[strong] Implement per-object restrictions behaviour of delete operator

src/objects.cc

 // Copyright 2013 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 <iomanip>
 #include <sstream>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 5449 matching lines @@
         break;
       }
       case LookupIterator::INTEGER_INDEXED_EXOTIC:
         return it.isolate()->factory()->true_value();
       case LookupIterator::DATA:
         if (is_observed) {
           old_value = it.GetDataValue();
         }
       // Fall through.
       case LookupIterator::ACCESSOR: {
-        if (!it.IsConfigurable()) {
-          // Fail if the property is not configurable.
+        if (!it.IsConfigurable() || object->map()->is_strong()) {
+          // Fail if the property is not configurable, or on a strong object.
           if (is_strict(language_mode)) {
+            if (object->map()->is_strong()) {
+              THROW_NEW_ERROR(
+                  it.isolate(),
+                  NewTypeError(MessageTemplate::kStrongDeleteProperty, object,
+                               name),
+                  Object);
+            }
             THROW_NEW_ERROR(it.isolate(),
                             NewTypeError(MessageTemplate::kStrictDeleteProperty,
                                          name, object),
                             Object);
           }
           return it.isolate()->factory()->false_value();
         }
 
         PropertyNormalizationMode mode = object->map()->is_prototype_map()
                                              ? KEEP_INOBJECT_PROPERTIES
@@ skipping 11881 matching lines @@
 void PropertyCell::SetValueWithInvalidation(Handle<PropertyCell> cell,
                                             Handle<Object> new_value) {
   if (cell->value() != *new_value) {
     cell->set_value(*new_value);
     Isolate* isolate = cell->GetIsolate();
     cell->dependent_code()->DeoptimizeDependentCodeGroup(
         isolate, DependentCode::kPropertyCellChangedGroup);
   }
 }
 } }  // namespace v8::internal