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diff --git a/Source/JavaScriptCore/wasm/js/WebAssemblyFunction.h b/Source/JavaScriptCore/wasm/js/WebAssemblyFunction.h
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+++ b/Source/JavaScriptCore/wasm/js/WebAssemblyFunction.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 "JSFunction.h"
+#include "JSWebAssemblyCallee.h"
+#include <wtf/Noncopyable.h>
+
+namespace JSC {
+
+class JSGlobalObject;
+struct ProtoCallFrame;
+class WebAssemblyInstance;
+
+namespace B3 {
+class Compilation;
+}
+
+class WebAssemblyFunction : public JSFunction {
+public:
+    typedef JSFunction Base;
+
+    const static unsigned StructureFlags = Base::StructureFlags;
+
+    DECLARE_EXPORT_INFO;
+
+    JS_EXPORT_PRIVATE static WebAssemblyFunction* create(VM&, JSGlobalObject*, unsigned, const String&, JSWebAssemblyInstance*, JSWebAssemblyCallee* jsEntrypoint, JSWebAssemblyCallee* wasmEntrypoint, Wasm::SignatureIndex);
+    static Structure* createStructure(VM&, JSGlobalObject*, JSValue);
+
+    JSWebAssemblyInstance* instance() const { return m_instance.get(); }
+    Wasm::SignatureIndex signatureIndex() const { return m_signatureIndex; }
+    void* wasmEntrypoint() { return m_wasmEntryPointCode; }
+    void* jsEntrypoint() { return m_jsEntrypoint->entrypoint(); }
+
+    static ptrdiff_t offsetOfInstance() { return OBJECT_OFFSETOF(WebAssemblyFunction, m_instance); }
+    static ptrdiff_t offsetOfWasmEntryPointCode() { return OBJECT_OFFSETOF(WebAssemblyFunction, m_wasmEntryPointCode); }
+
+protected:
+    static void visitChildren(JSCell*, SlotVisitor&);
+
+    void finishCreation(VM&, NativeExecutable*, unsigned length, const String& name, JSWebAssemblyInstance*, JSWebAssemblyCallee* jsEntrypoint, JSWebAssemblyCallee* wasmEntrypoint);
+
+private:
+    WebAssemblyFunction(VM&, JSGlobalObject*, Structure*, JSWebAssemblyCallee*, Wasm::SignatureIndex);
+
+    WriteBarrier<JSWebAssemblyInstance> m_instance;
+    void* m_wasmEntryPointCode; // Cache code pointer: allows the wasm -> wasm stub to do a single load and jump instead of having dependent loads.
+    WriteBarrier<JSWebAssemblyCallee> m_jsEntrypoint;
+    WriteBarrier<JSWebAssemblyCallee> m_wasmEntrypoint;
+    Wasm::SignatureIndex m_signatureIndex;
+};
+
+} // namespace JSC
+
+#endif // ENABLE(WEBASSEMBLY)