xref: /freebsd/contrib/llvm-project/clang/lib/AST/DeclPrinter.cpp (revision f5b7695d2d5abd735064870ad43f4b9c723940c1) 
1 //===--- DeclPrinter.cpp - Printing implementation for Decl ASTs ----------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements the Decl::print method, which pretty prints the
10 // AST back out to C/Objective-C/C++/Objective-C++ code.
11 //
12 //===----------------------------------------------------------------------===//
13 #include "clang/AST/ASTContext.h"
14 #include "clang/AST/Attr.h"
15 #include "clang/AST/Decl.h"
16 #include "clang/AST/DeclCXX.h"
17 #include "clang/AST/DeclObjC.h"
18 #include "clang/AST/DeclTemplate.h"
19 #include "clang/AST/DeclVisitor.h"
20 #include "clang/AST/Expr.h"
21 #include "clang/AST/ExprCXX.h"
22 #include "clang/AST/PrettyPrinter.h"
23 #include "clang/Basic/Module.h"
24 #include "llvm/Support/raw_ostream.h"
25 using namespace clang;
26 
27 namespace {
28   class DeclPrinter : public DeclVisitor<DeclPrinter> {
29     raw_ostream &Out;
30     PrintingPolicy Policy;
31     const ASTContext &Context;
32     unsigned Indentation;
33     bool PrintInstantiation;
34 
35     raw_ostream& Indent() { return Indent(Indentation); }
36     raw_ostream& Indent(unsigned Indentation);
37     void ProcessDeclGroup(SmallVectorImpl<Decl*>& Decls);
38 
39     void Print(AccessSpecifier AS);
40     void PrintConstructorInitializers(CXXConstructorDecl *CDecl,
41                                       std::string &Proto);
42 
43     /// Print an Objective-C method type in parentheses.
44     ///
45     /// \param Quals The Objective-C declaration qualifiers.
46     /// \param T The type to print.
47     void PrintObjCMethodType(ASTContext &Ctx, Decl::ObjCDeclQualifier Quals,
48                              QualType T);
49 
50     void PrintObjCTypeParams(ObjCTypeParamList *Params);
51 
52   public:
53     DeclPrinter(raw_ostream &Out, const PrintingPolicy &Policy,
54                 const ASTContext &Context, unsigned Indentation = 0,
55                 bool PrintInstantiation = false)
56         : Out(Out), Policy(Policy), Context(Context), Indentation(Indentation),
57           PrintInstantiation(PrintInstantiation) {}
58 
59     void VisitDeclContext(DeclContext *DC, bool Indent = true);
60 
61     void VisitTranslationUnitDecl(TranslationUnitDecl *D);
62     void VisitTypedefDecl(TypedefDecl *D);
63     void VisitTypeAliasDecl(TypeAliasDecl *D);
64     void VisitEnumDecl(EnumDecl *D);
65     void VisitRecordDecl(RecordDecl *D);
66     void VisitEnumConstantDecl(EnumConstantDecl *D);
67     void VisitEmptyDecl(EmptyDecl *D);
68     void VisitFunctionDecl(FunctionDecl *D);
69     void VisitFriendDecl(FriendDecl *D);
70     void VisitFieldDecl(FieldDecl *D);
71     void VisitVarDecl(VarDecl *D);
72     void VisitLabelDecl(LabelDecl *D);
73     void VisitParmVarDecl(ParmVarDecl *D);
74     void VisitFileScopeAsmDecl(FileScopeAsmDecl *D);
75     void VisitImportDecl(ImportDecl *D);
76     void VisitStaticAssertDecl(StaticAssertDecl *D);
77     void VisitNamespaceDecl(NamespaceDecl *D);
78     void VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
79     void VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
80     void VisitCXXRecordDecl(CXXRecordDecl *D);
81     void VisitLinkageSpecDecl(LinkageSpecDecl *D);
82     void VisitTemplateDecl(const TemplateDecl *D);
83     void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
84     void VisitClassTemplateDecl(ClassTemplateDecl *D);
85     void VisitClassTemplateSpecializationDecl(
86                                             ClassTemplateSpecializationDecl *D);
87     void VisitClassTemplatePartialSpecializationDecl(
88                                      ClassTemplatePartialSpecializationDecl *D);
89     void VisitObjCMethodDecl(ObjCMethodDecl *D);
90     void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
91     void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
92     void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
93     void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
94     void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
95     void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
96     void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
97     void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
98     void VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
99     void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
100     void VisitUsingDecl(UsingDecl *D);
101     void VisitUsingShadowDecl(UsingShadowDecl *D);
102     void VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D);
103     void VisitOMPAllocateDecl(OMPAllocateDecl *D);
104     void VisitOMPRequiresDecl(OMPRequiresDecl *D);
105     void VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D);
106     void VisitOMPDeclareMapperDecl(OMPDeclareMapperDecl *D);
107     void VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D);
108 
109     void printTemplateParameters(const TemplateParameterList *Params,
110                                  bool OmitTemplateKW = false);
111     void printTemplateArguments(llvm::ArrayRef<TemplateArgument> Args);
112     void printTemplateArguments(llvm::ArrayRef<TemplateArgumentLoc> Args);
113     void prettyPrintAttributes(Decl *D);
114     void prettyPrintPragmas(Decl *D);
115     void printDeclType(QualType T, StringRef DeclName, bool Pack = false);
116   };
117 }
118 
119 void Decl::print(raw_ostream &Out, unsigned Indentation,
120                  bool PrintInstantiation) const {
121   print(Out, getASTContext().getPrintingPolicy(), Indentation, PrintInstantiation);
122 }
123 
124 void Decl::print(raw_ostream &Out, const PrintingPolicy &Policy,
125                  unsigned Indentation, bool PrintInstantiation) const {
126   DeclPrinter Printer(Out, Policy, getASTContext(), Indentation,
127                       PrintInstantiation);
128   Printer.Visit(const_cast<Decl*>(this));
129 }
130 
131 void TemplateParameterList::print(raw_ostream &Out, const ASTContext &Context,
132                                   bool OmitTemplateKW) const {
133   print(Out, Context, Context.getPrintingPolicy(), OmitTemplateKW);
134 }
135 
136 void TemplateParameterList::print(raw_ostream &Out, const ASTContext &Context,
137                                   const PrintingPolicy &Policy,
138                                   bool OmitTemplateKW) const {
139   DeclPrinter Printer(Out, Policy, Context);
140   Printer.printTemplateParameters(this, OmitTemplateKW);
141 }
142 
143 static QualType GetBaseType(QualType T) {
144   // FIXME: This should be on the Type class!
145   QualType BaseType = T;
146   while (!BaseType->isSpecifierType()) {
147     if (const PointerType *PTy = BaseType->getAs<PointerType>())
148       BaseType = PTy->getPointeeType();
149     else if (const BlockPointerType *BPy = BaseType->getAs<BlockPointerType>())
150       BaseType = BPy->getPointeeType();
151     else if (const ArrayType* ATy = dyn_cast<ArrayType>(BaseType))
152       BaseType = ATy->getElementType();
153     else if (const FunctionType* FTy = BaseType->getAs<FunctionType>())
154       BaseType = FTy->getReturnType();
155     else if (const VectorType *VTy = BaseType->getAs<VectorType>())
156       BaseType = VTy->getElementType();
157     else if (const ReferenceType *RTy = BaseType->getAs<ReferenceType>())
158       BaseType = RTy->getPointeeType();
159     else if (const AutoType *ATy = BaseType->getAs<AutoType>())
160       BaseType = ATy->getDeducedType();
161     else if (const ParenType *PTy = BaseType->getAs<ParenType>())
162       BaseType = PTy->desugar();
163     else
164       // This must be a syntax error.
165       break;
166   }
167   return BaseType;
168 }
169 
170 static QualType getDeclType(Decl* D) {
171   if (TypedefNameDecl* TDD = dyn_cast<TypedefNameDecl>(D))
172     return TDD->getUnderlyingType();
173   if (ValueDecl* VD = dyn_cast<ValueDecl>(D))
174     return VD->getType();
175   return QualType();
176 }
177 
178 void Decl::printGroup(Decl** Begin, unsigned NumDecls,
179                       raw_ostream &Out, const PrintingPolicy &Policy,
180                       unsigned Indentation) {
181   if (NumDecls == 1) {
182     (*Begin)->print(Out, Policy, Indentation);
183     return;
184   }
185 
186   Decl** End = Begin + NumDecls;
187   TagDecl* TD = dyn_cast<TagDecl>(*Begin);
188   if (TD)
189     ++Begin;
190 
191   PrintingPolicy SubPolicy(Policy);
192 
193   bool isFirst = true;
194   for ( ; Begin != End; ++Begin) {
195     if (isFirst) {
196       if(TD)
197         SubPolicy.IncludeTagDefinition = true;
198       SubPolicy.SuppressSpecifiers = false;
199       isFirst = false;
200     } else {
201       if (!isFirst) Out << ", ";
202       SubPolicy.IncludeTagDefinition = false;
203       SubPolicy.SuppressSpecifiers = true;
204     }
205 
206     (*Begin)->print(Out, SubPolicy, Indentation);
207   }
208 }
209 
210 LLVM_DUMP_METHOD void DeclContext::dumpDeclContext() const {
211   // Get the translation unit
212   const DeclContext *DC = this;
213   while (!DC->isTranslationUnit())
214     DC = DC->getParent();
215 
216   ASTContext &Ctx = cast<TranslationUnitDecl>(DC)->getASTContext();
217   DeclPrinter Printer(llvm::errs(), Ctx.getPrintingPolicy(), Ctx, 0);
218   Printer.VisitDeclContext(const_cast<DeclContext *>(this), /*Indent=*/false);
219 }
220 
221 raw_ostream& DeclPrinter::Indent(unsigned Indentation) {
222   for (unsigned i = 0; i != Indentation; ++i)
223     Out << "  ";
224   return Out;
225 }
226 
227 void DeclPrinter::prettyPrintAttributes(Decl *D) {
228   if (Policy.PolishForDeclaration)
229     return;
230 
231   if (D->hasAttrs()) {
232     AttrVec &Attrs = D->getAttrs();
233     for (auto *A : Attrs) {
234       if (A->isInherited() || A->isImplicit())
235         continue;
236       switch (A->getKind()) {
237 #define ATTR(X)
238 #define PRAGMA_SPELLING_ATTR(X) case attr::X:
239 #include "clang/Basic/AttrList.inc"
240         break;
241       default:
242         A->printPretty(Out, Policy);
243         break;
244       }
245     }
246   }
247 }
248 
249 void DeclPrinter::prettyPrintPragmas(Decl *D) {
250   if (Policy.PolishForDeclaration)
251     return;
252 
253   if (D->hasAttrs()) {
254     AttrVec &Attrs = D->getAttrs();
255     for (auto *A : Attrs) {
256       switch (A->getKind()) {
257 #define ATTR(X)
258 #define PRAGMA_SPELLING_ATTR(X) case attr::X:
259 #include "clang/Basic/AttrList.inc"
260         A->printPretty(Out, Policy);
261         Indent();
262         break;
263       default:
264         break;
265       }
266     }
267   }
268 }
269 
270 void DeclPrinter::printDeclType(QualType T, StringRef DeclName, bool Pack) {
271   // Normally, a PackExpansionType is written as T[3]... (for instance, as a
272   // template argument), but if it is the type of a declaration, the ellipsis
273   // is placed before the name being declared.
274   if (auto *PET = T->getAs<PackExpansionType>()) {
275     Pack = true;
276     T = PET->getPattern();
277   }
278   T.print(Out, Policy, (Pack ? "..." : "") + DeclName, Indentation);
279 }
280 
281 void DeclPrinter::ProcessDeclGroup(SmallVectorImpl<Decl*>& Decls) {
282   this->Indent();
283   Decl::printGroup(Decls.data(), Decls.size(), Out, Policy, Indentation);
284   Out << ";\n";
285   Decls.clear();
286 
287 }
288 
289 void DeclPrinter::Print(AccessSpecifier AS) {
290   switch(AS) {
291   case AS_none:      llvm_unreachable("No access specifier!");
292   case AS_public:    Out << "public"; break;
293   case AS_protected: Out << "protected"; break;
294   case AS_private:   Out << "private"; break;
295   }
296 }
297 
298 void DeclPrinter::PrintConstructorInitializers(CXXConstructorDecl *CDecl,
299                                                std::string &Proto) {
300   bool HasInitializerList = false;
301   for (const auto *BMInitializer : CDecl->inits()) {
302     if (BMInitializer->isInClassMemberInitializer())
303       continue;
304 
305     if (!HasInitializerList) {
306       Proto += " : ";
307       Out << Proto;
308       Proto.clear();
309       HasInitializerList = true;
310     } else
311       Out << ", ";
312 
313     if (BMInitializer->isAnyMemberInitializer()) {
314       FieldDecl *FD = BMInitializer->getAnyMember();
315       Out << *FD;
316     } else {
317       Out << QualType(BMInitializer->getBaseClass(), 0).getAsString(Policy);
318     }
319 
320     Out << "(";
321     if (!BMInitializer->getInit()) {
322       // Nothing to print
323     } else {
324       Expr *Init = BMInitializer->getInit();
325       if (ExprWithCleanups *Tmp = dyn_cast<ExprWithCleanups>(Init))
326         Init = Tmp->getSubExpr();
327 
328       Init = Init->IgnoreParens();
329 
330       Expr *SimpleInit = nullptr;
331       Expr **Args = nullptr;
332       unsigned NumArgs = 0;
333       if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
334         Args = ParenList->getExprs();
335         NumArgs = ParenList->getNumExprs();
336       } else if (CXXConstructExpr *Construct =
337                      dyn_cast<CXXConstructExpr>(Init)) {
338         Args = Construct->getArgs();
339         NumArgs = Construct->getNumArgs();
340       } else
341         SimpleInit = Init;
342 
343       if (SimpleInit)
344         SimpleInit->printPretty(Out, nullptr, Policy, Indentation);
345       else {
346         for (unsigned I = 0; I != NumArgs; ++I) {
347           assert(Args[I] != nullptr && "Expected non-null Expr");
348           if (isa<CXXDefaultArgExpr>(Args[I]))
349             break;
350 
351           if (I)
352             Out << ", ";
353           Args[I]->printPretty(Out, nullptr, Policy, Indentation);
354         }
355       }
356     }
357     Out << ")";
358     if (BMInitializer->isPackExpansion())
359       Out << "...";
360   }
361 }
362 
363 //----------------------------------------------------------------------------
364 // Common C declarations
365 //----------------------------------------------------------------------------
366 
367 void DeclPrinter::VisitDeclContext(DeclContext *DC, bool Indent) {
368   if (Policy.TerseOutput)
369     return;
370 
371   if (Indent)
372     Indentation += Policy.Indentation;
373 
374   SmallVector<Decl*, 2> Decls;
375   for (DeclContext::decl_iterator D = DC->decls_begin(), DEnd = DC->decls_end();
376        D != DEnd; ++D) {
377 
378     // Don't print ObjCIvarDecls, as they are printed when visiting the
379     // containing ObjCInterfaceDecl.
380     if (isa<ObjCIvarDecl>(*D))
381       continue;
382 
383     // Skip over implicit declarations in pretty-printing mode.
384     if (D->isImplicit())
385       continue;
386 
387     // Don't print implicit specializations, as they are printed when visiting
388     // corresponding templates.
389     if (auto FD = dyn_cast<FunctionDecl>(*D))
390       if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation &&
391           !isa<ClassTemplateSpecializationDecl>(DC))
392         continue;
393 
394     // The next bits of code handle stuff like "struct {int x;} a,b"; we're
395     // forced to merge the declarations because there's no other way to
396     // refer to the struct in question.  When that struct is named instead, we
397     // also need to merge to avoid splitting off a stand-alone struct
398     // declaration that produces the warning ext_no_declarators in some
399     // contexts.
400     //
401     // This limited merging is safe without a bunch of other checks because it
402     // only merges declarations directly referring to the tag, not typedefs.
403     //
404     // Check whether the current declaration should be grouped with a previous
405     // non-free-standing tag declaration.
406     QualType CurDeclType = getDeclType(*D);
407     if (!Decls.empty() && !CurDeclType.isNull()) {
408       QualType BaseType = GetBaseType(CurDeclType);
409       if (!BaseType.isNull() && isa<ElaboratedType>(BaseType) &&
410           cast<ElaboratedType>(BaseType)->getOwnedTagDecl() == Decls[0]) {
411         Decls.push_back(*D);
412         continue;
413       }
414     }
415 
416     // If we have a merged group waiting to be handled, handle it now.
417     if (!Decls.empty())
418       ProcessDeclGroup(Decls);
419 
420     // If the current declaration is not a free standing declaration, save it
421     // so we can merge it with the subsequent declaration(s) using it.
422     if (isa<TagDecl>(*D) && !cast<TagDecl>(*D)->isFreeStanding()) {
423       Decls.push_back(*D);
424       continue;
425     }
426 
427     if (isa<AccessSpecDecl>(*D)) {
428       Indentation -= Policy.Indentation;
429       this->Indent();
430       Print(D->getAccess());
431       Out << ":\n";
432       Indentation += Policy.Indentation;
433       continue;
434     }
435 
436     this->Indent();
437     Visit(*D);
438 
439     // FIXME: Need to be able to tell the DeclPrinter when
440     const char *Terminator = nullptr;
441     if (isa<OMPThreadPrivateDecl>(*D) || isa<OMPDeclareReductionDecl>(*D) ||
442         isa<OMPDeclareMapperDecl>(*D) || isa<OMPRequiresDecl>(*D) ||
443         isa<OMPAllocateDecl>(*D))
444       Terminator = nullptr;
445     else if (isa<ObjCMethodDecl>(*D) && cast<ObjCMethodDecl>(*D)->hasBody())
446       Terminator = nullptr;
447     else if (auto FD = dyn_cast<FunctionDecl>(*D)) {
448       if (FD->isThisDeclarationADefinition())
449         Terminator = nullptr;
450       else
451         Terminator = ";";
452     } else if (auto TD = dyn_cast<FunctionTemplateDecl>(*D)) {
453       if (TD->getTemplatedDecl()->isThisDeclarationADefinition())
454         Terminator = nullptr;
455       else
456         Terminator = ";";
457     } else if (isa<NamespaceDecl>(*D) || isa<LinkageSpecDecl>(*D) ||
458              isa<ObjCImplementationDecl>(*D) ||
459              isa<ObjCInterfaceDecl>(*D) ||
460              isa<ObjCProtocolDecl>(*D) ||
461              isa<ObjCCategoryImplDecl>(*D) ||
462              isa<ObjCCategoryDecl>(*D))
463       Terminator = nullptr;
464     else if (isa<EnumConstantDecl>(*D)) {
465       DeclContext::decl_iterator Next = D;
466       ++Next;
467       if (Next != DEnd)
468         Terminator = ",";
469     } else
470       Terminator = ";";
471 
472     if (Terminator)
473       Out << Terminator;
474     if (!Policy.TerseOutput &&
475         ((isa<FunctionDecl>(*D) &&
476           cast<FunctionDecl>(*D)->doesThisDeclarationHaveABody()) ||
477          (isa<FunctionTemplateDecl>(*D) &&
478           cast<FunctionTemplateDecl>(*D)->getTemplatedDecl()->doesThisDeclarationHaveABody())))
479       ; // StmtPrinter already added '\n' after CompoundStmt.
480     else
481       Out << "\n";
482 
483     // Declare target attribute is special one, natural spelling for the pragma
484     // assumes "ending" construct so print it here.
485     if (D->hasAttr<OMPDeclareTargetDeclAttr>())
486       Out << "#pragma omp end declare target\n";
487   }
488 
489   if (!Decls.empty())
490     ProcessDeclGroup(Decls);
491 
492   if (Indent)
493     Indentation -= Policy.Indentation;
494 }
495 
496 void DeclPrinter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
497   VisitDeclContext(D, false);
498 }
499 
500 void DeclPrinter::VisitTypedefDecl(TypedefDecl *D) {
501   if (!Policy.SuppressSpecifiers) {
502     Out << "typedef ";
503 
504     if (D->isModulePrivate())
505       Out << "__module_private__ ";
506   }
507   QualType Ty = D->getTypeSourceInfo()->getType();
508   Ty.print(Out, Policy, D->getName(), Indentation);
509   prettyPrintAttributes(D);
510 }
511 
512 void DeclPrinter::VisitTypeAliasDecl(TypeAliasDecl *D) {
513   Out << "using " << *D;
514   prettyPrintAttributes(D);
515   Out << " = " << D->getTypeSourceInfo()->getType().getAsString(Policy);
516 }
517 
518 void DeclPrinter::VisitEnumDecl(EnumDecl *D) {
519   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
520     Out << "__module_private__ ";
521   Out << "enum";
522   if (D->isScoped()) {
523     if (D->isScopedUsingClassTag())
524       Out << " class";
525     else
526       Out << " struct";
527   }
528 
529   prettyPrintAttributes(D);
530 
531   Out << ' ' << *D;
532 
533   if (D->isFixed() && D->getASTContext().getLangOpts().CPlusPlus11)
534     Out << " : " << D->getIntegerType().stream(Policy);
535 
536   if (D->isCompleteDefinition()) {
537     Out << " {\n";
538     VisitDeclContext(D);
539     Indent() << "}";
540   }
541 }
542 
543 void DeclPrinter::VisitRecordDecl(RecordDecl *D) {
544   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
545     Out << "__module_private__ ";
546   Out << D->getKindName();
547 
548   prettyPrintAttributes(D);
549 
550   if (D->getIdentifier())
551     Out << ' ' << *D;
552 
553   if (D->isCompleteDefinition()) {
554     Out << " {\n";
555     VisitDeclContext(D);
556     Indent() << "}";
557   }
558 }
559 
560 void DeclPrinter::VisitEnumConstantDecl(EnumConstantDecl *D) {
561   Out << *D;
562   prettyPrintAttributes(D);
563   if (Expr *Init = D->getInitExpr()) {
564     Out << " = ";
565     Init->printPretty(Out, nullptr, Policy, Indentation, "\n", &Context);
566   }
567 }
568 
569 static void printExplicitSpecifier(ExplicitSpecifier ES, llvm::raw_ostream &Out,
570                                    PrintingPolicy &Policy,
571                                    unsigned Indentation) {
572   std::string Proto = "explicit";
573   llvm::raw_string_ostream EOut(Proto);
574   if (ES.getExpr()) {
575     EOut << "(";
576     ES.getExpr()->printPretty(EOut, nullptr, Policy, Indentation);
577     EOut << ")";
578   }
579   EOut << " ";
580   EOut.flush();
581   Out << EOut.str();
582 }
583 
584 void DeclPrinter::VisitFunctionDecl(FunctionDecl *D) {
585   if (!D->getDescribedFunctionTemplate() &&
586       !D->isFunctionTemplateSpecialization())
587     prettyPrintPragmas(D);
588 
589   if (D->isFunctionTemplateSpecialization())
590     Out << "template<> ";
591   else if (!D->getDescribedFunctionTemplate()) {
592     for (unsigned I = 0, NumTemplateParams = D->getNumTemplateParameterLists();
593          I < NumTemplateParams; ++I)
594       printTemplateParameters(D->getTemplateParameterList(I));
595   }
596 
597   CXXConstructorDecl *CDecl = dyn_cast<CXXConstructorDecl>(D);
598   CXXConversionDecl *ConversionDecl = dyn_cast<CXXConversionDecl>(D);
599   CXXDeductionGuideDecl *GuideDecl = dyn_cast<CXXDeductionGuideDecl>(D);
600   if (!Policy.SuppressSpecifiers) {
601     switch (D->getStorageClass()) {
602     case SC_None: break;
603     case SC_Extern: Out << "extern "; break;
604     case SC_Static: Out << "static "; break;
605     case SC_PrivateExtern: Out << "__private_extern__ "; break;
606     case SC_Auto: case SC_Register:
607       llvm_unreachable("invalid for functions");
608     }
609 
610     if (D->isInlineSpecified())  Out << "inline ";
611     if (D->isVirtualAsWritten()) Out << "virtual ";
612     if (D->isModulePrivate())    Out << "__module_private__ ";
613     if (D->isConstexprSpecified() && !D->isExplicitlyDefaulted())
614       Out << "constexpr ";
615     if (D->isConsteval())        Out << "consteval ";
616     ExplicitSpecifier ExplicitSpec = ExplicitSpecifier::getFromDecl(D);
617     if (ExplicitSpec.isSpecified())
618       printExplicitSpecifier(ExplicitSpec, Out, Policy, Indentation);
619   }
620 
621   PrintingPolicy SubPolicy(Policy);
622   SubPolicy.SuppressSpecifiers = false;
623   std::string Proto;
624 
625   if (Policy.FullyQualifiedName) {
626     Proto += D->getQualifiedNameAsString();
627   } else {
628     llvm::raw_string_ostream OS(Proto);
629     if (!Policy.SuppressScope) {
630       if (const NestedNameSpecifier *NS = D->getQualifier()) {
631         NS->print(OS, Policy);
632       }
633     }
634     D->getNameInfo().printName(OS, Policy);
635   }
636 
637   if (GuideDecl)
638     Proto = GuideDecl->getDeducedTemplate()->getDeclName().getAsString();
639   if (D->isFunctionTemplateSpecialization()) {
640     llvm::raw_string_ostream POut(Proto);
641     DeclPrinter TArgPrinter(POut, SubPolicy, Context, Indentation);
642     const auto *TArgAsWritten = D->getTemplateSpecializationArgsAsWritten();
643     if (TArgAsWritten && !Policy.PrintCanonicalTypes)
644       TArgPrinter.printTemplateArguments(TArgAsWritten->arguments());
645     else if (const TemplateArgumentList *TArgs =
646                  D->getTemplateSpecializationArgs())
647       TArgPrinter.printTemplateArguments(TArgs->asArray());
648   }
649 
650   QualType Ty = D->getType();
651   while (const ParenType *PT = dyn_cast<ParenType>(Ty)) {
652     Proto = '(' + Proto + ')';
653     Ty = PT->getInnerType();
654   }
655 
656   if (const FunctionType *AFT = Ty->getAs<FunctionType>()) {
657     const FunctionProtoType *FT = nullptr;
658     if (D->hasWrittenPrototype())
659       FT = dyn_cast<FunctionProtoType>(AFT);
660 
661     Proto += "(";
662     if (FT) {
663       llvm::raw_string_ostream POut(Proto);
664       DeclPrinter ParamPrinter(POut, SubPolicy, Context, Indentation);
665       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
666         if (i) POut << ", ";
667         ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
668       }
669 
670       if (FT->isVariadic()) {
671         if (D->getNumParams()) POut << ", ";
672         POut << "...";
673       }
674     } else if (D->doesThisDeclarationHaveABody() && !D->hasPrototype()) {
675       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
676         if (i)
677           Proto += ", ";
678         Proto += D->getParamDecl(i)->getNameAsString();
679       }
680     }
681 
682     Proto += ")";
683 
684     if (FT) {
685       if (FT->isConst())
686         Proto += " const";
687       if (FT->isVolatile())
688         Proto += " volatile";
689       if (FT->isRestrict())
690         Proto += " restrict";
691 
692       switch (FT->getRefQualifier()) {
693       case RQ_None:
694         break;
695       case RQ_LValue:
696         Proto += " &";
697         break;
698       case RQ_RValue:
699         Proto += " &&";
700         break;
701       }
702     }
703 
704     if (FT && FT->hasDynamicExceptionSpec()) {
705       Proto += " throw(";
706       if (FT->getExceptionSpecType() == EST_MSAny)
707         Proto += "...";
708       else
709         for (unsigned I = 0, N = FT->getNumExceptions(); I != N; ++I) {
710           if (I)
711             Proto += ", ";
712 
713           Proto += FT->getExceptionType(I).getAsString(SubPolicy);
714         }
715       Proto += ")";
716     } else if (FT && isNoexceptExceptionSpec(FT->getExceptionSpecType())) {
717       Proto += " noexcept";
718       if (isComputedNoexcept(FT->getExceptionSpecType())) {
719         Proto += "(";
720         llvm::raw_string_ostream EOut(Proto);
721         FT->getNoexceptExpr()->printPretty(EOut, nullptr, SubPolicy,
722                                            Indentation);
723         EOut.flush();
724         Proto += EOut.str();
725         Proto += ")";
726       }
727     }
728 
729     if (CDecl) {
730       if (!Policy.TerseOutput)
731         PrintConstructorInitializers(CDecl, Proto);
732     } else if (!ConversionDecl && !isa<CXXDestructorDecl>(D)) {
733       if (FT && FT->hasTrailingReturn()) {
734         if (!GuideDecl)
735           Out << "auto ";
736         Out << Proto << " -> ";
737         Proto.clear();
738       }
739       AFT->getReturnType().print(Out, Policy, Proto);
740       Proto.clear();
741     }
742     Out << Proto;
743 
744     if (Expr *TrailingRequiresClause = D->getTrailingRequiresClause()) {
745       Out << " requires ";
746       TrailingRequiresClause->printPretty(Out, nullptr, SubPolicy, Indentation);
747     }
748   } else {
749     Ty.print(Out, Policy, Proto);
750   }
751 
752   prettyPrintAttributes(D);
753 
754   if (D->isPure())
755     Out << " = 0";
756   else if (D->isDeletedAsWritten())
757     Out << " = delete";
758   else if (D->isExplicitlyDefaulted())
759     Out << " = default";
760   else if (D->doesThisDeclarationHaveABody()) {
761     if (!Policy.TerseOutput) {
762       if (!D->hasPrototype() && D->getNumParams()) {
763         // This is a K&R function definition, so we need to print the
764         // parameters.
765         Out << '\n';
766         DeclPrinter ParamPrinter(Out, SubPolicy, Context, Indentation);
767         Indentation += Policy.Indentation;
768         for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
769           Indent();
770           ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
771           Out << ";\n";
772         }
773         Indentation -= Policy.Indentation;
774       } else
775         Out << ' ';
776 
777       if (D->getBody())
778         D->getBody()->printPretty(Out, nullptr, SubPolicy, Indentation);
779     } else {
780       if (!Policy.TerseOutput && isa<CXXConstructorDecl>(*D))
781         Out << " {}";
782     }
783   }
784 }
785 
786 void DeclPrinter::VisitFriendDecl(FriendDecl *D) {
787   if (TypeSourceInfo *TSI = D->getFriendType()) {
788     unsigned NumTPLists = D->getFriendTypeNumTemplateParameterLists();
789     for (unsigned i = 0; i < NumTPLists; ++i)
790       printTemplateParameters(D->getFriendTypeTemplateParameterList(i));
791     Out << "friend ";
792     Out << " " << TSI->getType().getAsString(Policy);
793   }
794   else if (FunctionDecl *FD =
795       dyn_cast<FunctionDecl>(D->getFriendDecl())) {
796     Out << "friend ";
797     VisitFunctionDecl(FD);
798   }
799   else if (FunctionTemplateDecl *FTD =
800            dyn_cast<FunctionTemplateDecl>(D->getFriendDecl())) {
801     Out << "friend ";
802     VisitFunctionTemplateDecl(FTD);
803   }
804   else if (ClassTemplateDecl *CTD =
805            dyn_cast<ClassTemplateDecl>(D->getFriendDecl())) {
806     Out << "friend ";
807     VisitRedeclarableTemplateDecl(CTD);
808   }
809 }
810 
811 void DeclPrinter::VisitFieldDecl(FieldDecl *D) {
812   // FIXME: add printing of pragma attributes if required.
813   if (!Policy.SuppressSpecifiers && D->isMutable())
814     Out << "mutable ";
815   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
816     Out << "__module_private__ ";
817 
818   Out << D->getASTContext().getUnqualifiedObjCPointerType(D->getType()).
819          stream(Policy, D->getName(), Indentation);
820 
821   if (D->isBitField()) {
822     Out << " : ";
823     D->getBitWidth()->printPretty(Out, nullptr, Policy, Indentation);
824   }
825 
826   Expr *Init = D->getInClassInitializer();
827   if (!Policy.SuppressInitializers && Init) {
828     if (D->getInClassInitStyle() == ICIS_ListInit)
829       Out << " ";
830     else
831       Out << " = ";
832     Init->printPretty(Out, nullptr, Policy, Indentation);
833   }
834   prettyPrintAttributes(D);
835 }
836 
837 void DeclPrinter::VisitLabelDecl(LabelDecl *D) {
838   Out << *D << ":";
839 }
840 
841 void DeclPrinter::VisitVarDecl(VarDecl *D) {
842   prettyPrintPragmas(D);
843 
844   QualType T = D->getTypeSourceInfo()
845     ? D->getTypeSourceInfo()->getType()
846     : D->getASTContext().getUnqualifiedObjCPointerType(D->getType());
847 
848   if (!Policy.SuppressSpecifiers) {
849     StorageClass SC = D->getStorageClass();
850     if (SC != SC_None)
851       Out << VarDecl::getStorageClassSpecifierString(SC) << " ";
852 
853     switch (D->getTSCSpec()) {
854     case TSCS_unspecified:
855       break;
856     case TSCS___thread:
857       Out << "__thread ";
858       break;
859     case TSCS__Thread_local:
860       Out << "_Thread_local ";
861       break;
862     case TSCS_thread_local:
863       Out << "thread_local ";
864       break;
865     }
866 
867     if (D->isModulePrivate())
868       Out << "__module_private__ ";
869 
870     if (D->isConstexpr()) {
871       Out << "constexpr ";
872       T.removeLocalConst();
873     }
874   }
875 
876   printDeclType(T, D->getName());
877   Expr *Init = D->getInit();
878   if (!Policy.SuppressInitializers && Init) {
879     bool ImplicitInit = false;
880     if (CXXConstructExpr *Construct =
881             dyn_cast<CXXConstructExpr>(Init->IgnoreImplicit())) {
882       if (D->getInitStyle() == VarDecl::CallInit &&
883           !Construct->isListInitialization()) {
884         ImplicitInit = Construct->getNumArgs() == 0 ||
885           Construct->getArg(0)->isDefaultArgument();
886       }
887     }
888     if (!ImplicitInit) {
889       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
890         Out << "(";
891       else if (D->getInitStyle() == VarDecl::CInit) {
892         Out << " = ";
893       }
894       PrintingPolicy SubPolicy(Policy);
895       SubPolicy.SuppressSpecifiers = false;
896       SubPolicy.IncludeTagDefinition = false;
897       Init->printPretty(Out, nullptr, SubPolicy, Indentation);
898       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
899         Out << ")";
900     }
901   }
902   prettyPrintAttributes(D);
903 }
904 
905 void DeclPrinter::VisitParmVarDecl(ParmVarDecl *D) {
906   VisitVarDecl(D);
907 }
908 
909 void DeclPrinter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
910   Out << "__asm (";
911   D->getAsmString()->printPretty(Out, nullptr, Policy, Indentation);
912   Out << ")";
913 }
914 
915 void DeclPrinter::VisitImportDecl(ImportDecl *D) {
916   Out << "@import " << D->getImportedModule()->getFullModuleName()
917       << ";\n";
918 }
919 
920 void DeclPrinter::VisitStaticAssertDecl(StaticAssertDecl *D) {
921   Out << "static_assert(";
922   D->getAssertExpr()->printPretty(Out, nullptr, Policy, Indentation);
923   if (StringLiteral *SL = D->getMessage()) {
924     Out << ", ";
925     SL->printPretty(Out, nullptr, Policy, Indentation);
926   }
927   Out << ")";
928 }
929 
930 //----------------------------------------------------------------------------
931 // C++ declarations
932 //----------------------------------------------------------------------------
933 void DeclPrinter::VisitNamespaceDecl(NamespaceDecl *D) {
934   if (D->isInline())
935     Out << "inline ";
936   Out << "namespace " << *D << " {\n";
937   VisitDeclContext(D);
938   Indent() << "}";
939 }
940 
941 void DeclPrinter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
942   Out << "using namespace ";
943   if (D->getQualifier())
944     D->getQualifier()->print(Out, Policy);
945   Out << *D->getNominatedNamespaceAsWritten();
946 }
947 
948 void DeclPrinter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
949   Out << "namespace " << *D << " = ";
950   if (D->getQualifier())
951     D->getQualifier()->print(Out, Policy);
952   Out << *D->getAliasedNamespace();
953 }
954 
955 void DeclPrinter::VisitEmptyDecl(EmptyDecl *D) {
956   prettyPrintAttributes(D);
957 }
958 
959 void DeclPrinter::VisitCXXRecordDecl(CXXRecordDecl *D) {
960   // FIXME: add printing of pragma attributes if required.
961   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
962     Out << "__module_private__ ";
963   Out << D->getKindName();
964 
965   prettyPrintAttributes(D);
966 
967   if (D->getIdentifier()) {
968     Out << ' ' << *D;
969 
970     if (auto S = dyn_cast<ClassTemplateSpecializationDecl>(D)) {
971       ArrayRef<TemplateArgument> Args = S->getTemplateArgs().asArray();
972       if (!Policy.PrintCanonicalTypes)
973         if (const auto* TSI = S->getTypeAsWritten())
974           if (const auto *TST =
975                   dyn_cast<TemplateSpecializationType>(TSI->getType()))
976             Args = TST->template_arguments();
977       printTemplateArguments(Args);
978     }
979   }
980 
981   if (D->isCompleteDefinition()) {
982     // Print the base classes
983     if (D->getNumBases()) {
984       Out << " : ";
985       for (CXXRecordDecl::base_class_iterator Base = D->bases_begin(),
986              BaseEnd = D->bases_end(); Base != BaseEnd; ++Base) {
987         if (Base != D->bases_begin())
988           Out << ", ";
989 
990         if (Base->isVirtual())
991           Out << "virtual ";
992 
993         AccessSpecifier AS = Base->getAccessSpecifierAsWritten();
994         if (AS != AS_none) {
995           Print(AS);
996           Out << " ";
997         }
998         Out << Base->getType().getAsString(Policy);
999 
1000         if (Base->isPackExpansion())
1001           Out << "...";
1002       }
1003     }
1004 
1005     // Print the class definition
1006     // FIXME: Doesn't print access specifiers, e.g., "public:"
1007     if (Policy.TerseOutput) {
1008       Out << " {}";
1009     } else {
1010       Out << " {\n";
1011       VisitDeclContext(D);
1012       Indent() << "}";
1013     }
1014   }
1015 }
1016 
1017 void DeclPrinter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
1018   const char *l;
1019   if (D->getLanguage() == LinkageSpecDecl::lang_c)
1020     l = "C";
1021   else {
1022     assert(D->getLanguage() == LinkageSpecDecl::lang_cxx &&
1023            "unknown language in linkage specification");
1024     l = "C++";
1025   }
1026 
1027   Out << "extern \"" << l << "\" ";
1028   if (D->hasBraces()) {
1029     Out << "{\n";
1030     VisitDeclContext(D);
1031     Indent() << "}";
1032   } else
1033     Visit(*D->decls_begin());
1034 }
1035 
1036 void DeclPrinter::printTemplateParameters(const TemplateParameterList *Params,
1037                                           bool OmitTemplateKW) {
1038   assert(Params);
1039 
1040   if (!OmitTemplateKW)
1041     Out << "template ";
1042   Out << '<';
1043 
1044   bool NeedComma = false;
1045   for (const Decl *Param : *Params) {
1046     if (Param->isImplicit())
1047       continue;
1048 
1049     if (NeedComma)
1050       Out << ", ";
1051     else
1052       NeedComma = true;
1053 
1054     if (auto TTP = dyn_cast<TemplateTypeParmDecl>(Param)) {
1055 
1056       if (const TypeConstraint *TC = TTP->getTypeConstraint())
1057         TC->print(Out, Policy);
1058       else if (TTP->wasDeclaredWithTypename())
1059         Out << "typename";
1060       else
1061         Out << "class";
1062 
1063       if (TTP->isParameterPack())
1064         Out << " ...";
1065       else if (!TTP->getName().empty())
1066         Out << ' ';
1067 
1068       Out << *TTP;
1069 
1070       if (TTP->hasDefaultArgument()) {
1071         Out << " = ";
1072         Out << TTP->getDefaultArgument().getAsString(Policy);
1073       };
1074     } else if (auto NTTP = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
1075       StringRef Name;
1076       if (IdentifierInfo *II = NTTP->getIdentifier())
1077         Name = II->getName();
1078       printDeclType(NTTP->getType(), Name, NTTP->isParameterPack());
1079 
1080       if (NTTP->hasDefaultArgument()) {
1081         Out << " = ";
1082         NTTP->getDefaultArgument()->printPretty(Out, nullptr, Policy,
1083                                                 Indentation);
1084       }
1085     } else if (auto TTPD = dyn_cast<TemplateTemplateParmDecl>(Param)) {
1086       VisitTemplateDecl(TTPD);
1087       // FIXME: print the default argument, if present.
1088     }
1089   }
1090 
1091   Out << '>';
1092   if (!OmitTemplateKW)
1093     Out << ' ';
1094 }
1095 
1096 void DeclPrinter::printTemplateArguments(ArrayRef<TemplateArgument> Args) {
1097   Out << "<";
1098   for (size_t I = 0, E = Args.size(); I < E; ++I) {
1099     if (I)
1100       Out << ", ";
1101     Args[I].print(Policy, Out);
1102   }
1103   Out << ">";
1104 }
1105 
1106 void DeclPrinter::printTemplateArguments(ArrayRef<TemplateArgumentLoc> Args) {
1107   Out << "<";
1108   for (size_t I = 0, E = Args.size(); I < E; ++I) {
1109     if (I)
1110       Out << ", ";
1111     Args[I].getArgument().print(Policy, Out);
1112   }
1113   Out << ">";
1114 }
1115 
1116 void DeclPrinter::VisitTemplateDecl(const TemplateDecl *D) {
1117   printTemplateParameters(D->getTemplateParameters());
1118 
1119   if (const TemplateTemplateParmDecl *TTP =
1120         dyn_cast<TemplateTemplateParmDecl>(D)) {
1121     Out << "class ";
1122     if (TTP->isParameterPack())
1123       Out << "...";
1124     Out << D->getName();
1125   } else if (auto *TD = D->getTemplatedDecl())
1126     Visit(TD);
1127   else if (const auto *Concept = dyn_cast<ConceptDecl>(D)) {
1128     Out << "concept " << Concept->getName() << " = " ;
1129     Concept->getConstraintExpr()->printPretty(Out, nullptr, Policy,
1130                                               Indentation);
1131     Out << ";";
1132   }
1133 }
1134 
1135 void DeclPrinter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1136   prettyPrintPragmas(D->getTemplatedDecl());
1137   // Print any leading template parameter lists.
1138   if (const FunctionDecl *FD = D->getTemplatedDecl()) {
1139     for (unsigned I = 0, NumTemplateParams = FD->getNumTemplateParameterLists();
1140          I < NumTemplateParams; ++I)
1141       printTemplateParameters(FD->getTemplateParameterList(I));
1142   }
1143   VisitRedeclarableTemplateDecl(D);
1144   // Declare target attribute is special one, natural spelling for the pragma
1145   // assumes "ending" construct so print it here.
1146   if (D->getTemplatedDecl()->hasAttr<OMPDeclareTargetDeclAttr>())
1147     Out << "#pragma omp end declare target\n";
1148 
1149   // Never print "instantiations" for deduction guides (they don't really
1150   // have them).
1151   if (PrintInstantiation &&
1152       !isa<CXXDeductionGuideDecl>(D->getTemplatedDecl())) {
1153     FunctionDecl *PrevDecl = D->getTemplatedDecl();
1154     const FunctionDecl *Def;
1155     if (PrevDecl->isDefined(Def) && Def != PrevDecl)
1156       return;
1157     for (auto *I : D->specializations())
1158       if (I->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) {
1159         if (!PrevDecl->isThisDeclarationADefinition())
1160           Out << ";\n";
1161         Indent();
1162         prettyPrintPragmas(I);
1163         Visit(I);
1164       }
1165   }
1166 }
1167 
1168 void DeclPrinter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1169   VisitRedeclarableTemplateDecl(D);
1170 
1171   if (PrintInstantiation) {
1172     for (auto *I : D->specializations())
1173       if (I->getSpecializationKind() == TSK_ImplicitInstantiation) {
1174         if (D->isThisDeclarationADefinition())
1175           Out << ";";
1176         Out << "\n";
1177         Visit(I);
1178       }
1179   }
1180 }
1181 
1182 void DeclPrinter::VisitClassTemplateSpecializationDecl(
1183                                            ClassTemplateSpecializationDecl *D) {
1184   Out << "template<> ";
1185   VisitCXXRecordDecl(D);
1186 }
1187 
1188 void DeclPrinter::VisitClassTemplatePartialSpecializationDecl(
1189                                     ClassTemplatePartialSpecializationDecl *D) {
1190   printTemplateParameters(D->getTemplateParameters());
1191   VisitCXXRecordDecl(D);
1192 }
1193 
1194 //----------------------------------------------------------------------------
1195 // Objective-C declarations
1196 //----------------------------------------------------------------------------
1197 
1198 void DeclPrinter::PrintObjCMethodType(ASTContext &Ctx,
1199                                       Decl::ObjCDeclQualifier Quals,
1200                                       QualType T) {
1201   Out << '(';
1202   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_In)
1203     Out << "in ";
1204   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Inout)
1205     Out << "inout ";
1206   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Out)
1207     Out << "out ";
1208   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Bycopy)
1209     Out << "bycopy ";
1210   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Byref)
1211     Out << "byref ";
1212   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Oneway)
1213     Out << "oneway ";
1214   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_CSNullability) {
1215     if (auto nullability = AttributedType::stripOuterNullability(T))
1216       Out << getNullabilitySpelling(*nullability, true) << ' ';
1217   }
1218 
1219   Out << Ctx.getUnqualifiedObjCPointerType(T).getAsString(Policy);
1220   Out << ')';
1221 }
1222 
1223 void DeclPrinter::PrintObjCTypeParams(ObjCTypeParamList *Params) {
1224   Out << "<";
1225   unsigned First = true;
1226   for (auto *Param : *Params) {
1227     if (First) {
1228       First = false;
1229     } else {
1230       Out << ", ";
1231     }
1232 
1233     switch (Param->getVariance()) {
1234     case ObjCTypeParamVariance::Invariant:
1235       break;
1236 
1237     case ObjCTypeParamVariance::Covariant:
1238       Out << "__covariant ";
1239       break;
1240 
1241     case ObjCTypeParamVariance::Contravariant:
1242       Out << "__contravariant ";
1243       break;
1244     }
1245 
1246     Out << Param->getDeclName().getAsString();
1247 
1248     if (Param->hasExplicitBound()) {
1249       Out << " : " << Param->getUnderlyingType().getAsString(Policy);
1250     }
1251   }
1252   Out << ">";
1253 }
1254 
1255 void DeclPrinter::VisitObjCMethodDecl(ObjCMethodDecl *OMD) {
1256   if (OMD->isInstanceMethod())
1257     Out << "- ";
1258   else
1259     Out << "+ ";
1260   if (!OMD->getReturnType().isNull()) {
1261     PrintObjCMethodType(OMD->getASTContext(), OMD->getObjCDeclQualifier(),
1262                         OMD->getReturnType());
1263   }
1264 
1265   std::string name = OMD->getSelector().getAsString();
1266   std::string::size_type pos, lastPos = 0;
1267   for (const auto *PI : OMD->parameters()) {
1268     // FIXME: selector is missing here!
1269     pos = name.find_first_of(':', lastPos);
1270     if (lastPos != 0)
1271       Out << " ";
1272     Out << name.substr(lastPos, pos - lastPos) << ':';
1273     PrintObjCMethodType(OMD->getASTContext(),
1274                         PI->getObjCDeclQualifier(),
1275                         PI->getType());
1276     Out << *PI;
1277     lastPos = pos + 1;
1278   }
1279 
1280   if (OMD->param_begin() == OMD->param_end())
1281     Out << name;
1282 
1283   if (OMD->isVariadic())
1284       Out << ", ...";
1285 
1286   prettyPrintAttributes(OMD);
1287 
1288   if (OMD->getBody() && !Policy.TerseOutput) {
1289     Out << ' ';
1290     OMD->getBody()->printPretty(Out, nullptr, Policy);
1291   }
1292   else if (Policy.PolishForDeclaration)
1293     Out << ';';
1294 }
1295 
1296 void DeclPrinter::VisitObjCImplementationDecl(ObjCImplementationDecl *OID) {
1297   std::string I = OID->getNameAsString();
1298   ObjCInterfaceDecl *SID = OID->getSuperClass();
1299 
1300   bool eolnOut = false;
1301   if (SID)
1302     Out << "@implementation " << I << " : " << *SID;
1303   else
1304     Out << "@implementation " << I;
1305 
1306   if (OID->ivar_size() > 0) {
1307     Out << "{\n";
1308     eolnOut = true;
1309     Indentation += Policy.Indentation;
1310     for (const auto *I : OID->ivars()) {
1311       Indent() << I->getASTContext().getUnqualifiedObjCPointerType(I->getType()).
1312                     getAsString(Policy) << ' ' << *I << ";\n";
1313     }
1314     Indentation -= Policy.Indentation;
1315     Out << "}\n";
1316   }
1317   else if (SID || (OID->decls_begin() != OID->decls_end())) {
1318     Out << "\n";
1319     eolnOut = true;
1320   }
1321   VisitDeclContext(OID, false);
1322   if (!eolnOut)
1323     Out << "\n";
1324   Out << "@end";
1325 }
1326 
1327 void DeclPrinter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *OID) {
1328   std::string I = OID->getNameAsString();
1329   ObjCInterfaceDecl *SID = OID->getSuperClass();
1330 
1331   if (!OID->isThisDeclarationADefinition()) {
1332     Out << "@class " << I;
1333 
1334     if (auto TypeParams = OID->getTypeParamListAsWritten()) {
1335       PrintObjCTypeParams(TypeParams);
1336     }
1337 
1338     Out << ";";
1339     return;
1340   }
1341   bool eolnOut = false;
1342   Out << "@interface " << I;
1343 
1344   if (auto TypeParams = OID->getTypeParamListAsWritten()) {
1345     PrintObjCTypeParams(TypeParams);
1346   }
1347 
1348   if (SID)
1349     Out << " : " << QualType(OID->getSuperClassType(), 0).getAsString(Policy);
1350 
1351   // Protocols?
1352   const ObjCList<ObjCProtocolDecl> &Protocols = OID->getReferencedProtocols();
1353   if (!Protocols.empty()) {
1354     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
1355          E = Protocols.end(); I != E; ++I)
1356       Out << (I == Protocols.begin() ? '<' : ',') << **I;
1357     Out << "> ";
1358   }
1359 
1360   if (OID->ivar_size() > 0) {
1361     Out << "{\n";
1362     eolnOut = true;
1363     Indentation += Policy.Indentation;
1364     for (const auto *I : OID->ivars()) {
1365       Indent() << I->getASTContext()
1366                       .getUnqualifiedObjCPointerType(I->getType())
1367                       .getAsString(Policy) << ' ' << *I << ";\n";
1368     }
1369     Indentation -= Policy.Indentation;
1370     Out << "}\n";
1371   }
1372   else if (SID || (OID->decls_begin() != OID->decls_end())) {
1373     Out << "\n";
1374     eolnOut = true;
1375   }
1376 
1377   VisitDeclContext(OID, false);
1378   if (!eolnOut)
1379     Out << "\n";
1380   Out << "@end";
1381   // FIXME: implement the rest...
1382 }
1383 
1384 void DeclPrinter::VisitObjCProtocolDecl(ObjCProtocolDecl *PID) {
1385   if (!PID->isThisDeclarationADefinition()) {
1386     Out << "@protocol " << *PID << ";\n";
1387     return;
1388   }
1389   // Protocols?
1390   const ObjCList<ObjCProtocolDecl> &Protocols = PID->getReferencedProtocols();
1391   if (!Protocols.empty()) {
1392     Out << "@protocol " << *PID;
1393     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
1394          E = Protocols.end(); I != E; ++I)
1395       Out << (I == Protocols.begin() ? '<' : ',') << **I;
1396     Out << ">\n";
1397   } else
1398     Out << "@protocol " << *PID << '\n';
1399   VisitDeclContext(PID, false);
1400   Out << "@end";
1401 }
1402 
1403 void DeclPrinter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *PID) {
1404   Out << "@implementation " << *PID->getClassInterface() << '(' << *PID <<")\n";
1405 
1406   VisitDeclContext(PID, false);
1407   Out << "@end";
1408   // FIXME: implement the rest...
1409 }
1410 
1411 void DeclPrinter::VisitObjCCategoryDecl(ObjCCategoryDecl *PID) {
1412   Out << "@interface " << *PID->getClassInterface();
1413   if (auto TypeParams = PID->getTypeParamList()) {
1414     PrintObjCTypeParams(TypeParams);
1415   }
1416   Out << "(" << *PID << ")\n";
1417   if (PID->ivar_size() > 0) {
1418     Out << "{\n";
1419     Indentation += Policy.Indentation;
1420     for (const auto *I : PID->ivars())
1421       Indent() << I->getASTContext().getUnqualifiedObjCPointerType(I->getType()).
1422                     getAsString(Policy) << ' ' << *I << ";\n";
1423     Indentation -= Policy.Indentation;
1424     Out << "}\n";
1425   }
1426 
1427   VisitDeclContext(PID, false);
1428   Out << "@end";
1429 
1430   // FIXME: implement the rest...
1431 }
1432 
1433 void DeclPrinter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *AID) {
1434   Out << "@compatibility_alias " << *AID
1435       << ' ' << *AID->getClassInterface() << ";\n";
1436 }
1437 
1438 /// PrintObjCPropertyDecl - print a property declaration.
1439 ///
1440 /// Print attributes in the following order:
1441 /// - class
1442 /// - nonatomic | atomic
1443 /// - assign | retain | strong | copy | weak | unsafe_unretained
1444 /// - readwrite | readonly
1445 /// - getter & setter
1446 /// - nullability
1447 void DeclPrinter::VisitObjCPropertyDecl(ObjCPropertyDecl *PDecl) {
1448   if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Required)
1449     Out << "@required\n";
1450   else if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Optional)
1451     Out << "@optional\n";
1452 
1453   QualType T = PDecl->getType();
1454 
1455   Out << "@property";
1456   if (PDecl->getPropertyAttributes() != ObjCPropertyDecl::OBJC_PR_noattr) {
1457     bool first = true;
1458     Out << "(";
1459     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_class) {
1460       Out << (first ? "" : ", ") << "class";
1461       first = false;
1462     }
1463 
1464     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_direct) {
1465       Out << (first ? "" : ", ") << "direct";
1466       first = false;
1467     }
1468 
1469     if (PDecl->getPropertyAttributes() &
1470         ObjCPropertyDecl::OBJC_PR_nonatomic) {
1471       Out << (first ? "" : ", ") << "nonatomic";
1472       first = false;
1473     }
1474     if (PDecl->getPropertyAttributes() &
1475         ObjCPropertyDecl::OBJC_PR_atomic) {
1476       Out << (first ? "" : ", ") << "atomic";
1477       first = false;
1478     }
1479 
1480     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_assign) {
1481       Out << (first ? "" : ", ") << "assign";
1482       first = false;
1483     }
1484     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_retain) {
1485       Out << (first ? "" : ", ") << "retain";
1486       first = false;
1487     }
1488 
1489     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_strong) {
1490       Out << (first ? "" : ", ") << "strong";
1491       first = false;
1492     }
1493     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_copy) {
1494       Out << (first ? "" : ", ") << "copy";
1495       first = false;
1496     }
1497     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak) {
1498       Out << (first ? "" : ", ") << "weak";
1499       first = false;
1500     }
1501     if (PDecl->getPropertyAttributes()
1502         & ObjCPropertyDecl::OBJC_PR_unsafe_unretained) {
1503       Out << (first ? "" : ", ") << "unsafe_unretained";
1504       first = false;
1505     }
1506 
1507     if (PDecl->getPropertyAttributes() &
1508         ObjCPropertyDecl::OBJC_PR_readwrite) {
1509       Out << (first ? "" : ", ") << "readwrite";
1510       first = false;
1511     }
1512     if (PDecl->getPropertyAttributes() &
1513         ObjCPropertyDecl::OBJC_PR_readonly) {
1514       Out << (first ? "" : ", ") << "readonly";
1515       first = false;
1516     }
1517 
1518     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) {
1519       Out << (first ? "" : ", ") << "getter = ";
1520       PDecl->getGetterName().print(Out);
1521       first = false;
1522     }
1523     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) {
1524       Out << (first ? "" : ", ") << "setter = ";
1525       PDecl->getSetterName().print(Out);
1526       first = false;
1527     }
1528 
1529     if (PDecl->getPropertyAttributes() &
1530         ObjCPropertyDecl::OBJC_PR_nullability) {
1531       if (auto nullability = AttributedType::stripOuterNullability(T)) {
1532         if (*nullability == NullabilityKind::Unspecified &&
1533             (PDecl->getPropertyAttributes() &
1534                ObjCPropertyDecl::OBJC_PR_null_resettable)) {
1535           Out << (first ? "" : ", ") << "null_resettable";
1536         } else {
1537           Out << (first ? "" : ", ")
1538               << getNullabilitySpelling(*nullability, true);
1539         }
1540         first = false;
1541       }
1542     }
1543 
1544     (void) first; // Silence dead store warning due to idiomatic code.
1545     Out << ")";
1546   }
1547   std::string TypeStr = PDecl->getASTContext().getUnqualifiedObjCPointerType(T).
1548       getAsString(Policy);
1549   Out << ' ' << TypeStr;
1550   if (!StringRef(TypeStr).endswith("*"))
1551     Out << ' ';
1552   Out << *PDecl;
1553   if (Policy.PolishForDeclaration)
1554     Out << ';';
1555 }
1556 
1557 void DeclPrinter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *PID) {
1558   if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize)
1559     Out << "@synthesize ";
1560   else
1561     Out << "@dynamic ";
1562   Out << *PID->getPropertyDecl();
1563   if (PID->getPropertyIvarDecl())
1564     Out << '=' << *PID->getPropertyIvarDecl();
1565 }
1566 
1567 void DeclPrinter::VisitUsingDecl(UsingDecl *D) {
1568   if (!D->isAccessDeclaration())
1569     Out << "using ";
1570   if (D->hasTypename())
1571     Out << "typename ";
1572   D->getQualifier()->print(Out, Policy);
1573 
1574   // Use the correct record name when the using declaration is used for
1575   // inheriting constructors.
1576   for (const auto *Shadow : D->shadows()) {
1577     if (const auto *ConstructorShadow =
1578             dyn_cast<ConstructorUsingShadowDecl>(Shadow)) {
1579       assert(Shadow->getDeclContext() == ConstructorShadow->getDeclContext());
1580       Out << *ConstructorShadow->getNominatedBaseClass();
1581       return;
1582     }
1583   }
1584   Out << *D;
1585 }
1586 
1587 void
1588 DeclPrinter::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) {
1589   Out << "using typename ";
1590   D->getQualifier()->print(Out, Policy);
1591   Out << D->getDeclName();
1592 }
1593 
1594 void DeclPrinter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1595   if (!D->isAccessDeclaration())
1596     Out << "using ";
1597   D->getQualifier()->print(Out, Policy);
1598   Out << D->getDeclName();
1599 }
1600 
1601 void DeclPrinter::VisitUsingShadowDecl(UsingShadowDecl *D) {
1602   // ignore
1603 }
1604 
1605 void DeclPrinter::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
1606   Out << "#pragma omp threadprivate";
1607   if (!D->varlist_empty()) {
1608     for (OMPThreadPrivateDecl::varlist_iterator I = D->varlist_begin(),
1609                                                 E = D->varlist_end();
1610                                                 I != E; ++I) {
1611       Out << (I == D->varlist_begin() ? '(' : ',');
1612       NamedDecl *ND = cast<DeclRefExpr>(*I)->getDecl();
1613       ND->printQualifiedName(Out);
1614     }
1615     Out << ")";
1616   }
1617 }
1618 
1619 void DeclPrinter::VisitOMPAllocateDecl(OMPAllocateDecl *D) {
1620   Out << "#pragma omp allocate";
1621   if (!D->varlist_empty()) {
1622     for (OMPAllocateDecl::varlist_iterator I = D->varlist_begin(),
1623                                            E = D->varlist_end();
1624          I != E; ++I) {
1625       Out << (I == D->varlist_begin() ? '(' : ',');
1626       NamedDecl *ND = cast<DeclRefExpr>(*I)->getDecl();
1627       ND->printQualifiedName(Out);
1628     }
1629     Out << ")";
1630   }
1631   if (!D->clauselist_empty()) {
1632     Out << " ";
1633     OMPClausePrinter Printer(Out, Policy);
1634     for (OMPClause *C : D->clauselists())
1635       Printer.Visit(C);
1636   }
1637 }
1638 
1639 void DeclPrinter::VisitOMPRequiresDecl(OMPRequiresDecl *D) {
1640   Out << "#pragma omp requires ";
1641   if (!D->clauselist_empty()) {
1642     OMPClausePrinter Printer(Out, Policy);
1643     for (auto I = D->clauselist_begin(), E = D->clauselist_end(); I != E; ++I)
1644       Printer.Visit(*I);
1645   }
1646 }
1647 
1648 void DeclPrinter::VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D) {
1649   if (!D->isInvalidDecl()) {
1650     Out << "#pragma omp declare reduction (";
1651     if (D->getDeclName().getNameKind() == DeclarationName::CXXOperatorName) {
1652       const char *OpName =
1653           getOperatorSpelling(D->getDeclName().getCXXOverloadedOperator());
1654       assert(OpName && "not an overloaded operator");
1655       Out << OpName;
1656     } else {
1657       assert(D->getDeclName().isIdentifier());
1658       D->printName(Out);
1659     }
1660     Out << " : ";
1661     D->getType().print(Out, Policy);
1662     Out << " : ";
1663     D->getCombiner()->printPretty(Out, nullptr, Policy, 0);
1664     Out << ")";
1665     if (auto *Init = D->getInitializer()) {
1666       Out << " initializer(";
1667       switch (D->getInitializerKind()) {
1668       case OMPDeclareReductionDecl::DirectInit:
1669         Out << "omp_priv(";
1670         break;
1671       case OMPDeclareReductionDecl::CopyInit:
1672         Out << "omp_priv = ";
1673         break;
1674       case OMPDeclareReductionDecl::CallInit:
1675         break;
1676       }
1677       Init->printPretty(Out, nullptr, Policy, 0);
1678       if (D->getInitializerKind() == OMPDeclareReductionDecl::DirectInit)
1679         Out << ")";
1680       Out << ")";
1681     }
1682   }
1683 }
1684 
1685 void DeclPrinter::VisitOMPDeclareMapperDecl(OMPDeclareMapperDecl *D) {
1686   if (!D->isInvalidDecl()) {
1687     Out << "#pragma omp declare mapper (";
1688     D->printName(Out);
1689     Out << " : ";
1690     D->getType().print(Out, Policy);
1691     Out << " ";
1692     Out << D->getVarName();
1693     Out << ")";
1694     if (!D->clauselist_empty()) {
1695       OMPClausePrinter Printer(Out, Policy);
1696       for (auto *C : D->clauselists()) {
1697         Out << " ";
1698         Printer.Visit(C);
1699       }
1700     }
1701   }
1702 }
1703 
1704 void DeclPrinter::VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D) {
1705   D->getInit()->printPretty(Out, nullptr, Policy, Indentation);
1706 }
1707 
1708