Support compaction for code space pages.

src/mark-compact-inl.h

Index: src/mark-compact-inl.h
diff --git a/src/mark-compact-inl.h b/src/mark-compact-inl.h
index c28e6e3e29d6507fab97ff0b2ba7da2eef4cc638..20f11a78a2e34f61ce5464217839b6f66b89094e 100644
--- a/src/mark-compact-inl.h
+++ b/src/mark-compact-inl.h
@@ -32,6 +32,7 @@
 #include "memory.h"
 #include "mark-compact.h"
 
+
 namespace v8 {
 namespace internal {
 
@@ -79,6 +80,22 @@ bool MarkCompactCollector::IsMarked(Object* obj) {
 }
 
 
+void MarkCompactCollector::RecordSlot(Object** anchor_slot,
+                                      Object** slot,
+                                      Object* object) {
+  Page* object_page = Page::FromAddress(reinterpret_cast<Address>(object));
+  if (object_page->IsEvacuationCandidate() &&
+      !ShouldSkipEvacuationSlotRecording(anchor_slot)) {
+    if (!SlotsBuffer::AddTo(&slots_buffer_allocator_,
+                            object_page->slots_buffer_address(),
+                            slot,
+                            SlotsBuffer::FAIL_ON_OVERFLOW)) {
+      EvictEvacuationCandidate(object_page);
+    }
+  }
+}
+
+
 } }  // namespace v8::internal
 
 #endif  // V8_MARK_COMPACT_INL_H_