Add CheckCast().

runtime/src/main/cpp/Memory.cpp

@@ -1,6 +1,7 @@
 #include <stdlib.h>
 
 #include "Assert.h"
+#include "Exceptions.h"
 #include "Memory.h"
 
 void FreeObject(ContainerHeader* header) {
@@ -105,6 +106,13 @@ int IsInstance(const ObjHeader* obj, const TypeInfo* type_info) {
   return obj_type_info != nullptr;
 }
 
+void CheckInstance(const ObjHeader* obj, const TypeInfo* type_info) {
+  if (IsInstance(obj, type_info)) {
+    return;
+  }
+  ThrowClassCastException();
+}
+
 #ifdef __cplusplus
 }
 #endif

runtime/src/main/cpp/Memory.h

@@ -267,6 +267,7 @@ void* AllocInstance(const TypeInfo* type_info, PlacementHint hint);
 void* AllocArrayInstance(
     const TypeInfo* type_info, PlacementHint hint, uint32_t elements);
 int IsInstance(const ObjHeader* obj, const TypeInfo* type_info);
+void CheckCast(const ObjHeader* obj, const TypeInfo* type_info);
 
 #ifdef __cplusplus
 }