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