1 //===--- DeclPrinter.cpp - Printing implementation for Decl ASTs ----------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements the Decl::print method, which pretty prints the
10 // AST back out to C/Objective-C/C++/Objective-C++ code.
11 //
12 //===----------------------------------------------------------------------===//
13 #include "clang/AST/ASTContext.h"
14 #include "clang/AST/Attr.h"
15 #include "clang/AST/Decl.h"
16 #include "clang/AST/DeclCXX.h"
17 #include "clang/AST/DeclObjC.h"
18 #include "clang/AST/DeclTemplate.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 VisitOMPAllocateDecl(OMPAllocateDecl *D);
104     void VisitOMPRequiresDecl(OMPRequiresDecl *D);
105     void VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D);
106     void VisitOMPDeclareMapperDecl(OMPDeclareMapperDecl *D);
107     void VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D);
108 
109     void printTemplateParameters(const TemplateParameterList *Params,
110                                  bool OmitTemplateKW = false);
111     void printTemplateArguments(const TemplateArgumentList &Args,
112                                 const TemplateParameterList *Params = nullptr);
113     void prettyPrintAttributes(Decl *D);
114     void prettyPrintPragmas(Decl *D);
115     void printDeclType(QualType T, StringRef DeclName, bool Pack = false);
116   };
117 }
118 
119 void Decl::print(raw_ostream &Out, unsigned Indentation,
120                  bool PrintInstantiation) const {
121   print(Out, getASTContext().getPrintingPolicy(), Indentation, PrintInstantiation);
122 }
123 
124 void Decl::print(raw_ostream &Out, const PrintingPolicy &Policy,
125                  unsigned Indentation, bool PrintInstantiation) const {
126   DeclPrinter Printer(Out, Policy, getASTContext(), Indentation,
127                       PrintInstantiation);
128   Printer.Visit(const_cast<Decl*>(this));
129 }
130 
131 void TemplateParameterList::print(raw_ostream &Out, const ASTContext &Context,
132                                   bool OmitTemplateKW) const {
133   print(Out, Context, Context.getPrintingPolicy(), OmitTemplateKW);
134 }
135 
136 void TemplateParameterList::print(raw_ostream &Out, const ASTContext &Context,
137                                   const PrintingPolicy &Policy,
138                                   bool OmitTemplateKW) const {
139   DeclPrinter Printer(Out, Policy, Context);
140   Printer.printTemplateParameters(this, OmitTemplateKW);
141 }
142 
143 static QualType GetBaseType(QualType T) {
144   // FIXME: This should be on the Type class!
145   QualType BaseType = T;
146   while (!BaseType->isSpecifierType()) {
147     if (const PointerType *PTy = BaseType->getAs<PointerType>())
148       BaseType = PTy->getPointeeType();
149     else if (const BlockPointerType *BPy = BaseType->getAs<BlockPointerType>())
150       BaseType = BPy->getPointeeType();
151     else if (const ArrayType* ATy = dyn_cast<ArrayType>(BaseType))
152       BaseType = ATy->getElementType();
153     else if (const FunctionType* FTy = BaseType->getAs<FunctionType>())
154       BaseType = FTy->getReturnType();
155     else if (const VectorType *VTy = BaseType->getAs<VectorType>())
156       BaseType = VTy->getElementType();
157     else if (const ReferenceType *RTy = BaseType->getAs<ReferenceType>())
158       BaseType = RTy->getPointeeType();
159     else if (const AutoType *ATy = BaseType->getAs<AutoType>())
160       BaseType = ATy->getDeducedType();
161     else if (const ParenType *PTy = BaseType->getAs<ParenType>())
162       BaseType = PTy->desugar();
163     else
164       // This must be a syntax error.
165       break;
166   }
167   return BaseType;
168 }
169 
170 static QualType getDeclType(Decl* D) {
171   if (TypedefNameDecl* TDD = dyn_cast<TypedefNameDecl>(D))
172     return TDD->getUnderlyingType();
173   if (ValueDecl* VD = dyn_cast<ValueDecl>(D))
174     return VD->getType();
175   return QualType();
176 }
177 
178 void Decl::printGroup(Decl** Begin, unsigned NumDecls,
179                       raw_ostream &Out, const PrintingPolicy &Policy,
180                       unsigned Indentation) {
181   if (NumDecls == 1) {
182     (*Begin)->print(Out, Policy, Indentation);
183     return;
184   }
185 
186   Decl** End = Begin + NumDecls;
187   TagDecl* TD = dyn_cast<TagDecl>(*Begin);
188   if (TD)
189     ++Begin;
190 
191   PrintingPolicy SubPolicy(Policy);
192 
193   bool isFirst = true;
194   for ( ; Begin != End; ++Begin) {
195     if (isFirst) {
196       if(TD)
197         SubPolicy.IncludeTagDefinition = true;
198       SubPolicy.SuppressSpecifiers = false;
199       isFirst = false;
200     } else {
201       if (!isFirst) Out << ", ";
202       SubPolicy.IncludeTagDefinition = false;
203       SubPolicy.SuppressSpecifiers = true;
204     }
205 
206     (*Begin)->print(Out, SubPolicy, Indentation);
207   }
208 }
209 
210 LLVM_DUMP_METHOD void DeclContext::dumpDeclContext() const {
211   // Get the translation unit
212   const DeclContext *DC = this;
213   while (!DC->isTranslationUnit())
214     DC = DC->getParent();
215 
216   ASTContext &Ctx = cast<TranslationUnitDecl>(DC)->getASTContext();
217   DeclPrinter Printer(llvm::errs(), Ctx.getPrintingPolicy(), Ctx, 0);
218   Printer.VisitDeclContext(const_cast<DeclContext *>(this), /*Indent=*/false);
219 }
220 
221 raw_ostream& DeclPrinter::Indent(unsigned Indentation) {
222   for (unsigned i = 0; i != Indentation; ++i)
223     Out << "  ";
224   return Out;
225 }
226 
227 void DeclPrinter::prettyPrintAttributes(Decl *D) {
228   if (Policy.PolishForDeclaration)
229     return;
230 
231   if (D->hasAttrs()) {
232     AttrVec &Attrs = D->getAttrs();
233     for (auto *A : Attrs) {
234       if (A->isInherited() || A->isImplicit())
235         continue;
236       switch (A->getKind()) {
237 #define ATTR(X)
238 #define PRAGMA_SPELLING_ATTR(X) case attr::X:
239 #include "clang/Basic/AttrList.inc"
240         break;
241       default:
242         A->printPretty(Out, Policy);
243         break;
244       }
245     }
246   }
247 }
248 
249 void DeclPrinter::prettyPrintPragmas(Decl *D) {
250   if (Policy.PolishForDeclaration)
251     return;
252 
253   if (D->hasAttrs()) {
254     AttrVec &Attrs = D->getAttrs();
255     for (auto *A : Attrs) {
256       switch (A->getKind()) {
257 #define ATTR(X)
258 #define PRAGMA_SPELLING_ATTR(X) case attr::X:
259 #include "clang/Basic/AttrList.inc"
260         A->printPretty(Out, Policy);
261         Indent();
262         break;
263       default:
264         break;
265       }
266     }
267   }
268 }
269 
270 void DeclPrinter::printDeclType(QualType T, StringRef DeclName, bool Pack) {
271   // Normally, a PackExpansionType is written as T[3]... (for instance, as a
272   // template argument), but if it is the type of a declaration, the ellipsis
273   // is placed before the name being declared.
274   if (auto *PET = T->getAs<PackExpansionType>()) {
275     Pack = true;
276     T = PET->getPattern();
277   }
278   T.print(Out, Policy, (Pack ? "..." : "") + DeclName, Indentation);
279 }
280 
281 void DeclPrinter::ProcessDeclGroup(SmallVectorImpl<Decl*>& Decls) {
282   this->Indent();
283   Decl::printGroup(Decls.data(), Decls.size(), Out, Policy, Indentation);
284   Out << ";\n";
285   Decls.clear();
286 
287 }
288 
289 void DeclPrinter::Print(AccessSpecifier AS) {
290   switch(AS) {
291   case AS_none:      llvm_unreachable("No access specifier!");
292   case AS_public:    Out << "public"; break;
293   case AS_protected: Out << "protected"; break;
294   case AS_private:   Out << "private"; break;
295   }
296 }
297 
298 void DeclPrinter::PrintConstructorInitializers(CXXConstructorDecl *CDecl,
299                                                std::string &Proto) {
300   bool HasInitializerList = false;
301   for (const auto *BMInitializer : CDecl->inits()) {
302     if (BMInitializer->isInClassMemberInitializer())
303       continue;
304 
305     if (!HasInitializerList) {
306       Proto += " : ";
307       Out << Proto;
308       Proto.clear();
309       HasInitializerList = true;
310     } else
311       Out << ", ";
312 
313     if (BMInitializer->isAnyMemberInitializer()) {
314       FieldDecl *FD = BMInitializer->getAnyMember();
315       Out << *FD;
316     } else {
317       Out << QualType(BMInitializer->getBaseClass(), 0).getAsString(Policy);
318     }
319 
320     Out << "(";
321     if (!BMInitializer->getInit()) {
322       // Nothing to print
323     } else {
324       Expr *Init = BMInitializer->getInit();
325       if (ExprWithCleanups *Tmp = dyn_cast<ExprWithCleanups>(Init))
326         Init = Tmp->getSubExpr();
327 
328       Init = Init->IgnoreParens();
329 
330       Expr *SimpleInit = nullptr;
331       Expr **Args = nullptr;
332       unsigned NumArgs = 0;
333       if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
334         Args = ParenList->getExprs();
335         NumArgs = ParenList->getNumExprs();
336       } else if (CXXConstructExpr *Construct =
337                      dyn_cast<CXXConstructExpr>(Init)) {
338         Args = Construct->getArgs();
339         NumArgs = Construct->getNumArgs();
340       } else
341         SimpleInit = Init;
342 
343       if (SimpleInit)
344         SimpleInit->printPretty(Out, nullptr, Policy, Indentation);
345       else {
346         for (unsigned I = 0; I != NumArgs; ++I) {
347           assert(Args[I] != nullptr && "Expected non-null Expr");
348           if (isa<CXXDefaultArgExpr>(Args[I]))
349             break;
350 
351           if (I)
352             Out << ", ";
353           Args[I]->printPretty(Out, nullptr, Policy, Indentation);
354         }
355       }
356     }
357     Out << ")";
358     if (BMInitializer->isPackExpansion())
359       Out << "...";
360   }
361 }
362 
363 //----------------------------------------------------------------------------
364 // Common C declarations
365 //----------------------------------------------------------------------------
366 
367 void DeclPrinter::VisitDeclContext(DeclContext *DC, bool Indent) {
368   if (Policy.TerseOutput)
369     return;
370 
371   if (Indent)
372     Indentation += Policy.Indentation;
373 
374   SmallVector<Decl*, 2> Decls;
375   for (DeclContext::decl_iterator D = DC->decls_begin(), DEnd = DC->decls_end();
376        D != DEnd; ++D) {
377 
378     // Don't print ObjCIvarDecls, as they are printed when visiting the
379     // containing ObjCInterfaceDecl.
380     if (isa<ObjCIvarDecl>(*D))
381       continue;
382 
383     // Skip over implicit declarations in pretty-printing mode.
384     if (D->isImplicit())
385       continue;
386 
387     // Don't print implicit specializations, as they are printed when visiting
388     // corresponding templates.
389     if (auto FD = dyn_cast<FunctionDecl>(*D))
390       if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation &&
391           !isa<ClassTemplateSpecializationDecl>(DC))
392         continue;
393 
394     // The next bits of code handle stuff like "struct {int x;} a,b"; we're
395     // forced to merge the declarations because there's no other way to
396     // refer to the struct in question.  When that struct is named instead, we
397     // also need to merge to avoid splitting off a stand-alone struct
398     // declaration that produces the warning ext_no_declarators in some
399     // contexts.
400     //
401     // This limited merging is safe without a bunch of other checks because it
402     // only merges declarations directly referring to the tag, not typedefs.
403     //
404     // Check whether the current declaration should be grouped with a previous
405     // non-free-standing tag declaration.
406     QualType CurDeclType = getDeclType(*D);
407     if (!Decls.empty() && !CurDeclType.isNull()) {
408       QualType BaseType = GetBaseType(CurDeclType);
409       if (!BaseType.isNull() && isa<ElaboratedType>(BaseType) &&
410           cast<ElaboratedType>(BaseType)->getOwnedTagDecl() == Decls[0]) {
411         Decls.push_back(*D);
412         continue;
413       }
414     }
415 
416     // If we have a merged group waiting to be handled, handle it now.
417     if (!Decls.empty())
418       ProcessDeclGroup(Decls);
419 
420     // If the current declaration is not a free standing declaration, save it
421     // so we can merge it with the subsequent declaration(s) using it.
422     if (isa<TagDecl>(*D) && !cast<TagDecl>(*D)->isFreeStanding()) {
423       Decls.push_back(*D);
424       continue;
425     }
426 
427     if (isa<AccessSpecDecl>(*D)) {
428       Indentation -= Policy.Indentation;
429       this->Indent();
430       Print(D->getAccess());
431       Out << ":\n";
432       Indentation += Policy.Indentation;
433       continue;
434     }
435 
436     this->Indent();
437     Visit(*D);
438 
439     // FIXME: Need to be able to tell the DeclPrinter when
440     const char *Terminator = nullptr;
441     if (isa<OMPThreadPrivateDecl>(*D) || isa<OMPDeclareReductionDecl>(*D) ||
442         isa<OMPDeclareMapperDecl>(*D) || isa<OMPRequiresDecl>(*D) ||
443         isa<OMPAllocateDecl>(*D))
444       Terminator = nullptr;
445     else if (isa<ObjCMethodDecl>(*D) && cast<ObjCMethodDecl>(*D)->hasBody())
446       Terminator = nullptr;
447     else if (auto FD = dyn_cast<FunctionDecl>(*D)) {
448       if (FD->isThisDeclarationADefinition())
449         Terminator = nullptr;
450       else
451         Terminator = ";";
452     } else if (auto TD = dyn_cast<FunctionTemplateDecl>(*D)) {
453       if (TD->getTemplatedDecl()->isThisDeclarationADefinition())
454         Terminator = nullptr;
455       else
456         Terminator = ";";
457     } else if (isa<NamespaceDecl>(*D) || isa<LinkageSpecDecl>(*D) ||
458              isa<ObjCImplementationDecl>(*D) ||
459              isa<ObjCInterfaceDecl>(*D) ||
460              isa<ObjCProtocolDecl>(*D) ||
461              isa<ObjCCategoryImplDecl>(*D) ||
462              isa<ObjCCategoryDecl>(*D))
463       Terminator = nullptr;
464     else if (isa<EnumConstantDecl>(*D)) {
465       DeclContext::decl_iterator Next = D;
466       ++Next;
467       if (Next != DEnd)
468         Terminator = ",";
469     } else
470       Terminator = ";";
471 
472     if (Terminator)
473       Out << Terminator;
474     if (!Policy.TerseOutput &&
475         ((isa<FunctionDecl>(*D) &&
476           cast<FunctionDecl>(*D)->doesThisDeclarationHaveABody()) ||
477          (isa<FunctionTemplateDecl>(*D) &&
478           cast<FunctionTemplateDecl>(*D)->getTemplatedDecl()->doesThisDeclarationHaveABody())))
479       ; // StmtPrinter already added '\n' after CompoundStmt.
480     else
481       Out << "\n";
482 
483     // Declare target attribute is special one, natural spelling for the pragma
484     // assumes "ending" construct so print it here.
485     if (D->hasAttr<OMPDeclareTargetDeclAttr>())
486       Out << "#pragma omp end declare target\n";
487   }
488 
489   if (!Decls.empty())
490     ProcessDeclGroup(Decls);
491 
492   if (Indent)
493     Indentation -= Policy.Indentation;
494 }
495 
496 void DeclPrinter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
497   VisitDeclContext(D, false);
498 }
499 
500 void DeclPrinter::VisitTypedefDecl(TypedefDecl *D) {
501   if (!Policy.SuppressSpecifiers) {
502     Out << "typedef ";
503 
504     if (D->isModulePrivate())
505       Out << "__module_private__ ";
506   }
507   QualType Ty = D->getTypeSourceInfo()->getType();
508   Ty.print(Out, Policy, D->getName(), Indentation);
509   prettyPrintAttributes(D);
510 }
511 
512 void DeclPrinter::VisitTypeAliasDecl(TypeAliasDecl *D) {
513   Out << "using " << *D;
514   prettyPrintAttributes(D);
515   Out << " = " << D->getTypeSourceInfo()->getType().getAsString(Policy);
516 }
517 
518 void DeclPrinter::VisitEnumDecl(EnumDecl *D) {
519   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
520     Out << "__module_private__ ";
521   Out << "enum";
522   if (D->isScoped()) {
523     if (D->isScopedUsingClassTag())
524       Out << " class";
525     else
526       Out << " struct";
527   }
528 
529   prettyPrintAttributes(D);
530 
531   Out << ' ' << *D;
532 
533   if (D->isFixed() && D->getASTContext().getLangOpts().CPlusPlus11)
534     Out << " : " << D->getIntegerType().stream(Policy);
535 
536   if (D->isCompleteDefinition()) {
537     Out << " {\n";
538     VisitDeclContext(D);
539     Indent() << "}";
540   }
541 }
542 
543 void DeclPrinter::VisitRecordDecl(RecordDecl *D) {
544   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
545     Out << "__module_private__ ";
546   Out << D->getKindName();
547 
548   prettyPrintAttributes(D);
549 
550   if (D->getIdentifier())
551     Out << ' ' << *D;
552 
553   if (D->isCompleteDefinition()) {
554     Out << " {\n";
555     VisitDeclContext(D);
556     Indent() << "}";
557   }
558 }
559 
560 void DeclPrinter::VisitEnumConstantDecl(EnumConstantDecl *D) {
561   Out << *D;
562   prettyPrintAttributes(D);
563   if (Expr *Init = D->getInitExpr()) {
564     Out << " = ";
565     Init->printPretty(Out, nullptr, Policy, Indentation, "\n", &Context);
566   }
567 }
568 
569 static void printExplicitSpecifier(ExplicitSpecifier ES, llvm::raw_ostream &Out,
570                                    PrintingPolicy &Policy,
571                                    unsigned Indentation) {
572   std::string Proto = "explicit";
573   llvm::raw_string_ostream EOut(Proto);
574   if (ES.getExpr()) {
575     EOut << "(";
576     ES.getExpr()->printPretty(EOut, nullptr, Policy, Indentation);
577     EOut << ")";
578   }
579   EOut << " ";
580   EOut.flush();
581   Out << EOut.str();
582 }
583 
584 void DeclPrinter::VisitFunctionDecl(FunctionDecl *D) {
585   if (!D->getDescribedFunctionTemplate() &&
586       !D->isFunctionTemplateSpecialization())
587     prettyPrintPragmas(D);
588 
589   if (D->isFunctionTemplateSpecialization())
590     Out << "template<> ";
591   else if (!D->getDescribedFunctionTemplate()) {
592     for (unsigned I = 0, NumTemplateParams = D->getNumTemplateParameterLists();
593          I < NumTemplateParams; ++I)
594       printTemplateParameters(D->getTemplateParameterList(I));
595   }
596 
597   CXXConstructorDecl *CDecl = dyn_cast<CXXConstructorDecl>(D);
598   CXXConversionDecl *ConversionDecl = dyn_cast<CXXConversionDecl>(D);
599   CXXDeductionGuideDecl *GuideDecl = dyn_cast<CXXDeductionGuideDecl>(D);
600   if (!Policy.SuppressSpecifiers) {
601     switch (D->getStorageClass()) {
602     case SC_None: break;
603     case SC_Extern: Out << "extern "; break;
604     case SC_Static: Out << "static "; break;
605     case SC_PrivateExtern: Out << "__private_extern__ "; break;
606     case SC_Auto: case SC_Register:
607       llvm_unreachable("invalid for functions");
608     }
609 
610     if (D->isInlineSpecified())  Out << "inline ";
611     if (D->isVirtualAsWritten()) Out << "virtual ";
612     if (D->isModulePrivate())    Out << "__module_private__ ";
613     if (D->isConstexpr() && !D->isExplicitlyDefaulted()) Out << "constexpr ";
614     ExplicitSpecifier ExplicitSpec = ExplicitSpecifier::getFromDecl(D);
615     if (ExplicitSpec.isSpecified())
616       printExplicitSpecifier(ExplicitSpec, Out, Policy, Indentation);
617   }
618 
619   PrintingPolicy SubPolicy(Policy);
620   SubPolicy.SuppressSpecifiers = false;
621   std::string Proto;
622 
623   if (Policy.FullyQualifiedName) {
624     Proto += D->getQualifiedNameAsString();
625   } else {
626     if (!Policy.SuppressScope) {
627       if (const NestedNameSpecifier *NS = D->getQualifier()) {
628         llvm::raw_string_ostream OS(Proto);
629         NS->print(OS, Policy);
630       }
631     }
632     Proto += D->getNameInfo().getAsString();
633   }
634 
635   if (GuideDecl)
636     Proto = GuideDecl->getDeducedTemplate()->getDeclName().getAsString();
637   if (const TemplateArgumentList *TArgs = D->getTemplateSpecializationArgs()) {
638     llvm::raw_string_ostream POut(Proto);
639     DeclPrinter TArgPrinter(POut, SubPolicy, Context, Indentation);
640     TArgPrinter.printTemplateArguments(*TArgs);
641   }
642 
643   QualType Ty = D->getType();
644   while (const ParenType *PT = dyn_cast<ParenType>(Ty)) {
645     Proto = '(' + Proto + ')';
646     Ty = PT->getInnerType();
647   }
648 
649   if (const FunctionType *AFT = Ty->getAs<FunctionType>()) {
650     const FunctionProtoType *FT = nullptr;
651     if (D->hasWrittenPrototype())
652       FT = dyn_cast<FunctionProtoType>(AFT);
653 
654     Proto += "(";
655     if (FT) {
656       llvm::raw_string_ostream POut(Proto);
657       DeclPrinter ParamPrinter(POut, SubPolicy, Context, Indentation);
658       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
659         if (i) POut << ", ";
660         ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
661       }
662 
663       if (FT->isVariadic()) {
664         if (D->getNumParams()) POut << ", ";
665         POut << "...";
666       }
667     } else if (D->doesThisDeclarationHaveABody() && !D->hasPrototype()) {
668       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
669         if (i)
670           Proto += ", ";
671         Proto += D->getParamDecl(i)->getNameAsString();
672       }
673     }
674 
675     Proto += ")";
676 
677     if (FT) {
678       if (FT->isConst())
679         Proto += " const";
680       if (FT->isVolatile())
681         Proto += " volatile";
682       if (FT->isRestrict())
683         Proto += " restrict";
684 
685       switch (FT->getRefQualifier()) {
686       case RQ_None:
687         break;
688       case RQ_LValue:
689         Proto += " &";
690         break;
691       case RQ_RValue:
692         Proto += " &&";
693         break;
694       }
695     }
696 
697     if (FT && FT->hasDynamicExceptionSpec()) {
698       Proto += " throw(";
699       if (FT->getExceptionSpecType() == EST_MSAny)
700         Proto += "...";
701       else
702         for (unsigned I = 0, N = FT->getNumExceptions(); I != N; ++I) {
703           if (I)
704             Proto += ", ";
705 
706           Proto += FT->getExceptionType(I).getAsString(SubPolicy);
707         }
708       Proto += ")";
709     } else if (FT && isNoexceptExceptionSpec(FT->getExceptionSpecType())) {
710       Proto += " noexcept";
711       if (isComputedNoexcept(FT->getExceptionSpecType())) {
712         Proto += "(";
713         llvm::raw_string_ostream EOut(Proto);
714         FT->getNoexceptExpr()->printPretty(EOut, nullptr, SubPolicy,
715                                            Indentation);
716         EOut.flush();
717         Proto += EOut.str();
718         Proto += ")";
719       }
720     }
721 
722     if (CDecl) {
723       if (!Policy.TerseOutput)
724         PrintConstructorInitializers(CDecl, Proto);
725     } else if (!ConversionDecl && !isa<CXXDestructorDecl>(D)) {
726       if (FT && FT->hasTrailingReturn()) {
727         if (!GuideDecl)
728           Out << "auto ";
729         Out << Proto << " -> ";
730         Proto.clear();
731       }
732       AFT->getReturnType().print(Out, Policy, Proto);
733       Proto.clear();
734     }
735     Out << Proto;
736   } else {
737     Ty.print(Out, Policy, Proto);
738   }
739 
740   prettyPrintAttributes(D);
741 
742   if (D->isPure())
743     Out << " = 0";
744   else if (D->isDeletedAsWritten())
745     Out << " = delete";
746   else if (D->isExplicitlyDefaulted())
747     Out << " = default";
748   else if (D->doesThisDeclarationHaveABody()) {
749     if (!Policy.TerseOutput) {
750       if (!D->hasPrototype() && D->getNumParams()) {
751         // This is a K&R function definition, so we need to print the
752         // parameters.
753         Out << '\n';
754         DeclPrinter ParamPrinter(Out, SubPolicy, Context, Indentation);
755         Indentation += Policy.Indentation;
756         for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
757           Indent();
758           ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
759           Out << ";\n";
760         }
761         Indentation -= Policy.Indentation;
762       } else
763         Out << ' ';
764 
765       if (D->getBody())
766         D->getBody()->printPretty(Out, nullptr, SubPolicy, Indentation);
767     } else {
768       if (!Policy.TerseOutput && isa<CXXConstructorDecl>(*D))
769         Out << " {}";
770     }
771   }
772 }
773 
774 void DeclPrinter::VisitFriendDecl(FriendDecl *D) {
775   if (TypeSourceInfo *TSI = D->getFriendType()) {
776     unsigned NumTPLists = D->getFriendTypeNumTemplateParameterLists();
777     for (unsigned i = 0; i < NumTPLists; ++i)
778       printTemplateParameters(D->getFriendTypeTemplateParameterList(i));
779     Out << "friend ";
780     Out << " " << TSI->getType().getAsString(Policy);
781   }
782   else if (FunctionDecl *FD =
783       dyn_cast<FunctionDecl>(D->getFriendDecl())) {
784     Out << "friend ";
785     VisitFunctionDecl(FD);
786   }
787   else if (FunctionTemplateDecl *FTD =
788            dyn_cast<FunctionTemplateDecl>(D->getFriendDecl())) {
789     Out << "friend ";
790     VisitFunctionTemplateDecl(FTD);
791   }
792   else if (ClassTemplateDecl *CTD =
793            dyn_cast<ClassTemplateDecl>(D->getFriendDecl())) {
794     Out << "friend ";
795     VisitRedeclarableTemplateDecl(CTD);
796   }
797 }
798 
799 void DeclPrinter::VisitFieldDecl(FieldDecl *D) {
800   // FIXME: add printing of pragma attributes if required.
801   if (!Policy.SuppressSpecifiers && D->isMutable())
802     Out << "mutable ";
803   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
804     Out << "__module_private__ ";
805 
806   Out << D->getASTContext().getUnqualifiedObjCPointerType(D->getType()).
807          stream(Policy, D->getName(), Indentation);
808 
809   if (D->isBitField()) {
810     Out << " : ";
811     D->getBitWidth()->printPretty(Out, nullptr, Policy, Indentation);
812   }
813 
814   Expr *Init = D->getInClassInitializer();
815   if (!Policy.SuppressInitializers && Init) {
816     if (D->getInClassInitStyle() == ICIS_ListInit)
817       Out << " ";
818     else
819       Out << " = ";
820     Init->printPretty(Out, nullptr, Policy, Indentation);
821   }
822   prettyPrintAttributes(D);
823 }
824 
825 void DeclPrinter::VisitLabelDecl(LabelDecl *D) {
826   Out << *D << ":";
827 }
828 
829 void DeclPrinter::VisitVarDecl(VarDecl *D) {
830   prettyPrintPragmas(D);
831 
832   QualType T = D->getTypeSourceInfo()
833     ? D->getTypeSourceInfo()->getType()
834     : D->getASTContext().getUnqualifiedObjCPointerType(D->getType());
835 
836   if (!Policy.SuppressSpecifiers) {
837     StorageClass SC = D->getStorageClass();
838     if (SC != SC_None)
839       Out << VarDecl::getStorageClassSpecifierString(SC) << " ";
840 
841     switch (D->getTSCSpec()) {
842     case TSCS_unspecified:
843       break;
844     case TSCS___thread:
845       Out << "__thread ";
846       break;
847     case TSCS__Thread_local:
848       Out << "_Thread_local ";
849       break;
850     case TSCS_thread_local:
851       Out << "thread_local ";
852       break;
853     }
854 
855     if (D->isModulePrivate())
856       Out << "__module_private__ ";
857 
858     if (D->isConstexpr()) {
859       Out << "constexpr ";
860       T.removeLocalConst();
861     }
862   }
863 
864   printDeclType(T, D->getName());
865   Expr *Init = D->getInit();
866   if (!Policy.SuppressInitializers && Init) {
867     bool ImplicitInit = false;
868     if (CXXConstructExpr *Construct =
869             dyn_cast<CXXConstructExpr>(Init->IgnoreImplicit())) {
870       if (D->getInitStyle() == VarDecl::CallInit &&
871           !Construct->isListInitialization()) {
872         ImplicitInit = Construct->getNumArgs() == 0 ||
873           Construct->getArg(0)->isDefaultArgument();
874       }
875     }
876     if (!ImplicitInit) {
877       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
878         Out << "(";
879       else if (D->getInitStyle() == VarDecl::CInit) {
880         Out << " = ";
881       }
882       PrintingPolicy SubPolicy(Policy);
883       SubPolicy.SuppressSpecifiers = false;
884       SubPolicy.IncludeTagDefinition = false;
885       Init->printPretty(Out, nullptr, SubPolicy, Indentation);
886       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
887         Out << ")";
888     }
889   }
890   prettyPrintAttributes(D);
891 }
892 
893 void DeclPrinter::VisitParmVarDecl(ParmVarDecl *D) {
894   VisitVarDecl(D);
895 }
896 
897 void DeclPrinter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
898   Out << "__asm (";
899   D->getAsmString()->printPretty(Out, nullptr, Policy, Indentation);
900   Out << ")";
901 }
902 
903 void DeclPrinter::VisitImportDecl(ImportDecl *D) {
904   Out << "@import " << D->getImportedModule()->getFullModuleName()
905       << ";\n";
906 }
907 
908 void DeclPrinter::VisitStaticAssertDecl(StaticAssertDecl *D) {
909   Out << "static_assert(";
910   D->getAssertExpr()->printPretty(Out, nullptr, Policy, Indentation);
911   if (StringLiteral *SL = D->getMessage()) {
912     Out << ", ";
913     SL->printPretty(Out, nullptr, Policy, Indentation);
914   }
915   Out << ")";
916 }
917 
918 //----------------------------------------------------------------------------
919 // C++ declarations
920 //----------------------------------------------------------------------------
921 void DeclPrinter::VisitNamespaceDecl(NamespaceDecl *D) {
922   if (D->isInline())
923     Out << "inline ";
924   Out << "namespace " << *D << " {\n";
925   VisitDeclContext(D);
926   Indent() << "}";
927 }
928 
929 void DeclPrinter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
930   Out << "using namespace ";
931   if (D->getQualifier())
932     D->getQualifier()->print(Out, Policy);
933   Out << *D->getNominatedNamespaceAsWritten();
934 }
935 
936 void DeclPrinter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
937   Out << "namespace " << *D << " = ";
938   if (D->getQualifier())
939     D->getQualifier()->print(Out, Policy);
940   Out << *D->getAliasedNamespace();
941 }
942 
943 void DeclPrinter::VisitEmptyDecl(EmptyDecl *D) {
944   prettyPrintAttributes(D);
945 }
946 
947 void DeclPrinter::VisitCXXRecordDecl(CXXRecordDecl *D) {
948   // FIXME: add printing of pragma attributes if required.
949   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
950     Out << "__module_private__ ";
951   Out << D->getKindName();
952 
953   prettyPrintAttributes(D);
954 
955   if (D->getIdentifier()) {
956     Out << ' ' << *D;
957 
958     if (auto S = dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
959       printTemplateArguments(S->getTemplateArgs(), S->getTemplateParameters());
960     else if (auto S = dyn_cast<ClassTemplateSpecializationDecl>(D))
961       printTemplateArguments(S->getTemplateArgs());
962   }
963 
964   if (D->isCompleteDefinition()) {
965     // Print the base classes
966     if (D->getNumBases()) {
967       Out << " : ";
968       for (CXXRecordDecl::base_class_iterator Base = D->bases_begin(),
969              BaseEnd = D->bases_end(); Base != BaseEnd; ++Base) {
970         if (Base != D->bases_begin())
971           Out << ", ";
972 
973         if (Base->isVirtual())
974           Out << "virtual ";
975 
976         AccessSpecifier AS = Base->getAccessSpecifierAsWritten();
977         if (AS != AS_none) {
978           Print(AS);
979           Out << " ";
980         }
981         Out << Base->getType().getAsString(Policy);
982 
983         if (Base->isPackExpansion())
984           Out << "...";
985       }
986     }
987 
988     // Print the class definition
989     // FIXME: Doesn't print access specifiers, e.g., "public:"
990     if (Policy.TerseOutput) {
991       Out << " {}";
992     } else {
993       Out << " {\n";
994       VisitDeclContext(D);
995       Indent() << "}";
996     }
997   }
998 }
999 
1000 void DeclPrinter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
1001   const char *l;
1002   if (D->getLanguage() == LinkageSpecDecl::lang_c)
1003     l = "C";
1004   else {
1005     assert(D->getLanguage() == LinkageSpecDecl::lang_cxx &&
1006            "unknown language in linkage specification");
1007     l = "C++";
1008   }
1009 
1010   Out << "extern \"" << l << "\" ";
1011   if (D->hasBraces()) {
1012     Out << "{\n";
1013     VisitDeclContext(D);
1014     Indent() << "}";
1015   } else
1016     Visit(*D->decls_begin());
1017 }
1018 
1019 void DeclPrinter::printTemplateParameters(const TemplateParameterList *Params,
1020                                           bool OmitTemplateKW) {
1021   assert(Params);
1022 
1023   if (!OmitTemplateKW)
1024     Out << "template ";
1025   Out << '<';
1026 
1027   bool NeedComma = false;
1028   for (const Decl *Param : *Params) {
1029     if (Param->isImplicit())
1030       continue;
1031 
1032     if (NeedComma)
1033       Out << ", ";
1034     else
1035       NeedComma = true;
1036 
1037     if (auto TTP = dyn_cast<TemplateTypeParmDecl>(Param)) {
1038 
1039       if (TTP->wasDeclaredWithTypename())
1040         Out << "typename";
1041       else
1042         Out << "class";
1043 
1044       if (TTP->isParameterPack())
1045         Out << " ...";
1046       else if (!TTP->getName().empty())
1047         Out << ' ';
1048 
1049       Out << *TTP;
1050 
1051       if (TTP->hasDefaultArgument()) {
1052         Out << " = ";
1053         Out << TTP->getDefaultArgument().getAsString(Policy);
1054       };
1055     } else if (auto NTTP = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
1056       StringRef Name;
1057       if (IdentifierInfo *II = NTTP->getIdentifier())
1058         Name = II->getName();
1059       printDeclType(NTTP->getType(), Name, NTTP->isParameterPack());
1060 
1061       if (NTTP->hasDefaultArgument()) {
1062         Out << " = ";
1063         NTTP->getDefaultArgument()->printPretty(Out, nullptr, Policy,
1064                                                 Indentation);
1065       }
1066     } else if (auto TTPD = dyn_cast<TemplateTemplateParmDecl>(Param)) {
1067       VisitTemplateDecl(TTPD);
1068       // FIXME: print the default argument, if present.
1069     }
1070   }
1071 
1072   Out << '>';
1073   if (!OmitTemplateKW)
1074     Out << ' ';
1075 }
1076 
1077 void DeclPrinter::printTemplateArguments(const TemplateArgumentList &Args,
1078                                          const TemplateParameterList *Params) {
1079   Out << "<";
1080   for (size_t I = 0, E = Args.size(); I < E; ++I) {
1081     const TemplateArgument &A = Args[I];
1082     if (I)
1083       Out << ", ";
1084     if (Params) {
1085       if (A.getKind() == TemplateArgument::Type)
1086         if (auto T = A.getAsType()->getAs<TemplateTypeParmType>()) {
1087           auto P = cast<TemplateTypeParmDecl>(Params->getParam(T->getIndex()));
1088           Out << *P;
1089           continue;
1090         }
1091       if (A.getKind() == TemplateArgument::Template) {
1092         if (auto T = A.getAsTemplate().getAsTemplateDecl())
1093           if (auto TD = dyn_cast<TemplateTemplateParmDecl>(T)) {
1094             auto P = cast<TemplateTemplateParmDecl>(
1095                                               Params->getParam(TD->getIndex()));
1096             Out << *P;
1097             continue;
1098           }
1099       }
1100       if (A.getKind() == TemplateArgument::Expression) {
1101         if (auto E = dyn_cast<DeclRefExpr>(A.getAsExpr()))
1102           if (auto N = dyn_cast<NonTypeTemplateParmDecl>(E->getDecl())) {
1103             auto P = cast<NonTypeTemplateParmDecl>(
1104                                                Params->getParam(N->getIndex()));
1105             Out << *P;
1106             continue;
1107           }
1108       }
1109     }
1110     A.print(Policy, Out);
1111   }
1112   Out << ">";
1113 }
1114 
1115 void DeclPrinter::VisitTemplateDecl(const TemplateDecl *D) {
1116   printTemplateParameters(D->getTemplateParameters());
1117 
1118   if (const TemplateTemplateParmDecl *TTP =
1119         dyn_cast<TemplateTemplateParmDecl>(D)) {
1120     Out << "class ";
1121     if (TTP->isParameterPack())
1122       Out << "...";
1123     Out << D->getName();
1124   } else {
1125     Visit(D->getTemplatedDecl());
1126   }
1127 }
1128 
1129 void DeclPrinter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1130   prettyPrintPragmas(D->getTemplatedDecl());
1131   // Print any leading template parameter lists.
1132   if (const FunctionDecl *FD = D->getTemplatedDecl()) {
1133     for (unsigned I = 0, NumTemplateParams = FD->getNumTemplateParameterLists();
1134          I < NumTemplateParams; ++I)
1135       printTemplateParameters(FD->getTemplateParameterList(I));
1136   }
1137   VisitRedeclarableTemplateDecl(D);
1138   // Declare target attribute is special one, natural spelling for the pragma
1139   // assumes "ending" construct so print it here.
1140   if (D->getTemplatedDecl()->hasAttr<OMPDeclareTargetDeclAttr>())
1141     Out << "#pragma omp end declare target\n";
1142 
1143   // Never print "instantiations" for deduction guides (they don't really
1144   // have them).
1145   if (PrintInstantiation &&
1146       !isa<CXXDeductionGuideDecl>(D->getTemplatedDecl())) {
1147     FunctionDecl *PrevDecl = D->getTemplatedDecl();
1148     const FunctionDecl *Def;
1149     if (PrevDecl->isDefined(Def) && Def != PrevDecl)
1150       return;
1151     for (auto *I : D->specializations())
1152       if (I->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) {
1153         if (!PrevDecl->isThisDeclarationADefinition())
1154           Out << ";\n";
1155         Indent();
1156         prettyPrintPragmas(I);
1157         Visit(I);
1158       }
1159   }
1160 }
1161 
1162 void DeclPrinter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1163   VisitRedeclarableTemplateDecl(D);
1164 
1165   if (PrintInstantiation) {
1166     for (auto *I : D->specializations())
1167       if (I->getSpecializationKind() == TSK_ImplicitInstantiation) {
1168         if (D->isThisDeclarationADefinition())
1169           Out << ";";
1170         Out << "\n";
1171         Visit(I);
1172       }
1173   }
1174 }
1175 
1176 void DeclPrinter::VisitClassTemplateSpecializationDecl(
1177                                            ClassTemplateSpecializationDecl *D) {
1178   Out << "template<> ";
1179   VisitCXXRecordDecl(D);
1180 }
1181 
1182 void DeclPrinter::VisitClassTemplatePartialSpecializationDecl(
1183                                     ClassTemplatePartialSpecializationDecl *D) {
1184   printTemplateParameters(D->getTemplateParameters());
1185   VisitCXXRecordDecl(D);
1186 }
1187 
1188 //----------------------------------------------------------------------------
1189 // Objective-C declarations
1190 //----------------------------------------------------------------------------
1191 
1192 void DeclPrinter::PrintObjCMethodType(ASTContext &Ctx,
1193                                       Decl::ObjCDeclQualifier Quals,
1194                                       QualType T) {
1195   Out << '(';
1196   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_In)
1197     Out << "in ";
1198   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Inout)
1199     Out << "inout ";
1200   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Out)
1201     Out << "out ";
1202   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Bycopy)
1203     Out << "bycopy ";
1204   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Byref)
1205     Out << "byref ";
1206   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Oneway)
1207     Out << "oneway ";
1208   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_CSNullability) {
1209     if (auto nullability = AttributedType::stripOuterNullability(T))
1210       Out << getNullabilitySpelling(*nullability, true) << ' ';
1211   }
1212 
1213   Out << Ctx.getUnqualifiedObjCPointerType(T).getAsString(Policy);
1214   Out << ')';
1215 }
1216 
1217 void DeclPrinter::PrintObjCTypeParams(ObjCTypeParamList *Params) {
1218   Out << "<";
1219   unsigned First = true;
1220   for (auto *Param : *Params) {
1221     if (First) {
1222       First = false;
1223     } else {
1224       Out << ", ";
1225     }
1226 
1227     switch (Param->getVariance()) {
1228     case ObjCTypeParamVariance::Invariant:
1229       break;
1230 
1231     case ObjCTypeParamVariance::Covariant:
1232       Out << "__covariant ";
1233       break;
1234 
1235     case ObjCTypeParamVariance::Contravariant:
1236       Out << "__contravariant ";
1237       break;
1238     }
1239 
1240     Out << Param->getDeclName().getAsString();
1241 
1242     if (Param->hasExplicitBound()) {
1243       Out << " : " << Param->getUnderlyingType().getAsString(Policy);
1244     }
1245   }
1246   Out << ">";
1247 }
1248 
1249 void DeclPrinter::VisitObjCMethodDecl(ObjCMethodDecl *OMD) {
1250   if (OMD->isInstanceMethod())
1251     Out << "- ";
1252   else
1253     Out << "+ ";
1254   if (!OMD->getReturnType().isNull()) {
1255     PrintObjCMethodType(OMD->getASTContext(), OMD->getObjCDeclQualifier(),
1256                         OMD->getReturnType());
1257   }
1258 
1259   std::string name = OMD->getSelector().getAsString();
1260   std::string::size_type pos, lastPos = 0;
1261   for (const auto *PI : OMD->parameters()) {
1262     // FIXME: selector is missing here!
1263     pos = name.find_first_of(':', lastPos);
1264     if (lastPos != 0)
1265       Out << " ";
1266     Out << name.substr(lastPos, pos - lastPos) << ':';
1267     PrintObjCMethodType(OMD->getASTContext(),
1268                         PI->getObjCDeclQualifier(),
1269                         PI->getType());
1270     Out << *PI;
1271     lastPos = pos + 1;
1272   }
1273 
1274   if (OMD->param_begin() == OMD->param_end())
1275     Out << name;
1276 
1277   if (OMD->isVariadic())
1278       Out << ", ...";
1279 
1280   prettyPrintAttributes(OMD);
1281 
1282   if (OMD->getBody() && !Policy.TerseOutput) {
1283     Out << ' ';
1284     OMD->getBody()->printPretty(Out, nullptr, Policy);
1285   }
1286   else if (Policy.PolishForDeclaration)
1287     Out << ';';
1288 }
1289 
1290 void DeclPrinter::VisitObjCImplementationDecl(ObjCImplementationDecl *OID) {
1291   std::string I = OID->getNameAsString();
1292   ObjCInterfaceDecl *SID = OID->getSuperClass();
1293 
1294   bool eolnOut = false;
1295   if (SID)
1296     Out << "@implementation " << I << " : " << *SID;
1297   else
1298     Out << "@implementation " << I;
1299 
1300   if (OID->ivar_size() > 0) {
1301     Out << "{\n";
1302     eolnOut = true;
1303     Indentation += Policy.Indentation;
1304     for (const auto *I : OID->ivars()) {
1305       Indent() << I->getASTContext().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   VisitDeclContext(OID, false);
1316   if (!eolnOut)
1317     Out << "\n";
1318   Out << "@end";
1319 }
1320 
1321 void DeclPrinter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *OID) {
1322   std::string I = OID->getNameAsString();
1323   ObjCInterfaceDecl *SID = OID->getSuperClass();
1324 
1325   if (!OID->isThisDeclarationADefinition()) {
1326     Out << "@class " << I;
1327 
1328     if (auto TypeParams = OID->getTypeParamListAsWritten()) {
1329       PrintObjCTypeParams(TypeParams);
1330     }
1331 
1332     Out << ";";
1333     return;
1334   }
1335   bool eolnOut = false;
1336   Out << "@interface " << I;
1337 
1338   if (auto TypeParams = OID->getTypeParamListAsWritten()) {
1339     PrintObjCTypeParams(TypeParams);
1340   }
1341 
1342   if (SID)
1343     Out << " : " << QualType(OID->getSuperClassType(), 0).getAsString(Policy);
1344 
1345   // Protocols?
1346   const ObjCList<ObjCProtocolDecl> &Protocols = OID->getReferencedProtocols();
1347   if (!Protocols.empty()) {
1348     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
1349          E = Protocols.end(); I != E; ++I)
1350       Out << (I == Protocols.begin() ? '<' : ',') << **I;
1351     Out << "> ";
1352   }
1353 
1354   if (OID->ivar_size() > 0) {
1355     Out << "{\n";
1356     eolnOut = true;
1357     Indentation += Policy.Indentation;
1358     for (const auto *I : OID->ivars()) {
1359       Indent() << I->getASTContext()
1360                       .getUnqualifiedObjCPointerType(I->getType())
1361                       .getAsString(Policy) << ' ' << *I << ";\n";
1362     }
1363     Indentation -= Policy.Indentation;
1364     Out << "}\n";
1365   }
1366   else if (SID || (OID->decls_begin() != OID->decls_end())) {
1367     Out << "\n";
1368     eolnOut = true;
1369   }
1370 
1371   VisitDeclContext(OID, false);
1372   if (!eolnOut)
1373     Out << "\n";
1374   Out << "@end";
1375   // FIXME: implement the rest...
1376 }
1377 
1378 void DeclPrinter::VisitObjCProtocolDecl(ObjCProtocolDecl *PID) {
1379   if (!PID->isThisDeclarationADefinition()) {
1380     Out << "@protocol " << *PID << ";\n";
1381     return;
1382   }
1383   // Protocols?
1384   const ObjCList<ObjCProtocolDecl> &Protocols = PID->getReferencedProtocols();
1385   if (!Protocols.empty()) {
1386     Out << "@protocol " << *PID;
1387     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
1388          E = Protocols.end(); I != E; ++I)
1389       Out << (I == Protocols.begin() ? '<' : ',') << **I;
1390     Out << ">\n";
1391   } else
1392     Out << "@protocol " << *PID << '\n';
1393   VisitDeclContext(PID, false);
1394   Out << "@end";
1395 }
1396 
1397 void DeclPrinter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *PID) {
1398   Out << "@implementation " << *PID->getClassInterface() << '(' << *PID <<")\n";
1399 
1400   VisitDeclContext(PID, false);
1401   Out << "@end";
1402   // FIXME: implement the rest...
1403 }
1404 
1405 void DeclPrinter::VisitObjCCategoryDecl(ObjCCategoryDecl *PID) {
1406   Out << "@interface " << *PID->getClassInterface();
1407   if (auto TypeParams = PID->getTypeParamList()) {
1408     PrintObjCTypeParams(TypeParams);
1409   }
1410   Out << "(" << *PID << ")\n";
1411   if (PID->ivar_size() > 0) {
1412     Out << "{\n";
1413     Indentation += Policy.Indentation;
1414     for (const auto *I : PID->ivars())
1415       Indent() << I->getASTContext().getUnqualifiedObjCPointerType(I->getType()).
1416                     getAsString(Policy) << ' ' << *I << ";\n";
1417     Indentation -= Policy.Indentation;
1418     Out << "}\n";
1419   }
1420 
1421   VisitDeclContext(PID, false);
1422   Out << "@end";
1423 
1424   // FIXME: implement the rest...
1425 }
1426 
1427 void DeclPrinter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *AID) {
1428   Out << "@compatibility_alias " << *AID
1429       << ' ' << *AID->getClassInterface() << ";\n";
1430 }
1431 
1432 /// PrintObjCPropertyDecl - print a property declaration.
1433 ///
1434 /// Print attributes in the following order:
1435 /// - class
1436 /// - nonatomic | atomic
1437 /// - assign | retain | strong | copy | weak | unsafe_unretained
1438 /// - readwrite | readonly
1439 /// - getter & setter
1440 /// - nullability
1441 void DeclPrinter::VisitObjCPropertyDecl(ObjCPropertyDecl *PDecl) {
1442   if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Required)
1443     Out << "@required\n";
1444   else if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Optional)
1445     Out << "@optional\n";
1446 
1447   QualType T = PDecl->getType();
1448 
1449   Out << "@property";
1450   if (PDecl->getPropertyAttributes() != ObjCPropertyDecl::OBJC_PR_noattr) {
1451     bool first = true;
1452     Out << "(";
1453     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_class) {
1454       Out << (first ? "" : ", ") << "class";
1455       first = false;
1456     }
1457 
1458     if (PDecl->getPropertyAttributes() &
1459         ObjCPropertyDecl::OBJC_PR_nonatomic) {
1460       Out << (first ? "" : ", ") << "nonatomic";
1461       first = false;
1462     }
1463     if (PDecl->getPropertyAttributes() &
1464         ObjCPropertyDecl::OBJC_PR_atomic) {
1465       Out << (first ? "" : ", ") << "atomic";
1466       first = false;
1467     }
1468 
1469     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_assign) {
1470       Out << (first ? "" : ", ") << "assign";
1471       first = false;
1472     }
1473     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_retain) {
1474       Out << (first ? "" : ", ") << "retain";
1475       first = false;
1476     }
1477 
1478     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_strong) {
1479       Out << (first ? "" : ", ") << "strong";
1480       first = false;
1481     }
1482     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_copy) {
1483       Out << (first ? "" : ", ") << "copy";
1484       first = false;
1485     }
1486     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak) {
1487       Out << (first ? "" : ", ") << "weak";
1488       first = false;
1489     }
1490     if (PDecl->getPropertyAttributes()
1491         & ObjCPropertyDecl::OBJC_PR_unsafe_unretained) {
1492       Out << (first ? "" : ", ") << "unsafe_unretained";
1493       first = false;
1494     }
1495 
1496     if (PDecl->getPropertyAttributes() &
1497         ObjCPropertyDecl::OBJC_PR_readwrite) {
1498       Out << (first ? "" : ", ") << "readwrite";
1499       first = false;
1500     }
1501     if (PDecl->getPropertyAttributes() &
1502         ObjCPropertyDecl::OBJC_PR_readonly) {
1503       Out << (first ? "" : ", ") << "readonly";
1504       first = false;
1505     }
1506 
1507     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) {
1508       Out << (first ? "" : ", ") << "getter = ";
1509       PDecl->getGetterName().print(Out);
1510       first = false;
1511     }
1512     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) {
1513       Out << (first ? "" : ", ") << "setter = ";
1514       PDecl->getSetterName().print(Out);
1515       first = false;
1516     }
1517 
1518     if (PDecl->getPropertyAttributes() &
1519         ObjCPropertyDecl::OBJC_PR_nullability) {
1520       if (auto nullability = AttributedType::stripOuterNullability(T)) {
1521         if (*nullability == NullabilityKind::Unspecified &&
1522             (PDecl->getPropertyAttributes() &
1523                ObjCPropertyDecl::OBJC_PR_null_resettable)) {
1524           Out << (first ? "" : ", ") << "null_resettable";
1525         } else {
1526           Out << (first ? "" : ", ")
1527               << getNullabilitySpelling(*nullability, true);
1528         }
1529         first = false;
1530       }
1531     }
1532 
1533     (void) first; // Silence dead store warning due to idiomatic code.
1534     Out << ")";
1535   }
1536   std::string TypeStr = PDecl->getASTContext().getUnqualifiedObjCPointerType(T).
1537       getAsString(Policy);
1538   Out << ' ' << TypeStr;
1539   if (!StringRef(TypeStr).endswith("*"))
1540     Out << ' ';
1541   Out << *PDecl;
1542   if (Policy.PolishForDeclaration)
1543     Out << ';';
1544 }
1545 
1546 void DeclPrinter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *PID) {
1547   if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize)
1548     Out << "@synthesize ";
1549   else
1550     Out << "@dynamic ";
1551   Out << *PID->getPropertyDecl();
1552   if (PID->getPropertyIvarDecl())
1553     Out << '=' << *PID->getPropertyIvarDecl();
1554 }
1555 
1556 void DeclPrinter::VisitUsingDecl(UsingDecl *D) {
1557   if (!D->isAccessDeclaration())
1558     Out << "using ";
1559   if (D->hasTypename())
1560     Out << "typename ";
1561   D->getQualifier()->print(Out, Policy);
1562 
1563   // Use the correct record name when the using declaration is used for
1564   // inheriting constructors.
1565   for (const auto *Shadow : D->shadows()) {
1566     if (const auto *ConstructorShadow =
1567             dyn_cast<ConstructorUsingShadowDecl>(Shadow)) {
1568       assert(Shadow->getDeclContext() == ConstructorShadow->getDeclContext());
1569       Out << *ConstructorShadow->getNominatedBaseClass();
1570       return;
1571     }
1572   }
1573   Out << *D;
1574 }
1575 
1576 void
1577 DeclPrinter::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) {
1578   Out << "using typename ";
1579   D->getQualifier()->print(Out, Policy);
1580   Out << D->getDeclName();
1581 }
1582 
1583 void DeclPrinter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1584   if (!D->isAccessDeclaration())
1585     Out << "using ";
1586   D->getQualifier()->print(Out, Policy);
1587   Out << D->getDeclName();
1588 }
1589 
1590 void DeclPrinter::VisitUsingShadowDecl(UsingShadowDecl *D) {
1591   // ignore
1592 }
1593 
1594 void DeclPrinter::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
1595   Out << "#pragma omp threadprivate";
1596   if (!D->varlist_empty()) {
1597     for (OMPThreadPrivateDecl::varlist_iterator I = D->varlist_begin(),
1598                                                 E = D->varlist_end();
1599                                                 I != E; ++I) {
1600       Out << (I == D->varlist_begin() ? '(' : ',');
1601       NamedDecl *ND = cast<DeclRefExpr>(*I)->getDecl();
1602       ND->printQualifiedName(Out);
1603     }
1604     Out << ")";
1605   }
1606 }
1607 
1608 void DeclPrinter::VisitOMPAllocateDecl(OMPAllocateDecl *D) {
1609   Out << "#pragma omp allocate";
1610   if (!D->varlist_empty()) {
1611     for (OMPAllocateDecl::varlist_iterator I = D->varlist_begin(),
1612                                            E = D->varlist_end();
1613          I != E; ++I) {
1614       Out << (I == D->varlist_begin() ? '(' : ',');
1615       NamedDecl *ND = cast<DeclRefExpr>(*I)->getDecl();
1616       ND->printQualifiedName(Out);
1617     }
1618     Out << ")";
1619   }
1620   if (!D->clauselist_empty()) {
1621     Out << " ";
1622     OMPClausePrinter Printer(Out, Policy);
1623     for (OMPClause *C : D->clauselists())
1624       Printer.Visit(C);
1625   }
1626 }
1627 
1628 void DeclPrinter::VisitOMPRequiresDecl(OMPRequiresDecl *D) {
1629   Out << "#pragma omp requires ";
1630   if (!D->clauselist_empty()) {
1631     OMPClausePrinter Printer(Out, Policy);
1632     for (auto I = D->clauselist_begin(), E = D->clauselist_end(); I != E; ++I)
1633       Printer.Visit(*I);
1634   }
1635 }
1636 
1637 void DeclPrinter::VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D) {
1638   if (!D->isInvalidDecl()) {
1639     Out << "#pragma omp declare reduction (";
1640     if (D->getDeclName().getNameKind() == DeclarationName::CXXOperatorName) {
1641       static const char *const OperatorNames[NUM_OVERLOADED_OPERATORS] = {
1642           nullptr,
1643 #define OVERLOADED_OPERATOR(Name, Spelling, Token, Unary, Binary, MemberOnly)  \
1644           Spelling,
1645 #include "clang/Basic/OperatorKinds.def"
1646       };
1647       const char *OpName =
1648           OperatorNames[D->getDeclName().getCXXOverloadedOperator()];
1649       assert(OpName && "not an overloaded operator");
1650       Out << OpName;
1651     } else {
1652       assert(D->getDeclName().isIdentifier());
1653       D->printName(Out);
1654     }
1655     Out << " : ";
1656     D->getType().print(Out, Policy);
1657     Out << " : ";
1658     D->getCombiner()->printPretty(Out, nullptr, Policy, 0);
1659     Out << ")";
1660     if (auto *Init = D->getInitializer()) {
1661       Out << " initializer(";
1662       switch (D->getInitializerKind()) {
1663       case OMPDeclareReductionDecl::DirectInit:
1664         Out << "omp_priv(";
1665         break;
1666       case OMPDeclareReductionDecl::CopyInit:
1667         Out << "omp_priv = ";
1668         break;
1669       case OMPDeclareReductionDecl::CallInit:
1670         break;
1671       }
1672       Init->printPretty(Out, nullptr, Policy, 0);
1673       if (D->getInitializerKind() == OMPDeclareReductionDecl::DirectInit)
1674         Out << ")";
1675       Out << ")";
1676     }
1677   }
1678 }
1679 
1680 void DeclPrinter::VisitOMPDeclareMapperDecl(OMPDeclareMapperDecl *D) {
1681   if (!D->isInvalidDecl()) {
1682     Out << "#pragma omp declare mapper (";
1683     D->printName(Out);
1684     Out << " : ";
1685     D->getType().print(Out, Policy);
1686     Out << " ";
1687     Out << D->getVarName();
1688     Out << ")";
1689     if (!D->clauselist_empty()) {
1690       OMPClausePrinter Printer(Out, Policy);
1691       for (auto *C : D->clauselists()) {
1692         Out << " ";
1693         Printer.Visit(C);
1694       }
1695     }
1696   }
1697 }
1698 
1699 void DeclPrinter::VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D) {
1700   D->getInit()->printPretty(Out, nullptr, Policy, Indentation);
1701 }
1702 
1703