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diff --git a/deps/v8/src/mark-compact-inl.h b/deps/v8/src/mark-compact-inl.h
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+// Copyright 2011 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef V8_MARK_COMPACT_INL_H_
+#define V8_MARK_COMPACT_INL_H_
+
+#include "isolate.h"
+#include "memory.h"
+#include "mark-compact.h"
+
+
+namespace v8 {
+namespace internal {
+
+
+MarkBit Marking::MarkBitFrom(Address addr) {
+  MemoryChunk *p = MemoryChunk::FromAddress(addr);
+  return p->markbits()->MarkBitFromIndex(p->AddressToMarkbitIndex(addr),
+                                         p->ContainsOnlyData());
+}
+
+
+void MarkCompactCollector::SetFlags(int flags) {
+  sweep_precisely_ = ((flags & Heap::kMakeHeapIterableMask) != 0);
+}
+
+
+void MarkCompactCollector::MarkObject(HeapObject* obj, MarkBit mark_bit) {
+  ASSERT(Marking::MarkBitFrom(obj) == mark_bit);
+  if (!mark_bit.Get()) {
+    mark_bit.Set();
+    MemoryChunk::IncrementLiveBytes(obj->address(), obj->Size());
+#ifdef DEBUG
+    UpdateLiveObjectCount(obj);
+#endif
+    ProcessNewlyMarkedObject(obj);
+  }
+}
+
+
+void MarkCompactCollector::SetMark(HeapObject* obj, MarkBit mark_bit) {
+  ASSERT(!mark_bit.Get());
+  ASSERT(Marking::MarkBitFrom(obj) == mark_bit);
+  mark_bit.Set();
+  MemoryChunk::IncrementLiveBytes(obj->address(), obj->Size());
+#ifdef DEBUG
+  UpdateLiveObjectCount(obj);
+#endif
+}
+
+
+bool MarkCompactCollector::IsMarked(Object* obj) {
+  ASSERT(obj->IsHeapObject());
+  HeapObject* heap_object = HeapObject::cast(obj);
+  return Marking::MarkBitFrom(heap_object).Get();
+}
+
+
+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_