Add IsClassPolymorphic function

Author: Vipul-Cariappa

include/clang/Interpreter/CppInterOp.h

@@ -210,6 +210,10 @@ namespace Cpp {
   /// Checks if the scope is a class or not.
   CPPINTEROP_API bool IsClass(TCppScope_t scope);
 
+  /// Checks if the klass polymorphic.
+  /// which means that the class contains or inherits a virtual function
+  CPPINTEROP_API bool IsClassPolymorphic(TCppScope_t klass);
+
   // See TClingClassInfo::IsLoaded
   /// Checks if the class definition is present, or not. Performs a
   /// template instantiation if necessary.

lib/Interpreter/CppInterOp.cpp

@@ -208,6 +208,14 @@ namespace Cpp {
     return isa<CXXRecordDecl>(D);
   }
 
+  bool IsClassPolymorphic(TCppScope_t klass) {
+    Decl* D = static_cast<Decl*>(klass);
+    if (auto* CXXRD = llvm::dyn_cast<CXXRecordDecl>(D))
+      if (auto* CXXRDD = CXXRD->getDefinition())
+        return CXXRDD->isPolymorphic();
+    return false;
+  }
+
   static SourceLocation GetValidSLoc(Sema& semaRef) {
     auto& SM = semaRef.getSourceManager();
     return SM.getLocForStartOfFile(SM.getMainFileID());

unittests/CppInterOp/ScopeReflectionTest.cpp

@@ -91,6 +91,28 @@ TEST(ScopeReflectionTest, IsClass) {
   EXPECT_FALSE(Cpp::IsClass(Decls[2]));
 }
 
+TEST(ScopeReflectionTest, IsClassPolymorphic) {
+  std::vector<Decl*> Decls;
+  GetAllTopLevelDecls(R"(
+    namespace N {}
+    
+    class C{};
+    
+    class C2 {
+    public:
+      virtual ~C2() {}
+    };
+    
+    int I;
+  )",
+                      Decls);
+
+  EXPECT_FALSE(Cpp::IsClassPolymorphic(Decls[0]));
+  EXPECT_FALSE(Cpp::IsClassPolymorphic(Decls[1]));
+  EXPECT_TRUE(Cpp::IsClassPolymorphic(Decls[2]));
+  EXPECT_FALSE(Cpp::IsClassPolymorphic(Decls[3]));
+}
+
 TEST(ScopeReflectionTest, IsComplete) {
   std::vector<Decl*> Decls;
   std::string code = R"(