}
-void Map::ConnectElementsTransition(Handle<Map> parent, Handle<Map> child) {
- Isolate* isolate = parent->GetIsolate();
- Handle<Name> name = isolate->factory()->elements_transition_symbol();
- ConnectTransition(parent, child, name, SPECIAL_TRANSITION);
-}
-
-
void JSObject::MigrateToMap(Handle<JSObject> object, Handle<Map> new_map,
int expected_additional_properties) {
if (object->map() == *new_map) return;
}
}
- return TransitionElementsToSlow(map, to_kind);
-}
-
-
-Handle<Map> Map::TransitionElementsToSlow(Handle<Map> map,
- ElementsKind to_kind) {
- ElementsKind from_kind = map->elements_kind();
-
- if (from_kind == to_kind) {
- return map;
- }
-
- bool allow_store_transition =
- // Only remember the map transition if there is not an already existing
- // non-matching element transition.
- !map->IsUndefined() && !map->is_dictionary_map() &&
- IsTransitionElementsKind(from_kind);
-
+ DCHECK(!map->IsUndefined());
+ bool allow_store_transition = IsTransitionElementsKind(from_kind);
// Only store fast element maps in ascending generality.
if (IsFastElementsKind(to_kind)) {
allow_store_transition &=
DCHECK(transition_map->has_dictionary_elements());
DCHECK(!transition_map->is_extensible());
JSObject::MigrateToMap(object, transition_map);
- } else if (object->HasFastProperties() &&
- TransitionArray::CanHaveMoreTransitions(old_map)) {
+ } else if (TransitionArray::CanHaveMoreTransitions(old_map)) {
// Create a new descriptor array with the appropriate property attributes
Handle<Map> new_map = Map::CopyForPreventExtensions(
old_map, attrs, transition_marker, "CopyForPreventExtensions");
if (transition != NULL) {
new_map = handle(transition, isolate);
DCHECK(new_map->is_observed());
- } else if (object->HasFastProperties() &&
- TransitionArray::CanHaveMoreTransitions(old_map)) {
+ } else if (TransitionArray::CanHaveMoreTransitions(old_map)) {
new_map = Map::CopyForObserved(old_map);
} else {
new_map = Map::Copy(old_map, "SlowObserved");
Handle<Map> new_map = CopyForTransition(map, "CopyAsElementsKind");
new_map->set_elements_kind(kind);
- ConnectElementsTransition(map, new_map);
-
+ Isolate* isolate = map->GetIsolate();
+ Handle<Name> name = isolate->factory()->elements_transition_symbol();
+ ConnectTransition(map, new_map, name, SPECIAL_TRANSITION);
return new_map;
}
Handle<LayoutDescriptor> layout_descriptor);
private:
- static void ConnectElementsTransition(Handle<Map> parent, Handle<Map> child);
static void ConnectTransition(Handle<Map> parent, Handle<Map> child,
Handle<Name> name, SimpleTransitionFlag flag);
// the descriptor array.
inline void NotifyLeafMapLayoutChange();
- static Handle<Map> TransitionElementsToSlow(Handle<Map> object,
- ElementsKind to_kind);
-
void DeprecateTransitionTree();
bool DeprecateTarget(PropertyKind kind, Name* key,
PropertyAttributes attributes,