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diff --git a/Source/JavaScriptCore/wasm/WASMReader.h b/Source/JavaScriptCore/wasm/WASMReader.h
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+++ b/Source/JavaScriptCore/wasm/WASMReader.h
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+/*
+ * Copyright (C) 2015 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.
+ */
+
+#ifndef WASMReader_h
+#define WASMReader_h
+
+#if ENABLE(WEBASSEMBLY)
+
+#include "WASMConstants.h"
+#include "WASMFormat.h"
+#include <wtf/Vector.h>
+
+namespace JSC {
+
+class WASMReader {
+public:
+    WASMReader(const Vector<uint8_t>& buffer)
+        : m_buffer(buffer)
+        , m_cursor(buffer.data())
+    {
+    }
+
+    unsigned offset() const { return m_cursor - m_buffer.data(); }
+    void setOffset(unsigned offset) { m_cursor = m_buffer.data() + offset; }
+
+    bool readUInt32(uint32_t& result);
+    bool readFloat(float& result);
+    bool readDouble(double& result);
+    bool readCompactInt32(uint32_t& result);
+    bool readCompactUInt32(uint32_t& result);
+    bool readString(String& result);
+    bool readType(WASMType& result);
+    bool readExpressionType(WASMExpressionType& result);
+    bool readExportFormat(WASMExportFormat& result);
+    bool readOpStatement(bool& hasImmediate, WASMOpStatement&, WASMOpStatementWithImmediate&, uint8_t& immediate);
+    bool readOpExpressionI32(bool& hasImmediate, WASMOpExpressionI32&, WASMOpExpressionI32WithImmediate&, uint8_t& immediate);
+    bool readOpExpressionF32(bool& hasImmediate, WASMOpExpressionF32&, WASMOpExpressionF32WithImmediate&, uint8_t& immediate);
+    bool readOpExpressionF64(bool& hasImmediate, WASMOpExpressionF64&, WASMOpExpressionF64WithImmediate&, uint8_t& immediate);
+    bool readOpExpressionVoid(WASMOpExpressionVoid&);
+    bool readVariableTypes(bool& hasImmediate, WASMVariableTypes&, WASMVariableTypesWithImmediate&, uint8_t& immediate);
+    bool readSwitchCase(WASMSwitchCase& result);
+
+private:
+    static const uint32_t firstSevenBitsMask = 0x7f;
+
+    template <class T> bool readByte(T& result, uint8_t numberOfValues);
+    template <class T, class TWithImmediate> bool readOp(bool& hasImmediate, T&, TWithImmediate&, uint8_t& immediate, uint8_t numberOfValues, uint8_t numberOfValuesWithImmediate);
+
+    const Vector<uint8_t>& m_buffer;
+    const uint8_t* m_cursor;
+};
+
+} // namespace JSC
+
+#endif // ENABLE(WEBASSEMBLY)
+
+#endif // WASMReader_h