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diff --git a/Source/JavaScriptCore/runtime/JSGeneratorFunction.h b/Source/JavaScriptCore/runtime/JSGeneratorFunction.h
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+++ b/Source/JavaScriptCore/runtime/JSGeneratorFunction.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.
+ */
+
+#pragma once
+
+#include "JSFunction.h"
+
+namespace JSC {
+
+class JSGlobalObject;
+class LLIntOffsetsExtractor;
+class LLIntDesiredOffsets;
+
+class JSGeneratorFunction : public JSFunction {
+    friend class JIT;
+#if ENABLE(DFG_JIT)
+    friend class DFG::SpeculativeJIT;
+    friend class DFG::JITCompiler;
+#endif
+    friend class VM;
+public:
+    typedef JSFunction Base;
+
+    enum class GeneratorResumeMode : int32_t {
+        NormalMode = 0,
+        ReturnMode = 1,
+        ThrowMode = 2
+    };
+
+    enum class GeneratorState : int32_t {
+        Completed = -1,
+        Executing = -2,
+    };
+
+    // [this], @generator, @generatorState, @generatorValue, @generatorResumeMode, @generatorFrame.
+    enum class GeneratorArgument : int32_t {
+        ThisValue = 0,
+        Generator = 1,
+        State = 2,
+        Value = 3,
+        ResumeMode = 4,
+        Frame = 5,
+    };
+
+    const static unsigned StructureFlags = Base::StructureFlags;
+
+    DECLARE_EXPORT_INFO;
+
+    static JSGeneratorFunction* create(VM&, FunctionExecutable*, JSScope*);
+    static JSGeneratorFunction* create(VM&, FunctionExecutable*, JSScope*, Structure*);
+    static JSGeneratorFunction* createWithInvalidatedReallocationWatchpoint(VM&, FunctionExecutable*, JSScope*);
+
+    static size_t allocationSize(size_t inlineCapacity)
+    {
+        ASSERT_UNUSED(inlineCapacity, !inlineCapacity);
+        return sizeof(JSGeneratorFunction);
+    }
+
+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
+    {
+        ASSERT(globalObject);
+        return Structure::create(vm, globalObject, prototype, TypeInfo(JSFunctionType, StructureFlags), info());
+    }
+
+private:
+    JSGeneratorFunction(VM&, FunctionExecutable*, JSScope*, Structure*);
+
+    static JSGeneratorFunction* createImpl(VM&, FunctionExecutable*, JSScope*, Structure*);
+
+    friend class LLIntOffsetsExtractor;
+};
+
+} // namespace JSC