xref: /llvm-project/clang/lib/AST/JSONNodeDumper.cpp (revision e622468f164f6ba223e6862d8235eea5f555f927) 
1 #include "clang/AST/JSONNodeDumper.h"
2 #include "clang/AST/Type.h"
3 #include "clang/Basic/SourceManager.h"
4 #include "clang/Basic/Specifiers.h"
5 #include "clang/Lex/Lexer.h"
6 #include "llvm/ADT/StringExtras.h"
7 #include <optional>
8 
9 using namespace clang;
10 
11 void JSONNodeDumper::addPreviousDeclaration(const Decl *D) {
12   switch (D->getKind()) {
13 #define DECL(DERIVED, BASE)                                                    \
14   case Decl::DERIVED:                                                          \
15     return writePreviousDeclImpl(cast<DERIVED##Decl>(D));
16 #define ABSTRACT_DECL(DECL)
17 #include "clang/AST/DeclNodes.inc"
18 #undef ABSTRACT_DECL
19 #undef DECL
20   }
21   llvm_unreachable("Decl that isn't part of DeclNodes.inc!");
22 }
23 
24 void JSONNodeDumper::Visit(const Attr *A) {
25   const char *AttrName = nullptr;
26   switch (A->getKind()) {
27 #define ATTR(X)                                                                \
28   case attr::X:                                                                \
29     AttrName = #X"Attr";                                                       \
30     break;
31 #include "clang/Basic/AttrList.inc"
32 #undef ATTR
33   }
34   JOS.attribute("id", createPointerRepresentation(A));
35   JOS.attribute("kind", AttrName);
36   JOS.attributeObject("range", [A, this] { writeSourceRange(A->getRange()); });
37   attributeOnlyIfTrue("inherited", A->isInherited());
38   attributeOnlyIfTrue("implicit", A->isImplicit());
39 
40   // FIXME: it would be useful for us to output the spelling kind as well as
41   // the actual spelling. This would allow us to distinguish between the
42   // various attribute syntaxes, but we don't currently track that information
43   // within the AST.
44   //JOS.attribute("spelling", A->getSpelling());
45 
46   InnerAttrVisitor::Visit(A);
47 }
48 
49 void JSONNodeDumper::Visit(const Stmt *S) {
50   if (!S)
51     return;
52 
53   JOS.attribute("id", createPointerRepresentation(S));
54   JOS.attribute("kind", S->getStmtClassName());
55   JOS.attributeObject("range",
56                       [S, this] { writeSourceRange(S->getSourceRange()); });
57 
58   if (const auto *E = dyn_cast<Expr>(S)) {
59     JOS.attribute("type", createQualType(E->getType()));
60     const char *Category = nullptr;
61     switch (E->getValueKind()) {
62     case VK_LValue: Category = "lvalue"; break;
63     case VK_XValue: Category = "xvalue"; break;
64     case VK_PRValue:
65       Category = "prvalue";
66       break;
67     }
68     JOS.attribute("valueCategory", Category);
69   }
70   InnerStmtVisitor::Visit(S);
71 }
72 
73 void JSONNodeDumper::Visit(const Type *T) {
74   JOS.attribute("id", createPointerRepresentation(T));
75 
76   if (!T)
77     return;
78 
79   JOS.attribute("kind", (llvm::Twine(T->getTypeClassName()) + "Type").str());
80   JOS.attribute("type", createQualType(QualType(T, 0), /*Desugar=*/false));
81   attributeOnlyIfTrue("containsErrors", T->containsErrors());
82   attributeOnlyIfTrue("isDependent", T->isDependentType());
83   attributeOnlyIfTrue("isInstantiationDependent",
84                       T->isInstantiationDependentType());
85   attributeOnlyIfTrue("isVariablyModified", T->isVariablyModifiedType());
86   attributeOnlyIfTrue("containsUnexpandedPack",
87                       T->containsUnexpandedParameterPack());
88   attributeOnlyIfTrue("isImported", T->isFromAST());
89   InnerTypeVisitor::Visit(T);
90 }
91 
92 void JSONNodeDumper::Visit(QualType T) {
93   JOS.attribute("id", createPointerRepresentation(T.getAsOpaquePtr()));
94   JOS.attribute("kind", "QualType");
95   JOS.attribute("type", createQualType(T));
96   JOS.attribute("qualifiers", T.split().Quals.getAsString());
97 }
98 
99 void JSONNodeDumper::Visit(TypeLoc TL) {
100   if (TL.isNull())
101     return;
102   JOS.attribute("kind",
103                 (llvm::Twine(TL.getTypeLocClass() == TypeLoc::Qualified
104                                  ? "Qualified"
105                                  : TL.getTypePtr()->getTypeClassName()) +
106                  "TypeLoc")
107                     .str());
108   JOS.attribute("type",
109                 createQualType(QualType(TL.getType()), /*Desugar=*/false));
110   JOS.attributeObject("range",
111                       [TL, this] { writeSourceRange(TL.getSourceRange()); });
112 }
113 
114 void JSONNodeDumper::Visit(const Decl *D) {
115   JOS.attribute("id", createPointerRepresentation(D));
116 
117   if (!D)
118     return;
119 
120   JOS.attribute("kind", (llvm::Twine(D->getDeclKindName()) + "Decl").str());
121   JOS.attributeObject("loc",
122                       [D, this] { writeSourceLocation(D->getLocation()); });
123   JOS.attributeObject("range",
124                       [D, this] { writeSourceRange(D->getSourceRange()); });
125   attributeOnlyIfTrue("isImplicit", D->isImplicit());
126   attributeOnlyIfTrue("isInvalid", D->isInvalidDecl());
127 
128   if (D->isUsed())
129     JOS.attribute("isUsed", true);
130   else if (D->isThisDeclarationReferenced())
131     JOS.attribute("isReferenced", true);
132 
133   if (const auto *ND = dyn_cast<NamedDecl>(D))
134     attributeOnlyIfTrue("isHidden", !ND->isUnconditionallyVisible());
135 
136   if (D->getLexicalDeclContext() != D->getDeclContext()) {
137     // Because of multiple inheritance, a DeclContext pointer does not produce
138     // the same pointer representation as a Decl pointer that references the
139     // same AST Node.
140     const auto *ParentDeclContextDecl = dyn_cast<Decl>(D->getDeclContext());
141     JOS.attribute("parentDeclContextId",
142                   createPointerRepresentation(ParentDeclContextDecl));
143   }
144 
145   addPreviousDeclaration(D);
146   InnerDeclVisitor::Visit(D);
147 }
148 
149 void JSONNodeDumper::Visit(const comments::Comment *C,
150                            const comments::FullComment *FC) {
151   if (!C)
152     return;
153 
154   JOS.attribute("id", createPointerRepresentation(C));
155   JOS.attribute("kind", C->getCommentKindName());
156   JOS.attributeObject("loc",
157                       [C, this] { writeSourceLocation(C->getLocation()); });
158   JOS.attributeObject("range",
159                       [C, this] { writeSourceRange(C->getSourceRange()); });
160 
161   InnerCommentVisitor::visit(C, FC);
162 }
163 
164 void JSONNodeDumper::Visit(const TemplateArgument &TA, SourceRange R,
165                            const Decl *From, StringRef Label) {
166   JOS.attribute("kind", "TemplateArgument");
167   if (R.isValid())
168     JOS.attributeObject("range", [R, this] { writeSourceRange(R); });
169 
170   if (From)
171     JOS.attribute(Label.empty() ? "fromDecl" : Label, createBareDeclRef(From));
172 
173   InnerTemplateArgVisitor::Visit(TA);
174 }
175 
176 void JSONNodeDumper::Visit(const CXXCtorInitializer *Init) {
177   JOS.attribute("kind", "CXXCtorInitializer");
178   if (Init->isAnyMemberInitializer())
179     JOS.attribute("anyInit", createBareDeclRef(Init->getAnyMember()));
180   else if (Init->isBaseInitializer())
181     JOS.attribute("baseInit",
182                   createQualType(QualType(Init->getBaseClass(), 0)));
183   else if (Init->isDelegatingInitializer())
184     JOS.attribute("delegatingInit",
185                   createQualType(Init->getTypeSourceInfo()->getType()));
186   else
187     llvm_unreachable("Unknown initializer type");
188 }
189 
190 void JSONNodeDumper::Visit(const OpenACCClause *C) {}
191 
192 void JSONNodeDumper::Visit(const OMPClause *C) {}
193 
194 void JSONNodeDumper::Visit(const BlockDecl::Capture &C) {
195   JOS.attribute("kind", "Capture");
196   attributeOnlyIfTrue("byref", C.isByRef());
197   attributeOnlyIfTrue("nested", C.isNested());
198   if (C.getVariable())
199     JOS.attribute("var", createBareDeclRef(C.getVariable()));
200 }
201 
202 void JSONNodeDumper::Visit(const GenericSelectionExpr::ConstAssociation &A) {
203   JOS.attribute("associationKind", A.getTypeSourceInfo() ? "case" : "default");
204   attributeOnlyIfTrue("selected", A.isSelected());
205 }
206 
207 void JSONNodeDumper::Visit(const concepts::Requirement *R) {
208   if (!R)
209     return;
210 
211   switch (R->getKind()) {
212   case concepts::Requirement::RK_Type:
213     JOS.attribute("kind", "TypeRequirement");
214     break;
215   case concepts::Requirement::RK_Simple:
216     JOS.attribute("kind", "SimpleRequirement");
217     break;
218   case concepts::Requirement::RK_Compound:
219     JOS.attribute("kind", "CompoundRequirement");
220     break;
221   case concepts::Requirement::RK_Nested:
222     JOS.attribute("kind", "NestedRequirement");
223     break;
224   }
225 
226   if (auto *ER = dyn_cast<concepts::ExprRequirement>(R))
227     attributeOnlyIfTrue("noexcept", ER->hasNoexceptRequirement());
228 
229   attributeOnlyIfTrue("isDependent", R->isDependent());
230   if (!R->isDependent())
231     JOS.attribute("satisfied", R->isSatisfied());
232   attributeOnlyIfTrue("containsUnexpandedPack",
233                       R->containsUnexpandedParameterPack());
234 }
235 
236 void JSONNodeDumper::Visit(const APValue &Value, QualType Ty) {
237   std::string Str;
238   llvm::raw_string_ostream OS(Str);
239   Value.printPretty(OS, Ctx, Ty);
240   JOS.attribute("value", Str);
241 }
242 
243 void JSONNodeDumper::Visit(const ConceptReference *CR) {
244   JOS.attribute("kind", "ConceptReference");
245   JOS.attribute("id", createPointerRepresentation(CR->getNamedConcept()));
246   if (const auto *Args = CR->getTemplateArgsAsWritten()) {
247     JOS.attributeArray("templateArgsAsWritten", [Args, this] {
248       for (const TemplateArgumentLoc &TAL : Args->arguments())
249         JOS.object(
250             [&TAL, this] { Visit(TAL.getArgument(), TAL.getSourceRange()); });
251     });
252   }
253   JOS.attributeObject("loc",
254                       [CR, this] { writeSourceLocation(CR->getLocation()); });
255   JOS.attributeObject("range",
256                       [CR, this] { writeSourceRange(CR->getSourceRange()); });
257 }
258 
259 void JSONNodeDumper::writeIncludeStack(PresumedLoc Loc, bool JustFirst) {
260   if (Loc.isInvalid())
261     return;
262 
263   JOS.attributeBegin("includedFrom");
264   JOS.objectBegin();
265 
266   if (!JustFirst) {
267     // Walk the stack recursively, then print out the presumed location.
268     writeIncludeStack(SM.getPresumedLoc(Loc.getIncludeLoc()));
269   }
270 
271   JOS.attribute("file", Loc.getFilename());
272   JOS.objectEnd();
273   JOS.attributeEnd();
274 }
275 
276 void JSONNodeDumper::writeBareSourceLocation(SourceLocation Loc,
277                                              bool IsSpelling) {
278   PresumedLoc Presumed = SM.getPresumedLoc(Loc);
279   unsigned ActualLine = IsSpelling ? SM.getSpellingLineNumber(Loc)
280                                    : SM.getExpansionLineNumber(Loc);
281   StringRef ActualFile = SM.getBufferName(Loc);
282 
283   if (Presumed.isValid()) {
284     JOS.attribute("offset", SM.getDecomposedLoc(Loc).second);
285     if (LastLocFilename != ActualFile) {
286       JOS.attribute("file", ActualFile);
287       JOS.attribute("line", ActualLine);
288     } else if (LastLocLine != ActualLine)
289       JOS.attribute("line", ActualLine);
290 
291     StringRef PresumedFile = Presumed.getFilename();
292     if (PresumedFile != ActualFile && LastLocPresumedFilename != PresumedFile)
293       JOS.attribute("presumedFile", PresumedFile);
294 
295     unsigned PresumedLine = Presumed.getLine();
296     if (ActualLine != PresumedLine && LastLocPresumedLine != PresumedLine)
297       JOS.attribute("presumedLine", PresumedLine);
298 
299     JOS.attribute("col", Presumed.getColumn());
300     JOS.attribute("tokLen",
301                   Lexer::MeasureTokenLength(Loc, SM, Ctx.getLangOpts()));
302     LastLocFilename = ActualFile;
303     LastLocPresumedFilename = PresumedFile;
304     LastLocPresumedLine = PresumedLine;
305     LastLocLine = ActualLine;
306 
307     // Orthogonal to the file, line, and column de-duplication is whether the
308     // given location was a result of an include. If so, print where the
309     // include location came from.
310     writeIncludeStack(SM.getPresumedLoc(Presumed.getIncludeLoc()),
311                       /*JustFirst*/ true);
312   }
313 }
314 
315 void JSONNodeDumper::writeSourceLocation(SourceLocation Loc) {
316   SourceLocation Spelling = SM.getSpellingLoc(Loc);
317   SourceLocation Expansion = SM.getExpansionLoc(Loc);
318 
319   if (Expansion != Spelling) {
320     // If the expansion and the spelling are different, output subobjects
321     // describing both locations.
322     JOS.attributeObject("spellingLoc", [Spelling, this] {
323       writeBareSourceLocation(Spelling, /*IsSpelling*/ true);
324     });
325     JOS.attributeObject("expansionLoc", [Expansion, Loc, this] {
326       writeBareSourceLocation(Expansion, /*IsSpelling*/ false);
327       // If there is a macro expansion, add extra information if the interesting
328       // bit is the macro arg expansion.
329       if (SM.isMacroArgExpansion(Loc))
330         JOS.attribute("isMacroArgExpansion", true);
331     });
332   } else
333     writeBareSourceLocation(Spelling, /*IsSpelling*/ true);
334 }
335 
336 void JSONNodeDumper::writeSourceRange(SourceRange R) {
337   JOS.attributeObject("begin",
338                       [R, this] { writeSourceLocation(R.getBegin()); });
339   JOS.attributeObject("end", [R, this] { writeSourceLocation(R.getEnd()); });
340 }
341 
342 std::string JSONNodeDumper::createPointerRepresentation(const void *Ptr) {
343   // Because JSON stores integer values as signed 64-bit integers, trying to
344   // represent them as such makes for very ugly pointer values in the resulting
345   // output. Instead, we convert the value to hex and treat it as a string.
346   return "0x" + llvm::utohexstr(reinterpret_cast<uint64_t>(Ptr), true);
347 }
348 
349 llvm::json::Object JSONNodeDumper::createQualType(QualType QT, bool Desugar) {
350   SplitQualType SQT = QT.split();
351   std::string SQTS = QualType::getAsString(SQT, PrintPolicy);
352   llvm::json::Object Ret{{"qualType", SQTS}};
353 
354   if (Desugar && !QT.isNull()) {
355     SplitQualType DSQT = QT.getSplitDesugaredType();
356     if (DSQT != SQT) {
357       std::string DSQTS = QualType::getAsString(DSQT, PrintPolicy);
358       if (DSQTS != SQTS)
359         Ret["desugaredQualType"] = DSQTS;
360     }
361     if (const auto *TT = QT->getAs<TypedefType>())
362       Ret["typeAliasDeclId"] = createPointerRepresentation(TT->getDecl());
363   }
364   return Ret;
365 }
366 
367 void JSONNodeDumper::writeBareDeclRef(const Decl *D) {
368   JOS.attribute("id", createPointerRepresentation(D));
369   if (!D)
370     return;
371 
372   JOS.attribute("kind", (llvm::Twine(D->getDeclKindName()) + "Decl").str());
373   if (const auto *ND = dyn_cast<NamedDecl>(D))
374     JOS.attribute("name", ND->getDeclName().getAsString());
375   if (const auto *VD = dyn_cast<ValueDecl>(D))
376     JOS.attribute("type", createQualType(VD->getType()));
377 }
378 
379 llvm::json::Object JSONNodeDumper::createBareDeclRef(const Decl *D) {
380   llvm::json::Object Ret{{"id", createPointerRepresentation(D)}};
381   if (!D)
382     return Ret;
383 
384   Ret["kind"] = (llvm::Twine(D->getDeclKindName()) + "Decl").str();
385   if (const auto *ND = dyn_cast<NamedDecl>(D))
386     Ret["name"] = ND->getDeclName().getAsString();
387   if (const auto *VD = dyn_cast<ValueDecl>(D))
388     Ret["type"] = createQualType(VD->getType());
389   return Ret;
390 }
391 
392 llvm::json::Array JSONNodeDumper::createCastPath(const CastExpr *C) {
393   llvm::json::Array Ret;
394   if (C->path_empty())
395     return Ret;
396 
397   for (auto I = C->path_begin(), E = C->path_end(); I != E; ++I) {
398     const CXXBaseSpecifier *Base = *I;
399     const auto *RD =
400         cast<CXXRecordDecl>(Base->getType()->castAs<RecordType>()->getDecl());
401 
402     llvm::json::Object Val{{"name", RD->getName()}};
403     if (Base->isVirtual())
404       Val["isVirtual"] = true;
405     Ret.push_back(std::move(Val));
406   }
407   return Ret;
408 }
409 
410 #define FIELD2(Name, Flag)  if (RD->Flag()) Ret[Name] = true
411 #define FIELD1(Flag)        FIELD2(#Flag, Flag)
412 
413 static llvm::json::Object
414 createDefaultConstructorDefinitionData(const CXXRecordDecl *RD) {
415   llvm::json::Object Ret;
416 
417   FIELD2("exists", hasDefaultConstructor);
418   FIELD2("trivial", hasTrivialDefaultConstructor);
419   FIELD2("nonTrivial", hasNonTrivialDefaultConstructor);
420   FIELD2("userProvided", hasUserProvidedDefaultConstructor);
421   FIELD2("isConstexpr", hasConstexprDefaultConstructor);
422   FIELD2("needsImplicit", needsImplicitDefaultConstructor);
423   FIELD2("defaultedIsConstexpr", defaultedDefaultConstructorIsConstexpr);
424 
425   return Ret;
426 }
427 
428 static llvm::json::Object
429 createCopyConstructorDefinitionData(const CXXRecordDecl *RD) {
430   llvm::json::Object Ret;
431 
432   FIELD2("simple", hasSimpleCopyConstructor);
433   FIELD2("trivial", hasTrivialCopyConstructor);
434   FIELD2("nonTrivial", hasNonTrivialCopyConstructor);
435   FIELD2("userDeclared", hasUserDeclaredCopyConstructor);
436   FIELD2("hasConstParam", hasCopyConstructorWithConstParam);
437   FIELD2("implicitHasConstParam", implicitCopyConstructorHasConstParam);
438   FIELD2("needsImplicit", needsImplicitCopyConstructor);
439   FIELD2("needsOverloadResolution", needsOverloadResolutionForCopyConstructor);
440   if (!RD->needsOverloadResolutionForCopyConstructor())
441     FIELD2("defaultedIsDeleted", defaultedCopyConstructorIsDeleted);
442 
443   return Ret;
444 }
445 
446 static llvm::json::Object
447 createMoveConstructorDefinitionData(const CXXRecordDecl *RD) {
448   llvm::json::Object Ret;
449 
450   FIELD2("exists", hasMoveConstructor);
451   FIELD2("simple", hasSimpleMoveConstructor);
452   FIELD2("trivial", hasTrivialMoveConstructor);
453   FIELD2("nonTrivial", hasNonTrivialMoveConstructor);
454   FIELD2("userDeclared", hasUserDeclaredMoveConstructor);
455   FIELD2("needsImplicit", needsImplicitMoveConstructor);
456   FIELD2("needsOverloadResolution", needsOverloadResolutionForMoveConstructor);
457   if (!RD->needsOverloadResolutionForMoveConstructor())
458     FIELD2("defaultedIsDeleted", defaultedMoveConstructorIsDeleted);
459 
460   return Ret;
461 }
462 
463 static llvm::json::Object
464 createCopyAssignmentDefinitionData(const CXXRecordDecl *RD) {
465   llvm::json::Object Ret;
466 
467   FIELD2("simple", hasSimpleCopyAssignment);
468   FIELD2("trivial", hasTrivialCopyAssignment);
469   FIELD2("nonTrivial", hasNonTrivialCopyAssignment);
470   FIELD2("hasConstParam", hasCopyAssignmentWithConstParam);
471   FIELD2("implicitHasConstParam", implicitCopyAssignmentHasConstParam);
472   FIELD2("userDeclared", hasUserDeclaredCopyAssignment);
473   FIELD2("needsImplicit", needsImplicitCopyAssignment);
474   FIELD2("needsOverloadResolution", needsOverloadResolutionForCopyAssignment);
475 
476   return Ret;
477 }
478 
479 static llvm::json::Object
480 createMoveAssignmentDefinitionData(const CXXRecordDecl *RD) {
481   llvm::json::Object Ret;
482 
483   FIELD2("exists", hasMoveAssignment);
484   FIELD2("simple", hasSimpleMoveAssignment);
485   FIELD2("trivial", hasTrivialMoveAssignment);
486   FIELD2("nonTrivial", hasNonTrivialMoveAssignment);
487   FIELD2("userDeclared", hasUserDeclaredMoveAssignment);
488   FIELD2("needsImplicit", needsImplicitMoveAssignment);
489   FIELD2("needsOverloadResolution", needsOverloadResolutionForMoveAssignment);
490 
491   return Ret;
492 }
493 
494 static llvm::json::Object
495 createDestructorDefinitionData(const CXXRecordDecl *RD) {
496   llvm::json::Object Ret;
497 
498   FIELD2("simple", hasSimpleDestructor);
499   FIELD2("irrelevant", hasIrrelevantDestructor);
500   FIELD2("trivial", hasTrivialDestructor);
501   FIELD2("nonTrivial", hasNonTrivialDestructor);
502   FIELD2("userDeclared", hasUserDeclaredDestructor);
503   FIELD2("needsImplicit", needsImplicitDestructor);
504   FIELD2("needsOverloadResolution", needsOverloadResolutionForDestructor);
505   if (!RD->needsOverloadResolutionForDestructor())
506     FIELD2("defaultedIsDeleted", defaultedDestructorIsDeleted);
507 
508   return Ret;
509 }
510 
511 llvm::json::Object
512 JSONNodeDumper::createCXXRecordDefinitionData(const CXXRecordDecl *RD) {
513   llvm::json::Object Ret;
514 
515   // This data is common to all C++ classes.
516   FIELD1(isGenericLambda);
517   FIELD1(isLambda);
518   FIELD1(isEmpty);
519   FIELD1(isAggregate);
520   FIELD1(isStandardLayout);
521   FIELD1(isTriviallyCopyable);
522   FIELD1(isPOD);
523   FIELD1(isTrivial);
524   FIELD1(isPolymorphic);
525   FIELD1(isAbstract);
526   FIELD1(isLiteral);
527   FIELD1(canPassInRegisters);
528   FIELD1(hasUserDeclaredConstructor);
529   FIELD1(hasConstexprNonCopyMoveConstructor);
530   FIELD1(hasMutableFields);
531   FIELD1(hasVariantMembers);
532   FIELD2("canConstDefaultInit", allowConstDefaultInit);
533 
534   Ret["defaultCtor"] = createDefaultConstructorDefinitionData(RD);
535   Ret["copyCtor"] = createCopyConstructorDefinitionData(RD);
536   Ret["moveCtor"] = createMoveConstructorDefinitionData(RD);
537   Ret["copyAssign"] = createCopyAssignmentDefinitionData(RD);
538   Ret["moveAssign"] = createMoveAssignmentDefinitionData(RD);
539   Ret["dtor"] = createDestructorDefinitionData(RD);
540 
541   return Ret;
542 }
543 
544 #undef FIELD1
545 #undef FIELD2
546 
547 std::string JSONNodeDumper::createAccessSpecifier(AccessSpecifier AS) {
548   const auto AccessSpelling = getAccessSpelling(AS);
549   if (AccessSpelling.empty())
550     return "none";
551   return AccessSpelling.str();
552 }
553 
554 llvm::json::Object
555 JSONNodeDumper::createCXXBaseSpecifier(const CXXBaseSpecifier &BS) {
556   llvm::json::Object Ret;
557 
558   Ret["type"] = createQualType(BS.getType());
559   Ret["access"] = createAccessSpecifier(BS.getAccessSpecifier());
560   Ret["writtenAccess"] =
561       createAccessSpecifier(BS.getAccessSpecifierAsWritten());
562   if (BS.isVirtual())
563     Ret["isVirtual"] = true;
564   if (BS.isPackExpansion())
565     Ret["isPackExpansion"] = true;
566 
567   return Ret;
568 }
569 
570 void JSONNodeDumper::VisitAliasAttr(const AliasAttr *AA) {
571   JOS.attribute("aliasee", AA->getAliasee());
572 }
573 
574 void JSONNodeDumper::VisitCleanupAttr(const CleanupAttr *CA) {
575   JOS.attribute("cleanup_function", createBareDeclRef(CA->getFunctionDecl()));
576 }
577 
578 void JSONNodeDumper::VisitDeprecatedAttr(const DeprecatedAttr *DA) {
579   if (!DA->getMessage().empty())
580     JOS.attribute("message", DA->getMessage());
581   if (!DA->getReplacement().empty())
582     JOS.attribute("replacement", DA->getReplacement());
583 }
584 
585 void JSONNodeDumper::VisitUnavailableAttr(const UnavailableAttr *UA) {
586   if (!UA->getMessage().empty())
587     JOS.attribute("message", UA->getMessage());
588 }
589 
590 void JSONNodeDumper::VisitSectionAttr(const SectionAttr *SA) {
591   JOS.attribute("section_name", SA->getName());
592 }
593 
594 void JSONNodeDumper::VisitVisibilityAttr(const VisibilityAttr *VA) {
595   JOS.attribute("visibility", VisibilityAttr::ConvertVisibilityTypeToStr(
596                                   VA->getVisibility()));
597 }
598 
599 void JSONNodeDumper::VisitTLSModelAttr(const TLSModelAttr *TA) {
600   JOS.attribute("tls_model", TA->getModel());
601 }
602 
603 void JSONNodeDumper::VisitTypedefType(const TypedefType *TT) {
604   JOS.attribute("decl", createBareDeclRef(TT->getDecl()));
605   if (!TT->typeMatchesDecl())
606     JOS.attribute("type", createQualType(TT->desugar()));
607 }
608 
609 void JSONNodeDumper::VisitUsingType(const UsingType *TT) {
610   JOS.attribute("decl", createBareDeclRef(TT->getFoundDecl()));
611   if (!TT->typeMatchesDecl())
612     JOS.attribute("type", createQualType(TT->desugar()));
613 }
614 
615 void JSONNodeDumper::VisitFunctionType(const FunctionType *T) {
616   FunctionType::ExtInfo E = T->getExtInfo();
617   attributeOnlyIfTrue("noreturn", E.getNoReturn());
618   attributeOnlyIfTrue("producesResult", E.getProducesResult());
619   if (E.getHasRegParm())
620     JOS.attribute("regParm", E.getRegParm());
621   JOS.attribute("cc", FunctionType::getNameForCallConv(E.getCC()));
622 }
623 
624 void JSONNodeDumper::VisitFunctionProtoType(const FunctionProtoType *T) {
625   FunctionProtoType::ExtProtoInfo E = T->getExtProtoInfo();
626   attributeOnlyIfTrue("trailingReturn", E.HasTrailingReturn);
627   attributeOnlyIfTrue("const", T->isConst());
628   attributeOnlyIfTrue("volatile", T->isVolatile());
629   attributeOnlyIfTrue("restrict", T->isRestrict());
630   attributeOnlyIfTrue("variadic", E.Variadic);
631   switch (E.RefQualifier) {
632   case RQ_LValue: JOS.attribute("refQualifier", "&"); break;
633   case RQ_RValue: JOS.attribute("refQualifier", "&&"); break;
634   case RQ_None: break;
635   }
636   switch (E.ExceptionSpec.Type) {
637   case EST_DynamicNone:
638   case EST_Dynamic: {
639     JOS.attribute("exceptionSpec", "throw");
640     llvm::json::Array Types;
641     for (QualType QT : E.ExceptionSpec.Exceptions)
642       Types.push_back(createQualType(QT));
643     JOS.attribute("exceptionTypes", std::move(Types));
644   } break;
645   case EST_MSAny:
646     JOS.attribute("exceptionSpec", "throw");
647     JOS.attribute("throwsAny", true);
648     break;
649   case EST_BasicNoexcept:
650     JOS.attribute("exceptionSpec", "noexcept");
651     break;
652   case EST_NoexceptTrue:
653   case EST_NoexceptFalse:
654     JOS.attribute("exceptionSpec", "noexcept");
655     JOS.attribute("conditionEvaluatesTo",
656                 E.ExceptionSpec.Type == EST_NoexceptTrue);
657     //JOS.attributeWithCall("exceptionSpecExpr",
658     //                    [this, E]() { Visit(E.ExceptionSpec.NoexceptExpr); });
659     break;
660   case EST_NoThrow:
661     JOS.attribute("exceptionSpec", "nothrow");
662     break;
663   // FIXME: I cannot find a way to trigger these cases while dumping the AST. I
664   // suspect you can only run into them when executing an AST dump from within
665   // the debugger, which is not a use case we worry about for the JSON dumping
666   // feature.
667   case EST_DependentNoexcept:
668   case EST_Unevaluated:
669   case EST_Uninstantiated:
670   case EST_Unparsed:
671   case EST_None: break;
672   }
673   VisitFunctionType(T);
674 }
675 
676 void JSONNodeDumper::VisitRValueReferenceType(const ReferenceType *RT) {
677   attributeOnlyIfTrue("spelledAsLValue", RT->isSpelledAsLValue());
678 }
679 
680 void JSONNodeDumper::VisitArrayType(const ArrayType *AT) {
681   switch (AT->getSizeModifier()) {
682   case ArraySizeModifier::Star:
683     JOS.attribute("sizeModifier", "*");
684     break;
685   case ArraySizeModifier::Static:
686     JOS.attribute("sizeModifier", "static");
687     break;
688   case ArraySizeModifier::Normal:
689     break;
690   }
691 
692   std::string Str = AT->getIndexTypeQualifiers().getAsString();
693   if (!Str.empty())
694     JOS.attribute("indexTypeQualifiers", Str);
695 }
696 
697 void JSONNodeDumper::VisitConstantArrayType(const ConstantArrayType *CAT) {
698   // FIXME: this should use ZExt instead of SExt, but JSON doesn't allow a
699   // narrowing conversion to int64_t so it cannot be expressed.
700   JOS.attribute("size", CAT->getSExtSize());
701   VisitArrayType(CAT);
702 }
703 
704 void JSONNodeDumper::VisitDependentSizedExtVectorType(
705     const DependentSizedExtVectorType *VT) {
706   JOS.attributeObject(
707       "attrLoc", [VT, this] { writeSourceLocation(VT->getAttributeLoc()); });
708 }
709 
710 void JSONNodeDumper::VisitVectorType(const VectorType *VT) {
711   JOS.attribute("numElements", VT->getNumElements());
712   switch (VT->getVectorKind()) {
713   case VectorKind::Generic:
714     break;
715   case VectorKind::AltiVecVector:
716     JOS.attribute("vectorKind", "altivec");
717     break;
718   case VectorKind::AltiVecPixel:
719     JOS.attribute("vectorKind", "altivec pixel");
720     break;
721   case VectorKind::AltiVecBool:
722     JOS.attribute("vectorKind", "altivec bool");
723     break;
724   case VectorKind::Neon:
725     JOS.attribute("vectorKind", "neon");
726     break;
727   case VectorKind::NeonPoly:
728     JOS.attribute("vectorKind", "neon poly");
729     break;
730   case VectorKind::SveFixedLengthData:
731     JOS.attribute("vectorKind", "fixed-length sve data vector");
732     break;
733   case VectorKind::SveFixedLengthPredicate:
734     JOS.attribute("vectorKind", "fixed-length sve predicate vector");
735     break;
736   case VectorKind::RVVFixedLengthData:
737     JOS.attribute("vectorKind", "fixed-length rvv data vector");
738     break;
739   case VectorKind::RVVFixedLengthMask:
740   case VectorKind::RVVFixedLengthMask_1:
741   case VectorKind::RVVFixedLengthMask_2:
742   case VectorKind::RVVFixedLengthMask_4:
743     JOS.attribute("vectorKind", "fixed-length rvv mask vector");
744     break;
745   }
746 }
747 
748 void JSONNodeDumper::VisitUnresolvedUsingType(const UnresolvedUsingType *UUT) {
749   JOS.attribute("decl", createBareDeclRef(UUT->getDecl()));
750 }
751 
752 void JSONNodeDumper::VisitUnaryTransformType(const UnaryTransformType *UTT) {
753   switch (UTT->getUTTKind()) {
754 #define TRANSFORM_TYPE_TRAIT_DEF(Enum, Trait)                                  \
755   case UnaryTransformType::Enum:                                               \
756     JOS.attribute("transformKind", #Trait);                                    \
757     break;
758 #include "clang/Basic/TransformTypeTraits.def"
759   }
760 }
761 
762 void JSONNodeDumper::VisitTagType(const TagType *TT) {
763   JOS.attribute("decl", createBareDeclRef(TT->getDecl()));
764 }
765 
766 void JSONNodeDumper::VisitTemplateTypeParmType(
767     const TemplateTypeParmType *TTPT) {
768   JOS.attribute("depth", TTPT->getDepth());
769   JOS.attribute("index", TTPT->getIndex());
770   attributeOnlyIfTrue("isPack", TTPT->isParameterPack());
771   JOS.attribute("decl", createBareDeclRef(TTPT->getDecl()));
772 }
773 
774 void JSONNodeDumper::VisitSubstTemplateTypeParmType(
775     const SubstTemplateTypeParmType *STTPT) {
776   JOS.attribute("index", STTPT->getIndex());
777   if (auto PackIndex = STTPT->getPackIndex())
778     JOS.attribute("pack_index", *PackIndex);
779 }
780 
781 void JSONNodeDumper::VisitSubstTemplateTypeParmPackType(
782     const SubstTemplateTypeParmPackType *T) {
783   JOS.attribute("index", T->getIndex());
784 }
785 
786 void JSONNodeDumper::VisitAutoType(const AutoType *AT) {
787   JOS.attribute("undeduced", !AT->isDeduced());
788   switch (AT->getKeyword()) {
789   case AutoTypeKeyword::Auto:
790     JOS.attribute("typeKeyword", "auto");
791     break;
792   case AutoTypeKeyword::DecltypeAuto:
793     JOS.attribute("typeKeyword", "decltype(auto)");
794     break;
795   case AutoTypeKeyword::GNUAutoType:
796     JOS.attribute("typeKeyword", "__auto_type");
797     break;
798   }
799 }
800 
801 void JSONNodeDumper::VisitTemplateSpecializationType(
802     const TemplateSpecializationType *TST) {
803   attributeOnlyIfTrue("isAlias", TST->isTypeAlias());
804 
805   std::string Str;
806   llvm::raw_string_ostream OS(Str);
807   TST->getTemplateName().print(OS, PrintPolicy);
808   JOS.attribute("templateName", Str);
809 }
810 
811 void JSONNodeDumper::VisitInjectedClassNameType(
812     const InjectedClassNameType *ICNT) {
813   JOS.attribute("decl", createBareDeclRef(ICNT->getDecl()));
814 }
815 
816 void JSONNodeDumper::VisitObjCInterfaceType(const ObjCInterfaceType *OIT) {
817   JOS.attribute("decl", createBareDeclRef(OIT->getDecl()));
818 }
819 
820 void JSONNodeDumper::VisitPackExpansionType(const PackExpansionType *PET) {
821   if (std::optional<unsigned> N = PET->getNumExpansions())
822     JOS.attribute("numExpansions", *N);
823 }
824 
825 void JSONNodeDumper::VisitElaboratedType(const ElaboratedType *ET) {
826   if (const NestedNameSpecifier *NNS = ET->getQualifier()) {
827     std::string Str;
828     llvm::raw_string_ostream OS(Str);
829     NNS->print(OS, PrintPolicy, /*ResolveTemplateArgs*/ true);
830     JOS.attribute("qualifier", Str);
831   }
832   if (const TagDecl *TD = ET->getOwnedTagDecl())
833     JOS.attribute("ownedTagDecl", createBareDeclRef(TD));
834 }
835 
836 void JSONNodeDumper::VisitMacroQualifiedType(const MacroQualifiedType *MQT) {
837   JOS.attribute("macroName", MQT->getMacroIdentifier()->getName());
838 }
839 
840 void JSONNodeDumper::VisitMemberPointerType(const MemberPointerType *MPT) {
841   attributeOnlyIfTrue("isData", MPT->isMemberDataPointer());
842   attributeOnlyIfTrue("isFunction", MPT->isMemberFunctionPointer());
843 }
844 
845 void JSONNodeDumper::VisitNamedDecl(const NamedDecl *ND) {
846   if (ND && ND->getDeclName()) {
847     JOS.attribute("name", ND->getNameAsString());
848     // FIXME: There are likely other contexts in which it makes no sense to ask
849     // for a mangled name.
850     if (isa<RequiresExprBodyDecl>(ND->getDeclContext()))
851       return;
852 
853     // If the declaration is dependent or is in a dependent context, then the
854     // mangling is unlikely to be meaningful (and in some cases may cause
855     // "don't know how to mangle this" assertion failures.
856     if (ND->isTemplated())
857       return;
858 
859     // Mangled names are not meaningful for locals, and may not be well-defined
860     // in the case of VLAs.
861     auto *VD = dyn_cast<VarDecl>(ND);
862     if (VD && VD->hasLocalStorage())
863       return;
864 
865     // Do not mangle template deduction guides.
866     if (isa<CXXDeductionGuideDecl>(ND))
867       return;
868 
869     std::string MangledName = ASTNameGen.getName(ND);
870     if (!MangledName.empty())
871       JOS.attribute("mangledName", MangledName);
872   }
873 }
874 
875 void JSONNodeDumper::VisitTypedefDecl(const TypedefDecl *TD) {
876   VisitNamedDecl(TD);
877   JOS.attribute("type", createQualType(TD->getUnderlyingType()));
878 }
879 
880 void JSONNodeDumper::VisitTypeAliasDecl(const TypeAliasDecl *TAD) {
881   VisitNamedDecl(TAD);
882   JOS.attribute("type", createQualType(TAD->getUnderlyingType()));
883 }
884 
885 void JSONNodeDumper::VisitNamespaceDecl(const NamespaceDecl *ND) {
886   VisitNamedDecl(ND);
887   attributeOnlyIfTrue("isInline", ND->isInline());
888   attributeOnlyIfTrue("isNested", ND->isNested());
889   if (!ND->isFirstDecl())
890     JOS.attribute("originalNamespace", createBareDeclRef(ND->getFirstDecl()));
891 }
892 
893 void JSONNodeDumper::VisitUsingDirectiveDecl(const UsingDirectiveDecl *UDD) {
894   JOS.attribute("nominatedNamespace",
895                 createBareDeclRef(UDD->getNominatedNamespace()));
896 }
897 
898 void JSONNodeDumper::VisitNamespaceAliasDecl(const NamespaceAliasDecl *NAD) {
899   VisitNamedDecl(NAD);
900   JOS.attribute("aliasedNamespace",
901                 createBareDeclRef(NAD->getAliasedNamespace()));
902 }
903 
904 void JSONNodeDumper::VisitUsingDecl(const UsingDecl *UD) {
905   std::string Name;
906   if (const NestedNameSpecifier *NNS = UD->getQualifier()) {
907     llvm::raw_string_ostream SOS(Name);
908     NNS->print(SOS, UD->getASTContext().getPrintingPolicy());
909   }
910   Name += UD->getNameAsString();
911   JOS.attribute("name", Name);
912 }
913 
914 void JSONNodeDumper::VisitUsingEnumDecl(const UsingEnumDecl *UED) {
915   JOS.attribute("target", createBareDeclRef(UED->getEnumDecl()));
916 }
917 
918 void JSONNodeDumper::VisitUsingShadowDecl(const UsingShadowDecl *USD) {
919   JOS.attribute("target", createBareDeclRef(USD->getTargetDecl()));
920 }
921 
922 void JSONNodeDumper::VisitVarDecl(const VarDecl *VD) {
923   VisitNamedDecl(VD);
924   JOS.attribute("type", createQualType(VD->getType()));
925   if (const auto *P = dyn_cast<ParmVarDecl>(VD))
926     attributeOnlyIfTrue("explicitObjectParameter",
927                         P->isExplicitObjectParameter());
928 
929   StorageClass SC = VD->getStorageClass();
930   if (SC != SC_None)
931     JOS.attribute("storageClass", VarDecl::getStorageClassSpecifierString(SC));
932   switch (VD->getTLSKind()) {
933   case VarDecl::TLS_Dynamic: JOS.attribute("tls", "dynamic"); break;
934   case VarDecl::TLS_Static: JOS.attribute("tls", "static"); break;
935   case VarDecl::TLS_None: break;
936   }
937   attributeOnlyIfTrue("nrvo", VD->isNRVOVariable());
938   attributeOnlyIfTrue("inline", VD->isInline());
939   attributeOnlyIfTrue("constexpr", VD->isConstexpr());
940   attributeOnlyIfTrue("modulePrivate", VD->isModulePrivate());
941   if (VD->hasInit()) {
942     switch (VD->getInitStyle()) {
943     case VarDecl::CInit: JOS.attribute("init", "c");  break;
944     case VarDecl::CallInit: JOS.attribute("init", "call"); break;
945     case VarDecl::ListInit: JOS.attribute("init", "list"); break;
946     case VarDecl::ParenListInit:
947       JOS.attribute("init", "paren-list");
948       break;
949     }
950   }
951   attributeOnlyIfTrue("isParameterPack", VD->isParameterPack());
952 }
953 
954 void JSONNodeDumper::VisitFieldDecl(const FieldDecl *FD) {
955   VisitNamedDecl(FD);
956   JOS.attribute("type", createQualType(FD->getType()));
957   attributeOnlyIfTrue("mutable", FD->isMutable());
958   attributeOnlyIfTrue("modulePrivate", FD->isModulePrivate());
959   attributeOnlyIfTrue("isBitfield", FD->isBitField());
960   attributeOnlyIfTrue("hasInClassInitializer", FD->hasInClassInitializer());
961 }
962 
963 void JSONNodeDumper::VisitFunctionDecl(const FunctionDecl *FD) {
964   VisitNamedDecl(FD);
965   JOS.attribute("type", createQualType(FD->getType()));
966   StorageClass SC = FD->getStorageClass();
967   if (SC != SC_None)
968     JOS.attribute("storageClass", VarDecl::getStorageClassSpecifierString(SC));
969   attributeOnlyIfTrue("inline", FD->isInlineSpecified());
970   attributeOnlyIfTrue("virtual", FD->isVirtualAsWritten());
971   attributeOnlyIfTrue("pure", FD->isPureVirtual());
972   attributeOnlyIfTrue("explicitlyDeleted", FD->isDeletedAsWritten());
973   attributeOnlyIfTrue("constexpr", FD->isConstexpr());
974   attributeOnlyIfTrue("variadic", FD->isVariadic());
975   attributeOnlyIfTrue("immediate", FD->isImmediateFunction());
976 
977   if (FD->isDefaulted())
978     JOS.attribute("explicitlyDefaulted",
979                   FD->isDeleted() ? "deleted" : "default");
980 
981   if (StringLiteral *Msg = FD->getDeletedMessage())
982     JOS.attribute("deletedMessage", Msg->getString());
983 }
984 
985 void JSONNodeDumper::VisitEnumDecl(const EnumDecl *ED) {
986   VisitNamedDecl(ED);
987   if (ED->isFixed())
988     JOS.attribute("fixedUnderlyingType", createQualType(ED->getIntegerType()));
989   if (ED->isScoped())
990     JOS.attribute("scopedEnumTag",
991                   ED->isScopedUsingClassTag() ? "class" : "struct");
992 }
993 void JSONNodeDumper::VisitEnumConstantDecl(const EnumConstantDecl *ECD) {
994   VisitNamedDecl(ECD);
995   JOS.attribute("type", createQualType(ECD->getType()));
996 }
997 
998 void JSONNodeDumper::VisitRecordDecl(const RecordDecl *RD) {
999   VisitNamedDecl(RD);
1000   JOS.attribute("tagUsed", RD->getKindName());
1001   attributeOnlyIfTrue("completeDefinition", RD->isCompleteDefinition());
1002 }
1003 void JSONNodeDumper::VisitCXXRecordDecl(const CXXRecordDecl *RD) {
1004   VisitRecordDecl(RD);
1005 
1006   // All other information requires a complete definition.
1007   if (!RD->isCompleteDefinition())
1008     return;
1009 
1010   JOS.attribute("definitionData", createCXXRecordDefinitionData(RD));
1011   if (RD->getNumBases()) {
1012     JOS.attributeArray("bases", [this, RD] {
1013       for (const auto &Spec : RD->bases())
1014         JOS.value(createCXXBaseSpecifier(Spec));
1015     });
1016   }
1017 }
1018 
1019 void JSONNodeDumper::VisitHLSLBufferDecl(const HLSLBufferDecl *D) {
1020   VisitNamedDecl(D);
1021   JOS.attribute("bufferKind", D->isCBuffer() ? "cbuffer" : "tbuffer");
1022 }
1023 
1024 void JSONNodeDumper::VisitTemplateTypeParmDecl(const TemplateTypeParmDecl *D) {
1025   VisitNamedDecl(D);
1026   JOS.attribute("tagUsed", D->wasDeclaredWithTypename() ? "typename" : "class");
1027   JOS.attribute("depth", D->getDepth());
1028   JOS.attribute("index", D->getIndex());
1029   attributeOnlyIfTrue("isParameterPack", D->isParameterPack());
1030 
1031   if (D->hasDefaultArgument())
1032     JOS.attributeObject("defaultArg", [=] {
1033       Visit(D->getDefaultArgument().getArgument(), SourceRange(),
1034             D->getDefaultArgStorage().getInheritedFrom(),
1035             D->defaultArgumentWasInherited() ? "inherited from" : "previous");
1036     });
1037 }
1038 
1039 void JSONNodeDumper::VisitNonTypeTemplateParmDecl(
1040     const NonTypeTemplateParmDecl *D) {
1041   VisitNamedDecl(D);
1042   JOS.attribute("type", createQualType(D->getType()));
1043   JOS.attribute("depth", D->getDepth());
1044   JOS.attribute("index", D->getIndex());
1045   attributeOnlyIfTrue("isParameterPack", D->isParameterPack());
1046 
1047   if (D->hasDefaultArgument())
1048     JOS.attributeObject("defaultArg", [=] {
1049       Visit(D->getDefaultArgument().getArgument(), SourceRange(),
1050             D->getDefaultArgStorage().getInheritedFrom(),
1051             D->defaultArgumentWasInherited() ? "inherited from" : "previous");
1052     });
1053 }
1054 
1055 void JSONNodeDumper::VisitTemplateTemplateParmDecl(
1056     const TemplateTemplateParmDecl *D) {
1057   VisitNamedDecl(D);
1058   JOS.attribute("depth", D->getDepth());
1059   JOS.attribute("index", D->getIndex());
1060   attributeOnlyIfTrue("isParameterPack", D->isParameterPack());
1061 
1062   if (D->hasDefaultArgument())
1063     JOS.attributeObject("defaultArg", [=] {
1064       const auto *InheritedFrom = D->getDefaultArgStorage().getInheritedFrom();
1065       Visit(D->getDefaultArgument().getArgument(),
1066             InheritedFrom ? InheritedFrom->getSourceRange() : SourceLocation{},
1067             InheritedFrom,
1068             D->defaultArgumentWasInherited() ? "inherited from" : "previous");
1069     });
1070 }
1071 
1072 void JSONNodeDumper::VisitLinkageSpecDecl(const LinkageSpecDecl *LSD) {
1073   StringRef Lang;
1074   switch (LSD->getLanguage()) {
1075   case LinkageSpecLanguageIDs::C:
1076     Lang = "C";
1077     break;
1078   case LinkageSpecLanguageIDs::CXX:
1079     Lang = "C++";
1080     break;
1081   }
1082   JOS.attribute("language", Lang);
1083   attributeOnlyIfTrue("hasBraces", LSD->hasBraces());
1084 }
1085 
1086 void JSONNodeDumper::VisitAccessSpecDecl(const AccessSpecDecl *ASD) {
1087   JOS.attribute("access", createAccessSpecifier(ASD->getAccess()));
1088 }
1089 
1090 void JSONNodeDumper::VisitFriendDecl(const FriendDecl *FD) {
1091   if (const TypeSourceInfo *T = FD->getFriendType())
1092     JOS.attribute("type", createQualType(T->getType()));
1093   attributeOnlyIfTrue("isPackExpansion", FD->isPackExpansion());
1094 }
1095 
1096 void JSONNodeDumper::VisitObjCIvarDecl(const ObjCIvarDecl *D) {
1097   VisitNamedDecl(D);
1098   JOS.attribute("type", createQualType(D->getType()));
1099   attributeOnlyIfTrue("synthesized", D->getSynthesize());
1100   switch (D->getAccessControl()) {
1101   case ObjCIvarDecl::None: JOS.attribute("access", "none"); break;
1102   case ObjCIvarDecl::Private: JOS.attribute("access", "private"); break;
1103   case ObjCIvarDecl::Protected: JOS.attribute("access", "protected"); break;
1104   case ObjCIvarDecl::Public: JOS.attribute("access", "public"); break;
1105   case ObjCIvarDecl::Package: JOS.attribute("access", "package"); break;
1106   }
1107 }
1108 
1109 void JSONNodeDumper::VisitObjCMethodDecl(const ObjCMethodDecl *D) {
1110   VisitNamedDecl(D);
1111   JOS.attribute("returnType", createQualType(D->getReturnType()));
1112   JOS.attribute("instance", D->isInstanceMethod());
1113   attributeOnlyIfTrue("variadic", D->isVariadic());
1114 }
1115 
1116 void JSONNodeDumper::VisitObjCTypeParamDecl(const ObjCTypeParamDecl *D) {
1117   VisitNamedDecl(D);
1118   JOS.attribute("type", createQualType(D->getUnderlyingType()));
1119   attributeOnlyIfTrue("bounded", D->hasExplicitBound());
1120   switch (D->getVariance()) {
1121   case ObjCTypeParamVariance::Invariant:
1122     break;
1123   case ObjCTypeParamVariance::Covariant:
1124     JOS.attribute("variance", "covariant");
1125     break;
1126   case ObjCTypeParamVariance::Contravariant:
1127     JOS.attribute("variance", "contravariant");
1128     break;
1129   }
1130 }
1131 
1132 void JSONNodeDumper::VisitObjCCategoryDecl(const ObjCCategoryDecl *D) {
1133   VisitNamedDecl(D);
1134   JOS.attribute("interface", createBareDeclRef(D->getClassInterface()));
1135   JOS.attribute("implementation", createBareDeclRef(D->getImplementation()));
1136 
1137   llvm::json::Array Protocols;
1138   for (const auto* P : D->protocols())
1139     Protocols.push_back(createBareDeclRef(P));
1140   if (!Protocols.empty())
1141     JOS.attribute("protocols", std::move(Protocols));
1142 }
1143 
1144 void JSONNodeDumper::VisitObjCCategoryImplDecl(const ObjCCategoryImplDecl *D) {
1145   VisitNamedDecl(D);
1146   JOS.attribute("interface", createBareDeclRef(D->getClassInterface()));
1147   JOS.attribute("categoryDecl", createBareDeclRef(D->getCategoryDecl()));
1148 }
1149 
1150 void JSONNodeDumper::VisitObjCProtocolDecl(const ObjCProtocolDecl *D) {
1151   VisitNamedDecl(D);
1152 
1153   llvm::json::Array Protocols;
1154   for (const auto *P : D->protocols())
1155     Protocols.push_back(createBareDeclRef(P));
1156   if (!Protocols.empty())
1157     JOS.attribute("protocols", std::move(Protocols));
1158 }
1159 
1160 void JSONNodeDumper::VisitObjCInterfaceDecl(const ObjCInterfaceDecl *D) {
1161   VisitNamedDecl(D);
1162   JOS.attribute("super", createBareDeclRef(D->getSuperClass()));
1163   JOS.attribute("implementation", createBareDeclRef(D->getImplementation()));
1164 
1165   llvm::json::Array Protocols;
1166   for (const auto* P : D->protocols())
1167     Protocols.push_back(createBareDeclRef(P));
1168   if (!Protocols.empty())
1169     JOS.attribute("protocols", std::move(Protocols));
1170 }
1171 
1172 void JSONNodeDumper::VisitObjCImplementationDecl(
1173     const ObjCImplementationDecl *D) {
1174   VisitNamedDecl(D);
1175   JOS.attribute("super", createBareDeclRef(D->getSuperClass()));
1176   JOS.attribute("interface", createBareDeclRef(D->getClassInterface()));
1177 }
1178 
1179 void JSONNodeDumper::VisitObjCCompatibleAliasDecl(
1180     const ObjCCompatibleAliasDecl *D) {
1181   VisitNamedDecl(D);
1182   JOS.attribute("interface", createBareDeclRef(D->getClassInterface()));
1183 }
1184 
1185 void JSONNodeDumper::VisitObjCPropertyDecl(const ObjCPropertyDecl *D) {
1186   VisitNamedDecl(D);
1187   JOS.attribute("type", createQualType(D->getType()));
1188 
1189   switch (D->getPropertyImplementation()) {
1190   case ObjCPropertyDecl::None: break;
1191   case ObjCPropertyDecl::Required: JOS.attribute("control", "required"); break;
1192   case ObjCPropertyDecl::Optional: JOS.attribute("control", "optional"); break;
1193   }
1194 
1195   ObjCPropertyAttribute::Kind Attrs = D->getPropertyAttributes();
1196   if (Attrs != ObjCPropertyAttribute::kind_noattr) {
1197     if (Attrs & ObjCPropertyAttribute::kind_getter)
1198       JOS.attribute("getter", createBareDeclRef(D->getGetterMethodDecl()));
1199     if (Attrs & ObjCPropertyAttribute::kind_setter)
1200       JOS.attribute("setter", createBareDeclRef(D->getSetterMethodDecl()));
1201     attributeOnlyIfTrue("readonly",
1202                         Attrs & ObjCPropertyAttribute::kind_readonly);
1203     attributeOnlyIfTrue("assign", Attrs & ObjCPropertyAttribute::kind_assign);
1204     attributeOnlyIfTrue("readwrite",
1205                         Attrs & ObjCPropertyAttribute::kind_readwrite);
1206     attributeOnlyIfTrue("retain", Attrs & ObjCPropertyAttribute::kind_retain);
1207     attributeOnlyIfTrue("copy", Attrs & ObjCPropertyAttribute::kind_copy);
1208     attributeOnlyIfTrue("nonatomic",
1209                         Attrs & ObjCPropertyAttribute::kind_nonatomic);
1210     attributeOnlyIfTrue("atomic", Attrs & ObjCPropertyAttribute::kind_atomic);
1211     attributeOnlyIfTrue("weak", Attrs & ObjCPropertyAttribute::kind_weak);
1212     attributeOnlyIfTrue("strong", Attrs & ObjCPropertyAttribute::kind_strong);
1213     attributeOnlyIfTrue("unsafe_unretained",
1214                         Attrs & ObjCPropertyAttribute::kind_unsafe_unretained);
1215     attributeOnlyIfTrue("class", Attrs & ObjCPropertyAttribute::kind_class);
1216     attributeOnlyIfTrue("direct", Attrs & ObjCPropertyAttribute::kind_direct);
1217     attributeOnlyIfTrue("nullability",
1218                         Attrs & ObjCPropertyAttribute::kind_nullability);
1219     attributeOnlyIfTrue("null_resettable",
1220                         Attrs & ObjCPropertyAttribute::kind_null_resettable);
1221   }
1222 }
1223 
1224 void JSONNodeDumper::VisitObjCPropertyImplDecl(const ObjCPropertyImplDecl *D) {
1225   VisitNamedDecl(D->getPropertyDecl());
1226   JOS.attribute("implKind", D->getPropertyImplementation() ==
1227                                     ObjCPropertyImplDecl::Synthesize
1228                                 ? "synthesize"
1229                                 : "dynamic");
1230   JOS.attribute("propertyDecl", createBareDeclRef(D->getPropertyDecl()));
1231   JOS.attribute("ivarDecl", createBareDeclRef(D->getPropertyIvarDecl()));
1232 }
1233 
1234 void JSONNodeDumper::VisitBlockDecl(const BlockDecl *D) {
1235   attributeOnlyIfTrue("variadic", D->isVariadic());
1236   attributeOnlyIfTrue("capturesThis", D->capturesCXXThis());
1237 }
1238 
1239 void JSONNodeDumper::VisitAtomicExpr(const AtomicExpr *AE) {
1240   JOS.attribute("name", AE->getOpAsString());
1241 }
1242 
1243 void JSONNodeDumper::VisitObjCEncodeExpr(const ObjCEncodeExpr *OEE) {
1244   JOS.attribute("encodedType", createQualType(OEE->getEncodedType()));
1245 }
1246 
1247 void JSONNodeDumper::VisitObjCMessageExpr(const ObjCMessageExpr *OME) {
1248   std::string Str;
1249   llvm::raw_string_ostream OS(Str);
1250 
1251   OME->getSelector().print(OS);
1252   JOS.attribute("selector", Str);
1253 
1254   switch (OME->getReceiverKind()) {
1255   case ObjCMessageExpr::Instance:
1256     JOS.attribute("receiverKind", "instance");
1257     break;
1258   case ObjCMessageExpr::Class:
1259     JOS.attribute("receiverKind", "class");
1260     JOS.attribute("classType", createQualType(OME->getClassReceiver()));
1261     break;
1262   case ObjCMessageExpr::SuperInstance:
1263     JOS.attribute("receiverKind", "super (instance)");
1264     JOS.attribute("superType", createQualType(OME->getSuperType()));
1265     break;
1266   case ObjCMessageExpr::SuperClass:
1267     JOS.attribute("receiverKind", "super (class)");
1268     JOS.attribute("superType", createQualType(OME->getSuperType()));
1269     break;
1270   }
1271 
1272   QualType CallReturnTy = OME->getCallReturnType(Ctx);
1273   if (OME->getType() != CallReturnTy)
1274     JOS.attribute("callReturnType", createQualType(CallReturnTy));
1275 }
1276 
1277 void JSONNodeDumper::VisitObjCBoxedExpr(const ObjCBoxedExpr *OBE) {
1278   if (const ObjCMethodDecl *MD = OBE->getBoxingMethod()) {
1279     std::string Str;
1280     llvm::raw_string_ostream OS(Str);
1281 
1282     MD->getSelector().print(OS);
1283     JOS.attribute("selector", Str);
1284   }
1285 }
1286 
1287 void JSONNodeDumper::VisitObjCSelectorExpr(const ObjCSelectorExpr *OSE) {
1288   std::string Str;
1289   llvm::raw_string_ostream OS(Str);
1290 
1291   OSE->getSelector().print(OS);
1292   JOS.attribute("selector", Str);
1293 }
1294 
1295 void JSONNodeDumper::VisitObjCProtocolExpr(const ObjCProtocolExpr *OPE) {
1296   JOS.attribute("protocol", createBareDeclRef(OPE->getProtocol()));
1297 }
1298 
1299 void JSONNodeDumper::VisitObjCPropertyRefExpr(const ObjCPropertyRefExpr *OPRE) {
1300   if (OPRE->isImplicitProperty()) {
1301     JOS.attribute("propertyKind", "implicit");
1302     if (const ObjCMethodDecl *MD = OPRE->getImplicitPropertyGetter())
1303       JOS.attribute("getter", createBareDeclRef(MD));
1304     if (const ObjCMethodDecl *MD = OPRE->getImplicitPropertySetter())
1305       JOS.attribute("setter", createBareDeclRef(MD));
1306   } else {
1307     JOS.attribute("propertyKind", "explicit");
1308     JOS.attribute("property", createBareDeclRef(OPRE->getExplicitProperty()));
1309   }
1310 
1311   attributeOnlyIfTrue("isSuperReceiver", OPRE->isSuperReceiver());
1312   attributeOnlyIfTrue("isMessagingGetter", OPRE->isMessagingGetter());
1313   attributeOnlyIfTrue("isMessagingSetter", OPRE->isMessagingSetter());
1314 }
1315 
1316 void JSONNodeDumper::VisitObjCSubscriptRefExpr(
1317     const ObjCSubscriptRefExpr *OSRE) {
1318   JOS.attribute("subscriptKind",
1319                 OSRE->isArraySubscriptRefExpr() ? "array" : "dictionary");
1320 
1321   if (const ObjCMethodDecl *MD = OSRE->getAtIndexMethodDecl())
1322     JOS.attribute("getter", createBareDeclRef(MD));
1323   if (const ObjCMethodDecl *MD = OSRE->setAtIndexMethodDecl())
1324     JOS.attribute("setter", createBareDeclRef(MD));
1325 }
1326 
1327 void JSONNodeDumper::VisitObjCIvarRefExpr(const ObjCIvarRefExpr *OIRE) {
1328   JOS.attribute("decl", createBareDeclRef(OIRE->getDecl()));
1329   attributeOnlyIfTrue("isFreeIvar", OIRE->isFreeIvar());
1330   JOS.attribute("isArrow", OIRE->isArrow());
1331 }
1332 
1333 void JSONNodeDumper::VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *OBLE) {
1334   JOS.attribute("value", OBLE->getValue() ? "__objc_yes" : "__objc_no");
1335 }
1336 
1337 void JSONNodeDumper::VisitDeclRefExpr(const DeclRefExpr *DRE) {
1338   JOS.attribute("referencedDecl", createBareDeclRef(DRE->getDecl()));
1339   if (DRE->getDecl() != DRE->getFoundDecl())
1340     JOS.attribute("foundReferencedDecl",
1341                   createBareDeclRef(DRE->getFoundDecl()));
1342   switch (DRE->isNonOdrUse()) {
1343   case NOUR_None: break;
1344   case NOUR_Unevaluated: JOS.attribute("nonOdrUseReason", "unevaluated"); break;
1345   case NOUR_Constant: JOS.attribute("nonOdrUseReason", "constant"); break;
1346   case NOUR_Discarded: JOS.attribute("nonOdrUseReason", "discarded"); break;
1347   }
1348   attributeOnlyIfTrue("isImmediateEscalating", DRE->isImmediateEscalating());
1349 }
1350 
1351 void JSONNodeDumper::VisitSYCLUniqueStableNameExpr(
1352     const SYCLUniqueStableNameExpr *E) {
1353   JOS.attribute("typeSourceInfo",
1354                 createQualType(E->getTypeSourceInfo()->getType()));
1355 }
1356 
1357 void JSONNodeDumper::VisitOpenACCAsteriskSizeExpr(
1358     const OpenACCAsteriskSizeExpr *E) {}
1359 
1360 void JSONNodeDumper::VisitPredefinedExpr(const PredefinedExpr *PE) {
1361   JOS.attribute("name", PredefinedExpr::getIdentKindName(PE->getIdentKind()));
1362 }
1363 
1364 void JSONNodeDumper::VisitUnaryOperator(const UnaryOperator *UO) {
1365   JOS.attribute("isPostfix", UO->isPostfix());
1366   JOS.attribute("opcode", UnaryOperator::getOpcodeStr(UO->getOpcode()));
1367   if (!UO->canOverflow())
1368     JOS.attribute("canOverflow", false);
1369 }
1370 
1371 void JSONNodeDumper::VisitBinaryOperator(const BinaryOperator *BO) {
1372   JOS.attribute("opcode", BinaryOperator::getOpcodeStr(BO->getOpcode()));
1373 }
1374 
1375 void JSONNodeDumper::VisitCompoundAssignOperator(
1376     const CompoundAssignOperator *CAO) {
1377   VisitBinaryOperator(CAO);
1378   JOS.attribute("computeLHSType", createQualType(CAO->getComputationLHSType()));
1379   JOS.attribute("computeResultType",
1380                 createQualType(CAO->getComputationResultType()));
1381 }
1382 
1383 void JSONNodeDumper::VisitMemberExpr(const MemberExpr *ME) {
1384   // Note, we always write this Boolean field because the information it conveys
1385   // is critical to understanding the AST node.
1386   ValueDecl *VD = ME->getMemberDecl();
1387   JOS.attribute("name", VD && VD->getDeclName() ? VD->getNameAsString() : "");
1388   JOS.attribute("isArrow", ME->isArrow());
1389   JOS.attribute("referencedMemberDecl", createPointerRepresentation(VD));
1390   switch (ME->isNonOdrUse()) {
1391   case NOUR_None: break;
1392   case NOUR_Unevaluated: JOS.attribute("nonOdrUseReason", "unevaluated"); break;
1393   case NOUR_Constant: JOS.attribute("nonOdrUseReason", "constant"); break;
1394   case NOUR_Discarded: JOS.attribute("nonOdrUseReason", "discarded"); break;
1395   }
1396 }
1397 
1398 void JSONNodeDumper::VisitCXXNewExpr(const CXXNewExpr *NE) {
1399   attributeOnlyIfTrue("isGlobal", NE->isGlobalNew());
1400   attributeOnlyIfTrue("isArray", NE->isArray());
1401   attributeOnlyIfTrue("isPlacement", NE->getNumPlacementArgs() != 0);
1402   switch (NE->getInitializationStyle()) {
1403   case CXXNewInitializationStyle::None:
1404     break;
1405   case CXXNewInitializationStyle::Parens:
1406     JOS.attribute("initStyle", "call");
1407     break;
1408   case CXXNewInitializationStyle::Braces:
1409     JOS.attribute("initStyle", "list");
1410     break;
1411   }
1412   if (const FunctionDecl *FD = NE->getOperatorNew())
1413     JOS.attribute("operatorNewDecl", createBareDeclRef(FD));
1414   if (const FunctionDecl *FD = NE->getOperatorDelete())
1415     JOS.attribute("operatorDeleteDecl", createBareDeclRef(FD));
1416 }
1417 void JSONNodeDumper::VisitCXXDeleteExpr(const CXXDeleteExpr *DE) {
1418   attributeOnlyIfTrue("isGlobal", DE->isGlobalDelete());
1419   attributeOnlyIfTrue("isArray", DE->isArrayForm());
1420   attributeOnlyIfTrue("isArrayAsWritten", DE->isArrayFormAsWritten());
1421   if (const FunctionDecl *FD = DE->getOperatorDelete())
1422     JOS.attribute("operatorDeleteDecl", createBareDeclRef(FD));
1423 }
1424 
1425 void JSONNodeDumper::VisitCXXThisExpr(const CXXThisExpr *TE) {
1426   attributeOnlyIfTrue("implicit", TE->isImplicit());
1427 }
1428 
1429 void JSONNodeDumper::VisitCastExpr(const CastExpr *CE) {
1430   JOS.attribute("castKind", CE->getCastKindName());
1431   llvm::json::Array Path = createCastPath(CE);
1432   if (!Path.empty())
1433     JOS.attribute("path", std::move(Path));
1434   // FIXME: This may not be useful information as it can be obtusely gleaned
1435   // from the inner[] array.
1436   if (const NamedDecl *ND = CE->getConversionFunction())
1437     JOS.attribute("conversionFunc", createBareDeclRef(ND));
1438 }
1439 
1440 void JSONNodeDumper::VisitImplicitCastExpr(const ImplicitCastExpr *ICE) {
1441   VisitCastExpr(ICE);
1442   attributeOnlyIfTrue("isPartOfExplicitCast", ICE->isPartOfExplicitCast());
1443 }
1444 
1445 void JSONNodeDumper::VisitCallExpr(const CallExpr *CE) {
1446   attributeOnlyIfTrue("adl", CE->usesADL());
1447 }
1448 
1449 void JSONNodeDumper::VisitUnaryExprOrTypeTraitExpr(
1450     const UnaryExprOrTypeTraitExpr *TTE) {
1451   JOS.attribute("name", getTraitSpelling(TTE->getKind()));
1452   if (TTE->isArgumentType())
1453     JOS.attribute("argType", createQualType(TTE->getArgumentType()));
1454 }
1455 
1456 void JSONNodeDumper::VisitSizeOfPackExpr(const SizeOfPackExpr *SOPE) {
1457   VisitNamedDecl(SOPE->getPack());
1458 }
1459 
1460 void JSONNodeDumper::VisitUnresolvedLookupExpr(
1461     const UnresolvedLookupExpr *ULE) {
1462   JOS.attribute("usesADL", ULE->requiresADL());
1463   JOS.attribute("name", ULE->getName().getAsString());
1464 
1465   JOS.attributeArray("lookups", [this, ULE] {
1466     for (const NamedDecl *D : ULE->decls())
1467       JOS.value(createBareDeclRef(D));
1468   });
1469 }
1470 
1471 void JSONNodeDumper::VisitAddrLabelExpr(const AddrLabelExpr *ALE) {
1472   JOS.attribute("name", ALE->getLabel()->getName());
1473   JOS.attribute("labelDeclId", createPointerRepresentation(ALE->getLabel()));
1474 }
1475 
1476 void JSONNodeDumper::VisitCXXTypeidExpr(const CXXTypeidExpr *CTE) {
1477   if (CTE->isTypeOperand()) {
1478     QualType Adjusted = CTE->getTypeOperand(Ctx);
1479     QualType Unadjusted = CTE->getTypeOperandSourceInfo()->getType();
1480     JOS.attribute("typeArg", createQualType(Unadjusted));
1481     if (Adjusted != Unadjusted)
1482       JOS.attribute("adjustedTypeArg", createQualType(Adjusted));
1483   }
1484 }
1485 
1486 void JSONNodeDumper::VisitConstantExpr(const ConstantExpr *CE) {
1487   if (CE->getResultAPValueKind() != APValue::None)
1488     Visit(CE->getAPValueResult(), CE->getType());
1489 }
1490 
1491 void JSONNodeDumper::VisitInitListExpr(const InitListExpr *ILE) {
1492   if (const FieldDecl *FD = ILE->getInitializedFieldInUnion())
1493     JOS.attribute("field", createBareDeclRef(FD));
1494 }
1495 
1496 void JSONNodeDumper::VisitGenericSelectionExpr(
1497     const GenericSelectionExpr *GSE) {
1498   attributeOnlyIfTrue("resultDependent", GSE->isResultDependent());
1499 }
1500 
1501 void JSONNodeDumper::VisitCXXUnresolvedConstructExpr(
1502     const CXXUnresolvedConstructExpr *UCE) {
1503   if (UCE->getType() != UCE->getTypeAsWritten())
1504     JOS.attribute("typeAsWritten", createQualType(UCE->getTypeAsWritten()));
1505   attributeOnlyIfTrue("list", UCE->isListInitialization());
1506 }
1507 
1508 void JSONNodeDumper::VisitCXXConstructExpr(const CXXConstructExpr *CE) {
1509   CXXConstructorDecl *Ctor = CE->getConstructor();
1510   JOS.attribute("ctorType", createQualType(Ctor->getType()));
1511   attributeOnlyIfTrue("elidable", CE->isElidable());
1512   attributeOnlyIfTrue("list", CE->isListInitialization());
1513   attributeOnlyIfTrue("initializer_list", CE->isStdInitListInitialization());
1514   attributeOnlyIfTrue("zeroing", CE->requiresZeroInitialization());
1515   attributeOnlyIfTrue("hadMultipleCandidates", CE->hadMultipleCandidates());
1516   attributeOnlyIfTrue("isImmediateEscalating", CE->isImmediateEscalating());
1517 
1518   switch (CE->getConstructionKind()) {
1519   case CXXConstructionKind::Complete:
1520     JOS.attribute("constructionKind", "complete");
1521     break;
1522   case CXXConstructionKind::Delegating:
1523     JOS.attribute("constructionKind", "delegating");
1524     break;
1525   case CXXConstructionKind::NonVirtualBase:
1526     JOS.attribute("constructionKind", "non-virtual base");
1527     break;
1528   case CXXConstructionKind::VirtualBase:
1529     JOS.attribute("constructionKind", "virtual base");
1530     break;
1531   }
1532 }
1533 
1534 void JSONNodeDumper::VisitExprWithCleanups(const ExprWithCleanups *EWC) {
1535   attributeOnlyIfTrue("cleanupsHaveSideEffects",
1536                       EWC->cleanupsHaveSideEffects());
1537   if (EWC->getNumObjects()) {
1538     JOS.attributeArray("cleanups", [this, EWC] {
1539       for (const ExprWithCleanups::CleanupObject &CO : EWC->getObjects())
1540         if (auto *BD = dyn_cast<BlockDecl *>(CO)) {
1541           JOS.value(createBareDeclRef(BD));
1542         } else if (auto *CLE = dyn_cast<CompoundLiteralExpr *>(CO)) {
1543           llvm::json::Object Obj;
1544           Obj["id"] = createPointerRepresentation(CLE);
1545           Obj["kind"] = CLE->getStmtClassName();
1546           JOS.value(std::move(Obj));
1547         } else {
1548           llvm_unreachable("unexpected cleanup object type");
1549         }
1550     });
1551   }
1552 }
1553 
1554 void JSONNodeDumper::VisitCXXBindTemporaryExpr(
1555     const CXXBindTemporaryExpr *BTE) {
1556   const CXXTemporary *Temp = BTE->getTemporary();
1557   JOS.attribute("temp", createPointerRepresentation(Temp));
1558   if (const CXXDestructorDecl *Dtor = Temp->getDestructor())
1559     JOS.attribute("dtor", createBareDeclRef(Dtor));
1560 }
1561 
1562 void JSONNodeDumper::VisitMaterializeTemporaryExpr(
1563     const MaterializeTemporaryExpr *MTE) {
1564   if (const ValueDecl *VD = MTE->getExtendingDecl())
1565     JOS.attribute("extendingDecl", createBareDeclRef(VD));
1566 
1567   switch (MTE->getStorageDuration()) {
1568   case SD_Automatic:
1569     JOS.attribute("storageDuration", "automatic");
1570     break;
1571   case SD_Dynamic:
1572     JOS.attribute("storageDuration", "dynamic");
1573     break;
1574   case SD_FullExpression:
1575     JOS.attribute("storageDuration", "full expression");
1576     break;
1577   case SD_Static:
1578     JOS.attribute("storageDuration", "static");
1579     break;
1580   case SD_Thread:
1581     JOS.attribute("storageDuration", "thread");
1582     break;
1583   }
1584 
1585   attributeOnlyIfTrue("boundToLValueRef", MTE->isBoundToLvalueReference());
1586 }
1587 
1588 void JSONNodeDumper::VisitCXXDefaultArgExpr(const CXXDefaultArgExpr *Node) {
1589   attributeOnlyIfTrue("hasRewrittenInit", Node->hasRewrittenInit());
1590 }
1591 
1592 void JSONNodeDumper::VisitCXXDefaultInitExpr(const CXXDefaultInitExpr *Node) {
1593   attributeOnlyIfTrue("hasRewrittenInit", Node->hasRewrittenInit());
1594 }
1595 
1596 void JSONNodeDumper::VisitCXXDependentScopeMemberExpr(
1597     const CXXDependentScopeMemberExpr *DSME) {
1598   JOS.attribute("isArrow", DSME->isArrow());
1599   JOS.attribute("member", DSME->getMember().getAsString());
1600   attributeOnlyIfTrue("hasTemplateKeyword", DSME->hasTemplateKeyword());
1601   attributeOnlyIfTrue("hasExplicitTemplateArgs",
1602                       DSME->hasExplicitTemplateArgs());
1603 
1604   if (DSME->getNumTemplateArgs()) {
1605     JOS.attributeArray("explicitTemplateArgs", [DSME, this] {
1606       for (const TemplateArgumentLoc &TAL : DSME->template_arguments())
1607         JOS.object(
1608             [&TAL, this] { Visit(TAL.getArgument(), TAL.getSourceRange()); });
1609     });
1610   }
1611 }
1612 
1613 void JSONNodeDumper::VisitRequiresExpr(const RequiresExpr *RE) {
1614   if (!RE->isValueDependent())
1615     JOS.attribute("satisfied", RE->isSatisfied());
1616 }
1617 
1618 void JSONNodeDumper::VisitIntegerLiteral(const IntegerLiteral *IL) {
1619   llvm::SmallString<16> Buffer;
1620   IL->getValue().toString(Buffer,
1621                           /*Radix=*/10, IL->getType()->isSignedIntegerType());
1622   JOS.attribute("value", Buffer);
1623 }
1624 void JSONNodeDumper::VisitCharacterLiteral(const CharacterLiteral *CL) {
1625   // FIXME: This should probably print the character literal as a string,
1626   // rather than as a numerical value. It would be nice if the behavior matched
1627   // what we do to print a string literal; right now, it is impossible to tell
1628   // the difference between 'a' and L'a' in C from the JSON output.
1629   JOS.attribute("value", CL->getValue());
1630 }
1631 void JSONNodeDumper::VisitFixedPointLiteral(const FixedPointLiteral *FPL) {
1632   JOS.attribute("value", FPL->getValueAsString(/*Radix=*/10));
1633 }
1634 void JSONNodeDumper::VisitFloatingLiteral(const FloatingLiteral *FL) {
1635   llvm::SmallString<16> Buffer;
1636   FL->getValue().toString(Buffer);
1637   JOS.attribute("value", Buffer);
1638 }
1639 void JSONNodeDumper::VisitStringLiteral(const StringLiteral *SL) {
1640   std::string Buffer;
1641   llvm::raw_string_ostream SS(Buffer);
1642   SL->outputString(SS);
1643   JOS.attribute("value", Buffer);
1644 }
1645 void JSONNodeDumper::VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *BLE) {
1646   JOS.attribute("value", BLE->getValue());
1647 }
1648 
1649 void JSONNodeDumper::VisitIfStmt(const IfStmt *IS) {
1650   attributeOnlyIfTrue("hasInit", IS->hasInitStorage());
1651   attributeOnlyIfTrue("hasVar", IS->hasVarStorage());
1652   attributeOnlyIfTrue("hasElse", IS->hasElseStorage());
1653   attributeOnlyIfTrue("isConstexpr", IS->isConstexpr());
1654   attributeOnlyIfTrue("isConsteval", IS->isConsteval());
1655   attributeOnlyIfTrue("constevalIsNegated", IS->isNegatedConsteval());
1656 }
1657 
1658 void JSONNodeDumper::VisitSwitchStmt(const SwitchStmt *SS) {
1659   attributeOnlyIfTrue("hasInit", SS->hasInitStorage());
1660   attributeOnlyIfTrue("hasVar", SS->hasVarStorage());
1661 }
1662 void JSONNodeDumper::VisitCaseStmt(const CaseStmt *CS) {
1663   attributeOnlyIfTrue("isGNURange", CS->caseStmtIsGNURange());
1664 }
1665 
1666 void JSONNodeDumper::VisitLabelStmt(const LabelStmt *LS) {
1667   JOS.attribute("name", LS->getName());
1668   JOS.attribute("declId", createPointerRepresentation(LS->getDecl()));
1669   attributeOnlyIfTrue("sideEntry", LS->isSideEntry());
1670 }
1671 void JSONNodeDumper::VisitGotoStmt(const GotoStmt *GS) {
1672   JOS.attribute("targetLabelDeclId",
1673                 createPointerRepresentation(GS->getLabel()));
1674 }
1675 
1676 void JSONNodeDumper::VisitWhileStmt(const WhileStmt *WS) {
1677   attributeOnlyIfTrue("hasVar", WS->hasVarStorage());
1678 }
1679 
1680 void JSONNodeDumper::VisitObjCAtCatchStmt(const ObjCAtCatchStmt* OACS) {
1681   // FIXME: it would be nice for the ASTNodeTraverser would handle the catch
1682   // parameter the same way for C++ and ObjC rather. In this case, C++ gets a
1683   // null child node and ObjC gets no child node.
1684   attributeOnlyIfTrue("isCatchAll", OACS->getCatchParamDecl() == nullptr);
1685 }
1686 
1687 void JSONNodeDumper::VisitNullTemplateArgument(const TemplateArgument &TA) {
1688   JOS.attribute("isNull", true);
1689 }
1690 void JSONNodeDumper::VisitTypeTemplateArgument(const TemplateArgument &TA) {
1691   JOS.attribute("type", createQualType(TA.getAsType()));
1692 }
1693 void JSONNodeDumper::VisitDeclarationTemplateArgument(
1694     const TemplateArgument &TA) {
1695   JOS.attribute("decl", createBareDeclRef(TA.getAsDecl()));
1696 }
1697 void JSONNodeDumper::VisitNullPtrTemplateArgument(const TemplateArgument &TA) {
1698   JOS.attribute("isNullptr", true);
1699 }
1700 void JSONNodeDumper::VisitIntegralTemplateArgument(const TemplateArgument &TA) {
1701   JOS.attribute("value", TA.getAsIntegral().getSExtValue());
1702 }
1703 void JSONNodeDumper::VisitTemplateTemplateArgument(const TemplateArgument &TA) {
1704   // FIXME: cannot just call dump() on the argument, as that doesn't specify
1705   // the output format.
1706 }
1707 void JSONNodeDumper::VisitTemplateExpansionTemplateArgument(
1708     const TemplateArgument &TA) {
1709   // FIXME: cannot just call dump() on the argument, as that doesn't specify
1710   // the output format.
1711 }
1712 void JSONNodeDumper::VisitExpressionTemplateArgument(
1713     const TemplateArgument &TA) {
1714   JOS.attribute("isExpr", true);
1715 }
1716 void JSONNodeDumper::VisitPackTemplateArgument(const TemplateArgument &TA) {
1717   JOS.attribute("isPack", true);
1718 }
1719 
1720 StringRef JSONNodeDumper::getCommentCommandName(unsigned CommandID) const {
1721   if (Traits)
1722     return Traits->getCommandInfo(CommandID)->Name;
1723   if (const comments::CommandInfo *Info =
1724           comments::CommandTraits::getBuiltinCommandInfo(CommandID))
1725     return Info->Name;
1726   return "<invalid>";
1727 }
1728 
1729 void JSONNodeDumper::visitTextComment(const comments::TextComment *C,
1730                                       const comments::FullComment *) {
1731   JOS.attribute("text", C->getText());
1732 }
1733 
1734 void JSONNodeDumper::visitInlineCommandComment(
1735     const comments::InlineCommandComment *C, const comments::FullComment *) {
1736   JOS.attribute("name", getCommentCommandName(C->getCommandID()));
1737 
1738   switch (C->getRenderKind()) {
1739   case comments::InlineCommandRenderKind::Normal:
1740     JOS.attribute("renderKind", "normal");
1741     break;
1742   case comments::InlineCommandRenderKind::Bold:
1743     JOS.attribute("renderKind", "bold");
1744     break;
1745   case comments::InlineCommandRenderKind::Emphasized:
1746     JOS.attribute("renderKind", "emphasized");
1747     break;
1748   case comments::InlineCommandRenderKind::Monospaced:
1749     JOS.attribute("renderKind", "monospaced");
1750     break;
1751   case comments::InlineCommandRenderKind::Anchor:
1752     JOS.attribute("renderKind", "anchor");
1753     break;
1754   }
1755 
1756   llvm::json::Array Args;
1757   for (unsigned I = 0, E = C->getNumArgs(); I < E; ++I)
1758     Args.push_back(C->getArgText(I));
1759 
1760   if (!Args.empty())
1761     JOS.attribute("args", std::move(Args));
1762 }
1763 
1764 void JSONNodeDumper::visitHTMLStartTagComment(
1765     const comments::HTMLStartTagComment *C, const comments::FullComment *) {
1766   JOS.attribute("name", C->getTagName());
1767   attributeOnlyIfTrue("selfClosing", C->isSelfClosing());
1768   attributeOnlyIfTrue("malformed", C->isMalformed());
1769 
1770   llvm::json::Array Attrs;
1771   for (unsigned I = 0, E = C->getNumAttrs(); I < E; ++I)
1772     Attrs.push_back(
1773         {{"name", C->getAttr(I).Name}, {"value", C->getAttr(I).Value}});
1774 
1775   if (!Attrs.empty())
1776     JOS.attribute("attrs", std::move(Attrs));
1777 }
1778 
1779 void JSONNodeDumper::visitHTMLEndTagComment(
1780     const comments::HTMLEndTagComment *C, const comments::FullComment *) {
1781   JOS.attribute("name", C->getTagName());
1782 }
1783 
1784 void JSONNodeDumper::visitBlockCommandComment(
1785     const comments::BlockCommandComment *C, const comments::FullComment *) {
1786   JOS.attribute("name", getCommentCommandName(C->getCommandID()));
1787 
1788   llvm::json::Array Args;
1789   for (unsigned I = 0, E = C->getNumArgs(); I < E; ++I)
1790     Args.push_back(C->getArgText(I));
1791 
1792   if (!Args.empty())
1793     JOS.attribute("args", std::move(Args));
1794 }
1795 
1796 void JSONNodeDumper::visitParamCommandComment(
1797     const comments::ParamCommandComment *C, const comments::FullComment *FC) {
1798   switch (C->getDirection()) {
1799   case comments::ParamCommandPassDirection::In:
1800     JOS.attribute("direction", "in");
1801     break;
1802   case comments::ParamCommandPassDirection::Out:
1803     JOS.attribute("direction", "out");
1804     break;
1805   case comments::ParamCommandPassDirection::InOut:
1806     JOS.attribute("direction", "in,out");
1807     break;
1808   }
1809   attributeOnlyIfTrue("explicit", C->isDirectionExplicit());
1810 
1811   if (C->hasParamName())
1812     JOS.attribute("param", C->isParamIndexValid() ? C->getParamName(FC)
1813                                                   : C->getParamNameAsWritten());
1814 
1815   if (C->isParamIndexValid() && !C->isVarArgParam())
1816     JOS.attribute("paramIdx", C->getParamIndex());
1817 }
1818 
1819 void JSONNodeDumper::visitTParamCommandComment(
1820     const comments::TParamCommandComment *C, const comments::FullComment *FC) {
1821   if (C->hasParamName())
1822     JOS.attribute("param", C->isPositionValid() ? C->getParamName(FC)
1823                                                 : C->getParamNameAsWritten());
1824   if (C->isPositionValid()) {
1825     llvm::json::Array Positions;
1826     for (unsigned I = 0, E = C->getDepth(); I < E; ++I)
1827       Positions.push_back(C->getIndex(I));
1828 
1829     if (!Positions.empty())
1830       JOS.attribute("positions", std::move(Positions));
1831   }
1832 }
1833 
1834 void JSONNodeDumper::visitVerbatimBlockComment(
1835     const comments::VerbatimBlockComment *C, const comments::FullComment *) {
1836   JOS.attribute("name", getCommentCommandName(C->getCommandID()));
1837   JOS.attribute("closeName", C->getCloseName());
1838 }
1839 
1840 void JSONNodeDumper::visitVerbatimBlockLineComment(
1841     const comments::VerbatimBlockLineComment *C,
1842     const comments::FullComment *) {
1843   JOS.attribute("text", C->getText());
1844 }
1845 
1846 void JSONNodeDumper::visitVerbatimLineComment(
1847     const comments::VerbatimLineComment *C, const comments::FullComment *) {
1848   JOS.attribute("text", C->getText());
1849 }
1850 
1851 llvm::json::Object JSONNodeDumper::createFPOptions(FPOptionsOverride FPO) {
1852   llvm::json::Object Ret;
1853 #define OPTION(NAME, TYPE, WIDTH, PREVIOUS)                                    \
1854   if (FPO.has##NAME##Override())                                               \
1855     Ret.try_emplace(#NAME, static_cast<unsigned>(FPO.get##NAME##Override()));
1856 #include "clang/Basic/FPOptions.def"
1857   return Ret;
1858 }
1859 
1860 void JSONNodeDumper::VisitCompoundStmt(const CompoundStmt *S) {
1861   VisitStmt(S);
1862   if (S->hasStoredFPFeatures())
1863     JOS.attribute("fpoptions", createFPOptions(S->getStoredFPFeatures()));
1864 }
1865