Immediatelly promote marked objects

test/cctest/heap/test-heap.cc

Index: test/cctest/heap/test-heap.cc
diff --git a/test/cctest/heap/test-heap.cc b/test/cctest/heap/test-heap.cc
index 426eb63a74da0c8383323f0f0534b5361b432522..e0252781cffae1cdd215c88c59e325e64f02fd9d 100644
--- a/test/cctest/heap/test-heap.cc
+++ b/test/cctest/heap/test-heap.cc
@@ -711,6 +711,44 @@ TEST(DeleteWeakGlobalHandle) {
   CHECK(WeakPointerCleared);
 }
 
+TEST(DoNotPromoteWhiteObjectsOnScavenge) {
+  CcTest::InitializeVM();
+  Isolate* isolate = CcTest::i_isolate();
+  Heap* heap = isolate->heap();
+  Factory* factory = isolate->factory();
+
+  HandleScope scope(isolate);
+  Handle<Object> white = factory->NewStringFromStaticChars("white");
+
+  CHECK(Marking::IsWhite(Marking::MarkBitFrom(HeapObject::cast(*white))));
+
+  heap->CollectGarbage(NEW_SPACE);
+
+  CHECK(heap->InNewSpace(*white));
+}
+
+TEST(PromoteGreyOrBlackObjectsOnScavenge) {
+  CcTest::InitializeVM();
+  Isolate* isolate = CcTest::i_isolate();
+  Heap* heap = isolate->heap();
+  Factory* factory = isolate->factory();
+
+  HandleScope scope(isolate);
+  Handle<Object> marked = factory->NewStringFromStaticChars("marked");
+
+  IncrementalMarking* marking = heap->incremental_marking();
+  marking->Stop();
+  heap->StartIncrementalMarking();
+  while (Marking::IsWhite(Marking::MarkBitFrom(HeapObject::cast(*marked)))) {
+    marking->Step(MB, IncrementalMarking::NO_GC_VIA_STACK_GUARD,
+                  IncrementalMarking::FORCE_MARKING,
+                  IncrementalMarking::DO_NOT_FORCE_COMPLETION);
+  }
+
+  heap->CollectGarbage(NEW_SPACE);
+
+  CHECK(!heap->InNewSpace(*marked));
+}
 
 TEST(BytecodeArray) {
   static const uint8_t kRawBytes[] = {0xc3, 0x7e, 0xa5, 0x5a};