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diff --git a/Source/JavaScriptCore/runtime/GeneratorFunctionConstructor.cpp b/Source/JavaScriptCore/runtime/GeneratorFunctionConstructor.cpp
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+++ b/Source/JavaScriptCore/runtime/GeneratorFunctionConstructor.cpp
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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.
+ */
+
+#include "config.h"
+#include "GeneratorFunctionConstructor.h"
+
+#include "FunctionConstructor.h"
+#include "GeneratorFunctionPrototype.h"
+#include "JSCInlines.h"
+
+namespace JSC {
+
+STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(GeneratorFunctionConstructor);
+
+const ClassInfo GeneratorFunctionConstructor::s_info = { "GeneratorFunction", &Base::s_info, nullptr, CREATE_METHOD_TABLE(GeneratorFunctionConstructor) };
+
+GeneratorFunctionConstructor::GeneratorFunctionConstructor(VM& vm, Structure* structure)
+    : InternalFunction(vm, structure)
+{
+}
+
+void GeneratorFunctionConstructor::finishCreation(VM& vm, GeneratorFunctionPrototype* generatorFunctionPrototype)
+{
+    Base::finishCreation(vm, "GeneratorFunction");
+    putDirectWithoutTransition(vm, vm.propertyNames->prototype, generatorFunctionPrototype, DontEnum | DontDelete | ReadOnly);
+
+    // Number of arguments for constructor
+    putDirectWithoutTransition(vm, vm.propertyNames->length, jsNumber(1), ReadOnly | DontEnum);
+}
+
+static EncodedJSValue JSC_HOST_CALL callGeneratorFunctionConstructor(ExecState* exec)
+{
+    ArgList args(exec);
+    return JSValue::encode(constructFunction(exec, asInternalFunction(exec->jsCallee())->globalObject(), args, FunctionConstructionMode::Generator));
+}
+
+static EncodedJSValue JSC_HOST_CALL constructGeneratorFunctionConstructor(ExecState* exec)
+{
+    ArgList args(exec);
+    return JSValue::encode(constructFunction(exec, asInternalFunction(exec->jsCallee())->globalObject(), args, FunctionConstructionMode::Generator, exec->newTarget()));
+}
+
+CallType GeneratorFunctionConstructor::getCallData(JSCell*, CallData& callData)
+{
+    callData.native.function = callGeneratorFunctionConstructor;
+    return CallType::Host;
+}
+
+ConstructType GeneratorFunctionConstructor::getConstructData(JSCell*, ConstructData& constructData)
+{
+    constructData.native.function = constructGeneratorFunctionConstructor;
+    return ConstructType::Host;
+}
+
+} // namespace JSC