[clang-doc] Always emit the TagType for RecordInfo

Always emit the TagType for RecordInfo in YAML output. Previously this omitted the type for "struct", considering it the default. But records in C++ don't really have a default type so always emitting this is more clear.

Emit IsTypeDef in YAML. Previously this existed only in the Representation but was never written. Additionally, adds IsTypeDef to the record merge operation which was clearing it (all RecordInfo structures are merged with am empty RecordInfo during the reduce phase).

Reviewed By: paulkirth

Differential Revision: https://reviews.llvm.org/D131739

clang-tools-extra/clang-doc/Representation.cpp

@@ -222,6 +222,7 @@ void RecordInfo::merge(RecordInfo &&Other) {
   assert(mergeable(Other));
   if (!TagType)
     TagType = Other.TagType;
+  IsTypeDef = IsTypeDef || Other.IsTypeDef;
   if (Members.empty())
     Members = std::move(Other.Members);
   if (Bases.empty())

clang-tools-extra/clang-doc/Representation.h

@@ -348,10 +348,15 @@ struct RecordInfo : public SymbolInfo {
 
   void merge(RecordInfo &&I);
 
-  TagTypeKind TagType = TagTypeKind::TTK_Struct; // Type of this record
-                                                 // (struct, class, union,
-                                                 // interface).
-  bool IsTypeDef = false; // Indicates if record was declared using typedef
+  // Type of this record (struct, class, union, interface).
+  TagTypeKind TagType = TagTypeKind::TTK_Struct;
+
+  // Indicates if the record was declared using a typedef. Things like anonymous
+  // structs in a typedef:
+  //   typedef struct { ... } foo_t;
+  // are converted into records with the typedef as the Name + this flag set.
+  bool IsTypeDef = false;
+
   llvm::SmallVector<MemberTypeInfo, 4>
       Members;                             // List of info about record members.
   llvm::SmallVector<Reference, 4> Parents; // List of base/parent records

clang-tools-extra/clang-doc/YAMLGenerator.cpp

@@ -127,7 +127,8 @@ static void SymbolInfoMapping(IO &IO, SymbolInfo &I) {
 
 static void RecordInfoMapping(IO &IO, RecordInfo &I) {
   SymbolInfoMapping(IO, I);
-  IO.mapOptional("TagType", I.TagType, clang::TagTypeKind::TTK_Struct);
+  IO.mapOptional("TagType", I.TagType);
+  IO.mapOptional("IsTypeDef", I.IsTypeDef, false);
   IO.mapOptional("Members", I.Members);
   IO.mapOptional("Bases", I.Bases);
   IO.mapOptional("Parents", I.Parents, llvm::SmallVector<Reference, 4>());

clang-tools-extra/unittests/clang-doc/MergeTest.cpp

@@ -78,6 +78,7 @@ TEST(MergeTest, mergeNamespaceInfos) {
 TEST(MergeTest, mergeRecordInfos) {
   RecordInfo One;
   One.Name = "r";
+  One.IsTypeDef = true;
   One.Namespace.emplace_back(EmptySID, "A", InfoType::IT_namespace);
 
   One.DefLoc = Location(10, llvm::SmallString<16>{"test.cpp"});
@@ -119,6 +120,7 @@ TEST(MergeTest, mergeRecordInfos) {
 
   auto Expected = std::make_unique<RecordInfo>();
   Expected->Name = "r";
+  Expected->IsTypeDef = true;
   Expected->Namespace.emplace_back(EmptySID, "A", InfoType::IT_namespace);
 
   Expected->DefLoc = Location(10, llvm::SmallString<16>{"test.cpp"});

clang-tools-extra/unittests/clang-doc/YAMLGeneratorTest.cpp

@@ -76,6 +76,7 @@ TEST(YAMLGeneratorTest, emitRecordYAML) {
   RecordInfo I;
   I.Name = "r";
   I.Path = "path/to/A";
+  I.IsTypeDef = true;
   I.Namespace.emplace_back(EmptySID, "A", InfoType::IT_namespace);
 
   I.DefLoc = Location(10, llvm::SmallString<16>{"test.cpp"});
@@ -136,6 +137,7 @@ Location:
   - LineNumber:      12
     Filename:        'test.cpp'
 TagType:         Class
+IsTypeDef:       true
 Members:
   - Type:
       Name:            'int'
@@ -154,6 +156,7 @@ Bases:
   - USR:             '0000000000000000000000000000000000000000'
     Name:            'F'
     Path:            'path/to/F'
+    TagType:         Struct
     Members:
       - Type:
           Name:            'int'