xref: /freebsd/contrib/llvm-project/clang/lib/AST/DeclPrinter.cpp (revision a521f2116473fbd8c09db395518f060a27d02334) 
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     void VisitTemplateTypeParmDecl(const TemplateTypeParmDecl *TTP);
109     void VisitNonTypeTemplateParmDecl(const NonTypeTemplateParmDecl *NTTP);
110 
111     void printTemplateParameters(const TemplateParameterList *Params,
112                                  bool OmitTemplateKW = false);
113     void printTemplateArguments(llvm::ArrayRef<TemplateArgument> Args);
114     void printTemplateArguments(llvm::ArrayRef<TemplateArgumentLoc> Args);
115     void prettyPrintAttributes(Decl *D);
116     void prettyPrintPragmas(Decl *D);
117     void printDeclType(QualType T, StringRef DeclName, bool Pack = false);
118   };
119 }
120 
121 void Decl::print(raw_ostream &Out, unsigned Indentation,
122                  bool PrintInstantiation) const {
123   print(Out, getASTContext().getPrintingPolicy(), Indentation, PrintInstantiation);
124 }
125 
126 void Decl::print(raw_ostream &Out, const PrintingPolicy &Policy,
127                  unsigned Indentation, bool PrintInstantiation) const {
128   DeclPrinter Printer(Out, Policy, getASTContext(), Indentation,
129                       PrintInstantiation);
130   Printer.Visit(const_cast<Decl*>(this));
131 }
132 
133 void TemplateParameterList::print(raw_ostream &Out, const ASTContext &Context,
134                                   bool OmitTemplateKW) const {
135   print(Out, Context, Context.getPrintingPolicy(), OmitTemplateKW);
136 }
137 
138 void TemplateParameterList::print(raw_ostream &Out, const ASTContext &Context,
139                                   const PrintingPolicy &Policy,
140                                   bool OmitTemplateKW) const {
141   DeclPrinter Printer(Out, Policy, Context);
142   Printer.printTemplateParameters(this, OmitTemplateKW);
143 }
144 
145 static QualType GetBaseType(QualType T) {
146   // FIXME: This should be on the Type class!
147   QualType BaseType = T;
148   while (!BaseType->isSpecifierType()) {
149     if (const PointerType *PTy = BaseType->getAs<PointerType>())
150       BaseType = PTy->getPointeeType();
151     else if (const BlockPointerType *BPy = BaseType->getAs<BlockPointerType>())
152       BaseType = BPy->getPointeeType();
153     else if (const ArrayType* ATy = dyn_cast<ArrayType>(BaseType))
154       BaseType = ATy->getElementType();
155     else if (const FunctionType* FTy = BaseType->getAs<FunctionType>())
156       BaseType = FTy->getReturnType();
157     else if (const VectorType *VTy = BaseType->getAs<VectorType>())
158       BaseType = VTy->getElementType();
159     else if (const ReferenceType *RTy = BaseType->getAs<ReferenceType>())
160       BaseType = RTy->getPointeeType();
161     else if (const AutoType *ATy = BaseType->getAs<AutoType>())
162       BaseType = ATy->getDeducedType();
163     else if (const ParenType *PTy = BaseType->getAs<ParenType>())
164       BaseType = PTy->desugar();
165     else
166       // This must be a syntax error.
167       break;
168   }
169   return BaseType;
170 }
171 
172 static QualType getDeclType(Decl* D) {
173   if (TypedefNameDecl* TDD = dyn_cast<TypedefNameDecl>(D))
174     return TDD->getUnderlyingType();
175   if (ValueDecl* VD = dyn_cast<ValueDecl>(D))
176     return VD->getType();
177   return QualType();
178 }
179 
180 void Decl::printGroup(Decl** Begin, unsigned NumDecls,
181                       raw_ostream &Out, const PrintingPolicy &Policy,
182                       unsigned Indentation) {
183   if (NumDecls == 1) {
184     (*Begin)->print(Out, Policy, Indentation);
185     return;
186   }
187 
188   Decl** End = Begin + NumDecls;
189   TagDecl* TD = dyn_cast<TagDecl>(*Begin);
190   if (TD)
191     ++Begin;
192 
193   PrintingPolicy SubPolicy(Policy);
194 
195   bool isFirst = true;
196   for ( ; Begin != End; ++Begin) {
197     if (isFirst) {
198       if(TD)
199         SubPolicy.IncludeTagDefinition = true;
200       SubPolicy.SuppressSpecifiers = false;
201       isFirst = false;
202     } else {
203       if (!isFirst) Out << ", ";
204       SubPolicy.IncludeTagDefinition = false;
205       SubPolicy.SuppressSpecifiers = true;
206     }
207 
208     (*Begin)->print(Out, SubPolicy, Indentation);
209   }
210 }
211 
212 LLVM_DUMP_METHOD void DeclContext::dumpDeclContext() const {
213   // Get the translation unit
214   const DeclContext *DC = this;
215   while (!DC->isTranslationUnit())
216     DC = DC->getParent();
217 
218   ASTContext &Ctx = cast<TranslationUnitDecl>(DC)->getASTContext();
219   DeclPrinter Printer(llvm::errs(), Ctx.getPrintingPolicy(), Ctx, 0);
220   Printer.VisitDeclContext(const_cast<DeclContext *>(this), /*Indent=*/false);
221 }
222 
223 raw_ostream& DeclPrinter::Indent(unsigned Indentation) {
224   for (unsigned i = 0; i != Indentation; ++i)
225     Out << "  ";
226   return Out;
227 }
228 
229 void DeclPrinter::prettyPrintAttributes(Decl *D) {
230   if (Policy.PolishForDeclaration)
231     return;
232 
233   if (D->hasAttrs()) {
234     AttrVec &Attrs = D->getAttrs();
235     for (auto *A : Attrs) {
236       if (A->isInherited() || A->isImplicit())
237         continue;
238       switch (A->getKind()) {
239 #define ATTR(X)
240 #define PRAGMA_SPELLING_ATTR(X) case attr::X:
241 #include "clang/Basic/AttrList.inc"
242         break;
243       default:
244         A->printPretty(Out, Policy);
245         break;
246       }
247     }
248   }
249 }
250 
251 void DeclPrinter::prettyPrintPragmas(Decl *D) {
252   if (Policy.PolishForDeclaration)
253     return;
254 
255   if (D->hasAttrs()) {
256     AttrVec &Attrs = D->getAttrs();
257     for (auto *A : Attrs) {
258       switch (A->getKind()) {
259 #define ATTR(X)
260 #define PRAGMA_SPELLING_ATTR(X) case attr::X:
261 #include "clang/Basic/AttrList.inc"
262         A->printPretty(Out, Policy);
263         Indent();
264         break;
265       default:
266         break;
267       }
268     }
269   }
270 }
271 
272 void DeclPrinter::printDeclType(QualType T, StringRef DeclName, bool Pack) {
273   // Normally, a PackExpansionType is written as T[3]... (for instance, as a
274   // template argument), but if it is the type of a declaration, the ellipsis
275   // is placed before the name being declared.
276   if (auto *PET = T->getAs<PackExpansionType>()) {
277     Pack = true;
278     T = PET->getPattern();
279   }
280   T.print(Out, Policy, (Pack ? "..." : "") + DeclName, Indentation);
281 }
282 
283 void DeclPrinter::ProcessDeclGroup(SmallVectorImpl<Decl*>& Decls) {
284   this->Indent();
285   Decl::printGroup(Decls.data(), Decls.size(), Out, Policy, Indentation);
286   Out << ";\n";
287   Decls.clear();
288 
289 }
290 
291 void DeclPrinter::Print(AccessSpecifier AS) {
292   const auto AccessSpelling = getAccessSpelling(AS);
293   if (AccessSpelling.empty())
294     llvm_unreachable("No access specifier!");
295   Out << AccessSpelling;
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())
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 (const auto *TTP = dyn_cast<TemplateTypeParmDecl>(Param)) {
1055       VisitTemplateTypeParmDecl(TTP);
1056     } else if (auto NTTP = dyn_cast<NonTypeTemplateParmDecl>(Param)) {
1057       VisitNonTypeTemplateParmDecl(NTTP);
1058     } else if (auto TTPD = dyn_cast<TemplateTemplateParmDecl>(Param)) {
1059       VisitTemplateDecl(TTPD);
1060       // FIXME: print the default argument, if present.
1061     }
1062   }
1063 
1064   Out << '>';
1065   if (!OmitTemplateKW)
1066     Out << ' ';
1067 }
1068 
1069 void DeclPrinter::printTemplateArguments(ArrayRef<TemplateArgument> Args) {
1070   Out << "<";
1071   for (size_t I = 0, E = Args.size(); I < E; ++I) {
1072     if (I)
1073       Out << ", ";
1074     Args[I].print(Policy, Out);
1075   }
1076   Out << ">";
1077 }
1078 
1079 void DeclPrinter::printTemplateArguments(ArrayRef<TemplateArgumentLoc> Args) {
1080   Out << "<";
1081   for (size_t I = 0, E = Args.size(); I < E; ++I) {
1082     if (I)
1083       Out << ", ";
1084     Args[I].getArgument().print(Policy, Out);
1085   }
1086   Out << ">";
1087 }
1088 
1089 void DeclPrinter::VisitTemplateDecl(const TemplateDecl *D) {
1090   printTemplateParameters(D->getTemplateParameters());
1091 
1092   if (const TemplateTemplateParmDecl *TTP =
1093         dyn_cast<TemplateTemplateParmDecl>(D)) {
1094     Out << "class ";
1095     if (TTP->isParameterPack())
1096       Out << "...";
1097     Out << D->getName();
1098   } else if (auto *TD = D->getTemplatedDecl())
1099     Visit(TD);
1100   else if (const auto *Concept = dyn_cast<ConceptDecl>(D)) {
1101     Out << "concept " << Concept->getName() << " = " ;
1102     Concept->getConstraintExpr()->printPretty(Out, nullptr, Policy,
1103                                               Indentation);
1104     Out << ";";
1105   }
1106 }
1107 
1108 void DeclPrinter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1109   prettyPrintPragmas(D->getTemplatedDecl());
1110   // Print any leading template parameter lists.
1111   if (const FunctionDecl *FD = D->getTemplatedDecl()) {
1112     for (unsigned I = 0, NumTemplateParams = FD->getNumTemplateParameterLists();
1113          I < NumTemplateParams; ++I)
1114       printTemplateParameters(FD->getTemplateParameterList(I));
1115   }
1116   VisitRedeclarableTemplateDecl(D);
1117   // Declare target attribute is special one, natural spelling for the pragma
1118   // assumes "ending" construct so print it here.
1119   if (D->getTemplatedDecl()->hasAttr<OMPDeclareTargetDeclAttr>())
1120     Out << "#pragma omp end declare target\n";
1121 
1122   // Never print "instantiations" for deduction guides (they don't really
1123   // have them).
1124   if (PrintInstantiation &&
1125       !isa<CXXDeductionGuideDecl>(D->getTemplatedDecl())) {
1126     FunctionDecl *PrevDecl = D->getTemplatedDecl();
1127     const FunctionDecl *Def;
1128     if (PrevDecl->isDefined(Def) && Def != PrevDecl)
1129       return;
1130     for (auto *I : D->specializations())
1131       if (I->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) {
1132         if (!PrevDecl->isThisDeclarationADefinition())
1133           Out << ";\n";
1134         Indent();
1135         prettyPrintPragmas(I);
1136         Visit(I);
1137       }
1138   }
1139 }
1140 
1141 void DeclPrinter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1142   VisitRedeclarableTemplateDecl(D);
1143 
1144   if (PrintInstantiation) {
1145     for (auto *I : D->specializations())
1146       if (I->getSpecializationKind() == TSK_ImplicitInstantiation) {
1147         if (D->isThisDeclarationADefinition())
1148           Out << ";";
1149         Out << "\n";
1150         Visit(I);
1151       }
1152   }
1153 }
1154 
1155 void DeclPrinter::VisitClassTemplateSpecializationDecl(
1156                                            ClassTemplateSpecializationDecl *D) {
1157   Out << "template<> ";
1158   VisitCXXRecordDecl(D);
1159 }
1160 
1161 void DeclPrinter::VisitClassTemplatePartialSpecializationDecl(
1162                                     ClassTemplatePartialSpecializationDecl *D) {
1163   printTemplateParameters(D->getTemplateParameters());
1164   VisitCXXRecordDecl(D);
1165 }
1166 
1167 //----------------------------------------------------------------------------
1168 // Objective-C declarations
1169 //----------------------------------------------------------------------------
1170 
1171 void DeclPrinter::PrintObjCMethodType(ASTContext &Ctx,
1172                                       Decl::ObjCDeclQualifier Quals,
1173                                       QualType T) {
1174   Out << '(';
1175   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_In)
1176     Out << "in ";
1177   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Inout)
1178     Out << "inout ";
1179   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Out)
1180     Out << "out ";
1181   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Bycopy)
1182     Out << "bycopy ";
1183   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Byref)
1184     Out << "byref ";
1185   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_Oneway)
1186     Out << "oneway ";
1187   if (Quals & Decl::ObjCDeclQualifier::OBJC_TQ_CSNullability) {
1188     if (auto nullability = AttributedType::stripOuterNullability(T))
1189       Out << getNullabilitySpelling(*nullability, true) << ' ';
1190   }
1191 
1192   Out << Ctx.getUnqualifiedObjCPointerType(T).getAsString(Policy);
1193   Out << ')';
1194 }
1195 
1196 void DeclPrinter::PrintObjCTypeParams(ObjCTypeParamList *Params) {
1197   Out << "<";
1198   unsigned First = true;
1199   for (auto *Param : *Params) {
1200     if (First) {
1201       First = false;
1202     } else {
1203       Out << ", ";
1204     }
1205 
1206     switch (Param->getVariance()) {
1207     case ObjCTypeParamVariance::Invariant:
1208       break;
1209 
1210     case ObjCTypeParamVariance::Covariant:
1211       Out << "__covariant ";
1212       break;
1213 
1214     case ObjCTypeParamVariance::Contravariant:
1215       Out << "__contravariant ";
1216       break;
1217     }
1218 
1219     Out << Param->getDeclName().getAsString();
1220 
1221     if (Param->hasExplicitBound()) {
1222       Out << " : " << Param->getUnderlyingType().getAsString(Policy);
1223     }
1224   }
1225   Out << ">";
1226 }
1227 
1228 void DeclPrinter::VisitObjCMethodDecl(ObjCMethodDecl *OMD) {
1229   if (OMD->isInstanceMethod())
1230     Out << "- ";
1231   else
1232     Out << "+ ";
1233   if (!OMD->getReturnType().isNull()) {
1234     PrintObjCMethodType(OMD->getASTContext(), OMD->getObjCDeclQualifier(),
1235                         OMD->getReturnType());
1236   }
1237 
1238   std::string name = OMD->getSelector().getAsString();
1239   std::string::size_type pos, lastPos = 0;
1240   for (const auto *PI : OMD->parameters()) {
1241     // FIXME: selector is missing here!
1242     pos = name.find_first_of(':', lastPos);
1243     if (lastPos != 0)
1244       Out << " ";
1245     Out << name.substr(lastPos, pos - lastPos) << ':';
1246     PrintObjCMethodType(OMD->getASTContext(),
1247                         PI->getObjCDeclQualifier(),
1248                         PI->getType());
1249     Out << *PI;
1250     lastPos = pos + 1;
1251   }
1252 
1253   if (OMD->param_begin() == OMD->param_end())
1254     Out << name;
1255 
1256   if (OMD->isVariadic())
1257       Out << ", ...";
1258 
1259   prettyPrintAttributes(OMD);
1260 
1261   if (OMD->getBody() && !Policy.TerseOutput) {
1262     Out << ' ';
1263     OMD->getBody()->printPretty(Out, nullptr, Policy);
1264   }
1265   else if (Policy.PolishForDeclaration)
1266     Out << ';';
1267 }
1268 
1269 void DeclPrinter::VisitObjCImplementationDecl(ObjCImplementationDecl *OID) {
1270   std::string I = OID->getNameAsString();
1271   ObjCInterfaceDecl *SID = OID->getSuperClass();
1272 
1273   bool eolnOut = false;
1274   if (SID)
1275     Out << "@implementation " << I << " : " << *SID;
1276   else
1277     Out << "@implementation " << I;
1278 
1279   if (OID->ivar_size() > 0) {
1280     Out << "{\n";
1281     eolnOut = true;
1282     Indentation += Policy.Indentation;
1283     for (const auto *I : OID->ivars()) {
1284       Indent() << I->getASTContext().getUnqualifiedObjCPointerType(I->getType()).
1285                     getAsString(Policy) << ' ' << *I << ";\n";
1286     }
1287     Indentation -= Policy.Indentation;
1288     Out << "}\n";
1289   }
1290   else if (SID || (OID->decls_begin() != OID->decls_end())) {
1291     Out << "\n";
1292     eolnOut = true;
1293   }
1294   VisitDeclContext(OID, false);
1295   if (!eolnOut)
1296     Out << "\n";
1297   Out << "@end";
1298 }
1299 
1300 void DeclPrinter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *OID) {
1301   std::string I = OID->getNameAsString();
1302   ObjCInterfaceDecl *SID = OID->getSuperClass();
1303 
1304   if (!OID->isThisDeclarationADefinition()) {
1305     Out << "@class " << I;
1306 
1307     if (auto TypeParams = OID->getTypeParamListAsWritten()) {
1308       PrintObjCTypeParams(TypeParams);
1309     }
1310 
1311     Out << ";";
1312     return;
1313   }
1314   bool eolnOut = false;
1315   Out << "@interface " << I;
1316 
1317   if (auto TypeParams = OID->getTypeParamListAsWritten()) {
1318     PrintObjCTypeParams(TypeParams);
1319   }
1320 
1321   if (SID)
1322     Out << " : " << QualType(OID->getSuperClassType(), 0).getAsString(Policy);
1323 
1324   // Protocols?
1325   const ObjCList<ObjCProtocolDecl> &Protocols = OID->getReferencedProtocols();
1326   if (!Protocols.empty()) {
1327     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
1328          E = Protocols.end(); I != E; ++I)
1329       Out << (I == Protocols.begin() ? '<' : ',') << **I;
1330     Out << "> ";
1331   }
1332 
1333   if (OID->ivar_size() > 0) {
1334     Out << "{\n";
1335     eolnOut = true;
1336     Indentation += Policy.Indentation;
1337     for (const auto *I : OID->ivars()) {
1338       Indent() << I->getASTContext()
1339                       .getUnqualifiedObjCPointerType(I->getType())
1340                       .getAsString(Policy) << ' ' << *I << ";\n";
1341     }
1342     Indentation -= Policy.Indentation;
1343     Out << "}\n";
1344   }
1345   else if (SID || (OID->decls_begin() != OID->decls_end())) {
1346     Out << "\n";
1347     eolnOut = true;
1348   }
1349 
1350   VisitDeclContext(OID, false);
1351   if (!eolnOut)
1352     Out << "\n";
1353   Out << "@end";
1354   // FIXME: implement the rest...
1355 }
1356 
1357 void DeclPrinter::VisitObjCProtocolDecl(ObjCProtocolDecl *PID) {
1358   if (!PID->isThisDeclarationADefinition()) {
1359     Out << "@protocol " << *PID << ";\n";
1360     return;
1361   }
1362   // Protocols?
1363   const ObjCList<ObjCProtocolDecl> &Protocols = PID->getReferencedProtocols();
1364   if (!Protocols.empty()) {
1365     Out << "@protocol " << *PID;
1366     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
1367          E = Protocols.end(); I != E; ++I)
1368       Out << (I == Protocols.begin() ? '<' : ',') << **I;
1369     Out << ">\n";
1370   } else
1371     Out << "@protocol " << *PID << '\n';
1372   VisitDeclContext(PID, false);
1373   Out << "@end";
1374 }
1375 
1376 void DeclPrinter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *PID) {
1377   Out << "@implementation ";
1378   if (const auto *CID = PID->getClassInterface())
1379     Out << *CID;
1380   else
1381     Out << "<<error-type>>";
1382   Out << '(' << *PID << ")\n";
1383 
1384   VisitDeclContext(PID, false);
1385   Out << "@end";
1386   // FIXME: implement the rest...
1387 }
1388 
1389 void DeclPrinter::VisitObjCCategoryDecl(ObjCCategoryDecl *PID) {
1390   Out << "@interface ";
1391   if (const auto *CID = PID->getClassInterface())
1392     Out << *CID;
1393   else
1394     Out << "<<error-type>>";
1395   if (auto TypeParams = PID->getTypeParamList()) {
1396     PrintObjCTypeParams(TypeParams);
1397   }
1398   Out << "(" << *PID << ")\n";
1399   if (PID->ivar_size() > 0) {
1400     Out << "{\n";
1401     Indentation += Policy.Indentation;
1402     for (const auto *I : PID->ivars())
1403       Indent() << I->getASTContext().getUnqualifiedObjCPointerType(I->getType()).
1404                     getAsString(Policy) << ' ' << *I << ";\n";
1405     Indentation -= Policy.Indentation;
1406     Out << "}\n";
1407   }
1408 
1409   VisitDeclContext(PID, false);
1410   Out << "@end";
1411 
1412   // FIXME: implement the rest...
1413 }
1414 
1415 void DeclPrinter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *AID) {
1416   Out << "@compatibility_alias " << *AID
1417       << ' ' << *AID->getClassInterface() << ";\n";
1418 }
1419 
1420 /// PrintObjCPropertyDecl - print a property declaration.
1421 ///
1422 /// Print attributes in the following order:
1423 /// - class
1424 /// - nonatomic | atomic
1425 /// - assign | retain | strong | copy | weak | unsafe_unretained
1426 /// - readwrite | readonly
1427 /// - getter & setter
1428 /// - nullability
1429 void DeclPrinter::VisitObjCPropertyDecl(ObjCPropertyDecl *PDecl) {
1430   if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Required)
1431     Out << "@required\n";
1432   else if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Optional)
1433     Out << "@optional\n";
1434 
1435   QualType T = PDecl->getType();
1436 
1437   Out << "@property";
1438   if (PDecl->getPropertyAttributes() != ObjCPropertyAttribute::kind_noattr) {
1439     bool first = true;
1440     Out << "(";
1441     if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_class) {
1442       Out << (first ? "" : ", ") << "class";
1443       first = false;
1444     }
1445 
1446     if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_direct) {
1447       Out << (first ? "" : ", ") << "direct";
1448       first = false;
1449     }
1450 
1451     if (PDecl->getPropertyAttributes() &
1452         ObjCPropertyAttribute::kind_nonatomic) {
1453       Out << (first ? "" : ", ") << "nonatomic";
1454       first = false;
1455     }
1456     if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_atomic) {
1457       Out << (first ? "" : ", ") << "atomic";
1458       first = false;
1459     }
1460 
1461     if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_assign) {
1462       Out << (first ? "" : ", ") << "assign";
1463       first = false;
1464     }
1465     if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_retain) {
1466       Out << (first ? "" : ", ") << "retain";
1467       first = false;
1468     }
1469 
1470     if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_strong) {
1471       Out << (first ? "" : ", ") << "strong";
1472       first = false;
1473     }
1474     if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_copy) {
1475       Out << (first ? "" : ", ") << "copy";
1476       first = false;
1477     }
1478     if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_weak) {
1479       Out << (first ? "" : ", ") << "weak";
1480       first = false;
1481     }
1482     if (PDecl->getPropertyAttributes() &
1483         ObjCPropertyAttribute::kind_unsafe_unretained) {
1484       Out << (first ? "" : ", ") << "unsafe_unretained";
1485       first = false;
1486     }
1487 
1488     if (PDecl->getPropertyAttributes() &
1489         ObjCPropertyAttribute::kind_readwrite) {
1490       Out << (first ? "" : ", ") << "readwrite";
1491       first = false;
1492     }
1493     if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_readonly) {
1494       Out << (first ? "" : ", ") << "readonly";
1495       first = false;
1496     }
1497 
1498     if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_getter) {
1499       Out << (first ? "" : ", ") << "getter = ";
1500       PDecl->getGetterName().print(Out);
1501       first = false;
1502     }
1503     if (PDecl->getPropertyAttributes() & ObjCPropertyAttribute::kind_setter) {
1504       Out << (first ? "" : ", ") << "setter = ";
1505       PDecl->getSetterName().print(Out);
1506       first = false;
1507     }
1508 
1509     if (PDecl->getPropertyAttributes() &
1510         ObjCPropertyAttribute::kind_nullability) {
1511       if (auto nullability = AttributedType::stripOuterNullability(T)) {
1512         if (*nullability == NullabilityKind::Unspecified &&
1513             (PDecl->getPropertyAttributes() &
1514              ObjCPropertyAttribute::kind_null_resettable)) {
1515           Out << (first ? "" : ", ") << "null_resettable";
1516         } else {
1517           Out << (first ? "" : ", ")
1518               << getNullabilitySpelling(*nullability, true);
1519         }
1520         first = false;
1521       }
1522     }
1523 
1524     (void) first; // Silence dead store warning due to idiomatic code.
1525     Out << ")";
1526   }
1527   std::string TypeStr = PDecl->getASTContext().getUnqualifiedObjCPointerType(T).
1528       getAsString(Policy);
1529   Out << ' ' << TypeStr;
1530   if (!StringRef(TypeStr).endswith("*"))
1531     Out << ' ';
1532   Out << *PDecl;
1533   if (Policy.PolishForDeclaration)
1534     Out << ';';
1535 }
1536 
1537 void DeclPrinter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *PID) {
1538   if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize)
1539     Out << "@synthesize ";
1540   else
1541     Out << "@dynamic ";
1542   Out << *PID->getPropertyDecl();
1543   if (PID->getPropertyIvarDecl())
1544     Out << '=' << *PID->getPropertyIvarDecl();
1545 }
1546 
1547 void DeclPrinter::VisitUsingDecl(UsingDecl *D) {
1548   if (!D->isAccessDeclaration())
1549     Out << "using ";
1550   if (D->hasTypename())
1551     Out << "typename ";
1552   D->getQualifier()->print(Out, Policy);
1553 
1554   // Use the correct record name when the using declaration is used for
1555   // inheriting constructors.
1556   for (const auto *Shadow : D->shadows()) {
1557     if (const auto *ConstructorShadow =
1558             dyn_cast<ConstructorUsingShadowDecl>(Shadow)) {
1559       assert(Shadow->getDeclContext() == ConstructorShadow->getDeclContext());
1560       Out << *ConstructorShadow->getNominatedBaseClass();
1561       return;
1562     }
1563   }
1564   Out << *D;
1565 }
1566 
1567 void
1568 DeclPrinter::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) {
1569   Out << "using typename ";
1570   D->getQualifier()->print(Out, Policy);
1571   Out << D->getDeclName();
1572 }
1573 
1574 void DeclPrinter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1575   if (!D->isAccessDeclaration())
1576     Out << "using ";
1577   D->getQualifier()->print(Out, Policy);
1578   Out << D->getDeclName();
1579 }
1580 
1581 void DeclPrinter::VisitUsingShadowDecl(UsingShadowDecl *D) {
1582   // ignore
1583 }
1584 
1585 void DeclPrinter::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
1586   Out << "#pragma omp threadprivate";
1587   if (!D->varlist_empty()) {
1588     for (OMPThreadPrivateDecl::varlist_iterator I = D->varlist_begin(),
1589                                                 E = D->varlist_end();
1590                                                 I != E; ++I) {
1591       Out << (I == D->varlist_begin() ? '(' : ',');
1592       NamedDecl *ND = cast<DeclRefExpr>(*I)->getDecl();
1593       ND->printQualifiedName(Out);
1594     }
1595     Out << ")";
1596   }
1597 }
1598 
1599 void DeclPrinter::VisitOMPAllocateDecl(OMPAllocateDecl *D) {
1600   Out << "#pragma omp allocate";
1601   if (!D->varlist_empty()) {
1602     for (OMPAllocateDecl::varlist_iterator I = D->varlist_begin(),
1603                                            E = D->varlist_end();
1604          I != E; ++I) {
1605       Out << (I == D->varlist_begin() ? '(' : ',');
1606       NamedDecl *ND = cast<DeclRefExpr>(*I)->getDecl();
1607       ND->printQualifiedName(Out);
1608     }
1609     Out << ")";
1610   }
1611   if (!D->clauselist_empty()) {
1612     Out << " ";
1613     OMPClausePrinter Printer(Out, Policy);
1614     for (OMPClause *C : D->clauselists())
1615       Printer.Visit(C);
1616   }
1617 }
1618 
1619 void DeclPrinter::VisitOMPRequiresDecl(OMPRequiresDecl *D) {
1620   Out << "#pragma omp requires ";
1621   if (!D->clauselist_empty()) {
1622     OMPClausePrinter Printer(Out, Policy);
1623     for (auto I = D->clauselist_begin(), E = D->clauselist_end(); I != E; ++I)
1624       Printer.Visit(*I);
1625   }
1626 }
1627 
1628 void DeclPrinter::VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D) {
1629   if (!D->isInvalidDecl()) {
1630     Out << "#pragma omp declare reduction (";
1631     if (D->getDeclName().getNameKind() == DeclarationName::CXXOperatorName) {
1632       const char *OpName =
1633           getOperatorSpelling(D->getDeclName().getCXXOverloadedOperator());
1634       assert(OpName && "not an overloaded operator");
1635       Out << OpName;
1636     } else {
1637       assert(D->getDeclName().isIdentifier());
1638       D->printName(Out);
1639     }
1640     Out << " : ";
1641     D->getType().print(Out, Policy);
1642     Out << " : ";
1643     D->getCombiner()->printPretty(Out, nullptr, Policy, 0);
1644     Out << ")";
1645     if (auto *Init = D->getInitializer()) {
1646       Out << " initializer(";
1647       switch (D->getInitializerKind()) {
1648       case OMPDeclareReductionDecl::DirectInit:
1649         Out << "omp_priv(";
1650         break;
1651       case OMPDeclareReductionDecl::CopyInit:
1652         Out << "omp_priv = ";
1653         break;
1654       case OMPDeclareReductionDecl::CallInit:
1655         break;
1656       }
1657       Init->printPretty(Out, nullptr, Policy, 0);
1658       if (D->getInitializerKind() == OMPDeclareReductionDecl::DirectInit)
1659         Out << ")";
1660       Out << ")";
1661     }
1662   }
1663 }
1664 
1665 void DeclPrinter::VisitOMPDeclareMapperDecl(OMPDeclareMapperDecl *D) {
1666   if (!D->isInvalidDecl()) {
1667     Out << "#pragma omp declare mapper (";
1668     D->printName(Out);
1669     Out << " : ";
1670     D->getType().print(Out, Policy);
1671     Out << " ";
1672     Out << D->getVarName();
1673     Out << ")";
1674     if (!D->clauselist_empty()) {
1675       OMPClausePrinter Printer(Out, Policy);
1676       for (auto *C : D->clauselists()) {
1677         Out << " ";
1678         Printer.Visit(C);
1679       }
1680     }
1681   }
1682 }
1683 
1684 void DeclPrinter::VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D) {
1685   D->getInit()->printPretty(Out, nullptr, Policy, Indentation);
1686 }
1687 
1688 void DeclPrinter::VisitTemplateTypeParmDecl(const TemplateTypeParmDecl *TTP) {
1689   if (const TypeConstraint *TC = TTP->getTypeConstraint())
1690     TC->print(Out, Policy);
1691   else if (TTP->wasDeclaredWithTypename())
1692     Out << "typename";
1693   else
1694     Out << "class";
1695 
1696   if (TTP->isParameterPack())
1697     Out << " ...";
1698   else if (!TTP->getName().empty())
1699     Out << ' ';
1700 
1701   Out << *TTP;
1702 
1703   if (TTP->hasDefaultArgument()) {
1704     Out << " = ";
1705     Out << TTP->getDefaultArgument().getAsString(Policy);
1706   }
1707 }
1708 
1709 void DeclPrinter::VisitNonTypeTemplateParmDecl(
1710     const NonTypeTemplateParmDecl *NTTP) {
1711   StringRef Name;
1712   if (IdentifierInfo *II = NTTP->getIdentifier())
1713     Name = II->getName();
1714   printDeclType(NTTP->getType(), Name, NTTP->isParameterPack());
1715 
1716   if (NTTP->hasDefaultArgument()) {
1717     Out << " = ";
1718     NTTP->getDefaultArgument()->printPretty(Out, nullptr, Policy, Indentation);
1719   }
1720 }
1721