AuroraMiddleware/v8
1
0
Fork 0
Code Issues 2 Pull Requests Releases Wiki Activity

JSObject::NormalizeElements() handlified.

Browse Source 
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/206343002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20146 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
ishell@chromium.org 2014-03-21 08:44:40 +00:00
parent e9a315c978
commit bd2f81397c
2 changed files with 27 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

65
src/objects.cc
View File

@ -4711,70 +4711,59 @@ static Handle<SeededNumberDictionary> CopyFastElementsToDictionary(
Handle<SeededNumberDictionary> JSObject::NormalizeElements(
Handle<JSObject> object) {
CALL_HEAP_FUNCTION(object->GetIsolate(),
object->NormalizeElements(),
SeededNumberDictionary);
}
MaybeObject* JSObject::NormalizeElements() {
ASSERT(!HasExternalArrayElements());
ASSERT(!object->HasExternalArrayElements());
Isolate* isolate = object->GetIsolate();
Factory* factory = isolate->factory();
// Find the backing store.
FixedArrayBase* array = FixedArrayBase::cast(elements());
Map* old_map = array->map();
Handle<FixedArrayBase> array(FixedArrayBase::cast(object->elements()));
bool is_arguments =
(old_map == old_map->GetHeap()->sloppy_arguments_elements_map());
(array->map() == isolate->heap()->sloppy_arguments_elements_map());
if (is_arguments) {
array = FixedArrayBase::cast(FixedArray::cast(array)->get(1));
array = handle(FixedArrayBase::cast(
Handle<FixedArray>::cast(array)->get(1)));
}
if (array->IsDictionary()) return array;
if (array->IsDictionary()) return Handle<SeededNumberDictionary>::cast(array);
ASSERT(HasFastSmiOrObjectElements() ||
HasFastDoubleElements() ||
HasFastArgumentsElements());
ASSERT(object->HasFastSmiOrObjectElements() ||
object->HasFastDoubleElements() ||
object->HasFastArgumentsElements());
// Compute the effective length and allocate a new backing store.
int length = IsJSArray()
? Smi::cast(JSArray::cast(this)->length())->value()
int length = object->IsJSArray()
? Smi::cast(Handle<JSArray>::cast(object)->length())->value()
: array->length();
int old_capacity = 0;
int used_elements = 0;
GetElementsCapacityAndUsage(&old_capacity, &used_elements);
SeededNumberDictionary* dictionary;
MaybeObject* maybe_dictionary =
SeededNumberDictionary::Allocate(GetHeap(), used_elements);
if (!maybe_dictionary->To(&dictionary)) return maybe_dictionary;
object->GetElementsCapacityAndUsage(&old_capacity, &used_elements);
Handle<SeededNumberDictionary> dictionary =
factory->NewSeededNumberDictionary(used_elements);
maybe_dictionary = CopyFastElementsToDictionary(
GetIsolate(), array, length, dictionary);
if (!maybe_dictionary->To(&dictionary)) return maybe_dictionary;
dictionary = CopyFastElementsToDictionary(array, length, dictionary);
// Switch to using the dictionary as the backing storage for elements.
if (is_arguments) {
FixedArray::cast(elements())->set(1, dictionary);
FixedArray::cast(object->elements())->set(1, *dictionary);
} else {
// Set the new map first to satify the elements type assert in
// set_elements().
Map* new_map;
MaybeObject* maybe = GetElementsTransitionMap(GetIsolate(),
DICTIONARY_ELEMENTS);
if (!maybe->To(&new_map)) return maybe;
// TODO(verwaest): Replace by MigrateToMap.
set_map(new_map);
set_elements(dictionary);
Handle<Map> new_map =
JSObject::GetElementsTransitionMap(object, DICTIONARY_ELEMENTS);
JSObject::MigrateToMap(object, new_map);
object->set_elements(*dictionary);
}
old_map->GetHeap()->isolate()->counters()->elements_to_dictionary()->
Increment();
isolate->counters()->elements_to_dictionary()->Increment();
#ifdef DEBUG
if (FLAG_trace_normalization) {
PrintF("Object elements have been normalized:\n");
Print();
object->Print();
}
#endif
ASSERT(HasDictionaryElements() || HasDictionaryArgumentsElements());
ASSERT(object->HasDictionaryElements() ||
object->HasDictionaryArgumentsElements());
return dictionary;
}

2
src/objects.h
View File

@ -2608,8 +2608,6 @@ class JSObject: public JSReceiver {
static Handle<SeededNumberDictionary> NormalizeElements(
Handle<JSObject> object);
MUST_USE_RESULT MaybeObject* NormalizeElements();
// Transform slow named properties to fast variants.
static void TransformToFastProperties(Handle<JSObject> object,
int unused_property_fields);