Change RecordSlot interface. Make it more robust by replacing anchor slot with actual object.

src/heap/mark-compact-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HEAP_MARK_COMPACT_INL_H_
 #define V8_HEAP_MARK_COMPACT_INL_H_
 
 #include "src/heap/mark-compact.h"
 #include "src/isolate.h"
 
@@ skipping 37 matching lines @@
 }
 
 
 bool MarkCompactCollector::IsMarked(Object* obj) {
   DCHECK(obj->IsHeapObject());
   HeapObject* heap_object = HeapObject::cast(obj);
   return Marking::IsBlackOrGrey(Marking::MarkBitFrom(heap_object));
 }
 
 
-void MarkCompactCollector::RecordSlot(Object** anchor_slot, Object** slot,
-                                      Object* object,
+void MarkCompactCollector::RecordSlot(HeapObject* object, Object** slot,
+                                      Object* target,
                                       SlotsBuffer::AdditionMode mode) {
-  Page* object_page = Page::FromAddress(reinterpret_cast<Address>(object));
-  if (object_page->IsEvacuationCandidate() &&
-      !ShouldSkipEvacuationSlotRecording(anchor_slot)) {
+  Page* target_page = Page::FromAddress(reinterpret_cast<Address>(target));
+  if (target_page->IsEvacuationCandidate() &&
+      !ShouldSkipEvacuationSlotRecording(object)) {
     if (!SlotsBuffer::AddTo(&slots_buffer_allocator_,
-                            object_page->slots_buffer_address(), slot, mode)) {
-      EvictPopularEvacuationCandidate(object_page);
+                            target_page->slots_buffer_address(), slot, mode)) {
+      EvictPopularEvacuationCandidate(target_page);
     }
   }
 }
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_MARK_COMPACT_INL_H_