1 //===--- DeclPrinter.cpp - Printing implementation for Decl ASTs ----------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the Decl::dump method, which pretty print the
11 // AST back out to C/Objective-C/C++/Objective-C++ code.
12 //
13 //===----------------------------------------------------------------------===//
14 #include "clang/AST/ASTContext.h"
15 #include "clang/AST/Attr.h"
16 #include "clang/AST/Decl.h"
17 #include "clang/AST/DeclCXX.h"
18 #include "clang/AST/DeclObjC.h"
19 #include "clang/AST/DeclVisitor.h"
20 #include "clang/AST/Expr.h"
21 #include "clang/AST/ExprCXX.h"
22 #include "clang/AST/PrettyPrinter.h"
23 #include "clang/Basic/Module.h"
24 #include "llvm/Support/raw_ostream.h"
25 using namespace clang;
26 
27 namespace {
28   class DeclPrinter : public DeclVisitor<DeclPrinter> {
29     raw_ostream &Out;
30     PrintingPolicy Policy;
31     unsigned Indentation;
32     bool PrintInstantiation;
33 
34     raw_ostream& Indent() { return Indent(Indentation); }
35     raw_ostream& Indent(unsigned Indentation);
36     void ProcessDeclGroup(SmallVectorImpl<Decl*>& Decls);
37 
38     void Print(AccessSpecifier AS);
39 
40   public:
41     DeclPrinter(raw_ostream &Out, const PrintingPolicy &Policy,
42                 unsigned Indentation = 0, bool PrintInstantiation = false)
43       : Out(Out), Policy(Policy), Indentation(Indentation),
44         PrintInstantiation(PrintInstantiation) { }
45 
46     void VisitDeclContext(DeclContext *DC, bool Indent = true);
47 
48     void VisitTranslationUnitDecl(TranslationUnitDecl *D);
49     void VisitTypedefDecl(TypedefDecl *D);
50     void VisitTypeAliasDecl(TypeAliasDecl *D);
51     void VisitEnumDecl(EnumDecl *D);
52     void VisitRecordDecl(RecordDecl *D);
53     void VisitEnumConstantDecl(EnumConstantDecl *D);
54     void VisitFunctionDecl(FunctionDecl *D);
55     void VisitFriendDecl(FriendDecl *D);
56     void VisitFieldDecl(FieldDecl *D);
57     void VisitVarDecl(VarDecl *D);
58     void VisitLabelDecl(LabelDecl *D);
59     void VisitParmVarDecl(ParmVarDecl *D);
60     void VisitFileScopeAsmDecl(FileScopeAsmDecl *D);
61     void VisitImportDecl(ImportDecl *D);
62     void VisitStaticAssertDecl(StaticAssertDecl *D);
63     void VisitNamespaceDecl(NamespaceDecl *D);
64     void VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
65     void VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
66     void VisitCXXRecordDecl(CXXRecordDecl *D);
67     void VisitLinkageSpecDecl(LinkageSpecDecl *D);
68     void VisitTemplateDecl(const TemplateDecl *D);
69     void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
70     void VisitClassTemplateDecl(ClassTemplateDecl *D);
71     void VisitObjCMethodDecl(ObjCMethodDecl *D);
72     void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
73     void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
74     void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
75     void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
76     void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
77     void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
78     void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
79     void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
80     void VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
81     void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
82     void VisitUsingDecl(UsingDecl *D);
83     void VisitUsingShadowDecl(UsingShadowDecl *D);
84 
85     void PrintTemplateParameters(const TemplateParameterList *Params,
86                                  const TemplateArgumentList *Args);
87     void prettyPrintAttributes(Decl *D);
88   };
89 }
90 
91 void Decl::print(raw_ostream &Out, unsigned Indentation,
92                  bool PrintInstantiation) const {
93   print(Out, getASTContext().getPrintingPolicy(), Indentation, PrintInstantiation);
94 }
95 
96 void Decl::print(raw_ostream &Out, const PrintingPolicy &Policy,
97                  unsigned Indentation, bool PrintInstantiation) const {
98   DeclPrinter Printer(Out, Policy, Indentation, PrintInstantiation);
99   Printer.Visit(const_cast<Decl*>(this));
100 }
101 
102 static QualType GetBaseType(QualType T) {
103   // FIXME: This should be on the Type class!
104   QualType BaseType = T;
105   while (!BaseType->isSpecifierType()) {
106     if (isa<TypedefType>(BaseType))
107       break;
108     else if (const PointerType* PTy = BaseType->getAs<PointerType>())
109       BaseType = PTy->getPointeeType();
110     else if (const BlockPointerType *BPy = BaseType->getAs<BlockPointerType>())
111       BaseType = BPy->getPointeeType();
112     else if (const ArrayType* ATy = dyn_cast<ArrayType>(BaseType))
113       BaseType = ATy->getElementType();
114     else if (const FunctionType* FTy = BaseType->getAs<FunctionType>())
115       BaseType = FTy->getResultType();
116     else if (const VectorType *VTy = BaseType->getAs<VectorType>())
117       BaseType = VTy->getElementType();
118     else if (const ReferenceType *RTy = BaseType->getAs<ReferenceType>())
119       BaseType = RTy->getPointeeType();
120     else
121       llvm_unreachable("Unknown declarator!");
122   }
123   return BaseType;
124 }
125 
126 static QualType getDeclType(Decl* D) {
127   if (TypedefNameDecl* TDD = dyn_cast<TypedefNameDecl>(D))
128     return TDD->getUnderlyingType();
129   if (ValueDecl* VD = dyn_cast<ValueDecl>(D))
130     return VD->getType();
131   return QualType();
132 }
133 
134 void Decl::printGroup(Decl** Begin, unsigned NumDecls,
135                       raw_ostream &Out, const PrintingPolicy &Policy,
136                       unsigned Indentation) {
137   if (NumDecls == 1) {
138     (*Begin)->print(Out, Policy, Indentation);
139     return;
140   }
141 
142   Decl** End = Begin + NumDecls;
143   TagDecl* TD = dyn_cast<TagDecl>(*Begin);
144   if (TD)
145     ++Begin;
146 
147   PrintingPolicy SubPolicy(Policy);
148   if (TD && TD->isCompleteDefinition()) {
149     TD->print(Out, Policy, Indentation);
150     Out << " ";
151     SubPolicy.SuppressTag = true;
152   }
153 
154   bool isFirst = true;
155   for ( ; Begin != End; ++Begin) {
156     if (isFirst) {
157       SubPolicy.SuppressSpecifiers = false;
158       isFirst = false;
159     } else {
160       if (!isFirst) Out << ", ";
161       SubPolicy.SuppressSpecifiers = true;
162     }
163 
164     (*Begin)->print(Out, SubPolicy, Indentation);
165   }
166 }
167 
168 void DeclContext::dumpDeclContext() const {
169   // Get the translation unit
170   const DeclContext *DC = this;
171   while (!DC->isTranslationUnit())
172     DC = DC->getParent();
173 
174   ASTContext &Ctx = cast<TranslationUnitDecl>(DC)->getASTContext();
175   DeclPrinter Printer(llvm::errs(), Ctx.getPrintingPolicy(), 0);
176   Printer.VisitDeclContext(const_cast<DeclContext *>(this), /*Indent=*/false);
177 }
178 
179 void Decl::dump() const {
180   dump(llvm::errs());
181 }
182 
183 void Decl::dump(raw_ostream &Out) const {
184   PrintingPolicy Policy = getASTContext().getPrintingPolicy();
185   Policy.DumpSourceManager = &getASTContext().getSourceManager();
186   print(Out, Policy, /*Indentation*/ 0, /*PrintInstantiation*/ true);
187 }
188 
189 raw_ostream& DeclPrinter::Indent(unsigned Indentation) {
190   for (unsigned i = 0; i != Indentation; ++i)
191     Out << "  ";
192   return Out;
193 }
194 
195 void DeclPrinter::prettyPrintAttributes(Decl *D) {
196   if (Policy.SuppressAttributes)
197     return;
198 
199   if (D->hasAttrs()) {
200     AttrVec &Attrs = D->getAttrs();
201     for (AttrVec::const_iterator i=Attrs.begin(), e=Attrs.end(); i!=e; ++i) {
202       Attr *A = *i;
203       A->printPretty(Out, Policy);
204     }
205   }
206 }
207 
208 void DeclPrinter::ProcessDeclGroup(SmallVectorImpl<Decl*>& Decls) {
209   this->Indent();
210   Decl::printGroup(Decls.data(), Decls.size(), Out, Policy, Indentation);
211   Out << ";\n";
212   Decls.clear();
213 
214 }
215 
216 void DeclPrinter::Print(AccessSpecifier AS) {
217   switch(AS) {
218   case AS_none:      llvm_unreachable("No access specifier!");
219   case AS_public:    Out << "public"; break;
220   case AS_protected: Out << "protected"; break;
221   case AS_private:   Out << "private"; break;
222   }
223 }
224 
225 //----------------------------------------------------------------------------
226 // Common C declarations
227 //----------------------------------------------------------------------------
228 
229 void DeclPrinter::VisitDeclContext(DeclContext *DC, bool Indent) {
230   if (Policy.TerseOutput)
231     return;
232 
233   if (Indent)
234     Indentation += Policy.Indentation;
235 
236   SmallVector<Decl*, 2> Decls;
237   for (DeclContext::decl_iterator D = DC->decls_begin(), DEnd = DC->decls_end();
238        D != DEnd; ++D) {
239 
240     // Don't print ObjCIvarDecls, as they are printed when visiting the
241     // containing ObjCInterfaceDecl.
242     if (isa<ObjCIvarDecl>(*D))
243       continue;
244 
245     if (!Policy.DumpSourceManager) {
246       // Skip over implicit declarations in pretty-printing mode.
247       if (D->isImplicit()) continue;
248       // FIXME: Ugly hack so we don't pretty-print the builtin declaration
249       // of __builtin_va_list or __[u]int128_t.  There should be some other way
250       // to check that.
251       if (NamedDecl *ND = dyn_cast<NamedDecl>(*D)) {
252         if (IdentifierInfo *II = ND->getIdentifier()) {
253           if (II->isStr("__builtin_va_list") ||
254               II->isStr("__int128_t") || II->isStr("__uint128_t"))
255             continue;
256         }
257       }
258     }
259 
260     // The next bits of code handles stuff like "struct {int x;} a,b"; we're
261     // forced to merge the declarations because there's no other way to
262     // refer to the struct in question.  This limited merging is safe without
263     // a bunch of other checks because it only merges declarations directly
264     // referring to the tag, not typedefs.
265     //
266     // Check whether the current declaration should be grouped with a previous
267     // unnamed struct.
268     QualType CurDeclType = getDeclType(*D);
269     if (!Decls.empty() && !CurDeclType.isNull()) {
270       QualType BaseType = GetBaseType(CurDeclType);
271       if (!BaseType.isNull() && isa<TagType>(BaseType) &&
272           cast<TagType>(BaseType)->getDecl() == Decls[0]) {
273         Decls.push_back(*D);
274         continue;
275       }
276     }
277 
278     // If we have a merged group waiting to be handled, handle it now.
279     if (!Decls.empty())
280       ProcessDeclGroup(Decls);
281 
282     // If the current declaration is an unnamed tag type, save it
283     // so we can merge it with the subsequent declaration(s) using it.
284     if (isa<TagDecl>(*D) && !cast<TagDecl>(*D)->getIdentifier()) {
285       Decls.push_back(*D);
286       continue;
287     }
288 
289     if (isa<AccessSpecDecl>(*D)) {
290       Indentation -= Policy.Indentation;
291       this->Indent();
292       Print(D->getAccess());
293       Out << ":\n";
294       Indentation += Policy.Indentation;
295       continue;
296     }
297 
298     this->Indent();
299     Visit(*D);
300 
301     // FIXME: Need to be able to tell the DeclPrinter when
302     const char *Terminator = 0;
303     if (isa<FunctionDecl>(*D) &&
304         cast<FunctionDecl>(*D)->isThisDeclarationADefinition())
305       Terminator = 0;
306     else if (isa<ObjCMethodDecl>(*D) && cast<ObjCMethodDecl>(*D)->getBody())
307       Terminator = 0;
308     else if (isa<NamespaceDecl>(*D) || isa<LinkageSpecDecl>(*D) ||
309              isa<ObjCImplementationDecl>(*D) ||
310              isa<ObjCInterfaceDecl>(*D) ||
311              isa<ObjCProtocolDecl>(*D) ||
312              isa<ObjCCategoryImplDecl>(*D) ||
313              isa<ObjCCategoryDecl>(*D))
314       Terminator = 0;
315     else if (isa<EnumConstantDecl>(*D)) {
316       DeclContext::decl_iterator Next = D;
317       ++Next;
318       if (Next != DEnd)
319         Terminator = ",";
320     } else
321       Terminator = ";";
322 
323     if (Terminator)
324       Out << Terminator;
325     Out << "\n";
326   }
327 
328   if (!Decls.empty())
329     ProcessDeclGroup(Decls);
330 
331   if (Indent)
332     Indentation -= Policy.Indentation;
333 }
334 
335 void DeclPrinter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
336   VisitDeclContext(D, false);
337 }
338 
339 void DeclPrinter::VisitTypedefDecl(TypedefDecl *D) {
340   if (!Policy.SuppressSpecifiers) {
341     Out << "typedef ";
342 
343     if (D->isModulePrivate())
344       Out << "__module_private__ ";
345   }
346   D->getUnderlyingType().print(Out, Policy, D->getName());
347   prettyPrintAttributes(D);
348 }
349 
350 void DeclPrinter::VisitTypeAliasDecl(TypeAliasDecl *D) {
351   Out << "using " << *D << " = " << D->getUnderlyingType().getAsString(Policy);
352 }
353 
354 void DeclPrinter::VisitEnumDecl(EnumDecl *D) {
355   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
356     Out << "__module_private__ ";
357   Out << "enum ";
358   if (D->isScoped()) {
359     if (D->isScopedUsingClassTag())
360       Out << "class ";
361     else
362       Out << "struct ";
363   }
364   Out << *D;
365 
366   if (D->isFixed())
367     Out << " : " << D->getIntegerType().stream(Policy);
368 
369   if (D->isCompleteDefinition()) {
370     Out << " {\n";
371     VisitDeclContext(D);
372     Indent() << "}";
373   }
374   prettyPrintAttributes(D);
375 }
376 
377 void DeclPrinter::VisitRecordDecl(RecordDecl *D) {
378   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
379     Out << "__module_private__ ";
380   Out << D->getKindName();
381   if (D->getIdentifier())
382     Out << ' ' << *D;
383 
384   if (D->isCompleteDefinition()) {
385     Out << " {\n";
386     VisitDeclContext(D);
387     Indent() << "}";
388   }
389 }
390 
391 void DeclPrinter::VisitEnumConstantDecl(EnumConstantDecl *D) {
392   Out << *D;
393   if (Expr *Init = D->getInitExpr()) {
394     Out << " = ";
395     Init->printPretty(Out, 0, Policy, Indentation);
396   }
397 }
398 
399 void DeclPrinter::VisitFunctionDecl(FunctionDecl *D) {
400   CXXConstructorDecl *CDecl = dyn_cast<CXXConstructorDecl>(D);
401   if (!Policy.SuppressSpecifiers) {
402     switch (D->getStorageClassAsWritten()) {
403     case SC_None: break;
404     case SC_Extern: Out << "extern "; break;
405     case SC_Static: Out << "static "; break;
406     case SC_PrivateExtern: Out << "__private_extern__ "; break;
407     case SC_Auto: case SC_Register: case SC_OpenCLWorkGroupLocal:
408       llvm_unreachable("invalid for functions");
409     }
410 
411     if (D->isInlineSpecified())  Out << "inline ";
412     if (D->isVirtualAsWritten()) Out << "virtual ";
413     if (D->isModulePrivate())    Out << "__module_private__ ";
414     if (CDecl && CDecl->isExplicitSpecified())
415       Out << "explicit ";
416   }
417 
418   PrintingPolicy SubPolicy(Policy);
419   SubPolicy.SuppressSpecifiers = false;
420   std::string Proto = D->getNameInfo().getAsString();
421 
422   QualType Ty = D->getType();
423   while (const ParenType *PT = dyn_cast<ParenType>(Ty)) {
424     Proto = '(' + Proto + ')';
425     Ty = PT->getInnerType();
426   }
427 
428   if (isa<FunctionType>(Ty)) {
429     const FunctionType *AFT = Ty->getAs<FunctionType>();
430     const FunctionProtoType *FT = 0;
431     if (D->hasWrittenPrototype())
432       FT = dyn_cast<FunctionProtoType>(AFT);
433 
434     Proto += "(";
435     if (FT) {
436       llvm::raw_string_ostream POut(Proto);
437       DeclPrinter ParamPrinter(POut, SubPolicy, Indentation);
438       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
439         if (i) POut << ", ";
440         ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
441       }
442 
443       if (FT->isVariadic()) {
444         if (D->getNumParams()) POut << ", ";
445         POut << "...";
446       }
447     } else if (D->doesThisDeclarationHaveABody() && !D->hasPrototype()) {
448       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
449         if (i)
450           Proto += ", ";
451         Proto += D->getParamDecl(i)->getNameAsString();
452       }
453     }
454 
455     Proto += ")";
456 
457     if (FT) {
458       if (FT->isConst())
459         Proto += " const";
460       if (FT->isVolatile())
461         Proto += " volatile";
462       if (FT->isRestrict())
463         Proto += " restrict";
464     }
465 
466     if (FT && FT->hasDynamicExceptionSpec()) {
467       Proto += " throw(";
468       if (FT->getExceptionSpecType() == EST_MSAny)
469         Proto += "...";
470       else
471         for (unsigned I = 0, N = FT->getNumExceptions(); I != N; ++I) {
472           if (I)
473             Proto += ", ";
474 
475           Proto += FT->getExceptionType(I).getAsString(SubPolicy);
476         }
477       Proto += ")";
478     } else if (FT && isNoexceptExceptionSpec(FT->getExceptionSpecType())) {
479       Proto += " noexcept";
480       if (FT->getExceptionSpecType() == EST_ComputedNoexcept) {
481         Proto += "(";
482         llvm::raw_string_ostream EOut(Proto);
483         FT->getNoexceptExpr()->printPretty(EOut, 0, SubPolicy,
484                                            Indentation);
485         EOut.flush();
486         Proto += EOut.str();
487         Proto += ")";
488       }
489     }
490 
491     if (CDecl) {
492       bool HasInitializerList = false;
493       for (CXXConstructorDecl::init_const_iterator B = CDecl->init_begin(),
494            E = CDecl->init_end();
495            B != E; ++B) {
496         CXXCtorInitializer * BMInitializer = (*B);
497         if (BMInitializer->isInClassMemberInitializer())
498           continue;
499 
500         if (!HasInitializerList) {
501           Proto += " : ";
502           Out << Proto;
503           Proto.clear();
504           HasInitializerList = true;
505         } else
506           Out << ", ";
507 
508         if (BMInitializer->isAnyMemberInitializer()) {
509           FieldDecl *FD = BMInitializer->getAnyMember();
510           Out << *FD;
511         } else {
512           Out << QualType(BMInitializer->getBaseClass(), 0).getAsString(Policy);
513         }
514 
515         Out << "(";
516         if (!BMInitializer->getInit()) {
517           // Nothing to print
518         } else {
519           Expr *Init = BMInitializer->getInit();
520           if (ExprWithCleanups *Tmp = dyn_cast<ExprWithCleanups>(Init))
521             Init = Tmp->getSubExpr();
522 
523           Init = Init->IgnoreParens();
524 
525           Expr *SimpleInit = 0;
526           Expr **Args = 0;
527           unsigned NumArgs = 0;
528           if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
529             Args = ParenList->getExprs();
530             NumArgs = ParenList->getNumExprs();
531           } else if (CXXConstructExpr *Construct
532                                         = dyn_cast<CXXConstructExpr>(Init)) {
533             Args = Construct->getArgs();
534             NumArgs = Construct->getNumArgs();
535           } else
536             SimpleInit = Init;
537 
538           if (SimpleInit)
539             SimpleInit->printPretty(Out, 0, Policy, Indentation);
540           else {
541             for (unsigned I = 0; I != NumArgs; ++I) {
542               if (isa<CXXDefaultArgExpr>(Args[I]))
543                 break;
544 
545               if (I)
546                 Out << ", ";
547               Args[I]->printPretty(Out, 0, Policy, Indentation);
548             }
549           }
550         }
551         Out << ")";
552       }
553       if (!Proto.empty())
554         Out << Proto;
555     }
556     else
557       AFT->getResultType().print(Out, Policy, Proto);
558   } else {
559     Ty.print(Out, Policy, Proto);
560   }
561 
562   prettyPrintAttributes(D);
563 
564   if (D->isPure())
565     Out << " = 0";
566   else if (D->isDeletedAsWritten())
567     Out << " = delete";
568   else if (D->isExplicitlyDefaulted())
569     Out << " = default";
570   else if (D->doesThisDeclarationHaveABody() && !Policy.TerseOutput) {
571     if (!D->hasPrototype() && D->getNumParams()) {
572       // This is a K&R function definition, so we need to print the
573       // parameters.
574       Out << '\n';
575       DeclPrinter ParamPrinter(Out, SubPolicy, Indentation);
576       Indentation += Policy.Indentation;
577       for (unsigned i = 0, e = D->getNumParams(); i != e; ++i) {
578         Indent();
579         ParamPrinter.VisitParmVarDecl(D->getParamDecl(i));
580         Out << ";\n";
581       }
582       Indentation -= Policy.Indentation;
583     } else
584       Out << ' ';
585 
586     D->getBody()->printPretty(Out, 0, SubPolicy, Indentation);
587     Out << '\n';
588   }
589 }
590 
591 void DeclPrinter::VisitFriendDecl(FriendDecl *D) {
592   if (TypeSourceInfo *TSI = D->getFriendType()) {
593     if (CXXRecordDecl *FriendD = TSI->getType()->getAsCXXRecordDecl()) {
594       Out << "friend ";
595       VisitCXXRecordDecl(FriendD);
596     }
597   }
598   else if (FunctionDecl *FD =
599       dyn_cast<FunctionDecl>(D->getFriendDecl())) {
600     Out << "friend ";
601     VisitFunctionDecl(FD);
602   }
603   else if (FunctionTemplateDecl *FTD =
604            dyn_cast<FunctionTemplateDecl>(D->getFriendDecl())) {
605     Out << "friend ";
606     VisitFunctionTemplateDecl(FTD);
607   }
608   else if (ClassTemplateDecl *CTD =
609            dyn_cast<ClassTemplateDecl>(D->getFriendDecl())) {
610     Out << "friend ";
611     VisitClassTemplateDecl(CTD);
612   }
613 }
614 
615 void DeclPrinter::VisitFieldDecl(FieldDecl *D) {
616   if (!Policy.SuppressSpecifiers && D->isMutable())
617     Out << "mutable ";
618   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
619     Out << "__module_private__ ";
620 
621   Out << D->getType().stream(Policy, D->getName());
622 
623   if (D->isBitField()) {
624     Out << " : ";
625     D->getBitWidth()->printPretty(Out, 0, Policy, Indentation);
626   }
627 
628   Expr *Init = D->getInClassInitializer();
629   if (!Policy.SuppressInitializers && Init) {
630     if (D->getInClassInitStyle() == ICIS_ListInit)
631       Out << " ";
632     else
633       Out << " = ";
634     Init->printPretty(Out, 0, Policy, Indentation);
635   }
636   prettyPrintAttributes(D);
637 }
638 
639 void DeclPrinter::VisitLabelDecl(LabelDecl *D) {
640   Out << *D << ":";
641 }
642 
643 
644 void DeclPrinter::VisitVarDecl(VarDecl *D) {
645   StorageClass SCAsWritten = D->getStorageClassAsWritten();
646   if (!Policy.SuppressSpecifiers && SCAsWritten != SC_None)
647     Out << VarDecl::getStorageClassSpecifierString(SCAsWritten) << " ";
648 
649   if (!Policy.SuppressSpecifiers && D->isThreadSpecified())
650     Out << "__thread ";
651   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
652     Out << "__module_private__ ";
653 
654   QualType T = D->getType();
655   if (ParmVarDecl *Parm = dyn_cast<ParmVarDecl>(D))
656     T = Parm->getOriginalType();
657   T.print(Out, Policy, D->getName());
658   Expr *Init = D->getInit();
659   if (!Policy.SuppressInitializers && Init) {
660     bool ImplicitInit = false;
661     if (CXXConstructExpr *Construct = dyn_cast<CXXConstructExpr>(Init))
662       ImplicitInit = D->getInitStyle() == VarDecl::CallInit &&
663           Construct->getNumArgs() == 0 && !Construct->isListInitialization();
664     if (!ImplicitInit) {
665       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
666         Out << "(";
667       else if (D->getInitStyle() == VarDecl::CInit) {
668         Out << " = ";
669       }
670       Init->printPretty(Out, 0, Policy, Indentation);
671       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
672         Out << ")";
673     }
674   }
675   prettyPrintAttributes(D);
676 }
677 
678 void DeclPrinter::VisitParmVarDecl(ParmVarDecl *D) {
679   VisitVarDecl(D);
680 }
681 
682 void DeclPrinter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
683   Out << "__asm (";
684   D->getAsmString()->printPretty(Out, 0, Policy, Indentation);
685   Out << ")";
686 }
687 
688 void DeclPrinter::VisitImportDecl(ImportDecl *D) {
689   Out << "@__experimental_modules_import " << D->getImportedModule()->getFullModuleName()
690       << ";\n";
691 }
692 
693 void DeclPrinter::VisitStaticAssertDecl(StaticAssertDecl *D) {
694   Out << "static_assert(";
695   D->getAssertExpr()->printPretty(Out, 0, Policy, Indentation);
696   Out << ", ";
697   D->getMessage()->printPretty(Out, 0, Policy, Indentation);
698   Out << ")";
699 }
700 
701 //----------------------------------------------------------------------------
702 // C++ declarations
703 //----------------------------------------------------------------------------
704 void DeclPrinter::VisitNamespaceDecl(NamespaceDecl *D) {
705   if (D->isInline())
706     Out << "inline ";
707   Out << "namespace " << *D << " {\n";
708   VisitDeclContext(D);
709   Indent() << "}";
710 }
711 
712 void DeclPrinter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
713   Out << "using namespace ";
714   if (D->getQualifier())
715     D->getQualifier()->print(Out, Policy);
716   Out << *D->getNominatedNamespaceAsWritten();
717 }
718 
719 void DeclPrinter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
720   Out << "namespace " << *D << " = ";
721   if (D->getQualifier())
722     D->getQualifier()->print(Out, Policy);
723   Out << *D->getAliasedNamespace();
724 }
725 
726 void DeclPrinter::VisitCXXRecordDecl(CXXRecordDecl *D) {
727   if (!Policy.SuppressSpecifiers && D->isModulePrivate())
728     Out << "__module_private__ ";
729   Out << D->getKindName();
730   if (D->getIdentifier())
731     Out << ' ' << *D;
732 
733   if (D->isCompleteDefinition()) {
734     // Print the base classes
735     if (D->getNumBases()) {
736       Out << " : ";
737       for (CXXRecordDecl::base_class_iterator Base = D->bases_begin(),
738              BaseEnd = D->bases_end(); Base != BaseEnd; ++Base) {
739         if (Base != D->bases_begin())
740           Out << ", ";
741 
742         if (Base->isVirtual())
743           Out << "virtual ";
744 
745         AccessSpecifier AS = Base->getAccessSpecifierAsWritten();
746         if (AS != AS_none)
747           Print(AS);
748         Out << " " << Base->getType().getAsString(Policy);
749 
750         if (Base->isPackExpansion())
751           Out << "...";
752       }
753     }
754 
755     // Print the class definition
756     // FIXME: Doesn't print access specifiers, e.g., "public:"
757     Out << " {\n";
758     VisitDeclContext(D);
759     Indent() << "}";
760   }
761 }
762 
763 void DeclPrinter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
764   const char *l;
765   if (D->getLanguage() == LinkageSpecDecl::lang_c)
766     l = "C";
767   else {
768     assert(D->getLanguage() == LinkageSpecDecl::lang_cxx &&
769            "unknown language in linkage specification");
770     l = "C++";
771   }
772 
773   Out << "extern \"" << l << "\" ";
774   if (D->hasBraces()) {
775     Out << "{\n";
776     VisitDeclContext(D);
777     Indent() << "}";
778   } else
779     Visit(*D->decls_begin());
780 }
781 
782 void DeclPrinter::PrintTemplateParameters(
783     const TemplateParameterList *Params, const TemplateArgumentList *Args = 0) {
784   assert(Params);
785   assert(!Args || Params->size() == Args->size());
786 
787   Out << "template <";
788 
789   for (unsigned i = 0, e = Params->size(); i != e; ++i) {
790     if (i != 0)
791       Out << ", ";
792 
793     const Decl *Param = Params->getParam(i);
794     if (const TemplateTypeParmDecl *TTP =
795           dyn_cast<TemplateTypeParmDecl>(Param)) {
796 
797       if (TTP->wasDeclaredWithTypename())
798         Out << "typename ";
799       else
800         Out << "class ";
801 
802       if (TTP->isParameterPack())
803         Out << "... ";
804 
805       Out << *TTP;
806 
807       if (Args) {
808         Out << " = ";
809         Args->get(i).print(Policy, Out);
810       } else if (TTP->hasDefaultArgument()) {
811         Out << " = ";
812         Out << TTP->getDefaultArgument().getAsString(Policy);
813       };
814     } else if (const NonTypeTemplateParmDecl *NTTP =
815                  dyn_cast<NonTypeTemplateParmDecl>(Param)) {
816       Out << NTTP->getType().getAsString(Policy);
817 
818       if (NTTP->isParameterPack() && !isa<PackExpansionType>(NTTP->getType()))
819         Out << "...";
820 
821       if (IdentifierInfo *Name = NTTP->getIdentifier()) {
822         Out << ' ';
823         Out << Name->getName();
824       }
825 
826       if (Args) {
827         Out << " = ";
828         Args->get(i).print(Policy, Out);
829       } else if (NTTP->hasDefaultArgument()) {
830         Out << " = ";
831         NTTP->getDefaultArgument()->printPretty(Out, 0, Policy, Indentation);
832       }
833     } else if (const TemplateTemplateParmDecl *TTPD =
834                  dyn_cast<TemplateTemplateParmDecl>(Param)) {
835       VisitTemplateDecl(TTPD);
836       // FIXME: print the default argument, if present.
837     }
838   }
839 
840   Out << "> ";
841 }
842 
843 void DeclPrinter::VisitTemplateDecl(const TemplateDecl *D) {
844   PrintTemplateParameters(D->getTemplateParameters());
845 
846   if (const TemplateTemplateParmDecl *TTP =
847         dyn_cast<TemplateTemplateParmDecl>(D)) {
848     Out << "class ";
849     if (TTP->isParameterPack())
850       Out << "...";
851     Out << D->getName();
852   } else {
853     Visit(D->getTemplatedDecl());
854   }
855 }
856 
857 void DeclPrinter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
858   if (PrintInstantiation) {
859     TemplateParameterList *Params = D->getTemplateParameters();
860     for (FunctionTemplateDecl::spec_iterator I = D->spec_begin(), E = D->spec_end();
861          I != E; ++I) {
862       PrintTemplateParameters(Params, (*I)->getTemplateSpecializationArgs());
863       Visit(*I);
864     }
865   }
866 
867   return VisitRedeclarableTemplateDecl(D);
868 }
869 
870 void DeclPrinter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
871   if (PrintInstantiation) {
872     TemplateParameterList *Params = D->getTemplateParameters();
873     for (ClassTemplateDecl::spec_iterator I = D->spec_begin(), E = D->spec_end();
874          I != E; ++I) {
875       PrintTemplateParameters(Params, &(*I)->getTemplateArgs());
876       Visit(*I);
877       Out << '\n';
878     }
879   }
880 
881   return VisitRedeclarableTemplateDecl(D);
882 }
883 
884 //----------------------------------------------------------------------------
885 // Objective-C declarations
886 //----------------------------------------------------------------------------
887 
888 void DeclPrinter::VisitObjCMethodDecl(ObjCMethodDecl *OMD) {
889   if (OMD->isInstanceMethod())
890     Out << "- ";
891   else
892     Out << "+ ";
893   if (!OMD->getResultType().isNull())
894     Out << '(' << OMD->getResultType().getAsString(Policy) << ")";
895 
896   std::string name = OMD->getSelector().getAsString();
897   std::string::size_type pos, lastPos = 0;
898   for (ObjCMethodDecl::param_iterator PI = OMD->param_begin(),
899        E = OMD->param_end(); PI != E; ++PI) {
900     // FIXME: selector is missing here!
901     pos = name.find_first_of(':', lastPos);
902     Out << " " << name.substr(lastPos, pos - lastPos);
903     Out << ":(" << (*PI)->getType().getAsString(Policy) << ')' << **PI;
904     lastPos = pos + 1;
905   }
906 
907   if (OMD->param_begin() == OMD->param_end())
908     Out << " " << name;
909 
910   if (OMD->isVariadic())
911       Out << ", ...";
912 
913   if (OMD->getBody() && !Policy.TerseOutput) {
914     Out << ' ';
915     OMD->getBody()->printPretty(Out, 0, Policy);
916     Out << '\n';
917   }
918 }
919 
920 void DeclPrinter::VisitObjCImplementationDecl(ObjCImplementationDecl *OID) {
921   std::string I = OID->getNameAsString();
922   ObjCInterfaceDecl *SID = OID->getSuperClass();
923 
924   if (SID)
925     Out << "@implementation " << I << " : " << *SID;
926   else
927     Out << "@implementation " << I;
928 
929   if (OID->ivar_size() > 0) {
930     Out << "{\n";
931     Indentation += Policy.Indentation;
932     for (ObjCImplementationDecl::ivar_iterator I = OID->ivar_begin(),
933          E = OID->ivar_end(); I != E; ++I) {
934       Indent() << I->getType().getAsString(Policy) << ' ' << **I << ";\n";
935     }
936     Indentation -= Policy.Indentation;
937     Out << "}\n";
938   }
939   VisitDeclContext(OID, false);
940   Out << "@end";
941 }
942 
943 void DeclPrinter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *OID) {
944   std::string I = OID->getNameAsString();
945   ObjCInterfaceDecl *SID = OID->getSuperClass();
946 
947   if (!OID->isThisDeclarationADefinition()) {
948     Out << "@class " << I << ";";
949     return;
950   }
951 
952   if (SID)
953     Out << "@interface " << I << " : " << *SID;
954   else
955     Out << "@interface " << I;
956 
957   // Protocols?
958   const ObjCList<ObjCProtocolDecl> &Protocols = OID->getReferencedProtocols();
959   if (!Protocols.empty()) {
960     for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
961          E = Protocols.end(); I != E; ++I)
962       Out << (I == Protocols.begin() ? '<' : ',') << **I;
963   }
964 
965   if (!Protocols.empty())
966     Out << "> ";
967 
968   if (OID->ivar_size() > 0) {
969     Out << "{\n";
970     Indentation += Policy.Indentation;
971     for (ObjCInterfaceDecl::ivar_iterator I = OID->ivar_begin(),
972          E = OID->ivar_end(); I != E; ++I) {
973       Indent() << I->getType().getAsString(Policy) << ' ' << **I << ";\n";
974     }
975     Indentation -= Policy.Indentation;
976     Out << "}\n";
977   }
978 
979   VisitDeclContext(OID, false);
980   Out << "@end";
981   // FIXME: implement the rest...
982 }
983 
984 void DeclPrinter::VisitObjCProtocolDecl(ObjCProtocolDecl *PID) {
985   if (!PID->isThisDeclarationADefinition()) {
986     Out << "@protocol " << PID->getIdentifier() << ";\n";
987     return;
988   }
989 
990   Out << "@protocol " << *PID << '\n';
991   VisitDeclContext(PID, false);
992   Out << "@end";
993 }
994 
995 void DeclPrinter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *PID) {
996   Out << "@implementation " << *PID->getClassInterface() << '(' << *PID <<")\n";
997 
998   VisitDeclContext(PID, false);
999   Out << "@end";
1000   // FIXME: implement the rest...
1001 }
1002 
1003 void DeclPrinter::VisitObjCCategoryDecl(ObjCCategoryDecl *PID) {
1004   Out << "@interface " << *PID->getClassInterface() << '(' << *PID << ")\n";
1005   if (PID->ivar_size() > 0) {
1006     Out << "{\n";
1007     Indentation += Policy.Indentation;
1008     for (ObjCCategoryDecl::ivar_iterator I = PID->ivar_begin(),
1009          E = PID->ivar_end(); I != E; ++I) {
1010       Indent() << I->getType().getAsString(Policy) << ' ' << **I << ";\n";
1011     }
1012     Indentation -= Policy.Indentation;
1013     Out << "}\n";
1014   }
1015 
1016   VisitDeclContext(PID, false);
1017   Out << "@end";
1018 
1019   // FIXME: implement the rest...
1020 }
1021 
1022 void DeclPrinter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *AID) {
1023   Out << "@compatibility_alias " << *AID
1024       << ' ' << *AID->getClassInterface() << ";\n";
1025 }
1026 
1027 /// PrintObjCPropertyDecl - print a property declaration.
1028 ///
1029 void DeclPrinter::VisitObjCPropertyDecl(ObjCPropertyDecl *PDecl) {
1030   if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Required)
1031     Out << "@required\n";
1032   else if (PDecl->getPropertyImplementation() == ObjCPropertyDecl::Optional)
1033     Out << "@optional\n";
1034 
1035   Out << "@property";
1036   if (PDecl->getPropertyAttributes() != ObjCPropertyDecl::OBJC_PR_noattr) {
1037     bool first = true;
1038     Out << " (";
1039     if (PDecl->getPropertyAttributes() &
1040         ObjCPropertyDecl::OBJC_PR_readonly) {
1041       Out << (first ? ' ' : ',') << "readonly";
1042       first = false;
1043     }
1044 
1045     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) {
1046       Out << (first ? ' ' : ',') << "getter = "
1047           << PDecl->getGetterName().getAsString();
1048       first = false;
1049     }
1050     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) {
1051       Out << (first ? ' ' : ',') << "setter = "
1052           << PDecl->getSetterName().getAsString();
1053       first = false;
1054     }
1055 
1056     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_assign) {
1057       Out << (first ? ' ' : ',') << "assign";
1058       first = false;
1059     }
1060 
1061     if (PDecl->getPropertyAttributes() &
1062         ObjCPropertyDecl::OBJC_PR_readwrite) {
1063       Out << (first ? ' ' : ',') << "readwrite";
1064       first = false;
1065     }
1066 
1067     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_retain) {
1068       Out << (first ? ' ' : ',') << "retain";
1069       first = false;
1070     }
1071 
1072     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_strong) {
1073       Out << (first ? ' ' : ',') << "strong";
1074       first = false;
1075     }
1076 
1077     if (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_copy) {
1078       Out << (first ? ' ' : ',') << "copy";
1079       first = false;
1080     }
1081 
1082     if (PDecl->getPropertyAttributes() &
1083         ObjCPropertyDecl::OBJC_PR_nonatomic) {
1084       Out << (first ? ' ' : ',') << "nonatomic";
1085       first = false;
1086     }
1087     if (PDecl->getPropertyAttributes() &
1088         ObjCPropertyDecl::OBJC_PR_atomic) {
1089       Out << (first ? ' ' : ',') << "atomic";
1090       first = false;
1091     }
1092 
1093     (void) first; // Silence dead store warning due to idiomatic code.
1094     Out << " )";
1095   }
1096   Out << ' ' << PDecl->getType().getAsString(Policy) << ' ' << *PDecl;
1097 }
1098 
1099 void DeclPrinter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *PID) {
1100   if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize)
1101     Out << "@synthesize ";
1102   else
1103     Out << "@dynamic ";
1104   Out << *PID->getPropertyDecl();
1105   if (PID->getPropertyIvarDecl())
1106     Out << '=' << *PID->getPropertyIvarDecl();
1107 }
1108 
1109 void DeclPrinter::VisitUsingDecl(UsingDecl *D) {
1110   Out << "using ";
1111   D->getQualifier()->print(Out, Policy);
1112   Out << *D;
1113 }
1114 
1115 void
1116 DeclPrinter::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) {
1117   Out << "using typename ";
1118   D->getQualifier()->print(Out, Policy);
1119   Out << D->getDeclName();
1120 }
1121 
1122 void DeclPrinter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1123   Out << "using ";
1124   D->getQualifier()->print(Out, Policy);
1125   Out << D->getName();
1126 }
1127 
1128 void DeclPrinter::VisitUsingShadowDecl(UsingShadowDecl *D) {
1129   // ignore
1130 }
1131