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diff --git a/Source/JavaScriptCore/runtime/GeneratorFrame.h b/Source/JavaScriptCore/runtime/GeneratorFrame.h
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+++ b/Source/JavaScriptCore/runtime/GeneratorFrame.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 GeneratorFrame_h
+#define GeneratorFrame_h
+
+#include "JSCell.h"
+#include <wtf/FastBitVector.h>
+
+namespace JSC {
+
+class GeneratorFrame : public JSCell {
+    friend class JIT;
+#if ENABLE(DFG_JIT)
+    friend class DFG::SpeculativeJIT;
+    friend class DFG::JITCompiler;
+#endif
+    friend class VM;
+public:
+    typedef JSCell Base;
+    static const unsigned StructureFlags = StructureIsImmortal | Base::StructureFlags;
+
+    DECLARE_EXPORT_INFO;
+
+    static GeneratorFrame* create(VM&, size_t numberOfCalleeLocals);
+
+    WriteBarrierBase<Unknown>* locals()
+    {
+        return bitwise_cast<WriteBarrierBase<Unknown>*>(bitwise_cast<char*>(this) + offsetOfLocals());
+    }
+
+    WriteBarrierBase<Unknown>& localAt(size_t index)
+    {
+        ASSERT(index < m_numberOfCalleeLocals);
+        return locals()[index];
+    }
+
+    static size_t offsetOfLocals()
+    {
+        return WTF::roundUpToMultipleOf<sizeof(WriteBarrier<Unknown>)>(sizeof(GeneratorFrame));
+    }
+
+    static size_t allocationSizeForLocals(unsigned numberOfLocals)
+    {
+        return offsetOfLocals() + numberOfLocals * sizeof(WriteBarrier<Unknown>);
+    }
+
+    static Structure* createStructure(VM&, JSGlobalObject*, JSValue prototype);
+
+    void save(ExecState*, const FastBitVector& liveCalleeLocals);
+    void resume(ExecState*, const FastBitVector& liveCalleeLocals);
+
+private:
+    GeneratorFrame(VM&, size_t numberOfCalleeLocals);
+
+    size_t m_numberOfCalleeLocals;
+
+    friend class LLIntOffsetsExtractor;
+
+    void finishCreation(VM&);
+
+protected:
+    static void visitChildren(JSCell*, SlotVisitor&);
+};
+
+} // namespace JSC
+
+#endif // GeneratorFrame_h