Revert of Reland "Filter invalid slots out from the SlotsBuffer after...

Revert of Reland "Filter invalid slots out from the SlotsBuffer after marking." (patchset #2 id:2 of https://codereview.chromium.org/1032833002/)

Reason for revert:
Reverting risky GC changes that block v8 roll.

Original issue's description:
> Reland "Filter invalid slots out from the SlotsBuffer after marking."
>
> > There are two reasons that could cause invalid slots appearance in SlotsBuffer:
> > 1) If GC trims "tail" of an array for which it has already recorded a slots and then migrate another object to the "tail".
> > 2) Tagged slot could become a double slot after migrating of an object to another map with "shifted" fields (for example as a result of generalizing immutable data property to a data field).
>
> > This CL also adds useful machinery that helps triggering incremental write barriers.
>
> > BUG=chromium:454297
> > LOG=Y
>
> NOTRY=true
>
> Committed: https://crrev.com/f86aadd1d45c756467dff8e08a055b462d7a060b
> Cr-Commit-Position: refs/heads/master@{#27433}

TBR=machenbach@chromium.org,ulan@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1041593002

Cr-Commit-Position: refs/heads/master@{#27491}

src/flag-definitions.h

@@ -767,11 +767,6 @@ DEFINE_BOOL(stress_compaction, false,
             "stress the GC compactor to flush out bugs (implies "
             "--force_marking_deque_overflows)")
 
-DEFINE_BOOL(manual_evacuation_candidates_selection, false,
-            "Test mode only flag. It allows an unit test to select evacuation "
-            "candidates pages (requires --stress_compaction).")
-
-
 //
 // Dev shell flags
 //

src/heap/mark-compact.cc

@@ -287,60 +287,6 @@ bool MarkCompactCollector::StartCompaction(CompactionMode mode) {
 }
 
 
-void MarkCompactCollector::ClearInvalidSlotsBufferEntries(PagedSpace* space) {
-  PageIterator it(space);
-  while (it.has_next()) {
-    Page* p = it.next();
-    SlotsBuffer::RemoveInvalidSlots(heap_, p->slots_buffer());
-  }
-}
-
-
-void MarkCompactCollector::ClearInvalidStoreAndSlotsBufferEntries() {
-  heap_->store_buffer()->ClearInvalidStoreBufferEntries();
-
-  ClearInvalidSlotsBufferEntries(heap_->old_pointer_space());
-  ClearInvalidSlotsBufferEntries(heap_->old_data_space());
-  ClearInvalidSlotsBufferEntries(heap_->code_space());
-  ClearInvalidSlotsBufferEntries(heap_->cell_space());
-  ClearInvalidSlotsBufferEntries(heap_->map_space());
-
-  LargeObjectIterator it(heap_->lo_space());
-  for (HeapObject* object = it.Next(); object != NULL; object = it.Next()) {
-    MemoryChunk* chunk = MemoryChunk::FromAddress(object->address());
-    SlotsBuffer::RemoveInvalidSlots(heap_, chunk->slots_buffer());
-  }
-}
-
-
-#ifdef VERIFY_HEAP
-static void VerifyValidSlotsBufferEntries(Heap* heap, PagedSpace* space) {
-  PageIterator it(space);
-  while (it.has_next()) {
-    Page* p = it.next();
-    SlotsBuffer::VerifySlots(heap, p->slots_buffer());
-  }
-}
-
-
-static void VerifyValidStoreAndSlotsBufferEntries(Heap* heap) {
-  heap->store_buffer()->VerifyValidStoreBufferEntries();
-
-  VerifyValidSlotsBufferEntries(heap, heap->old_pointer_space());
-  VerifyValidSlotsBufferEntries(heap, heap->old_data_space());
-  VerifyValidSlotsBufferEntries(heap, heap->code_space());
-  VerifyValidSlotsBufferEntries(heap, heap->cell_space());
-  VerifyValidSlotsBufferEntries(heap, heap->map_space());
-
-  LargeObjectIterator it(heap->lo_space());
-  for (HeapObject* object = it.Next(); object != NULL; object = it.Next()) {
-    MemoryChunk* chunk = MemoryChunk::FromAddress(object->address());
-    SlotsBuffer::VerifySlots(heap, chunk->slots_buffer());
-  }
-}
-#endif
-
-
 void MarkCompactCollector::CollectGarbage() {
   // Make sure that Prepare() has been called. The individual steps below will
   // update the state as they proceed.
@@ -366,11 +312,11 @@ void MarkCompactCollector::CollectGarbage() {
   }
 #endif
 
-  ClearInvalidStoreAndSlotsBufferEntries();
+  heap_->store_buffer()->ClearInvalidStoreBufferEntries();
 
 #ifdef VERIFY_HEAP
   if (FLAG_verify_heap) {
-    VerifyValidStoreAndSlotsBufferEntries(heap_);
+    heap_->store_buffer()->VerifyValidStoreBufferEntries();
   }
 #endif
 
@@ -777,7 +723,6 @@ void MarkCompactCollector::CollectEvacuationCandidates(PagedSpace* space) {
 
   int count = 0;
   int fragmentation = 0;
-  int page_number = 0;
   Candidate* least = NULL;
 
   PageIterator it(space);
@@ -792,16 +737,9 @@ void MarkCompactCollector::CollectEvacuationCandidates(PagedSpace* space) {
     CHECK(p->slots_buffer() == NULL);
 
     if (FLAG_stress_compaction) {
-      if (FLAG_manual_evacuation_candidates_selection) {
-        if (p->IsFlagSet(MemoryChunk::FORCE_EVACUATION_CANDIDATE_FOR_TESTING)) {
-          p->ClearFlag(MemoryChunk::FORCE_EVACUATION_CANDIDATE_FOR_TESTING);
-          fragmentation = 1;
-        }
-      } else {
       unsigned int counter = space->heap()->ms_count();
+      uintptr_t page_number = reinterpret_cast<uintptr_t>(p) >> kPageSizeBits;
       if ((counter & 1) == (page_number & 1)) fragmentation = 1;
-        page_number++;
-      }
     } else if (mode == REDUCE_MEMORY_FOOTPRINT && !FLAG_always_compact) {
       // Don't try to release too many pages.
       if (estimated_release >= over_reserved) {
@@ -3109,14 +3047,10 @@ bool MarkCompactCollector::TryPromoteObject(HeapObject* object,
 }
 
 
-bool MarkCompactCollector::IsSlotInBlackObject(Page* p, Address slot,
-                                               HeapObject** out_object) {
+bool MarkCompactCollector::IsSlotInBlackObject(Page* p, Address slot) {
   // This function does not support large objects right now.
   Space* owner = p->owner();
-  if (owner == heap_->lo_space() || owner == NULL) {
-    *out_object = NULL;
-    return true;
-  }
+  if (owner == heap_->lo_space() || owner == NULL) return true;
 
   uint32_t mark_bit_index = p->AddressToMarkbitIndex(slot);
   unsigned int start_index = mark_bit_index >> Bitmap::kBitsPerCellLog2;
@@ -3170,7 +3104,6 @@ bool MarkCompactCollector::IsSlotInBlackObject(Page* p, Address slot,
       (object->address() + object->Size()) > slot) {
     // If the slot is within the last found object in the cell, the slot is
     // in a live object.
-    *out_object = object;
     return true;
   }
   return false;
@@ -3212,38 +3145,28 @@ bool MarkCompactCollector::IsSlotInBlackObjectSlow(Page* p, Address slot) {
 }
 
 
-bool MarkCompactCollector::IsSlotInLiveObject(Address slot) {
-  HeapObject* object = NULL;
-  // The target object is black but we don't know if the source slot is black.
-  // The source object could have died and the slot could be part of a free
-  // space. Find out based on mark bits if the slot is part of a live object.
-  if (!IsSlotInBlackObject(Page::FromAddress(slot), slot, &object)) {
+bool MarkCompactCollector::IsSlotInLiveObject(HeapObject** address,
+                                              HeapObject* object) {
+  // If the target object is not black, the source slot must be part
+  // of a non-black (dead) object.
+  if (!Marking::IsBlack(Marking::MarkBitFrom(object))) {
     return false;
   }
 
-#if V8_DOUBLE_FIELDS_UNBOXING
-  // |object| is NULL only when the slot belongs to large object space.
-  DCHECK(object != NULL ||
-         Page::FromAnyPointerAddress(heap_, slot)->owner() ==
-             heap_->lo_space());
-  // We don't need to check large objects' layout descriptor since it can't
-  // contain in-object fields anyway.
-  if (object != NULL) {
-    // Filter out slots that happens to point to unboxed double fields.
-    LayoutDescriptorHelper helper(object->map());
-    bool has_only_tagged_fields = helper.all_fields_tagged();
-    if (!has_only_tagged_fields &&
-        !helper.IsTagged(static_cast<int>(slot - object->address()))) {
+  // The target object is black but we don't know if the source slot is black.
+  // The source object could have died and the slot could be part of a free
+  // space. Find out based on mark bits if the slot is part of a live object.
+  if (!IsSlotInBlackObject(
+          Page::FromAddress(reinterpret_cast<Address>(address)),
+          reinterpret_cast<Address>(address))) {
     return false;
   }
-  }
-#endif
 
   return true;
 }
 
 
-void MarkCompactCollector::VerifyIsSlotInLiveObject(Address slot,
+void MarkCompactCollector::VerifyIsSlotInLiveObject(HeapObject** address,
                                                     HeapObject* object) {
   // The target object has to be black.
   CHECK(Marking::IsBlack(Marking::MarkBitFrom(object)));
@@ -3251,7 +3174,9 @@ void MarkCompactCollector::VerifyIsSlotInLiveObject(Address slot,
   // The target object is black but we don't know if the source slot is black.
   // The source object could have died and the slot could be part of a free
   // space. Use the mark bit iterator to find out about liveness of the slot.
-  CHECK(IsSlotInBlackObjectSlow(Page::FromAddress(slot), slot));
+  CHECK(IsSlotInBlackObjectSlow(
+      Page::FromAddress(reinterpret_cast<Address>(address)),
+      reinterpret_cast<Address>(address)));
 }
 
 
@@ -4570,66 +4495,6 @@ bool SlotsBuffer::AddTo(SlotsBufferAllocator* allocator,
 }
 
 
-static Object* g_smi_slot = NULL;
-
-
-void SlotsBuffer::RemoveInvalidSlots(Heap* heap, SlotsBuffer* buffer) {
-  DCHECK_EQ(Smi::FromInt(0), g_smi_slot);
-
-  // Remove entries by replacing them with a dummy slot containing a smi.
-  const ObjectSlot kRemovedEntry = &g_smi_slot;
-
-  while (buffer != NULL) {
-    SlotsBuffer::ObjectSlot* slots = buffer->slots_;
-    intptr_t slots_count = buffer->idx_;
-
-    for (int slot_idx = 0; slot_idx < slots_count; ++slot_idx) {
-      ObjectSlot slot = slots[slot_idx];
-      if (!IsTypedSlot(slot)) {
-        Object* object = *slot;
-        if (object->IsHeapObject()) {
-          if (heap->InNewSpace(object) ||
-              !heap->mark_compact_collector()->IsSlotInLiveObject(
-                  reinterpret_cast<Address>(slot))) {
-            slots[slot_idx] = kRemovedEntry;
-          }
-        }
-      } else {
-        ++slot_idx;
-        DCHECK(slot_idx < slots_count);
-      }
-    }
-    buffer = buffer->next();
-  }
-}
-
-
-void SlotsBuffer::VerifySlots(Heap* heap, SlotsBuffer* buffer) {
-  DCHECK_EQ(Smi::FromInt(0), g_smi_slot);
-
-  while (buffer != NULL) {
-    SlotsBuffer::ObjectSlot* slots = buffer->slots_;
-    intptr_t slots_count = buffer->idx_;
-
-    for (int slot_idx = 0; slot_idx < slots_count; ++slot_idx) {
-      ObjectSlot slot = slots[slot_idx];
-      if (!IsTypedSlot(slot)) {
-        Object* object = *slot;
-        if (object->IsHeapObject()) {
-          CHECK(!heap->InNewSpace(object));
-          CHECK(heap->mark_compact_collector()->IsSlotInLiveObject(
-              reinterpret_cast<Address>(slot)));
-        }
-      } else {
-        ++slot_idx;
-        DCHECK(slot_idx < slots_count);
-      }
-    }
-    buffer = buffer->next();
-  }
-}
-
-
 static inline SlotsBuffer::SlotType SlotTypeForRMode(RelocInfo::Mode rmode) {
   if (RelocInfo::IsCodeTarget(rmode)) {
     return SlotsBuffer::CODE_TARGET_SLOT;

src/heap/mark-compact.h

@@ -363,15 +363,6 @@ class SlotsBuffer {
                     SlotsBuffer** buffer_address, SlotType type, Address addr,
                     AdditionMode mode);
 
-  // Eliminates all stale entries from the slots buffer, i.e., slots that
-  // are not part of live objects anymore. This method must be called after
-  // marking, when the whole transitive closure is known and must be called
-  // before sweeping when mark bits are still intact.
-  static void RemoveInvalidSlots(Heap* heap, SlotsBuffer* buffer);
-
-  // Ensures that there are no invalid slots in the chain of slots buffers.
-  static void VerifySlots(Heap* heap, SlotsBuffer* buffer);
-
   static const int kNumberOfElements = 1021;
 
  private:
@@ -688,10 +679,10 @@ class MarkCompactCollector {
   // The following four methods can just be called after marking, when the
   // whole transitive closure is known. They must be called before sweeping
   // when mark bits are still intact.
-  bool IsSlotInBlackObject(Page* p, Address slot, HeapObject** out_object);
+  bool IsSlotInBlackObject(Page* p, Address slot);
   bool IsSlotInBlackObjectSlow(Page* p, Address slot);
-  bool IsSlotInLiveObject(Address slot);
-  void VerifyIsSlotInLiveObject(Address slot, HeapObject* object);
+  bool IsSlotInLiveObject(HeapObject** address, HeapObject* object);
+  void VerifyIsSlotInLiveObject(HeapObject** address, HeapObject* object);
 
  private:
   class SweeperTask;
@@ -703,8 +694,6 @@ class MarkCompactCollector {
   bool WillBeDeoptimized(Code* code);
   void RemoveDeadInvalidatedCode();
   void ProcessInvalidatedCode(ObjectVisitor* visitor);
-  void ClearInvalidSlotsBufferEntries(PagedSpace* space);
-  void ClearInvalidStoreAndSlotsBufferEntries();
 
   void StartSweeperThreads();
 

src/heap/spaces.h

@@ -385,12 +385,6 @@ class MemoryChunk {
     // to grey transition is performed in the value.
     HAS_PROGRESS_BAR,
 
-    // This flag is intended to be used for testing. Works only when both
-    // FLAG_stress_compaction and FLAG_manual_evacuation_candidates_selection
-    // are set. It forces the page to become an evacuation candidate at next
-    // candidates selection cycle.
-    FORCE_EVACUATION_CANDIDATE_FOR_TESTING,
-
     // Last flag, keep at bottom.
     NUM_MEMORY_CHUNK_FLAGS
   };

src/heap/store-buffer.cc

@@ -361,14 +361,12 @@ void StoreBuffer::ClearInvalidStoreBufferEntries() {
   Address* new_top = old_start_;
   for (Address* current = old_start_; current < old_top_; current++) {
     Address addr = *current;
-    Object** slot = reinterpret_cast<Object**>(addr);
+    Object** slot = reinterpret_cast<Object**>(*current);
     Object* object = *slot;
-    if (heap_->InNewSpace(object) && object->IsHeapObject()) {
-      // If the target object is not black, the source slot must be part
-      // of a non-black (dead) object.
-      HeapObject* heap_object = HeapObject::cast(object);
-      if (Marking::IsBlack(Marking::MarkBitFrom(heap_object)) &&
-          heap_->mark_compact_collector()->IsSlotInLiveObject(addr)) {
+    if (heap_->InNewSpace(object)) {
+      if (heap_->mark_compact_collector()->IsSlotInLiveObject(
+              reinterpret_cast<HeapObject**>(slot),
+              reinterpret_cast<HeapObject*>(object))) {
         *new_top++ = addr;
       }
     }
@@ -391,10 +389,10 @@ void StoreBuffer::VerifyValidStoreBufferEntries() {
   for (Address* current = old_start_; current < old_top_; current++) {
     Object** slot = reinterpret_cast<Object**>(*current);
     Object* object = *slot;
-    CHECK(object->IsHeapObject());
     CHECK(heap_->InNewSpace(object));
     heap_->mark_compact_collector()->VerifyIsSlotInLiveObject(
-        reinterpret_cast<Address>(slot), HeapObject::cast(object));
+        reinterpret_cast<HeapObject**>(slot),
+        reinterpret_cast<HeapObject*>(object));
   }
 }
 

test/cctest/test-unboxed-doubles.cc

@@ -48,12 +48,6 @@ static Handle<String> MakeName(const char* str, int suffix) {
 }
 
 
-Handle<JSObject> GetObject(const char* name) {
-  return v8::Utils::OpenHandle(
-      *v8::Handle<v8::Object>::Cast(CcTest::global()->Get(v8_str(name))));
-}
-
-
 static double GetDoubleFieldValue(JSObject* obj, FieldIndex field_index) {
   if (obj->IsUnboxedDoubleField(field_index)) {
     return obj->RawFastDoublePropertyAt(field_index);
@@ -1311,211 +1305,4 @@ TEST(WriteBarriersInCopyJSObject) {
   CHECK_EQ(boom_value, clone->RawFastDoublePropertyAt(index));
 }
 
-
-static void TestWriteBarrier(Handle<Map> map, Handle<Map> new_map,
-                             int tagged_descriptor, int double_descriptor,
-                             bool check_tagged_value = true) {
-  FLAG_stress_compaction = true;
-  FLAG_manual_evacuation_candidates_selection = true;
-  Isolate* isolate = CcTest::i_isolate();
-  Factory* factory = isolate->factory();
-  Heap* heap = CcTest::heap();
-  PagedSpace* old_pointer_space = heap->old_pointer_space();
-
-  // The plan: create |obj| by |map| in old space, create |obj_value| in
-  // new space and ensure that write barrier is triggered when |obj_value| is
-  // written to property |tagged_descriptor| of |obj|.
-  // Then migrate object to |new_map| and set proper value for property
-  // |double_descriptor|. Call GC and ensure that it did not crash during
-  // store buffer entries updating.
-
-  Handle<JSObject> obj;
-  Handle<HeapObject> obj_value;
-  {
-    AlwaysAllocateScope always_allocate(isolate);
-    obj = factory->NewJSObjectFromMap(map, TENURED, false);
-    CHECK(old_pointer_space->Contains(*obj));
-
-    obj_value = factory->NewJSArray(32 * KB, FAST_HOLEY_ELEMENTS);
-  }
-
-  CHECK(heap->InNewSpace(*obj_value));
-
-  {
-    FieldIndex index = FieldIndex::ForDescriptor(*map, tagged_descriptor);
-    const int n = 153;
-    for (int i = 0; i < n; i++) {
-      obj->FastPropertyAtPut(index, *obj_value);
-    }
-  }
-
-  // Migrate |obj| to |new_map| which should shift fields and put the
-  // |boom_value| to the slot that was earlier recorded by write barrier.
-  JSObject::MigrateToMap(obj, new_map);
-
-  Address fake_object = reinterpret_cast<Address>(*obj_value) + kPointerSize;
-  double boom_value = bit_cast<double>(fake_object);
-
-  FieldIndex double_field_index =
-      FieldIndex::ForDescriptor(*new_map, double_descriptor);
-  CHECK(obj->IsUnboxedDoubleField(double_field_index));
-  obj->RawFastDoublePropertyAtPut(double_field_index, boom_value);
-
-  // Trigger GC to evacuate all candidates.
-  CcTest::heap()->CollectGarbage(NEW_SPACE, "boom");
-
-  if (check_tagged_value) {
-    FieldIndex tagged_field_index =
-        FieldIndex::ForDescriptor(*new_map, tagged_descriptor);
-    CHECK_EQ(*obj_value, obj->RawFastPropertyAt(tagged_field_index));
-  }
-  CHECK_EQ(boom_value, obj->RawFastDoublePropertyAt(double_field_index));
-}
-
-
-static void TestIncrementalWriteBarrier(Handle<Map> map, Handle<Map> new_map,
-                                        int tagged_descriptor,
-                                        int double_descriptor,
-                                        bool check_tagged_value = true) {
-  if (FLAG_never_compact || !FLAG_incremental_marking) return;
-  FLAG_stress_compaction = true;
-  FLAG_manual_evacuation_candidates_selection = true;
-  Isolate* isolate = CcTest::i_isolate();
-  Factory* factory = isolate->factory();
-  Heap* heap = CcTest::heap();
-  PagedSpace* old_pointer_space = heap->old_pointer_space();
-
-  // The plan: create |obj| by |map| in old space, create |obj_value| in
-  // old space and ensure it end up in evacuation candidate page. Start
-  // incremental marking and ensure that incremental write barrier is triggered
-  // when |obj_value| is written to property |tagged_descriptor| of |obj|.
-  // Then migrate object to |new_map| and set proper value for property
-  // |double_descriptor|. Call GC and ensure that it did not crash during
-  // slots buffer entries updating.
-
-  Handle<JSObject> obj;
-  Handle<HeapObject> obj_value;
-  Page* ec_page;
-  {
-    AlwaysAllocateScope always_allocate(isolate);
-    obj = factory->NewJSObjectFromMap(map, TENURED, false);
-    CHECK(old_pointer_space->Contains(*obj));
-
-    // Make sure |obj_value| is placed on an old-space evacuation candidate.
-    SimulateFullSpace(old_pointer_space);
-    obj_value = factory->NewJSArray(32 * KB, FAST_HOLEY_ELEMENTS, TENURED);
-    ec_page = Page::FromAddress(obj_value->address());
-    CHECK_NE(ec_page, Page::FromAddress(obj->address()));
-  }
-
-  // Heap is ready, force |ec_page| to become an evacuation candidate and
-  // simulate incremental marking.
-  ec_page->SetFlag(MemoryChunk::FORCE_EVACUATION_CANDIDATE_FOR_TESTING);
-  SimulateIncrementalMarking(heap);
-
-  // Check that everything is ready for triggering incremental write barrier
-  // (i.e. that both |obj| and |obj_value| are black and the marking phase is
-  // still active and |obj_value|'s page is indeed an evacuation candidate).
-  IncrementalMarking* marking = heap->incremental_marking();
-  CHECK(marking->IsMarking());
-  CHECK(Marking::IsBlack(Marking::MarkBitFrom(*obj)));
-  CHECK(Marking::IsBlack(Marking::MarkBitFrom(*obj_value)));
-  CHECK(MarkCompactCollector::IsOnEvacuationCandidate(*obj_value));
-
-  // Trigger incremental write barrier, which should add a slot to |ec_page|'s
-  // slots buffer.
-  {
-    int slots_buffer_len = SlotsBuffer::SizeOfChain(ec_page->slots_buffer());
-    FieldIndex index = FieldIndex::ForDescriptor(*map, tagged_descriptor);
-    const int n = SlotsBuffer::kNumberOfElements + 10;
-    for (int i = 0; i < n; i++) {
-      obj->FastPropertyAtPut(index, *obj_value);
-    }
-    // Ensure that the slot was actually added to the |ec_page|'s slots buffer.
-    CHECK_EQ(slots_buffer_len + n,
-             SlotsBuffer::SizeOfChain(ec_page->slots_buffer()));
-  }
-
-  // Migrate |obj| to |new_map| which should shift fields and put the
-  // |boom_value| to the slot that was earlier recorded by incremental write
-  // barrier.
-  JSObject::MigrateToMap(obj, new_map);
-
-  double boom_value = bit_cast<double>(UINT64_C(0xbaad0176a37c28e1));
-
-  FieldIndex double_field_index =
-      FieldIndex::ForDescriptor(*new_map, double_descriptor);
-  CHECK(obj->IsUnboxedDoubleField(double_field_index));
-  obj->RawFastDoublePropertyAtPut(double_field_index, boom_value);
-
-  // Trigger GC to evacuate all candidates.
-  CcTest::heap()->CollectGarbage(OLD_POINTER_SPACE, "boom");
-
-  // Ensure that the values are still there and correct.
-  CHECK(!MarkCompactCollector::IsOnEvacuationCandidate(*obj_value));
-
-  if (check_tagged_value) {
-    FieldIndex tagged_field_index =
-        FieldIndex::ForDescriptor(*new_map, tagged_descriptor);
-    CHECK_EQ(*obj_value, obj->RawFastPropertyAt(tagged_field_index));
-  }
-  CHECK_EQ(boom_value, obj->RawFastDoublePropertyAt(double_field_index));
-}
-
-
-enum WriteBarrierKind { OLD_TO_OLD_WRITE_BARRIER, OLD_TO_NEW_WRITE_BARRIER };
-static void TestWriteBarrierObjectShiftFieldsRight(
-    WriteBarrierKind write_barrier_kind) {
-  CcTest::InitializeVM();
-  Isolate* isolate = CcTest::i_isolate();
-  v8::HandleScope scope(CcTest::isolate());
-
-  Handle<HeapType> any_type = HeapType::Any(isolate);
-
-  CompileRun("function func() { return 1; }");
-
-  Handle<JSObject> func = GetObject("func");
-
-  Handle<Map> map = Map::Create(isolate, 10);
-  map = Map::CopyWithConstant(map, MakeName("prop", 0), func, NONE,
-                              INSERT_TRANSITION).ToHandleChecked();
-  map = Map::CopyWithField(map, MakeName("prop", 1), any_type, NONE,
-                           Representation::Double(),
-                           INSERT_TRANSITION).ToHandleChecked();
-  map = Map::CopyWithField(map, MakeName("prop", 2), any_type, NONE,
-                           Representation::Tagged(),
-                           INSERT_TRANSITION).ToHandleChecked();
-
-  // Shift fields right by turning constant property to a field.
-  Handle<Map> new_map = Map::ReconfigureProperty(
-      map, 0, kData, NONE, Representation::Tagged(), any_type, FORCE_FIELD);
-
-  if (write_barrier_kind == OLD_TO_NEW_WRITE_BARRIER) {
-    TestWriteBarrier(map, new_map, 2, 1);
-  } else {
-    CHECK_EQ(OLD_TO_OLD_WRITE_BARRIER, write_barrier_kind);
-    TestIncrementalWriteBarrier(map, new_map, 2, 1);
-  }
-}
-
-
-// TODO(ishell): enable when this issue is fixed.
-DISABLED_TEST(WriteBarrierObjectShiftFieldsRight) {
-  TestWriteBarrierObjectShiftFieldsRight(OLD_TO_NEW_WRITE_BARRIER);
-}
-
-
-TEST(IncrementalWriteBarrierObjectShiftFieldsRight) {
-  TestWriteBarrierObjectShiftFieldsRight(OLD_TO_OLD_WRITE_BARRIER);
-}
-
-
-// TODO(ishell): add respective tests for property kind reconfiguring from
-// accessor field to double, once accessor fields are supported by
-// Map::ReconfigureProperty().
-
-
-// TODO(ishell): add respective tests for fast property removal case once
-// Map::ReconfigureProperty() supports that.
-
 #endif