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If we are trimming the whole array, just return the empty fixed array.

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Review URL: https://chromiumcodereview.appspot.com/10911054

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12427 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
verwaest@chromium.org 2012-09-03 13:27:17 +00:00
parent 3eed540a0e
commit 996c84fb51
3 changed files with 5 additions and 3 deletions
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2
src/handles.cc
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@ -799,7 +799,7 @@ Handle<FixedArray> GetEnumPropertyKeys(Handle<JSObject> object,
Handle<FixedArray> storage =
isolate->factory()->NewFixedArray(next_enumeration);
dictionary->CopyEnumKeysTo(*storage);
storage = Handle<FixedArray>(dictionary->CopyEnumKeysTo(*storage));
ASSERT(storage->length() == object->NumberOfLocalProperties(DONT_ENUM));
return storage;
}

4
src/objects.cc
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@ -12474,7 +12474,7 @@ void Dictionary<Shape, Key>::CopyKeysTo(
}
void StringDictionary::CopyEnumKeysTo(FixedArray* storage) {
FixedArray* StringDictionary::CopyEnumKeysTo(FixedArray* storage) {
int length = storage->length();
ASSERT(length >= NumberOfEnumElements());
Heap* heap = GetHeap();
@ -12501,6 +12501,7 @@ void StringDictionary::CopyEnumKeysTo(FixedArray* storage) {
// together by shifting them to the left (maintaining the enumeration order),
// and trimming of the right side of the array.
if (properties < length) {
if (properties == 0) return heap->empty_fixed_array();
properties = 0;
for (int i = 0; i < length; ++i) {
Object* value = storage->get(i);
@ -12511,6 +12512,7 @@ void StringDictionary::CopyEnumKeysTo(FixedArray* storage) {
}
RightTrimFixedArray<FROM_MUTATOR>(heap, storage, length - properties);
}
return storage;
}

2
src/objects.h
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@ -3128,7 +3128,7 @@ class StringDictionary: public Dictionary<StringDictionaryShape, String*> {
}
// Copies enumerable keys to preallocated fixed array.
void CopyEnumKeysTo(FixedArray* storage);
FixedArray* CopyEnumKeysTo(FixedArray* storage);
static void DoGenerateNewEnumerationIndices(
Handle<StringDictionary> dictionary);