diff --git a/test/cctest/test-heap.cc b/test/cctest/test-heap.cc index 7015a1ee62..eb5f3c605e 100644 --- a/test/cctest/test-heap.cc +++ b/test/cctest/test-heap.cc @@ -1606,4 +1606,23 @@ TEST(PrototypeTransitionClearing) { CHECK(trans->get(j + Map::kProtoTransitionMapOffset)->IsMap()); CHECK(trans->get(j + Map::kProtoTransitionPrototypeOffset)->IsJSObject()); } + + // Make sure next prototype is placed on an old-space evacuation candidate. + Handle prototype; + PagedSpace* space = HEAP->old_pointer_space(); + do { + prototype = FACTORY->NewJSArray(32 * KB, TENURED); + } while (space->FirstPage() == space->LastPage() || + !space->LastPage()->Contains(prototype->address())); + + // Add a prototype on an evacuation candidate and verify that transition + // clearing correctly records slots in prototype transition array. + i::FLAG_always_compact = true; + Handle map(baseObject->map()); + CHECK(!space->LastPage()->Contains(map->prototype_transitions()->address())); + CHECK(space->LastPage()->Contains(prototype->address())); + baseObject->SetPrototype(*prototype, false)->ToObjectChecked(); + CHECK(map->GetPrototypeTransition(*prototype)->IsMap()); + HEAP->CollectAllGarbage(Heap::kNoGCFlags); + CHECK(map->GetPrototypeTransition(*prototype)->IsMap()); }