Avoid converting key to string for deleting of elements

src/runtime/runtime-object.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/arguments.h"
 #include "src/bootstrapper.h"
 #include "src/debug.h"
 #include "src/messages.h"
@@ skipping 144 matching lines @@
     if (index >= 0 && index < str->length()) {
       return GetCharAt(str, index);
     }
   }
 
   // Fall back to GetObjectProperty.
   return GetObjectProperty(isolate, receiver_obj, key_obj, language_mode);
 }
 
 
+MaybeHandle<Object> Runtime::DeleteObjectProperty(Isolate* isolate,
+                                                  Handle<JSReceiver> receiver,
+                                                  Handle<Object> key,
+                                                  LanguageMode language_mode) {
+  // Check if the given key is an array index.
+  uint32_t index = 0;
+  if (key->ToArrayIndex(&index)) {
+    return JSReceiver::DeleteElement(receiver, index, language_mode);
+  }
+
+  Handle<Name> name;
+  ASSIGN_RETURN_ON_EXCEPTION(isolate, name, ToName(isolate, key), Object);
+
+  return JSReceiver::DeletePropertyOrElement(receiver, name, language_mode);
+}
+
+
 MaybeHandle<Object> Runtime::SetObjectProperty(Isolate* isolate,
                                                Handle<Object> object,
                                                Handle<Object> key,
                                                Handle<Object> value,
                                                LanguageMode language_mode) {
   if (object->IsUndefined() || object->IsNull()) {
     THROW_NEW_ERROR(
         isolate,
         NewTypeError(MessageTemplate::kNonObjectPropertyStore, key, object),
         Object);
@@ skipping 409 matching lines @@
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, result,
       Runtime::SetObjectProperty(isolate, object, key, value, language_mode));
   return *result;
 }
 
 
 RUNTIME_FUNCTION(Runtime_DeleteProperty) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 3);
-  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, object, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Name, key, 1);
+  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, receiver, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
   CONVERT_LANGUAGE_MODE_ARG_CHECKED(language_mode, 2);
   Handle<Object> result;
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, result,
-      JSReceiver::DeletePropertyOrElement(object, key, language_mode));
+      Runtime::DeleteObjectProperty(isolate, receiver, key, language_mode));
   return *result;
 }
 
 
 static Object* HasOwnPropertyImplementation(Isolate* isolate,
                                             Handle<JSObject> object,
                                             Handle<Name> key) {
   Maybe<bool> maybe = JSReceiver::HasOwnProperty(object, key);
   if (!maybe.IsJust()) return isolate->heap()->exception();
   if (maybe.FromJust()) return isolate->heap()->true_value();
@@ skipping 804 matching lines @@
   CONVERT_PROPERTY_ATTRIBUTES_CHECKED(attrs, 3);
 
   RETURN_FAILURE_ON_EXCEPTION(
       isolate,
       JSObject::DefineAccessor(object, name, isolate->factory()->null_value(),
                                setter, attrs));
   return isolate->heap()->undefined_value();
 }
 }  // namespace internal
 }  // namespace v8