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diff --git a/Source/JavaScriptCore/heap/WriteBarrierBuffer.cpp b/Source/JavaScriptCore/heap/WriteBarrierBuffer.cpp
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+++ b/Source/JavaScriptCore/heap/WriteBarrierBuffer.cpp
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+/*
+ * Copyright (C) 2013 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
+ */
+
+#include "config.h"
+#include "WriteBarrierBuffer.h"
+
+#include "GCAssertions.h"
+#include "Heap.h"
+#include "JSCell.h"
+#include "JSCInlines.h"
+#include "Structure.h"
+
+namespace JSC {
+
+WriteBarrierBuffer::WriteBarrierBuffer(unsigned capacity)
+    : m_currentIndex(0)
+    , m_capacity(capacity)
+    , m_buffer(static_cast<JSCell**>(fastMalloc(sizeof(JSCell*) * capacity)))
+{
+}
+
+WriteBarrierBuffer::~WriteBarrierBuffer()
+{
+    fastFree(m_buffer);
+}
+
+void WriteBarrierBuffer::flush(Heap& heap)
+{
+    ASSERT(m_currentIndex <= m_capacity);
+    for (size_t i = 0; i < m_currentIndex; ++i)
+        heap.writeBarrier(m_buffer[i]);
+    m_currentIndex = 0;
+}
+
+void WriteBarrierBuffer::reset()
+{
+    m_currentIndex = 0;
+}
+
+void WriteBarrierBuffer::add(JSCell* cell)
+{
+    ASSERT_GC_OBJECT_LOOKS_VALID(cell);
+    ASSERT(m_currentIndex < m_capacity);
+    m_buffer[m_currentIndex++] = cell;
+}
+
+} // namespace JSC