[CIR] Add VTable class name for enum type (llvm#163612)

This commit adds the RTTI support for enum in the vtable.

Issue llvm#163601

Author: moar55

clang/lib/CIR/CodeGen/CIRGenItaniumCXXABI.cpp

@@ -950,8 +950,7 @@ const char *vTableClassNameForType(const CIRGenModule &cgm, const Type *ty) {
     break;
 
   case Type::Enum:
-    cgm.errorNYI("VTableClassNameForType: Enum");
-    break;
+    return "_ZTVN10__cxxabiv116__enum_type_infoE";
 
   case Type::Record: {
     const auto *rd = cast<CXXRecordDecl>(cast<RecordType>(ty)->getDecl())

clang/test/CIR/CodeGen/throws.cpp

@@ -196,3 +196,51 @@ void throw_ext_vector_type() {
 // OGCG: store <4 x i32> %[[TMP_A]], ptr %[[EXCEPTION_ADDR]], align 16
 // OGCG: call void @__cxa_throw(ptr %[[EXCEPTION_ADDR]], ptr @_ZTIDv4_i, ptr null)
 // OGCG: unreachable
+
+void throw_enum_expr() {
+  enum Test {
+    TestA,
+    TestB
+  };
+  throw Test::TestA;
+}
+
+// CIR: %[[EXCEPTION_ADDR:.*]] = cir.alloc.exception 4 -> !cir.ptr<!u32i>
+// CIR: %[[EXCEPTION_VALUE:.*]] = cir.const #cir.int<0> : !u32i
+// CIR: cir.store{{.*}} %[[EXCEPTION_VALUE]], %[[EXCEPTION_ADDR]] : !u32i, !cir.ptr<!u32i>
+// CIR: cir.throw %[[EXCEPTION_ADDR]] : !cir.ptr<!u32i>, @_ZTIZ15throw_enum_exprvE4Test
+// CIR: cir.unreachable
+
+// LLVM: %[[EXCEPTION_ADDR:.*]] = call ptr @__cxa_allocate_exception(i64 4)
+// LLVM: store i32 0, ptr %[[EXCEPTION_ADDR]], align 16
+// LLVM: call void @__cxa_throw(ptr %[[EXCEPTION_ADDR]], ptr @_ZTIZ15throw_enum_exprvE4Test, ptr null)
+// LLVM: unreachable
+
+// OGCG: %[[EXCEPTION_ADDR:.*]] = call ptr @__cxa_allocate_exception(i64 4)
+// OGCG: store i32 0, ptr %[[EXCEPTION_ADDR]], align 16
+// OGCG: call void @__cxa_throw(ptr %[[EXCEPTION_ADDR]], ptr @_ZTIZ15throw_enum_exprvE4Test, ptr null)
+// OGCG: unreachable
+
+void throw_enum_class_expr() {
+  enum class Test {
+    TestA,
+    TestB
+  };
+  throw Test::TestA;
+}
+
+// CIR: %[[EXCEPTION_ADDR:.*]] = cir.alloc.exception 4 -> !cir.ptr<!s32i>
+// CIR: %[[EXCEPTION_VALUE:.*]] = cir.const #cir.int<0> : !s32i
+// CIR: cir.store{{.*}} %[[EXCEPTION_VALUE]], %[[EXCEPTION_ADDR]] : !s32i, !cir.ptr<!s32i>
+// CIR: cir.throw %[[EXCEPTION_ADDR]] : !cir.ptr<!s32i>, @_ZTIZ21throw_enum_class_exprvE4Test
+// CIR: cir.unreachable
+
+// LLVM: %[[EXCEPTION_ADDR:.*]] = call ptr @__cxa_allocate_exception(i64 4)
+// LLVM: store i32 0, ptr %[[EXCEPTION_ADDR]], align 16
+// LLVM: call void @__cxa_throw(ptr %[[EXCEPTION_ADDR]], ptr @_ZTIZ21throw_enum_class_exprvE4Test, ptr null)
+// LLVM: unreachable
+
+// OGCG: %[[EXCEPTION_ADDR:.*]] = call ptr @__cxa_allocate_exception(i64 4)
+// OGCG: store i32 0, ptr %[[EXCEPTION_ADDR]], align 16
+// OGCG: call void @__cxa_throw(ptr %[[EXCEPTION_ADDR]], ptr @_ZTIZ21throw_enum_class_exprvE4Test, ptr null)
+// OGCG: unreachable