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diff --git a/Source/JavaScriptCore/runtime/RuntimeFlags.h b/Source/JavaScriptCore/runtime/RuntimeFlags.h
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+++ b/Source/JavaScriptCore/runtime/RuntimeFlags.h
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+/*
+ * Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
+ *
+ * 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.
+ */
+
+#ifndef RuntimeFlags_h
+#define RuntimeFlags_h
+
+#include <initializer_list>
+
+namespace JSC {
+
+// macro(name, isEnabledFlag)
+#define JSC_RUNTIME_FLAG(macro)
+
+class RuntimeFlags {
+private:
+    enum RuntimeFlagShiftValue : unsigned {
+#define JSC_DECLARE_RUNTIME_FLAG_SHIFT_VALUE(name, isEnabledFlag) shiftValueFor##name,
+        JSC_RUNTIME_FLAG(JSC_DECLARE_RUNTIME_FLAG_SHIFT_VALUE)
+#undef JSC_DECLARE_RUNTIME_FLAG_SHIFT_VALUE
+    };
+
+public:
+    enum RuntimeFlag : unsigned {
+#define JSC_DECLARE_RUNTIME_FLAG(name, isEnabledFlag) name = 1u << (shiftValueFor##name),
+        JSC_RUNTIME_FLAG(JSC_DECLARE_RUNTIME_FLAG)
+#undef JSC_DECLARE_RUNTIME_FLAG
+    };
+
+#define JSC_DECLARE_RUNTIME_FLAG_ACCESSOR(name, isEnabledFlag) \
+    void set##name(bool value)\
+    {\
+        if (value)\
+            m_flags |= name;\
+        else\
+            m_flags &= (~name);\
+    }\
+    bool is##name() const\
+    {\
+        return m_flags & name;\
+    }
+    JSC_RUNTIME_FLAG(JSC_DECLARE_RUNTIME_FLAG_ACCESSOR)
+#undef JSC_DECLARE_RUNTIME_FLAG_ACCESSOR
+
+    RuntimeFlags()
+        : RuntimeFlags(0u)
+    {
+    }
+
+    RuntimeFlags(std::initializer_list<RuntimeFlag> initializerList)
+        : RuntimeFlags()
+    {
+        for (RuntimeFlag flag : initializerList)
+            m_flags |= flag;
+    }
+
+    explicit RuntimeFlags(unsigned flags)
+        : m_flags(flags)
+    {
+    }
+
+    static RuntimeFlags createAllEnabled()
+    {
+        return RuntimeFlags(
+#define JSC_USE_RUNTIME_FLAG(name, isEnabledFlag) ((isEnabledFlag) ? name : 0u) |
+            JSC_RUNTIME_FLAG(JSC_USE_RUNTIME_FLAG)
+#undef JSC_USE_RUNTIME_FLAG
+            0u
+        );
+    }
+
+private:
+    unsigned m_flags;
+};
+
+} // namespace JSC
+
+#endif // RuntimeFlags_h