1 #include "clang/AST/JSONNodeDumper.h"
2 #include "clang/Basic/SourceManager.h"
3 #include "clang/Lex/Lexer.h"
4 #include "llvm/ADT/StringSwitch.h"
5 
6 using namespace clang;
7 
8 void JSONNodeDumper::addPreviousDeclaration(const Decl *D) {
9   switch (D->getKind()) {
10 #define DECL(DERIVED, BASE)                                                    \
11   case Decl::DERIVED:                                                          \
12     return writePreviousDeclImpl(cast<DERIVED##Decl>(D));
13 #define ABSTRACT_DECL(DECL)
14 #include "clang/AST/DeclNodes.inc"
15 #undef ABSTRACT_DECL
16 #undef DECL
17   }
18   llvm_unreachable("Decl that isn't part of DeclNodes.inc!");
19 }
20 
21 void JSONNodeDumper::Visit(const Attr *A) {
22   const char *AttrName = nullptr;
23   switch (A->getKind()) {
24 #define ATTR(X)                                                                \
25   case attr::X:                                                                \
26     AttrName = #X"Attr";                                                       \
27     break;
28 #include "clang/Basic/AttrList.inc"
29 #undef ATTR
30   }
31   JOS.attribute("id", createPointerRepresentation(A));
32   JOS.attribute("kind", AttrName);
33   JOS.attributeObject("range", [A, this] { writeSourceRange(A->getRange()); });
34   attributeOnlyIfTrue("inherited", A->isInherited());
35   attributeOnlyIfTrue("implicit", A->isImplicit());
36 
37   // FIXME: it would be useful for us to output the spelling kind as well as
38   // the actual spelling. This would allow us to distinguish between the
39   // various attribute syntaxes, but we don't currently track that information
40   // within the AST.
41   //JOS.attribute("spelling", A->getSpelling());
42 
43   InnerAttrVisitor::Visit(A);
44 }
45 
46 void JSONNodeDumper::Visit(const Stmt *S) {
47   if (!S)
48     return;
49 
50   JOS.attribute("id", createPointerRepresentation(S));
51   JOS.attribute("kind", S->getStmtClassName());
52   JOS.attributeObject("range",
53                       [S, this] { writeSourceRange(S->getSourceRange()); });
54 
55   if (const auto *E = dyn_cast<Expr>(S)) {
56     JOS.attribute("type", createQualType(E->getType()));
57     const char *Category = nullptr;
58     switch (E->getValueKind()) {
59     case VK_LValue: Category = "lvalue"; break;
60     case VK_XValue: Category = "xvalue"; break;
61     case VK_RValue: Category = "rvalue"; break;
62     }
63     JOS.attribute("valueCategory", Category);
64   }
65   InnerStmtVisitor::Visit(S);
66 }
67 
68 void JSONNodeDumper::Visit(const Type *T) {
69   JOS.attribute("id", createPointerRepresentation(T));
70 
71   if (!T)
72     return;
73 
74   JOS.attribute("kind", (llvm::Twine(T->getTypeClassName()) + "Type").str());
75   JOS.attribute("type", createQualType(QualType(T, 0), /*Desugar*/ false));
76   attributeOnlyIfTrue("isDependent", T->isDependentType());
77   attributeOnlyIfTrue("isInstantiationDependent",
78                       T->isInstantiationDependentType());
79   attributeOnlyIfTrue("isVariablyModified", T->isVariablyModifiedType());
80   attributeOnlyIfTrue("containsUnexpandedPack",
81                       T->containsUnexpandedParameterPack());
82   attributeOnlyIfTrue("isImported", T->isFromAST());
83   InnerTypeVisitor::Visit(T);
84 }
85 
86 void JSONNodeDumper::Visit(QualType T) {
87   JOS.attribute("id", createPointerRepresentation(T.getAsOpaquePtr()));
88   JOS.attribute("kind", "QualType");
89   JOS.attribute("type", createQualType(T));
90   JOS.attribute("qualifiers", T.split().Quals.getAsString());
91 }
92 
93 void JSONNodeDumper::Visit(const Decl *D) {
94   JOS.attribute("id", createPointerRepresentation(D));
95 
96   if (!D)
97     return;
98 
99   JOS.attribute("kind", (llvm::Twine(D->getDeclKindName()) + "Decl").str());
100   JOS.attributeObject("loc",
101                       [D, this] { writeSourceLocation(D->getLocation()); });
102   JOS.attributeObject("range",
103                       [D, this] { writeSourceRange(D->getSourceRange()); });
104   attributeOnlyIfTrue("isImplicit", D->isImplicit());
105   attributeOnlyIfTrue("isInvalid", D->isInvalidDecl());
106 
107   if (D->isUsed())
108     JOS.attribute("isUsed", true);
109   else if (D->isThisDeclarationReferenced())
110     JOS.attribute("isReferenced", true);
111 
112   if (const auto *ND = dyn_cast<NamedDecl>(D))
113     attributeOnlyIfTrue("isHidden", ND->isHidden());
114 
115   if (D->getLexicalDeclContext() != D->getDeclContext()) {
116     // Because of multiple inheritance, a DeclContext pointer does not produce
117     // the same pointer representation as a Decl pointer that references the
118     // same AST Node.
119     const auto *ParentDeclContextDecl = dyn_cast<Decl>(D->getDeclContext());
120     JOS.attribute("parentDeclContextId",
121                   createPointerRepresentation(ParentDeclContextDecl));
122   }
123 
124   addPreviousDeclaration(D);
125   InnerDeclVisitor::Visit(D);
126 }
127 
128 void JSONNodeDumper::Visit(const comments::Comment *C,
129                            const comments::FullComment *FC) {
130   if (!C)
131     return;
132 
133   JOS.attribute("id", createPointerRepresentation(C));
134   JOS.attribute("kind", C->getCommentKindName());
135   JOS.attributeObject("loc",
136                       [C, this] { writeSourceLocation(C->getLocation()); });
137   JOS.attributeObject("range",
138                       [C, this] { writeSourceRange(C->getSourceRange()); });
139 
140   InnerCommentVisitor::visit(C, FC);
141 }
142 
143 void JSONNodeDumper::Visit(const TemplateArgument &TA, SourceRange R,
144                            const Decl *From, StringRef Label) {
145   JOS.attribute("kind", "TemplateArgument");
146   if (R.isValid())
147     JOS.attributeObject("range", [R, this] { writeSourceRange(R); });
148 
149   if (From)
150     JOS.attribute(Label.empty() ? "fromDecl" : Label, createBareDeclRef(From));
151 
152   InnerTemplateArgVisitor::Visit(TA);
153 }
154 
155 void JSONNodeDumper::Visit(const CXXCtorInitializer *Init) {
156   JOS.attribute("kind", "CXXCtorInitializer");
157   if (Init->isAnyMemberInitializer())
158     JOS.attribute("anyInit", createBareDeclRef(Init->getAnyMember()));
159   else if (Init->isBaseInitializer())
160     JOS.attribute("baseInit",
161                   createQualType(QualType(Init->getBaseClass(), 0)));
162   else if (Init->isDelegatingInitializer())
163     JOS.attribute("delegatingInit",
164                   createQualType(Init->getTypeSourceInfo()->getType()));
165   else
166     llvm_unreachable("Unknown initializer type");
167 }
168 
169 void JSONNodeDumper::Visit(const OMPClause *C) {}
170 
171 void JSONNodeDumper::Visit(const BlockDecl::Capture &C) {
172   JOS.attribute("kind", "Capture");
173   attributeOnlyIfTrue("byref", C.isByRef());
174   attributeOnlyIfTrue("nested", C.isNested());
175   if (C.getVariable())
176     JOS.attribute("var", createBareDeclRef(C.getVariable()));
177 }
178 
179 void JSONNodeDumper::Visit(const GenericSelectionExpr::ConstAssociation &A) {
180   JOS.attribute("associationKind", A.getTypeSourceInfo() ? "case" : "default");
181   attributeOnlyIfTrue("selected", A.isSelected());
182 }
183 
184 void JSONNodeDumper::writeIncludeStack(PresumedLoc Loc, bool JustFirst) {
185   if (Loc.isInvalid())
186     return;
187 
188   JOS.attributeBegin("includedFrom");
189   JOS.objectBegin();
190 
191   if (!JustFirst) {
192     // Walk the stack recursively, then print out the presumed location.
193     writeIncludeStack(SM.getPresumedLoc(Loc.getIncludeLoc()));
194   }
195 
196   JOS.attribute("file", Loc.getFilename());
197   JOS.objectEnd();
198   JOS.attributeEnd();
199 }
200 
201 void JSONNodeDumper::writeBareSourceLocation(SourceLocation Loc,
202                                              bool IsSpelling) {
203   PresumedLoc Presumed = SM.getPresumedLoc(Loc);
204   unsigned ActualLine = IsSpelling ? SM.getSpellingLineNumber(Loc)
205                                    : SM.getExpansionLineNumber(Loc);
206   StringRef ActualFile = SM.getBufferName(Loc);
207 
208   if (Presumed.isValid()) {
209     JOS.attribute("offset", SM.getDecomposedLoc(Loc).second);
210     if (LastLocFilename != ActualFile) {
211       JOS.attribute("file", ActualFile);
212       JOS.attribute("line", ActualLine);
213     } else if (LastLocLine != ActualLine)
214       JOS.attribute("line", ActualLine);
215 
216     StringRef PresumedFile = Presumed.getFilename();
217     if (PresumedFile != ActualFile && LastLocPresumedFilename != PresumedFile)
218       JOS.attribute("presumedFile", PresumedFile);
219 
220     unsigned PresumedLine = Presumed.getLine();
221     if (ActualLine != PresumedLine && LastLocPresumedLine != PresumedLine)
222       JOS.attribute("presumedLine", PresumedLine);
223 
224     JOS.attribute("col", Presumed.getColumn());
225     JOS.attribute("tokLen",
226                   Lexer::MeasureTokenLength(Loc, SM, Ctx.getLangOpts()));
227     LastLocFilename = ActualFile;
228     LastLocPresumedFilename = PresumedFile;
229     LastLocPresumedLine = PresumedLine;
230     LastLocLine = ActualLine;
231 
232     // Orthogonal to the file, line, and column de-duplication is whether the
233     // given location was a result of an include. If so, print where the
234     // include location came from.
235     writeIncludeStack(SM.getPresumedLoc(Presumed.getIncludeLoc()),
236                       /*JustFirst*/ true);
237   }
238 }
239 
240 void JSONNodeDumper::writeSourceLocation(SourceLocation Loc) {
241   SourceLocation Spelling = SM.getSpellingLoc(Loc);
242   SourceLocation Expansion = SM.getExpansionLoc(Loc);
243 
244   if (Expansion != Spelling) {
245     // If the expansion and the spelling are different, output subobjects
246     // describing both locations.
247     JOS.attributeObject("spellingLoc", [Spelling, this] {
248       writeBareSourceLocation(Spelling, /*IsSpelling*/ true);
249     });
250     JOS.attributeObject("expansionLoc", [Expansion, Loc, this] {
251       writeBareSourceLocation(Expansion, /*IsSpelling*/ false);
252       // If there is a macro expansion, add extra information if the interesting
253       // bit is the macro arg expansion.
254       if (SM.isMacroArgExpansion(Loc))
255         JOS.attribute("isMacroArgExpansion", true);
256     });
257   } else
258     writeBareSourceLocation(Spelling, /*IsSpelling*/ true);
259 }
260 
261 void JSONNodeDumper::writeSourceRange(SourceRange R) {
262   JOS.attributeObject("begin",
263                       [R, this] { writeSourceLocation(R.getBegin()); });
264   JOS.attributeObject("end", [R, this] { writeSourceLocation(R.getEnd()); });
265 }
266 
267 std::string JSONNodeDumper::createPointerRepresentation(const void *Ptr) {
268   // Because JSON stores integer values as signed 64-bit integers, trying to
269   // represent them as such makes for very ugly pointer values in the resulting
270   // output. Instead, we convert the value to hex and treat it as a string.
271   return "0x" + llvm::utohexstr(reinterpret_cast<uint64_t>(Ptr), true);
272 }
273 
274 llvm::json::Object JSONNodeDumper::createQualType(QualType QT, bool Desugar) {
275   SplitQualType SQT = QT.split();
276   llvm::json::Object Ret{{"qualType", QualType::getAsString(SQT, PrintPolicy)}};
277 
278   if (Desugar && !QT.isNull()) {
279     SplitQualType DSQT = QT.getSplitDesugaredType();
280     if (DSQT != SQT)
281       Ret["desugaredQualType"] = QualType::getAsString(DSQT, PrintPolicy);
282     if (const auto *TT = QT->getAs<TypedefType>())
283       Ret["typeAliasDeclId"] = createPointerRepresentation(TT->getDecl());
284   }
285   return Ret;
286 }
287 
288 void JSONNodeDumper::writeBareDeclRef(const Decl *D) {
289   JOS.attribute("id", createPointerRepresentation(D));
290   if (!D)
291     return;
292 
293   JOS.attribute("kind", (llvm::Twine(D->getDeclKindName()) + "Decl").str());
294   if (const auto *ND = dyn_cast<NamedDecl>(D))
295     JOS.attribute("name", ND->getDeclName().getAsString());
296   if (const auto *VD = dyn_cast<ValueDecl>(D))
297     JOS.attribute("type", createQualType(VD->getType()));
298 }
299 
300 llvm::json::Object JSONNodeDumper::createBareDeclRef(const Decl *D) {
301   llvm::json::Object Ret{{"id", createPointerRepresentation(D)}};
302   if (!D)
303     return Ret;
304 
305   Ret["kind"] = (llvm::Twine(D->getDeclKindName()) + "Decl").str();
306   if (const auto *ND = dyn_cast<NamedDecl>(D))
307     Ret["name"] = ND->getDeclName().getAsString();
308   if (const auto *VD = dyn_cast<ValueDecl>(D))
309     Ret["type"] = createQualType(VD->getType());
310   return Ret;
311 }
312 
313 llvm::json::Array JSONNodeDumper::createCastPath(const CastExpr *C) {
314   llvm::json::Array Ret;
315   if (C->path_empty())
316     return Ret;
317 
318   for (auto I = C->path_begin(), E = C->path_end(); I != E; ++I) {
319     const CXXBaseSpecifier *Base = *I;
320     const auto *RD =
321         cast<CXXRecordDecl>(Base->getType()->castAs<RecordType>()->getDecl());
322 
323     llvm::json::Object Val{{"name", RD->getName()}};
324     if (Base->isVirtual())
325       Val["isVirtual"] = true;
326     Ret.push_back(std::move(Val));
327   }
328   return Ret;
329 }
330 
331 #define FIELD2(Name, Flag)  if (RD->Flag()) Ret[Name] = true
332 #define FIELD1(Flag)        FIELD2(#Flag, Flag)
333 
334 static llvm::json::Object
335 createDefaultConstructorDefinitionData(const CXXRecordDecl *RD) {
336   llvm::json::Object Ret;
337 
338   FIELD2("exists", hasDefaultConstructor);
339   FIELD2("trivial", hasTrivialDefaultConstructor);
340   FIELD2("nonTrivial", hasNonTrivialDefaultConstructor);
341   FIELD2("userProvided", hasUserProvidedDefaultConstructor);
342   FIELD2("isConstexpr", hasConstexprDefaultConstructor);
343   FIELD2("needsImplicit", needsImplicitDefaultConstructor);
344   FIELD2("defaultedIsConstexpr", defaultedDefaultConstructorIsConstexpr);
345 
346   return Ret;
347 }
348 
349 static llvm::json::Object
350 createCopyConstructorDefinitionData(const CXXRecordDecl *RD) {
351   llvm::json::Object Ret;
352 
353   FIELD2("simple", hasSimpleCopyConstructor);
354   FIELD2("trivial", hasTrivialCopyConstructor);
355   FIELD2("nonTrivial", hasNonTrivialCopyConstructor);
356   FIELD2("userDeclared", hasUserDeclaredCopyConstructor);
357   FIELD2("hasConstParam", hasCopyConstructorWithConstParam);
358   FIELD2("implicitHasConstParam", implicitCopyConstructorHasConstParam);
359   FIELD2("needsImplicit", needsImplicitCopyConstructor);
360   FIELD2("needsOverloadResolution", needsOverloadResolutionForCopyConstructor);
361   if (!RD->needsOverloadResolutionForCopyConstructor())
362     FIELD2("defaultedIsDeleted", defaultedCopyConstructorIsDeleted);
363 
364   return Ret;
365 }
366 
367 static llvm::json::Object
368 createMoveConstructorDefinitionData(const CXXRecordDecl *RD) {
369   llvm::json::Object Ret;
370 
371   FIELD2("exists", hasMoveConstructor);
372   FIELD2("simple", hasSimpleMoveConstructor);
373   FIELD2("trivial", hasTrivialMoveConstructor);
374   FIELD2("nonTrivial", hasNonTrivialMoveConstructor);
375   FIELD2("userDeclared", hasUserDeclaredMoveConstructor);
376   FIELD2("needsImplicit", needsImplicitMoveConstructor);
377   FIELD2("needsOverloadResolution", needsOverloadResolutionForMoveConstructor);
378   if (!RD->needsOverloadResolutionForMoveConstructor())
379     FIELD2("defaultedIsDeleted", defaultedMoveConstructorIsDeleted);
380 
381   return Ret;
382 }
383 
384 static llvm::json::Object
385 createCopyAssignmentDefinitionData(const CXXRecordDecl *RD) {
386   llvm::json::Object Ret;
387 
388   FIELD2("trivial", hasTrivialCopyAssignment);
389   FIELD2("nonTrivial", hasNonTrivialCopyAssignment);
390   FIELD2("hasConstParam", hasCopyAssignmentWithConstParam);
391   FIELD2("implicitHasConstParam", implicitCopyAssignmentHasConstParam);
392   FIELD2("userDeclared", hasUserDeclaredCopyAssignment);
393   FIELD2("needsImplicit", needsImplicitCopyAssignment);
394   FIELD2("needsOverloadResolution", needsOverloadResolutionForCopyAssignment);
395 
396   return Ret;
397 }
398 
399 static llvm::json::Object
400 createMoveAssignmentDefinitionData(const CXXRecordDecl *RD) {
401   llvm::json::Object Ret;
402 
403   FIELD2("exists", hasMoveAssignment);
404   FIELD2("simple", hasSimpleMoveAssignment);
405   FIELD2("trivial", hasTrivialMoveAssignment);
406   FIELD2("nonTrivial", hasNonTrivialMoveAssignment);
407   FIELD2("userDeclared", hasUserDeclaredMoveAssignment);
408   FIELD2("needsImplicit", needsImplicitMoveAssignment);
409   FIELD2("needsOverloadResolution", needsOverloadResolutionForMoveAssignment);
410 
411   return Ret;
412 }
413 
414 static llvm::json::Object
415 createDestructorDefinitionData(const CXXRecordDecl *RD) {
416   llvm::json::Object Ret;
417 
418   FIELD2("simple", hasSimpleDestructor);
419   FIELD2("irrelevant", hasIrrelevantDestructor);
420   FIELD2("trivial", hasTrivialDestructor);
421   FIELD2("nonTrivial", hasNonTrivialDestructor);
422   FIELD2("userDeclared", hasUserDeclaredDestructor);
423   FIELD2("needsImplicit", needsImplicitDestructor);
424   FIELD2("needsOverloadResolution", needsOverloadResolutionForDestructor);
425   if (!RD->needsOverloadResolutionForDestructor())
426     FIELD2("defaultedIsDeleted", defaultedDestructorIsDeleted);
427 
428   return Ret;
429 }
430 
431 llvm::json::Object
432 JSONNodeDumper::createCXXRecordDefinitionData(const CXXRecordDecl *RD) {
433   llvm::json::Object Ret;
434 
435   // This data is common to all C++ classes.
436   FIELD1(isGenericLambda);
437   FIELD1(isLambda);
438   FIELD1(isEmpty);
439   FIELD1(isAggregate);
440   FIELD1(isStandardLayout);
441   FIELD1(isTriviallyCopyable);
442   FIELD1(isPOD);
443   FIELD1(isTrivial);
444   FIELD1(isPolymorphic);
445   FIELD1(isAbstract);
446   FIELD1(isLiteral);
447   FIELD1(canPassInRegisters);
448   FIELD1(hasUserDeclaredConstructor);
449   FIELD1(hasConstexprNonCopyMoveConstructor);
450   FIELD1(hasMutableFields);
451   FIELD1(hasVariantMembers);
452   FIELD2("canConstDefaultInit", allowConstDefaultInit);
453 
454   Ret["defaultCtor"] = createDefaultConstructorDefinitionData(RD);
455   Ret["copyCtor"] = createCopyConstructorDefinitionData(RD);
456   Ret["moveCtor"] = createMoveConstructorDefinitionData(RD);
457   Ret["copyAssign"] = createCopyAssignmentDefinitionData(RD);
458   Ret["moveAssign"] = createMoveAssignmentDefinitionData(RD);
459   Ret["dtor"] = createDestructorDefinitionData(RD);
460 
461   return Ret;
462 }
463 
464 #undef FIELD1
465 #undef FIELD2
466 
467 std::string JSONNodeDumper::createAccessSpecifier(AccessSpecifier AS) {
468   switch (AS) {
469   case AS_none: return "none";
470   case AS_private: return "private";
471   case AS_protected: return "protected";
472   case AS_public: return "public";
473   }
474   llvm_unreachable("Unknown access specifier");
475 }
476 
477 llvm::json::Object
478 JSONNodeDumper::createCXXBaseSpecifier(const CXXBaseSpecifier &BS) {
479   llvm::json::Object Ret;
480 
481   Ret["type"] = createQualType(BS.getType());
482   Ret["access"] = createAccessSpecifier(BS.getAccessSpecifier());
483   Ret["writtenAccess"] =
484       createAccessSpecifier(BS.getAccessSpecifierAsWritten());
485   if (BS.isVirtual())
486     Ret["isVirtual"] = true;
487   if (BS.isPackExpansion())
488     Ret["isPackExpansion"] = true;
489 
490   return Ret;
491 }
492 
493 void JSONNodeDumper::VisitTypedefType(const TypedefType *TT) {
494   JOS.attribute("decl", createBareDeclRef(TT->getDecl()));
495 }
496 
497 void JSONNodeDumper::VisitFunctionType(const FunctionType *T) {
498   FunctionType::ExtInfo E = T->getExtInfo();
499   attributeOnlyIfTrue("noreturn", E.getNoReturn());
500   attributeOnlyIfTrue("producesResult", E.getProducesResult());
501   if (E.getHasRegParm())
502     JOS.attribute("regParm", E.getRegParm());
503   JOS.attribute("cc", FunctionType::getNameForCallConv(E.getCC()));
504 }
505 
506 void JSONNodeDumper::VisitFunctionProtoType(const FunctionProtoType *T) {
507   FunctionProtoType::ExtProtoInfo E = T->getExtProtoInfo();
508   attributeOnlyIfTrue("trailingReturn", E.HasTrailingReturn);
509   attributeOnlyIfTrue("const", T->isConst());
510   attributeOnlyIfTrue("volatile", T->isVolatile());
511   attributeOnlyIfTrue("restrict", T->isRestrict());
512   attributeOnlyIfTrue("variadic", E.Variadic);
513   switch (E.RefQualifier) {
514   case RQ_LValue: JOS.attribute("refQualifier", "&"); break;
515   case RQ_RValue: JOS.attribute("refQualifier", "&&"); break;
516   case RQ_None: break;
517   }
518   switch (E.ExceptionSpec.Type) {
519   case EST_DynamicNone:
520   case EST_Dynamic: {
521     JOS.attribute("exceptionSpec", "throw");
522     llvm::json::Array Types;
523     for (QualType QT : E.ExceptionSpec.Exceptions)
524       Types.push_back(createQualType(QT));
525     JOS.attribute("exceptionTypes", std::move(Types));
526   } break;
527   case EST_MSAny:
528     JOS.attribute("exceptionSpec", "throw");
529     JOS.attribute("throwsAny", true);
530     break;
531   case EST_BasicNoexcept:
532     JOS.attribute("exceptionSpec", "noexcept");
533     break;
534   case EST_NoexceptTrue:
535   case EST_NoexceptFalse:
536     JOS.attribute("exceptionSpec", "noexcept");
537     JOS.attribute("conditionEvaluatesTo",
538                 E.ExceptionSpec.Type == EST_NoexceptTrue);
539     //JOS.attributeWithCall("exceptionSpecExpr",
540     //                    [this, E]() { Visit(E.ExceptionSpec.NoexceptExpr); });
541     break;
542   case EST_NoThrow:
543     JOS.attribute("exceptionSpec", "nothrow");
544     break;
545   // FIXME: I cannot find a way to trigger these cases while dumping the AST. I
546   // suspect you can only run into them when executing an AST dump from within
547   // the debugger, which is not a use case we worry about for the JSON dumping
548   // feature.
549   case EST_DependentNoexcept:
550   case EST_Unevaluated:
551   case EST_Uninstantiated:
552   case EST_Unparsed:
553   case EST_None: break;
554   }
555   VisitFunctionType(T);
556 }
557 
558 void JSONNodeDumper::VisitRValueReferenceType(const ReferenceType *RT) {
559   attributeOnlyIfTrue("spelledAsLValue", RT->isSpelledAsLValue());
560 }
561 
562 void JSONNodeDumper::VisitArrayType(const ArrayType *AT) {
563   switch (AT->getSizeModifier()) {
564   case ArrayType::Star:
565     JOS.attribute("sizeModifier", "*");
566     break;
567   case ArrayType::Static:
568     JOS.attribute("sizeModifier", "static");
569     break;
570   case ArrayType::Normal:
571     break;
572   }
573 
574   std::string Str = AT->getIndexTypeQualifiers().getAsString();
575   if (!Str.empty())
576     JOS.attribute("indexTypeQualifiers", Str);
577 }
578 
579 void JSONNodeDumper::VisitConstantArrayType(const ConstantArrayType *CAT) {
580   // FIXME: this should use ZExt instead of SExt, but JSON doesn't allow a
581   // narrowing conversion to int64_t so it cannot be expressed.
582   JOS.attribute("size", CAT->getSize().getSExtValue());
583   VisitArrayType(CAT);
584 }
585 
586 void JSONNodeDumper::VisitDependentSizedExtVectorType(
587     const DependentSizedExtVectorType *VT) {
588   JOS.attributeObject(
589       "attrLoc", [VT, this] { writeSourceLocation(VT->getAttributeLoc()); });
590 }
591 
592 void JSONNodeDumper::VisitVectorType(const VectorType *VT) {
593   JOS.attribute("numElements", VT->getNumElements());
594   switch (VT->getVectorKind()) {
595   case VectorType::GenericVector:
596     break;
597   case VectorType::AltiVecVector:
598     JOS.attribute("vectorKind", "altivec");
599     break;
600   case VectorType::AltiVecPixel:
601     JOS.attribute("vectorKind", "altivec pixel");
602     break;
603   case VectorType::AltiVecBool:
604     JOS.attribute("vectorKind", "altivec bool");
605     break;
606   case VectorType::NeonVector:
607     JOS.attribute("vectorKind", "neon");
608     break;
609   case VectorType::NeonPolyVector:
610     JOS.attribute("vectorKind", "neon poly");
611     break;
612   }
613 }
614 
615 void JSONNodeDumper::VisitUnresolvedUsingType(const UnresolvedUsingType *UUT) {
616   JOS.attribute("decl", createBareDeclRef(UUT->getDecl()));
617 }
618 
619 void JSONNodeDumper::VisitUnaryTransformType(const UnaryTransformType *UTT) {
620   switch (UTT->getUTTKind()) {
621   case UnaryTransformType::EnumUnderlyingType:
622     JOS.attribute("transformKind", "underlying_type");
623     break;
624   }
625 }
626 
627 void JSONNodeDumper::VisitTagType(const TagType *TT) {
628   JOS.attribute("decl", createBareDeclRef(TT->getDecl()));
629 }
630 
631 void JSONNodeDumper::VisitTemplateTypeParmType(
632     const TemplateTypeParmType *TTPT) {
633   JOS.attribute("depth", TTPT->getDepth());
634   JOS.attribute("index", TTPT->getIndex());
635   attributeOnlyIfTrue("isPack", TTPT->isParameterPack());
636   JOS.attribute("decl", createBareDeclRef(TTPT->getDecl()));
637 }
638 
639 void JSONNodeDumper::VisitAutoType(const AutoType *AT) {
640   JOS.attribute("undeduced", !AT->isDeduced());
641   switch (AT->getKeyword()) {
642   case AutoTypeKeyword::Auto:
643     JOS.attribute("typeKeyword", "auto");
644     break;
645   case AutoTypeKeyword::DecltypeAuto:
646     JOS.attribute("typeKeyword", "decltype(auto)");
647     break;
648   case AutoTypeKeyword::GNUAutoType:
649     JOS.attribute("typeKeyword", "__auto_type");
650     break;
651   }
652 }
653 
654 void JSONNodeDumper::VisitTemplateSpecializationType(
655     const TemplateSpecializationType *TST) {
656   attributeOnlyIfTrue("isAlias", TST->isTypeAlias());
657 
658   std::string Str;
659   llvm::raw_string_ostream OS(Str);
660   TST->getTemplateName().print(OS, PrintPolicy);
661   JOS.attribute("templateName", OS.str());
662 }
663 
664 void JSONNodeDumper::VisitInjectedClassNameType(
665     const InjectedClassNameType *ICNT) {
666   JOS.attribute("decl", createBareDeclRef(ICNT->getDecl()));
667 }
668 
669 void JSONNodeDumper::VisitObjCInterfaceType(const ObjCInterfaceType *OIT) {
670   JOS.attribute("decl", createBareDeclRef(OIT->getDecl()));
671 }
672 
673 void JSONNodeDumper::VisitPackExpansionType(const PackExpansionType *PET) {
674   if (llvm::Optional<unsigned> N = PET->getNumExpansions())
675     JOS.attribute("numExpansions", *N);
676 }
677 
678 void JSONNodeDumper::VisitElaboratedType(const ElaboratedType *ET) {
679   if (const NestedNameSpecifier *NNS = ET->getQualifier()) {
680     std::string Str;
681     llvm::raw_string_ostream OS(Str);
682     NNS->print(OS, PrintPolicy, /*ResolveTemplateArgs*/ true);
683     JOS.attribute("qualifier", OS.str());
684   }
685   if (const TagDecl *TD = ET->getOwnedTagDecl())
686     JOS.attribute("ownedTagDecl", createBareDeclRef(TD));
687 }
688 
689 void JSONNodeDumper::VisitMacroQualifiedType(const MacroQualifiedType *MQT) {
690   JOS.attribute("macroName", MQT->getMacroIdentifier()->getName());
691 }
692 
693 void JSONNodeDumper::VisitMemberPointerType(const MemberPointerType *MPT) {
694   attributeOnlyIfTrue("isData", MPT->isMemberDataPointer());
695   attributeOnlyIfTrue("isFunction", MPT->isMemberFunctionPointer());
696 }
697 
698 void JSONNodeDumper::VisitNamedDecl(const NamedDecl *ND) {
699   if (ND && ND->getDeclName()) {
700     JOS.attribute("name", ND->getNameAsString());
701     std::string MangledName = ASTNameGen.getName(ND);
702     if (!MangledName.empty())
703       JOS.attribute("mangledName", MangledName);
704   }
705 }
706 
707 void JSONNodeDumper::VisitTypedefDecl(const TypedefDecl *TD) {
708   VisitNamedDecl(TD);
709   JOS.attribute("type", createQualType(TD->getUnderlyingType()));
710 }
711 
712 void JSONNodeDumper::VisitTypeAliasDecl(const TypeAliasDecl *TAD) {
713   VisitNamedDecl(TAD);
714   JOS.attribute("type", createQualType(TAD->getUnderlyingType()));
715 }
716 
717 void JSONNodeDumper::VisitNamespaceDecl(const NamespaceDecl *ND) {
718   VisitNamedDecl(ND);
719   attributeOnlyIfTrue("isInline", ND->isInline());
720   if (!ND->isOriginalNamespace())
721     JOS.attribute("originalNamespace",
722                   createBareDeclRef(ND->getOriginalNamespace()));
723 }
724 
725 void JSONNodeDumper::VisitUsingDirectiveDecl(const UsingDirectiveDecl *UDD) {
726   JOS.attribute("nominatedNamespace",
727                 createBareDeclRef(UDD->getNominatedNamespace()));
728 }
729 
730 void JSONNodeDumper::VisitNamespaceAliasDecl(const NamespaceAliasDecl *NAD) {
731   VisitNamedDecl(NAD);
732   JOS.attribute("aliasedNamespace",
733                 createBareDeclRef(NAD->getAliasedNamespace()));
734 }
735 
736 void JSONNodeDumper::VisitUsingDecl(const UsingDecl *UD) {
737   std::string Name;
738   if (const NestedNameSpecifier *NNS = UD->getQualifier()) {
739     llvm::raw_string_ostream SOS(Name);
740     NNS->print(SOS, UD->getASTContext().getPrintingPolicy());
741   }
742   Name += UD->getNameAsString();
743   JOS.attribute("name", Name);
744 }
745 
746 void JSONNodeDumper::VisitUsingShadowDecl(const UsingShadowDecl *USD) {
747   JOS.attribute("target", createBareDeclRef(USD->getTargetDecl()));
748 }
749 
750 void JSONNodeDumper::VisitVarDecl(const VarDecl *VD) {
751   VisitNamedDecl(VD);
752   JOS.attribute("type", createQualType(VD->getType()));
753 
754   StorageClass SC = VD->getStorageClass();
755   if (SC != SC_None)
756     JOS.attribute("storageClass", VarDecl::getStorageClassSpecifierString(SC));
757   switch (VD->getTLSKind()) {
758   case VarDecl::TLS_Dynamic: JOS.attribute("tls", "dynamic"); break;
759   case VarDecl::TLS_Static: JOS.attribute("tls", "static"); break;
760   case VarDecl::TLS_None: break;
761   }
762   attributeOnlyIfTrue("nrvo", VD->isNRVOVariable());
763   attributeOnlyIfTrue("inline", VD->isInline());
764   attributeOnlyIfTrue("constexpr", VD->isConstexpr());
765   attributeOnlyIfTrue("modulePrivate", VD->isModulePrivate());
766   if (VD->hasInit()) {
767     switch (VD->getInitStyle()) {
768     case VarDecl::CInit: JOS.attribute("init", "c");  break;
769     case VarDecl::CallInit: JOS.attribute("init", "call"); break;
770     case VarDecl::ListInit: JOS.attribute("init", "list"); break;
771     }
772   }
773   attributeOnlyIfTrue("isParameterPack", VD->isParameterPack());
774 }
775 
776 void JSONNodeDumper::VisitFieldDecl(const FieldDecl *FD) {
777   VisitNamedDecl(FD);
778   JOS.attribute("type", createQualType(FD->getType()));
779   attributeOnlyIfTrue("mutable", FD->isMutable());
780   attributeOnlyIfTrue("modulePrivate", FD->isModulePrivate());
781   attributeOnlyIfTrue("isBitfield", FD->isBitField());
782   attributeOnlyIfTrue("hasInClassInitializer", FD->hasInClassInitializer());
783 }
784 
785 void JSONNodeDumper::VisitFunctionDecl(const FunctionDecl *FD) {
786   VisitNamedDecl(FD);
787   JOS.attribute("type", createQualType(FD->getType()));
788   StorageClass SC = FD->getStorageClass();
789   if (SC != SC_None)
790     JOS.attribute("storageClass", VarDecl::getStorageClassSpecifierString(SC));
791   attributeOnlyIfTrue("inline", FD->isInlineSpecified());
792   attributeOnlyIfTrue("virtual", FD->isVirtualAsWritten());
793   attributeOnlyIfTrue("pure", FD->isPure());
794   attributeOnlyIfTrue("explicitlyDeleted", FD->isDeletedAsWritten());
795   attributeOnlyIfTrue("constexpr", FD->isConstexpr());
796   attributeOnlyIfTrue("variadic", FD->isVariadic());
797 
798   if (FD->isDefaulted())
799     JOS.attribute("explicitlyDefaulted",
800                   FD->isDeleted() ? "deleted" : "default");
801 }
802 
803 void JSONNodeDumper::VisitEnumDecl(const EnumDecl *ED) {
804   VisitNamedDecl(ED);
805   if (ED->isFixed())
806     JOS.attribute("fixedUnderlyingType", createQualType(ED->getIntegerType()));
807   if (ED->isScoped())
808     JOS.attribute("scopedEnumTag",
809                   ED->isScopedUsingClassTag() ? "class" : "struct");
810 }
811 void JSONNodeDumper::VisitEnumConstantDecl(const EnumConstantDecl *ECD) {
812   VisitNamedDecl(ECD);
813   JOS.attribute("type", createQualType(ECD->getType()));
814 }
815 
816 void JSONNodeDumper::VisitRecordDecl(const RecordDecl *RD) {
817   VisitNamedDecl(RD);
818   JOS.attribute("tagUsed", RD->getKindName());
819   attributeOnlyIfTrue("completeDefinition", RD->isCompleteDefinition());
820 }
821 void JSONNodeDumper::VisitCXXRecordDecl(const CXXRecordDecl *RD) {
822   VisitRecordDecl(RD);
823 
824   // All other information requires a complete definition.
825   if (!RD->isCompleteDefinition())
826     return;
827 
828   JOS.attribute("definitionData", createCXXRecordDefinitionData(RD));
829   if (RD->getNumBases()) {
830     JOS.attributeArray("bases", [this, RD] {
831       for (const auto &Spec : RD->bases())
832         JOS.value(createCXXBaseSpecifier(Spec));
833     });
834   }
835 }
836 
837 void JSONNodeDumper::VisitTemplateTypeParmDecl(const TemplateTypeParmDecl *D) {
838   VisitNamedDecl(D);
839   JOS.attribute("tagUsed", D->wasDeclaredWithTypename() ? "typename" : "class");
840   JOS.attribute("depth", D->getDepth());
841   JOS.attribute("index", D->getIndex());
842   attributeOnlyIfTrue("isParameterPack", D->isParameterPack());
843 
844   if (D->hasDefaultArgument())
845     JOS.attributeObject("defaultArg", [=] {
846       Visit(D->getDefaultArgument(), SourceRange(),
847             D->getDefaultArgStorage().getInheritedFrom(),
848             D->defaultArgumentWasInherited() ? "inherited from" : "previous");
849     });
850 }
851 
852 void JSONNodeDumper::VisitNonTypeTemplateParmDecl(
853     const NonTypeTemplateParmDecl *D) {
854   VisitNamedDecl(D);
855   JOS.attribute("type", createQualType(D->getType()));
856   JOS.attribute("depth", D->getDepth());
857   JOS.attribute("index", D->getIndex());
858   attributeOnlyIfTrue("isParameterPack", D->isParameterPack());
859 
860   if (D->hasDefaultArgument())
861     JOS.attributeObject("defaultArg", [=] {
862       Visit(D->getDefaultArgument(), SourceRange(),
863             D->getDefaultArgStorage().getInheritedFrom(),
864             D->defaultArgumentWasInherited() ? "inherited from" : "previous");
865     });
866 }
867 
868 void JSONNodeDumper::VisitTemplateTemplateParmDecl(
869     const TemplateTemplateParmDecl *D) {
870   VisitNamedDecl(D);
871   JOS.attribute("depth", D->getDepth());
872   JOS.attribute("index", D->getIndex());
873   attributeOnlyIfTrue("isParameterPack", D->isParameterPack());
874 
875   if (D->hasDefaultArgument())
876     JOS.attributeObject("defaultArg", [=] {
877       Visit(D->getDefaultArgument().getArgument(),
878             D->getDefaultArgStorage().getInheritedFrom()->getSourceRange(),
879             D->getDefaultArgStorage().getInheritedFrom(),
880             D->defaultArgumentWasInherited() ? "inherited from" : "previous");
881     });
882 }
883 
884 void JSONNodeDumper::VisitLinkageSpecDecl(const LinkageSpecDecl *LSD) {
885   StringRef Lang;
886   switch (LSD->getLanguage()) {
887   case LinkageSpecDecl::lang_c: Lang = "C"; break;
888   case LinkageSpecDecl::lang_cxx: Lang = "C++"; break;
889   }
890   JOS.attribute("language", Lang);
891   attributeOnlyIfTrue("hasBraces", LSD->hasBraces());
892 }
893 
894 void JSONNodeDumper::VisitAccessSpecDecl(const AccessSpecDecl *ASD) {
895   JOS.attribute("access", createAccessSpecifier(ASD->getAccess()));
896 }
897 
898 void JSONNodeDumper::VisitFriendDecl(const FriendDecl *FD) {
899   if (const TypeSourceInfo *T = FD->getFriendType())
900     JOS.attribute("type", createQualType(T->getType()));
901 }
902 
903 void JSONNodeDumper::VisitObjCIvarDecl(const ObjCIvarDecl *D) {
904   VisitNamedDecl(D);
905   JOS.attribute("type", createQualType(D->getType()));
906   attributeOnlyIfTrue("synthesized", D->getSynthesize());
907   switch (D->getAccessControl()) {
908   case ObjCIvarDecl::None: JOS.attribute("access", "none"); break;
909   case ObjCIvarDecl::Private: JOS.attribute("access", "private"); break;
910   case ObjCIvarDecl::Protected: JOS.attribute("access", "protected"); break;
911   case ObjCIvarDecl::Public: JOS.attribute("access", "public"); break;
912   case ObjCIvarDecl::Package: JOS.attribute("access", "package"); break;
913   }
914 }
915 
916 void JSONNodeDumper::VisitObjCMethodDecl(const ObjCMethodDecl *D) {
917   VisitNamedDecl(D);
918   JOS.attribute("returnType", createQualType(D->getReturnType()));
919   JOS.attribute("instance", D->isInstanceMethod());
920   attributeOnlyIfTrue("variadic", D->isVariadic());
921 }
922 
923 void JSONNodeDumper::VisitObjCTypeParamDecl(const ObjCTypeParamDecl *D) {
924   VisitNamedDecl(D);
925   JOS.attribute("type", createQualType(D->getUnderlyingType()));
926   attributeOnlyIfTrue("bounded", D->hasExplicitBound());
927   switch (D->getVariance()) {
928   case ObjCTypeParamVariance::Invariant:
929     break;
930   case ObjCTypeParamVariance::Covariant:
931     JOS.attribute("variance", "covariant");
932     break;
933   case ObjCTypeParamVariance::Contravariant:
934     JOS.attribute("variance", "contravariant");
935     break;
936   }
937 }
938 
939 void JSONNodeDumper::VisitObjCCategoryDecl(const ObjCCategoryDecl *D) {
940   VisitNamedDecl(D);
941   JOS.attribute("interface", createBareDeclRef(D->getClassInterface()));
942   JOS.attribute("implementation", createBareDeclRef(D->getImplementation()));
943 
944   llvm::json::Array Protocols;
945   for (const auto* P : D->protocols())
946     Protocols.push_back(createBareDeclRef(P));
947   if (!Protocols.empty())
948     JOS.attribute("protocols", std::move(Protocols));
949 }
950 
951 void JSONNodeDumper::VisitObjCCategoryImplDecl(const ObjCCategoryImplDecl *D) {
952   VisitNamedDecl(D);
953   JOS.attribute("interface", createBareDeclRef(D->getClassInterface()));
954   JOS.attribute("categoryDecl", createBareDeclRef(D->getCategoryDecl()));
955 }
956 
957 void JSONNodeDumper::VisitObjCProtocolDecl(const ObjCProtocolDecl *D) {
958   VisitNamedDecl(D);
959 
960   llvm::json::Array Protocols;
961   for (const auto *P : D->protocols())
962     Protocols.push_back(createBareDeclRef(P));
963   if (!Protocols.empty())
964     JOS.attribute("protocols", std::move(Protocols));
965 }
966 
967 void JSONNodeDumper::VisitObjCInterfaceDecl(const ObjCInterfaceDecl *D) {
968   VisitNamedDecl(D);
969   JOS.attribute("super", createBareDeclRef(D->getSuperClass()));
970   JOS.attribute("implementation", createBareDeclRef(D->getImplementation()));
971 
972   llvm::json::Array Protocols;
973   for (const auto* P : D->protocols())
974     Protocols.push_back(createBareDeclRef(P));
975   if (!Protocols.empty())
976     JOS.attribute("protocols", std::move(Protocols));
977 }
978 
979 void JSONNodeDumper::VisitObjCImplementationDecl(
980     const ObjCImplementationDecl *D) {
981   VisitNamedDecl(D);
982   JOS.attribute("super", createBareDeclRef(D->getSuperClass()));
983   JOS.attribute("interface", createBareDeclRef(D->getClassInterface()));
984 }
985 
986 void JSONNodeDumper::VisitObjCCompatibleAliasDecl(
987     const ObjCCompatibleAliasDecl *D) {
988   VisitNamedDecl(D);
989   JOS.attribute("interface", createBareDeclRef(D->getClassInterface()));
990 }
991 
992 void JSONNodeDumper::VisitObjCPropertyDecl(const ObjCPropertyDecl *D) {
993   VisitNamedDecl(D);
994   JOS.attribute("type", createQualType(D->getType()));
995 
996   switch (D->getPropertyImplementation()) {
997   case ObjCPropertyDecl::None: break;
998   case ObjCPropertyDecl::Required: JOS.attribute("control", "required"); break;
999   case ObjCPropertyDecl::Optional: JOS.attribute("control", "optional"); break;
1000   }
1001 
1002   ObjCPropertyDecl::PropertyAttributeKind Attrs = D->getPropertyAttributes();
1003   if (Attrs != ObjCPropertyDecl::OBJC_PR_noattr) {
1004     if (Attrs & ObjCPropertyDecl::OBJC_PR_getter)
1005       JOS.attribute("getter", createBareDeclRef(D->getGetterMethodDecl()));
1006     if (Attrs & ObjCPropertyDecl::OBJC_PR_setter)
1007       JOS.attribute("setter", createBareDeclRef(D->getSetterMethodDecl()));
1008     attributeOnlyIfTrue("readonly", Attrs & ObjCPropertyDecl::OBJC_PR_readonly);
1009     attributeOnlyIfTrue("assign", Attrs & ObjCPropertyDecl::OBJC_PR_assign);
1010     attributeOnlyIfTrue("readwrite",
1011                         Attrs & ObjCPropertyDecl::OBJC_PR_readwrite);
1012     attributeOnlyIfTrue("retain", Attrs & ObjCPropertyDecl::OBJC_PR_retain);
1013     attributeOnlyIfTrue("copy", Attrs & ObjCPropertyDecl::OBJC_PR_copy);
1014     attributeOnlyIfTrue("nonatomic",
1015                         Attrs & ObjCPropertyDecl::OBJC_PR_nonatomic);
1016     attributeOnlyIfTrue("atomic", Attrs & ObjCPropertyDecl::OBJC_PR_atomic);
1017     attributeOnlyIfTrue("weak", Attrs & ObjCPropertyDecl::OBJC_PR_weak);
1018     attributeOnlyIfTrue("strong", Attrs & ObjCPropertyDecl::OBJC_PR_strong);
1019     attributeOnlyIfTrue("unsafe_unretained",
1020                         Attrs & ObjCPropertyDecl::OBJC_PR_unsafe_unretained);
1021     attributeOnlyIfTrue("class", Attrs & ObjCPropertyDecl::OBJC_PR_class);
1022     attributeOnlyIfTrue("direct", Attrs & ObjCPropertyDecl::OBJC_PR_direct);
1023     attributeOnlyIfTrue("nullability",
1024                         Attrs & ObjCPropertyDecl::OBJC_PR_nullability);
1025     attributeOnlyIfTrue("null_resettable",
1026                         Attrs & ObjCPropertyDecl::OBJC_PR_null_resettable);
1027   }
1028 }
1029 
1030 void JSONNodeDumper::VisitObjCPropertyImplDecl(const ObjCPropertyImplDecl *D) {
1031   VisitNamedDecl(D->getPropertyDecl());
1032   JOS.attribute("implKind", D->getPropertyImplementation() ==
1033                                     ObjCPropertyImplDecl::Synthesize
1034                                 ? "synthesize"
1035                                 : "dynamic");
1036   JOS.attribute("propertyDecl", createBareDeclRef(D->getPropertyDecl()));
1037   JOS.attribute("ivarDecl", createBareDeclRef(D->getPropertyIvarDecl()));
1038 }
1039 
1040 void JSONNodeDumper::VisitBlockDecl(const BlockDecl *D) {
1041   attributeOnlyIfTrue("variadic", D->isVariadic());
1042   attributeOnlyIfTrue("capturesThis", D->capturesCXXThis());
1043 }
1044 
1045 void JSONNodeDumper::VisitObjCEncodeExpr(const ObjCEncodeExpr *OEE) {
1046   JOS.attribute("encodedType", createQualType(OEE->getEncodedType()));
1047 }
1048 
1049 void JSONNodeDumper::VisitObjCMessageExpr(const ObjCMessageExpr *OME) {
1050   std::string Str;
1051   llvm::raw_string_ostream OS(Str);
1052 
1053   OME->getSelector().print(OS);
1054   JOS.attribute("selector", OS.str());
1055 
1056   switch (OME->getReceiverKind()) {
1057   case ObjCMessageExpr::Instance:
1058     JOS.attribute("receiverKind", "instance");
1059     break;
1060   case ObjCMessageExpr::Class:
1061     JOS.attribute("receiverKind", "class");
1062     JOS.attribute("classType", createQualType(OME->getClassReceiver()));
1063     break;
1064   case ObjCMessageExpr::SuperInstance:
1065     JOS.attribute("receiverKind", "super (instance)");
1066     JOS.attribute("superType", createQualType(OME->getSuperType()));
1067     break;
1068   case ObjCMessageExpr::SuperClass:
1069     JOS.attribute("receiverKind", "super (class)");
1070     JOS.attribute("superType", createQualType(OME->getSuperType()));
1071     break;
1072   }
1073 
1074   QualType CallReturnTy = OME->getCallReturnType(Ctx);
1075   if (OME->getType() != CallReturnTy)
1076     JOS.attribute("callReturnType", createQualType(CallReturnTy));
1077 }
1078 
1079 void JSONNodeDumper::VisitObjCBoxedExpr(const ObjCBoxedExpr *OBE) {
1080   if (const ObjCMethodDecl *MD = OBE->getBoxingMethod()) {
1081     std::string Str;
1082     llvm::raw_string_ostream OS(Str);
1083 
1084     MD->getSelector().print(OS);
1085     JOS.attribute("selector", OS.str());
1086   }
1087 }
1088 
1089 void JSONNodeDumper::VisitObjCSelectorExpr(const ObjCSelectorExpr *OSE) {
1090   std::string Str;
1091   llvm::raw_string_ostream OS(Str);
1092 
1093   OSE->getSelector().print(OS);
1094   JOS.attribute("selector", OS.str());
1095 }
1096 
1097 void JSONNodeDumper::VisitObjCProtocolExpr(const ObjCProtocolExpr *OPE) {
1098   JOS.attribute("protocol", createBareDeclRef(OPE->getProtocol()));
1099 }
1100 
1101 void JSONNodeDumper::VisitObjCPropertyRefExpr(const ObjCPropertyRefExpr *OPRE) {
1102   if (OPRE->isImplicitProperty()) {
1103     JOS.attribute("propertyKind", "implicit");
1104     if (const ObjCMethodDecl *MD = OPRE->getImplicitPropertyGetter())
1105       JOS.attribute("getter", createBareDeclRef(MD));
1106     if (const ObjCMethodDecl *MD = OPRE->getImplicitPropertySetter())
1107       JOS.attribute("setter", createBareDeclRef(MD));
1108   } else {
1109     JOS.attribute("propertyKind", "explicit");
1110     JOS.attribute("property", createBareDeclRef(OPRE->getExplicitProperty()));
1111   }
1112 
1113   attributeOnlyIfTrue("isSuperReceiver", OPRE->isSuperReceiver());
1114   attributeOnlyIfTrue("isMessagingGetter", OPRE->isMessagingGetter());
1115   attributeOnlyIfTrue("isMessagingSetter", OPRE->isMessagingSetter());
1116 }
1117 
1118 void JSONNodeDumper::VisitObjCSubscriptRefExpr(
1119     const ObjCSubscriptRefExpr *OSRE) {
1120   JOS.attribute("subscriptKind",
1121                 OSRE->isArraySubscriptRefExpr() ? "array" : "dictionary");
1122 
1123   if (const ObjCMethodDecl *MD = OSRE->getAtIndexMethodDecl())
1124     JOS.attribute("getter", createBareDeclRef(MD));
1125   if (const ObjCMethodDecl *MD = OSRE->setAtIndexMethodDecl())
1126     JOS.attribute("setter", createBareDeclRef(MD));
1127 }
1128 
1129 void JSONNodeDumper::VisitObjCIvarRefExpr(const ObjCIvarRefExpr *OIRE) {
1130   JOS.attribute("decl", createBareDeclRef(OIRE->getDecl()));
1131   attributeOnlyIfTrue("isFreeIvar", OIRE->isFreeIvar());
1132   JOS.attribute("isArrow", OIRE->isArrow());
1133 }
1134 
1135 void JSONNodeDumper::VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *OBLE) {
1136   JOS.attribute("value", OBLE->getValue() ? "__objc_yes" : "__objc_no");
1137 }
1138 
1139 void JSONNodeDumper::VisitDeclRefExpr(const DeclRefExpr *DRE) {
1140   JOS.attribute("referencedDecl", createBareDeclRef(DRE->getDecl()));
1141   if (DRE->getDecl() != DRE->getFoundDecl())
1142     JOS.attribute("foundReferencedDecl",
1143                   createBareDeclRef(DRE->getFoundDecl()));
1144   switch (DRE->isNonOdrUse()) {
1145   case NOUR_None: break;
1146   case NOUR_Unevaluated: JOS.attribute("nonOdrUseReason", "unevaluated"); break;
1147   case NOUR_Constant: JOS.attribute("nonOdrUseReason", "constant"); break;
1148   case NOUR_Discarded: JOS.attribute("nonOdrUseReason", "discarded"); break;
1149   }
1150 }
1151 
1152 void JSONNodeDumper::VisitPredefinedExpr(const PredefinedExpr *PE) {
1153   JOS.attribute("name", PredefinedExpr::getIdentKindName(PE->getIdentKind()));
1154 }
1155 
1156 void JSONNodeDumper::VisitUnaryOperator(const UnaryOperator *UO) {
1157   JOS.attribute("isPostfix", UO->isPostfix());
1158   JOS.attribute("opcode", UnaryOperator::getOpcodeStr(UO->getOpcode()));
1159   if (!UO->canOverflow())
1160     JOS.attribute("canOverflow", false);
1161 }
1162 
1163 void JSONNodeDumper::VisitBinaryOperator(const BinaryOperator *BO) {
1164   JOS.attribute("opcode", BinaryOperator::getOpcodeStr(BO->getOpcode()));
1165 }
1166 
1167 void JSONNodeDumper::VisitCompoundAssignOperator(
1168     const CompoundAssignOperator *CAO) {
1169   VisitBinaryOperator(CAO);
1170   JOS.attribute("computeLHSType", createQualType(CAO->getComputationLHSType()));
1171   JOS.attribute("computeResultType",
1172                 createQualType(CAO->getComputationResultType()));
1173 }
1174 
1175 void JSONNodeDumper::VisitMemberExpr(const MemberExpr *ME) {
1176   // Note, we always write this Boolean field because the information it conveys
1177   // is critical to understanding the AST node.
1178   ValueDecl *VD = ME->getMemberDecl();
1179   JOS.attribute("name", VD && VD->getDeclName() ? VD->getNameAsString() : "");
1180   JOS.attribute("isArrow", ME->isArrow());
1181   JOS.attribute("referencedMemberDecl", createPointerRepresentation(VD));
1182   switch (ME->isNonOdrUse()) {
1183   case NOUR_None: break;
1184   case NOUR_Unevaluated: JOS.attribute("nonOdrUseReason", "unevaluated"); break;
1185   case NOUR_Constant: JOS.attribute("nonOdrUseReason", "constant"); break;
1186   case NOUR_Discarded: JOS.attribute("nonOdrUseReason", "discarded"); break;
1187   }
1188 }
1189 
1190 void JSONNodeDumper::VisitCXXNewExpr(const CXXNewExpr *NE) {
1191   attributeOnlyIfTrue("isGlobal", NE->isGlobalNew());
1192   attributeOnlyIfTrue("isArray", NE->isArray());
1193   attributeOnlyIfTrue("isPlacement", NE->getNumPlacementArgs() != 0);
1194   switch (NE->getInitializationStyle()) {
1195   case CXXNewExpr::NoInit: break;
1196   case CXXNewExpr::CallInit: JOS.attribute("initStyle", "call"); break;
1197   case CXXNewExpr::ListInit: JOS.attribute("initStyle", "list"); break;
1198   }
1199   if (const FunctionDecl *FD = NE->getOperatorNew())
1200     JOS.attribute("operatorNewDecl", createBareDeclRef(FD));
1201   if (const FunctionDecl *FD = NE->getOperatorDelete())
1202     JOS.attribute("operatorDeleteDecl", createBareDeclRef(FD));
1203 }
1204 void JSONNodeDumper::VisitCXXDeleteExpr(const CXXDeleteExpr *DE) {
1205   attributeOnlyIfTrue("isGlobal", DE->isGlobalDelete());
1206   attributeOnlyIfTrue("isArray", DE->isArrayForm());
1207   attributeOnlyIfTrue("isArrayAsWritten", DE->isArrayFormAsWritten());
1208   if (const FunctionDecl *FD = DE->getOperatorDelete())
1209     JOS.attribute("operatorDeleteDecl", createBareDeclRef(FD));
1210 }
1211 
1212 void JSONNodeDumper::VisitCXXThisExpr(const CXXThisExpr *TE) {
1213   attributeOnlyIfTrue("implicit", TE->isImplicit());
1214 }
1215 
1216 void JSONNodeDumper::VisitCastExpr(const CastExpr *CE) {
1217   JOS.attribute("castKind", CE->getCastKindName());
1218   llvm::json::Array Path = createCastPath(CE);
1219   if (!Path.empty())
1220     JOS.attribute("path", std::move(Path));
1221   // FIXME: This may not be useful information as it can be obtusely gleaned
1222   // from the inner[] array.
1223   if (const NamedDecl *ND = CE->getConversionFunction())
1224     JOS.attribute("conversionFunc", createBareDeclRef(ND));
1225 }
1226 
1227 void JSONNodeDumper::VisitImplicitCastExpr(const ImplicitCastExpr *ICE) {
1228   VisitCastExpr(ICE);
1229   attributeOnlyIfTrue("isPartOfExplicitCast", ICE->isPartOfExplicitCast());
1230 }
1231 
1232 void JSONNodeDumper::VisitCallExpr(const CallExpr *CE) {
1233   attributeOnlyIfTrue("adl", CE->usesADL());
1234 }
1235 
1236 void JSONNodeDumper::VisitUnaryExprOrTypeTraitExpr(
1237     const UnaryExprOrTypeTraitExpr *TTE) {
1238   switch (TTE->getKind()) {
1239   case UETT_SizeOf: JOS.attribute("name", "sizeof"); break;
1240   case UETT_AlignOf: JOS.attribute("name", "alignof"); break;
1241   case UETT_VecStep:  JOS.attribute("name", "vec_step"); break;
1242   case UETT_PreferredAlignOf:  JOS.attribute("name", "__alignof"); break;
1243   case UETT_OpenMPRequiredSimdAlign:
1244     JOS.attribute("name", "__builtin_omp_required_simd_align"); break;
1245   }
1246   if (TTE->isArgumentType())
1247     JOS.attribute("argType", createQualType(TTE->getArgumentType()));
1248 }
1249 
1250 void JSONNodeDumper::VisitSizeOfPackExpr(const SizeOfPackExpr *SOPE) {
1251   VisitNamedDecl(SOPE->getPack());
1252 }
1253 
1254 void JSONNodeDumper::VisitUnresolvedLookupExpr(
1255     const UnresolvedLookupExpr *ULE) {
1256   JOS.attribute("usesADL", ULE->requiresADL());
1257   JOS.attribute("name", ULE->getName().getAsString());
1258 
1259   JOS.attributeArray("lookups", [this, ULE] {
1260     for (const NamedDecl *D : ULE->decls())
1261       JOS.value(createBareDeclRef(D));
1262   });
1263 }
1264 
1265 void JSONNodeDumper::VisitAddrLabelExpr(const AddrLabelExpr *ALE) {
1266   JOS.attribute("name", ALE->getLabel()->getName());
1267   JOS.attribute("labelDeclId", createPointerRepresentation(ALE->getLabel()));
1268 }
1269 
1270 void JSONNodeDumper::VisitCXXTypeidExpr(const CXXTypeidExpr *CTE) {
1271   if (CTE->isTypeOperand()) {
1272     QualType Adjusted = CTE->getTypeOperand(Ctx);
1273     QualType Unadjusted = CTE->getTypeOperandSourceInfo()->getType();
1274     JOS.attribute("typeArg", createQualType(Unadjusted));
1275     if (Adjusted != Unadjusted)
1276       JOS.attribute("adjustedTypeArg", createQualType(Adjusted));
1277   }
1278 }
1279 
1280 void JSONNodeDumper::VisitConstantExpr(const ConstantExpr *CE) {
1281   if (CE->getResultAPValueKind() != APValue::None) {
1282     std::string Str;
1283     llvm::raw_string_ostream OS(Str);
1284     CE->getAPValueResult().printPretty(OS, Ctx, CE->getType());
1285     JOS.attribute("value", OS.str());
1286   }
1287 }
1288 
1289 void JSONNodeDumper::VisitInitListExpr(const InitListExpr *ILE) {
1290   if (const FieldDecl *FD = ILE->getInitializedFieldInUnion())
1291     JOS.attribute("field", createBareDeclRef(FD));
1292 }
1293 
1294 void JSONNodeDumper::VisitGenericSelectionExpr(
1295     const GenericSelectionExpr *GSE) {
1296   attributeOnlyIfTrue("resultDependent", GSE->isResultDependent());
1297 }
1298 
1299 void JSONNodeDumper::VisitCXXUnresolvedConstructExpr(
1300     const CXXUnresolvedConstructExpr *UCE) {
1301   if (UCE->getType() != UCE->getTypeAsWritten())
1302     JOS.attribute("typeAsWritten", createQualType(UCE->getTypeAsWritten()));
1303   attributeOnlyIfTrue("list", UCE->isListInitialization());
1304 }
1305 
1306 void JSONNodeDumper::VisitCXXConstructExpr(const CXXConstructExpr *CE) {
1307   CXXConstructorDecl *Ctor = CE->getConstructor();
1308   JOS.attribute("ctorType", createQualType(Ctor->getType()));
1309   attributeOnlyIfTrue("elidable", CE->isElidable());
1310   attributeOnlyIfTrue("list", CE->isListInitialization());
1311   attributeOnlyIfTrue("initializer_list", CE->isStdInitListInitialization());
1312   attributeOnlyIfTrue("zeroing", CE->requiresZeroInitialization());
1313   attributeOnlyIfTrue("hadMultipleCandidates", CE->hadMultipleCandidates());
1314 
1315   switch (CE->getConstructionKind()) {
1316   case CXXConstructExpr::CK_Complete:
1317     JOS.attribute("constructionKind", "complete");
1318     break;
1319   case CXXConstructExpr::CK_Delegating:
1320     JOS.attribute("constructionKind", "delegating");
1321     break;
1322   case CXXConstructExpr::CK_NonVirtualBase:
1323     JOS.attribute("constructionKind", "non-virtual base");
1324     break;
1325   case CXXConstructExpr::CK_VirtualBase:
1326     JOS.attribute("constructionKind", "virtual base");
1327     break;
1328   }
1329 }
1330 
1331 void JSONNodeDumper::VisitExprWithCleanups(const ExprWithCleanups *EWC) {
1332   attributeOnlyIfTrue("cleanupsHaveSideEffects",
1333                       EWC->cleanupsHaveSideEffects());
1334   if (EWC->getNumObjects()) {
1335     JOS.attributeArray("cleanups", [this, EWC] {
1336       for (const ExprWithCleanups::CleanupObject &CO : EWC->getObjects())
1337         JOS.value(createBareDeclRef(CO));
1338     });
1339   }
1340 }
1341 
1342 void JSONNodeDumper::VisitCXXBindTemporaryExpr(
1343     const CXXBindTemporaryExpr *BTE) {
1344   const CXXTemporary *Temp = BTE->getTemporary();
1345   JOS.attribute("temp", createPointerRepresentation(Temp));
1346   if (const CXXDestructorDecl *Dtor = Temp->getDestructor())
1347     JOS.attribute("dtor", createBareDeclRef(Dtor));
1348 }
1349 
1350 void JSONNodeDumper::VisitMaterializeTemporaryExpr(
1351     const MaterializeTemporaryExpr *MTE) {
1352   if (const ValueDecl *VD = MTE->getExtendingDecl())
1353     JOS.attribute("extendingDecl", createBareDeclRef(VD));
1354 
1355   switch (MTE->getStorageDuration()) {
1356   case SD_Automatic:
1357     JOS.attribute("storageDuration", "automatic");
1358     break;
1359   case SD_Dynamic:
1360     JOS.attribute("storageDuration", "dynamic");
1361     break;
1362   case SD_FullExpression:
1363     JOS.attribute("storageDuration", "full expression");
1364     break;
1365   case SD_Static:
1366     JOS.attribute("storageDuration", "static");
1367     break;
1368   case SD_Thread:
1369     JOS.attribute("storageDuration", "thread");
1370     break;
1371   }
1372 
1373   attributeOnlyIfTrue("boundToLValueRef", MTE->isBoundToLvalueReference());
1374 }
1375 
1376 void JSONNodeDumper::VisitCXXDependentScopeMemberExpr(
1377     const CXXDependentScopeMemberExpr *DSME) {
1378   JOS.attribute("isArrow", DSME->isArrow());
1379   JOS.attribute("member", DSME->getMember().getAsString());
1380   attributeOnlyIfTrue("hasTemplateKeyword", DSME->hasTemplateKeyword());
1381   attributeOnlyIfTrue("hasExplicitTemplateArgs",
1382                       DSME->hasExplicitTemplateArgs());
1383 
1384   if (DSME->getNumTemplateArgs()) {
1385     JOS.attributeArray("explicitTemplateArgs", [DSME, this] {
1386       for (const TemplateArgumentLoc &TAL : DSME->template_arguments())
1387         JOS.object(
1388             [&TAL, this] { Visit(TAL.getArgument(), TAL.getSourceRange()); });
1389     });
1390   }
1391 }
1392 
1393 void JSONNodeDumper::VisitIntegerLiteral(const IntegerLiteral *IL) {
1394   JOS.attribute("value",
1395                 IL->getValue().toString(
1396                     /*Radix=*/10, IL->getType()->isSignedIntegerType()));
1397 }
1398 void JSONNodeDumper::VisitCharacterLiteral(const CharacterLiteral *CL) {
1399   // FIXME: This should probably print the character literal as a string,
1400   // rather than as a numerical value. It would be nice if the behavior matched
1401   // what we do to print a string literal; right now, it is impossible to tell
1402   // the difference between 'a' and L'a' in C from the JSON output.
1403   JOS.attribute("value", CL->getValue());
1404 }
1405 void JSONNodeDumper::VisitFixedPointLiteral(const FixedPointLiteral *FPL) {
1406   JOS.attribute("value", FPL->getValueAsString(/*Radix=*/10));
1407 }
1408 void JSONNodeDumper::VisitFloatingLiteral(const FloatingLiteral *FL) {
1409   llvm::SmallVector<char, 16> Buffer;
1410   FL->getValue().toString(Buffer);
1411   JOS.attribute("value", Buffer);
1412 }
1413 void JSONNodeDumper::VisitStringLiteral(const StringLiteral *SL) {
1414   std::string Buffer;
1415   llvm::raw_string_ostream SS(Buffer);
1416   SL->outputString(SS);
1417   JOS.attribute("value", SS.str());
1418 }
1419 void JSONNodeDumper::VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *BLE) {
1420   JOS.attribute("value", BLE->getValue());
1421 }
1422 
1423 void JSONNodeDumper::VisitIfStmt(const IfStmt *IS) {
1424   attributeOnlyIfTrue("hasInit", IS->hasInitStorage());
1425   attributeOnlyIfTrue("hasVar", IS->hasVarStorage());
1426   attributeOnlyIfTrue("hasElse", IS->hasElseStorage());
1427   attributeOnlyIfTrue("isConstexpr", IS->isConstexpr());
1428 }
1429 
1430 void JSONNodeDumper::VisitSwitchStmt(const SwitchStmt *SS) {
1431   attributeOnlyIfTrue("hasInit", SS->hasInitStorage());
1432   attributeOnlyIfTrue("hasVar", SS->hasVarStorage());
1433 }
1434 void JSONNodeDumper::VisitCaseStmt(const CaseStmt *CS) {
1435   attributeOnlyIfTrue("isGNURange", CS->caseStmtIsGNURange());
1436 }
1437 
1438 void JSONNodeDumper::VisitLabelStmt(const LabelStmt *LS) {
1439   JOS.attribute("name", LS->getName());
1440   JOS.attribute("declId", createPointerRepresentation(LS->getDecl()));
1441 }
1442 void JSONNodeDumper::VisitGotoStmt(const GotoStmt *GS) {
1443   JOS.attribute("targetLabelDeclId",
1444                 createPointerRepresentation(GS->getLabel()));
1445 }
1446 
1447 void JSONNodeDumper::VisitWhileStmt(const WhileStmt *WS) {
1448   attributeOnlyIfTrue("hasVar", WS->hasVarStorage());
1449 }
1450 
1451 void JSONNodeDumper::VisitObjCAtCatchStmt(const ObjCAtCatchStmt* OACS) {
1452   // FIXME: it would be nice for the ASTNodeTraverser would handle the catch
1453   // parameter the same way for C++ and ObjC rather. In this case, C++ gets a
1454   // null child node and ObjC gets no child node.
1455   attributeOnlyIfTrue("isCatchAll", OACS->getCatchParamDecl() == nullptr);
1456 }
1457 
1458 void JSONNodeDumper::VisitNullTemplateArgument(const TemplateArgument &TA) {
1459   JOS.attribute("isNull", true);
1460 }
1461 void JSONNodeDumper::VisitTypeTemplateArgument(const TemplateArgument &TA) {
1462   JOS.attribute("type", createQualType(TA.getAsType()));
1463 }
1464 void JSONNodeDumper::VisitDeclarationTemplateArgument(
1465     const TemplateArgument &TA) {
1466   JOS.attribute("decl", createBareDeclRef(TA.getAsDecl()));
1467 }
1468 void JSONNodeDumper::VisitNullPtrTemplateArgument(const TemplateArgument &TA) {
1469   JOS.attribute("isNullptr", true);
1470 }
1471 void JSONNodeDumper::VisitIntegralTemplateArgument(const TemplateArgument &TA) {
1472   JOS.attribute("value", TA.getAsIntegral().getSExtValue());
1473 }
1474 void JSONNodeDumper::VisitTemplateTemplateArgument(const TemplateArgument &TA) {
1475   // FIXME: cannot just call dump() on the argument, as that doesn't specify
1476   // the output format.
1477 }
1478 void JSONNodeDumper::VisitTemplateExpansionTemplateArgument(
1479     const TemplateArgument &TA) {
1480   // FIXME: cannot just call dump() on the argument, as that doesn't specify
1481   // the output format.
1482 }
1483 void JSONNodeDumper::VisitExpressionTemplateArgument(
1484     const TemplateArgument &TA) {
1485   JOS.attribute("isExpr", true);
1486 }
1487 void JSONNodeDumper::VisitPackTemplateArgument(const TemplateArgument &TA) {
1488   JOS.attribute("isPack", true);
1489 }
1490 
1491 StringRef JSONNodeDumper::getCommentCommandName(unsigned CommandID) const {
1492   if (Traits)
1493     return Traits->getCommandInfo(CommandID)->Name;
1494   if (const comments::CommandInfo *Info =
1495           comments::CommandTraits::getBuiltinCommandInfo(CommandID))
1496     return Info->Name;
1497   return "<invalid>";
1498 }
1499 
1500 void JSONNodeDumper::visitTextComment(const comments::TextComment *C,
1501                                       const comments::FullComment *) {
1502   JOS.attribute("text", C->getText());
1503 }
1504 
1505 void JSONNodeDumper::visitInlineCommandComment(
1506     const comments::InlineCommandComment *C, const comments::FullComment *) {
1507   JOS.attribute("name", getCommentCommandName(C->getCommandID()));
1508 
1509   switch (C->getRenderKind()) {
1510   case comments::InlineCommandComment::RenderNormal:
1511     JOS.attribute("renderKind", "normal");
1512     break;
1513   case comments::InlineCommandComment::RenderBold:
1514     JOS.attribute("renderKind", "bold");
1515     break;
1516   case comments::InlineCommandComment::RenderEmphasized:
1517     JOS.attribute("renderKind", "emphasized");
1518     break;
1519   case comments::InlineCommandComment::RenderMonospaced:
1520     JOS.attribute("renderKind", "monospaced");
1521     break;
1522   case comments::InlineCommandComment::RenderAnchor:
1523     JOS.attribute("renderKind", "anchor");
1524     break;
1525   }
1526 
1527   llvm::json::Array Args;
1528   for (unsigned I = 0, E = C->getNumArgs(); I < E; ++I)
1529     Args.push_back(C->getArgText(I));
1530 
1531   if (!Args.empty())
1532     JOS.attribute("args", std::move(Args));
1533 }
1534 
1535 void JSONNodeDumper::visitHTMLStartTagComment(
1536     const comments::HTMLStartTagComment *C, const comments::FullComment *) {
1537   JOS.attribute("name", C->getTagName());
1538   attributeOnlyIfTrue("selfClosing", C->isSelfClosing());
1539   attributeOnlyIfTrue("malformed", C->isMalformed());
1540 
1541   llvm::json::Array Attrs;
1542   for (unsigned I = 0, E = C->getNumAttrs(); I < E; ++I)
1543     Attrs.push_back(
1544         {{"name", C->getAttr(I).Name}, {"value", C->getAttr(I).Value}});
1545 
1546   if (!Attrs.empty())
1547     JOS.attribute("attrs", std::move(Attrs));
1548 }
1549 
1550 void JSONNodeDumper::visitHTMLEndTagComment(
1551     const comments::HTMLEndTagComment *C, const comments::FullComment *) {
1552   JOS.attribute("name", C->getTagName());
1553 }
1554 
1555 void JSONNodeDumper::visitBlockCommandComment(
1556     const comments::BlockCommandComment *C, const comments::FullComment *) {
1557   JOS.attribute("name", getCommentCommandName(C->getCommandID()));
1558 
1559   llvm::json::Array Args;
1560   for (unsigned I = 0, E = C->getNumArgs(); I < E; ++I)
1561     Args.push_back(C->getArgText(I));
1562 
1563   if (!Args.empty())
1564     JOS.attribute("args", std::move(Args));
1565 }
1566 
1567 void JSONNodeDumper::visitParamCommandComment(
1568     const comments::ParamCommandComment *C, const comments::FullComment *FC) {
1569   switch (C->getDirection()) {
1570   case comments::ParamCommandComment::In:
1571     JOS.attribute("direction", "in");
1572     break;
1573   case comments::ParamCommandComment::Out:
1574     JOS.attribute("direction", "out");
1575     break;
1576   case comments::ParamCommandComment::InOut:
1577     JOS.attribute("direction", "in,out");
1578     break;
1579   }
1580   attributeOnlyIfTrue("explicit", C->isDirectionExplicit());
1581 
1582   if (C->hasParamName())
1583     JOS.attribute("param", C->isParamIndexValid() ? C->getParamName(FC)
1584                                                   : C->getParamNameAsWritten());
1585 
1586   if (C->isParamIndexValid() && !C->isVarArgParam())
1587     JOS.attribute("paramIdx", C->getParamIndex());
1588 }
1589 
1590 void JSONNodeDumper::visitTParamCommandComment(
1591     const comments::TParamCommandComment *C, const comments::FullComment *FC) {
1592   if (C->hasParamName())
1593     JOS.attribute("param", C->isPositionValid() ? C->getParamName(FC)
1594                                                 : C->getParamNameAsWritten());
1595   if (C->isPositionValid()) {
1596     llvm::json::Array Positions;
1597     for (unsigned I = 0, E = C->getDepth(); I < E; ++I)
1598       Positions.push_back(C->getIndex(I));
1599 
1600     if (!Positions.empty())
1601       JOS.attribute("positions", std::move(Positions));
1602   }
1603 }
1604 
1605 void JSONNodeDumper::visitVerbatimBlockComment(
1606     const comments::VerbatimBlockComment *C, const comments::FullComment *) {
1607   JOS.attribute("name", getCommentCommandName(C->getCommandID()));
1608   JOS.attribute("closeName", C->getCloseName());
1609 }
1610 
1611 void JSONNodeDumper::visitVerbatimBlockLineComment(
1612     const comments::VerbatimBlockLineComment *C,
1613     const comments::FullComment *) {
1614   JOS.attribute("text", C->getText());
1615 }
1616 
1617 void JSONNodeDumper::visitVerbatimLineComment(
1618     const comments::VerbatimLineComment *C, const comments::FullComment *) {
1619   JOS.attribute("text", C->getText());
1620 }
1621