[clang][extract-api] Add enum support

Add support for enum records
- Add `EnumConstantRecord` and `EnumRecord` to store API information for
  enums
- Implement `VisitEnumDecl` in `ExtractAPIVisitor`
- Implement serializatin for enum records and `MemberOf` relationship
- Add test case for enum records
- Few other improvements

Depends on D122160

Differential Revision: https://reviews.llvm.org/D121873

1 files changed, 25 insertions, 0 deletions

diff --git a/clang/lib/ExtractAPI/API.cpp b/clang/lib/ExtractAPI/API.cpp
index 45eef3d..fd9e92c 100644
--- a/clang/lib/ExtractAPI/API.cpp
+++ b/clang/lib/ExtractAPI/API.cpp
@@ -59,6 +59,31 @@ APISet::addFunction(StringRef Name, StringRef USR, PresumedLoc Loc,
                    Comment, Fragments, SubHeading, Signature);
 }
 
+EnumConstantRecord *APISet::addEnumConstant(
+    EnumRecord *Enum, StringRef Name, StringRef USR, PresumedLoc Loc,
+    const AvailabilityInfo &Availability, const DocComment &Comment,
+    DeclarationFragments Declaration, DeclarationFragments SubHeading) {
+  auto Record =
+      APIRecordUniquePtr<EnumConstantRecord>(new (Allocator) EnumConstantRecord{
+          Name, USR, Loc, Availability, Comment, Declaration, SubHeading});
+  return Enum->Constants.emplace_back(std::move(Record)).get();
+}
+
+EnumRecord *APISet::addEnum(StringRef Name, StringRef USR, PresumedLoc Loc,
+                            const AvailabilityInfo &Availability,
+                            const DocComment &Comment,
+                            DeclarationFragments Declaration,
+                            DeclarationFragments SubHeading) {
+  auto Result = Enums.insert({Name, nullptr});
+  if (Result.second) {
+    // Create the record if it does not already exist.
+    auto Record = APIRecordUniquePtr<EnumRecord>(new (Allocator) EnumRecord{
+        Name, USR, Loc, Availability, Comment, Declaration, SubHeading});
+    Result.first->second = std::move(Record);
+  }
+  return Result.first->second.get();
+}
+
 StringRef APISet::recordUSR(const Decl *D) {
   SmallString<128> USR;
   index::generateUSRForDecl(D, USR);