
1265 
1266 void DeclPrinter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *OID) {
1267   std::string I = OID->getNameAsString();
1268   ObjCInterfaceDecl *SID = OID->getSuperClass();
1269 
1270   if (!OID->isThisDeclarationADefinition()) {
1271     Out << "@class " << I;
1272 
1273     if (auto TypeParams = OID->getTypeParamListAsWritten()) {
1274       PrintObjCTypeParams(TypeParams);
1275     }
1276 
1277     Out << ";";
1278     return;
1279   }
1280   bool eolnOut = false;
1281   Out << "@interface " << I;
1282 
1283   if (auto TypeParams = OID->getTypeParamListAsWritten()) {
1284     PrintObjCTypeParams(TypeParams);
1285   }
1286 
1287   if (SID)
1288     Out << " : " << QualType(OID->getSuperClassType(), 0).getAsString(Policy);
1289 
1290   // Protocols?
1291   const ObjCList<ObjCProtocolDecl> &Protocols = OID->getReferencedProtocols();
1292   if (!Protocols.empty()) {
1293     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
1294          E = Protocols.end(); I != E; ++I)
1295       Out << (I == Protocols.begin() ? '<' : ',') << **I;
1296     Out << "> ";
1297   }
1298 
1299   if (OID->ivar_size() > 0) {
1300     Out << "{\n";
1301     eolnOut = true;
1302     Indentation += Policy.Indentation;
1303     for (const auto *I : OID->ivars()) {
1304       Indent() << I->getASTContext()
1305                       .getUnqualifiedObjCPointerType(I->getType())
1306                       .getAsString(Policy) << ' ' << *I << ";\n";
1307     }
1308     Indentation -= Policy.Indentation;
1309     Out << "}\n";
1310   }
1311   else if (SID || (OID->decls_begin() != OID->decls_end())) {
1312     Out << "\n";
1313     eolnOut = true;
1314   }
1315 
1316   VisitDeclContext(OID, false);
1317   if (!eolnOut)
1318     Out << "\n";
1319   Out << "@end";
1320   // FIXME: implement the rest...
1321 }
1322 
1323 void DeclPrinter::VisitObjCProtocolDecl(ObjCProtocolDecl *PID) {
1324   if (!PID->isThisDeclarationADefinition()) {
1325     Out << "@protocol " << *PID << ";\n";
1326     return;
1327   }
1328   // Protocols?
1329   const ObjCList<ObjCProtocolDecl> &Protocols = PID->getReferencedProtocols();
1330   if (!Protocols.empty()) {
1331     Out << "@protocol " << *PID;
1332     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
1333          E = Protocols.end(); I != E; ++I)
1334       Out << (I == Protocols.begin() ? '<' : ',') << **I;
1335     Out << ">\n";
1336   } else
1337     Out << "@protocol " << *PID << '\n';
1338   VisitDeclContext(PID, false);
1339   Out << "@end";
1340 }
1341 
1342 void DeclPrinter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *PID) {
1343   Out << "@implementation " << *PID->getClassInterface() << '(' << *PID <<")\n";
1344 
1345   VisitDeclContext(PID, false);
1346   Out << "@end";
1347   // FIXME: implement the rest...
1348 }
1349 
1350 void DeclPrinter::VisitObjCCategoryDecl(ObjCCategoryDecl *PID) {
1351   Out << "@interface " << *PID->getClassInterface();
1352   if (auto TypeParams = PID->getTypeParamList()) {
1353     PrintObjCTypeParams(TypeParams);
1354   }
1355   Out << "(" << *PID << ")\n";
1356   if (PID->ivar_size() > 0) {
1357     Out << "{\n";
1358     Indentation += Policy.Indentation;
1359     for (const auto *I : PID->ivars())
1360       Indent() << I->getASTContext().getUnqualifiedObjCPointerType(I->getType()).
1361                     getAsString(Policy) << ' ' << *I << ";\n";
1362     Indentation -= Policy.Indentation;
1363     Out << "}\n";
1364   }
1365 
1366   VisitDeclContext(PID, false);
1367   Out << "@end";
1368 
1369   // FIXME: implement the rest...
1370 }
1371 
1372 void DeclPrinter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *AID) {
1373   Out << "@compatibility_alias " << *AID
1374       << ' ' << *AID->getClassInterface() << ";\n";
1375 }
1376 
1377 /// PrintObjCPropertyDecl - print a property declaration.
1378 ///
1379 void DeclPrinter::VisitObjCPropertyDecl(ObjCPropertyDecl *PDecl) {
1380   if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Required)
1381     Out << "@required\n";
1382   else if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Optional)
1383     Out << "@optional\n";
1384 
1385   QualType T = PDecl->getType();
1386 
1387   Out << "@property";
1388   if (PDecl->getPropertyAttributes() != ObjCPropertyDecl::OBJC_PR_noattr) {
1389     bool first = true;
1390     Out << " (";
1391     if (PDecl->getPropertyAttributes() &
1392         ObjCPropertyDecl::OBJC_PR_readonly) {
1393       Out << (first ? ' ' : ',') << "readonly";
1394       first = false;
1395     }
1396 
1397     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) {
1398       Out << (first ? ' ' : ',') << "getter = ";
1399       PDecl->getGetterName().print(Out);
1400       first = false;
1401     }
1402     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) {
1403       Out << (first ? ' ' : ',') << "setter = ";
1404       PDecl->getSetterName().print(Out);
1405       first = false;
1406     }
1407 
1408     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_assign) {
1409       Out << (first ? ' ' : ',') << "assign";
1410       first = false;
1411     }
1412 
1413     if (PDecl->getPropertyAttributes() &
1414         ObjCPropertyDecl::OBJC_PR_readwrite) {
1415       Out << (first ? ' ' : ',') << "readwrite";
1416       first = false;
1417     }
1418 
1419     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_retain) {
1420       Out << (first ? ' ' : ',') << "retain";
1421       first = false;
1422     }
1423 
1424     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_strong) {
1425       Out << (first ? ' ' : ',') << "strong";
1426       first = false;
1427     }
1428 
1429     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_copy) {
1430       Out << (first ? ' ' : ',') << "copy";
1431       first = false;
1432     }
1433 
1434     if (PDecl->getPropertyAttributes() &
1435         ObjCPropertyDecl::OBJC_PR_nonatomic) {
1436       Out << (first ? ' ' : ',') << "nonatomic";
1437       first = false;
1438     }
1439     if (PDecl->getPropertyAttributes() &
1440         ObjCPropertyDecl::OBJC_PR_atomic) {
1441       Out << (first ? ' ' : ',') << "atomic";
1442       first = false;
1443     }
1444 
1445     if (PDecl->getPropertyAttributes() &
1446         ObjCPropertyDecl::OBJC_PR_nullability) {
1447       if (auto nullability = AttributedType::stripOuterNullability(T)) {
1448         if (*nullability == NullabilityKind::Unspecified &&
1449             (PDecl->getPropertyAttributes() &
1450                ObjCPropertyDecl::OBJC_PR_null_resettable)) {
1451           Out << (first ? ' ' : ',') << "null_resettable";
1452         } else {
1453           Out << (first ? ' ' : ',')
1454               << getNullabilitySpelling(*nullability, true);
1455         }
1456         first = false;
1457       }
1458     }
1459 
1460     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_class) {
1461       Out << (first ? ' ' : ',') << "class";
1462       first = false;
1463     }
1464 
1465     (void) first; // Silence dead store warning due to idiomatic code.
1466     Out << " )";
1467   }
1468   Out << ' ' << PDecl->getASTContext().getUnqualifiedObjCPointerType(T).
1469                   getAsString(Policy) << ' ' << *PDecl;
1470   if (Policy.PolishForDeclaration)
1471     Out << ';';
1472 }
1473 
1474 void DeclPrinter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *PID) {
1475   if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize)
1476     Out << "@synthesize ";
1477   else
1478     Out << "@dynamic ";
1479   Out << *PID->getPropertyDecl();
1480   if (PID->getPropertyIvarDecl())
1481     Out << '=' << *PID->getPropertyIvarDecl();
1482 }
1483 
1484 void DeclPrinter::VisitUsingDecl(UsingDecl *D) {
1485   if (!D->isAccessDeclaration())
1486     Out << "using ";
1487   if (D->hasTypename())
1488     Out << "typename ";
1489   D->getQualifier()->print(Out, Policy);
1490 
1491   // Use the correct record name when the using declaration is used for
1492   // inheriting constructors.
1493   for (const auto *Shadow : D->shadows()) {
1494     if (const auto *ConstructorShadow =
1495             dyn_cast<ConstructorUsingShadowDecl>(Shadow)) {
1496       assert(Shadow->getDeclContext() == ConstructorShadow->getDeclContext());
1497       Out << *ConstructorShadow->getNominatedBaseClass();
1498       return;
1499     }
1500   }
1501   Out << *D;
1502 }
1503 
1504 void
1505 DeclPrinter::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) {
1506   Out << "using typename ";
1507   D->getQualifier()->print(Out, Policy);
1508   Out << D->getDeclName();
1509 }
1510 
1511 void DeclPrinter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1512   if (!D->isAccessDeclaration())
1513     Out << "using ";
1514   D->getQualifier()->print(Out, Policy);
1515   Out << D->getDeclName();
1516 }
1517 
1518 void DeclPrinter::VisitUsingShadowDecl(UsingShadowDecl *D) {
1519   // ignore
1520 }
1521 
1522 void DeclPrinter::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
1523   Out << "#pragma omp threadprivate";
1524   if (!D->varlist_empty()) {
1525     for (OMPThreadPrivateDecl::varlist_iterator I = D->varlist_begin(),
1526                                                 E = D->varlist_end();
1527                                                 I != E; ++I) {
1528       Out << (I == D->varlist_begin() ? '(' : ',');
1529       NamedDecl *ND = cast<NamedDecl>(cast<DeclRefExpr>(*I)->getDecl());
1530       ND->printQualifiedName(Out);
1531     }
1532     Out << ")";
1533   }
1534 }
1535 
1536 void DeclPrinter::VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D) {
1537   if (!D->isInvalidDecl()) {
1538     Out << "#pragma omp declare reduction (";
1539     if (D->getDeclName().getNameKind() == DeclarationName::CXXOperatorName) {
1540       static const char *const OperatorNames[NUM_OVERLOADED_OPERATORS] = {
1541           nullptr,
1542 #define OVERLOADED_OPERATOR(Name, Spelling, Token, Unary, Binary, MemberOnly)  \
1543           Spelling,
1544 #include "clang/Basic/OperatorKinds.def"
1545       };
1546       const char *OpName =
1547           OperatorNames[D->getDeclName().getCXXOverloadedOperator()];
1548       assert(OpName && "not an overloaded operator");
1549       Out << OpName;
1550     } else {
1551       assert(D->getDeclName().isIdentifier());
1552       D->printName(Out);
1553     }
1554     Out << " : ";
1555     D->getType().print(Out, Policy);
1556     Out << " : ";
1557     D->getCombiner()->printPretty(Out, nullptr, Policy, 0);
1558     Out << ")";
1559     if (auto *Init = D->getInitializer()) {
1560       Out << " initializer(";
1561       switch (D->getInitializerKind()) {
1562       case OMPDeclareReductionDecl::DirectInit:
1563         Out << "omp_priv(";
1564         break;
1565       case OMPDeclareReductionDecl::CopyInit:
1566         Out << "omp_priv = ";
1567         break;
1568       case OMPDeclareReductionDecl::CallInit:
1569         break;
1570       }
1571       Init->printPretty(Out, nullptr, Policy, 0);
1572       if (D->getInitializerKind() == OMPDeclareReductionDecl::DirectInit)
1573         Out << ")";
1574       Out << ")";
1575     }
1576   }
1577 }
1578 
1579 void DeclPrinter::VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D) {
1580   D->getInit()->printPretty(Out, nullptr, Policy, Indentation);
1581 }
1582 
1583