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diff --git a/Source/JavaScriptCore/dfg/DFGDesiredWriteBarriers.cpp b/Source/JavaScriptCore/dfg/DFGDesiredWriteBarriers.cpp
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+++ b/Source/JavaScriptCore/dfg/DFGDesiredWriteBarriers.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"
+
+#if ENABLE(DFG_JIT)
+
+#include "DFGDesiredWriteBarriers.h"
+
+#include "CodeBlock.h"
+#include "JSCJSValueInlines.h"
+
+namespace JSC { namespace DFG {
+
+DesiredWriteBarrier::DesiredWriteBarrier(Type type, CodeBlock* codeBlock, unsigned index, JSCell* owner)
+    : m_owner(owner)
+    , m_type(type)
+    , m_codeBlock(codeBlock)
+{
+    m_which.index = index;
+}
+
+DesiredWriteBarrier::DesiredWriteBarrier(Type type, CodeBlock* codeBlock, InlineCallFrame* inlineCallFrame, JSCell* owner)
+    : m_owner(owner)
+    , m_type(type)
+    , m_codeBlock(codeBlock)
+{
+    m_which.inlineCallFrame = inlineCallFrame;
+}
+
+void DesiredWriteBarrier::trigger(VM& vm)
+{
+    switch (m_type) {
+    case ConstantType: {
+        WriteBarrier<Unknown>& barrier = m_codeBlock->constants()[m_which.index];
+        barrier.set(vm, m_owner, barrier.get());
+        return;
+    }
+
+    case InlineCallFrameExecutableType: {
+        InlineCallFrame* inlineCallFrame = m_which.inlineCallFrame;
+        WriteBarrier<ScriptExecutable>& executable = inlineCallFrame->executable;
+        executable.set(vm, m_owner, executable.get());
+        return;
+    } }
+    RELEASE_ASSERT_NOT_REACHED();
+}
+
+DesiredWriteBarriers::DesiredWriteBarriers()
+{
+}
+
+DesiredWriteBarriers::~DesiredWriteBarriers()
+{
+}
+
+void DesiredWriteBarriers::trigger(VM& vm)
+{
+    for (unsigned i = 0; i < m_barriers.size(); i++)
+        m_barriers[i].trigger(vm);
+}
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)