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[web snapshot] Faster DescriptorArray setup

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Use DescriptorArray::Set instead of Append to avoid resorting the
descriptors for every newly added property

Bug: v8:11525
Change-Id: Id6d113f6218e095125256a8c7c8cfb28c8b41ae5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3415391
Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78769}
This commit is contained in:
Camillo Bruni 2022-01-25 16:30:00 +01:00 committed by V8 LUCI CQ
parent f49f6bb571
commit 9b2b6140f3
1 changed files with 8 additions and 6 deletions
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14
src/web-snapshot/web-snapshot.cc
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@ -1295,8 +1295,9 @@ void WebSnapshotDeserializer::DeserializeMaps() {
}
Handle<DescriptorArray> descriptors =
isolate_->factory()->NewDescriptorArray(0, property_count);
for (uint32_t p = 0; p < property_count; ++p) {
isolate_->factory()->NewDescriptorArray(property_count, 0);
// for (uint32_t p = 0; p < property_count; ++p) {
for (InternalIndex i : InternalIndex::Range(property_count)) {
PropertyAttributes attributes = PropertyAttributes::NONE;
if (has_custom_property_attributes) {
uint32_t flags;
@ -1311,11 +1312,12 @@ void WebSnapshotDeserializer::DeserializeMaps() {
// Use the "none" representation until we see the first object having this
// map. At that point, modify the representation.
Descriptor desc =
Descriptor::DataField(isolate_, key, static_cast<int>(p), attributes,
Representation::None());
descriptors->Append(&desc);
Descriptor desc = Descriptor::DataField(
isolate_, key, i.as_int(), attributes, Representation::None());
descriptors->Set(i, &desc);
}
DCHECK_EQ(descriptors->number_of_descriptors(), property_count);
descriptors->Sort();
Handle<Map> map = isolate_->factory()->NewMap(
JS_OBJECT_TYPE, JSObject::kHeaderSize * kTaggedSize, HOLEY_ELEMENTS, 0);