[clang-doc] remove FullName from serialization (#166595)

An Info's FullName was not being used anywhere in clang-doc. It seems to
have been superseded by other types like QualName. Removing FullName
also orphans getRecordPrototype, which constructs a record's full
declaration (template<...> class ...). There are better ways to
construct this documentation in templates.

Fixes #143086

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

@@ -468,7 +468,6 @@ static void insertArray(Object &Obj, json::Value &Array, StringRef Key) {
 static void serializeInfo(const RecordInfo &I, json::Object &Obj,
                           const std::optional<StringRef> &RepositoryUrl) {
   serializeCommonAttributes(I, Obj, RepositoryUrl);
-  Obj["FullName"] = I.FullName;
   Obj["TagType"] = getTagType(I.TagType);
   Obj["IsTypedef"] = I.IsTypeDef;
   Obj["MangledName"] = I.MangledName;

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

@@ -437,10 +437,6 @@ struct FunctionInfo : public SymbolInfo {
   // (AS_public = 0, AS_protected = 1, AS_private = 2, AS_none = 3)
   AccessSpecifier Access = AccessSpecifier::AS_public;
 
-  // Full qualified name of this function, including namespaces and template
-  // specializations.
-  SmallString<16> FullName;
-
   // Function Prototype
   SmallString<256> Prototype;
 
@@ -460,10 +456,6 @@ struct RecordInfo : public SymbolInfo {
   // Type of this record (struct, class, union, interface).
   TagTypeKind TagType = TagTypeKind::Struct;
 
-  // Full qualified name of this record, including namespaces and template
-  // specializations.
-  SmallString<16> FullName;
-
   // When present, this record is a template or specialization.
   std::optional<TemplateInfo> Template;
 

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

@@ -178,55 +178,6 @@ static llvm::SmallString<16> getTypeAlias(const TypeAliasDecl *Alias) {
   return Result;
 }
 
-// extract full syntax for record declaration
-static llvm::SmallString<16> getRecordPrototype(const CXXRecordDecl *CXXRD) {
-  llvm::SmallString<16> Result;
-  LangOptions LangOpts;
-  PrintingPolicy Policy(LangOpts);
-  Policy.SuppressTagKeyword = false;
-  Policy.FullyQualifiedName = true;
-  Policy.IncludeNewlines = false;
-  llvm::raw_svector_ostream OS(Result);
-  if (const auto *TD = CXXRD->getDescribedClassTemplate()) {
-    OS << "template <";
-    bool FirstParam = true;
-    for (const auto *Param : *TD->getTemplateParameters()) {
-      if (!FirstParam)
-        OS << ", ";
-      Param->print(OS, Policy);
-      FirstParam = false;
-    }
-    OS << ">\n";
-  }
-
-  if (CXXRD->isStruct())
-    OS << "struct ";
-  else if (CXXRD->isClass())
-    OS << "class ";
-  else if (CXXRD->isUnion())
-    OS << "union ";
-
-  OS << CXXRD->getNameAsString();
-
-  // We need to make sure we have a good enough declaration to check. In the
-  // case where the class is a forward declaration, we'll fail assertions  in
-  // DeclCXX.
-  if (CXXRD->isCompleteDefinition() && CXXRD->getNumBases() > 0) {
-    OS << " : ";
-    bool FirstBase = true;
-    for (const auto &Base : CXXRD->bases()) {
-      if (!FirstBase)
-        OS << ", ";
-      if (Base.isVirtual())
-        OS << "virtual ";
-      OS << getAccessSpelling(Base.getAccessSpecifier()) << " ";
-      OS << Base.getType().getAsString(Policy);
-      FirstBase = false;
-    }
-  }
-  return Result;
-}
-
 // A function to extract the appropriate relative path for a given info's
 // documentation. The path returned is a composite of the parent namespaces.
 //
@@ -1033,7 +984,6 @@ emitInfo(const RecordDecl *D, const FullComment *FC, Location Loc,
   parseFields(*RI, D, PublicOnly);
 
   if (const auto *C = dyn_cast<CXXRecordDecl>(D)) {
-    RI->FullName = getRecordPrototype(C);
     if (const TypedefNameDecl *TD = C->getTypedefNameForAnonDecl()) {
       RI->Name = TD->getNameAsString();
       RI->IsTypeDef = true;

clang-tools-extra/test/clang-doc/json/class.cpp

@@ -124,8 +124,6 @@ protected:
 // CHECK-NEXT:        }
 // CHECK-NEXT:      }
 // CHECK-NEXT:    ],
-// COM:           FIXME: FullName is not emitted correctly.
-// CHECK-NEXT:    "FullName": "",
 // CHECK-NEXT:    "HasEnums": true,
 // CHECK-NEXT:    "HasPublicFunctions": true,
 // CHECK-NEXT:    "HasPublicMembers": true,

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

@@ -16,8 +16,6 @@ static std::unique_ptr<Generator> getJSONGenerator() {
 TEST(JSONGeneratorTest, emitRecordJSON) {
   RecordInfo I;
   I.Name = "Foo";
-  // FIXME: FullName is not emitted correctly.
-  I.FullName = "";
   I.IsTypeDef = false;
   I.Namespace.emplace_back(EmptySID, "GlobalNamespace", InfoType::IT_namespace);
   I.Path = "GlobalNamespace";
@@ -64,7 +62,6 @@ TEST(JSONGeneratorTest, emitRecordJSON) {
     {
       "Access": "public",
       "End": true,
-      "FullName": "",
       "HasPublicFunctions": true,
       "HasPublicMembers": true,
       "InfoType": "record",
@@ -115,7 +112,6 @@ TEST(JSONGeneratorTest, emitRecordJSON) {
       "USR": "0000000000000000000000000000000000000000"
     }
   ],
-  "FullName": "",
   "HasEnums": true,
   "HasPublicFunctions": true,
   "HasRecords": true,