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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::dump method, which pretty print 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/DeclVisitor.h"
     16 #include "clang/AST/Decl.h"
     17 #include "clang/AST/DeclCXX.h"
     18 #include "clang/AST/DeclObjC.h"
     19 #include "clang/AST/Expr.h"
     20 #include "clang/AST/ExprCXX.h"
     21 #include "clang/AST/PrettyPrinter.h"
     22 #include "llvm/Support/raw_ostream.h"
     23 using namespace clang;
     24 
     25 namespace {
     26   class DeclPrinter : public DeclVisitor<DeclPrinter> {
     27     raw_ostream &Out;
     28     ASTContext &Context;
     29     PrintingPolicy Policy;
     30     unsigned Indentation;
     31     bool PrintInstantiation;
     32 
     33     raw_ostream& Indent() { return Indent(Indentation); }
     34     raw_ostream& Indent(unsigned Indentation);
     35     void ProcessDeclGroup(SmallVectorImpl<Decl*>& Decls);
     36 
     37     void Print(AccessSpecifier AS);
     38 
     39   public:
     40     DeclPrinter(raw_ostream &Out, ASTContext &Context,
     41                 const PrintingPolicy &Policy,
     42                 unsigned Indentation = 0,
     43                 bool PrintInstantiation = false)
     44       : Out(Out), Context(Context), Policy(Policy), Indentation(Indentation),
     45         PrintInstantiation(PrintInstantiation) { }
     46 
     47     void VisitDeclContext(DeclContext *DC, bool Indent = true);
     48 
     49     void VisitTranslationUnitDecl(TranslationUnitDecl *D);
     50     void VisitTypedefDecl(TypedefDecl *D);
     51     void VisitTypeAliasDecl(TypeAliasDecl *D);
     52     void VisitEnumDecl(EnumDecl *D);
     53     void VisitRecordDecl(RecordDecl *D);
     54     void VisitEnumConstantDecl(EnumConstantDecl *D);
     55     void VisitFunctionDecl(FunctionDecl *D);
     56     void VisitFieldDecl(FieldDecl *D);
     57     void VisitVarDecl(VarDecl *D);
     58     void VisitLabelDecl(LabelDecl *D);
     59     void VisitParmVarDecl(ParmVarDecl *D);
     60     void VisitFileScopeAsmDecl(FileScopeAsmDecl *D);
     61     void VisitStaticAssertDecl(StaticAssertDecl *D);
     62     void VisitNamespaceDecl(NamespaceDecl *D);
     63     void VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
     64     void VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
     65     void VisitCXXRecordDecl(CXXRecordDecl *D);
     66     void VisitLinkageSpecDecl(LinkageSpecDecl *D);
     67     void VisitTemplateDecl(const TemplateDecl *D);
     68     void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
     69     void VisitClassTemplateDecl(ClassTemplateDecl *D);
     70     void VisitObjCMethodDecl(ObjCMethodDecl *D);
     71     void VisitObjCClassDecl(ObjCClassDecl *D);
     72     void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
     73     void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
     74     void VisitObjCForwardProtocolDecl(ObjCForwardProtocolDecl *D);
     75     void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
     76     void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
     77     void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
     78     void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
     79     void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
     80     void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
     81     void VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
     82     void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
     83     void VisitUsingDecl(UsingDecl *D);
     84     void VisitUsingShadowDecl(UsingShadowDecl *D);
     85 
     86     void PrintTemplateParameters(const TemplateParameterList *Params,
     87                                  const TemplateArgumentList *Args);
     88   };
     89 }
     90 
     91 void Decl::print(raw_ostream &Out, unsigned Indentation,
     92                  bool PrintInstantiation) const {
     93   print(Out, getASTContext().getPrintingPolicy(), Indentation, PrintInstantiation);
     94 }
     95 
     96 void Decl::print(raw_ostream &Out, const PrintingPolicy &Policy,
     97                  unsigned Indentation, bool PrintInstantiation) const {
     98   DeclPrinter Printer(Out, getASTContext(), Policy, Indentation, PrintInstantiation);
     99   Printer.Visit(const_cast<Decl*>(this));
    100 }
    101 
    102 static QualType GetBaseType(QualType T) {
    103   // FIXME: This should be on the Type class!
    104   QualType BaseType = T;
    105   while (!BaseType->isSpecifierType()) {
    106     if (isa<TypedefType>(BaseType))
    107       break;
    108     else if (const PointerType* PTy = BaseType->getAs<PointerType>())
    109       BaseType = PTy->getPointeeType();
    110     else if (const ArrayType* ATy = dyn_cast<ArrayType>(BaseType))
    111       BaseType = ATy->getElementType();
    112     else if (const FunctionType* FTy = BaseType->getAs<FunctionType>())
    113       BaseType = FTy->getResultType();
    114     else if (const VectorType *VTy = BaseType->getAs<VectorType>())
    115       BaseType = VTy->getElementType();
    116     else
    117       llvm_unreachable("Unknown declarator!");
    118   }
    119   return BaseType;
    120 }
    121 
    122 static QualType getDeclType(Decl* D) {
    123   if (TypedefNameDecl* TDD = dyn_cast<TypedefNameDecl>(D))
    124     return TDD->getUnderlyingType();
    125   if (ValueDecl* VD = dyn_cast<ValueDecl>(D))
    126     return VD->getType();
    127   return QualType();
    128 }
    129 
    130 void Decl::printGroup(Decl** Begin, unsigned NumDecls,
    131                       raw_ostream &Out, const PrintingPolicy &Policy,
    132                       unsigned Indentation) {
    133   if (NumDecls == 1) {
    134     (*Begin)->print(Out, Policy, Indentation);
    135     return;
    136   }
    137 
    138   Decl** End = Begin + NumDecls;
    139   TagDecl* TD = dyn_cast<TagDecl>(*Begin);
    140   if (TD)
    141     ++Begin;
    142 
    143   PrintingPolicy SubPolicy(Policy);
    144   if (TD && TD->isCompleteDefinition()) {
    145     TD->print(Out, Policy, Indentation);
    146     Out << " ";
    147     SubPolicy.SuppressTag = true;
    148   }
    149 
    150   bool isFirst = true;
    151   for ( ; Begin != End; ++Begin) {
    152     if (isFirst) {
    153       SubPolicy.SuppressSpecifiers = false;
    154       isFirst = false;
    155     } else {
    156       if (!isFirst) Out << ", ";
    157       SubPolicy.SuppressSpecifiers = true;
    158     }
    159 
    160     (*Begin)->print(Out, SubPolicy, Indentation);
    161   }
    162 }
    163 
    164 void DeclContext::dumpDeclContext() const {
    165   // Get the translation unit
    166   const DeclContext *DC = this;
    167   while (!DC->isTranslationUnit())
    168     DC = DC->getParent();
    169 
    170   ASTContext &Ctx = cast<TranslationUnitDecl>(DC)->getASTContext();
    171   DeclPrinter Printer(llvm::errs(), Ctx, Ctx.getPrintingPolicy(), 0);
    172   Printer.VisitDeclContext(const_cast<DeclContext *>(this), /*Indent=*/false);
    173 }
    174 
    175 void Decl::dump() const {
    176   print(llvm::errs());
    177 }
    178 
    179 raw_ostream& DeclPrinter::Indent(unsigned Indentation) {
    180   for (unsigned i = 0; i != Indentation; ++i)
    181     Out << "  ";
    182   return Out;
    183 }
    184 
    185 void DeclPrinter::ProcessDeclGroup(SmallVectorImpl<Decl*>& Decls) {
    186   this->Indent();
    187   Decl::printGroup(Decls.data(), Decls.size(), Out, Policy, Indentation);
    188   Out << ";\n";
    189   Decls.clear();
    190 
    191 }
    192 
    193 void DeclPrinter::Print(AccessSpecifier AS) {
    194   switch(AS) {
    195   case AS_none:      llvm_unreachable("No access specifier!");
    196   case AS_public:    Out << "public"; break;
    197   case AS_protected: Out << "protected"; break;
    198   case AS_private:   Out << "private"; break;
    199   }
    200 }
    201 
    202 //----------------------------------------------------------------------------
    203 // Common C declarations
    204 //----------------------------------------------------------------------------
    205 
    206 void DeclPrinter::VisitDeclContext(DeclContext *DC, bool Indent) {
    207   if (Indent)
    208     Indentation += Policy.Indentation;
    209 
    210   SmallVector<Decl*, 2> Decls;
    211   for (DeclContext::decl_iterator D = DC->decls_begin(), DEnd = DC->decls_end();
    212        D != DEnd; ++D) {
    213 
    214     // Don't print ObjCIvarDecls, as they are printed when visiting the
    215     // containing ObjCInterfaceDecl.
    216     if (isa<ObjCIvarDecl>(*D))
    217       continue;
    218 
    219     if (!Policy.Dump) {
    220       // Skip over implicit declarations in pretty-printing mode.
    221       if (D->isImplicit()) continue;
    222       // FIXME: Ugly hack so we don't pretty-print the builtin declaration
    223       // of __builtin_va_list or __[u]int128_t.  There should be some other way
    224       // to check that.
    225       if (NamedDecl *ND = dyn_cast<NamedDecl>(*D)) {
    226         if (IdentifierInfo *II = ND->getIdentifier()) {
    227           if (II->isStr("__builtin_va_list") ||
    228               II->isStr("__int128_t") || II->isStr("__uint128_t"))
    229             continue;
    230         }
    231       }
    232     }
    233 
    234     // The next bits of code handles stuff like "struct {int x;} a,b"; we're
    235     // forced to merge the declarations because there's no other way to
    236     // refer to the struct in question.  This limited merging is safe without
    237     // a bunch of other checks because it only merges declarations directly
    238     // referring to the tag, not typedefs.
    239     //
    240     // Check whether the current declaration should be grouped with a previous
    241     // unnamed struct.
    242     QualType CurDeclType = getDeclType(*D);
    243     if (!Decls.empty() && !CurDeclType.isNull()) {
    244       QualType BaseType = GetBaseType(CurDeclType);
    245       if (!BaseType.isNull() && isa<TagType>(BaseType) &&
    246           cast<TagType>(BaseType)->getDecl() == Decls[0]) {
    247         Decls.push_back(*D);
    248         continue;
    249       }
    250     }
    251 
    252     // If we have a merged group waiting to be handled, handle it now.
    253     if (!Decls.empty())
    254       ProcessDeclGroup(Decls);
    255 
    256     // If the current declaration is an unnamed tag type, save it
    257     // so we can merge it with the subsequent declaration(s) using it.
    258     if (isa<TagDecl>(*D) && !cast<TagDecl>(*D)->getIdentifier()) {
    259       Decls.push_back(*D);
    260       continue;
    261     }
    262 
    263     if (isa<AccessSpecDecl>(*D)) {
    264       Indentation -= Policy.Indentation;
    265       this->Indent();
    266       Print(D->getAccess());
    267       Out << ":\n";
    268       Indentation += Policy.Indentation;
    269       continue;
    270     }
    271 
    272     this->Indent();
    273     Visit(*D);
    274 
    275     // FIXME: Need to be able to tell the DeclPrinter when
    276     const char *Terminator = 0;
    277     if (isa<FunctionDecl>(*D) &&
    278         cast<FunctionDecl>(*D)->isThisDeclarationADefinition())
    279       Terminator = 0;
    280     else if (isa<ObjCMethodDecl>(*D) && cast<ObjCMethodDecl>(*D)->getBody())
    281       Terminator = 0;
    282     else if (isa<NamespaceDecl>(*D) || isa<LinkageSpecDecl>(*D) ||
    283              isa<ObjCImplementationDecl>(*D) ||
    284              isa<ObjCInterfaceDecl>(*D) ||
    285              isa<ObjCProtocolDecl>(*D) ||
    286              isa<ObjCCategoryImplDecl>(*D) ||
    287              isa<ObjCCategoryDecl>(*D))
    288       Terminator = 0;
    289     else if (isa<EnumConstantDecl>(*D)) {
    290       DeclContext::decl_iterator Next = D;
    291       ++Next;
    292       if (Next != DEnd)
    293         Terminator = ",";
    294     } else
    295       Terminator = ";";
    296 
    297     if (Terminator)
    298       Out << Terminator;
    299     Out << "\n";
    300   }
    301 
    302   if (!Decls.empty())
    303     ProcessDeclGroup(Decls);
    304 
    305   if (Indent)
    306     Indentation -= Policy.Indentation;
    307 }
    308 
    309 void DeclPrinter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
    310   VisitDeclContext(D, false);
    311 }
    312 
    313 void DeclPrinter::VisitTypedefDecl(TypedefDecl *D) {
    314   std::string S = D->getNameAsString();
    315   D->getUnderlyingType().getAsStringInternal(S, Policy);
    316   if (!Policy.SuppressSpecifiers) {
    317     Out << "typedef ";
    318 
    319     if (D->isModulePrivate())
    320       Out << "__module_private__ ";
    321   }
    322   Out << S;
    323 }
    324 
    325 void DeclPrinter::VisitTypeAliasDecl(TypeAliasDecl *D) {
    326   Out << "using " << D->getNameAsString() << " = "
    327       << D->getUnderlyingType().getAsString(Policy);
    328 }
    329 
    330 void DeclPrinter::VisitEnumDecl(EnumDecl *D) {
    331   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
    332     Out << "__module_private__ ";
    333   Out << "enum ";
    334   if (D->isScoped()) {
    335     if (D->isScopedUsingClassTag())
    336       Out << "class ";
    337     else
    338       Out << "struct ";
    339   }
    340   Out << *D;
    341 
    342   if (D->isFixed()) {
    343     std::string Underlying;
    344     D->getIntegerType().getAsStringInternal(Underlying, Policy);
    345     Out << " : " << Underlying;
    346   }
    347 
    348   if (D->isCompleteDefinition()) {
    349     Out << " {\n";
    350     VisitDeclContext(D);
    351     Indent() << "}";
    352   }
    353 }
    354 
    355 void DeclPrinter::VisitRecordDecl(RecordDecl *D) {
    356   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
    357     Out << "__module_private__ ";
    358   Out << D->getKindName();
    359   if (D->getIdentifier())
    360     Out << ' ' << *D;
    361 
    362   if (D->isCompleteDefinition()) {
    363     Out << " {\n";
    364     VisitDeclContext(D);
    365     Indent() << "}";
    366   }
    367 }
    368 
    369 void DeclPrinter::VisitEnumConstantDecl(EnumConstantDecl *D) {
    370   Out << *D;
    371   if (Expr *Init = D->getInitExpr()) {
    372     Out << " = ";
    373     Init->printPretty(Out, Context, 0, Policy, Indentation);
    374   }
    375 }
    376 
    377 void DeclPrinter::VisitFunctionDecl(FunctionDecl *D) {
    378   if (!Policy.SuppressSpecifiers) {
    379     switch (D->getStorageClass()) {
    380     case SC_None: break;
    381     case SC_Extern: Out << "extern "; break;
    382     case SC_Static: Out << "static "; break;
    383     case SC_PrivateExtern: Out << "__private_extern__ "; break;
    384     case SC_Auto: case SC_Register: case SC_OpenCLWorkGroupLocal:
    385       llvm_unreachable("invalid for functions");
    386     }
    387 
    388     if (D->isInlineSpecified())  Out << "inline ";
    389     if (D->isVirtualAsWritten()) Out << "virtual ";
    390     if (D->isModulePrivate())    Out << "__module_private__ ";
    391   }
    392 
    393   PrintingPolicy SubPolicy(Policy);
    394   SubPolicy.SuppressSpecifiers = false;
    395   std::string Proto = D->getNameInfo().getAsString();
    396 
    397   QualType Ty = D->getType();
    398   while (const ParenType *PT = dyn_cast<ParenType>(Ty)) {
    399     Proto = '(' + Proto + ')';
    400     Ty = PT->getInnerType();
    401   }
    402 
    403   if (isa<FunctionType>(Ty)) {
    404     const FunctionType *AFT = Ty->getAs<FunctionType>();
    405     const FunctionProtoType *FT = 0;
    406     if (D->hasWrittenPrototype())
    407       FT = dyn_cast<FunctionProtoType>(AFT);
    408 
    409     Proto += "(";
    410     if (FT) {
    411       llvm::raw_string_ostream POut(Proto);
    412       DeclPrinter ParamPrinter(POut, Context, SubPolicy, Indentation);
    413       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
    414         if (i) POut << ", ";
    415         ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
    416       }
    417 
    418       if (FT->isVariadic()) {
    419         if (D->getNumParams()) POut << ", ";
    420         POut << "...";
    421       }
    422     } else if (D->doesThisDeclarationHaveABody() && !D->hasPrototype()) {
    423       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
    424         if (i)
    425           Proto += ", ";
    426         Proto += D->getParamDecl(i)->getNameAsString();
    427       }
    428     }
    429 
    430     Proto += ")";
    431 
    432     if (FT && FT->getTypeQuals()) {
    433       unsigned TypeQuals = FT->getTypeQuals();
    434       if (TypeQuals & Qualifiers::Const)
    435         Proto += " const";
    436       if (TypeQuals & Qualifiers::Volatile)
    437         Proto += " volatile";
    438       if (TypeQuals & Qualifiers::Restrict)
    439         Proto += " restrict";
    440     }
    441 
    442     if (FT && FT->hasDynamicExceptionSpec()) {
    443       Proto += " throw(";
    444       if (FT->getExceptionSpecType() == EST_MSAny)
    445         Proto += "...";
    446       else
    447         for (unsigned I = 0, N = FT->getNumExceptions(); I != N; ++I) {
    448           if (I)
    449             Proto += ", ";
    450 
    451           std::string ExceptionType;
    452           FT->getExceptionType(I).getAsStringInternal(ExceptionType, SubPolicy);
    453           Proto += ExceptionType;
    454         }
    455       Proto += ")";
    456     } else if (FT && isNoexceptExceptionSpec(FT->getExceptionSpecType())) {
    457       Proto += " noexcept";
    458       if (FT->getExceptionSpecType() == EST_ComputedNoexcept) {
    459         Proto += "(";
    460         llvm::raw_string_ostream EOut(Proto);
    461         FT->getNoexceptExpr()->printPretty(EOut, Context, 0, SubPolicy,
    462                                            Indentation);
    463         EOut.flush();
    464         Proto += EOut.str();
    465         Proto += ")";
    466       }
    467     }
    468 
    469     if (D->hasAttr<NoReturnAttr>())
    470       Proto += " __attribute((noreturn))";
    471 
    472     if (D->hasAttr<ReturnsTwiceAttr>())
    473       Proto += " __attribute((returns_twice))";
    474 
    475     if (CXXConstructorDecl *CDecl = dyn_cast<CXXConstructorDecl>(D)) {
    476       bool HasInitializerList = false;
    477       for (CXXConstructorDecl::init_const_iterator B = CDecl->init_begin(),
    478            E = CDecl->init_end();
    479            B != E; ++B) {
    480         CXXCtorInitializer * BMInitializer = (*B);
    481         if (BMInitializer->isInClassMemberInitializer())
    482           continue;
    483 
    484         if (!HasInitializerList) {
    485           Proto += " : ";
    486           Out << Proto;
    487           Proto.clear();
    488           HasInitializerList = true;
    489         } else
    490           Out << ", ";
    491 
    492         if (BMInitializer->isAnyMemberInitializer()) {
    493           FieldDecl *FD = BMInitializer->getAnyMember();
    494           Out << *FD;
    495         } else {
    496           Out << QualType(BMInitializer->getBaseClass(), 0).getAsString(Policy);
    497         }
    498 
    499         Out << "(";
    500         if (!BMInitializer->getInit()) {
    501           // Nothing to print
    502         } else {
    503           Expr *Init = BMInitializer->getInit();
    504           if (ExprWithCleanups *Tmp = dyn_cast<ExprWithCleanups>(Init))
    505             Init = Tmp->getSubExpr();
    506 
    507           Init = Init->IgnoreParens();
    508 
    509           Expr *SimpleInit = 0;
    510           Expr **Args = 0;
    511           unsigned NumArgs = 0;
    512           if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
    513             Args = ParenList->getExprs();
    514             NumArgs = ParenList->getNumExprs();
    515           } else if (CXXConstructExpr *Construct
    516                                         = dyn_cast<CXXConstructExpr>(Init)) {
    517             Args = Construct->getArgs();
    518             NumArgs = Construct->getNumArgs();
    519           } else
    520             SimpleInit = Init;
    521 
    522           if (SimpleInit)
    523             SimpleInit->printPretty(Out, Context, 0, Policy, Indentation);
    524           else {
    525             for (unsigned I = 0; I != NumArgs; ++I) {
    526               if (isa<CXXDefaultArgExpr>(Args[I]))
    527                 break;
    528 
    529               if (I)
    530                 Out << ", ";
    531               Args[I]->printPretty(Out, Context, 0, Policy, Indentation);
    532             }
    533           }
    534         }
    535         Out << ")";
    536       }
    537     }
    538     else
    539       AFT->getResultType().getAsStringInternal(Proto, Policy);
    540   } else {
    541     Ty.getAsStringInternal(Proto, Policy);
    542   }
    543 
    544   Out << Proto;
    545 
    546   if (D->isPure())
    547     Out << " = 0";
    548   else if (D->isDeletedAsWritten())
    549     Out << " = delete";
    550   else if (D->doesThisDeclarationHaveABody()) {
    551     if (!D->hasPrototype() && D->getNumParams()) {
    552       // This is a K&R function definition, so we need to print the
    553       // parameters.
    554       Out << '\n';
    555       DeclPrinter ParamPrinter(Out, Context, SubPolicy, Indentation);
    556       Indentation += Policy.Indentation;
    557       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
    558         Indent();
    559         ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
    560         Out << ";\n";
    561       }
    562       Indentation -= Policy.Indentation;
    563     } else
    564       Out << ' ';
    565 
    566     D->getBody()->printPretty(Out, Context, 0, SubPolicy, Indentation);
    567     Out << '\n';
    568   }
    569 }
    570 
    571 void DeclPrinter::VisitFieldDecl(FieldDecl *D) {
    572   if (!Policy.SuppressSpecifiers && D->isMutable())
    573     Out << "mutable ";
    574   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
    575     Out << "__module_private__ ";
    576 
    577   std::string Name = D->getNameAsString();
    578   D->getType().getAsStringInternal(Name, Policy);
    579   Out << Name;
    580 
    581   if (D->isBitField()) {
    582     Out << " : ";
    583     D->getBitWidth()->printPretty(Out, Context, 0, Policy, Indentation);
    584   }
    585 
    586   Expr *Init = D->getInClassInitializer();
    587   if (!Policy.SuppressInitializers && Init) {
    588     Out << " = ";
    589     Init->printPretty(Out, Context, 0, Policy, Indentation);
    590   }
    591 }
    592 
    593 void DeclPrinter::VisitLabelDecl(LabelDecl *D) {
    594   Out << D->getNameAsString() << ":";
    595 }
    596 
    597 
    598 void DeclPrinter::VisitVarDecl(VarDecl *D) {
    599   if (!Policy.SuppressSpecifiers && D->getStorageClass() != SC_None)
    600     Out << VarDecl::getStorageClassSpecifierString(D->getStorageClass()) << " ";
    601 
    602   if (!Policy.SuppressSpecifiers && D->isThreadSpecified())
    603     Out << "__thread ";
    604   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
    605     Out << "__module_private__ ";
    606 
    607   std::string Name = D->getNameAsString();
    608   QualType T = D->getType();
    609   if (ParmVarDecl *Parm = dyn_cast<ParmVarDecl>(D))
    610     T = Parm->getOriginalType();
    611   T.getAsStringInternal(Name, Policy);
    612   Out << Name;
    613   Expr *Init = D->getInit();
    614   if (!Policy.SuppressInitializers && Init) {
    615     if (D->hasCXXDirectInitializer())
    616       Out << "(";
    617     else {
    618         CXXConstructExpr *CCE = dyn_cast<CXXConstructExpr>(Init);
    619         if (!CCE || CCE->getConstructor()->isCopyConstructor())
    620           Out << " = ";
    621     }
    622     Init->printPretty(Out, Context, 0, Policy, Indentation);
    623     if (D->hasCXXDirectInitializer())
    624       Out << ")";
    625   }
    626 }
    627 
    628 void DeclPrinter::VisitParmVarDecl(ParmVarDecl *D) {
    629   VisitVarDecl(D);
    630 }
    631 
    632 void DeclPrinter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
    633   Out << "__asm (";
    634   D->getAsmString()->printPretty(Out, Context, 0, Policy, Indentation);
    635   Out << ")";
    636 }
    637 
    638 void DeclPrinter::VisitStaticAssertDecl(StaticAssertDecl *D) {
    639   Out << "static_assert(";
    640   D->getAssertExpr()->printPretty(Out, Context, 0, Policy, Indentation);
    641   Out << ", ";
    642   D->getMessage()->printPretty(Out, Context, 0, Policy, Indentation);
    643   Out << ")";
    644 }
    645 
    646 //----------------------------------------------------------------------------
    647 // C++ declarations
    648 //----------------------------------------------------------------------------
    649 void DeclPrinter::VisitNamespaceDecl(NamespaceDecl *D) {
    650   Out << "namespace " << *D << " {\n";
    651   VisitDeclContext(D);
    652   Indent() << "}";
    653 }
    654 
    655 void DeclPrinter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
    656   Out << "using namespace ";
    657   if (D->getQualifier())
    658     D->getQualifier()->print(Out, Policy);
    659   Out << *D->getNominatedNamespaceAsWritten();
    660 }
    661 
    662 void DeclPrinter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
    663   Out << "namespace " << *D << " = ";
    664   if (D->getQualifier())
    665     D->getQualifier()->print(Out, Policy);
    666   Out << *D->getAliasedNamespace();
    667 }
    668 
    669 void DeclPrinter::VisitCXXRecordDecl(CXXRecordDecl *D) {
    670   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
    671     Out << "__module_private__ ";
    672   Out << D->getKindName();
    673   if (D->getIdentifier())
    674     Out << ' ' << *D;
    675 
    676   if (D->isCompleteDefinition()) {
    677     // Print the base classes
    678     if (D->getNumBases()) {
    679       Out << " : ";
    680       for (CXXRecordDecl::base_class_iterator Base = D->bases_begin(),
    681              BaseEnd = D->bases_end(); Base != BaseEnd; ++Base) {
    682         if (Base != D->bases_begin())
    683           Out << ", ";
    684 
    685         if (Base->isVirtual())
    686           Out << "virtual ";
    687 
    688         AccessSpecifier AS = Base->getAccessSpecifierAsWritten();
    689         if (AS != AS_none)
    690           Print(AS);
    691         Out << " " << Base->getType().getAsString(Policy);
    692 
    693         if (Base->isPackExpansion())
    694           Out << "...";
    695       }
    696     }
    697 
    698     // Print the class definition
    699     // FIXME: Doesn't print access specifiers, e.g., "public:"
    700     Out << " {\n";
    701     VisitDeclContext(D);
    702     Indent() << "}";
    703   }
    704 }
    705 
    706 void DeclPrinter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
    707   const char *l;
    708   if (D->getLanguage() == LinkageSpecDecl::lang_c)
    709     l = "C";
    710   else {
    711     assert(D->getLanguage() == LinkageSpecDecl::lang_cxx &&
    712            "unknown language in linkage specification");
    713     l = "C++";
    714   }
    715 
    716   Out << "extern \"" << l << "\" ";
    717   if (D->hasBraces()) {
    718     Out << "{\n";
    719     VisitDeclContext(D);
    720     Indent() << "}";
    721   } else
    722     Visit(*D->decls_begin());
    723 }
    724 
    725 void DeclPrinter::PrintTemplateParameters(
    726     const TemplateParameterList *Params, const TemplateArgumentList *Args = 0) {
    727   assert(Params);
    728   assert(!Args || Params->size() == Args->size());
    729 
    730   Out << "template <";
    731 
    732   for (unsigned i = 0, e = Params->size(); i != e; ++i) {
    733     if (i != 0)
    734       Out << ", ";
    735 
    736     const Decl *Param = Params->getParam(i);
    737     if (const TemplateTypeParmDecl *TTP =
    738           dyn_cast<TemplateTypeParmDecl>(Param)) {
    739 
    740       if (TTP->wasDeclaredWithTypename())
    741         Out << "typename ";
    742       else
    743         Out << "class ";
    744 
    745       if (TTP->isParameterPack())
    746         Out << "... ";
    747 
    748       Out << TTP->getNameAsString();
    749 
    750       if (Args) {
    751         Out << " = ";
    752         Args->get(i).print(Policy, Out);
    753       } else if (TTP->hasDefaultArgument()) {
    754         Out << " = ";
    755         Out << TTP->getDefaultArgument().getAsString(Policy);
    756       };
    757     } else if (const NonTypeTemplateParmDecl *NTTP =
    758                  dyn_cast<NonTypeTemplateParmDecl>(Param)) {
    759       Out << NTTP->getType().getAsString(Policy);
    760 
    761       if (NTTP->isParameterPack() && !isa<PackExpansionType>(NTTP->getType()))
    762         Out << "...";
    763 
    764       if (IdentifierInfo *Name = NTTP->getIdentifier()) {
    765         Out << ' ';
    766         Out << Name->getName();
    767       }
    768 
    769       if (Args) {
    770         Out << " = ";
    771         Args->get(i).print(Policy, Out);
    772       } else if (NTTP->hasDefaultArgument()) {
    773         Out << " = ";
    774         NTTP->getDefaultArgument()->printPretty(Out, Context, 0, Policy,
    775                                                 Indentation);
    776       }
    777     } else if (const TemplateTemplateParmDecl *TTPD =
    778                  dyn_cast<TemplateTemplateParmDecl>(Param)) {
    779       VisitTemplateDecl(TTPD);
    780       // FIXME: print the default argument, if present.
    781     }
    782   }
    783 
    784   Out << "> ";
    785 }
    786 
    787 void DeclPrinter::VisitTemplateDecl(const TemplateDecl *D) {
    788   PrintTemplateParameters(D->getTemplateParameters());
    789 
    790   if (const TemplateTemplateParmDecl *TTP =
    791         dyn_cast<TemplateTemplateParmDecl>(D)) {
    792     Out << "class ";
    793     if (TTP->isParameterPack())
    794       Out << "...";
    795     Out << D->getName();
    796   } else {
    797     Visit(D->getTemplatedDecl());
    798   }
    799 }
    800 
    801 void DeclPrinter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
    802   if (PrintInstantiation) {
    803     TemplateParameterList *Params = D->getTemplateParameters();
    804     for (FunctionTemplateDecl::spec_iterator I = D->spec_begin(), E = D->spec_end();
    805          I != E; ++I) {
    806       PrintTemplateParameters(Params, (*I)->getTemplateSpecializationArgs());
    807       Visit(*I);
    808     }
    809   }
    810 
    811   return VisitRedeclarableTemplateDecl(D);
    812 }
    813 
    814 void DeclPrinter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
    815   if (PrintInstantiation) {
    816     TemplateParameterList *Params = D->getTemplateParameters();
    817     for (ClassTemplateDecl::spec_iterator I = D->spec_begin(), E = D->spec_end();
    818          I != E; ++I) {
    819       PrintTemplateParameters(Params, &(*I)->getTemplateArgs());
    820       Visit(*I);
    821       Out << '\n';
    822     }
    823   }
    824 
    825   return VisitRedeclarableTemplateDecl(D);
    826 }
    827 
    828 //----------------------------------------------------------------------------
    829 // Objective-C declarations
    830 //----------------------------------------------------------------------------
    831 
    832 void DeclPrinter::VisitObjCClassDecl(ObjCClassDecl *D) {
    833   Out << "@class " << *D->getForwardInterfaceDecl();
    834 }
    835 
    836 void DeclPrinter::VisitObjCMethodDecl(ObjCMethodDecl *OMD) {
    837   if (OMD->isInstanceMethod())
    838     Out << "- ";
    839   else
    840     Out << "+ ";
    841   if (!OMD->getResultType().isNull())
    842     Out << '(' << OMD->getResultType().getAsString(Policy) << ")";
    843 
    844   std::string name = OMD->getSelector().getAsString();
    845   std::string::size_type pos, lastPos = 0;
    846   for (ObjCMethodDecl::param_iterator PI = OMD->param_begin(),
    847        E = OMD->param_end(); PI != E; ++PI) {
    848     // FIXME: selector is missing here!
    849     pos = name.find_first_of(':', lastPos);
    850     Out << " " << name.substr(lastPos, pos - lastPos);
    851     Out << ":(" << (*PI)->getType().getAsString(Policy) << ')' << **PI;
    852     lastPos = pos + 1;
    853   }
    854 
    855   if (OMD->param_begin() == OMD->param_end())
    856     Out << " " << name;
    857 
    858   if (OMD->isVariadic())
    859       Out << ", ...";
    860 
    861   if (OMD->getBody()) {
    862     Out << ' ';
    863     OMD->getBody()->printPretty(Out, Context, 0, Policy);
    864     Out << '\n';
    865   }
    866 }
    867 
    868 void DeclPrinter::VisitObjCImplementationDecl(ObjCImplementationDecl *OID) {
    869   std::string I = OID->getNameAsString();
    870   ObjCInterfaceDecl *SID = OID->getSuperClass();
    871 
    872   if (SID)
    873     Out << "@implementation " << I << " : " << *SID;
    874   else
    875     Out << "@implementation " << I;
    876   Out << "\n";
    877   VisitDeclContext(OID, false);
    878   Out << "@end";
    879 }
    880 
    881 void DeclPrinter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *OID) {
    882   std::string I = OID->getNameAsString();
    883   ObjCInterfaceDecl *SID = OID->getSuperClass();
    884 
    885   if (SID)
    886     Out << "@interface " << I << " : " << *SID;
    887   else
    888     Out << "@interface " << I;
    889 
    890   // Protocols?
    891   const ObjCList<ObjCProtocolDecl> &Protocols = OID->getReferencedProtocols();
    892   if (!Protocols.empty()) {
    893     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
    894          E = Protocols.end(); I != E; ++I)
    895       Out << (I == Protocols.begin() ? '<' : ',') << **I;
    896   }
    897 
    898   if (!Protocols.empty())
    899     Out << "> ";
    900 
    901   if (OID->ivar_size() > 0) {
    902     Out << "{\n";
    903     Indentation += Policy.Indentation;
    904     for (ObjCInterfaceDecl::ivar_iterator I = OID->ivar_begin(),
    905          E = OID->ivar_end(); I != E; ++I) {
    906       Indent() << (*I)->getType().getAsString(Policy) << ' ' << **I << ";\n";
    907     }
    908     Indentation -= Policy.Indentation;
    909     Out << "}\n";
    910   }
    911 
    912   VisitDeclContext(OID, false);
    913   Out << "@end";
    914   // FIXME: implement the rest...
    915 }
    916 
    917 void DeclPrinter::VisitObjCForwardProtocolDecl(ObjCForwardProtocolDecl *D) {
    918   Out << "@protocol ";
    919   for (ObjCForwardProtocolDecl::protocol_iterator I = D->protocol_begin(),
    920          E = D->protocol_end();
    921        I != E; ++I) {
    922     if (I != D->protocol_begin()) Out << ", ";
    923     Out << **I;
    924   }
    925 }
    926 
    927 void DeclPrinter::VisitObjCProtocolDecl(ObjCProtocolDecl *PID) {
    928   Out << "@protocol " << *PID << '\n';
    929   VisitDeclContext(PID, false);
    930   Out << "@end";
    931 }
    932 
    933 void DeclPrinter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *PID) {
    934   Out << "@implementation " << *PID->getClassInterface() << '(' << *PID <<")\n";
    935 
    936   VisitDeclContext(PID, false);
    937   Out << "@end";
    938   // FIXME: implement the rest...
    939 }
    940 
    941 void DeclPrinter::VisitObjCCategoryDecl(ObjCCategoryDecl *PID) {
    942   Out << "@interface " << *PID->getClassInterface() << '(' << *PID << ")\n";
    943   VisitDeclContext(PID, false);
    944   Out << "@end";
    945 
    946   // FIXME: implement the rest...
    947 }
    948 
    949 void DeclPrinter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *AID) {
    950   Out << "@compatibility_alias " << *AID
    951       << ' ' << *AID->getClassInterface() << ";\n";
    952 }
    953 
    954 /// PrintObjCPropertyDecl - print a property declaration.
    955 ///
    956 void DeclPrinter::VisitObjCPropertyDecl(ObjCPropertyDecl *PDecl) {
    957   if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Required)
    958     Out << "@required\n";
    959   else if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Optional)
    960     Out << "@optional\n";
    961 
    962   Out << "@property";
    963   if (PDecl->getPropertyAttributes() != ObjCPropertyDecl::OBJC_PR_noattr) {
    964     bool first = true;
    965     Out << " (";
    966     if (PDecl->getPropertyAttributes() &
    967         ObjCPropertyDecl::OBJC_PR_readonly) {
    968       Out << (first ? ' ' : ',') << "readonly";
    969       first = false;
    970     }
    971 
    972     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) {
    973       Out << (first ? ' ' : ',') << "getter = "
    974           << PDecl->getGetterName().getAsString();
    975       first = false;
    976     }
    977     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) {
    978       Out << (first ? ' ' : ',') << "setter = "
    979           << PDecl->getSetterName().getAsString();
    980       first = false;
    981     }
    982 
    983     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_assign) {
    984       Out << (first ? ' ' : ',') << "assign";
    985       first = false;
    986     }
    987 
    988     if (PDecl->getPropertyAttributes() &
    989         ObjCPropertyDecl::OBJC_PR_readwrite) {
    990       Out << (first ? ' ' : ',') << "readwrite";
    991       first = false;
    992     }
    993 
    994     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_retain) {
    995       Out << (first ? ' ' : ',') << "retain";
    996       first = false;
    997     }
    998 
    999     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_strong) {
   1000       Out << (first ? ' ' : ',') << "strong";
   1001       first = false;
   1002     }
   1003 
   1004     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_copy) {
   1005       Out << (first ? ' ' : ',') << "copy";
   1006       first = false;
   1007     }
   1008 
   1009     if (PDecl->getPropertyAttributes() &
   1010         ObjCPropertyDecl::OBJC_PR_nonatomic) {
   1011       Out << (first ? ' ' : ',') << "nonatomic";
   1012       first = false;
   1013     }
   1014     if (PDecl->getPropertyAttributes() &
   1015         ObjCPropertyDecl::OBJC_PR_atomic) {
   1016       Out << (first ? ' ' : ',') << "atomic";
   1017       first = false;
   1018     }
   1019 
   1020     (void) first; // Silence dead store warning due to idiomatic code.
   1021     Out << " )";
   1022   }
   1023   Out << ' ' << PDecl->getType().getAsString(Policy) << ' ' << *PDecl;
   1024 }
   1025 
   1026 void DeclPrinter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *PID) {
   1027   if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize)
   1028     Out << "@synthesize ";
   1029   else
   1030     Out << "@dynamic ";
   1031   Out << *PID->getPropertyDecl();
   1032   if (PID->getPropertyIvarDecl())
   1033     Out << '=' << *PID->getPropertyIvarDecl();
   1034 }
   1035 
   1036 void DeclPrinter::VisitUsingDecl(UsingDecl *D) {
   1037   Out << "using ";
   1038   D->getQualifier()->print(Out, Policy);
   1039   Out << *D;
   1040 }
   1041 
   1042 void
   1043 DeclPrinter::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) {
   1044   Out << "using typename ";
   1045   D->getQualifier()->print(Out, Policy);
   1046   Out << D->getDeclName();
   1047 }
   1048 
   1049 void DeclPrinter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
   1050   Out << "using ";
   1051   D->getQualifier()->print(Out, Policy);
   1052   Out << D->getDeclName();
   1053 }
   1054 
   1055 void DeclPrinter::VisitUsingShadowDecl(UsingShadowDecl *D) {
   1056   // ignore
   1057 }
   1058