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diff --git a/Source/JavaScriptCore/parser/SourceProvider.h b/Source/JavaScriptCore/parser/SourceProvider.h
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+/*
+ * Copyright (C) 2008, 2009, 2012, 2013 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.
+ * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE 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 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.
+ */
+
+#ifndef SourceProvider_h
+#define SourceProvider_h
+
+#include <wtf/RefCounted.h>
+#include <wtf/text/TextPosition.h>
+#include <wtf/text/WTFString.h>
+
+namespace JSC {
+
+    class SourceProvider : public RefCounted<SourceProvider> {
+    public:
+        static const intptr_t nullID = 1;
+        
+        JS_EXPORT_PRIVATE SourceProvider(const String& url, const TextPosition& startPosition);
+
+        JS_EXPORT_PRIVATE virtual ~SourceProvider();
+
+        virtual const String& source() const = 0;
+        String getRange(int start, int end) const
+        {
+            return source().substringSharingImpl(start, end - start);
+        }
+
+        const String& url() { return m_url; }
+        TextPosition startPosition() const { return m_startPosition; }
+        intptr_t asID()
+        {
+            if (!m_id)
+                getID();
+            return m_id;
+        }
+
+        bool isValid() const { return m_validated; }
+        void setValid() { m_validated = true; }
+
+    private:
+
+        JS_EXPORT_PRIVATE void getID();
+        Vector<size_t>& lineStarts();
+
+        String m_url;
+        TextPosition m_startPosition;
+        bool m_validated : 1;
+        uintptr_t m_id : sizeof(uintptr_t) * 8 - 1;
+    };
+
+    class StringSourceProvider : public SourceProvider {
+    public:
+        static Ref<StringSourceProvider> create(const String& source, const String& url, const TextPosition& startPosition = TextPosition::minimumPosition())
+        {
+            return adoptRef(*new StringSourceProvider(source, url, startPosition));
+        }
+
+        virtual const String& source() const override
+        {
+            return m_source;
+        }
+
+    private:
+        StringSourceProvider(const String& source, const String& url, const TextPosition& startPosition)
+            : SourceProvider(url, startPosition)
+            , m_source(source)
+        {
+        }
+
+        String m_source;
+    };
+    
+#if ENABLE(WEBASSEMBLY)
+    class WebAssemblySourceProvider : public SourceProvider {
+    public:
+        static Ref<WebAssemblySourceProvider> create(const Vector<uint8_t>& data, const String& url)
+        {
+            return adoptRef(*new WebAssemblySourceProvider(data, url));
+        }
+
+        virtual const String& source() const override
+        {
+            return m_source;
+        }
+
+        const Vector<uint8_t>& data() const
+        {
+            return m_data;
+        }
+
+    private:
+        WebAssemblySourceProvider(const Vector<uint8_t>& data, const String& url)
+            : SourceProvider(url, TextPosition::minimumPosition())
+            , m_source("[WebAssembly source]")
+            , m_data(data)
+        {
+        }
+
+        String m_source;
+        Vector<uint8_t> m_data;
+    };
+#endif
+
+} // namespace JSC
+
+#endif // SourceProvider_h