1 //===--- DeclPrinter.cpp - Printing implementation for Decl ASTs ----------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the Decl::print method, which pretty prints the
11 // AST back out to C/Objective-C/C++/Objective-C++ code.
12 //
13 //===----------------------------------------------------------------------===//
14 #include "clang/AST/ASTContext.h"
15 #include "clang/AST/Attr.h"
16 #include "clang/AST/Decl.h"
17 #include "clang/AST/DeclCXX.h"
18 #include "clang/AST/DeclObjC.h"
19 #include "clang/AST/DeclVisitor.h"
20 #include "clang/AST/Expr.h"
21 #include "clang/AST/ExprCXX.h"
22 #include "clang/AST/PrettyPrinter.h"
23 #include "clang/Basic/Module.h"
24 #include "llvm/Support/raw_ostream.h"
25 using namespace clang;
26 
27 namespace {
28   class DeclPrinter : public DeclVisitor<DeclPrinter> {
29     raw_ostream &Out;
30     PrintingPolicy Policy;
31     const ASTContext &Context;
32     unsigned Indentation;
33     bool PrintInstantiation;
34 
35     raw_ostream& Indent() { return Indent(Indentation); }
36     raw_ostream& Indent(unsigned Indentation);
37     void ProcessDeclGroup(SmallVectorImpl<Decl*>& Decls);
38 
39     void Print(AccessSpecifier AS);
40     void PrintConstructorInitializers(CXXConstructorDecl *CDecl,
41                                       std::string &Proto);
42 
43     /// Print an Objective-C method type in parentheses.
44     ///
45     /// \param Quals The Objective-C declaration qualifiers.
46     /// \param T The type to print.
47     void PrintObjCMethodType(ASTContext &Ctx, Decl::ObjCDeclQualifier Quals,
48                              QualType T);
49 
50     void PrintObjCTypeParams(ObjCTypeParamList *Params);
51 
52   public:
53     DeclPrinter(raw_ostream &Out, const PrintingPolicy &Policy,
54                 const ASTContext &Context, unsigned Indentation = 0,
55                 bool PrintInstantiation = false)
56         : Out(Out), Policy(Policy), Context(Context), Indentation(Indentation),
57           PrintInstantiation(PrintInstantiation) {}
58 
59     void VisitDeclContext(DeclContext *DC, bool Indent = true);
60 
61     void VisitTranslationUnitDecl(TranslationUnitDecl *D);
62     void VisitTypedefDecl(TypedefDecl *D);
63     void VisitTypeAliasDecl(TypeAliasDecl *D);
64     void VisitEnumDecl(EnumDecl *D);
65     void VisitRecordDecl(RecordDecl *D);
66     void VisitEnumConstantDecl(EnumConstantDecl *D);
67     void VisitEmptyDecl(EmptyDecl *D);
68     void VisitFunctionDecl(FunctionDecl *D);
69     void VisitFriendDecl(FriendDecl *D);
70     void VisitFieldDecl(FieldDecl *D);
71     void VisitVarDecl(VarDecl *D);
72     void VisitLabelDecl(LabelDecl *D);
73     void VisitParmVarDecl(ParmVarDecl *D);
74     void VisitFileScopeAsmDecl(FileScopeAsmDecl *D);
75     void VisitImportDecl(ImportDecl *D);
76     void VisitStaticAssertDecl(StaticAssertDecl *D);
77     void VisitNamespaceDecl(NamespaceDecl *D);
78     void VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
79     void VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
80     void VisitCXXRecordDecl(CXXRecordDecl *D);
81     void VisitLinkageSpecDecl(LinkageSpecDecl *D);
82     void VisitTemplateDecl(const TemplateDecl *D);
83     void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
84     void VisitClassTemplateDecl(ClassTemplateDecl *D);
85     void VisitClassTemplateSpecializationDecl(
86                                             ClassTemplateSpecializationDecl *D);
87     void VisitClassTemplatePartialSpecializationDecl(
88                                      ClassTemplatePartialSpecializationDecl *D);
89     void VisitObjCMethodDecl(ObjCMethodDecl *D);
90     void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
91     void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
92     void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
93     void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
94     void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
95     void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
96     void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
97     void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
98     void VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
99     void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
100     void VisitUsingDecl(UsingDecl *D);
101     void VisitUsingShadowDecl(UsingShadowDecl *D);
102     void VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D);
103     void VisitOMPRequiresDecl(OMPRequiresDecl *D);
104     void VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D);
105     void VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D);
106 
107     void printTemplateParameters(const TemplateParameterList *Params);
108     void printTemplateArguments(const TemplateArgumentList &Args,
109                                 const TemplateParameterList *Params = nullptr);
110     void prettyPrintAttributes(Decl *D);
111     void prettyPrintPragmas(Decl *D);
112     void printDeclType(QualType T, StringRef DeclName, bool Pack = false);
113   };
114 }
115 
116 void Decl::print(raw_ostream &Out, unsigned Indentation,
117                  bool PrintInstantiation) const {
118   print(Out, getASTContext().getPrintingPolicy(), Indentation, PrintInstantiation);
119 }
120 
121 void Decl::print(raw_ostream &Out, const PrintingPolicy &Policy,
122                  unsigned Indentation, bool PrintInstantiation) const {
123   DeclPrinter Printer(Out, Policy, getASTContext(), Indentation,
124                       PrintInstantiation);
125   Printer.Visit(const_cast<Decl*>(this));
126 }
127 
128 static QualType GetBaseType(QualType T) {
129   // FIXME: This should be on the Type class!
130   QualType BaseType = T;
131   while (!BaseType->isSpecifierType()) {
132     if (const PointerType *PTy = BaseType->getAs<PointerType>())
133       BaseType = PTy->getPointeeType();
134     else if (const BlockPointerType *BPy = BaseType->getAs<BlockPointerType>())
135       BaseType = BPy->getPointeeType();
136     else if (const ArrayType* ATy = dyn_cast<ArrayType>(BaseType))
137       BaseType = ATy->getElementType();
138     else if (const FunctionType* FTy = BaseType->getAs<FunctionType>())
139       BaseType = FTy->getReturnType();
140     else if (const VectorType *VTy = BaseType->getAs<VectorType>())
141       BaseType = VTy->getElementType();
142     else if (const ReferenceType *RTy = BaseType->getAs<ReferenceType>())
143       BaseType = RTy->getPointeeType();
144     else if (const AutoType *ATy = BaseType->getAs<AutoType>())
145       BaseType = ATy->getDeducedType();
146     else if (const ParenType *PTy = BaseType->getAs<ParenType>())
147       BaseType = PTy->desugar();
148     else
149       // This must be a syntax error.
150       break;
151   }
152   return BaseType;
153 }
154 
155 static QualType getDeclType(Decl* D) {
156   if (TypedefNameDecl* TDD = dyn_cast<TypedefNameDecl>(D))
157     return TDD->getUnderlyingType();
158   if (ValueDecl* VD = dyn_cast<ValueDecl>(D))
159     return VD->getType();
160   return QualType();
161 }
162 
163 void Decl::printGroup(Decl** Begin, unsigned NumDecls,
164                       raw_ostream &Out, const PrintingPolicy &Policy,
165                       unsigned Indentation) {
166   if (NumDecls == 1) {
167     (*Begin)->print(Out, Policy, Indentation);
168     return;
169   }
170 
171   Decl** End = Begin + NumDecls;
172   TagDecl* TD = dyn_cast<TagDecl>(*Begin);
173   if (TD)
174     ++Begin;
175 
176   PrintingPolicy SubPolicy(Policy);
177 
178   bool isFirst = true;
179   for ( ; Begin != End; ++Begin) {
180     if (isFirst) {
181       if(TD)
182         SubPolicy.IncludeTagDefinition = true;
183       SubPolicy.SuppressSpecifiers = false;
184       isFirst = false;
185     } else {
186       if (!isFirst) Out << ", ";
187       SubPolicy.IncludeTagDefinition = false;
188       SubPolicy.SuppressSpecifiers = true;
189     }
190 
191     (*Begin)->print(Out, SubPolicy, Indentation);
192   }
193 }
194 
195 LLVM_DUMP_METHOD void DeclContext::dumpDeclContext() const {
196   // Get the translation unit
197   const DeclContext *DC = this;
198   while (!DC->isTranslationUnit())
199     DC = DC->getParent();
200 
201   ASTContext &Ctx = cast<TranslationUnitDecl>(DC)->getASTContext();
202   DeclPrinter Printer(llvm::errs(), Ctx.getPrintingPolicy(), Ctx, 0);
203   Printer.VisitDeclContext(const_cast<DeclContext *>(this), /*Indent=*/false);
204 }
205 
206 raw_ostream& DeclPrinter::Indent(unsigned Indentation) {
207   for (unsigned i = 0; i != Indentation; ++i)
208     Out << "  ";
209   return Out;
210 }
211 
212 void DeclPrinter::prettyPrintAttributes(Decl *D) {
213   if (Policy.PolishForDeclaration)
214     return;
215 
216   if (D->hasAttrs()) {
217     AttrVec &Attrs = D->getAttrs();
218     for (auto *A : Attrs) {
219       if (A->isInherited() || A->isImplicit())
220         continue;
221       switch (A->getKind()) {
222 #define ATTR(X)
223 #define PRAGMA_SPELLING_ATTR(X) case attr::X:
224 #include "clang/Basic/AttrList.inc"
225         break;
226       default:
227         A->printPretty(Out, Policy);
228         break;
229       }
230     }
231   }
232 }
233 
234 void DeclPrinter::prettyPrintPragmas(Decl *D) {
235   if (Policy.PolishForDeclaration)
236     return;
237 
238   if (D->hasAttrs()) {
239     AttrVec &Attrs = D->getAttrs();
240     for (auto *A : Attrs) {
241       switch (A->getKind()) {
242 #define ATTR(X)
243 #define PRAGMA_SPELLING_ATTR(X) case attr::X:
244 #include "clang/Basic/AttrList.inc"
245         A->printPretty(Out, Policy);
246         Indent();
247         break;
248       default:
249         break;
250       }
251     }
252   }
253 }
254 
255 void DeclPrinter::printDeclType(QualType T, StringRef DeclName, bool Pack) {
256   // Normally, a PackExpansionType is written as T[3]... (for instance, as a
257   // template argument), but if it is the type of a declaration, the ellipsis
258   // is placed before the name being declared.
259   if (auto *PET = T->getAs<PackExpansionType>()) {
260     Pack = true;
261     T = PET->getPattern();
262   }
263   T.print(Out, Policy, (Pack ? "..." : "") + DeclName, Indentation);
264 }
265 
266 void DeclPrinter::ProcessDeclGroup(SmallVectorImpl<Decl*>& Decls) {
267   this->Indent();
268   Decl::printGroup(Decls.data(), Decls.size(), Out, Policy, Indentation);
269   Out << ";\n";
270   Decls.clear();
271 
272 }
273 
274 void DeclPrinter::Print(AccessSpecifier AS) {
275   switch(AS) {
276   case AS_none:      llvm_unreachable("No access specifier!");
277   case AS_public:    Out << "public"; break;
278   case AS_protected: Out << "protected"; break;
279   case AS_private:   Out << "private"; break;
280   }
281 }
282 
283 void DeclPrinter::PrintConstructorInitializers(CXXConstructorDecl *CDecl,
284                                                std::string &Proto) {
285   bool HasInitializerList = false;
286   for (const auto *BMInitializer : CDecl->inits()) {
287     if (BMInitializer->isInClassMemberInitializer())
288       continue;
289 
290     if (!HasInitializerList) {
291       Proto += " : ";
292       Out << Proto;
293       Proto.clear();
294       HasInitializerList = true;
295     } else
296       Out << ", ";
297 
298     if (BMInitializer->isAnyMemberInitializer()) {
299       FieldDecl *FD = BMInitializer->getAnyMember();
300       Out << *FD;
301     } else {
302       Out << QualType(BMInitializer->getBaseClass(), 0).getAsString(Policy);
303     }
304 
305     Out << "(";
306     if (!BMInitializer->getInit()) {
307       // Nothing to print
308     } else {
309       Expr *Init = BMInitializer->getInit();
310       if (ExprWithCleanups *Tmp = dyn_cast<ExprWithCleanups>(Init))
311         Init = Tmp->getSubExpr();
312 
313       Init = Init->IgnoreParens();
314 
315       Expr *SimpleInit = nullptr;
316       Expr **Args = nullptr;
317       unsigned NumArgs = 0;
318       if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
319         Args = ParenList->getExprs();
320         NumArgs = ParenList->getNumExprs();
321       } else if (CXXConstructExpr *Construct =
322                      dyn_cast<CXXConstructExpr>(Init)) {
323         Args = Construct->getArgs();
324         NumArgs = Construct->getNumArgs();
325       } else
326         SimpleInit = Init;
327 
328       if (SimpleInit)
329         SimpleInit->printPretty(Out, nullptr, Policy, Indentation);
330       else {
331         for (unsigned I = 0; I != NumArgs; ++I) {
332           assert(Args[I] != nullptr && "Expected non-null Expr");
333           if (isa<CXXDefaultArgExpr>(Args[I]))
334             break;
335 
336           if (I)
337             Out << ", ";
338           Args[I]->printPretty(Out, nullptr, Policy, Indentation);
339         }
340       }
341     }
342     Out << ")";
343     if (BMInitializer->isPackExpansion())
344       Out << "...";
345   }
346 }
347 
348 //----------------------------------------------------------------------------
349 // Common C declarations
350 //----------------------------------------------------------------------------
351 
352 void DeclPrinter::VisitDeclContext(DeclContext *DC, bool Indent) {
353   if (Policy.TerseOutput)
354     return;
355 
356   if (Indent)
357     Indentation += Policy.Indentation;
358 
359   SmallVector<Decl*, 2> Decls;
360   for (DeclContext::decl_iterator D = DC->decls_begin(), DEnd = DC->decls_end();
361        D != DEnd; ++D) {
362 
363     // Don't print ObjCIvarDecls, as they are printed when visiting the
364     // containing ObjCInterfaceDecl.
365     if (isa<ObjCIvarDecl>(*D))
366       continue;
367 
368     // Skip over implicit declarations in pretty-printing mode.
369     if (D->isImplicit())
370       continue;
371 
372     // Don't print implicit specializations, as they are printed when visiting
373     // corresponding templates.
374     if (auto FD = dyn_cast<FunctionDecl>(*D))
375       if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation &&
376           !isa<ClassTemplateSpecializationDecl>(DC))
377         continue;
378 
379     // The next bits of code handle stuff like "struct {int x;} a,b"; we're
380     // forced to merge the declarations because there's no other way to
381     // refer to the struct in question.  When that struct is named instead, we
382     // also need to merge to avoid splitting off a stand-alone struct
383     // declaration that produces the warning ext_no_declarators in some
384     // contexts.
385     //
386     // This limited merging is safe without a bunch of other checks because it
387     // only merges declarations directly referring to the tag, not typedefs.
388     //
389     // Check whether the current declaration should be grouped with a previous
390     // non-free-standing tag declaration.
391     QualType CurDeclType = getDeclType(*D);
392     if (!Decls.empty() && !CurDeclType.isNull()) {
393       QualType BaseType = GetBaseType(CurDeclType);
394       if (!BaseType.isNull() && isa<ElaboratedType>(BaseType) &&
395           cast<ElaboratedType>(BaseType)->getOwnedTagDecl() == Decls[0]) {
396         Decls.push_back(*D);
397         continue;
398       }
399     }
400 
401     // If we have a merged group waiting to be handled, handle it now.
402     if (!Decls.empty())
403       ProcessDeclGroup(Decls);
404 
405     // If the current declaration is not a free standing declaration, save it
406     // so we can merge it with the subsequent declaration(s) using it.
407     if (isa<TagDecl>(*D) && !cast<TagDecl>(*D)->isFreeStanding()) {
408       Decls.push_back(*D);
409       continue;
410     }
411 
412     if (isa<AccessSpecDecl>(*D)) {
413       Indentation -= Policy.Indentation;
414       this->Indent();
415       Print(D->getAccess());
416       Out << ":\n";
417       Indentation += Policy.Indentation;
418       continue;
419     }
420 
421     this->Indent();
422     Visit(*D);
423 
424     // FIXME: Need to be able to tell the DeclPrinter when
425     const char *Terminator = nullptr;
426     if (isa<OMPThreadPrivateDecl>(*D) || isa<OMPDeclareReductionDecl>(*D) ||
427         isa<OMPRequiresDecl>(*D))
428       Terminator = nullptr;
429     else if (isa<ObjCMethodDecl>(*D) && cast<ObjCMethodDecl>(*D)->hasBody())
430       Terminator = nullptr;
431     else if (auto FD = dyn_cast<FunctionDecl>(*D)) {
432       if (FD->isThisDeclarationADefinition())
433         Terminator = nullptr;
434       else
435         Terminator = ";";
436     } else if (auto TD = dyn_cast<FunctionTemplateDecl>(*D)) {
437       if (TD->getTemplatedDecl()->isThisDeclarationADefinition())
438         Terminator = nullptr;
439       else
440         Terminator = ";";
441     } else if (isa<NamespaceDecl>(*D) || isa<LinkageSpecDecl>(*D) ||
442              isa<ObjCImplementationDecl>(*D) ||
443              isa<ObjCInterfaceDecl>(*D) ||
444              isa<ObjCProtocolDecl>(*D) ||
445              isa<ObjCCategoryImplDecl>(*D) ||
446              isa<ObjCCategoryDecl>(*D))
447       Terminator = nullptr;
448     else if (isa<EnumConstantDecl>(*D)) {
449       DeclContext::decl_iterator Next = D;
450       ++Next;
451       if (Next != DEnd)
452         Terminator = ",";
453     } else
454       Terminator = ";";
455 
456     if (Terminator)
457       Out << Terminator;
458     if (!Policy.TerseOutput &&
459         ((isa<FunctionDecl>(*D) &&
460           cast<FunctionDecl>(*D)->doesThisDeclarationHaveABody()) ||
461          (isa<FunctionTemplateDecl>(*D) &&
462           cast<FunctionTemplateDecl>(*D)->getTemplatedDecl()->doesThisDeclarationHaveABody())))
463       ; // StmtPrinter already added '\n' after CompoundStmt.
464     else
465       Out << "\n";
466 
467     // Declare target attribute is special one, natural spelling for the pragma
468     // assumes "ending" construct so print it here.
469     if (D->hasAttr<OMPDeclareTargetDeclAttr>())
470       Out << "#pragma omp end declare target\n";
471   }
472 
473   if (!Decls.empty())
474     ProcessDeclGroup(Decls);
475 
476   if (Indent)
477     Indentation -= Policy.Indentation;
478 }
479 
480 void DeclPrinter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
481   VisitDeclContext(D, false);
482 }
483 
484 void DeclPrinter::VisitTypedefDecl(TypedefDecl *D) {
485   if (!Policy.SuppressSpecifiers) {
486     Out << "typedef ";
487 
488     if (D->isModulePrivate())
489       Out << "__module_private__ ";
490   }
491   QualType Ty = D->getTypeSourceInfo()->getType();
492   Ty.print(Out, Policy, D->getName(), Indentation);
493   prettyPrintAttributes(D);
494 }
495 
496 void DeclPrinter::VisitTypeAliasDecl(TypeAliasDecl *D) {
497   Out << "using " << *D;
498   prettyPrintAttributes(D);
499   Out << " = " << D->getTypeSourceInfo()->getType().getAsString(Policy);
500 }
501 
502 void DeclPrinter::VisitEnumDecl(EnumDecl *D) {
503   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
504     Out << "__module_private__ ";
505   Out << "enum";
506   if (D->isScoped()) {
507     if (D->isScopedUsingClassTag())
508       Out << " class";
509     else
510       Out << " struct";
511   }
512 
513   prettyPrintAttributes(D);
514 
515   Out << ' ' << *D;
516 
517   if (D->isFixed() && D->getASTContext().getLangOpts().CPlusPlus11)
518     Out << " : " << D->getIntegerType().stream(Policy);
519 
520   if (D->isCompleteDefinition()) {
521     Out << " {\n";
522     VisitDeclContext(D);
523     Indent() << "}";
524   }
525 }
526 
527 void DeclPrinter::VisitRecordDecl(RecordDecl *D) {
528   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
529     Out << "__module_private__ ";
530   Out << D->getKindName();
531 
532   prettyPrintAttributes(D);
533 
534   if (D->getIdentifier())
535     Out << ' ' << *D;
536 
537   if (D->isCompleteDefinition()) {
538     Out << " {\n";
539     VisitDeclContext(D);
540     Indent() << "}";
541   }
542 }
543 
544 void DeclPrinter::VisitEnumConstantDecl(EnumConstantDecl *D) {
545   Out << *D;
546   prettyPrintAttributes(D);
547   if (Expr *Init = D->getInitExpr()) {
548     Out << " = ";
549     Init->printPretty(Out, nullptr, Policy, Indentation, "\n", &Context);
550   }
551 }
552 
553 void DeclPrinter::VisitFunctionDecl(FunctionDecl *D) {
554   if (!D->getDescribedFunctionTemplate() &&
555       !D->isFunctionTemplateSpecialization())
556     prettyPrintPragmas(D);
557 
558   if (D->isFunctionTemplateSpecialization())
559     Out << "template<> ";
560   else if (!D->getDescribedFunctionTemplate()) {
561     for (unsigned I = 0, NumTemplateParams = D->getNumTemplateParameterLists();
562          I < NumTemplateParams; ++I)
563       printTemplateParameters(D->getTemplateParameterList(I));
564   }
565 
566   CXXConstructorDecl *CDecl = dyn_cast<CXXConstructorDecl>(D);
567   CXXConversionDecl *ConversionDecl = dyn_cast<CXXConversionDecl>(D);
568   CXXDeductionGuideDecl *GuideDecl = dyn_cast<CXXDeductionGuideDecl>(D);
569   if (!Policy.SuppressSpecifiers) {
570     switch (D->getStorageClass()) {
571     case SC_None: break;
572     case SC_Extern: Out << "extern "; break;
573     case SC_Static: Out << "static "; break;
574     case SC_PrivateExtern: Out << "__private_extern__ "; break;
575     case SC_Auto: case SC_Register:
576       llvm_unreachable("invalid for functions");
577     }
578 
579     if (D->isInlineSpecified())  Out << "inline ";
580     if (D->isVirtualAsWritten()) Out << "virtual ";
581     if (D->isModulePrivate())    Out << "__module_private__ ";
582     if (D->isConstexpr() && !D->isExplicitlyDefaulted()) Out << "constexpr ";
583     if ((CDecl && CDecl->isExplicitSpecified()) ||
584         (ConversionDecl && ConversionDecl->isExplicitSpecified()) ||
585         (GuideDecl && GuideDecl->isExplicitSpecified()))
586       Out << "explicit ";
587   }
588 
589   PrintingPolicy SubPolicy(Policy);
590   SubPolicy.SuppressSpecifiers = false;
591   std::string Proto;
592 
593   if (Policy.FullyQualifiedName) {
594     Proto += D->getQualifiedNameAsString();
595   } else {
596     if (!Policy.SuppressScope) {
597       if (const NestedNameSpecifier *NS = D->getQualifier()) {
598         llvm::raw_string_ostream OS(Proto);
599         NS->print(OS, Policy);
600       }
601     }
602     Proto += D->getNameInfo().getAsString();
603   }
604 
605   if (GuideDecl)
606     Proto = GuideDecl->getDeducedTemplate()->getDeclName().getAsString();
607   if (const TemplateArgumentList *TArgs = D->getTemplateSpecializationArgs()) {
608     llvm::raw_string_ostream POut(Proto);
609     DeclPrinter TArgPrinter(POut, SubPolicy, Context, Indentation);
610     TArgPrinter.printTemplateArguments(*TArgs);
611   }
612 
613   QualType Ty = D->getType();
614   while (const ParenType *PT = dyn_cast<ParenType>(Ty)) {
615     Proto = '(' + Proto + ')';
616     Ty = PT->getInnerType();
617   }
618 
619   if (const FunctionType *AFT = Ty->getAs<FunctionType>()) {
620     const FunctionProtoType *FT = nullptr;
621     if (D->hasWrittenPrototype())
622       FT = dyn_cast<FunctionProtoType>(AFT);
623 
624     Proto += "(";
625     if (FT) {
626       llvm::raw_string_ostream POut(Proto);
627       DeclPrinter ParamPrinter(POut, SubPolicy, Context, Indentation);
628       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
629         if (i) POut << ", ";
630         ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
631       }
632 
633       if (FT->isVariadic()) {
634         if (D->getNumParams()) POut << ", ";
635         POut << "...";
636       }
637     } else if (D->doesThisDeclarationHaveABody() && !D->hasPrototype()) {
638       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
639         if (i)
640           Proto += ", ";
641         Proto += D->getParamDecl(i)->getNameAsString();
642       }
643     }
644 
645     Proto += ")";
646 
647     if (FT) {
648       if (FT->isConst())
649         Proto += " const";
650       if (FT->isVolatile())
651         Proto += " volatile";
652       if (FT->isRestrict())
653         Proto += " restrict";
654 
655       switch (FT->getRefQualifier()) {
656       case RQ_None:
657         break;
658       case RQ_LValue:
659         Proto += " &";
660         break;
661       case RQ_RValue:
662         Proto += " &&";
663         break;
664       }
665     }
666 
667     if (FT && FT->hasDynamicExceptionSpec()) {
668       Proto += " throw(";
669       if (FT->getExceptionSpecType() == EST_MSAny)
670         Proto += "...";
671       else
672         for (unsigned I = 0, N = FT->getNumExceptions(); I != N; ++I) {
673           if (I)
674             Proto += ", ";
675 
676           Proto += FT->getExceptionType(I).getAsString(SubPolicy);
677         }
678       Proto += ")";
679     } else if (FT && isNoexceptExceptionSpec(FT->getExceptionSpecType())) {
680       Proto += " noexcept";
681       if (isComputedNoexcept(FT->getExceptionSpecType())) {
682         Proto += "(";
683         llvm::raw_string_ostream EOut(Proto);
684         FT->getNoexceptExpr()->printPretty(EOut, nullptr, SubPolicy,
685                                            Indentation);
686         EOut.flush();
687         Proto += EOut.str();
688         Proto += ")";
689       }
690     }
691 
692     if (CDecl) {
693       if (!Policy.TerseOutput)
694         PrintConstructorInitializers(CDecl, Proto);
695     } else if (!ConversionDecl && !isa<CXXDestructorDecl>(D)) {
696       if (FT && FT->hasTrailingReturn()) {
697         if (!GuideDecl)
698           Out << "auto ";
699         Out << Proto << " -> ";
700         Proto.clear();
701       }
702       AFT->getReturnType().print(Out, Policy, Proto);
703       Proto.clear();
704     }
705     Out << Proto;
706   } else {
707     Ty.print(Out, Policy, Proto);
708   }
709 
710   prettyPrintAttributes(D);
711 
712   if (D->isPure())
713     Out << " = 0";
714   else if (D->isDeletedAsWritten())
715     Out << " = delete";
716   else if (D->isExplicitlyDefaulted())
717     Out << " = default";
718   else if (D->doesThisDeclarationHaveABody()) {
719     if (!Policy.TerseOutput) {
720       if (!D->hasPrototype() && D->getNumParams()) {
721         // This is a K&R function definition, so we need to print the
722         // parameters.
723         Out << '\n';
724         DeclPrinter ParamPrinter(Out, SubPolicy, Context, Indentation);
725         Indentation += Policy.Indentation;
726         for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
727           Indent();
728           ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
729           Out << ";\n";
730         }
731         Indentation -= Policy.Indentation;
732       } else
733         Out << ' ';
734 
735       if (D->getBody())
736         D->getBody()->printPretty(Out, nullptr, SubPolicy, Indentation);
737     } else {
738       if (!Policy.TerseOutput && isa<CXXConstructorDecl>(*D))
739         Out << " {}";
740     }
741   }
742 }
743 
744 void DeclPrinter::VisitFriendDecl(FriendDecl *D) {
745   if (TypeSourceInfo *TSI = D->getFriendType()) {
746     unsigned NumTPLists = D->getFriendTypeNumTemplateParameterLists();
747     for (unsigned i = 0; i < NumTPLists; ++i)
748       printTemplateParameters(D->getFriendTypeTemplateParameterList(i));
749     Out << "friend ";
750     Out << " " << TSI->getType().getAsString(Policy);
751   }
752   else if (FunctionDecl *FD =
753       dyn_cast<FunctionDecl>(D->getFriendDecl())) {
754     Out << "friend ";
755     VisitFunctionDecl(FD);
756   }
757   else if (FunctionTemplateDecl *FTD =
758            dyn_cast<FunctionTemplateDecl>(D->getFriendDecl())) {
759     Out << "friend ";
760     VisitFunctionTemplateDecl(FTD);
761   }
762   else if (ClassTemplateDecl *CTD =
763            dyn_cast<ClassTemplateDecl>(D->getFriendDecl())) {
764     Out << "friend ";
765     VisitRedeclarableTemplateDecl(CTD);
766   }
767 }
768 
769 void DeclPrinter::VisitFieldDecl(FieldDecl *D) {
770   // FIXME: add printing of pragma attributes if required.
771   if (!Policy.SuppressSpecifiers && D->isMutable())
772     Out << "mutable ";
773   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
774     Out << "__module_private__ ";
775 
776   Out << D->getASTContext().getUnqualifiedObjCPointerType(D->getType()).
777          stream(Policy, D->getName(), Indentation);
778 
779   if (D->isBitField()) {
780     Out << " : ";
781     D->getBitWidth()->printPretty(Out, nullptr, Policy, Indentation);
782   }
783 
784   Expr *Init = D->getInClassInitializer();
785   if (!Policy.SuppressInitializers && Init) {
786     if (D->getInClassInitStyle() == ICIS_ListInit)
787       Out << " ";
788     else
789       Out << " = ";
790     Init->printPretty(Out, nullptr, Policy, Indentation);
791   }
792   prettyPrintAttributes(D);
793 }
794 
795 void DeclPrinter::VisitLabelDecl(LabelDecl *D) {
796   Out << *D << ":";
797 }
798 
799 void DeclPrinter::VisitVarDecl(VarDecl *D) {
800   prettyPrintPragmas(D);
801 
802   QualType T = D->getTypeSourceInfo()
803     ? D->getTypeSourceInfo()->getType()
804     : D->getASTContext().getUnqualifiedObjCPointerType(D->getType());
805 
806   if (!Policy.SuppressSpecifiers) {
807     StorageClass SC = D->getStorageClass();
808     if (SC != SC_None)
809       Out << VarDecl::getStorageClassSpecifierString(SC) << " ";
810 
811     switch (D->getTSCSpec()) {
812     case TSCS_unspecified:
813       break;
814     case TSCS___thread:
815       Out << "__thread ";
816       break;
817     case TSCS__Thread_local:
818       Out << "_Thread_local ";
819       break;
820     case TSCS_thread_local:
821       Out << "thread_local ";
822       break;
823     }
824 
825     if (D->isModulePrivate())
826       Out << "__module_private__ ";
827 
828     if (D->isConstexpr()) {
829       Out << "constexpr ";
830       T.removeLocalConst();
831     }
832   }
833 
834   printDeclType(T, D->getName());
835   Expr *Init = D->getInit();
836   if (!Policy.SuppressInitializers && Init) {
837     bool ImplicitInit = false;
838     if (CXXConstructExpr *Construct =
839             dyn_cast<CXXConstructExpr>(Init->IgnoreImplicit())) {
840       if (D->getInitStyle() == VarDecl::CallInit &&
841           !Construct->isListInitialization()) {
842         ImplicitInit = Construct->getNumArgs() == 0 ||
843           Construct->getArg(0)->isDefaultArgument();
844       }
845     }
846     if (!ImplicitInit) {
847       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
848         Out << "(";
849       else if (D->getInitStyle() == VarDecl::CInit) {
850         Out << " = ";
851       }
852       PrintingPolicy SubPolicy(Policy);
853       SubPolicy.SuppressSpecifiers = false;
854       SubPolicy.IncludeTagDefinition = false;
855       Init->printPretty(Out, nullptr, SubPolicy, Indentation);
856       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
857         Out << ")";
858     }
859   }
860   prettyPrintAttributes(D);
861 }
862 
863 void DeclPrinter::VisitParmVarDecl(ParmVarDecl *D) {
864   VisitVarDecl(D);
865 }
866 
867 void DeclPrinter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
868   Out << "__asm (";
869   D->getAsmString()->printPretty(Out, nullptr, Policy, Indentation);
870   Out << ")";
871 }
872 
873 void DeclPrinter::VisitImportDecl(ImportDecl *D) {
874   Out << "@import " << D->getImportedModule()->getFullModuleName()
875       << ";\n";
876 }
877 
878 void DeclPrinter::VisitStaticAssertDecl(StaticAssertDecl *D) {
879   Out << "static_assert(";
880   D->getAssertExpr()->printPretty(Out, nullptr, Policy, Indentation);
881   if (StringLiteral *SL = D->getMessage()) {
882     Out << ", ";
883     SL->printPretty(Out, nullptr, Policy, Indentation);
884   }
885   Out << ")";
886 }
887 
888 //----------------------------------------------------------------------------
889 // C++ declarations
890 //----------------------------------------------------------------------------
891 void DeclPrinter::VisitNamespaceDecl(NamespaceDecl *D) {
892   if (D->isInline())
893     Out << "inline ";
894   Out << "namespace " << *D << " {\n";
895   VisitDeclContext(D);
896   Indent() << "}";
897 }
898 
899 void DeclPrinter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
900   Out << "using namespace ";
901   if (D->getQualifier())
902     D->getQualifier()->print(Out, Policy);
903   Out << *D->getNominatedNamespaceAsWritten();
904 }
905 
906 void DeclPrinter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
907   Out << "namespace " << *D << " = ";
908   if (D->getQualifier())
909     D->getQualifier()->print(Out, Policy);
910   Out << *D->getAliasedNamespace();
911 }
912 
913 void DeclPrinter::VisitEmptyDecl(EmptyDecl *D) {
914   prettyPrintAttributes(D);
915 }
916 
917 void DeclPrinter::VisitCXXRecordDecl(CXXRecordDecl *D) {
918   // FIXME: add printing of pragma attributes if required.
919   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
920     Out << "__module_private__ ";
921   Out << D->getKindName();
922 
923   prettyPrintAttributes(D);
924 
925   if (D->getIdentifier()) {
926     Out << ' ' << *D;
927 
928     if (auto S = dyn_cast<ClassTemplatePartialSpecializationDecl>(D))
929       printTemplateArguments(S->getTemplateArgs(), S->getTemplateParameters());
930     else if (auto S = dyn_cast<ClassTemplateSpecializationDecl>(D))
931       printTemplateArguments(S->getTemplateArgs());
932   }
933 
934   if (D->isCompleteDefinition()) {
935     // Print the base classes
936     if (D->getNumBases()) {
937       Out << " : ";
938       for (CXXRecordDecl::base_class_iterator Base = D->bases_begin(),
939              BaseEnd = D->bases_end(); Base != BaseEnd; ++Base) {
940         if (Base != D->bases_begin())
941           Out << ", ";
942 
943         if (Base->isVirtual())
944           Out << "virtual ";
945 
946         AccessSpecifier AS = Base->getAccessSpecifierAsWritten();
947         if (AS != AS_none) {
948           Print(AS);
949           Out << " ";
950         }
951         Out << Base->getType().getAsString(Policy);
952 
953         if (Base->isPackExpansion())
954           Out << "...";
955       }
956     }
957 
958     // Print the class definition
959     // FIXME: Doesn't print access specifiers, e.g., "public:"
960     if (Policy.TerseOutput) {
961       Out << " {}";
962     } else {
963       Out << " {\n";
964       VisitDeclContext(D);
965       Indent() << "}";
966     }
967   }
968 }
969 
970 void DeclPrinter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
971   const char *l;
972   if (D->getLanguage() == LinkageSpecDecl::lang_c)
973     l = "C";
974   else {
975     assert(D->getLanguage() == LinkageSpecDecl::lang_cxx &&
976            "unknown language in linkage specification");
977     l = "C++";
978   }
979 
980   Out << "extern \"" << l << "\" ";
981   if (D->hasBraces()) {
982     Out << "{\n";
983     VisitDeclContext(D);
984     Indent() << "}";
985   } else
986     Visit(*D->decls_begin());
987 }
988 
989 void DeclPrinter::printTemplateParameters(const TemplateParameterList *Params) {
990   assert(Params);
991 
992   Out << "template <";
993 
994   for (unsigned i = 0, e = Params->size(); i != e; ++i) {
995     if (i != 0)
996       Out << ", ";
997 
998     const Decl *Param = Params->getParam(i);
999     if (auto TTP = dyn_cast<TemplateTypeParmDecl>(Param)) {
1000 
1001       if (TTP->wasDeclaredWithTypename())
1002         Out << "typename ";
1003       else
1004         Out << "class ";
1005 
1006       if (TTP->isParameterPack())
1007         Out << "...";
1008 
1009       Out << *TTP;
1010 
1011       if (TTP->hasDefaultArgument()) {
1012         Out << " = ";
1013         Out << TTP->getDefaultArgument().getAsString(Policy);
1014       };
1015     } else if (auto NTTP = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
1016       StringRef Name;
1017       if (IdentifierInfo *II = NTTP->getIdentifier())
1018         Name = II->getName();
1019       printDeclType(NTTP->getType(), Name, NTTP->isParameterPack());
1020 
1021       if (NTTP->hasDefaultArgument()) {
1022         Out << " = ";
1023         NTTP->getDefaultArgument()->printPretty(Out, nullptr, Policy,
1024                                                 Indentation);
1025       }
1026     } else if (auto TTPD = dyn_cast<TemplateTemplateParmDecl>(Param)) {
1027       VisitTemplateDecl(TTPD);
1028       // FIXME: print the default argument, if present.
1029     }
1030   }
1031 
1032   Out << "> ";
1033 }
1034 
1035 void DeclPrinter::printTemplateArguments(const TemplateArgumentList &Args,
1036                                          const TemplateParameterList *Params) {
1037   Out << "<";
1038   for (size_t I = 0, E = Args.size(); I < E; ++I) {
1039     const TemplateArgument &A = Args[I];
1040     if (I)
1041       Out << ", ";
1042     if (Params) {
1043       if (A.getKind() == TemplateArgument::Type)
1044         if (auto T = A.getAsType()->getAs<TemplateTypeParmType>()) {
1045           auto P = cast<TemplateTypeParmDecl>(Params->getParam(T->getIndex()));
1046           Out << *P;
1047           continue;
1048         }
1049       if (A.getKind() == TemplateArgument::Template) {
1050         if (auto T = A.getAsTemplate().getAsTemplateDecl())
1051           if (auto TD = dyn_cast<TemplateTemplateParmDecl>(T)) {
1052             auto P = cast<TemplateTemplateParmDecl>(
1053                                               Params->getParam(TD->getIndex()));
1054             Out << *P;
1055             continue;
1056           }
1057       }
1058       if (A.getKind() == TemplateArgument::Expression) {
1059         if (auto E = dyn_cast<DeclRefExpr>(A.getAsExpr()))
1060           if (auto N = dyn_cast<NonTypeTemplateParmDecl>(E->getDecl())) {
1061             auto P = cast<NonTypeTemplateParmDecl>(
1062                                                Params->getParam(N->getIndex()));
1063             Out << *P;
1064             continue;
1065           }
1066       }
1067     }
1068     A.print(Policy, Out);
1069   }
1070   Out << ">";
1071 }
1072 
1073 void DeclPrinter::VisitTemplateDecl(const TemplateDecl *D) {
1074   printTemplateParameters(D->getTemplateParameters());
1075 
1076   if (const TemplateTemplateParmDecl *TTP =
1077         dyn_cast<TemplateTemplateParmDecl>(D)) {
1078     Out << "class ";
1079     if (TTP->isParameterPack())
1080       Out << "...";
1081     Out << D->getName();
1082   } else {
1083     Visit(D->getTemplatedDecl());
1084   }
1085 }
1086 
1087 void DeclPrinter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1088   prettyPrintPragmas(D->getTemplatedDecl());
1089   // Print any leading template parameter lists.
1090   if (const FunctionDecl *FD = D->getTemplatedDecl()) {
1091     for (unsigned I = 0, NumTemplateParams = FD->getNumTemplateParameterLists();
1092          I < NumTemplateParams; ++I)
1093       printTemplateParameters(FD->getTemplateParameterList(I));
1094   }
1095   VisitRedeclarableTemplateDecl(D);
1096   // Declare target attribute is special one, natural spelling for the pragma
1097   // assumes "ending" construct so print it here.
1098   if (D->getTemplatedDecl()->hasAttr<OMPDeclareTargetDeclAttr>())
1099     Out << "#pragma omp end declare target\n";
1100 
1101   // Never print "instantiations" for deduction guides (they don't really
1102   // have them).
1103   if (PrintInstantiation &&
1104       !isa<CXXDeductionGuideDecl>(D->getTemplatedDecl())) {
1105     FunctionDecl *PrevDecl = D->getTemplatedDecl();
1106     const FunctionDecl *Def;
1107     if (PrevDecl->isDefined(Def) && Def != PrevDecl)
1108       return;
1109     for (auto *I : D->specializations())
1110       if (I->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) {
1111         if (!PrevDecl->isThisDeclarationADefinition())
1112           Out << ";\n";
1113         Indent();
1114         prettyPrintPragmas(I);
1115         Visit(I);
1116       }
1117   }
1118 }
1119 
1120 void DeclPrinter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1121   VisitRedeclarableTemplateDecl(D);
1122 
1123   if (PrintInstantiation) {
1124     for (auto *I : D->specializations())
1125       if (I->getSpecializationKind() == TSK_ImplicitInstantiation) {
1126         if (D->isThisDeclarationADefinition())
1127           Out << ";";
1128         Out << "\n";
1129         Visit(I);
1130       }
1131   }
1132 }
1133 
1134 void DeclPrinter::VisitClassTemplateSpecializationDecl(
1135                                            ClassTemplateSpecializationDecl *D) {
1136   Out << "template<> ";
1137   VisitCXXRecordDecl(D);
1138 }
1139 
1140 void DeclPrinter::VisitClassTemplatePartialSpecializationDecl(
1141                                     ClassTemplatePartialSpecializationDecl *D) {
1142   printTemplateParameters(D->getTemplateParameters());
1143   VisitCXXRecordDecl(D);
1144 }
1145 
1146 //----------------------------------------------------------------------------
1147 // Objective-C declarations
1148 //----------------------------------------------------------------------------
1149 
1150 void DeclPrinter::PrintObjCMethodType(ASTContext &Ctx,
1151                                       Decl::ObjCDeclQualifier Quals,
1152                                       QualType T) {
1153   Out << '(';
1154   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_In)
1155     Out << "in ";
1156   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Inout)
1157     Out << "inout ";
1158   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Out)
1159     Out << "out ";
1160   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Bycopy)
1161     Out << "bycopy ";
1162   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Byref)
1163     Out << "byref ";
1164   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Oneway)
1165     Out << "oneway ";
1166   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_CSNullability) {
1167     if (auto nullability = AttributedType::stripOuterNullability(T))
1168       Out << getNullabilitySpelling(*nullability, true) << ' ';
1169   }
1170 
1171   Out << Ctx.getUnqualifiedObjCPointerType(T).getAsString(Policy);
1172   Out << ')';
1173 }
1174 
1175 void DeclPrinter::PrintObjCTypeParams(ObjCTypeParamList *Params) {
1176   Out << "<";
1177   unsigned First = true;
1178   for (auto *Param : *Params) {
1179     if (First) {
1180       First = false;
1181     } else {
1182       Out << ", ";
1183     }
1184 
1185     switch (Param->getVariance()) {
1186     case ObjCTypeParamVariance::Invariant:
1187       break;
1188 
1189     case ObjCTypeParamVariance::Covariant:
1190       Out << "__covariant ";
1191       break;
1192 
1193     case ObjCTypeParamVariance::Contravariant:
1194       Out << "__contravariant ";
1195       break;
1196     }
1197 
1198     Out << Param->getDeclName().getAsString();
1199 
1200     if (Param->hasExplicitBound()) {
1201       Out << " : " << Param->getUnderlyingType().getAsString(Policy);
1202     }
1203   }
1204   Out << ">";
1205 }
1206 
1207 void DeclPrinter::VisitObjCMethodDecl(ObjCMethodDecl *OMD) {
1208   if (OMD->isInstanceMethod())
1209     Out << "- ";
1210   else
1211     Out << "+ ";
1212   if (!OMD->getReturnType().isNull()) {
1213     PrintObjCMethodType(OMD->getASTContext(), OMD->getObjCDeclQualifier(),
1214                         OMD->getReturnType());
1215   }
1216 
1217   std::string name = OMD->getSelector().getAsString();
1218   std::string::size_type pos, lastPos = 0;
1219   for (const auto *PI : OMD->parameters()) {
1220     // FIXME: selector is missing here!
1221     pos = name.find_first_of(':', lastPos);
1222     if (lastPos != 0)
1223       Out << " ";
1224     Out << name.substr(lastPos, pos - lastPos) << ':';
1225     PrintObjCMethodType(OMD->getASTContext(),
1226                         PI->getObjCDeclQualifier(),
1227                         PI->getType());
1228     Out << *PI;
1229     lastPos = pos + 1;
1230   }
1231 
1232   if (OMD->param_begin() == OMD->param_end())
1233     Out << name;
1234 
1235   if (OMD->isVariadic())
1236       Out << ", ...";
1237 
1238   prettyPrintAttributes(OMD);
1239 
1240   if (OMD->getBody() && !Policy.TerseOutput) {
1241     Out << ' ';
1242     OMD->getBody()->printPretty(Out, nullptr, Policy);
1243   }
1244   else if (Policy.PolishForDeclaration)
1245     Out << ';';
1246 }
1247 
1248 void DeclPrinter::VisitObjCImplementationDecl(ObjCImplementationDecl *OID) {
1249   std::string I = OID->getNameAsString();
1250   ObjCInterfaceDecl *SID = OID->getSuperClass();
1251 
1252   bool eolnOut = false;
1253   if (SID)
1254     Out << "@implementation " << I << " : " << *SID;
1255   else
1256     Out << "@implementation " << I;
1257 
1258   if (OID->ivar_size() > 0) {
1259     Out << "{\n";
1260     eolnOut = true;
1261     Indentation += Policy.Indentation;
1262     for (const auto *I : OID->ivars()) {
1263       Indent() << I->getASTContext().getUnqualifiedObjCPointerType(I->getType()).
1264                     getAsString(Policy) << ' ' << *I << ";\n";
1265     }
1266     Indentation -= Policy.Indentation;
1267     Out << "}\n";
1268   }
1269   else if (SID || (OID->decls_begin() != OID->decls_end())) {
1270     Out << "\n";
1271     eolnOut = true;
1272   }
1273   VisitDeclContext(OID, false);
1274   if (!eolnOut)
1275     Out << "\n";
1276   Out << "@end";
1277 }
1278 
1279 void DeclPrinter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *OID) {
1280   std::string I = OID->getNameAsString();
1281   ObjCInterfaceDecl *SID = OID->getSuperClass();
1282 
1283   if (!OID->isThisDeclarationADefinition()) {
1284     Out << "@class " << I;
1285 
1286     if (auto TypeParams = OID->getTypeParamListAsWritten()) {
1287       PrintObjCTypeParams(TypeParams);
1288     }
1289 
1290     Out << ";";
1291     return;
1292   }
1293   bool eolnOut = false;
1294   Out << "@interface " << I;
1295 
1296   if (auto TypeParams = OID->getTypeParamListAsWritten()) {
1297     PrintObjCTypeParams(TypeParams);
1298   }
1299 
1300   if (SID)
1301     Out << " : " << QualType(OID->getSuperClassType(), 0).getAsString(Policy);
1302 
1303   // Protocols?
1304   const ObjCList<ObjCProtocolDecl> &Protocols = OID->getReferencedProtocols();
1305   if (!Protocols.empty()) {
1306     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
1307          E = Protocols.end(); I != E; ++I)
1308       Out << (I == Protocols.begin() ? '<' : ',') << **I;
1309     Out << "> ";
1310   }
1311 
1312   if (OID->ivar_size() > 0) {
1313     Out << "{\n";
1314     eolnOut = true;
1315     Indentation += Policy.Indentation;
1316     for (const auto *I : OID->ivars()) {
1317       Indent() << I->getASTContext()
1318                       .getUnqualifiedObjCPointerType(I->getType())
1319                       .getAsString(Policy) << ' ' << *I << ";\n";
1320     }
1321     Indentation -= Policy.Indentation;
1322     Out << "}\n";
1323   }
1324   else if (SID || (OID->decls_begin() != OID->decls_end())) {
1325     Out << "\n";
1326     eolnOut = true;
1327   }
1328 
1329   VisitDeclContext(OID, false);
1330   if (!eolnOut)
1331     Out << "\n";
1332   Out << "@end";
1333   // FIXME: implement the rest...
1334 }
1335 
1336 void DeclPrinter::VisitObjCProtocolDecl(ObjCProtocolDecl *PID) {
1337   if (!PID->isThisDeclarationADefinition()) {
1338     Out << "@protocol " << *PID << ";\n";
1339     return;
1340   }
1341   // Protocols?
1342   const ObjCList<ObjCProtocolDecl> &Protocols = PID->getReferencedProtocols();
1343   if (!Protocols.empty()) {
1344     Out << "@protocol " << *PID;
1345     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
1346          E = Protocols.end(); I != E; ++I)
1347       Out << (I == Protocols.begin() ? '<' : ',') << **I;
1348     Out << ">\n";
1349   } else
1350     Out << "@protocol " << *PID << '\n';
1351   VisitDeclContext(PID, false);
1352   Out << "@end";
1353 }
1354 
1355 void DeclPrinter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *PID) {
1356   Out << "@implementation " << *PID->getClassInterface() << '(' << *PID <<")\n";
1357 
1358   VisitDeclContext(PID, false);
1359   Out << "@end";
1360   // FIXME: implement the rest...
1361 }
1362 
1363 void DeclPrinter::VisitObjCCategoryDecl(ObjCCategoryDecl *PID) {
1364   Out << "@interface " << *PID->getClassInterface();
1365   if (auto TypeParams = PID->getTypeParamList()) {
1366     PrintObjCTypeParams(TypeParams);
1367   }
1368   Out << "(" << *PID << ")\n";
1369   if (PID->ivar_size() > 0) {
1370     Out << "{\n";
1371     Indentation += Policy.Indentation;
1372     for (const auto *I : PID->ivars())
1373       Indent() << I->getASTContext().getUnqualifiedObjCPointerType(I->getType()).
1374                     getAsString(Policy) << ' ' << *I << ";\n";
1375     Indentation -= Policy.Indentation;
1376     Out << "}\n";
1377   }
1378 
1379   VisitDeclContext(PID, false);
1380   Out << "@end";
1381 
1382   // FIXME: implement the rest...
1383 }
1384 
1385 void DeclPrinter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *AID) {
1386   Out << "@compatibility_alias " << *AID
1387       << ' ' << *AID->getClassInterface() << ";\n";
1388 }
1389 
1390 /// PrintObjCPropertyDecl - print a property declaration.
1391 ///
1392 void DeclPrinter::VisitObjCPropertyDecl(ObjCPropertyDecl *PDecl) {
1393   if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Required)
1394     Out << "@required\n";
1395   else if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Optional)
1396     Out << "@optional\n";
1397 
1398   QualType T = PDecl->getType();
1399 
1400   Out << "@property";
1401   if (PDecl->getPropertyAttributes() != ObjCPropertyDecl::OBJC_PR_noattr) {
1402     bool first = true;
1403     Out << " (";
1404     if (PDecl->getPropertyAttributes() &
1405         ObjCPropertyDecl::OBJC_PR_readonly) {
1406       Out << (first ? ' ' : ',') << "readonly";
1407       first = false;
1408     }
1409 
1410     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) {
1411       Out << (first ? ' ' : ',') << "getter = ";
1412       PDecl->getGetterName().print(Out);
1413       first = false;
1414     }
1415     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) {
1416       Out << (first ? ' ' : ',') << "setter = ";
1417       PDecl->getSetterName().print(Out);
1418       first = false;
1419     }
1420 
1421     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_assign) {
1422       Out << (first ? ' ' : ',') << "assign";
1423       first = false;
1424     }
1425 
1426     if (PDecl->getPropertyAttributes() &
1427         ObjCPropertyDecl::OBJC_PR_readwrite) {
1428       Out << (first ? ' ' : ',') << "readwrite";
1429       first = false;
1430     }
1431 
1432     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_retain) {
1433       Out << (first ? ' ' : ',') << "retain";
1434       first = false;
1435     }
1436 
1437     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_strong) {
1438       Out << (first ? ' ' : ',') << "strong";
1439       first = false;
1440     }
1441 
1442     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_copy) {
1443       Out << (first ? ' ' : ',') << "copy";
1444       first = false;
1445     }
1446 
1447     if (PDecl->getPropertyAttributes() &
1448         ObjCPropertyDecl::OBJC_PR_nonatomic) {
1449       Out << (first ? ' ' : ',') << "nonatomic";
1450       first = false;
1451     }
1452     if (PDecl->getPropertyAttributes() &
1453         ObjCPropertyDecl::OBJC_PR_atomic) {
1454       Out << (first ? ' ' : ',') << "atomic";
1455       first = false;
1456     }
1457 
1458     if (PDecl->getPropertyAttributes() &
1459         ObjCPropertyDecl::OBJC_PR_nullability) {
1460       if (auto nullability = AttributedType::stripOuterNullability(T)) {
1461         if (*nullability == NullabilityKind::Unspecified &&
1462             (PDecl->getPropertyAttributes() &
1463                ObjCPropertyDecl::OBJC_PR_null_resettable)) {
1464           Out << (first ? ' ' : ',') << "null_resettable";
1465         } else {
1466           Out << (first ? ' ' : ',')
1467               << getNullabilitySpelling(*nullability, true);
1468         }
1469         first = false;
1470       }
1471     }
1472 
1473     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_class) {
1474       Out << (first ? ' ' : ',') << "class";
1475       first = false;
1476     }
1477 
1478     (void) first; // Silence dead store warning due to idiomatic code.
1479     Out << " )";
1480   }
1481   Out << ' ' << PDecl->getASTContext().getUnqualifiedObjCPointerType(T).
1482                   getAsString(Policy) << ' ' << *PDecl;
1483   if (Policy.PolishForDeclaration)
1484     Out << ';';
1485 }
1486 
1487 void DeclPrinter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *PID) {
1488   if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize)
1489     Out << "@synthesize ";
1490   else
1491     Out << "@dynamic ";
1492   Out << *PID->getPropertyDecl();
1493   if (PID->getPropertyIvarDecl())
1494     Out << '=' << *PID->getPropertyIvarDecl();
1495 }
1496 
1497 void DeclPrinter::VisitUsingDecl(UsingDecl *D) {
1498   if (!D->isAccessDeclaration())
1499     Out << "using ";
1500   if (D->hasTypename())
1501     Out << "typename ";
1502   D->getQualifier()->print(Out, Policy);
1503 
1504   // Use the correct record name when the using declaration is used for
1505   // inheriting constructors.
1506   for (const auto *Shadow : D->shadows()) {
1507     if (const auto *ConstructorShadow =
1508             dyn_cast<ConstructorUsingShadowDecl>(Shadow)) {
1509       assert(Shadow->getDeclContext() == ConstructorShadow->getDeclContext());
1510       Out << *ConstructorShadow->getNominatedBaseClass();
1511       return;
1512     }
1513   }
1514   Out << *D;
1515 }
1516 
1517 void
1518 DeclPrinter::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) {
1519   Out << "using typename ";
1520   D->getQualifier()->print(Out, Policy);
1521   Out << D->getDeclName();
1522 }
1523 
1524 void DeclPrinter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1525   if (!D->isAccessDeclaration())
1526     Out << "using ";
1527   D->getQualifier()->print(Out, Policy);
1528   Out << D->getDeclName();
1529 }
1530 
1531 void DeclPrinter::VisitUsingShadowDecl(UsingShadowDecl *D) {
1532   // ignore
1533 }
1534 
1535 void DeclPrinter::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
1536   Out << "#pragma omp threadprivate";
1537   if (!D->varlist_empty()) {
1538     for (OMPThreadPrivateDecl::varlist_iterator I = D->varlist_begin(),
1539                                                 E = D->varlist_end();
1540                                                 I != E; ++I) {
1541       Out << (I == D->varlist_begin() ? '(' : ',');
1542       NamedDecl *ND = cast<DeclRefExpr>(*I)->getDecl();
1543       ND->printQualifiedName(Out);
1544     }
1545     Out << ")";
1546   }
1547 }
1548 
1549 void DeclPrinter::VisitOMPRequiresDecl(OMPRequiresDecl *D) {
1550   Out << "#pragma omp requires ";
1551   if (!D->clauselist_empty()) {
1552     OMPClausePrinter Printer(Out, Policy);
1553     for (auto I = D->clauselist_begin(), E = D->clauselist_end(); I != E; ++I)
1554       Printer.Visit(*I);
1555   }
1556 }
1557 
1558 void DeclPrinter::VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D) {
1559   if (!D->isInvalidDecl()) {
1560     Out << "#pragma omp declare reduction (";
1561     if (D->getDeclName().getNameKind() == DeclarationName::CXXOperatorName) {
1562       static const char *const OperatorNames[NUM_OVERLOADED_OPERATORS] = {
1563           nullptr,
1564 #define OVERLOADED_OPERATOR(Name, Spelling, Token, Unary, Binary, MemberOnly)  \
1565           Spelling,
1566 #include "clang/Basic/OperatorKinds.def"
1567       };
1568       const char *OpName =
1569           OperatorNames[D->getDeclName().getCXXOverloadedOperator()];
1570       assert(OpName && "not an overloaded operator");
1571       Out << OpName;
1572     } else {
1573       assert(D->getDeclName().isIdentifier());
1574       D->printName(Out);
1575     }
1576     Out << " : ";
1577     D->getType().print(Out, Policy);
1578     Out << " : ";
1579     D->getCombiner()->printPretty(Out, nullptr, Policy, 0);
1580     Out << ")";
1581     if (auto *Init = D->getInitializer()) {
1582       Out << " initializer(";
1583       switch (D->getInitializerKind()) {
1584       case OMPDeclareReductionDecl::DirectInit:
1585         Out << "omp_priv(";
1586         break;
1587       case OMPDeclareReductionDecl::CopyInit:
1588         Out << "omp_priv = ";
1589         break;
1590       case OMPDeclareReductionDecl::CallInit:
1591         break;
1592       }
1593       Init->printPretty(Out, nullptr, Policy, 0);
1594       if (D->getInitializerKind() == OMPDeclareReductionDecl::DirectInit)
1595         Out << ")";
1596       Out << ")";
1597     }
1598   }
1599 }
1600 
1601 void DeclPrinter::VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D) {
1602   D->getInit()->printPretty(Out, nullptr, Policy, Indentation);
1603 }
1604 
1605