2937 void JSObject::UpdatePrototypeUserRegistration(Handle<Map> old_map,  in UpdatePrototypeUserRegistration()  argument
2940   DCHECK(old_map->is_prototype_map());  in UpdatePrototypeUserRegistration()
2942   bool was_registered = JSObject::UnregisterPrototypeUser(old_map, isolate);  in UpdatePrototypeUserRegistration()
2943   new_map->set_prototype_info(old_map->prototype_info(), kReleaseStore);  in UpdatePrototypeUserRegistration()
2944   old_map->set_prototype_info(Smi::zero(), kReleaseStore);  in UpdatePrototypeUserRegistration()
2948            reinterpret_cast<void*>(old_map->ptr()),  in UpdatePrototypeUserRegistration()
2963 void JSObject::NotifyMapChange(Handle<Map> old_map, Handle<Map> new_map,  in NotifyMapChange()  argument
2965   if (!old_map->is_prototype_map()) return;  in NotifyMapChange()
2967   InvalidatePrototypeChains(*old_map);  in NotifyMapChange()
2974   UpdatePrototypeUserRegistration(old_map, new_map, isolate);  in NotifyMapChange()
2996   Handle<Map> old_map(object->map(), isolate);  in MigrateFastToFast()  local
2998   if (new_map->GetBackPointer(isolate) == *old_map) {  in MigrateFastToFast()
3000     if (old_map->NumberOfOwnDescriptors() ==  in MigrateFastToFast()
3064   if (!old_map->InstancesNeedRewriting(*new_map, number_of_fields, inobject,  in MigrateFastToFast()
3080       old_map->instance_descriptors(isolate), isolate);  in MigrateFastToFast()
3083   int old_nof = old_map->NumberOfOwnDescriptors();  in MigrateFastToFast()
3115       FieldIndex index = FieldIndex::ForDescriptor(isolate, *old_map, i);  in MigrateFastToFast()
3169   int old_instance_size = old_map->instance_size();  in MigrateFastToFast()
3315   Handle<Map> old_map(object->map(isolate), isolate);  in MigrateToMap()  local
3316   NotifyMapChange(old_map, new_map, isolate);  in MigrateToMap()
3318   if (old_map->is_dictionary_map()) {  in MigrateToMap()
3327     if (old_map->is_prototype_map()) {  in MigrateToMap()
3328       DCHECK(!old_map->is_stable());  in MigrateToMap()
3331       DCHECK(old_map->owns_descriptors());  in MigrateToMap()
3335       old_map->set_owns_descriptors(false);  in MigrateToMap()
3336       DCHECK(old_map->is_abandoned_prototype_map());  in MigrateToMap()
3339                 TransitionsAccessor(isolate, *old_map).NumberOfTransitions());  in MigrateToMap()
3341       DCHECK(object->map(isolate) != *old_map);  in MigrateToMap()
3358   Handle<Map> old_map = Handle<Map>(object->map(), isolate);  in ForceSetPrototype()  local
3359   Handle<Map> new_map = Map::Copy(isolate, old_map, "ForceSetPrototype");  in ForceSetPrototype()
3731   Handle<Map> old_map(object->map(), isolate);  in MigrateSlowToFast()  local
3733   int inobject_props = old_map->GetInObjectProperties();  in MigrateSlowToFast()
3736   Handle<Map> new_map = Map::CopyDropDescriptors(isolate, old_map);  in MigrateSlowToFast()
3743   NotifyMapChange(old_map, new_map, isolate);  in MigrateSlowToFast()
3755       LOG(isolate, MapEvent("SlowToFast", old_map, new_map, reason));  in MigrateSlowToFast()
3777       IsTransitionableFastElementsKind(old_map->elements_kind());  in MigrateSlowToFast()
3866     LOG(isolate, MapEvent("SlowToFast", old_map, new_map, reason));  in MigrateSlowToFast()
4320   Handle<Map> old_map(object->map(), isolate);  in PreventExtensionsWithTransition()  local
4321   old_map = Map::Update(isolate, old_map);  in PreventExtensionsWithTransition()
4324       TransitionsAccessor::SearchSpecial(isolate, old_map, *transition_marker);  in PreventExtensionsWithTransition()
4335   } else if (TransitionsAccessor::CanHaveMoreTransitions(isolate, old_map)) {  in PreventExtensionsWithTransition()
4338         isolate, old_map, attrs, transition_marker, "CopyForPreventExtensions");  in PreventExtensionsWithTransition()
4344     DCHECK(old_map->is_dictionary_map() || !old_map->is_prototype_map());  in PreventExtensionsWithTransition()
4357           IsStringWrapperElementsKind(old_map->elements_kind())  in PreventExtensionsWithTransition()