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