Handlify callers of Object::GetElement.

src/json-stringifier.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 637 matching lines @@
       PropertyDetails details = map->instance_descriptors()->GetDetails(i);
       if (details.IsDontEnum()) continue;
       Handle<Object> property;
       if (details.type() == FIELD && *map == object->map()) {
         property = Handle<Object>(
                        object->RawFastPropertyAt(
                            map->instance_descriptors()->GetFieldIndex(i)),
                        isolate_);
       } else {
         property = GetProperty(isolate_, object, key);
-        if (property.is_null()) return EXCEPTION;
+        RETURN_IF_EMPTY_HANDLE_VALUE(isolate_, property, EXCEPTION);
       }
       Result result = SerializeProperty(property, comma, key);
       if (!comma && result == SUCCESS) comma = true;
       if (result >= EXCEPTION) return result;
     }
   } else {
     bool has_exception = false;
     Handle<FixedArray> contents =
         GetKeysInFixedArrayFor(object, LOCAL_ONLY, &has_exception);
     if (has_exception) return EXCEPTION;
@@ skipping 11 matching lines @@
         uint32_t index;
         if (key->IsSmi()) {
           property = Object::GetElement(
               isolate_, object, Smi::cast(key)->value());
         } else if (key_handle->AsArrayIndex(&index)) {
           property = Object::GetElement(isolate_, object, index);
         } else {
           property = GetProperty(isolate_, object, key_handle);
         }
       }
-      if (property.is_null()) return EXCEPTION;
+      RETURN_IF_EMPTY_HANDLE_VALUE(isolate_, property, EXCEPTION);
       Result result = SerializeProperty(property, comma, key_handle);
       if (!comma && result == SUCCESS) comma = true;
       if (result >= EXCEPTION) return result;
     }
   }
 
   Append('}');
   StackPop();
   current_part_ = handle_scope.CloseAndEscape(current_part_);
   return SUCCESS;
@@ skipping 146 matching lines @@
       SerializeString_<false, uint8_t>(object);
     } else {
       SerializeString_<false, uc16>(object);
     }
   }
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_JSON_STRINGIFIER_H_