xref: /netbsd-src/external/apache2/llvm/dist/clang/lib/AST/JSONNodeDumper.cpp (revision ed75d7a867996c84cfa88e3b8906816277e957f7) 
1 #include "clang/AST/JSONNodeDumper.h"
2 #include "clang/Lex/Lexer.h"
3 #include "llvm/ADT/StringSwitch.h"
4 
5 using namespace clang;
6 
7 void JSONNodeDumper::addPreviousDeclaration(const Decl *D) {
8   switch (D->getKind()) {
9 #define DECL(DERIVED, BASE)                                                    \
10   case Decl::DERIVED:                                                          \
11     return writePreviousDeclImpl(cast<DERIVED##Decl>(D));
12 #define ABSTRACT_DECL(DECL)
13 #include "clang/AST/DeclNodes.inc"
14 #undef ABSTRACT_DECL
15 #undef DECL
16   }
17   llvm_unreachable("Decl that isn't part of DeclNodes.inc!");
18 }
19 
20 void JSONNodeDumper::Visit(const Attr *A) {
21   const char *AttrName = nullptr;
22   switch (A->getKind()) {
23 #define ATTR(X)                                                                \
24   case attr::X:                                                                \
25     AttrName = #X"Attr";                                                       \
26     break;
27 #include "clang/Basic/AttrList.inc"
28 #undef ATTR
29   }
30   JOS.attribute("id", createPointerRepresentation(A));
31   JOS.attribute("kind", AttrName);
32   JOS.attributeObject("range", [A, this] { writeSourceRange(A->getRange()); });
33   attributeOnlyIfTrue("inherited", A->isInherited());
34   attributeOnlyIfTrue("implicit", A->isImplicit());
35 
36   // FIXME: it would be useful for us to output the spelling kind as well as
37   // the actual spelling. This would allow us to distinguish between the
38   // various attribute syntaxes, but we don't currently track that information
39   // within the AST.
40   //JOS.attribute("spelling", A->getSpelling());
41 
42   InnerAttrVisitor::Visit(A);
43 }
44 
45 void JSONNodeDumper::Visit(const Stmt *S) {
46   if (!S)
47     return;
48 
49   JOS.attribute("id", createPointerRepresentation(S));
50   JOS.attribute("kind", S->getStmtClassName());
51   JOS.attributeObject("range",
52                       [S, this] { writeSourceRange(S->getSourceRange()); });
53 
54   if (const auto *E = dyn_cast<Expr>(S)) {
55     JOS.attribute("type", createQualType(E->getType()));
56     const char *Category = nullptr;
57     switch (E->getValueKind()) {
58     case VK_LValue: Category = "lvalue"; break;
59     case VK_XValue: Category = "xvalue"; break;
60     case VK_RValue: Category = "rvalue"; break;
61     }
62     JOS.attribute("valueCategory", Category);
63   }
64   InnerStmtVisitor::Visit(S);
65 }
66 
67 void JSONNodeDumper::Visit(const Type *T) {
68   JOS.attribute("id", createPointerRepresentation(T));
69 
70   if (!T)
71     return;
72 
73   JOS.attribute("kind", (llvm::Twine(T->getTypeClassName()) + "Type").str());
74   JOS.attribute("type", createQualType(QualType(T, 0), /*Desugar*/ false));
75   attributeOnlyIfTrue("isDependent", T->isDependentType());
76   attributeOnlyIfTrue("isInstantiationDependent",
77                       T->isInstantiationDependentType());
78   attributeOnlyIfTrue("isVariablyModified", T->isVariablyModifiedType());
79   attributeOnlyIfTrue("containsUnexpandedPack",
80                       T->containsUnexpandedParameterPack());
81   attributeOnlyIfTrue("isImported", T->isFromAST());
82   InnerTypeVisitor::Visit(T);
83 }
84 
85 void JSONNodeDumper::Visit(QualType T) {
86   JOS.attribute("id", createPointerRepresentation(T.getAsOpaquePtr()));
87   JOS.attribute("kind", "QualType");
88   JOS.attribute("type", createQualType(T));
89   JOS.attribute("qualifiers", T.split().Quals.getAsString());
90 }
91 
92 void JSONNodeDumper::Visit(const Decl *D) {
93   JOS.attribute("id", createPointerRepresentation(D));
94 
95   if (!D)
96     return;
97 
98   JOS.attribute("kind", (llvm::Twine(D->getDeclKindName()) + "Decl").str());
99   JOS.attributeObject("loc",
100                       [D, this] { writeSourceLocation(D->getLocation()); });
101   JOS.attributeObject("range",
102                       [D, this] { writeSourceRange(D->getSourceRange()); });
103   attributeOnlyIfTrue("isImplicit", D->isImplicit());
104   attributeOnlyIfTrue("isInvalid", D->isInvalidDecl());
105 
106   if (D->isUsed())
107     JOS.attribute("isUsed", true);
108   else if (D->isThisDeclarationReferenced())
109     JOS.attribute("isReferenced", true);
110 
111   if (const auto *ND = dyn_cast<NamedDecl>(D))
112     attributeOnlyIfTrue("isHidden", ND->isHidden());
113 
114   if (D->getLexicalDeclContext() != D->getDeclContext()) {
115     // Because of multiple inheritance, a DeclContext pointer does not produce
116     // the same pointer representation as a Decl pointer that references the
117     // same AST Node.
118     const auto *ParentDeclContextDecl = dyn_cast<Decl>(D->getDeclContext());
119     JOS.attribute("parentDeclContextId",
120                   createPointerRepresentation(ParentDeclContextDecl));
121   }
122 
123   addPreviousDeclaration(D);
124   InnerDeclVisitor::Visit(D);
125 }
126 
127 void JSONNodeDumper::Visit(const comments::Comment *C,
128                            const comments::FullComment *FC) {
129   if (!C)
130     return;
131 
132   JOS.attribute("id", createPointerRepresentation(C));
133   JOS.attribute("kind", C->getCommentKindName());
134   JOS.attributeObject("loc",
135                       [C, this] { writeSourceLocation(C->getLocation()); });
136   JOS.attributeObject("range",
137                       [C, this] { writeSourceRange(C->getSourceRange()); });
138 
139   InnerCommentVisitor::visit(C, FC);
140 }
141 
142 void JSONNodeDumper::Visit(const TemplateArgument &TA, SourceRange R,
143                            const Decl *From, StringRef Label) {
144   JOS.attribute("kind", "TemplateArgument");
145   if (R.isValid())
146     JOS.attributeObject("range", [R, this] { writeSourceRange(R); });
147 
148   if (From)
149     JOS.attribute(Label.empty() ? "fromDecl" : Label, createBareDeclRef(From));
150 
151   InnerTemplateArgVisitor::Visit(TA);
152 }
153 
154 void JSONNodeDumper::Visit(const CXXCtorInitializer *Init) {
155   JOS.attribute("kind", "CXXCtorInitializer");
156   if (Init->isAnyMemberInitializer())
157     JOS.attribute("anyInit", createBareDeclRef(Init->getAnyMember()));
158   else if (Init->isBaseInitializer())
159     JOS.attribute("baseInit",
160                   createQualType(QualType(Init->getBaseClass(), 0)));
161   else if (Init->isDelegatingInitializer())
162     JOS.attribute("delegatingInit",
163                   createQualType(Init->getTypeSourceInfo()->getType()));
164   else
165     llvm_unreachable("Unknown initializer type");
166 }
167 
168 void JSONNodeDumper::Visit(const OMPClause *C) {}
169 
170 void JSONNodeDumper::Visit(const BlockDecl::Capture &C) {
171   JOS.attribute("kind", "Capture");
172   attributeOnlyIfTrue("byref", C.isByRef());
173   attributeOnlyIfTrue("nested", C.isNested());
174   if (C.getVariable())
175     JOS.attribute("var", createBareDeclRef(C.getVariable()));
176 }
177 
178 void JSONNodeDumper::Visit(const GenericSelectionExpr::ConstAssociation &A) {
179   JOS.attribute("associationKind", A.getTypeSourceInfo() ? "case" : "default");
180   attributeOnlyIfTrue("selected", A.isSelected());
181 }
182 
183 void JSONNodeDumper::writeIncludeStack(PresumedLoc Loc, bool JustFirst) {
184   if (Loc.isInvalid())
185     return;
186 
187   JOS.attributeBegin("includedFrom");
188   JOS.objectBegin();
189 
190   if (!JustFirst) {
191     // Walk the stack recursively, then print out the presumed location.
192     writeIncludeStack(SM.getPresumedLoc(Loc.getIncludeLoc()));
193   }
194 
195   JOS.attribute("file", Loc.getFilename());
196   JOS.objectEnd();
197   JOS.attributeEnd();
198 }
199 
200 void JSONNodeDumper::writeBareSourceLocation(SourceLocation Loc,
201                                              bool IsSpelling) {
202   PresumedLoc Presumed = SM.getPresumedLoc(Loc);
203   unsigned ActualLine = IsSpelling ? SM.getSpellingLineNumber(Loc)
204                                    : SM.getExpansionLineNumber(Loc);
205   if (Presumed.isValid()) {
206     JOS.attribute("offset", SM.getDecomposedLoc(Loc).second);
207     if (LastLocFilename != Presumed.getFilename()) {
208       JOS.attribute("file", Presumed.getFilename());
209       JOS.attribute("line", ActualLine);
210     } else if (LastLocLine != ActualLine)
211       JOS.attribute("line", ActualLine);
212 
213     unsigned PresumedLine = Presumed.getLine();
214     if (ActualLine != PresumedLine && LastLocPresumedLine != PresumedLine)
215       JOS.attribute("presumedLine", PresumedLine);
216 
217     JOS.attribute("col", Presumed.getColumn());
218     JOS.attribute("tokLen",
219                   Lexer::MeasureTokenLength(Loc, SM, Ctx.getLangOpts()));
220     LastLocFilename = Presumed.getFilename();
221     LastLocPresumedLine = PresumedLine;
222     LastLocLine = ActualLine;
223 
224     // Orthogonal to the file, line, and column de-duplication is whether the
225     // given location was a result of an include. If so, print where the
226     // include location came from.
227     writeIncludeStack(SM.getPresumedLoc(Presumed.getIncludeLoc()),
228                       /*JustFirst*/ true);
229   }
230 }
231 
232 void JSONNodeDumper::writeSourceLocation(SourceLocation Loc) {
233   SourceLocation Spelling = SM.getSpellingLoc(Loc);
234   SourceLocation Expansion = SM.getExpansionLoc(Loc);
235 
236   if (Expansion != Spelling) {
237     // If the expansion and the spelling are different, output subobjects
238     // describing both locations.
239     JOS.attributeObject("spellingLoc", [Spelling, this] {
240       writeBareSourceLocation(Spelling, /*IsSpelling*/ true);
241     });
242     JOS.attributeObject("expansionLoc", [Expansion, Loc, this] {
243       writeBareSourceLocation(Expansion, /*IsSpelling*/ false);
244       // If there is a macro expansion, add extra information if the interesting
245       // bit is the macro arg expansion.
246       if (SM.isMacroArgExpansion(Loc))
247         JOS.attribute("isMacroArgExpansion", true);
248     });
249   } else
250     writeBareSourceLocation(Spelling, /*IsSpelling*/ true);
251 }
252 
253 void JSONNodeDumper::writeSourceRange(SourceRange R) {
254   JOS.attributeObject("begin",
255                       [R, this] { writeSourceLocation(R.getBegin()); });
256   JOS.attributeObject("end", [R, this] { writeSourceLocation(R.getEnd()); });
257 }
258 
259 std::string JSONNodeDumper::createPointerRepresentation(const void *Ptr) {
260   // Because JSON stores integer values as signed 64-bit integers, trying to
261   // represent them as such makes for very ugly pointer values in the resulting
262   // output. Instead, we convert the value to hex and treat it as a string.
263   return "0x" + llvm::utohexstr(reinterpret_cast<uint64_t>(Ptr), true);
264 }
265 
266 llvm::json::Object JSONNodeDumper::createQualType(QualType QT, bool Desugar) {
267   SplitQualType SQT = QT.split();
268   llvm::json::Object Ret{{"qualType", QualType::getAsString(SQT, PrintPolicy)}};
269 
270   if (Desugar && !QT.isNull()) {
271     SplitQualType DSQT = QT.getSplitDesugaredType();
272     if (DSQT != SQT)
273       Ret["desugaredQualType"] = QualType::getAsString(DSQT, PrintPolicy);
274     if (const auto *TT = QT->getAs<TypedefType>())
275       Ret["typeAliasDeclId"] = createPointerRepresentation(TT->getDecl());
276   }
277   return Ret;
278 }
279 
280 void JSONNodeDumper::writeBareDeclRef(const Decl *D) {
281   JOS.attribute("id", createPointerRepresentation(D));
282   if (!D)
283     return;
284 
285   JOS.attribute("kind", (llvm::Twine(D->getDeclKindName()) + "Decl").str());
286   if (const auto *ND = dyn_cast<NamedDecl>(D))
287     JOS.attribute("name", ND->getDeclName().getAsString());
288   if (const auto *VD = dyn_cast<ValueDecl>(D))
289     JOS.attribute("type", createQualType(VD->getType()));
290 }
291 
292 llvm::json::Object JSONNodeDumper::createBareDeclRef(const Decl *D) {
293   llvm::json::Object Ret{{"id", createPointerRepresentation(D)}};
294   if (!D)
295     return Ret;
296 
297   Ret["kind"] = (llvm::Twine(D->getDeclKindName()) + "Decl").str();
298   if (const auto *ND = dyn_cast<NamedDecl>(D))
299     Ret["name"] = ND->getDeclName().getAsString();
300   if (const auto *VD = dyn_cast<ValueDecl>(D))
301     Ret["type"] = createQualType(VD->getType());
302   return Ret;
303 }
304 
305 llvm::json::Array JSONNodeDumper::createCastPath(const CastExpr *C) {
306   llvm::json::Array Ret;
307   if (C->path_empty())
308     return Ret;
309 
310   for (auto I = C->path_begin(), E = C->path_end(); I != E; ++I) {
311     const CXXBaseSpecifier *Base = *I;
312     const auto *RD =
313         cast<CXXRecordDecl>(Base->getType()->castAs<RecordType>()->getDecl());
314 
315     llvm::json::Object Val{{"name", RD->getName()}};
316     if (Base->isVirtual())
317       Val["isVirtual"] = true;
318     Ret.push_back(std::move(Val));
319   }
320   return Ret;
321 }
322 
323 #define FIELD2(Name, Flag)  if (RD->Flag()) Ret[Name] = true
324 #define FIELD1(Flag)        FIELD2(#Flag, Flag)
325 
326 static llvm::json::Object
327 createDefaultConstructorDefinitionData(const CXXRecordDecl *RD) {
328   llvm::json::Object Ret;
329 
330   FIELD2("exists", hasDefaultConstructor);
331   FIELD2("trivial", hasTrivialDefaultConstructor);
332   FIELD2("nonTrivial", hasNonTrivialDefaultConstructor);
333   FIELD2("userProvided", hasUserProvidedDefaultConstructor);
334   FIELD2("isConstexpr", hasConstexprDefaultConstructor);
335   FIELD2("needsImplicit", needsImplicitDefaultConstructor);
336   FIELD2("defaultedIsConstexpr", defaultedDefaultConstructorIsConstexpr);
337 
338   return Ret;
339 }
340 
341 static llvm::json::Object
342 createCopyConstructorDefinitionData(const CXXRecordDecl *RD) {
343   llvm::json::Object Ret;
344 
345   FIELD2("simple", hasSimpleCopyConstructor);
346   FIELD2("trivial", hasTrivialCopyConstructor);
347   FIELD2("nonTrivial", hasNonTrivialCopyConstructor);
348   FIELD2("userDeclared", hasUserDeclaredCopyConstructor);
349   FIELD2("hasConstParam", hasCopyConstructorWithConstParam);
350   FIELD2("implicitHasConstParam", implicitCopyConstructorHasConstParam);
351   FIELD2("needsImplicit", needsImplicitCopyConstructor);
352   FIELD2("needsOverloadResolution", needsOverloadResolutionForCopyConstructor);
353   if (!RD->needsOverloadResolutionForCopyConstructor())
354     FIELD2("defaultedIsDeleted", defaultedCopyConstructorIsDeleted);
355 
356   return Ret;
357 }
358 
359 static llvm::json::Object
360 createMoveConstructorDefinitionData(const CXXRecordDecl *RD) {
361   llvm::json::Object Ret;
362 
363   FIELD2("exists", hasMoveConstructor);
364   FIELD2("simple", hasSimpleMoveConstructor);
365   FIELD2("trivial", hasTrivialMoveConstructor);
366   FIELD2("nonTrivial", hasNonTrivialMoveConstructor);
367   FIELD2("userDeclared", hasUserDeclaredMoveConstructor);
368   FIELD2("needsImplicit", needsImplicitMoveConstructor);
369   FIELD2("needsOverloadResolution", needsOverloadResolutionForMoveConstructor);
370   if (!RD->needsOverloadResolutionForMoveConstructor())
371     FIELD2("defaultedIsDeleted", defaultedMoveConstructorIsDeleted);
372 
373   return Ret;
374 }
375 
376 static llvm::json::Object
377 createCopyAssignmentDefinitionData(const CXXRecordDecl *RD) {
378   llvm::json::Object Ret;
379 
380   FIELD2("trivial", hasTrivialCopyAssignment);
381   FIELD2("nonTrivial", hasNonTrivialCopyAssignment);
382   FIELD2("hasConstParam", hasCopyAssignmentWithConstParam);
383   FIELD2("implicitHasConstParam", implicitCopyAssignmentHasConstParam);
384   FIELD2("userDeclared", hasUserDeclaredCopyAssignment);
385   FIELD2("needsImplicit", needsImplicitCopyAssignment);
386   FIELD2("needsOverloadResolution", needsOverloadResolutionForCopyAssignment);
387 
388   return Ret;
389 }
390 
391 static llvm::json::Object
392 createMoveAssignmentDefinitionData(const CXXRecordDecl *RD) {
393   llvm::json::Object Ret;
394 
395   FIELD2("exists", hasMoveAssignment);
396   FIELD2("simple", hasSimpleMoveAssignment);
397   FIELD2("trivial", hasTrivialMoveAssignment);
398   FIELD2("nonTrivial", hasNonTrivialMoveAssignment);
399   FIELD2("userDeclared", hasUserDeclaredMoveAssignment);
400   FIELD2("needsImplicit", needsImplicitMoveAssignment);
401   FIELD2("needsOverloadResolution", needsOverloadResolutionForMoveAssignment);
402 
403   return Ret;
404 }
405 
406 static llvm::json::Object
407 createDestructorDefinitionData(const CXXRecordDecl *RD) {
408   llvm::json::Object Ret;
409 
410   FIELD2("simple", hasSimpleDestructor);
411   FIELD2("irrelevant", hasIrrelevantDestructor);
412   FIELD2("trivial", hasTrivialDestructor);
413   FIELD2("nonTrivial", hasNonTrivialDestructor);
414   FIELD2("userDeclared", hasUserDeclaredDestructor);
415   FIELD2("needsImplicit", needsImplicitDestructor);
416   FIELD2("needsOverloadResolution", needsOverloadResolutionForDestructor);
417   if (!RD->needsOverloadResolutionForDestructor())
418     FIELD2("defaultedIsDeleted", defaultedDestructorIsDeleted);
419 
420   return Ret;
421 }
422 
423 llvm::json::Object
424 JSONNodeDumper::createCXXRecordDefinitionData(const CXXRecordDecl *RD) {
425   llvm::json::Object Ret;
426 
427   // This data is common to all C++ classes.
428   FIELD1(isGenericLambda);
429   FIELD1(isLambda);
430   FIELD1(isEmpty);
431   FIELD1(isAggregate);
432   FIELD1(isStandardLayout);
433   FIELD1(isTriviallyCopyable);
434   FIELD1(isPOD);
435   FIELD1(isTrivial);
436   FIELD1(isPolymorphic);
437   FIELD1(isAbstract);
438   FIELD1(isLiteral);
439   FIELD1(canPassInRegisters);
440   FIELD1(hasUserDeclaredConstructor);
441   FIELD1(hasConstexprNonCopyMoveConstructor);
442   FIELD1(hasMutableFields);
443   FIELD1(hasVariantMembers);
444   FIELD2("canConstDefaultInit", allowConstDefaultInit);
445 
446   Ret["defaultCtor"] = createDefaultConstructorDefinitionData(RD);
447   Ret["copyCtor"] = createCopyConstructorDefinitionData(RD);
448   Ret["moveCtor"] = createMoveConstructorDefinitionData(RD);
449   Ret["copyAssign"] = createCopyAssignmentDefinitionData(RD);
450   Ret["moveAssign"] = createMoveAssignmentDefinitionData(RD);
451   Ret["dtor"] = createDestructorDefinitionData(RD);
452 
453   return Ret;
454 }
455 
456 #undef FIELD1
457 #undef FIELD2
458 
459 std::string JSONNodeDumper::createAccessSpecifier(AccessSpecifier AS) {
460   switch (AS) {
461   case AS_none: return "none";
462   case AS_private: return "private";
463   case AS_protected: return "protected";
464   case AS_public: return "public";
465   }
466   llvm_unreachable("Unknown access specifier");
467 }
468 
469 llvm::json::Object
470 JSONNodeDumper::createCXXBaseSpecifier(const CXXBaseSpecifier &BS) {
471   llvm::json::Object Ret;
472 
473   Ret["type"] = createQualType(BS.getType());
474   Ret["access"] = createAccessSpecifier(BS.getAccessSpecifier());
475   Ret["writtenAccess"] =
476       createAccessSpecifier(BS.getAccessSpecifierAsWritten());
477   if (BS.isVirtual())
478     Ret["isVirtual"] = true;
479   if (BS.isPackExpansion())
480     Ret["isPackExpansion"] = true;
481 
482   return Ret;
483 }
484 
485 void JSONNodeDumper::VisitTypedefType(const TypedefType *TT) {
486   JOS.attribute("decl", createBareDeclRef(TT->getDecl()));
487 }
488 
489 void JSONNodeDumper::VisitFunctionType(const FunctionType *T) {
490   FunctionType::ExtInfo E = T->getExtInfo();
491   attributeOnlyIfTrue("noreturn", E.getNoReturn());
492   attributeOnlyIfTrue("producesResult", E.getProducesResult());
493   if (E.getHasRegParm())
494     JOS.attribute("regParm", E.getRegParm());
495   JOS.attribute("cc", FunctionType::getNameForCallConv(E.getCC()));
496 }
497 
498 void JSONNodeDumper::VisitFunctionProtoType(const FunctionProtoType *T) {
499   FunctionProtoType::ExtProtoInfo E = T->getExtProtoInfo();
500   attributeOnlyIfTrue("trailingReturn", E.HasTrailingReturn);
501   attributeOnlyIfTrue("const", T->isConst());
502   attributeOnlyIfTrue("volatile", T->isVolatile());
503   attributeOnlyIfTrue("restrict", T->isRestrict());
504   attributeOnlyIfTrue("variadic", E.Variadic);
505   switch (E.RefQualifier) {
506   case RQ_LValue: JOS.attribute("refQualifier", "&"); break;
507   case RQ_RValue: JOS.attribute("refQualifier", "&&"); break;
508   case RQ_None: break;
509   }
510   switch (E.ExceptionSpec.Type) {
511   case EST_DynamicNone:
512   case EST_Dynamic: {
513     JOS.attribute("exceptionSpec", "throw");
514     llvm::json::Array Types;
515     for (QualType QT : E.ExceptionSpec.Exceptions)
516       Types.push_back(createQualType(QT));
517     JOS.attribute("exceptionTypes", std::move(Types));
518   } break;
519   case EST_MSAny:
520     JOS.attribute("exceptionSpec", "throw");
521     JOS.attribute("throwsAny", true);
522     break;
523   case EST_BasicNoexcept:
524     JOS.attribute("exceptionSpec", "noexcept");
525     break;
526   case EST_NoexceptTrue:
527   case EST_NoexceptFalse:
528     JOS.attribute("exceptionSpec", "noexcept");
529     JOS.attribute("conditionEvaluatesTo",
530                 E.ExceptionSpec.Type == EST_NoexceptTrue);
531     //JOS.attributeWithCall("exceptionSpecExpr",
532     //                    [this, E]() { Visit(E.ExceptionSpec.NoexceptExpr); });
533     break;
534   case EST_NoThrow:
535     JOS.attribute("exceptionSpec", "nothrow");
536     break;
537   // FIXME: I cannot find a way to trigger these cases while dumping the AST. I
538   // suspect you can only run into them when executing an AST dump from within
539   // the debugger, which is not a use case we worry about for the JSON dumping
540   // feature.
541   case EST_DependentNoexcept:
542   case EST_Unevaluated:
543   case EST_Uninstantiated:
544   case EST_Unparsed:
545   case EST_None: break;
546   }
547   VisitFunctionType(T);
548 }
549 
550 void JSONNodeDumper::VisitRValueReferenceType(const ReferenceType *RT) {
551   attributeOnlyIfTrue("spelledAsLValue", RT->isSpelledAsLValue());
552 }
553 
554 void JSONNodeDumper::VisitArrayType(const ArrayType *AT) {
555   switch (AT->getSizeModifier()) {
556   case ArrayType::Star:
557     JOS.attribute("sizeModifier", "*");
558     break;
559   case ArrayType::Static:
560     JOS.attribute("sizeModifier", "static");
561     break;
562   case ArrayType::Normal:
563     break;
564   }
565 
566   std::string Str = AT->getIndexTypeQualifiers().getAsString();
567   if (!Str.empty())
568     JOS.attribute("indexTypeQualifiers", Str);
569 }
570 
571 void JSONNodeDumper::VisitConstantArrayType(const ConstantArrayType *CAT) {
572   // FIXME: this should use ZExt instead of SExt, but JSON doesn't allow a
573   // narrowing conversion to int64_t so it cannot be expressed.
574   JOS.attribute("size", CAT->getSize().getSExtValue());
575   VisitArrayType(CAT);
576 }
577 
578 void JSONNodeDumper::VisitDependentSizedExtVectorType(
579     const DependentSizedExtVectorType *VT) {
580   JOS.attributeObject(
581       "attrLoc", [VT, this] { writeSourceLocation(VT->getAttributeLoc()); });
582 }
583 
584 void JSONNodeDumper::VisitVectorType(const VectorType *VT) {
585   JOS.attribute("numElements", VT->getNumElements());
586   switch (VT->getVectorKind()) {
587   case VectorType::GenericVector:
588     break;
589   case VectorType::AltiVecVector:
590     JOS.attribute("vectorKind", "altivec");
591     break;
592   case VectorType::AltiVecPixel:
593     JOS.attribute("vectorKind", "altivec pixel");
594     break;
595   case VectorType::AltiVecBool:
596     JOS.attribute("vectorKind", "altivec bool");
597     break;
598   case VectorType::NeonVector:
599     JOS.attribute("vectorKind", "neon");
600     break;
601   case VectorType::NeonPolyVector:
602     JOS.attribute("vectorKind", "neon poly");
603     break;
604   }
605 }
606 
607 void JSONNodeDumper::VisitUnresolvedUsingType(const UnresolvedUsingType *UUT) {
608   JOS.attribute("decl", createBareDeclRef(UUT->getDecl()));
609 }
610 
611 void JSONNodeDumper::VisitUnaryTransformType(const UnaryTransformType *UTT) {
612   switch (UTT->getUTTKind()) {
613   case UnaryTransformType::EnumUnderlyingType:
614     JOS.attribute("transformKind", "underlying_type");
615     break;
616   }
617 }
618 
619 void JSONNodeDumper::VisitTagType(const TagType *TT) {
620   JOS.attribute("decl", createBareDeclRef(TT->getDecl()));
621 }
622 
623 void JSONNodeDumper::VisitTemplateTypeParmType(
624     const TemplateTypeParmType *TTPT) {
625   JOS.attribute("depth", TTPT->getDepth());
626   JOS.attribute("index", TTPT->getIndex());
627   attributeOnlyIfTrue("isPack", TTPT->isParameterPack());
628   JOS.attribute("decl", createBareDeclRef(TTPT->getDecl()));
629 }
630 
631 void JSONNodeDumper::VisitAutoType(const AutoType *AT) {
632   JOS.attribute("undeduced", !AT->isDeduced());
633   switch (AT->getKeyword()) {
634   case AutoTypeKeyword::Auto:
635     JOS.attribute("typeKeyword", "auto");
636     break;
637   case AutoTypeKeyword::DecltypeAuto:
638     JOS.attribute("typeKeyword", "decltype(auto)");
639     break;
640   case AutoTypeKeyword::GNUAutoType:
641     JOS.attribute("typeKeyword", "__auto_type");
642     break;
643   }
644 }
645 
646 void JSONNodeDumper::VisitTemplateSpecializationType(
647     const TemplateSpecializationType *TST) {
648   attributeOnlyIfTrue("isAlias", TST->isTypeAlias());
649 
650   std::string Str;
651   llvm::raw_string_ostream OS(Str);
652   TST->getTemplateName().print(OS, PrintPolicy);
653   JOS.attribute("templateName", OS.str());
654 }
655 
656 void JSONNodeDumper::VisitInjectedClassNameType(
657     const InjectedClassNameType *ICNT) {
658   JOS.attribute("decl", createBareDeclRef(ICNT->getDecl()));
659 }
660 
661 void JSONNodeDumper::VisitObjCInterfaceType(const ObjCInterfaceType *OIT) {
662   JOS.attribute("decl", createBareDeclRef(OIT->getDecl()));
663 }
664 
665 void JSONNodeDumper::VisitPackExpansionType(const PackExpansionType *PET) {
666   if (llvm::Optional<unsigned> N = PET->getNumExpansions())
667     JOS.attribute("numExpansions", *N);
668 }
669 
670 void JSONNodeDumper::VisitElaboratedType(const ElaboratedType *ET) {
671   if (const NestedNameSpecifier *NNS = ET->getQualifier()) {
672     std::string Str;
673     llvm::raw_string_ostream OS(Str);
674     NNS->print(OS, PrintPolicy, /*ResolveTemplateArgs*/ true);
675     JOS.attribute("qualifier", OS.str());
676   }
677   if (const TagDecl *TD = ET->getOwnedTagDecl())
678     JOS.attribute("ownedTagDecl", createBareDeclRef(TD));
679 }
680 
681 void JSONNodeDumper::VisitMacroQualifiedType(const MacroQualifiedType *MQT) {
682   JOS.attribute("macroName", MQT->getMacroIdentifier()->getName());
683 }
684 
685 void JSONNodeDumper::VisitMemberPointerType(const MemberPointerType *MPT) {
686   attributeOnlyIfTrue("isData", MPT->isMemberDataPointer());
687   attributeOnlyIfTrue("isFunction", MPT->isMemberFunctionPointer());
688 }
689 
690 void JSONNodeDumper::VisitNamedDecl(const NamedDecl *ND) {
691   if (ND && ND->getDeclName())
692     JOS.attribute("name", ND->getNameAsString());
693 }
694 
695 void JSONNodeDumper::VisitTypedefDecl(const TypedefDecl *TD) {
696   VisitNamedDecl(TD);
697   JOS.attribute("type", createQualType(TD->getUnderlyingType()));
698 }
699 
700 void JSONNodeDumper::VisitTypeAliasDecl(const TypeAliasDecl *TAD) {
701   VisitNamedDecl(TAD);
702   JOS.attribute("type", createQualType(TAD->getUnderlyingType()));
703 }
704 
705 void JSONNodeDumper::VisitNamespaceDecl(const NamespaceDecl *ND) {
706   VisitNamedDecl(ND);
707   attributeOnlyIfTrue("isInline", ND->isInline());
708   if (!ND->isOriginalNamespace())
709     JOS.attribute("originalNamespace",
710                   createBareDeclRef(ND->getOriginalNamespace()));
711 }
712 
713 void JSONNodeDumper::VisitUsingDirectiveDecl(const UsingDirectiveDecl *UDD) {
714   JOS.attribute("nominatedNamespace",
715                 createBareDeclRef(UDD->getNominatedNamespace()));
716 }
717 
718 void JSONNodeDumper::VisitNamespaceAliasDecl(const NamespaceAliasDecl *NAD) {
719   VisitNamedDecl(NAD);
720   JOS.attribute("aliasedNamespace",
721                 createBareDeclRef(NAD->getAliasedNamespace()));
722 }
723 
724 void JSONNodeDumper::VisitUsingDecl(const UsingDecl *UD) {
725   std::string Name;
726   if (const NestedNameSpecifier *NNS = UD->getQualifier()) {
727     llvm::raw_string_ostream SOS(Name);
728     NNS->print(SOS, UD->getASTContext().getPrintingPolicy());
729   }
730   Name += UD->getNameAsString();
731   JOS.attribute("name", Name);
732 }
733 
734 void JSONNodeDumper::VisitUsingShadowDecl(const UsingShadowDecl *USD) {
735   JOS.attribute("target", createBareDeclRef(USD->getTargetDecl()));
736 }
737 
738 void JSONNodeDumper::VisitVarDecl(const VarDecl *VD) {
739   VisitNamedDecl(VD);
740   JOS.attribute("type", createQualType(VD->getType()));
741 
742   StorageClass SC = VD->getStorageClass();
743   if (SC != SC_None)
744     JOS.attribute("storageClass", VarDecl::getStorageClassSpecifierString(SC));
745   switch (VD->getTLSKind()) {
746   case VarDecl::TLS_Dynamic: JOS.attribute("tls", "dynamic"); break;
747   case VarDecl::TLS_Static: JOS.attribute("tls", "static"); break;
748   case VarDecl::TLS_None: break;
749   }
750   attributeOnlyIfTrue("nrvo", VD->isNRVOVariable());
751   attributeOnlyIfTrue("inline", VD->isInline());
752   attributeOnlyIfTrue("constexpr", VD->isConstexpr());
753   attributeOnlyIfTrue("modulePrivate", VD->isModulePrivate());
754   if (VD->hasInit()) {
755     switch (VD->getInitStyle()) {
756     case VarDecl::CInit: JOS.attribute("init", "c");  break;
757     case VarDecl::CallInit: JOS.attribute("init", "call"); break;
758     case VarDecl::ListInit: JOS.attribute("init", "list"); break;
759     }
760   }
761   attributeOnlyIfTrue("isParameterPack", VD->isParameterPack());
762 }
763 
764 void JSONNodeDumper::VisitFieldDecl(const FieldDecl *FD) {
765   VisitNamedDecl(FD);
766   JOS.attribute("type", createQualType(FD->getType()));
767   attributeOnlyIfTrue("mutable", FD->isMutable());
768   attributeOnlyIfTrue("modulePrivate", FD->isModulePrivate());
769   attributeOnlyIfTrue("isBitfield", FD->isBitField());
770   attributeOnlyIfTrue("hasInClassInitializer", FD->hasInClassInitializer());
771 }
772 
773 void JSONNodeDumper::VisitFunctionDecl(const FunctionDecl *FD) {
774   VisitNamedDecl(FD);
775   JOS.attribute("type", createQualType(FD->getType()));
776   StorageClass SC = FD->getStorageClass();
777   if (SC != SC_None)
778     JOS.attribute("storageClass", VarDecl::getStorageClassSpecifierString(SC));
779   attributeOnlyIfTrue("inline", FD->isInlineSpecified());
780   attributeOnlyIfTrue("virtual", FD->isVirtualAsWritten());
781   attributeOnlyIfTrue("pure", FD->isPure());
782   attributeOnlyIfTrue("explicitlyDeleted", FD->isDeletedAsWritten());
783   attributeOnlyIfTrue("constexpr", FD->isConstexpr());
784   attributeOnlyIfTrue("variadic", FD->isVariadic());
785 
786   if (FD->isDefaulted())
787     JOS.attribute("explicitlyDefaulted",
788                   FD->isDeleted() ? "deleted" : "default");
789 }
790 
791 void JSONNodeDumper::VisitEnumDecl(const EnumDecl *ED) {
792   VisitNamedDecl(ED);
793   if (ED->isFixed())
794     JOS.attribute("fixedUnderlyingType", createQualType(ED->getIntegerType()));
795   if (ED->isScoped())
796     JOS.attribute("scopedEnumTag",
797                   ED->isScopedUsingClassTag() ? "class" : "struct");
798 }
799 void JSONNodeDumper::VisitEnumConstantDecl(const EnumConstantDecl *ECD) {
800   VisitNamedDecl(ECD);
801   JOS.attribute("type", createQualType(ECD->getType()));
802 }
803 
804 void JSONNodeDumper::VisitRecordDecl(const RecordDecl *RD) {
805   VisitNamedDecl(RD);
806   JOS.attribute("tagUsed", RD->getKindName());
807   attributeOnlyIfTrue("completeDefinition", RD->isCompleteDefinition());
808 }
809 void JSONNodeDumper::VisitCXXRecordDecl(const CXXRecordDecl *RD) {
810   VisitRecordDecl(RD);
811 
812   // All other information requires a complete definition.
813   if (!RD->isCompleteDefinition())
814     return;
815 
816   JOS.attribute("definitionData", createCXXRecordDefinitionData(RD));
817   if (RD->getNumBases()) {
818     JOS.attributeArray("bases", [this, RD] {
819       for (const auto &Spec : RD->bases())
820         JOS.value(createCXXBaseSpecifier(Spec));
821     });
822   }
823 }
824 
825 void JSONNodeDumper::VisitTemplateTypeParmDecl(const TemplateTypeParmDecl *D) {
826   VisitNamedDecl(D);
827   JOS.attribute("tagUsed", D->wasDeclaredWithTypename() ? "typename" : "class");
828   JOS.attribute("depth", D->getDepth());
829   JOS.attribute("index", D->getIndex());
830   attributeOnlyIfTrue("isParameterPack", D->isParameterPack());
831 
832   if (D->hasDefaultArgument())
833     JOS.attributeObject("defaultArg", [=] {
834       Visit(D->getDefaultArgument(), SourceRange(),
835             D->getDefaultArgStorage().getInheritedFrom(),
836             D->defaultArgumentWasInherited() ? "inherited from" : "previous");
837     });
838 }
839 
840 void JSONNodeDumper::VisitNonTypeTemplateParmDecl(
841     const NonTypeTemplateParmDecl *D) {
842   VisitNamedDecl(D);
843   JOS.attribute("type", createQualType(D->getType()));
844   JOS.attribute("depth", D->getDepth());
845   JOS.attribute("index", D->getIndex());
846   attributeOnlyIfTrue("isParameterPack", D->isParameterPack());
847 
848   if (D->hasDefaultArgument())
849     JOS.attributeObject("defaultArg", [=] {
850       Visit(D->getDefaultArgument(), SourceRange(),
851             D->getDefaultArgStorage().getInheritedFrom(),
852             D->defaultArgumentWasInherited() ? "inherited from" : "previous");
853     });
854 }
855 
856 void JSONNodeDumper::VisitTemplateTemplateParmDecl(
857     const TemplateTemplateParmDecl *D) {
858   VisitNamedDecl(D);
859   JOS.attribute("depth", D->getDepth());
860   JOS.attribute("index", D->getIndex());
861   attributeOnlyIfTrue("isParameterPack", D->isParameterPack());
862 
863   if (D->hasDefaultArgument())
864     JOS.attributeObject("defaultArg", [=] {
865       Visit(D->getDefaultArgument().getArgument(),
866             D->getDefaultArgStorage().getInheritedFrom()->getSourceRange(),
867             D->getDefaultArgStorage().getInheritedFrom(),
868             D->defaultArgumentWasInherited() ? "inherited from" : "previous");
869     });
870 }
871 
872 void JSONNodeDumper::VisitLinkageSpecDecl(const LinkageSpecDecl *LSD) {
873   StringRef Lang;
874   switch (LSD->getLanguage()) {
875   case LinkageSpecDecl::lang_c: Lang = "C"; break;
876   case LinkageSpecDecl::lang_cxx: Lang = "C++"; break;
877   case LinkageSpecDecl::lang_cxx_11:
878     Lang = "C++11";
879     break;
880   case LinkageSpecDecl::lang_cxx_14:
881     Lang = "C++14";
882     break;
883   }
884   JOS.attribute("language", Lang);
885   attributeOnlyIfTrue("hasBraces", LSD->hasBraces());
886 }
887 
888 void JSONNodeDumper::VisitAccessSpecDecl(const AccessSpecDecl *ASD) {
889   JOS.attribute("access", createAccessSpecifier(ASD->getAccess()));
890 }
891 
892 void JSONNodeDumper::VisitFriendDecl(const FriendDecl *FD) {
893   if (const TypeSourceInfo *T = FD->getFriendType())
894     JOS.attribute("type", createQualType(T->getType()));
895 }
896 
897 void JSONNodeDumper::VisitObjCIvarDecl(const ObjCIvarDecl *D) {
898   VisitNamedDecl(D);
899   JOS.attribute("type", createQualType(D->getType()));
900   attributeOnlyIfTrue("synthesized", D->getSynthesize());
901   switch (D->getAccessControl()) {
902   case ObjCIvarDecl::None: JOS.attribute("access", "none"); break;
903   case ObjCIvarDecl::Private: JOS.attribute("access", "private"); break;
904   case ObjCIvarDecl::Protected: JOS.attribute("access", "protected"); break;
905   case ObjCIvarDecl::Public: JOS.attribute("access", "public"); break;
906   case ObjCIvarDecl::Package: JOS.attribute("access", "package"); break;
907   }
908 }
909 
910 void JSONNodeDumper::VisitObjCMethodDecl(const ObjCMethodDecl *D) {
911   VisitNamedDecl(D);
912   JOS.attribute("returnType", createQualType(D->getReturnType()));
913   JOS.attribute("instance", D->isInstanceMethod());
914   attributeOnlyIfTrue("variadic", D->isVariadic());
915 }
916 
917 void JSONNodeDumper::VisitObjCTypeParamDecl(const ObjCTypeParamDecl *D) {
918   VisitNamedDecl(D);
919   JOS.attribute("type", createQualType(D->getUnderlyingType()));
920   attributeOnlyIfTrue("bounded", D->hasExplicitBound());
921   switch (D->getVariance()) {
922   case ObjCTypeParamVariance::Invariant:
923     break;
924   case ObjCTypeParamVariance::Covariant:
925     JOS.attribute("variance", "covariant");
926     break;
927   case ObjCTypeParamVariance::Contravariant:
928     JOS.attribute("variance", "contravariant");
929     break;
930   }
931 }
932 
933 void JSONNodeDumper::VisitObjCCategoryDecl(const ObjCCategoryDecl *D) {
934   VisitNamedDecl(D);
935   JOS.attribute("interface", createBareDeclRef(D->getClassInterface()));
936   JOS.attribute("implementation", createBareDeclRef(D->getImplementation()));
937 
938   llvm::json::Array Protocols;
939   for (const auto* P : D->protocols())
940     Protocols.push_back(createBareDeclRef(P));
941   if (!Protocols.empty())
942     JOS.attribute("protocols", std::move(Protocols));
943 }
944 
945 void JSONNodeDumper::VisitObjCCategoryImplDecl(const ObjCCategoryImplDecl *D) {
946   VisitNamedDecl(D);
947   JOS.attribute("interface", createBareDeclRef(D->getClassInterface()));
948   JOS.attribute("categoryDecl", createBareDeclRef(D->getCategoryDecl()));
949 }
950 
951 void JSONNodeDumper::VisitObjCProtocolDecl(const ObjCProtocolDecl *D) {
952   VisitNamedDecl(D);
953 
954   llvm::json::Array Protocols;
955   for (const auto *P : D->protocols())
956     Protocols.push_back(createBareDeclRef(P));
957   if (!Protocols.empty())
958     JOS.attribute("protocols", std::move(Protocols));
959 }
960 
961 void JSONNodeDumper::VisitObjCInterfaceDecl(const ObjCInterfaceDecl *D) {
962   VisitNamedDecl(D);
963   JOS.attribute("super", createBareDeclRef(D->getSuperClass()));
964   JOS.attribute("implementation", createBareDeclRef(D->getImplementation()));
965 
966   llvm::json::Array Protocols;
967   for (const auto* P : D->protocols())
968     Protocols.push_back(createBareDeclRef(P));
969   if (!Protocols.empty())
970     JOS.attribute("protocols", std::move(Protocols));
971 }
972 
973 void JSONNodeDumper::VisitObjCImplementationDecl(
974     const ObjCImplementationDecl *D) {
975   VisitNamedDecl(D);
976   JOS.attribute("super", createBareDeclRef(D->getSuperClass()));
977   JOS.attribute("interface", createBareDeclRef(D->getClassInterface()));
978 }
979 
980 void JSONNodeDumper::VisitObjCCompatibleAliasDecl(
981     const ObjCCompatibleAliasDecl *D) {
982   VisitNamedDecl(D);
983   JOS.attribute("interface", createBareDeclRef(D->getClassInterface()));
984 }
985 
986 void JSONNodeDumper::VisitObjCPropertyDecl(const ObjCPropertyDecl *D) {
987   VisitNamedDecl(D);
988   JOS.attribute("type", createQualType(D->getType()));
989 
990   switch (D->getPropertyImplementation()) {
991   case ObjCPropertyDecl::None: break;
992   case ObjCPropertyDecl::Required: JOS.attribute("control", "required"); break;
993   case ObjCPropertyDecl::Optional: JOS.attribute("control", "optional"); break;
994   }
995 
996   ObjCPropertyDecl::PropertyAttributeKind Attrs = D->getPropertyAttributes();
997   if (Attrs != ObjCPropertyDecl::OBJC_PR_noattr) {
998     if (Attrs & ObjCPropertyDecl::OBJC_PR_getter)
999       JOS.attribute("getter", createBareDeclRef(D->getGetterMethodDecl()));
1000     if (Attrs & ObjCPropertyDecl::OBJC_PR_setter)
1001       JOS.attribute("setter", createBareDeclRef(D->getSetterMethodDecl()));
1002     attributeOnlyIfTrue("readonly", Attrs & ObjCPropertyDecl::OBJC_PR_readonly);
1003     attributeOnlyIfTrue("assign", Attrs & ObjCPropertyDecl::OBJC_PR_assign);
1004     attributeOnlyIfTrue("readwrite",
1005                         Attrs & ObjCPropertyDecl::OBJC_PR_readwrite);
1006     attributeOnlyIfTrue("retain", Attrs & ObjCPropertyDecl::OBJC_PR_retain);
1007     attributeOnlyIfTrue("copy", Attrs & ObjCPropertyDecl::OBJC_PR_copy);
1008     attributeOnlyIfTrue("nonatomic",
1009                         Attrs & ObjCPropertyDecl::OBJC_PR_nonatomic);
1010     attributeOnlyIfTrue("atomic", Attrs & ObjCPropertyDecl::OBJC_PR_atomic);
1011     attributeOnlyIfTrue("weak", Attrs & ObjCPropertyDecl::OBJC_PR_weak);
1012     attributeOnlyIfTrue("strong", Attrs & ObjCPropertyDecl::OBJC_PR_strong);
1013     attributeOnlyIfTrue("unsafe_unretained",
1014                         Attrs & ObjCPropertyDecl::OBJC_PR_unsafe_unretained);
1015     attributeOnlyIfTrue("class", Attrs & ObjCPropertyDecl::OBJC_PR_class);
1016     attributeOnlyIfTrue("nullability",
1017                         Attrs & ObjCPropertyDecl::OBJC_PR_nullability);
1018     attributeOnlyIfTrue("null_resettable",
1019                         Attrs & ObjCPropertyDecl::OBJC_PR_null_resettable);
1020   }
1021 }
1022 
1023 void JSONNodeDumper::VisitObjCPropertyImplDecl(const ObjCPropertyImplDecl *D) {
1024   VisitNamedDecl(D->getPropertyDecl());
1025   JOS.attribute("implKind", D->getPropertyImplementation() ==
1026                                     ObjCPropertyImplDecl::Synthesize
1027                                 ? "synthesize"
1028                                 : "dynamic");
1029   JOS.attribute("propertyDecl", createBareDeclRef(D->getPropertyDecl()));
1030   JOS.attribute("ivarDecl", createBareDeclRef(D->getPropertyIvarDecl()));
1031 }
1032 
1033 void JSONNodeDumper::VisitBlockDecl(const BlockDecl *D) {
1034   attributeOnlyIfTrue("variadic", D->isVariadic());
1035   attributeOnlyIfTrue("capturesThis", D->capturesCXXThis());
1036 }
1037 
1038 void JSONNodeDumper::VisitObjCEncodeExpr(const ObjCEncodeExpr *OEE) {
1039   JOS.attribute("encodedType", createQualType(OEE->getEncodedType()));
1040 }
1041 
1042 void JSONNodeDumper::VisitObjCMessageExpr(const ObjCMessageExpr *OME) {
1043   std::string Str;
1044   llvm::raw_string_ostream OS(Str);
1045 
1046   OME->getSelector().print(OS);
1047   JOS.attribute("selector", OS.str());
1048 
1049   switch (OME->getReceiverKind()) {
1050   case ObjCMessageExpr::Instance:
1051     JOS.attribute("receiverKind", "instance");
1052     break;
1053   case ObjCMessageExpr::Class:
1054     JOS.attribute("receiverKind", "class");
1055     JOS.attribute("classType", createQualType(OME->getClassReceiver()));
1056     break;
1057   case ObjCMessageExpr::SuperInstance:
1058     JOS.attribute("receiverKind", "super (instance)");
1059     JOS.attribute("superType", createQualType(OME->getSuperType()));
1060     break;
1061   case ObjCMessageExpr::SuperClass:
1062     JOS.attribute("receiverKind", "super (class)");
1063     JOS.attribute("superType", createQualType(OME->getSuperType()));
1064     break;
1065   }
1066 
1067   QualType CallReturnTy = OME->getCallReturnType(Ctx);
1068   if (OME->getType() != CallReturnTy)
1069     JOS.attribute("callReturnType", createQualType(CallReturnTy));
1070 }
1071 
1072 void JSONNodeDumper::VisitObjCBoxedExpr(const ObjCBoxedExpr *OBE) {
1073   if (const ObjCMethodDecl *MD = OBE->getBoxingMethod()) {
1074     std::string Str;
1075     llvm::raw_string_ostream OS(Str);
1076 
1077     MD->getSelector().print(OS);
1078     JOS.attribute("selector", OS.str());
1079   }
1080 }
1081 
1082 void JSONNodeDumper::VisitObjCSelectorExpr(const ObjCSelectorExpr *OSE) {
1083   std::string Str;
1084   llvm::raw_string_ostream OS(Str);
1085 
1086   OSE->getSelector().print(OS);
1087   JOS.attribute("selector", OS.str());
1088 }
1089 
1090 void JSONNodeDumper::VisitObjCProtocolExpr(const ObjCProtocolExpr *OPE) {
1091   JOS.attribute("protocol", createBareDeclRef(OPE->getProtocol()));
1092 }
1093 
1094 void JSONNodeDumper::VisitObjCPropertyRefExpr(const ObjCPropertyRefExpr *OPRE) {
1095   if (OPRE->isImplicitProperty()) {
1096     JOS.attribute("propertyKind", "implicit");
1097     if (const ObjCMethodDecl *MD = OPRE->getImplicitPropertyGetter())
1098       JOS.attribute("getter", createBareDeclRef(MD));
1099     if (const ObjCMethodDecl *MD = OPRE->getImplicitPropertySetter())
1100       JOS.attribute("setter", createBareDeclRef(MD));
1101   } else {
1102     JOS.attribute("propertyKind", "explicit");
1103     JOS.attribute("property", createBareDeclRef(OPRE->getExplicitProperty()));
1104   }
1105 
1106   attributeOnlyIfTrue("isSuperReceiver", OPRE->isSuperReceiver());
1107   attributeOnlyIfTrue("isMessagingGetter", OPRE->isMessagingGetter());
1108   attributeOnlyIfTrue("isMessagingSetter", OPRE->isMessagingSetter());
1109 }
1110 
1111 void JSONNodeDumper::VisitObjCSubscriptRefExpr(
1112     const ObjCSubscriptRefExpr *OSRE) {
1113   JOS.attribute("subscriptKind",
1114                 OSRE->isArraySubscriptRefExpr() ? "array" : "dictionary");
1115 
1116   if (const ObjCMethodDecl *MD = OSRE->getAtIndexMethodDecl())
1117     JOS.attribute("getter", createBareDeclRef(MD));
1118   if (const ObjCMethodDecl *MD = OSRE->setAtIndexMethodDecl())
1119     JOS.attribute("setter", createBareDeclRef(MD));
1120 }
1121 
1122 void JSONNodeDumper::VisitObjCIvarRefExpr(const ObjCIvarRefExpr *OIRE) {
1123   JOS.attribute("decl", createBareDeclRef(OIRE->getDecl()));
1124   attributeOnlyIfTrue("isFreeIvar", OIRE->isFreeIvar());
1125   JOS.attribute("isArrow", OIRE->isArrow());
1126 }
1127 
1128 void JSONNodeDumper::VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *OBLE) {
1129   JOS.attribute("value", OBLE->getValue() ? "__objc_yes" : "__objc_no");
1130 }
1131 
1132 void JSONNodeDumper::VisitDeclRefExpr(const DeclRefExpr *DRE) {
1133   JOS.attribute("referencedDecl", createBareDeclRef(DRE->getDecl()));
1134   if (DRE->getDecl() != DRE->getFoundDecl())
1135     JOS.attribute("foundReferencedDecl",
1136                   createBareDeclRef(DRE->getFoundDecl()));
1137   switch (DRE->isNonOdrUse()) {
1138   case NOUR_None: break;
1139   case NOUR_Unevaluated: JOS.attribute("nonOdrUseReason", "unevaluated"); break;
1140   case NOUR_Constant: JOS.attribute("nonOdrUseReason", "constant"); break;
1141   case NOUR_Discarded: JOS.attribute("nonOdrUseReason", "discarded"); break;
1142   }
1143 }
1144 
1145 void JSONNodeDumper::VisitPredefinedExpr(const PredefinedExpr *PE) {
1146   JOS.attribute("name", PredefinedExpr::getIdentKindName(PE->getIdentKind()));
1147 }
1148 
1149 void JSONNodeDumper::VisitUnaryOperator(const UnaryOperator *UO) {
1150   JOS.attribute("isPostfix", UO->isPostfix());
1151   JOS.attribute("opcode", UnaryOperator::getOpcodeStr(UO->getOpcode()));
1152   if (!UO->canOverflow())
1153     JOS.attribute("canOverflow", false);
1154 }
1155 
1156 void JSONNodeDumper::VisitBinaryOperator(const BinaryOperator *BO) {
1157   JOS.attribute("opcode", BinaryOperator::getOpcodeStr(BO->getOpcode()));
1158 }
1159 
1160 void JSONNodeDumper::VisitCompoundAssignOperator(
1161     const CompoundAssignOperator *CAO) {
1162   VisitBinaryOperator(CAO);
1163   JOS.attribute("computeLHSType", createQualType(CAO->getComputationLHSType()));
1164   JOS.attribute("computeResultType",
1165                 createQualType(CAO->getComputationResultType()));
1166 }
1167 
1168 void JSONNodeDumper::VisitMemberExpr(const MemberExpr *ME) {
1169   // Note, we always write this Boolean field because the information it conveys
1170   // is critical to understanding the AST node.
1171   ValueDecl *VD = ME->getMemberDecl();
1172   JOS.attribute("name", VD && VD->getDeclName() ? VD->getNameAsString() : "");
1173   JOS.attribute("isArrow", ME->isArrow());
1174   JOS.attribute("referencedMemberDecl", createPointerRepresentation(VD));
1175   switch (ME->isNonOdrUse()) {
1176   case NOUR_None: break;
1177   case NOUR_Unevaluated: JOS.attribute("nonOdrUseReason", "unevaluated"); break;
1178   case NOUR_Constant: JOS.attribute("nonOdrUseReason", "constant"); break;
1179   case NOUR_Discarded: JOS.attribute("nonOdrUseReason", "discarded"); break;
1180   }
1181 }
1182 
1183 void JSONNodeDumper::VisitCXXNewExpr(const CXXNewExpr *NE) {
1184   attributeOnlyIfTrue("isGlobal", NE->isGlobalNew());
1185   attributeOnlyIfTrue("isArray", NE->isArray());
1186   attributeOnlyIfTrue("isPlacement", NE->getNumPlacementArgs() != 0);
1187   switch (NE->getInitializationStyle()) {
1188   case CXXNewExpr::NoInit: break;
1189   case CXXNewExpr::CallInit: JOS.attribute("initStyle", "call"); break;
1190   case CXXNewExpr::ListInit: JOS.attribute("initStyle", "list"); break;
1191   }
1192   if (const FunctionDecl *FD = NE->getOperatorNew())
1193     JOS.attribute("operatorNewDecl", createBareDeclRef(FD));
1194   if (const FunctionDecl *FD = NE->getOperatorDelete())
1195     JOS.attribute("operatorDeleteDecl", createBareDeclRef(FD));
1196 }
1197 void JSONNodeDumper::VisitCXXDeleteExpr(const CXXDeleteExpr *DE) {
1198   attributeOnlyIfTrue("isGlobal", DE->isGlobalDelete());
1199   attributeOnlyIfTrue("isArray", DE->isArrayForm());
1200   attributeOnlyIfTrue("isArrayAsWritten", DE->isArrayFormAsWritten());
1201   if (const FunctionDecl *FD = DE->getOperatorDelete())
1202     JOS.attribute("operatorDeleteDecl", createBareDeclRef(FD));
1203 }
1204 
1205 void JSONNodeDumper::VisitCXXThisExpr(const CXXThisExpr *TE) {
1206   attributeOnlyIfTrue("implicit", TE->isImplicit());
1207 }
1208 
1209 void JSONNodeDumper::VisitCastExpr(const CastExpr *CE) {
1210   JOS.attribute("castKind", CE->getCastKindName());
1211   llvm::json::Array Path = createCastPath(CE);
1212   if (!Path.empty())
1213     JOS.attribute("path", std::move(Path));
1214   // FIXME: This may not be useful information as it can be obtusely gleaned
1215   // from the inner[] array.
1216   if (const NamedDecl *ND = CE->getConversionFunction())
1217     JOS.attribute("conversionFunc", createBareDeclRef(ND));
1218 }
1219 
1220 void JSONNodeDumper::VisitImplicitCastExpr(const ImplicitCastExpr *ICE) {
1221   VisitCastExpr(ICE);
1222   attributeOnlyIfTrue("isPartOfExplicitCast", ICE->isPartOfExplicitCast());
1223 }
1224 
1225 void JSONNodeDumper::VisitCallExpr(const CallExpr *CE) {
1226   attributeOnlyIfTrue("adl", CE->usesADL());
1227 }
1228 
1229 void JSONNodeDumper::VisitUnaryExprOrTypeTraitExpr(
1230     const UnaryExprOrTypeTraitExpr *TTE) {
1231   switch (TTE->getKind()) {
1232   case UETT_SizeOf: JOS.attribute("name", "sizeof"); break;
1233   case UETT_AlignOf: JOS.attribute("name", "alignof"); break;
1234   case UETT_VecStep:  JOS.attribute("name", "vec_step"); break;
1235   case UETT_PreferredAlignOf:  JOS.attribute("name", "__alignof"); break;
1236   case UETT_OpenMPRequiredSimdAlign:
1237     JOS.attribute("name", "__builtin_omp_required_simd_align"); break;
1238   }
1239   if (TTE->isArgumentType())
1240     JOS.attribute("argType", createQualType(TTE->getArgumentType()));
1241 }
1242 
1243 void JSONNodeDumper::VisitSizeOfPackExpr(const SizeOfPackExpr *SOPE) {
1244   VisitNamedDecl(SOPE->getPack());
1245 }
1246 
1247 void JSONNodeDumper::VisitUnresolvedLookupExpr(
1248     const UnresolvedLookupExpr *ULE) {
1249   JOS.attribute("usesADL", ULE->requiresADL());
1250   JOS.attribute("name", ULE->getName().getAsString());
1251 
1252   JOS.attributeArray("lookups", [this, ULE] {
1253     for (const NamedDecl *D : ULE->decls())
1254       JOS.value(createBareDeclRef(D));
1255   });
1256 }
1257 
1258 void JSONNodeDumper::VisitAddrLabelExpr(const AddrLabelExpr *ALE) {
1259   JOS.attribute("name", ALE->getLabel()->getName());
1260   JOS.attribute("labelDeclId", createPointerRepresentation(ALE->getLabel()));
1261 }
1262 
1263 void JSONNodeDumper::VisitCXXTypeidExpr(const CXXTypeidExpr *CTE) {
1264   if (CTE->isTypeOperand()) {
1265     QualType Adjusted = CTE->getTypeOperand(Ctx);
1266     QualType Unadjusted = CTE->getTypeOperandSourceInfo()->getType();
1267     JOS.attribute("typeArg", createQualType(Unadjusted));
1268     if (Adjusted != Unadjusted)
1269       JOS.attribute("adjustedTypeArg", createQualType(Adjusted));
1270   }
1271 }
1272 
1273 void JSONNodeDumper::VisitConstantExpr(const ConstantExpr *CE) {
1274   if (CE->getResultAPValueKind() != APValue::None) {
1275     std::string Str;
1276     llvm::raw_string_ostream OS(Str);
1277     CE->getAPValueResult().printPretty(OS, Ctx, CE->getType());
1278     JOS.attribute("value", OS.str());
1279   }
1280 }
1281 
1282 void JSONNodeDumper::VisitInitListExpr(const InitListExpr *ILE) {
1283   if (const FieldDecl *FD = ILE->getInitializedFieldInUnion())
1284     JOS.attribute("field", createBareDeclRef(FD));
1285 }
1286 
1287 void JSONNodeDumper::VisitGenericSelectionExpr(
1288     const GenericSelectionExpr *GSE) {
1289   attributeOnlyIfTrue("resultDependent", GSE->isResultDependent());
1290 }
1291 
1292 void JSONNodeDumper::VisitCXXUnresolvedConstructExpr(
1293     const CXXUnresolvedConstructExpr *UCE) {
1294   if (UCE->getType() != UCE->getTypeAsWritten())
1295     JOS.attribute("typeAsWritten", createQualType(UCE->getTypeAsWritten()));
1296   attributeOnlyIfTrue("list", UCE->isListInitialization());
1297 }
1298 
1299 void JSONNodeDumper::VisitCXXConstructExpr(const CXXConstructExpr *CE) {
1300   CXXConstructorDecl *Ctor = CE->getConstructor();
1301   JOS.attribute("ctorType", createQualType(Ctor->getType()));
1302   attributeOnlyIfTrue("elidable", CE->isElidable());
1303   attributeOnlyIfTrue("list", CE->isListInitialization());
1304   attributeOnlyIfTrue("initializer_list", CE->isStdInitListInitialization());
1305   attributeOnlyIfTrue("zeroing", CE->requiresZeroInitialization());
1306   attributeOnlyIfTrue("hadMultipleCandidates", CE->hadMultipleCandidates());
1307 
1308   switch (CE->getConstructionKind()) {
1309   case CXXConstructExpr::CK_Complete:
1310     JOS.attribute("constructionKind", "complete");
1311     break;
1312   case CXXConstructExpr::CK_Delegating:
1313     JOS.attribute("constructionKind", "delegating");
1314     break;
1315   case CXXConstructExpr::CK_NonVirtualBase:
1316     JOS.attribute("constructionKind", "non-virtual base");
1317     break;
1318   case CXXConstructExpr::CK_VirtualBase:
1319     JOS.attribute("constructionKind", "virtual base");
1320     break;
1321   }
1322 }
1323 
1324 void JSONNodeDumper::VisitExprWithCleanups(const ExprWithCleanups *EWC) {
1325   attributeOnlyIfTrue("cleanupsHaveSideEffects",
1326                       EWC->cleanupsHaveSideEffects());
1327   if (EWC->getNumObjects()) {
1328     JOS.attributeArray("cleanups", [this, EWC] {
1329       for (const ExprWithCleanups::CleanupObject &CO : EWC->getObjects())
1330         JOS.value(createBareDeclRef(CO));
1331     });
1332   }
1333 }
1334 
1335 void JSONNodeDumper::VisitCXXBindTemporaryExpr(
1336     const CXXBindTemporaryExpr *BTE) {
1337   const CXXTemporary *Temp = BTE->getTemporary();
1338   JOS.attribute("temp", createPointerRepresentation(Temp));
1339   if (const CXXDestructorDecl *Dtor = Temp->getDestructor())
1340     JOS.attribute("dtor", createBareDeclRef(Dtor));
1341 }
1342 
1343 void JSONNodeDumper::VisitMaterializeTemporaryExpr(
1344     const MaterializeTemporaryExpr *MTE) {
1345   if (const ValueDecl *VD = MTE->getExtendingDecl())
1346     JOS.attribute("extendingDecl", createBareDeclRef(VD));
1347 
1348   switch (MTE->getStorageDuration()) {
1349   case SD_Automatic:
1350     JOS.attribute("storageDuration", "automatic");
1351     break;
1352   case SD_Dynamic:
1353     JOS.attribute("storageDuration", "dynamic");
1354     break;
1355   case SD_FullExpression:
1356     JOS.attribute("storageDuration", "full expression");
1357     break;
1358   case SD_Static:
1359     JOS.attribute("storageDuration", "static");
1360     break;
1361   case SD_Thread:
1362     JOS.attribute("storageDuration", "thread");
1363     break;
1364   }
1365 
1366   attributeOnlyIfTrue("boundToLValueRef", MTE->isBoundToLvalueReference());
1367 }
1368 
1369 void JSONNodeDumper::VisitCXXDependentScopeMemberExpr(
1370     const CXXDependentScopeMemberExpr *DSME) {
1371   JOS.attribute("isArrow", DSME->isArrow());
1372   JOS.attribute("member", DSME->getMember().getAsString());
1373   attributeOnlyIfTrue("hasTemplateKeyword", DSME->hasTemplateKeyword());
1374   attributeOnlyIfTrue("hasExplicitTemplateArgs",
1375                       DSME->hasExplicitTemplateArgs());
1376 
1377   if (DSME->getNumTemplateArgs()) {
1378     JOS.attributeArray("explicitTemplateArgs", [DSME, this] {
1379       for (const TemplateArgumentLoc &TAL : DSME->template_arguments())
1380         JOS.object(
1381             [&TAL, this] { Visit(TAL.getArgument(), TAL.getSourceRange()); });
1382     });
1383   }
1384 }
1385 
1386 void JSONNodeDumper::VisitIntegerLiteral(const IntegerLiteral *IL) {
1387   JOS.attribute("value",
1388                 IL->getValue().toString(
1389                     /*Radix=*/10, IL->getType()->isSignedIntegerType()));
1390 }
1391 void JSONNodeDumper::VisitCharacterLiteral(const CharacterLiteral *CL) {
1392   // FIXME: This should probably print the character literal as a string,
1393   // rather than as a numerical value. It would be nice if the behavior matched
1394   // what we do to print a string literal; right now, it is impossible to tell
1395   // the difference between 'a' and L'a' in C from the JSON output.
1396   JOS.attribute("value", CL->getValue());
1397 }
1398 void JSONNodeDumper::VisitFixedPointLiteral(const FixedPointLiteral *FPL) {
1399   JOS.attribute("value", FPL->getValueAsString(/*Radix=*/10));
1400 }
1401 void JSONNodeDumper::VisitFloatingLiteral(const FloatingLiteral *FL) {
1402   llvm::SmallVector<char, 16> Buffer;
1403   FL->getValue().toString(Buffer);
1404   JOS.attribute("value", Buffer);
1405 }
1406 void JSONNodeDumper::VisitStringLiteral(const StringLiteral *SL) {
1407   std::string Buffer;
1408   llvm::raw_string_ostream SS(Buffer);
1409   SL->outputString(SS);
1410   JOS.attribute("value", SS.str());
1411 }
1412 void JSONNodeDumper::VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *BLE) {
1413   JOS.attribute("value", BLE->getValue());
1414 }
1415 
1416 void JSONNodeDumper::VisitIfStmt(const IfStmt *IS) {
1417   attributeOnlyIfTrue("hasInit", IS->hasInitStorage());
1418   attributeOnlyIfTrue("hasVar", IS->hasVarStorage());
1419   attributeOnlyIfTrue("hasElse", IS->hasElseStorage());
1420   attributeOnlyIfTrue("isConstexpr", IS->isConstexpr());
1421 }
1422 
1423 void JSONNodeDumper::VisitSwitchStmt(const SwitchStmt *SS) {
1424   attributeOnlyIfTrue("hasInit", SS->hasInitStorage());
1425   attributeOnlyIfTrue("hasVar", SS->hasVarStorage());
1426 }
1427 void JSONNodeDumper::VisitCaseStmt(const CaseStmt *CS) {
1428   attributeOnlyIfTrue("isGNURange", CS->caseStmtIsGNURange());
1429 }
1430 
1431 void JSONNodeDumper::VisitLabelStmt(const LabelStmt *LS) {
1432   JOS.attribute("name", LS->getName());
1433   JOS.attribute("declId", createPointerRepresentation(LS->getDecl()));
1434 }
1435 void JSONNodeDumper::VisitGotoStmt(const GotoStmt *GS) {
1436   JOS.attribute("targetLabelDeclId",
1437                 createPointerRepresentation(GS->getLabel()));
1438 }
1439 
1440 void JSONNodeDumper::VisitWhileStmt(const WhileStmt *WS) {
1441   attributeOnlyIfTrue("hasVar", WS->hasVarStorage());
1442 }
1443 
1444 void JSONNodeDumper::VisitObjCAtCatchStmt(const ObjCAtCatchStmt* OACS) {
1445   // FIXME: it would be nice for the ASTNodeTraverser would handle the catch
1446   // parameter the same way for C++ and ObjC rather. In this case, C++ gets a
1447   // null child node and ObjC gets no child node.
1448   attributeOnlyIfTrue("isCatchAll", OACS->getCatchParamDecl() == nullptr);
1449 }
1450 
1451 void JSONNodeDumper::VisitNullTemplateArgument(const TemplateArgument &TA) {
1452   JOS.attribute("isNull", true);
1453 }
1454 void JSONNodeDumper::VisitTypeTemplateArgument(const TemplateArgument &TA) {
1455   JOS.attribute("type", createQualType(TA.getAsType()));
1456 }
1457 void JSONNodeDumper::VisitDeclarationTemplateArgument(
1458     const TemplateArgument &TA) {
1459   JOS.attribute("decl", createBareDeclRef(TA.getAsDecl()));
1460 }
1461 void JSONNodeDumper::VisitNullPtrTemplateArgument(const TemplateArgument &TA) {
1462   JOS.attribute("isNullptr", true);
1463 }
1464 void JSONNodeDumper::VisitIntegralTemplateArgument(const TemplateArgument &TA) {
1465   JOS.attribute("value", TA.getAsIntegral().getSExtValue());
1466 }
1467 void JSONNodeDumper::VisitTemplateTemplateArgument(const TemplateArgument &TA) {
1468   // FIXME: cannot just call dump() on the argument, as that doesn't specify
1469   // the output format.
1470 }
1471 void JSONNodeDumper::VisitTemplateExpansionTemplateArgument(
1472     const TemplateArgument &TA) {
1473   // FIXME: cannot just call dump() on the argument, as that doesn't specify
1474   // the output format.
1475 }
1476 void JSONNodeDumper::VisitExpressionTemplateArgument(
1477     const TemplateArgument &TA) {
1478   JOS.attribute("isExpr", true);
1479 }
1480 void JSONNodeDumper::VisitPackTemplateArgument(const TemplateArgument &TA) {
1481   JOS.attribute("isPack", true);
1482 }
1483 
1484 StringRef JSONNodeDumper::getCommentCommandName(unsigned CommandID) const {
1485   if (Traits)
1486     return Traits->getCommandInfo(CommandID)->Name;
1487   if (const comments::CommandInfo *Info =
1488           comments::CommandTraits::getBuiltinCommandInfo(CommandID))
1489     return Info->Name;
1490   return "<invalid>";
1491 }
1492 
1493 void JSONNodeDumper::visitTextComment(const comments::TextComment *C,
1494                                       const comments::FullComment *) {
1495   JOS.attribute("text", C->getText());
1496 }
1497 
1498 void JSONNodeDumper::visitInlineCommandComment(
1499     const comments::InlineCommandComment *C, const comments::FullComment *) {
1500   JOS.attribute("name", getCommentCommandName(C->getCommandID()));
1501 
1502   switch (C->getRenderKind()) {
1503   case comments::InlineCommandComment::RenderNormal:
1504     JOS.attribute("renderKind", "normal");
1505     break;
1506   case comments::InlineCommandComment::RenderBold:
1507     JOS.attribute("renderKind", "bold");
1508     break;
1509   case comments::InlineCommandComment::RenderEmphasized:
1510     JOS.attribute("renderKind", "emphasized");
1511     break;
1512   case comments::InlineCommandComment::RenderMonospaced:
1513     JOS.attribute("renderKind", "monospaced");
1514     break;
1515   }
1516 
1517   llvm::json::Array Args;
1518   for (unsigned I = 0, E = C->getNumArgs(); I < E; ++I)
1519     Args.push_back(C->getArgText(I));
1520 
1521   if (!Args.empty())
1522     JOS.attribute("args", std::move(Args));
1523 }
1524 
1525 void JSONNodeDumper::visitHTMLStartTagComment(
1526     const comments::HTMLStartTagComment *C, const comments::FullComment *) {
1527   JOS.attribute("name", C->getTagName());
1528   attributeOnlyIfTrue("selfClosing", C->isSelfClosing());
1529   attributeOnlyIfTrue("malformed", C->isMalformed());
1530 
1531   llvm::json::Array Attrs;
1532   for (unsigned I = 0, E = C->getNumAttrs(); I < E; ++I)
1533     Attrs.push_back(
1534         {{"name", C->getAttr(I).Name}, {"value", C->getAttr(I).Value}});
1535 
1536   if (!Attrs.empty())
1537     JOS.attribute("attrs", std::move(Attrs));
1538 }
1539 
1540 void JSONNodeDumper::visitHTMLEndTagComment(
1541     const comments::HTMLEndTagComment *C, const comments::FullComment *) {
1542   JOS.attribute("name", C->getTagName());
1543 }
1544 
1545 void JSONNodeDumper::visitBlockCommandComment(
1546     const comments::BlockCommandComment *C, const comments::FullComment *) {
1547   JOS.attribute("name", getCommentCommandName(C->getCommandID()));
1548 
1549   llvm::json::Array Args;
1550   for (unsigned I = 0, E = C->getNumArgs(); I < E; ++I)
1551     Args.push_back(C->getArgText(I));
1552 
1553   if (!Args.empty())
1554     JOS.attribute("args", std::move(Args));
1555 }
1556 
1557 void JSONNodeDumper::visitParamCommandComment(
1558     const comments::ParamCommandComment *C, const comments::FullComment *FC) {
1559   switch (C->getDirection()) {
1560   case comments::ParamCommandComment::In:
1561     JOS.attribute("direction", "in");
1562     break;
1563   case comments::ParamCommandComment::Out:
1564     JOS.attribute("direction", "out");
1565     break;
1566   case comments::ParamCommandComment::InOut:
1567     JOS.attribute("direction", "in,out");
1568     break;
1569   }
1570   attributeOnlyIfTrue("explicit", C->isDirectionExplicit());
1571 
1572   if (C->hasParamName())
1573     JOS.attribute("param", C->isParamIndexValid() ? C->getParamName(FC)
1574                                                   : C->getParamNameAsWritten());
1575 
1576   if (C->isParamIndexValid() && !C->isVarArgParam())
1577     JOS.attribute("paramIdx", C->getParamIndex());
1578 }
1579 
1580 void JSONNodeDumper::visitTParamCommandComment(
1581     const comments::TParamCommandComment *C, const comments::FullComment *FC) {
1582   if (C->hasParamName())
1583     JOS.attribute("param", C->isPositionValid() ? C->getParamName(FC)
1584                                                 : C->getParamNameAsWritten());
1585   if (C->isPositionValid()) {
1586     llvm::json::Array Positions;
1587     for (unsigned I = 0, E = C->getDepth(); I < E; ++I)
1588       Positions.push_back(C->getIndex(I));
1589 
1590     if (!Positions.empty())
1591       JOS.attribute("positions", std::move(Positions));
1592   }
1593 }
1594 
1595 void JSONNodeDumper::visitVerbatimBlockComment(
1596     const comments::VerbatimBlockComment *C, const comments::FullComment *) {
1597   JOS.attribute("name", getCommentCommandName(C->getCommandID()));
1598   JOS.attribute("closeName", C->getCloseName());
1599 }
1600 
1601 void JSONNodeDumper::visitVerbatimBlockLineComment(
1602     const comments::VerbatimBlockLineComment *C,
1603     const comments::FullComment *) {
1604   JOS.attribute("text", C->getText());
1605 }
1606 
1607 void JSONNodeDumper::visitVerbatimLineComment(
1608     const comments::VerbatimLineComment *C, const comments::FullComment *) {
1609   JOS.attribute("text", C->getText());
1610 }
1611