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