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 (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 if (const ParenType *PTy = BaseType->getAs<ParenType>())
146       BaseType = PTy->desugar();
147     else
148       // This must be a syntax error.
149       break;
150   }
151   return BaseType;
152 }
153 
154 static QualType getDeclType(Decl* D) {
155   if (TypedefNameDecl* TDD = dyn_cast<TypedefNameDecl>(D))
156     return TDD->getUnderlyingType();
157   if (ValueDecl* VD = dyn_cast<ValueDecl>(D))
158     return VD->getType();
159   return QualType();
160 }
161 
162 void Decl::printGroup(Decl** Begin, unsigned NumDecls,
163                       raw_ostream &Out, const PrintingPolicy &Policy,
164                       unsigned Indentation) {
165   if (NumDecls == 1) {
166     (*Begin)->print(Out, Policy, Indentation);
167     return;
168   }
169 
170   Decl** End = Begin + NumDecls;
171   TagDecl* TD = dyn_cast<TagDecl>(*Begin);
172   if (TD)
173     ++Begin;
174 
175   PrintingPolicy SubPolicy(Policy);
176 
177   bool isFirst = true;
178   for ( ; Begin != End; ++Begin) {
179     if (isFirst) {
180       if(TD)
181         SubPolicy.IncludeTagDefinition = true;
182       SubPolicy.SuppressSpecifiers = false;
183       isFirst = false;
184     } else {
185       if (!isFirst) Out << ", ";
186       SubPolicy.IncludeTagDefinition = false;
187       SubPolicy.SuppressSpecifiers = true;
188     }
189 
190     (*Begin)->print(Out, SubPolicy, Indentation);
191   }
192 }
193 
194 LLVM_DUMP_METHOD void DeclContext::dumpDeclContext() const {
195   // Get the translation unit
196   const DeclContext *DC = this;
197   while (!DC->isTranslationUnit())
198     DC = DC->getParent();
199 
200   ASTContext &Ctx = cast<TranslationUnitDecl>(DC)->getASTContext();
201   DeclPrinter Printer(llvm::errs(), Ctx.getPrintingPolicy(), Ctx, 0);
202   Printer.VisitDeclContext(const_cast<DeclContext *>(this), /*Indent=*/false);
203 }
204 
205 raw_ostream& DeclPrinter::Indent(unsigned Indentation) {
206   for (unsigned i = 0; i != Indentation; ++i)
207     Out << "  ";
208   return Out;
209 }
210 
211 void DeclPrinter::prettyPrintAttributes(Decl *D) {
212   if (Policy.PolishForDeclaration)
213     return;
214 
215   if (D->hasAttrs()) {
216     AttrVec &Attrs = D->getAttrs();
217     for (auto *A : Attrs) {
218       if (A->isInherited() || A->isImplicit())
219         continue;
220       switch (A->getKind()) {
221 #define ATTR(X)
222 #define PRAGMA_SPELLING_ATTR(X) case attr::X:
223 #include "clang/Basic/AttrList.inc"
224         break;
225       default:
226         A->printPretty(Out, Policy);
227         break;
228       }
229     }
230   }
231 }
232 
233 void DeclPrinter::prettyPrintPragmas(Decl *D) {
234   if (Policy.PolishForDeclaration)
235     return;
236 
237   if (D->hasAttrs()) {
238     AttrVec &Attrs = D->getAttrs();
239     for (auto *A : Attrs) {
240       switch (A->getKind()) {
241 #define ATTR(X)
242 #define PRAGMA_SPELLING_ATTR(X) case attr::X:
243 #include "clang/Basic/AttrList.inc"
244         A->printPretty(Out, Policy);
245         Indent();
246         break;
247       default:
248         break;
249       }
250     }
251   }
252 }
253 
254 void DeclPrinter::printDeclType(QualType T, StringRef DeclName, bool Pack) {
255   // Normally, a PackExpansionType is written as T[3]... (for instance, as a
256   // template argument), but if it is the type of a declaration, the ellipsis
257   // is placed before the name being declared.
258   if (auto *PET = T->getAs<PackExpansionType>()) {
259     Pack = true;
260     T = PET->getPattern();
261   }
262   T.print(Out, Policy, (Pack ? "..." : "") + DeclName, Indentation);
263 }
264 
265 void DeclPrinter::ProcessDeclGroup(SmallVectorImpl<Decl*>& Decls) {
266   this->Indent();
267   Decl::printGroup(Decls.data(), Decls.size(), Out, Policy, Indentation);
268   Out << ";\n";
269   Decls.clear();
270 
271 }
272 
273 void DeclPrinter::Print(AccessSpecifier AS) {
274   switch(AS) {
275   case AS_none:      llvm_unreachable("No access specifier!");
276   case AS_public:    Out << "public"; break;
277   case AS_protected: Out << "protected"; break;
278   case AS_private:   Out << "private"; break;
279   }
280 }
281 
282 void DeclPrinter::PrintConstructorInitializers(CXXConstructorDecl *CDecl,
283                                                std::string &Proto) {
284   bool HasInitializerList = false;
285   for (const auto *BMInitializer : CDecl->inits()) {
286     if (BMInitializer->isInClassMemberInitializer())
287       continue;
288 
289     if (!HasInitializerList) {
290       Proto += " : ";
291       Out << Proto;
292       Proto.clear();
293       HasInitializerList = true;
294     } else
295       Out << ", ";
296 
297     if (BMInitializer->isAnyMemberInitializer()) {
298       FieldDecl *FD = BMInitializer->getAnyMember();
299       Out << *FD;
300     } else {
301       Out << QualType(BMInitializer->getBaseClass(), 0).getAsString(Policy);
302     }
303 
304     Out << "(";
305     if (!BMInitializer->getInit()) {
306       // Nothing to print
307     } else {
308       Expr *Init = BMInitializer->getInit();
309       if (ExprWithCleanups *Tmp = dyn_cast<ExprWithCleanups>(Init))
310         Init = Tmp->getSubExpr();
311 
312       Init = Init->IgnoreParens();
313 
314       Expr *SimpleInit = nullptr;
315       Expr **Args = nullptr;
316       unsigned NumArgs = 0;
317       if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
318         Args = ParenList->getExprs();
319         NumArgs = ParenList->getNumExprs();
320       } else if (CXXConstructExpr *Construct =
321                      dyn_cast<CXXConstructExpr>(Init)) {
322         Args = Construct->getArgs();
323         NumArgs = Construct->getNumArgs();
324       } else
325         SimpleInit = Init;
326 
327       if (SimpleInit)
328         SimpleInit->printPretty(Out, nullptr, Policy, Indentation);
329       else {
330         for (unsigned I = 0; I != NumArgs; ++I) {
331           assert(Args[I] != nullptr && "Expected non-null Expr");
332           if (isa<CXXDefaultArgExpr>(Args[I]))
333             break;
334 
335           if (I)
336             Out << ", ";
337           Args[I]->printPretty(Out, nullptr, Policy, Indentation);
338         }
339       }
340     }
341     Out << ")";
342     if (BMInitializer->isPackExpansion())
343       Out << "...";
344   }
345 }
346 
347 //----------------------------------------------------------------------------
348 // Common C declarations
349 //----------------------------------------------------------------------------
350 
351 void DeclPrinter::VisitDeclContext(DeclContext *DC, bool Indent) {
352   if (Policy.TerseOutput)
353     return;
354 
355   if (Indent)
356     Indentation += Policy.Indentation;
357 
358   SmallVector<Decl*, 2> Decls;
359   for (DeclContext::decl_iterator D = DC->decls_begin(), DEnd = DC->decls_end();
360        D != DEnd; ++D) {
361 
362     // Don't print ObjCIvarDecls, as they are printed when visiting the
363     // containing ObjCInterfaceDecl.
364     if (isa<ObjCIvarDecl>(*D))
365       continue;
366 
367     // Skip over implicit declarations in pretty-printing mode.
368     if (D->isImplicit())
369       continue;
370 
371     // Don't print implicit specializations, as they are printed when visiting
372     // corresponding templates.
373     if (auto FD = dyn_cast<FunctionDecl>(*D))
374       if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation &&
375           !isa<ClassTemplateSpecializationDecl>(DC))
376         continue;
377 
378     // The next bits of code handle stuff like "struct {int x;} a,b"; we're
379     // forced to merge the declarations because there's no other way to
380     // refer to the struct in question.  When that struct is named instead, we
381     // also need to merge to avoid splitting off a stand-alone struct
382     // declaration that produces the warning ext_no_declarators in some
383     // contexts.
384     //
385     // This limited merging is safe without a bunch of other checks because it
386     // only merges declarations directly referring to the tag, not typedefs.
387     //
388     // Check whether the current declaration should be grouped with a previous
389     // non-free-standing tag declaration.
390     QualType CurDeclType = getDeclType(*D);
391     if (!Decls.empty() && !CurDeclType.isNull()) {
392       QualType BaseType = GetBaseType(CurDeclType);
393       if (!BaseType.isNull() && isa<ElaboratedType>(BaseType) &&
394           cast<ElaboratedType>(BaseType)->getOwnedTagDecl() == Decls[0]) {
395         Decls.push_back(*D);
396         continue;
397       }
398     }
399 
400     // If we have a merged group waiting to be handled, handle it now.
401     if (!Decls.empty())
402       ProcessDeclGroup(Decls);
403 
404     // If the current declaration is not a free standing declaration, save it
405     // so we can merge it with the subsequent declaration(s) using it.
406     if (isa<TagDecl>(*D) && !cast<TagDecl>(*D)->isFreeStanding()) {
407       Decls.push_back(*D);
408       continue;
409     }
410 
411     if (isa<AccessSpecDecl>(*D)) {
412       Indentation -= Policy.Indentation;
413       this->Indent();
414       Print(D->getAccess());
415       Out << ":\n";
416       Indentation += Policy.Indentation;
417       continue;
418     }
419 
420     this->Indent();
421     Visit(*D);
422 
423     // FIXME: Need to be able to tell the DeclPrinter when
424     const char *Terminator = nullptr;
425     if (isa<OMPThreadPrivateDecl>(*D) || isa<OMPDeclareReductionDecl>(*D))
426       Terminator = nullptr;
427     else if (isa<ObjCMethodDecl>(*D) && cast<ObjCMethodDecl>(*D)->hasBody())
428       Terminator = nullptr;
429     else if (auto FD = dyn_cast<FunctionDecl>(*D)) {
430       if (FD->isThisDeclarationADefinition())
431         Terminator = nullptr;
432       else
433         Terminator = ";";
434     } else if (auto TD = dyn_cast<FunctionTemplateDecl>(*D)) {
435       if (TD->getTemplatedDecl()->isThisDeclarationADefinition())
436         Terminator = nullptr;
437       else
438         Terminator = ";";
439     } else if (isa<NamespaceDecl>(*D) || isa<LinkageSpecDecl>(*D) ||
440              isa<ObjCImplementationDecl>(*D) ||
441              isa<ObjCInterfaceDecl>(*D) ||
442              isa<ObjCProtocolDecl>(*D) ||
443              isa<ObjCCategoryImplDecl>(*D) ||
444              isa<ObjCCategoryDecl>(*D))
445       Terminator = nullptr;
446     else if (isa<EnumConstantDecl>(*D)) {
447       DeclContext::decl_iterator Next = D;
448       ++Next;
449       if (Next != DEnd)
450         Terminator = ",";
451     } else
452       Terminator = ";";
453 
454     if (Terminator)
455       Out << Terminator;
456     if (!Policy.TerseOutput &&
457         ((isa<FunctionDecl>(*D) &&
458           cast<FunctionDecl>(*D)->doesThisDeclarationHaveABody()) ||
459          (isa<FunctionTemplateDecl>(*D) &&
460           cast<FunctionTemplateDecl>(*D)->getTemplatedDecl()->doesThisDeclarationHaveABody())))
461       ; // StmtPrinter already added '\n' after CompoundStmt.
462     else
463       Out << "\n";
464 
465     // Declare target attribute is special one, natural spelling for the pragma
466     // assumes "ending" construct so print it here.
467     if (D->hasAttr<OMPDeclareTargetDeclAttr>())
468       Out << "#pragma omp end declare target\n";
469   }
470 
471   if (!Decls.empty())
472     ProcessDeclGroup(Decls);
473 
474   if (Indent)
475     Indentation -= Policy.Indentation;
476 }
477 
478 void DeclPrinter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
479   VisitDeclContext(D, false);
480 }
481 
482 void DeclPrinter::VisitTypedefDecl(TypedefDecl *D) {
483   if (!Policy.SuppressSpecifiers) {
484     Out << "typedef ";
485 
486     if (D->isModulePrivate())
487       Out << "__module_private__ ";
488   }
489   QualType Ty = D->getTypeSourceInfo()->getType();
490   Ty.print(Out, Policy, D->getName(), Indentation);
491   prettyPrintAttributes(D);
492 }
493 
494 void DeclPrinter::VisitTypeAliasDecl(TypeAliasDecl *D) {
495   Out << "using " << *D;
496   prettyPrintAttributes(D);
497   Out << " = " << D->getTypeSourceInfo()->getType().getAsString(Policy);
498 }
499 
500 void DeclPrinter::VisitEnumDecl(EnumDecl *D) {
501   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
502     Out << "__module_private__ ";
503   Out << "enum";
504   if (D->isScoped()) {
505     if (D->isScopedUsingClassTag())
506       Out << " class";
507     else
508       Out << " struct";
509   }
510 
511   prettyPrintAttributes(D);
512 
513   Out << ' ' << *D;
514 
515   if (D->isFixed() && D->getASTContext().getLangOpts().CPlusPlus11)
516     Out << " : " << D->getIntegerType().stream(Policy);
517 
518   if (D->isCompleteDefinition()) {
519     Out << " {\n";
520     VisitDeclContext(D);
521     Indent() << "}";
522   }
523 }
524 
525 void DeclPrinter::VisitRecordDecl(RecordDecl *D) {
526   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
527     Out << "__module_private__ ";
528   Out << D->getKindName();
529 
530   prettyPrintAttributes(D);
531 
532   if (D->getIdentifier())
533     Out << ' ' << *D;
534 
535   if (D->isCompleteDefinition()) {
536     Out << " {\n";
537     VisitDeclContext(D);
538     Indent() << "}";
539   }
540 }
541 
542 void DeclPrinter::VisitEnumConstantDecl(EnumConstantDecl *D) {
543   Out << *D;
544   prettyPrintAttributes(D);
545   if (Expr *Init = D->getInitExpr()) {
546     Out << " = ";
547     Init->printPretty(Out, nullptr, Policy, Indentation, &Context);
548   }
549 }
550 
551 void DeclPrinter::VisitFunctionDecl(FunctionDecl *D) {
552   if (!D->getDescribedFunctionTemplate() &&
553       !D->isFunctionTemplateSpecialization())
554     prettyPrintPragmas(D);
555 
556   if (D->isFunctionTemplateSpecialization())
557     Out << "template<> ";
558   else if (!D->getDescribedFunctionTemplate()) {
559     for (unsigned I = 0, NumTemplateParams = D->getNumTemplateParameterLists();
560          I < NumTemplateParams; ++I)
561       printTemplateParameters(D->getTemplateParameterList(I));
562   }
563 
564   CXXConstructorDecl *CDecl = dyn_cast<CXXConstructorDecl>(D);
565   CXXConversionDecl *ConversionDecl = dyn_cast<CXXConversionDecl>(D);
566   CXXDeductionGuideDecl *GuideDecl = dyn_cast<CXXDeductionGuideDecl>(D);
567   if (!Policy.SuppressSpecifiers) {
568     switch (D->getStorageClass()) {
569     case SC_None: break;
570     case SC_Extern: Out << "extern "; break;
571     case SC_Static: Out << "static "; break;
572     case SC_PrivateExtern: Out << "__private_extern__ "; break;
573     case SC_Auto: case SC_Register:
574       llvm_unreachable("invalid for functions");
575     }
576 
577     if (D->isInlineSpecified())  Out << "inline ";
578     if (D->isVirtualAsWritten()) Out << "virtual ";
579     if (D->isModulePrivate())    Out << "__module_private__ ";
580     if (D->isConstexpr() && !D->isExplicitlyDefaulted()) Out << "constexpr ";
581     if ((CDecl && CDecl->isExplicitSpecified()) ||
582         (ConversionDecl && ConversionDecl->isExplicitSpecified()) ||
583         (GuideDecl && GuideDecl->isExplicitSpecified()))
584       Out << "explicit ";
585   }
586 
587   PrintingPolicy SubPolicy(Policy);
588   SubPolicy.SuppressSpecifiers = false;
589   std::string Proto;
590 
591   if (Policy.FullyQualifiedName) {
592     Proto += D->getQualifiedNameAsString();
593   } else {
594     if (!Policy.SuppressScope) {
595       if (const NestedNameSpecifier *NS = D->getQualifier()) {
596         llvm::raw_string_ostream OS(Proto);
597         NS->print(OS, Policy);
598       }
599     }
600     Proto += D->getNameInfo().getAsString();
601   }
602 
603   if (GuideDecl)
604     Proto = GuideDecl->getDeducedTemplate()->getDeclName().getAsString();
605   if (const TemplateArgumentList *TArgs = D->getTemplateSpecializationArgs()) {
606     llvm::raw_string_ostream POut(Proto);
607     DeclPrinter TArgPrinter(POut, SubPolicy, Context, Indentation);
608     TArgPrinter.printTemplateArguments(*TArgs);
609   }
610 
611   QualType Ty = D->getType();
612   while (const ParenType *PT = dyn_cast<ParenType>(Ty)) {
613     Proto = '(' + Proto + ')';
614     Ty = PT->getInnerType();
615   }
616 
617   if (const FunctionType *AFT = Ty->getAs<FunctionType>()) {
618     const FunctionProtoType *FT = nullptr;
619     if (D->hasWrittenPrototype())
620       FT = dyn_cast<FunctionProtoType>(AFT);
621 
622     Proto += "(";
623     if (FT) {
624       llvm::raw_string_ostream POut(Proto);
625       DeclPrinter ParamPrinter(POut, SubPolicy, Context, Indentation);
626       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
627         if (i) POut << ", ";
628         ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
629       }
630 
631       if (FT->isVariadic()) {
632         if (D->getNumParams()) POut << ", ";
633         POut << "...";
634       }
635     } else if (D->doesThisDeclarationHaveABody() && !D->hasPrototype()) {
636       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
637         if (i)
638           Proto += ", ";
639         Proto += D->getParamDecl(i)->getNameAsString();
640       }
641     }
642 
643     Proto += ")";
644 
645     if (FT) {
646       if (FT->isConst())
647         Proto += " const";
648       if (FT->isVolatile())
649         Proto += " volatile";
650       if (FT->isRestrict())
651         Proto += " restrict";
652 
653       switch (FT->getRefQualifier()) {
654       case RQ_None:
655         break;
656       case RQ_LValue:
657         Proto += " &";
658         break;
659       case RQ_RValue:
660         Proto += " &&";
661         break;
662       }
663     }
664 
665     if (FT && FT->hasDynamicExceptionSpec()) {
666       Proto += " throw(";
667       if (FT->getExceptionSpecType() == EST_MSAny)
668         Proto += "...";
669       else
670         for (unsigned I = 0, N = FT->getNumExceptions(); I != N; ++I) {
671           if (I)
672             Proto += ", ";
673 
674           Proto += FT->getExceptionType(I).getAsString(SubPolicy);
675         }
676       Proto += ")";
677     } else if (FT && isNoexceptExceptionSpec(FT->getExceptionSpecType())) {
678       Proto += " noexcept";
679       if (isComputedNoexcept(FT->getExceptionSpecType())) {
680         Proto += "(";
681         llvm::raw_string_ostream EOut(Proto);
682         FT->getNoexceptExpr()->printPretty(EOut, nullptr, SubPolicy,
683                                            Indentation);
684         EOut.flush();
685         Proto += EOut.str();
686         Proto += ")";
687       }
688     }
689 
690     if (CDecl) {
691       if (!Policy.TerseOutput)
692         PrintConstructorInitializers(CDecl, Proto);
693     } else if (!ConversionDecl && !isa<CXXDestructorDecl>(D)) {
694       if (FT && FT->hasTrailingReturn()) {
695         if (!GuideDecl)
696           Out << "auto ";
697         Out << Proto << " -> ";
698         Proto.clear();
699       }
700       AFT->getReturnType().print(Out, Policy, Proto);
701       Proto.clear();
702     }
703     Out << Proto;
704   } else {
705     Ty.print(Out, Policy, Proto);
706   }
707 
708   prettyPrintAttributes(D);
709 
710   if (D->isPure())
711     Out << " = 0";
712   else if (D->isDeletedAsWritten())
713     Out << " = delete";
714   else if (D->isExplicitlyDefaulted())
715     Out << " = default";
716   else if (D->doesThisDeclarationHaveABody()) {
717     if (!Policy.TerseOutput) {
718       if (!D->hasPrototype() && D->getNumParams()) {
719         // This is a K&R function definition, so we need to print the
720         // parameters.
721         Out << '\n';
722         DeclPrinter ParamPrinter(Out, SubPolicy, Context, Indentation);
723         Indentation += Policy.Indentation;
724         for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
725           Indent();
726           ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
727           Out << ";\n";
728         }
729         Indentation -= Policy.Indentation;
730       } else
731         Out << ' ';
732 
733       if (D->getBody())
734         D->getBody()->printPretty(Out, nullptr, SubPolicy, Indentation);
735     } else {
736       if (!Policy.TerseOutput && isa<CXXConstructorDecl>(*D))
737         Out << " {}";
738     }
739   }
740 }
741 
742 void DeclPrinter::VisitFriendDecl(FriendDecl *D) {
743   if (TypeSourceInfo *TSI = D->getFriendType()) {
744     unsigned NumTPLists = D->getFriendTypeNumTemplateParameterLists();
745     for (unsigned i = 0; i < NumTPLists; ++i)
746       printTemplateParameters(D->getFriendTypeTemplateParameterList(i));
747     Out << "friend ";
748     Out << " " << TSI->getType().getAsString(Policy);
749   }
750   else if (FunctionDecl *FD =
751       dyn_cast<FunctionDecl>(D->getFriendDecl())) {
752     Out << "friend ";
753     VisitFunctionDecl(FD);
754   }
755   else if (FunctionTemplateDecl *FTD =
756            dyn_cast<FunctionTemplateDecl>(D->getFriendDecl())) {
757     Out << "friend ";
758     VisitFunctionTemplateDecl(FTD);
759   }
760   else if (ClassTemplateDecl *CTD =
761            dyn_cast<ClassTemplateDecl>(D->getFriendDecl())) {
762     Out << "friend ";
763     VisitRedeclarableTemplateDecl(CTD);
764   }
765 }
766 
767 void DeclPrinter::VisitFieldDecl(FieldDecl *D) {
768   // FIXME: add printing of pragma attributes if required.
769   if (!Policy.SuppressSpecifiers && D->isMutable())
770     Out << "mutable ";
771   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
772     Out << "__module_private__ ";
773 
774   Out << D->getASTContext().getUnqualifiedObjCPointerType(D->getType()).
775          stream(Policy, D->getName(), Indentation);
776 
777   if (D->isBitField()) {
778     Out << " : ";
779     D->getBitWidth()->printPretty(Out, nullptr, Policy, Indentation);
780   }
781 
782   Expr *Init = D->getInClassInitializer();
783   if (!Policy.SuppressInitializers && Init) {
784     if (D->getInClassInitStyle() == ICIS_ListInit)
785       Out << " ";
786     else
787       Out << " = ";
788     Init->printPretty(Out, nullptr, Policy, Indentation);
789   }
790   prettyPrintAttributes(D);
791 }
792 
793 void DeclPrinter::VisitLabelDecl(LabelDecl *D) {
794   Out << *D << ":";
795 }
796 
797 void DeclPrinter::VisitVarDecl(VarDecl *D) {
798   prettyPrintPragmas(D);
799 
800   QualType T = D->getTypeSourceInfo()
801     ? D->getTypeSourceInfo()->getType()
802     : D->getASTContext().getUnqualifiedObjCPointerType(D->getType());
803 
804   if (!Policy.SuppressSpecifiers) {
805     StorageClass SC = D->getStorageClass();
806     if (SC != SC_None)
807       Out << VarDecl::getStorageClassSpecifierString(SC) << " ";
808 
809     switch (D->getTSCSpec()) {
810     case TSCS_unspecified:
811       break;
812     case TSCS___thread:
813       Out << "__thread ";
814       break;
815     case TSCS__Thread_local:
816       Out << "_Thread_local ";
817       break;
818     case TSCS_thread_local:
819       Out << "thread_local ";
820       break;
821     }
822 
823     if (D->isModulePrivate())
824       Out << "__module_private__ ";
825 
826     if (D->isConstexpr()) {
827       Out << "constexpr ";
828       T.removeLocalConst();
829     }
830   }
831 
832   printDeclType(T, D->getName());
833   Expr *Init = D->getInit();
834   if (!Policy.SuppressInitializers && Init) {
835     bool ImplicitInit = false;
836     if (CXXConstructExpr *Construct =
837             dyn_cast<CXXConstructExpr>(Init->IgnoreImplicit())) {
838       if (D->getInitStyle() == VarDecl::CallInit &&
839           !Construct->isListInitialization()) {
840         ImplicitInit = Construct->getNumArgs() == 0 ||
841           Construct->getArg(0)->isDefaultArgument();
842       }
843     }
844     if (!ImplicitInit) {
845       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
846         Out << "(";
847       else if (D->getInitStyle() == VarDecl::CInit) {
848         Out << " = ";
849       }
850       PrintingPolicy SubPolicy(Policy);
851       SubPolicy.SuppressSpecifiers = false;
852       SubPolicy.IncludeTagDefinition = false;
853       Init->printPretty(Out, nullptr, SubPolicy, Indentation);
854       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
855         Out << ")";
856     }
857   }
858   prettyPrintAttributes(D);
859 }
860 
861 void DeclPrinter::VisitParmVarDecl(ParmVarDecl *D) {
862   VisitVarDecl(D);
863 }
864 
865 void DeclPrinter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
866   Out << "__asm (";
867   D->getAsmString()->printPretty(Out, nullptr, Policy, Indentation);
868   Out << ")";
869 }
870 
871 void DeclPrinter::VisitImportDecl(ImportDecl *D) {
872   Out << "@import " << D->getImportedModule()->getFullModuleName()
873       << ";\n";
874 }
875 
876 void DeclPrinter::VisitStaticAssertDecl(StaticAssertDecl *D) {
877   Out << "static_assert(";
878   D->getAssertExpr()->printPretty(Out, nullptr, Policy, Indentation);
879   if (StringLiteral *SL = D->getMessage()) {
880     Out << ", ";
881     SL->printPretty(Out, nullptr, Policy, Indentation);
882   }
883   Out << ")";
884 }
885 
886 //----------------------------------------------------------------------------
887 // C++ declarations
888 //----------------------------------------------------------------------------
889 void DeclPrinter::VisitNamespaceDecl(NamespaceDecl *D) {
890   if (D->isInline())
891     Out << "inline ";
892   Out << "namespace " << *D << " {\n";
893   VisitDeclContext(D);
894   Indent() << "}";
895 }
896 
897 void DeclPrinter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
898   Out << "using namespace ";
899   if (D->getQualifier())
900     D->getQualifier()->print(Out, Policy);
901   Out << *D->getNominatedNamespaceAsWritten();
902 }
903 
904 void DeclPrinter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
905   Out << "namespace " << *D << " = ";
906   if (D->getQualifier())
907     D->getQualifier()->print(Out, Policy);
908   Out << *D->getAliasedNamespace();
909 }
910 
911 void DeclPrinter::VisitEmptyDecl(EmptyDecl *D) {
912   prettyPrintAttributes(D);
913 }
914 
915 void DeclPrinter::VisitCXXRecordDecl(CXXRecordDecl *D) {
916   // FIXME: add printing of pragma attributes if required.
917   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
918     Out << "__module_private__ ";
919   Out << D->getKindName();
920 
921   prettyPrintAttributes(D);
922 
923   if (D->getIdentifier()) {
924     Out << ' ' << *D;
925 
926     if (auto S = dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
927       printTemplateArguments(S->getTemplateArgs(), S->getTemplateParameters());
928     else if (auto S = dyn_cast<ClassTemplateSpecializationDecl>(D))
929       printTemplateArguments(S->getTemplateArgs());
930   }
931 
932   if (D->isCompleteDefinition()) {
933     // Print the base classes
934     if (D->getNumBases()) {
935       Out << " : ";
936       for (CXXRecordDecl::base_class_iterator Base = D->bases_begin(),
937              BaseEnd = D->bases_end(); Base != BaseEnd; ++Base) {
938         if (Base != D->bases_begin())
939           Out << ", ";
940 
941         if (Base->isVirtual())
942           Out << "virtual ";
943 
944         AccessSpecifier AS = Base->getAccessSpecifierAsWritten();
945         if (AS != AS_none) {
946           Print(AS);
947           Out << " ";
948         }
949         Out << Base->getType().getAsString(Policy);
950 
951         if (Base->isPackExpansion())
952           Out << "...";
953       }
954     }
955 
956     // Print the class definition
957     // FIXME: Doesn't print access specifiers, e.g., "public:"
958     if (Policy.TerseOutput) {
959       Out << " {}";
960     } else {
961       Out << " {\n";
962       VisitDeclContext(D);
963       Indent() << "}";
964     }
965   }
966 }
967 
968 void DeclPrinter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
969   const char *l;
970   if (D->getLanguage() == LinkageSpecDecl::lang_c)
971     l = "C";
972   else {
973     assert(D->getLanguage() == LinkageSpecDecl::lang_cxx &&
974            "unknown language in linkage specification");
975     l = "C++";
976   }
977 
978   Out << "extern \"" << l << "\" ";
979   if (D->hasBraces()) {
980     Out << "{\n";
981     VisitDeclContext(D);
982     Indent() << "}";
983   } else
984     Visit(*D->decls_begin());
985 }
986 
987 void DeclPrinter::printTemplateParameters(const TemplateParameterList *Params) {
988   assert(Params);
989 
990   Out << "template <";
991 
992   for (unsigned i = 0, e = Params->size(); i != e; ++i) {
993     if (i != 0)
994       Out << ", ";
995 
996     const Decl *Param = Params->getParam(i);
997     if (auto TTP = dyn_cast<TemplateTypeParmDecl>(Param)) {
998 
999       if (TTP->wasDeclaredWithTypename())
1000         Out << "typename ";
1001       else
1002         Out << "class ";
1003 
1004       if (TTP->isParameterPack())
1005         Out << "...";
1006 
1007       Out << *TTP;
1008 
1009       if (TTP->hasDefaultArgument()) {
1010         Out << " = ";
1011         Out << TTP->getDefaultArgument().getAsString(Policy);
1012       };
1013     } else if (auto NTTP = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
1014       StringRef Name;
1015       if (IdentifierInfo *II = NTTP->getIdentifier())
1016         Name = II->getName();
1017       printDeclType(NTTP->getType(), Name, NTTP->isParameterPack());
1018 
1019       if (NTTP->hasDefaultArgument()) {
1020         Out << " = ";
1021         NTTP->getDefaultArgument()->printPretty(Out, nullptr, Policy,
1022                                                 Indentation);
1023       }
1024     } else if (auto TTPD = dyn_cast<TemplateTemplateParmDecl>(Param)) {
1025       VisitTemplateDecl(TTPD);
1026       // FIXME: print the default argument, if present.
1027     }
1028   }
1029 
1030   Out << "> ";
1031 }
1032 
1033 void DeclPrinter::printTemplateArguments(const TemplateArgumentList &Args,
1034                                          const TemplateParameterList *Params) {
1035   Out << "<";
1036   for (size_t I = 0, E = Args.size(); I < E; ++I) {
1037     const TemplateArgument &A = Args[I];
1038     if (I)
1039       Out << ", ";
1040     if (Params) {
1041       if (A.getKind() == TemplateArgument::Type)
1042         if (auto T = A.getAsType()->getAs<TemplateTypeParmType>()) {
1043           auto P = cast<TemplateTypeParmDecl>(Params->getParam(T->getIndex()));
1044           Out << *P;
1045           continue;
1046         }
1047       if (A.getKind() == TemplateArgument::Template) {
1048         if (auto T = A.getAsTemplate().getAsTemplateDecl())
1049           if (auto TD = dyn_cast<TemplateTemplateParmDecl>(T)) {
1050             auto P = cast<TemplateTemplateParmDecl>(
1051                                               Params->getParam(TD->getIndex()));
1052             Out << *P;
1053             continue;
1054           }
1055       }
1056       if (A.getKind() == TemplateArgument::Expression) {
1057         if (auto E = dyn_cast<DeclRefExpr>(A.getAsExpr()))
1058           if (auto N = dyn_cast<NonTypeTemplateParmDecl>(E->getDecl())) {
1059             auto P = cast<NonTypeTemplateParmDecl>(
1060                                                Params->getParam(N->getIndex()));
1061             Out << *P;
1062             continue;
1063           }
1064       }
1065     }
1066     A.print(Policy, Out);
1067   }
1068   Out << ">";
1069 }
1070 
1071 void DeclPrinter::VisitTemplateDecl(const TemplateDecl *D) {
1072   printTemplateParameters(D->getTemplateParameters());
1073 
1074   if (const TemplateTemplateParmDecl *TTP =
1075         dyn_cast<TemplateTemplateParmDecl>(D)) {
1076     Out << "class ";
1077     if (TTP->isParameterPack())
1078       Out << "...";
1079     Out << D->getName();
1080   } else {
1081     Visit(D->getTemplatedDecl());
1082   }
1083 }
1084 
1085 void DeclPrinter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1086   prettyPrintPragmas(D->getTemplatedDecl());
1087   // Print any leading template parameter lists.
1088   if (const FunctionDecl *FD = D->getTemplatedDecl()) {
1089     for (unsigned I = 0, NumTemplateParams = FD->getNumTemplateParameterLists();
1090          I < NumTemplateParams; ++I)
1091       printTemplateParameters(FD->getTemplateParameterList(I));
1092   }
1093   VisitRedeclarableTemplateDecl(D);
1094 
1095   // Never print "instantiations" for deduction guides (they don't really
1096   // have them).
1097   if (PrintInstantiation &&
1098       !isa<CXXDeductionGuideDecl>(D->getTemplatedDecl())) {
1099     FunctionDecl *PrevDecl = D->getTemplatedDecl();
1100     const FunctionDecl *Def;
1101     if (PrevDecl->isDefined(Def) && Def != PrevDecl)
1102       return;
1103     for (auto *I : D->specializations())
1104       if (I->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) {
1105         if (!PrevDecl->isThisDeclarationADefinition())
1106           Out << ";\n";
1107         Indent();
1108         prettyPrintPragmas(I);
1109         Visit(I);
1110       }
1111   }
1112 }
1113 
1114 void DeclPrinter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1115   VisitRedeclarableTemplateDecl(D);
1116 
1117   if (PrintInstantiation) {
1118     for (auto *I : D->specializations())
1119       if (I->getSpecializationKind() == TSK_ImplicitInstantiation) {
1120         if (D->isThisDeclarationADefinition())
1121           Out << ";";
1122         Out << "\n";
1123         Visit(I);
1124       }
1125   }
1126 }
1127 
1128 void DeclPrinter::VisitClassTemplateSpecializationDecl(
1129                                            ClassTemplateSpecializationDecl *D) {
1130   Out << "template<> ";
1131   VisitCXXRecordDecl(D);
1132 }
1133 
1134 void DeclPrinter::VisitClassTemplatePartialSpecializationDecl(
1135                                     ClassTemplatePartialSpecializationDecl *D) {
1136   printTemplateParameters(D->getTemplateParameters());
1137   VisitCXXRecordDecl(D);
1138 }
1139 
1140 //----------------------------------------------------------------------------
1141 // Objective-C declarations
1142 //----------------------------------------------------------------------------
1143 
1144 void DeclPrinter::PrintObjCMethodType(ASTContext &Ctx,
1145                                       Decl::ObjCDeclQualifier Quals,
1146                                       QualType T) {
1147   Out << '(';
1148   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_In)
1149     Out << "in ";
1150   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Inout)
1151     Out << "inout ";
1152   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Out)
1153     Out << "out ";
1154   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Bycopy)
1155     Out << "bycopy ";
1156   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Byref)
1157     Out << "byref ";
1158   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Oneway)
1159     Out << "oneway ";
1160   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_CSNullability) {
1161     if (auto nullability = AttributedType::stripOuterNullability(T))
1162       Out << getNullabilitySpelling(*nullability, true) << ' ';
1163   }
1164 
1165   Out << Ctx.getUnqualifiedObjCPointerType(T).getAsString(Policy);
1166   Out << ')';
1167 }
1168 
1169 void DeclPrinter::PrintObjCTypeParams(ObjCTypeParamList *Params) {
1170   Out << "<";
1171   unsigned First = true;
1172   for (auto *Param : *Params) {
1173     if (First) {
1174       First = false;
1175     } else {
1176       Out << ", ";
1177     }
1178 
1179     switch (Param->getVariance()) {
1180     case ObjCTypeParamVariance::Invariant:
1181       break;
1182 
1183     case ObjCTypeParamVariance::Covariant:
1184       Out << "__covariant ";
1185       break;
1186 
1187     case ObjCTypeParamVariance::Contravariant:
1188       Out << "__contravariant ";
1189       break;
1190     }
1191 
1192     Out << Param->getDeclName().getAsString();
1193 
1194     if (Param->hasExplicitBound()) {
1195       Out << " : " << Param->getUnderlyingType().getAsString(Policy);
1196     }
1197   }
1198   Out << ">";
1199 }
1200 
1201 void DeclPrinter::VisitObjCMethodDecl(ObjCMethodDecl *OMD) {
1202   if (OMD->isInstanceMethod())
1203     Out << "- ";
1204   else
1205     Out << "+ ";
1206   if (!OMD->getReturnType().isNull()) {
1207     PrintObjCMethodType(OMD->getASTContext(), OMD->getObjCDeclQualifier(),
1208                         OMD->getReturnType());
1209   }
1210 
1211   std::string name = OMD->getSelector().getAsString();
1212   std::string::size_type pos, lastPos = 0;
1213   for (const auto *PI : OMD->parameters()) {
1214     // FIXME: selector is missing here!
1215     pos = name.find_first_of(':', lastPos);
1216     if (lastPos != 0)
1217       Out << " ";
1218     Out << name.substr(lastPos, pos - lastPos) << ':';
1219     PrintObjCMethodType(OMD->getASTContext(),
1220                         PI->getObjCDeclQualifier(),
1221                         PI->getType());
1222     Out << *PI;
1223     lastPos = pos + 1;
1224   }
1225 
1226   if (OMD->param_begin() == OMD->param_end())
1227     Out << name;
1228 
1229   if (OMD->isVariadic())
1230       Out << ", ...";
1231 
1232   prettyPrintAttributes(OMD);
1233 
1234   if (OMD->getBody() && !Policy.TerseOutput) {
1235     Out << ' ';
1236     OMD->getBody()->printPretty(Out, nullptr, Policy);
1237   }
1238   else if (Policy.PolishForDeclaration)
1239     Out << ';';
1240 }
1241 
1242 void DeclPrinter::VisitObjCImplementationDecl(ObjCImplementationDecl *OID) {
1243   std::string I = OID->getNameAsString();
1244   ObjCInterfaceDecl *SID = OID->getSuperClass();
1245 
1246   bool eolnOut = false;
1247   if (SID)
1248     Out << "@implementation " << I << " : " << *SID;
1249   else
1250     Out << "@implementation " << I;
1251 
1252   if (OID->ivar_size() > 0) {
1253     Out << "{\n";
1254     eolnOut = true;
1255     Indentation += Policy.Indentation;
1256     for (const auto *I : OID->ivars()) {
1257       Indent() << I->getASTContext().getUnqualifiedObjCPointerType(I->getType()).
1258                     getAsString(Policy) << ' ' << *I << ";\n";
1259     }
1260     Indentation -= Policy.Indentation;
1261     Out << "}\n";
1262   }
1263   else if (SID || (OID->decls_begin() != OID->decls_end())) {
1264     Out << "\n";
1265     eolnOut = true;
1266   }
1267   VisitDeclContext(OID, false);
1268   if (!eolnOut)
1269     Out << "\n";
1270   Out << "@end";
1271 }
1272 
1273 void DeclPrinter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *OID) {
1274   std::string I = OID->getNameAsString();
1275   ObjCInterfaceDecl *SID = OID->getSuperClass();
1276 
1277   if (!OID->isThisDeclarationADefinition()) {
1278     Out << "@class " << I;
1279 
1280     if (auto TypeParams = OID->getTypeParamListAsWritten()) {
1281       PrintObjCTypeParams(TypeParams);
1282     }
1283 
1284     Out << ";";
1285     return;
1286   }
1287   bool eolnOut = false;
1288   Out << "@interface " << I;
1289 
1290   if (auto TypeParams = OID->getTypeParamListAsWritten()) {
1291     PrintObjCTypeParams(TypeParams);
1292   }
1293 
1294   if (SID)
1295     Out << " : " << QualType(OID->getSuperClassType(), 0).getAsString(Policy);
1296 
1297   // Protocols?
1298   const ObjCList<ObjCProtocolDecl> &Protocols = OID->getReferencedProtocols();
1299   if (!Protocols.empty()) {
1300     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
1301          E = Protocols.end(); I != E; ++I)
1302       Out << (I == Protocols.begin() ? '<' : ',') << **I;
1303     Out << "> ";
1304   }
1305 
1306   if (OID->ivar_size() > 0) {
1307     Out << "{\n";
1308     eolnOut = true;
1309     Indentation += Policy.Indentation;
1310     for (const auto *I : OID->ivars()) {
1311       Indent() << I->getASTContext()
1312                       .getUnqualifiedObjCPointerType(I->getType())
1313                       .getAsString(Policy) << ' ' << *I << ";\n";
1314     }
1315     Indentation -= Policy.Indentation;
1316     Out << "}\n";
1317   }
1318   else if (SID || (OID->decls_begin() != OID->decls_end())) {
1319     Out << "\n";
1320     eolnOut = true;
1321   }
1322 
1323   VisitDeclContext(OID, false);
1324   if (!eolnOut)
1325     Out << "\n";
1326   Out << "@end";
1327   // FIXME: implement the rest...
1328 }
1329 
1330 void DeclPrinter::VisitObjCProtocolDecl(ObjCProtocolDecl *PID) {
1331   if (!PID->isThisDeclarationADefinition()) {
1332     Out << "@protocol " << *PID << ";\n";
1333     return;
1334   }
1335   // Protocols?
1336   const ObjCList<ObjCProtocolDecl> &Protocols = PID->getReferencedProtocols();
1337   if (!Protocols.empty()) {
1338     Out << "@protocol " << *PID;
1339     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
1340          E = Protocols.end(); I != E; ++I)
1341       Out << (I == Protocols.begin() ? '<' : ',') << **I;
1342     Out << ">\n";
1343   } else
1344     Out << "@protocol " << *PID << '\n';
1345   VisitDeclContext(PID, false);
1346   Out << "@end";
1347 }
1348 
1349 void DeclPrinter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *PID) {
1350   Out << "@implementation " << *PID->getClassInterface() << '(' << *PID <<")\n";
1351 
1352   VisitDeclContext(PID, false);
1353   Out << "@end";
1354   // FIXME: implement the rest...
1355 }
1356 
1357 void DeclPrinter::VisitObjCCategoryDecl(ObjCCategoryDecl *PID) {
1358   Out << "@interface " << *PID->getClassInterface();
1359   if (auto TypeParams = PID->getTypeParamList()) {
1360     PrintObjCTypeParams(TypeParams);
1361   }
1362   Out << "(" << *PID << ")\n";
1363   if (PID->ivar_size() > 0) {
1364     Out << "{\n";
1365     Indentation += Policy.Indentation;
1366     for (const auto *I : PID->ivars())
1367       Indent() << I->getASTContext().getUnqualifiedObjCPointerType(I->getType()).
1368                     getAsString(Policy) << ' ' << *I << ";\n";
1369     Indentation -= Policy.Indentation;
1370     Out << "}\n";
1371   }
1372 
1373   VisitDeclContext(PID, false);
1374   Out << "@end";
1375 
1376   // FIXME: implement the rest...
1377 }
1378 
1379 void DeclPrinter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *AID) {
1380   Out << "@compatibility_alias " << *AID
1381       << ' ' << *AID->getClassInterface() << ";\n";
1382 }
1383 
1384 /// PrintObjCPropertyDecl - print a property declaration.
1385 ///
1386 void DeclPrinter::VisitObjCPropertyDecl(ObjCPropertyDecl *PDecl) {
1387   if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Required)
1388     Out << "@required\n";
1389   else if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Optional)
1390     Out << "@optional\n";
1391 
1392   QualType T = PDecl->getType();
1393 
1394   Out << "@property";
1395   if (PDecl->getPropertyAttributes() != ObjCPropertyDecl::OBJC_PR_noattr) {
1396     bool first = true;
1397     Out << " (";
1398     if (PDecl->getPropertyAttributes() &
1399         ObjCPropertyDecl::OBJC_PR_readonly) {
1400       Out << (first ? ' ' : ',') << "readonly";
1401       first = false;
1402     }
1403 
1404     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) {
1405       Out << (first ? ' ' : ',') << "getter = ";
1406       PDecl->getGetterName().print(Out);
1407       first = false;
1408     }
1409     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) {
1410       Out << (first ? ' ' : ',') << "setter = ";
1411       PDecl->getSetterName().print(Out);
1412       first = false;
1413     }
1414 
1415     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_assign) {
1416       Out << (first ? ' ' : ',') << "assign";
1417       first = false;
1418     }
1419 
1420     if (PDecl->getPropertyAttributes() &
1421         ObjCPropertyDecl::OBJC_PR_readwrite) {
1422       Out << (first ? ' ' : ',') << "readwrite";
1423       first = false;
1424     }
1425 
1426     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_retain) {
1427       Out << (first ? ' ' : ',') << "retain";
1428       first = false;
1429     }
1430 
1431     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_strong) {
1432       Out << (first ? ' ' : ',') << "strong";
1433       first = false;
1434     }
1435 
1436     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_copy) {
1437       Out << (first ? ' ' : ',') << "copy";
1438       first = false;
1439     }
1440 
1441     if (PDecl->getPropertyAttributes() &
1442         ObjCPropertyDecl::OBJC_PR_nonatomic) {
1443       Out << (first ? ' ' : ',') << "nonatomic";
1444       first = false;
1445     }
1446     if (PDecl->getPropertyAttributes() &
1447         ObjCPropertyDecl::OBJC_PR_atomic) {
1448       Out << (first ? ' ' : ',') << "atomic";
1449       first = false;
1450     }
1451 
1452     if (PDecl->getPropertyAttributes() &
1453         ObjCPropertyDecl::OBJC_PR_nullability) {
1454       if (auto nullability = AttributedType::stripOuterNullability(T)) {
1455         if (*nullability == NullabilityKind::Unspecified &&
1456             (PDecl->getPropertyAttributes() &
1457                ObjCPropertyDecl::OBJC_PR_null_resettable)) {
1458           Out << (first ? ' ' : ',') << "null_resettable";
1459         } else {
1460           Out << (first ? ' ' : ',')
1461               << getNullabilitySpelling(*nullability, true);
1462         }
1463         first = false;
1464       }
1465     }
1466 
1467     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_class) {
1468       Out << (first ? ' ' : ',') << "class";
1469       first = false;
1470     }
1471 
1472     (void) first; // Silence dead store warning due to idiomatic code.
1473     Out << " )";
1474   }
1475   Out << ' ' << PDecl->getASTContext().getUnqualifiedObjCPointerType(T).
1476                   getAsString(Policy) << ' ' << *PDecl;
1477   if (Policy.PolishForDeclaration)
1478     Out << ';';
1479 }
1480 
1481 void DeclPrinter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *PID) {
1482   if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize)
1483     Out << "@synthesize ";
1484   else
1485     Out << "@dynamic ";
1486   Out << *PID->getPropertyDecl();
1487   if (PID->getPropertyIvarDecl())
1488     Out << '=' << *PID->getPropertyIvarDecl();
1489 }
1490 
1491 void DeclPrinter::VisitUsingDecl(UsingDecl *D) {
1492   if (!D->isAccessDeclaration())
1493     Out << "using ";
1494   if (D->hasTypename())
1495     Out << "typename ";
1496   D->getQualifier()->print(Out, Policy);
1497 
1498   // Use the correct record name when the using declaration is used for
1499   // inheriting constructors.
1500   for (const auto *Shadow : D->shadows()) {
1501     if (const auto *ConstructorShadow =
1502             dyn_cast<ConstructorUsingShadowDecl>(Shadow)) {
1503       assert(Shadow->getDeclContext() == ConstructorShadow->getDeclContext());
1504       Out << *ConstructorShadow->getNominatedBaseClass();
1505       return;
1506     }
1507   }
1508   Out << *D;
1509 }
1510 
1511 void
1512 DeclPrinter::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) {
1513   Out << "using typename ";
1514   D->getQualifier()->print(Out, Policy);
1515   Out << D->getDeclName();
1516 }
1517 
1518 void DeclPrinter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1519   if (!D->isAccessDeclaration())
1520     Out << "using ";
1521   D->getQualifier()->print(Out, Policy);
1522   Out << D->getDeclName();
1523 }
1524 
1525 void DeclPrinter::VisitUsingShadowDecl(UsingShadowDecl *D) {
1526   // ignore
1527 }
1528 
1529 void DeclPrinter::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
1530   Out << "#pragma omp threadprivate";
1531   if (!D->varlist_empty()) {
1532     for (OMPThreadPrivateDecl::varlist_iterator I = D->varlist_begin(),
1533                                                 E = D->varlist_end();
1534                                                 I != E; ++I) {
1535       Out << (I == D->varlist_begin() ? '(' : ',');
1536       NamedDecl *ND = cast<DeclRefExpr>(*I)->getDecl();
1537       ND->printQualifiedName(Out);
1538     }
1539     Out << ")";
1540   }
1541 }
1542 
1543 void DeclPrinter::VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D) {
1544   if (!D->isInvalidDecl()) {
1545     Out << "#pragma omp declare reduction (";
1546     if (D->getDeclName().getNameKind() == DeclarationName::CXXOperatorName) {
1547       static const char *const OperatorNames[NUM_OVERLOADED_OPERATORS] = {
1548           nullptr,
1549 #define OVERLOADED_OPERATOR(Name, Spelling, Token, Unary, Binary, MemberOnly)  \
1550           Spelling,
1551 #include "clang/Basic/OperatorKinds.def"
1552       };
1553       const char *OpName =
1554           OperatorNames[D->getDeclName().getCXXOverloadedOperator()];
1555       assert(OpName && "not an overloaded operator");
1556       Out << OpName;
1557     } else {
1558       assert(D->getDeclName().isIdentifier());
1559       D->printName(Out);
1560     }
1561     Out << " : ";
1562     D->getType().print(Out, Policy);
1563     Out << " : ";
1564     D->getCombiner()->printPretty(Out, nullptr, Policy, 0);
1565     Out << ")";
1566     if (auto *Init = D->getInitializer()) {
1567       Out << " initializer(";
1568       switch (D->getInitializerKind()) {
1569       case OMPDeclareReductionDecl::DirectInit:
1570         Out << "omp_priv(";
1571         break;
1572       case OMPDeclareReductionDecl::CopyInit:
1573         Out << "omp_priv = ";
1574         break;
1575       case OMPDeclareReductionDecl::CallInit:
1576         break;
1577       }
1578       Init->printPretty(Out, nullptr, Policy, 0);
1579       if (D->getInitializerKind() == OMPDeclareReductionDecl::DirectInit)
1580         Out << ")";
1581       Out << ")";
1582     }
1583   }
1584 }
1585 
1586 void DeclPrinter::VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D) {
1587   D->getInit()->printPretty(Out, nullptr, Policy, Indentation);
1588 }
1589 
1590