[clang] [libcxx] [Clang] Add __builtin_invoke and use it in libc++ (PR #116709)

[Shafik Yaghmour via cfe-commits]

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@@ -1547,6 +1547,58 @@ ExprResult Sema::ActOnTypeTrait(TypeTrait Kind, SourceLocation KWLoc,
   return BuildTypeTrait(Kind, KWLoc, ConvertedArgs, RParenLoc);
 }
 
+bool Sema::BuiltinIsBaseOf(SourceLocation RhsTLoc, QualType LhsT,
+                           QualType RhsT) {
+  // C++0x [meta.rel]p2
+  // Base is a base class of Derived without regard to cv-qualifiers or
+  // Base and Derived are not unions and name the same class type without
+  // regard to cv-qualifiers.
+
+  const RecordType *lhsRecord = LhsT->getAs<RecordType>();
+  const RecordType *rhsRecord = RhsT->getAs<RecordType>();
+  if (!rhsRecord || !lhsRecord) {
+    const ObjCObjectType *LHSObjTy = LhsT->getAs<ObjCObjectType>();
+    const ObjCObjectType *RHSObjTy = RhsT->getAs<ObjCObjectType>();
+    if (!LHSObjTy || !RHSObjTy)
+      return false;
+
+    ObjCInterfaceDecl *BaseInterface = LHSObjTy->getInterface();
+    ObjCInterfaceDecl *DerivedInterface = RHSObjTy->getInterface();
+    if (!BaseInterface || !DerivedInterface)
+      return false;
+
+    if (RequireCompleteType(RhsTLoc, RhsT,
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shafik wrote:

I don't think this diagnostic is tested.

https://github.com/llvm/llvm-project/pull/116709