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diff --git a/Source/JavaScriptCore/wasm/js/JSWebAssemblyCallee.h b/Source/JavaScriptCore/wasm/js/JSWebAssemblyCallee.h
new file mode 100644
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+++ b/Source/JavaScriptCore/wasm/js/JSWebAssemblyCallee.h
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+/*
+ * Copyright (C) 2016 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(WEBASSEMBLY)
+
+#include "JSCell.h"
+#include "RegisterAtOffsetList.h"
+#include "Structure.h"
+#include "WasmFormat.h"
+
+namespace JSC {
+
+class JSWebAssemblyCallee : public JSCell {
+public:
+    typedef JSCell Base;
+    static const unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
+
+    static JSWebAssemblyCallee* create(VM& vm, Wasm::Entrypoint&& entrypoint)
+    {
+        JSWebAssemblyCallee* callee = new (NotNull, allocateCell<JSWebAssemblyCallee>(vm.heap)) JSWebAssemblyCallee(vm);
+        callee->finishCreation(vm, WTFMove(entrypoint));
+        return callee;
+    }
+
+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype) 
+    {
+        return Structure::create(vm, globalObject, prototype, TypeInfo(CellType, StructureFlags), info());
+    }
+
+    DECLARE_EXPORT_INFO;
+    static const bool needsDestruction = true;
+    static void destroy(JSCell*);
+
+    void* entrypoint() { return m_entrypoint.compilation->code().executableAddress(); }
+
+    RegisterAtOffsetList* calleeSaveRegisters() { return &m_entrypoint.calleeSaveRegisters; }
+
+private:
+    void finishCreation(VM&, Wasm::Entrypoint&&);
+    JSWebAssemblyCallee(VM&);
+
+    Wasm::Entrypoint m_entrypoint;
+};
+
+} // namespace JSC
+
+#endif // ENABLE(WEBASSEMBLY)