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diff --git a/Source/JavaScriptCore/wasm/js/JSWebAssemblyHelpers.h b/Source/JavaScriptCore/wasm/js/JSWebAssemblyHelpers.h
new file mode 100644
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+++ b/Source/JavaScriptCore/wasm/js/JSWebAssemblyHelpers.h
@@ -0,0 +1,76 @@
+/*
+ * 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 "JSArrayBuffer.h"
+#include "JSCJSValue.h"
+
+namespace JSC {
+
+ALWAYS_INLINE uint32_t toNonWrappingUint32(ExecState* exec, JSValue value)
+{
+    VM& vm = exec->vm();
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    double doubleValue = value.toInteger(exec);
+    RETURN_IF_EXCEPTION(throwScope, { });
+    if (doubleValue < 0 || doubleValue > UINT_MAX) {
+        throwException(exec, throwScope,
+            createRangeError(exec, ASCIILiteral("Expect an integer argument in the range: [0, 2^32 - 1]")));
+        return { };
+    }
+
+    return static_cast<uint32_t>(doubleValue);
+}
+
+ALWAYS_INLINE uint8_t* getWasmBufferFromValue(ExecState* exec, JSValue value, size_t& byteOffset, size_t& byteSize)
+{
+    VM& vm = exec->vm();
+    auto throwScope = DECLARE_THROW_SCOPE(vm);
+    // If the given bytes argument is not a BufferSource, a TypeError exception is thrown.
+    JSArrayBuffer* arrayBuffer = value.getObject() ? jsDynamicCast<JSArrayBuffer*>(vm, value.getObject()) : nullptr;
+    JSArrayBufferView* arrayBufferView = value.getObject() ? jsDynamicCast<JSArrayBufferView*>(vm, value.getObject()) : nullptr;
+    if (!(arrayBuffer || arrayBufferView)) {
+        throwException(exec, throwScope, createTypeError(exec,
+            ASCIILiteral("first argument must be an ArrayBufferView or an ArrayBuffer"), defaultSourceAppender, runtimeTypeForValue(value)));
+        return nullptr;
+    }
+
+    if (arrayBufferView ? arrayBufferView->isNeutered() : arrayBuffer->impl()->isNeutered()) {
+        throwException(exec, throwScope, createTypeError(exec,
+            ASCIILiteral("underlying TypedArray has been detatched from the ArrayBuffer"), defaultSourceAppender, runtimeTypeForValue(value)));
+        return nullptr;
+    }
+
+    byteOffset = arrayBufferView ? arrayBufferView->byteOffset() : 0;
+    byteSize = arrayBufferView ? arrayBufferView->length() : arrayBuffer->impl()->byteLength();
+    return arrayBufferView ? static_cast<uint8_t*>(arrayBufferView->vector()) : static_cast<uint8_t*>(arrayBuffer->impl()->data());
+}
+
+} // namespace JSC
+
+#endif // ENABLE(WEBASSEMBLY)