Fix/implement new write barrier for x64.

src/serialize.cc

 // Copyright 2006-2008 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
@@ skipping 634 matching lines @@
   ASSERT(SpaceIsPaged(space));
   int page_of_pointee = offset >> kPageSizeBits;
   Address object_address = pages_[space][page_of_pointee] +
                            (offset & Page::kPageAlignmentMask);
   return HeapObject::FromAddress(object_address);
 }
 
 
 void Deserializer::Deserialize() {
   // Don't GC while deserializing - just expand the heap.
+  Address* write_buffer_top =
+      reinterpret_cast<Address*>(Heap::write_buffer_top());
   AlwaysAllocateScope always_allocate;
   // Don't use the free lists while deserializing.
   LinearAllocationScope allocate_linearly;
   // No active threads.
   ASSERT_EQ(NULL, ThreadState::FirstInUse());
   // No active handles.
   ASSERT(HandleScopeImplementer::instance()->blocks()->is_empty());
   // Make sure the entire partial snapshot cache is traversed, filling it with
   // valid object pointers.
   partial_snapshot_cache_length_ = kPartialSnapshotCacheCapacity;
   ASSERT_EQ(NULL, external_reference_decoder_);
   external_reference_decoder_ = new ExternalReferenceDecoder();
   Heap::IterateStrongRoots(this, VISIT_ONLY_STRONG);
   Heap::IterateWeakRoots(this, VISIT_ALL);
 
   Heap::set_global_contexts_list(Heap::undefined_value());
+  Heap::public_set_write_buffer_top(write_buffer_top);
 }
 
 
 void Deserializer::DeserializePartial(Object** root) {
   // Don't GC while deserializing - just expand the heap.
   AlwaysAllocateScope always_allocate;
   // Don't use the free lists while deserializing.
   LinearAllocationScope allocate_linearly;
   if (external_reference_decoder_ == NULL) {
     external_reference_decoder_ = new ExternalReferenceDecoder();
@@ skipping 841 matching lines @@
       fullness_[space] = RoundUp(fullness_[space], Page::kPageSize);
     }
   }
   int allocation_address = fullness_[space];
   fullness_[space] = allocation_address + size;
   return allocation_address;
 }
 
 
 } }  // namespace v8::internal