[builtins] Introduce DeleteProperty builtin

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/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/bootstrapper.h"
 #include "src/debug/debug.h"
 #include "src/isolate-inl.h"
@@ skipping 441 matching lines @@
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, receiver,
                                      Object::ToObject(isolate, object));
   Maybe<bool> result =
       Runtime::DeleteObjectProperty(isolate, receiver, key, language_mode);
   MAYBE_RETURN(result, isolate->heap()->exception());
   return isolate->heap()->ToBoolean(result.FromJust());
 }
 
 }  // namespace
 
+RUNTIME_FUNCTION(Runtime_DeleteProperty) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(3, args.length());
+  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
+  CONVERT_SMI_ARG_CHECKED(language_mode, 2);
+  return DeleteProperty(isolate, object, key,
+                        static_cast<LanguageMode>(language_mode));
+}
 
-RUNTIME_FUNCTION(Runtime_DeleteProperty_Sloppy) {
+RUNTIME_FUNCTION(Runtime_ShrinkPropertyDictionary) {
   HandleScope scope(isolate);
   DCHECK_EQ(2, args.length());
-  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
-  return DeleteProperty(isolate, object, key, SLOPPY);
+  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, receiver, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Name, key, 1);
+  Handle<NameDictionary> dictionary(receiver->property_dictionary(), isolate);
+  Handle<NameDictionary> new_properties =
+      NameDictionary::Shrink(dictionary, key);
+  receiver->set_properties(*new_properties);
+  return Smi::kZero;
 }
 
-
-RUNTIME_FUNCTION(Runtime_DeleteProperty_Strict) {
-  HandleScope scope(isolate);
-  DCHECK_EQ(2, args.length());
-  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
-  return DeleteProperty(isolate, object, key, STRICT);
-}
-
-
 // ES6 section 12.9.3, operator in.
 RUNTIME_FUNCTION(Runtime_HasProperty) {
   HandleScope scope(isolate);
   DCHECK_EQ(2, args.length());
   CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
   CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
 
   // Check that {object} is actually a receiver.
   if (!object->IsJSReceiver()) {
     THROW_NEW_ERROR_RETURN_FAILURE(
@@ skipping 549 matching lines @@
   // While iteration alone may not have observable side-effects, calling
   // toNumber on an object will. Make sure the arg is not an array of objects.
   ElementsKind kind = JSObject::cast(*obj)->GetElementsKind();
   if (!IsFastNumberElementsKind(kind)) return isolate->heap()->ToBoolean(false);
 
   return isolate->heap()->ToBoolean(!obj->IterationHasObservableEffects());
 }
 
 }  // namespace internal
 }  // namespace v8