text: //===--- DeclPrinter.cpp - Printing implementation for Decl ASTs ----------===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  //
  // This file implements the Decl::print method, which pretty prints the
  // AST back out to C/Objective-C/C++/Objective-C++ code.
  //
  //===----------------------------------------------------------------------===//
  #include "clang/AST/ASTContext.h"
  #include "clang/AST/Attr.h"
  #include "clang/AST/Decl.h"
  #include "clang/AST/DeclCXX.h"
  #include "clang/AST/DeclObjC.h"
  #include "clang/AST/DeclTemplate.h"
  #include "clang/AST/DeclVisitor.h"
  #include "clang/AST/Expr.h"
  #include "clang/AST/ExprCXX.h"
  #include "clang/AST/PrettyPrinter.h"
  #include "clang/Basic/Module.h"
  #include "llvm/Support/raw_ostream.h"
  using namespace clang;
  
  namespace {
    class DeclPrinter : public DeclVisitor<DeclPrinter> {
      raw_ostream &Out;
      PrintingPolicy Policy;
      const ASTContext &Context;
      unsigned Indentation;
      bool PrintInstantiation;
  
      raw_ostream& Indent() { return Indent(Indentation); }
      raw_ostream& Indent(unsigned Indentation);
      void ProcessDeclGroup(SmallVectorImpl<Decl*>& Decls);
  
      void Print(AccessSpecifier AS);
      void PrintConstructorInitializers(CXXConstructorDecl *CDecl,
                                        std::string &Proto);
  
      /// Print an Objective-C method type in parentheses.
      ///
      /// \param Quals The Objective-C declaration qualifiers.
      /// \param T The type to print.
      void PrintObjCMethodType(ASTContext &Ctx, Decl::ObjCDeclQualifier Quals,
                               QualType T);
  
      void PrintObjCTypeParams(ObjCTypeParamList *Params);
  
    public:
      DeclPrinter(raw_ostream &Out, const PrintingPolicy &Policy,
                  const ASTContext &Context, unsigned Indentation = 0,
                  bool PrintInstantiation = false)
          : Out(Out), Policy(Policy), Context(Context), Indentation(Indentation),
            PrintInstantiation(PrintInstantiation) {}
  
      void VisitDeclContext(DeclContext *DC, bool Indent = true);
  
      void VisitTranslationUnitDecl(TranslationUnitDecl *D);
      void VisitTypedefDecl(TypedefDecl *D);
      void VisitTypeAliasDecl(TypeAliasDecl *D);
      void VisitEnumDecl(EnumDecl *D);
      void VisitRecordDecl(RecordDecl *D);
      void VisitEnumConstantDecl(EnumConstantDecl *D);
      void VisitEmptyDecl(EmptyDecl *D);
      void VisitFunctionDecl(FunctionDecl *D);
      void VisitFriendDecl(FriendDecl *D);
      void VisitFieldDecl(FieldDecl *D);
      void VisitVarDecl(VarDecl *D);
      void VisitLabelDecl(LabelDecl *D);
      void VisitParmVarDecl(ParmVarDecl *D);
      void VisitFileScopeAsmDecl(FileScopeAsmDecl *D);
      void VisitImportDecl(ImportDecl *D);
      void VisitStaticAssertDecl(StaticAssertDecl *D);
      void VisitNamespaceDecl(NamespaceDecl *D);
      void VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
      void VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
      void VisitCXXRecordDecl(CXXRecordDecl *D);
      void VisitLinkageSpecDecl(LinkageSpecDecl *D);
      void VisitTemplateDecl(const TemplateDecl *D);
      void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
      void VisitClassTemplateDecl(ClassTemplateDecl *D);
      void VisitClassTemplateSpecializationDecl(
                                              ClassTemplateSpecializationDecl *D);
      void VisitClassTemplatePartialSpecializationDecl(
                                       ClassTemplatePartialSpecializationDecl *D);
      void VisitObjCMethodDecl(ObjCMethodDecl *D);
      void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
      void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
      void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
      void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
      void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
      void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
      void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
      void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
      void VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
      void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
      void VisitUsingDecl(UsingDecl *D);
      void VisitUsingEnumDecl(UsingEnumDecl *D);
      void VisitUsingShadowDecl(UsingShadowDecl *D);
      void VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D);
      void VisitOMPAllocateDecl(OMPAllocateDecl *D);
      void VisitOMPRequiresDecl(OMPRequiresDecl *D);
      void VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D);
      void VisitOMPDeclareMapperDecl(OMPDeclareMapperDecl *D);
      void VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D);
      void VisitTemplateTypeParmDecl(const TemplateTypeParmDecl *TTP);
      void VisitNonTypeTemplateParmDecl(const NonTypeTemplateParmDecl *NTTP);
  
      void printTemplateParameters(const TemplateParameterList *Params,
                                   bool OmitTemplateKW = false);
      void printTemplateArguments(llvm::ArrayRef<TemplateArgument> Args,
                                  const TemplateParameterList *Params);
      void printTemplateArguments(llvm::ArrayRef<TemplateArgumentLoc> Args,
                                  const TemplateParameterList *Params);
      void prettyPrintAttributes(Decl *D);
      void prettyPrintPragmas(Decl *D);
      void printDeclType(QualType T, StringRef DeclName, bool Pack = false);
    };
  }
  
  void Decl::print(raw_ostream &Out, unsigned Indentation,
                   bool PrintInstantiation) const {
    print(Out, getASTContext().getPrintingPolicy(), Indentation, PrintInstantiation);
  }
  
  void Decl::print(raw_ostream &Out, const PrintingPolicy &Policy,
                   unsigned Indentation, bool PrintInstantiation) const {
    DeclPrinter Printer(Out, Policy, getASTContext(), Indentation,
                        PrintInstantiation);
    Printer.Visit(const_cast<Decl*>(this));
  }
  
  void TemplateParameterList::print(raw_ostream &Out, const ASTContext &Context,
                                    bool OmitTemplateKW) const {
    print(Out, Context, Context.getPrintingPolicy(), OmitTemplateKW);
  }
  
  void TemplateParameterList::print(raw_ostream &Out, const ASTContext &Context,
                                    const PrintingPolicy &Policy,
                                    bool OmitTemplateKW) const {
    DeclPrinter Printer(Out, Policy, Context);
    Printer.printTemplateParameters(this, OmitTemplateKW);
  }
  
  static QualType GetBaseType(QualType T) {
    // FIXME: This should be on the Type class!
    QualType BaseType = T;
    while (!BaseType->isSpecifierType()) {
      if (const PointerType *PTy = BaseType->getAs<PointerType>())
        BaseType = PTy->getPointeeType();
      else if (const ObjCObjectPointerType *OPT =
                   BaseType->getAs<ObjCObjectPointerType>())
        BaseType = OPT->getPointeeType();
      else if (const BlockPointerType *BPy = BaseType->getAs<BlockPointerType>())
        BaseType = BPy->getPointeeType();
      else if (const ArrayType *ATy = dyn_cast<ArrayType>(BaseType))
        BaseType = ATy->getElementType();
      else if (const FunctionType *FTy = BaseType->getAs<FunctionType>())
        BaseType = FTy->getReturnType();
      else if (const VectorType *VTy = BaseType->getAs<VectorType>())
        BaseType = VTy->getElementType();
      else if (const ReferenceType *RTy = BaseType->getAs<ReferenceType>())
        BaseType = RTy->getPointeeType();
      else if (const AutoType *ATy = BaseType->getAs<AutoType>())
        BaseType = ATy->getDeducedType();
      else if (const ParenType *PTy = BaseType->getAs<ParenType>())
        BaseType = PTy->desugar();
      else
        // This must be a syntax error.
        break;
    }
    return BaseType;
  }
  
  static QualType getDeclType(Decl* D) {
    if (TypedefNameDecl* TDD = dyn_cast<TypedefNameDecl>(D))
      return TDD->getUnderlyingType();
    if (ValueDecl* VD = dyn_cast<ValueDecl>(D))
      return VD->getType();
    return QualType();
  }
  
  void Decl::printGroup(Decl** Begin, unsigned NumDecls,
                        raw_ostream &Out, const PrintingPolicy &Policy,
                        unsigned Indentation) {
    if (NumDecls == 1) {
      (*Begin)->print(Out, Policy, Indentation);
      return;
    }
  
    Decl** End = Begin + NumDecls;
    TagDecl* TD = dyn_cast<TagDecl>(*Begin);
    if (TD)
      ++Begin;
  
    PrintingPolicy SubPolicy(Policy);
  
    bool isFirst = true;
    for ( ; Begin != End; ++Begin) {
      if (isFirst) {
        if(TD)
          SubPolicy.IncludeTagDefinition = true;
        SubPolicy.SuppressSpecifiers = false;
        isFirst = false;
      } else {
        if (!isFirst) Out << ", ";
        SubPolicy.IncludeTagDefinition = false;
        SubPolicy.SuppressSpecifiers = true;
      }
  
      (*Begin)->print(Out, SubPolicy, Indentation);
    }
  }
  
  LLVM_DUMP_METHOD void DeclContext::dumpDeclContext() const {
    // Get the translation unit
    const DeclContext *DC = this;
    while (!DC->isTranslationUnit())
      DC = DC->getParent();
  
    ASTContext &Ctx = cast<TranslationUnitDecl>(DC)->getASTContext();
    DeclPrinter Printer(llvm::errs(), Ctx.getPrintingPolicy(), Ctx, 0);
    Printer.VisitDeclContext(const_cast<DeclContext *>(this), /*Indent=*/false);
  }
  
  raw_ostream& DeclPrinter::Indent(unsigned Indentation) {
    for (unsigned i = 0; i != Indentation; ++i)
      Out << "  ";
    return Out;
  }
  
  void DeclPrinter::prettyPrintAttributes(Decl *D) {
    if (Policy.PolishForDeclaration)
      return;
  
    if (D->hasAttrs()) {
      AttrVec &Attrs = D->getAttrs();
      for (auto *A : Attrs) {
        if (A->isInherited() || A->isImplicit())
          continue;
        switch (A->getKind()) {
  #define ATTR(X)
  #define PRAGMA_SPELLING_ATTR(X) case attr::X:
  #include "clang/Basic/AttrList.inc"
          break;
        default:
          A->printPretty(Out, Policy);
          break;
        }
      }
    }
  }
  
  void DeclPrinter::prettyPrintPragmas(Decl *D) {
    if (Policy.PolishForDeclaration)
      return;
  
    if (D->hasAttrs()) {
      AttrVec &Attrs = D->getAttrs();
      for (auto *A : Attrs) {
        switch (A->getKind()) {
  #define ATTR(X)
  #define PRAGMA_SPELLING_ATTR(X) case attr::X:
  #include "clang/Basic/AttrList.inc"
          A->printPretty(Out, Policy);
          Indent();
          break;
        default:
          break;
        }
      }
    }
  }
  
  void DeclPrinter::printDeclType(QualType T, StringRef DeclName, bool Pack) {
    // Normally, a PackExpansionType is written as T[3]... (for instance, as a
    // template argument), but if it is the type of a declaration, the ellipsis
    // is placed before the name being declared.
    if (auto *PET = T->getAs<PackExpansionType>()) {
      Pack = true;
      T = PET->getPattern();
    }
    T.print(Out, Policy, (Pack ? "..." : "") + DeclName, Indentation);
  }
  
  void DeclPrinter::ProcessDeclGroup(SmallVectorImpl<Decl*>& Decls) {
    this->Indent();
    Decl::printGroup(Decls.data(), Decls.size(), Out, Policy, Indentation);
    Out << ";\n";
    Decls.clear();
  
  }
  
  void DeclPrinter::Print(AccessSpecifier AS) {
    const auto AccessSpelling = getAccessSpelling(AS);
    if (AccessSpelling.empty())
      llvm_unreachable("No access specifier!");
    Out << AccessSpelling;
  }
  
  void DeclPrinter::PrintConstructorInitializers(CXXConstructorDecl *CDecl,
                                                 std::string &Proto) {
    bool HasInitializerList = false;
    for (const auto *BMInitializer : CDecl->inits()) {
      if (BMInitializer->isInClassMemberInitializer())
        continue;
  
      if (!HasInitializerList) {
        Proto += " : ";
        Out << Proto;
        Proto.clear();
        HasInitializerList = true;
      } else
        Out << ", ";
  
      if (BMInitializer->isAnyMemberInitializer()) {
        FieldDecl *FD = BMInitializer->getAnyMember();
        Out << *FD;
      } else {
        Out << QualType(BMInitializer->getBaseClass(), 0).getAsString(Policy);
      }
  
      Out << "(";
      if (!BMInitializer->getInit()) {
        // Nothing to print
      } else {
        Expr *Init = BMInitializer->getInit();
        if (ExprWithCleanups *Tmp = dyn_cast<ExprWithCleanups>(Init))
          Init = Tmp->getSubExpr();
  
        Init = Init->IgnoreParens();
  
        Expr *SimpleInit = nullptr;
        Expr **Args = nullptr;
        unsigned NumArgs = 0;
        if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
          Args = ParenList->getExprs();
          NumArgs = ParenList->getNumExprs();
        } else if (CXXConstructExpr *Construct =
                       dyn_cast<CXXConstructExpr>(Init)) {
          Args = Construct->getArgs();
          NumArgs = Construct->getNumArgs();
        } else
          SimpleInit = Init;
  
        if (SimpleInit)
          SimpleInit->printPretty(Out, nullptr, Policy, Indentation, "\n",
                                  &Context);
        else {
          for (unsigned I = 0; I != NumArgs; ++I) {
            assert(Args[I] != nullptr && "Expected non-null Expr");
            if (isa<CXXDefaultArgExpr>(Args[I]))
              break;
  
            if (I)
              Out << ", ";
            Args[I]->printPretty(Out, nullptr, Policy, Indentation, "\n",
                                 &Context);
          }
        }
      }
      Out << ")";
      if (BMInitializer->isPackExpansion())
        Out << "...";
    }
  }
  
  //----------------------------------------------------------------------------
  // Common C declarations
  //----------------------------------------------------------------------------
  
  void DeclPrinter::VisitDeclContext(DeclContext *DC, bool Indent) {
    if (Policy.TerseOutput)
      return;
  
    if (Indent)
      Indentation += Policy.Indentation;
  
    SmallVector<Decl*, 2> Decls;
    for (DeclContext::decl_iterator D = DC->decls_begin(), DEnd = DC->decls_end();
         D != DEnd; ++D) {
  
      // Don't print ObjCIvarDecls, as they are printed when visiting the
      // containing ObjCInterfaceDecl.
      if (isa<ObjCIvarDecl>(*D))
        continue;
  
      // Skip over implicit declarations in pretty-printing mode.
      if (D->isImplicit())
        continue;
  
      // Don't print implicit specializations, as they are printed when visiting
      // corresponding templates.
      if (auto FD = dyn_cast<FunctionDecl>(*D))
        if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation &&
            !isa<ClassTemplateSpecializationDecl>(DC))
          continue;
  
      // The next bits of code handle stuff like "struct {int x;} a,b"; we're
      // forced to merge the declarations because there's no other way to
      // refer to the struct in question.  When that struct is named instead, we
      // also need to merge to avoid splitting off a stand-alone struct
      // declaration that produces the warning ext_no_declarators in some
      // contexts.
      //
      // This limited merging is safe without a bunch of other checks because it
      // only merges declarations directly referring to the tag, not typedefs.
      //
      // Check whether the current declaration should be grouped with a previous
      // non-free-standing tag declaration.
      QualType CurDeclType = getDeclType(*D);
      if (!Decls.empty() && !CurDeclType.isNull()) {
        QualType BaseType = GetBaseType(CurDeclType);
        if (!BaseType.isNull() && isa<ElaboratedType>(BaseType) &&
            cast<ElaboratedType>(BaseType)->getOwnedTagDecl() == Decls[0]) {
          Decls.push_back(*D);
          continue;
        }
      }
  
      // If we have a merged group waiting to be handled, handle it now.
      if (!Decls.empty())
        ProcessDeclGroup(Decls);
  
      // If the current declaration is not a free standing declaration, save it
      // so we can merge it with the subsequent declaration(s) using it.
      if (isa<TagDecl>(*D) && !cast<TagDecl>(*D)->isFreeStanding()) {
        Decls.push_back(*D);
        continue;
      }
  
      if (isa<AccessSpecDecl>(*D)) {
        Indentation -= Policy.Indentation;
        this->Indent();
        Print(D->getAccess());
        Out << ":\n";
        Indentation += Policy.Indentation;
        continue;
      }
  
      this->Indent();
      Visit(*D);
  
      // FIXME: Need to be able to tell the DeclPrinter when
      const char *Terminator = nullptr;
      if (isa<OMPThreadPrivateDecl>(*D) || isa<OMPDeclareReductionDecl>(*D) ||
          isa<OMPDeclareMapperDecl>(*D) || isa<OMPRequiresDecl>(*D) ||
          isa<OMPAllocateDecl>(*D))
        Terminator = nullptr;
      else if (isa<ObjCMethodDecl>(*D) && cast<ObjCMethodDecl>(*D)->hasBody())
        Terminator = nullptr;
      else if (auto FD = dyn_cast<FunctionDecl>(*D)) {
        if (FD->isThisDeclarationADefinition())
          Terminator = nullptr;
        else
          Terminator = ";";
      } else if (auto TD = dyn_cast<FunctionTemplateDecl>(*D)) {
        if (TD->getTemplatedDecl()->isThisDeclarationADefinition())
          Terminator = nullptr;
        else
          Terminator = ";";
      } else if (isa<NamespaceDecl>(*D) || isa<LinkageSpecDecl>(*D) ||
               isa<ObjCImplementationDecl>(*D) ||
               isa<ObjCInterfaceDecl>(*D) ||
               isa<ObjCProtocolDecl>(*D) ||
               isa<ObjCCategoryImplDecl>(*D) ||
               isa<ObjCCategoryDecl>(*D))
        Terminator = nullptr;
      else if (isa<EnumConstantDecl>(*D)) {
        DeclContext::decl_iterator Next = D;
        ++Next;
        if (Next != DEnd)
          Terminator = ",";
      } else
        Terminator = ";";
  
      if (Terminator)
        Out << Terminator;
      if (!Policy.TerseOutput &&
          ((isa<FunctionDecl>(*D) &&
            cast<FunctionDecl>(*D)->doesThisDeclarationHaveABody()) ||
           (isa<FunctionTemplateDecl>(*D) &&
            cast<FunctionTemplateDecl>(*D)->getTemplatedDecl()->doesThisDeclarationHaveABody())))
        ; // StmtPrinter already added '\n' after CompoundStmt.
      else
        Out << "\n";
  
      // Declare target attribute is special one, natural spelling for the pragma
      // assumes "ending" construct so print it here.
      if (D->hasAttr<OMPDeclareTargetDeclAttr>())
        Out << "#pragma omp end declare target\n";
    }
  
    if (!Decls.empty())
      ProcessDeclGroup(Decls);
  
    if (Indent)
      Indentation -= Policy.Indentation;
  }
  
  void DeclPrinter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
    VisitDeclContext(D, false);
  }
  
  void DeclPrinter::VisitTypedefDecl(TypedefDecl *D) {
    if (!Policy.SuppressSpecifiers) {
      Out << "typedef ";
  
      if (D->isModulePrivate())
        Out << "__module_private__ ";
    }
    QualType Ty = D->getTypeSourceInfo()->getType();
    Ty.print(Out, Policy, D->getName(), Indentation);
    prettyPrintAttributes(D);
  }
  
  void DeclPrinter::VisitTypeAliasDecl(TypeAliasDecl *D) {
    Out << "using " << *D;
    prettyPrintAttributes(D);
    Out << " = " << D->getTypeSourceInfo()->getType().getAsString(Policy);
  }
  
  void DeclPrinter::VisitEnumDecl(EnumDecl *D) {
    if (!Policy.SuppressSpecifiers && D->isModulePrivate())
      Out << "__module_private__ ";
    Out << "enum";
    if (D->isScoped()) {
      if (D->isScopedUsingClassTag())
        Out << " class";
      else
        Out << " struct";
    }
  
    prettyPrintAttributes(D);
  
    if (D->getDeclName())
      Out << ' ' << D->getDeclName();
  
    if (Policy.SuppressDefinition)
      return;
  
    if (D->isFixed())
      Out << " : " << D->getIntegerType().stream(Policy);
  
    if (D->isCompleteDefinition()) {
      Out << " {\n";
      VisitDeclContext(D);
      Indent() << "}";
    }
  }
  
  void DeclPrinter::VisitRecordDecl(RecordDecl *D) {
    if (!Policy.SuppressSpecifiers && D->isModulePrivate())
      Out << "__module_private__ ";
    Out << D->getKindName();
  
    prettyPrintAttributes(D);
  
    if (D->getIdentifier())
      Out << ' ' << *D;
  
    if (Policy.SuppressDefinition)
      return;
  
    if (D->isCompleteDefinition()) {
      Out << " {\n";
      VisitDeclContext(D);
      Indent() << "}";
    }
  }
  
  void DeclPrinter::VisitEnumConstantDecl(EnumConstantDecl *D) {
    Out << *D;
    prettyPrintAttributes(D);
    if (Expr *Init = D->getInitExpr()) {
      Out << " = ";
      Init->printPretty(Out, nullptr, Policy, Indentation, "\n", &Context);
    }
  }
  
  static void printExplicitSpecifier(ExplicitSpecifier ES, llvm::raw_ostream &Out,
                                     PrintingPolicy &Policy, unsigned Indentation,
                                     const ASTContext &Context) {
    std::string Proto = "explicit";
    llvm::raw_string_ostream EOut(Proto);
    if (ES.getExpr()) {
      EOut << "(";
      ES.getExpr()->printPretty(EOut, nullptr, Policy, Indentation, "\n",
                                &Context);
      EOut << ")";
    }
    EOut << " ";
    EOut.flush();
    Out << Proto;
  }
  
  void DeclPrinter::VisitFunctionDecl(FunctionDecl *D) {
    if (!D->getDescribedFunctionTemplate() &&
        !D->isFunctionTemplateSpecialization())
      prettyPrintPragmas(D);
  
    if (D->isFunctionTemplateSpecialization())
      Out << "template<> ";
    else if (!D->getDescribedFunctionTemplate()) {
      for (unsigned I = 0, NumTemplateParams = D->getNumTemplateParameterLists();
           I < NumTemplateParams; ++I)
        printTemplateParameters(D->getTemplateParameterList(I));
    }
  
    CXXConstructorDecl *CDecl = dyn_cast<CXXConstructorDecl>(D);
    CXXConversionDecl *ConversionDecl = dyn_cast<CXXConversionDecl>(D);
    CXXDeductionGuideDecl *GuideDecl = dyn_cast<CXXDeductionGuideDecl>(D);
    if (!Policy.SuppressSpecifiers) {
      switch (D->getStorageClass()) {
      case SC_None: break;
      case SC_Extern: Out << "extern "; break;
      case SC_Static: Out << "static "; break;
      case SC_PrivateExtern: Out << "__private_extern__ "; break;
      case SC_Auto: case SC_Register:
        llvm_unreachable("invalid for functions");
      }
  
      if (D->isInlineSpecified())  Out << "inline ";
      if (D->isVirtualAsWritten()) Out << "virtual ";
      if (D->isModulePrivate())    Out << "__module_private__ ";
      if (D->isConstexprSpecified() && !D->isExplicitlyDefaulted())
        Out << "constexpr ";
      if (D->isConsteval())        Out << "consteval ";
      ExplicitSpecifier ExplicitSpec = ExplicitSpecifier::getFromDecl(D);
      if (ExplicitSpec.isSpecified())
        printExplicitSpecifier(ExplicitSpec, Out, Policy, Indentation, Context);
    }
  
    PrintingPolicy SubPolicy(Policy);
    SubPolicy.SuppressSpecifiers = false;
    std::string Proto;
  
    if (Policy.FullyQualifiedName) {
      Proto += D->getQualifiedNameAsString();
    } else {
      llvm::raw_string_ostream OS(Proto);
      if (!Policy.SuppressScope) {
        if (const NestedNameSpecifier *NS = D->getQualifier()) {
          NS->print(OS, Policy);
        }
      }
      D->getNameInfo().printName(OS, Policy);
    }
  
    if (GuideDecl)
      Proto = GuideDecl->getDeducedTemplate()->getDeclName().getAsString();
    if (D->isFunctionTemplateSpecialization()) {
      llvm::raw_string_ostream POut(Proto);
      DeclPrinter TArgPrinter(POut, SubPolicy, Context, Indentation);
      const auto *TArgAsWritten = D->getTemplateSpecializationArgsAsWritten();
      if (TArgAsWritten && !Policy.PrintCanonicalTypes)
        TArgPrinter.printTemplateArguments(TArgAsWritten->arguments(), nullptr);
      else if (const TemplateArgumentList *TArgs =
                   D->getTemplateSpecializationArgs())
        TArgPrinter.printTemplateArguments(TArgs->asArray(), nullptr);
    }
  
    QualType Ty = D->getType();
    while (const ParenType *PT = dyn_cast<ParenType>(Ty)) {
      Proto = '(' + Proto + ')';
      Ty = PT->getInnerType();
    }
  
    if (const FunctionType *AFT = Ty->getAs<FunctionType>()) {
      const FunctionProtoType *FT = nullptr;
      if (D->hasWrittenPrototype())
        FT = dyn_cast<FunctionProtoType>(AFT);
  
      Proto += "(";
      if (FT) {
        llvm::raw_string_ostream POut(Proto);
        DeclPrinter ParamPrinter(POut, SubPolicy, Context, Indentation);
        for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
          if (i) POut << ", ";
          ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
        }
  
        if (FT->isVariadic()) {
          if (D->getNumParams()) POut << ", ";
          POut << "...";
        }
      } else if (D->doesThisDeclarationHaveABody() && !D->hasPrototype()) {
        for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
          if (i)
            Proto += ", ";
          Proto += D->getParamDecl(i)->getNameAsString();
        }
      }
  
      Proto += ")";
  
      if (FT) {
        if (FT->isConst())
          Proto += " const";
        if (FT->isVolatile())
          Proto += " volatile";
        if (FT->isRestrict())
          Proto += " restrict";
  
        switch (FT->getRefQualifier()) {
        case RQ_None:
          break;
        case RQ_LValue:
          Proto += " &";
          break;
        case RQ_RValue:
          Proto += " &&";
          break;
        }
      }
  
      if (FT && FT->hasDynamicExceptionSpec()) {
        Proto += " throw(";
        if (FT->getExceptionSpecType() == EST_MSAny)
          Proto += "...";
        else
          for (unsigned I = 0, N = FT->getNumExceptions(); I != N; ++I) {
            if (I)
              Proto += ", ";
  
            Proto += FT->getExceptionType(I).getAsString(SubPolicy);
          }
        Proto += ")";
      } else if (FT && isNoexceptExceptionSpec(FT->getExceptionSpecType())) {
        Proto += " noexcept";
        if (isComputedNoexcept(FT->getExceptionSpecType())) {
          Proto += "(";
          llvm::raw_string_ostream EOut(Proto);
          FT->getNoexceptExpr()->printPretty(EOut, nullptr, SubPolicy,
                                             Indentation, "\n", &Context);
          EOut.flush();
          Proto += ")";
        }
      }
  
      if (CDecl) {
        if (!Policy.TerseOutput)
          PrintConstructorInitializers(CDecl, Proto);
      } else if (!ConversionDecl && !isa<CXXDestructorDecl>(D)) {
        if (FT && FT->hasTrailingReturn()) {
          if (!GuideDecl)
            Out << "auto ";
          Out << Proto << " -> ";
          Proto.clear();
        }
        AFT->getReturnType().print(Out, Policy, Proto);
        Proto.clear();
      }
      Out << Proto;
  
      if (Expr *TrailingRequiresClause = D->getTrailingRequiresClause()) {
        Out << " requires ";
        TrailingRequiresClause->printPretty(Out, nullptr, SubPolicy, Indentation,
                                            "\n", &Context);
      }
    } else {
      Ty.print(Out, Policy, Proto);
    }
  
    prettyPrintAttributes(D);
  
    if (D->isPure())
      Out << " = 0";
    else if (D->isDeletedAsWritten())
      Out << " = delete";
    else if (D->isExplicitlyDefaulted())
      Out << " = default";
    else if (D->doesThisDeclarationHaveABody() && !Policy.SuppressDefinition) {
      if (!Policy.TerseOutput) {
        if (!D->hasPrototype() && D->getNumParams()) {
          // This is a K&R function definition, so we need to print the
          // parameters.
          Out << '\n';
          DeclPrinter ParamPrinter(Out, SubPolicy, Context, Indentation);
          Indentation += Policy.Indentation;
          for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
            Indent();
            ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
            Out << ";\n";
          }
          Indentation -= Policy.Indentation;
        }
  
        if (D->getBody())
          D->getBody()->printPrettyControlled(Out, nullptr, SubPolicy, Indentation, "\n",
                                    &Context);
      } else {
        if (!Policy.TerseOutput && isa<CXXConstructorDecl>(*D))
          Out << " {}";
      }
    }
  }
  
  void DeclPrinter::VisitFriendDecl(FriendDecl *D) {
    if (TypeSourceInfo *TSI = D->getFriendType()) {
      unsigned NumTPLists = D->getFriendTypeNumTemplateParameterLists();
      for (unsigned i = 0; i < NumTPLists; ++i)
        printTemplateParameters(D->getFriendTypeTemplateParameterList(i));
      Out << "friend ";
      Out << " " << TSI->getType().getAsString(Policy);
    }
    else if (FunctionDecl *FD =
        dyn_cast<FunctionDecl>(D->getFriendDecl())) {
      Out << "friend ";
      VisitFunctionDecl(FD);
    }
    else if (FunctionTemplateDecl *FTD =
             dyn_cast<FunctionTemplateDecl>(D->getFriendDecl())) {
      Out << "friend ";
      VisitFunctionTemplateDecl(FTD);
    }
    else if (ClassTemplateDecl *CTD =
             dyn_cast<ClassTemplateDecl>(D->getFriendDecl())) {
      Out << "friend ";
      VisitRedeclarableTemplateDecl(CTD);
    }
  }
  
  void DeclPrinter::VisitFieldDecl(FieldDecl *D) {
    // FIXME: add printing of pragma attributes if required.
    if (!Policy.SuppressSpecifiers && D->isMutable())
      Out << "mutable ";
    if (!Policy.SuppressSpecifiers && D->isModulePrivate())
      Out << "__module_private__ ";
  
    Out << D->getASTContext().getUnqualifiedObjCPointerType(D->getType()).
           stream(Policy, D->getName(), Indentation);
  
    if (D->isBitField()) {
      Out << " : ";
      D->getBitWidth()->printPretty(Out, nullptr, Policy, Indentation, "\n",
                                    &Context);
    }
  
    Expr *Init = D->getInClassInitializer();
    if (!Policy.SuppressInitializers && Init) {
      if (D->getInClassInitStyle() == ICIS_ListInit)
        Out << " ";
      else
        Out << " = ";
      Init->printPretty(Out, nullptr, Policy, Indentation, "\n", &Context);
    }
    prettyPrintAttributes(D);
  }
  
  void DeclPrinter::VisitLabelDecl(LabelDecl *D) {
    Out << *D << ":";
  }
  
  void DeclPrinter::VisitVarDecl(VarDecl *D) {
    prettyPrintPragmas(D);
  
    QualType T = D->getTypeSourceInfo()
      ? D->getTypeSourceInfo()->getType()
      : D->getASTContext().getUnqualifiedObjCPointerType(D->getType());
  
    if (!Policy.SuppressSpecifiers) {
      StorageClass SC = D->getStorageClass();
      if (SC != SC_None)
        Out << VarDecl::getStorageClassSpecifierString(SC) << " ";
  
      switch (D->getTSCSpec()) {
      case TSCS_unspecified:
        break;
      case TSCS___thread:
        Out << "__thread ";
        break;
      case TSCS__Thread_local:
        Out << "_Thread_local ";
        break;
      case TSCS_thread_local:
        Out << "thread_local ";
        break;
      }
  
      if (D->isModulePrivate())
        Out << "__module_private__ ";
  
      if (D->isConstexpr()) {
        Out << "constexpr ";
        T.removeLocalConst();
      }
    }
  
    printDeclType(T, (isa<ParmVarDecl>(D) && Policy.CleanUglifiedParameters &&
                      D->getIdentifier())
                         ? D->getIdentifier()->deuglifiedName()
                         : D->getName());
    Expr *Init = D->getInit();
    if (!Policy.SuppressInitializers && Init) {
      bool ImplicitInit = false;
      if (CXXConstructExpr *Construct =
              dyn_cast<CXXConstructExpr>(Init->IgnoreImplicit())) {
        if (D->getInitStyle() == VarDecl::CallInit &&
            !Construct->isListInitialization()) {
          ImplicitInit = Construct->getNumArgs() == 0 ||
            Construct->getArg(0)->isDefaultArgument();
        }
      }
      if (!ImplicitInit) {
        if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
          Out << "(";
        else if (D->getInitStyle() == VarDecl::CInit) {
          Out << " = ";
        }
        PrintingPolicy SubPolicy(Policy);
        SubPolicy.SuppressSpecifiers = false;
        SubPolicy.IncludeTagDefinition = false;
        Init->printPretty(Out, nullptr, SubPolicy, Indentation, "\n", &Context);
        if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
          Out << ")";
      }
    }
    prettyPrintAttributes(D);
  }
  
  void DeclPrinter::VisitParmVarDecl(ParmVarDecl *D) {
    VisitVarDecl(D);
  }
  
  void DeclPrinter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
    Out << "__asm (";
    D->getAsmString()->printPretty(Out, nullptr, Policy, Indentation, "\n",
                                   &Context);
    Out << ")";
  }
  
  void DeclPrinter::VisitImportDecl(ImportDecl *D) {
    Out << "@import " << D->getImportedModule()->getFullModuleName()
        << ";\n";
  }
  
  void DeclPrinter::VisitStaticAssertDecl(StaticAssertDecl *D) {
    Out << "static_assert(";
    D->getAssertExpr()->printPretty(Out, nullptr, Policy, Indentation, "\n",
                                    &Context);
    if (StringLiteral *SL = D->getMessage()) {
      Out << ", ";
      SL->printPretty(Out, nullptr, Policy, Indentation, "\n", &Context);
    }
    Out << ")";
  }
  
  //----------------------------------------------------------------------------
  // C++ declarations
  //----------------------------------------------------------------------------
  void DeclPrinter::VisitNamespaceDecl(NamespaceDecl *D) {
    if (D->isInline())
      Out << "inline ";
  
    Out << "namespace ";
    if (D->getDeclName())
      Out << D->getDeclName() << ' ';
    Out << "{\n";
  
    VisitDeclContext(D);
    Indent() << "}";
  }
  
  void DeclPrinter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
    Out << "using namespace ";
    if (D->getQualifier())
      D->getQualifier()->print(Out, Policy);
    Out << *D->getNominatedNamespaceAsWritten();
  }
  
  void DeclPrinter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
    Out << "namespace " << *D << " = ";
    if (D->getQualifier())
      D->getQualifier()->print(Out, Policy);
    Out << *D->getAliasedNamespace();
  }
  
  void DeclPrinter::VisitEmptyDecl(EmptyDecl *D) {
    prettyPrintAttributes(D);
  }
  
  void DeclPrinter::VisitCXXRecordDecl(CXXRecordDecl *D) {
    // FIXME: add printing of pragma attributes if required.
    if (!Policy.SuppressSpecifiers && D->isModulePrivate())
      Out << "__module_private__ ";
    Out << D->getKindName();
  
    prettyPrintAttributes(D);
  
    if (D->getIdentifier()) {
      Out << ' ' << *D;
  
      if (auto S = dyn_cast<ClassTemplateSpecializationDecl>(D)) {
        ArrayRef<TemplateArgument> Args = S->getTemplateArgs().asArray();
        if (!Policy.PrintCanonicalTypes)
          if (const auto* TSI = S->getTypeAsWritten())
            if (const auto *TST =
                    dyn_cast<TemplateSpecializationType>(TSI->getType()))
              Args = TST->template_arguments();
        printTemplateArguments(
            Args, S->getSpecializedTemplate()->getTemplateParameters());
      }
    }
  
    if (D->isCompleteDefinition() && !Policy.SuppressDefinition) {
      // Print the base classes
      if (D->getNumBases()) {
        Out << " : ";
        for (CXXRecordDecl::base_class_iterator Base = D->bases_begin(),
               BaseEnd = D->bases_end(); Base != BaseEnd; ++Base) {
          if (Base != D->bases_begin())
            Out << ", ";
  
          if (Base->isVirtual())
            Out << "virtual ";
  
          AccessSpecifier AS = Base->getAccessSpecifierAsWritten();
          if (AS != AS_none) {
            Print(AS);
            Out << " ";
          }
          Out << Base->getType().getAsString(Policy);
  
          if (Base->isPackExpansion())
            Out << "...";
        }
      }
  
      // Print the class definition
      // FIXME: Doesn't print access specifiers, e.g., "public:"
      if (Policy.TerseOutput) {
        Out << " {}";
      } else {
        Out << " {\n";
        VisitDeclContext(D);
        Indent() << "}";
      }
    }
  }
  
  void DeclPrinter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
    const char *l;
    if (D->getLanguage() == LinkageSpecDecl::lang_c)
      l = "C";
    else {
      assert(D->getLanguage() == LinkageSpecDecl::lang_cxx &&
             "unknown language in linkage specification");
      l = "C++";
    }
  
    Out << "extern \"" << l << "\" ";
    if (D->hasBraces()) {
      Out << "{\n";
      VisitDeclContext(D);
      Indent() << "}";
    } else
      Visit(*D->decls_begin());
  }
  
  void DeclPrinter::printTemplateParameters(const TemplateParameterList *Params,
                                            bool OmitTemplateKW) {
    assert(Params);
  
    if (!OmitTemplateKW)
      Out << "template ";
    Out << '<';
  
    bool NeedComma = false;
    for (const Decl *Param : *Params) {
      if (Param->isImplicit())
        continue;
  
      if (NeedComma)
        Out << ", ";
      else
        NeedComma = true;
  
      if (const auto *TTP = dyn_cast<TemplateTypeParmDecl>(Param)) {
        VisitTemplateTypeParmDecl(TTP);
      } else if (auto NTTP = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
        VisitNonTypeTemplateParmDecl(NTTP);
      } else if (auto TTPD = dyn_cast<TemplateTemplateParmDecl>(Param)) {
        VisitTemplateDecl(TTPD);
        // FIXME: print the default argument, if present.
      }
    }
  
    Out << '>';
    if (!OmitTemplateKW)
      Out << ' ';
  }
  
  void DeclPrinter::printTemplateArguments(ArrayRef<TemplateArgument> Args,
                                           const TemplateParameterList *Params) {
    Out << "<";
    for (size_t I = 0, E = Args.size(); I < E; ++I) {
      if (I)
        Out << ", ";
      if (!Params)
        Args[I].print(Policy, Out, /*IncludeType*/ true);
      else
        Args[I].print(Policy, Out,
                      TemplateParameterList::shouldIncludeTypeForArgument(
                          Policy, Params, I));
    }
    Out << ">";
  }
  
  void DeclPrinter::printTemplateArguments(ArrayRef<TemplateArgumentLoc> Args,
                                           const TemplateParameterList *Params) {
    Out << "<";
    for (size_t I = 0, E = Args.size(); I < E; ++I) {
      if (I)
        Out << ", ";
      if (!Params)
        Args[I].getArgument().print(Policy, Out, /*IncludeType*/ true);
      else
        Args[I].getArgument().print(
            Policy, Out,
            TemplateParameterList::shouldIncludeTypeForArgument(Policy, Params,
                                                                I));
    }
    Out << ">";
  }
  
  void DeclPrinter::VisitTemplateDecl(const TemplateDecl *D) {
    printTemplateParameters(D->getTemplateParameters());
  
    if (const TemplateTemplateParmDecl *TTP =
          dyn_cast<TemplateTemplateParmDecl>(D)) {
      Out << "class";
  
      if (TTP->isParameterPack())
        Out << " ...";
      else if (TTP->getDeclName())
        Out << ' ';
  
      if (TTP->getDeclName()) {
        if (Policy.CleanUglifiedParameters && TTP->getIdentifier())
          Out << TTP->getIdentifier()->deuglifiedName();
        else
          Out << TTP->getDeclName();
      }
    } else if (auto *TD = D->getTemplatedDecl())
      Visit(TD);
    else if (const auto *Concept = dyn_cast<ConceptDecl>(D)) {
      Out << "concept " << Concept->getName() << " = " ;
      Concept->getConstraintExpr()->printPretty(Out, nullptr, Policy, Indentation,
                                                "\n", &Context);
    }
  }
  
  void DeclPrinter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
    prettyPrintPragmas(D->getTemplatedDecl());
    // Print any leading template parameter lists.
    if (const FunctionDecl *FD = D->getTemplatedDecl()) {
      for (unsigned I = 0, NumTemplateParams = FD->getNumTemplateParameterLists();
           I < NumTemplateParams; ++I)
        printTemplateParameters(FD->getTemplateParameterList(I));
    }
    VisitRedeclarableTemplateDecl(D);
    // Declare target attribute is special one, natural spelling for the pragma
    // assumes "ending" construct so print it here.
    if (D->getTemplatedDecl()->hasAttr<OMPDeclareTargetDeclAttr>())
      Out << "#pragma omp end declare target\n";
  
    // Never print "instantiations" for deduction guides (they don't really
    // have them).
    if (PrintInstantiation &&
        !isa<CXXDeductionGuideDecl>(D->getTemplatedDecl())) {
      FunctionDecl *PrevDecl = D->getTemplatedDecl();
      const FunctionDecl *Def;
      if (PrevDecl->isDefined(Def) && Def != PrevDecl)
        return;
      for (auto *I : D->specializations())
        if (I->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) {
          if (!PrevDecl->isThisDeclarationADefinition())
            Out << ";\n";
          Indent();
          prettyPrintPragmas(I);
          Visit(I);
        }
    }
  }
  
  void DeclPrinter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
    VisitRedeclarableTemplateDecl(D);
  
    if (PrintInstantiation) {
      for (auto *I : D->specializations())
        if (I->getSpecializationKind() == TSK_ImplicitInstantiation) {
          if (D->isThisDeclarationADefinition())
            Out << ";";
          Out << "\n";
          Indent();
          Visit(I);
        }
    }
  }
  
  void DeclPrinter::VisitClassTemplateSpecializationDecl(
                                             ClassTemplateSpecializationDecl *D) {
    Out << "template<> ";
    VisitCXXRecordDecl(D);
  }
  
  void DeclPrinter::VisitClassTemplatePartialSpecializationDecl(
                                      ClassTemplatePartialSpecializationDecl *D) {
    printTemplateParameters(D->getTemplateParameters());
    VisitCXXRecordDecl(D);
  }
  
  //----------------------------------------------------------------------------
  // Objective-C declarations
  //----------------------------------------------------------------------------
  
  void DeclPrinter::PrintObjCMethodType(ASTContext &Ctx,
                                        Decl::ObjCDeclQualifier Quals,
                                        QualType T) {
    Out << '(';
    if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_In)
      Out << "in ";
    if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Inout)
      Out << "inout ";
    if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Out)
      Out << "out ";
    if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Bycopy)
      Out << "bycopy ";
    if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Byref)
      Out << "byref ";
    if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Oneway)
      Out << "oneway ";
    if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_CSNullability) {
      if (auto nullability = AttributedType::stripOuterNullability(T))
        Out << getNullabilitySpelling(*nullability, true) << ' ';
    }
  
    Out << Ctx.getUnqualifiedObjCPointerType(T).getAsString(Policy);
    Out << ')';
  }
  
  void DeclPrinter::PrintObjCTypeParams(ObjCTypeParamList *Params) {
    Out << "<";
    unsigned First = true;
    for (auto *Param : *Params) {
      if (First) {
        First = false;
      } else {
        Out << ", ";
      }
  
      switch (Param->getVariance()) {
      case ObjCTypeParamVariance::Invariant:
        break;
  
      case ObjCTypeParamVariance::Covariant:
        Out << "__covariant ";
        break;
  
      case ObjCTypeParamVariance::Contravariant:
        Out << "__contravariant ";
        break;
      }
  
      Out << Param->getDeclName();
  
      if (Param->hasExplicitBound()) {
        Out << " : " << Param->getUnderlyingType().getAsString(Policy);
      }
    }
    Out << ">";
  }
  
  void DeclPrinter::VisitObjCMethodDecl(ObjCMethodDecl *OMD) {
    if (OMD->isInstanceMethod())
      Out << "- ";
    else
      Out << "+ ";
    if (!OMD->getReturnType().isNull()) {
      PrintObjCMethodType(OMD->getASTContext(), OMD->getObjCDeclQualifier(),
                          OMD->getReturnType());
    }
  
    std::string name = OMD->getSelector().getAsString();
    std::string::size_type pos, lastPos = 0;
    for (const auto *PI : OMD->parameters()) {
      // FIXME: selector is missing here!
      pos = name.find_first_of(':', lastPos);
      if (lastPos != 0)
        Out << " ";
      Out << name.substr(lastPos, pos - lastPos) << ':';
      PrintObjCMethodType(OMD->getASTContext(),
                          PI->getObjCDeclQualifier(),
                          PI->getType());
      Out << *PI;
      lastPos = pos + 1;
    }
  
    if (OMD->param_begin() == OMD->param_end())
      Out << name;
  
    if (OMD->isVariadic())
        Out << ", ...";
  
    prettyPrintAttributes(OMD);
  
    if (OMD->getBody() && !Policy.TerseOutput) {
      Out << ' ';
      OMD->getBody()->printPretty(Out, nullptr, Policy, Indentation, "\n",
                                  &Context);
    }
    else if (Policy.PolishForDeclaration)
      Out << ';';
  }
  
  void DeclPrinter::VisitObjCImplementationDecl(ObjCImplementationDecl *OID) {
    std::string I = OID->getNameAsString();
    ObjCInterfaceDecl *SID = OID->getSuperClass();
  
    bool eolnOut = false;
    if (SID)
      Out << "@implementation " << I << " : " << *SID;
    else
      Out << "@implementation " << I;
  
    if (OID->ivar_size() > 0) {
      Out << "{\n";
      eolnOut = true;
      Indentation += Policy.Indentation;
      for (const auto *I : OID->ivars()) {
        Indent() << I->getASTContext().getUnqualifiedObjCPointerType(I->getType()).
                      getAsString(Policy) << ' ' << *I << ";\n";
      }
      Indentation -= Policy.Indentation;
      Out << "}\n";
    }
    else if (SID || (OID->decls_begin() != OID->decls_end())) {
      Out << "\n";
      eolnOut = true;
    }
    VisitDeclContext(OID, false);
    if (!eolnOut)
      Out << "\n";
    Out << "@end";
  }
  
  void DeclPrinter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *OID) {
    std::string I = OID->getNameAsString();
    ObjCInterfaceDecl *SID = OID->getSuperClass();
  
    if (!OID->isThisDeclarationADefinition()) {
      Out << "@class " << I;
  
      if (auto TypeParams = OID->getTypeParamListAsWritten()) {
        PrintObjCTypeParams(TypeParams);
      }
  
      Out << ";";
      return;
    }
    bool eolnOut = false;
    Out << "@interface " << I;
  
    if (auto TypeParams = OID->getTypeParamListAsWritten()) {
      PrintObjCTypeParams(TypeParams);
    }
  
    if (SID)
      Out << " : " << QualType(OID->getSuperClassType(), 0).getAsString(Policy);
  
    // Protocols?
    const ObjCList<ObjCProtocolDecl> &Protocols = OID->getReferencedProtocols();
    if (!Protocols.empty()) {
      for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
           E = Protocols.end(); I != E; ++I)
        Out << (I == Protocols.begin() ? '<' : ',') << **I;
      Out << "> ";
    }
  
    if (OID->ivar_size() > 0) {
      Out << "{\n";
      eolnOut = true;
      Indentation += Policy.Indentation;
      for (const auto *I : OID->ivars()) {
        Indent() << I->getASTContext()
                        .getUnqualifiedObjCPointerType(I->getType())
                        .getAsString(Policy) << ' ' << *I << ";\n";
      }
      Indentation -= Policy.Indentation;
      Out << "}\n";
    }
    else if (SID || (OID->decls_begin() != OID->decls_end())) {
      Out << "\n";
      eolnOut = true;
    }
  
    VisitDeclContext(OID, false);
    if (!eolnOut)
      Out << "\n";
    Out << "@end";
    // FIXME: implement the rest...
  }
  
  void DeclPrinter::VisitObjCProtocolDecl(ObjCProtocolDecl *PID) {
    if (!PID->isThisDeclarationADefinition()) {
      Out << "@protocol " << *PID << ";\n";
      return;
    }
    // Protocols?
    const ObjCList<ObjCProtocolDecl> &Protocols = PID->getReferencedProtocols();
    if (!Protocols.empty()) {
      Out << "@protocol " << *PID;
      for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
           E = Protocols.end(); I != E; ++I)
        Out << (I == Protocols.begin() ? '<' : ',') << **I;
      Out << ">\n";
    } else
      Out << "@protocol " << *PID << '\n';
    VisitDeclContext(PID, false);
    Out << "@end";
  }
  
  void DeclPrinter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *PID) {
    Out << "@implementation ";
    if (const auto *CID = PID->getClassInterface())
      Out << *CID;
    else
      Out << "<<error-type>>";
    Out << '(' << *PID << ")\n";
  
    VisitDeclContext(PID, false);
    Out << "@end";
    // FIXME: implement the rest...
  }
  
  void DeclPrinter::VisitObjCCategoryDecl(ObjCCategoryDecl *PID) {
    Out << "@interface ";
    if (const auto *CID = PID->getClassInterface())
      Out << *CID;
    else
      Out << "<<error-type>>";
    if (auto TypeParams = PID->getTypeParamList()) {
      PrintObjCTypeParams(TypeParams);
    }
    Out << "(" << *PID << ")\n";
    if (PID->ivar_size() > 0) {
      Out << "{\n";
      Indentation += Policy.Indentation;
      for (const auto *I : PID->ivars())
        Indent() << I->getASTContext().getUnqualifiedObjCPointerType(I->getType()).
                      getAsString(Policy) << ' ' << *I << ";\n";
      Indentation -= Policy.Indentation;
      Out << "}\n";
    }
  
    VisitDeclContext(PID, false);
    Out << "@end";
  
    // FIXME: implement the rest...
  }
  
  void DeclPrinter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *AID) {
    Out << "@compatibility_alias " << *AID
        << ' ' << *AID->getClassInterface() << ";\n";
  }
  
  /// PrintObjCPropertyDecl - print a property declaration.
  ///
  /// Print attributes in the following order:
  /// - class
  /// - nonatomic | atomic
  /// - assign | retain | strong | copy | weak | unsafe_unretained
  /// - readwrite | readonly
  /// - getter & setter
  /// - nullability
  void DeclPrinter::VisitObjCPropertyDecl(ObjCPropertyDecl *PDecl) {
    if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Required)
      Out << "@required\n";
    else if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Optional)
      Out << "@optional\n";
  
    QualType T = PDecl->getType();
  
    Out << "@property";
    if (PDecl->getPropertyAttributes() != ObjCPropertyAttribute::kind_noattr) {
      bool first = true;
      Out << "(";
      if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_class) {
        Out << (first ? "" : ", ") << "class";
        first = false;
      }
  
      if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_direct) {
        Out << (first ? "" : ", ") << "direct";
        first = false;
      }
  
      if (PDecl->getPropertyAttributes() &
          ObjCPropertyAttribute::kind_nonatomic) {
        Out << (first ? "" : ", ") << "nonatomic";
        first = false;
      }
      if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_atomic) {
        Out << (first ? "" : ", ") << "atomic";
        first = false;
      }
  
      if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_assign) {
        Out << (first ? "" : ", ") << "assign";
        first = false;
      }
      if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_retain) {
        Out << (first ? "" : ", ") << "retain";
        first = false;
      }
  
      if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_strong) {
        Out << (first ? "" : ", ") << "strong";
        first = false;
      }
      if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_copy) {
        Out << (first ? "" : ", ") << "copy";
        first = false;
      }
      if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_weak) {
        Out << (first ? "" : ", ") << "weak";
        first = false;
      }
      if (PDecl->getPropertyAttributes() &
          ObjCPropertyAttribute::kind_unsafe_unretained) {
        Out << (first ? "" : ", ") << "unsafe_unretained";
        first = false;
      }
  
      if (PDecl->getPropertyAttributes() &
          ObjCPropertyAttribute::kind_readwrite) {
        Out << (first ? "" : ", ") << "readwrite";
        first = false;
      }
      if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_readonly) {
        Out << (first ? "" : ", ") << "readonly";
        first = false;
      }
  
      if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_getter) {
        Out << (first ? "" : ", ") << "getter = ";
        PDecl->getGetterName().print(Out);
        first = false;
      }
      if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_setter) {
        Out << (first ? "" : ", ") << "setter = ";
        PDecl->getSetterName().print(Out);
        first = false;
      }
  
      if (PDecl->getPropertyAttributes() &
          ObjCPropertyAttribute::kind_nullability) {
        if (auto nullability = AttributedType::stripOuterNullability(T)) {
          if (*nullability == NullabilityKind::Unspecified &&
              (PDecl->getPropertyAttributes() &
               ObjCPropertyAttribute::kind_null_resettable)) {
            Out << (first ? "" : ", ") << "null_resettable";
          } else {
            Out << (first ? "" : ", ")
                << getNullabilitySpelling(*nullability, true);
          }
          first = false;
        }
      }
  
      (void) first; // Silence dead store warning due to idiomatic code.
      Out << ")";
    }
    std::string TypeStr = PDecl->getASTContext().getUnqualifiedObjCPointerType(T).
        getAsString(Policy);
    Out << ' ' << TypeStr;
    if (!StringRef(TypeStr).endswith("*"))
      Out << ' ';
    Out << *PDecl;
    if (Policy.PolishForDeclaration)
      Out << ';';
  }
  
  void DeclPrinter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *PID) {
    if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize)
      Out << "@synthesize ";
    else
      Out << "@dynamic ";
    Out << *PID->getPropertyDecl();
    if (PID->getPropertyIvarDecl())
      Out << '=' << *PID->getPropertyIvarDecl();
  }
  
  void DeclPrinter::VisitUsingDecl(UsingDecl *D) {
    if (!D->isAccessDeclaration())
      Out << "using ";
    if (D->hasTypename())
      Out << "typename ";
    D->getQualifier()->print(Out, Policy);
  
    // Use the correct record name when the using declaration is used for
    // inheriting constructors.
    for (const auto *Shadow : D->shadows()) {
      if (const auto *ConstructorShadow =
              dyn_cast<ConstructorUsingShadowDecl>(Shadow)) {
        assert(Shadow->getDeclContext() == ConstructorShadow->getDeclContext());
        Out << *ConstructorShadow->getNominatedBaseClass();
        return;
      }
    }
    Out << *D;
  }
  
  void DeclPrinter::VisitUsingEnumDecl(UsingEnumDecl *D) {
    Out << "using enum " << D->getEnumDecl();
  }
  
  void
  DeclPrinter::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) {
    Out << "using typename ";
    D->getQualifier()->print(Out, Policy);
    Out << D->getDeclName();
  }
  
  void DeclPrinter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
    if (!D->isAccessDeclaration())
      Out << "using ";
    D->getQualifier()->print(Out, Policy);
    Out << D->getDeclName();
  }
  
  void DeclPrinter::VisitUsingShadowDecl(UsingShadowDecl *D) {
    // ignore
  }
  
  void DeclPrinter::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
    Out << "#pragma omp threadprivate";
    if (!D->varlist_empty()) {
      for (OMPThreadPrivateDecl::varlist_iterator I = D->varlist_begin(),
                                                  E = D->varlist_end();
                                                  I != E; ++I) {
        Out << (I == D->varlist_begin() ? '(' : ',');
        NamedDecl *ND = cast<DeclRefExpr>(*I)->getDecl();
        ND->printQualifiedName(Out);
      }
      Out << ")";
    }
  }
  
  void DeclPrinter::VisitOMPAllocateDecl(OMPAllocateDecl *D) {
    Out << "#pragma omp allocate";
    if (!D->varlist_empty()) {
      for (OMPAllocateDecl::varlist_iterator I = D->varlist_begin(),
                                             E = D->varlist_end();
           I != E; ++I) {
        Out << (I == D->varlist_begin() ? '(' : ',');
        NamedDecl *ND = cast<DeclRefExpr>(*I)->getDecl();
        ND->printQualifiedName(Out);
      }
      Out << ")";
    }
    if (!D->clauselist_empty()) {
      OMPClausePrinter Printer(Out, Policy);
      for (OMPClause *C : D->clauselists()) {
        Out << " ";
        Printer.Visit(C);
      }
    }
  }
  
  void DeclPrinter::VisitOMPRequiresDecl(OMPRequiresDecl *D) {
    Out << "#pragma omp requires ";
    if (!D->clauselist_empty()) {
      OMPClausePrinter Printer(Out, Policy);
      for (auto I = D->clauselist_begin(), E = D->clauselist_end(); I != E; ++I)
        Printer.Visit(*I);
    }
  }
  
  void DeclPrinter::VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D) {
    if (!D->isInvalidDecl()) {
      Out << "#pragma omp declare reduction (";
      if (D->getDeclName().getNameKind() == DeclarationName::CXXOperatorName) {
        const char *OpName =
            getOperatorSpelling(D->getDeclName().getCXXOverloadedOperator());
        assert(OpName && "not an overloaded operator");
        Out << OpName;
      } else {
        assert(D->getDeclName().isIdentifier());
        D->printName(Out);
      }
      Out << " : ";
      D->getType().print(Out, Policy);
      Out << " : ";
      D->getCombiner()->printPretty(Out, nullptr, Policy, 0, "\n", &Context);
      Out << ")";
      if (auto *Init = D->getInitializer()) {
        Out << " initializer(";
        switch (D->getInitializerKind()) {
        case OMPDeclareReductionDecl::DirectInit:
          Out << "omp_priv(";
          break;
        case OMPDeclareReductionDecl::CopyInit:
          Out << "omp_priv = ";
          break;
        case OMPDeclareReductionDecl::CallInit:
          break;
        }
        Init->printPretty(Out, nullptr, Policy, 0, "\n", &Context);
        if (D->getInitializerKind() == OMPDeclareReductionDecl::DirectInit)
          Out << ")";
        Out << ")";
      }
    }
  }
  
  void DeclPrinter::VisitOMPDeclareMapperDecl(OMPDeclareMapperDecl *D) {
    if (!D->isInvalidDecl()) {
      Out << "#pragma omp declare mapper (";
      D->printName(Out);
      Out << " : ";
      D->getType().print(Out, Policy);
      Out << " ";
      Out << D->getVarName();
      Out << ")";
      if (!D->clauselist_empty()) {
        OMPClausePrinter Printer(Out, Policy);
        for (auto *C : D->clauselists()) {
          Out << " ";
          Printer.Visit(C);
        }
      }
    }
  }
  
  void DeclPrinter::VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D) {
    D->getInit()->printPretty(Out, nullptr, Policy, Indentation, "\n", &Context);
  }
  
  void DeclPrinter::VisitTemplateTypeParmDecl(const TemplateTypeParmDecl *TTP) {
    if (const TypeConstraint *TC = TTP->getTypeConstraint())
      TC->print(Out, Policy);
    else if (TTP->wasDeclaredWithTypename())
      Out << "typename";
    else
      Out << "class";
  
    if (TTP->isParameterPack())
      Out << " ...";
    else if (TTP->getDeclName())
      Out << ' ';
  
    if (TTP->getDeclName()) {
      if (Policy.CleanUglifiedParameters && TTP->getIdentifier())
        Out << TTP->getIdentifier()->deuglifiedName();
      else
        Out << TTP->getDeclName();
    }
  
    if (TTP->hasDefaultArgument() && !Policy.SuppressDefaultTemplateArguments) {
      Out << " = ";
      Out << TTP->getDefaultArgument().getAsString(Policy);
    }
  }
  
  void DeclPrinter::VisitNonTypeTemplateParmDecl(
      const NonTypeTemplateParmDecl *NTTP) {
    StringRef Name;
    if (IdentifierInfo *II = NTTP->getIdentifier())
      Name =
          Policy.CleanUglifiedParameters ? II->deuglifiedName() : II->getName();
    printDeclType(NTTP->getType(), Name, NTTP->isParameterPack());
  
    if (NTTP->hasDefaultArgument() && !Policy.SuppressDefaultTemplateArguments) {
      Out << " = ";
      NTTP->getDefaultArgument()->printPretty(Out, nullptr, Policy, Indentation,
                                              "\n", &Context);
    }
  }
  