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diff --git a/Source/JavaScriptCore/dfg/DFGDesiredTransitions.cpp b/Source/JavaScriptCore/dfg/DFGDesiredTransitions.cpp
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+++ b/Source/JavaScriptCore/dfg/DFGDesiredTransitions.cpp
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+/*
+ * Copyright (C) 2013, 2014 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 "DFGDesiredTransitions.h"
+
+#if ENABLE(DFG_JIT)
+
+#include "CodeBlock.h"
+#include "DFGCommonData.h"
+#include "JSCInlines.h"
+
+namespace JSC { namespace DFG {
+
+DesiredTransition::DesiredTransition(CodeBlock* codeBlock, CodeBlock* codeOriginOwner, Structure* oldStructure, Structure* newStructure)
+    : m_codeBlock(codeBlock)
+    , m_codeOriginOwner(codeOriginOwner)
+    , m_oldStructure(oldStructure)
+    , m_newStructure(newStructure)
+{
+}
+
+void DesiredTransition::reallyAdd(VM& vm, CommonData* common)
+{
+    common->transitions.append(
+        WeakReferenceTransition(
+            vm, m_codeBlock,
+            m_codeOriginOwner,
+            m_oldStructure, m_newStructure));
+}
+
+void DesiredTransition::visitChildren(SlotVisitor& visitor)
+{
+    visitor.appendUnbarrieredPointer(&m_codeOriginOwner);
+    visitor.appendUnbarrieredPointer(&m_oldStructure);
+    visitor.appendUnbarrieredPointer(&m_newStructure);
+}
+
+DesiredTransitions::DesiredTransitions()
+{
+}
+
+DesiredTransitions::~DesiredTransitions()
+{
+}
+
+void DesiredTransitions::addLazily(CodeBlock* codeBlock, CodeBlock* codeOriginOwner, Structure* oldStructure, Structure* newStructure)
+{
+    m_transitions.append(DesiredTransition(codeBlock, codeOriginOwner, oldStructure, newStructure));
+}
+
+void DesiredTransitions::reallyAdd(VM& vm, CommonData* common)
+{
+    for (unsigned i = 0; i < m_transitions.size(); i++)
+        m_transitions[i].reallyAdd(vm, common);
+}
+
+void DesiredTransitions::visitChildren(SlotVisitor& visitor)
+{
+    for (unsigned i = 0; i < m_transitions.size(); i++)
+        m_transitions[i].visitChildren(visitor);
+}
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)