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diff --git a/Source/JavaScriptCore/bytecode/ProxyableAccessCase.h b/Source/JavaScriptCore/bytecode/ProxyableAccessCase.h
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+++ b/Source/JavaScriptCore/bytecode/ProxyableAccessCase.h
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+/*
+ * Copyright (C) 2017 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. ``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
+ * 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.
+ */
+
+#pragma once
+
+#if ENABLE(JIT)
+
+#include "AccessCase.h"
+
+namespace JSC {
+
+class ProxyableAccessCase : public AccessCase {
+public:
+    typedef AccessCase Base;
+
+    bool viaProxy() const override { return m_viaProxy; }
+    WatchpointSet* additionalSet() const override { return m_additionalSet.get(); }
+
+    static std::unique_ptr<AccessCase> create(VM&, JSCell*, AccessType, PropertyOffset, Structure*, const ObjectPropertyConditionSet& = ObjectPropertyConditionSet(),
+        bool viaProxy = false, WatchpointSet* additionalSet = nullptr);
+
+    void dumpImpl(PrintStream&, CommaPrinter&) const override;
+    std::unique_ptr<AccessCase> clone() const override;
+
+    ~ProxyableAccessCase();
+
+protected:
+    ProxyableAccessCase(VM&, JSCell*, AccessType, PropertyOffset, Structure*, const ObjectPropertyConditionSet&, bool viaProxy, WatchpointSet* additionalSet);
+
+private:
+    bool m_viaProxy;
+    RefPtr<WatchpointSet> m_additionalSet;
+};
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)