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diff --git a/Source/JavaScriptCore/parser/SourceCodeKey.h b/Source/JavaScriptCore/parser/SourceCodeKey.h
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+++ b/Source/JavaScriptCore/parser/SourceCodeKey.h
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+/*
+ * Copyright (C) 2012 Apple Inc. All Rights Reserved.
+ * Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>
+ *
+ * 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
+
+#include "ParserModes.h"
+#include "UnlinkedSourceCode.h"
+#include <wtf/HashTraits.h>
+
+namespace JSC {
+
+enum class SourceCodeType { EvalType, ProgramType, FunctionType, ModuleType };
+enum class TypeProfilerEnabled { No, Yes };
+enum class ControlFlowProfilerEnabled { No, Yes };
+
+class SourceCodeFlags {
+public:
+    SourceCodeFlags() = default;
+
+    SourceCodeFlags(
+        SourceCodeType codeType, JSParserStrictMode strictMode, JSParserScriptMode scriptMode, 
+        DerivedContextType derivedContextType, EvalContextType evalContextType, bool isArrowFunctionContext,
+        DebuggerMode debuggerMode, TypeProfilerEnabled typeProfilerEnabled, ControlFlowProfilerEnabled controlFlowProfilerEnabled)
+        : m_flags(
+            (static_cast<unsigned>(debuggerMode) << 8) |
+            (static_cast<unsigned>(typeProfilerEnabled) << 7) |
+            (static_cast<unsigned>(controlFlowProfilerEnabled) << 6) |
+            (static_cast<unsigned>(scriptMode) << 5) |
+            (static_cast<unsigned>(isArrowFunctionContext) << 4) |
+            (static_cast<unsigned>(evalContextType) << 3) |
+            (static_cast<unsigned>(derivedContextType) << 2) |
+            (static_cast<unsigned>(codeType) << 1) |
+            (static_cast<unsigned>(strictMode))
+        )
+    {
+    }
+
+    inline bool operator==(const SourceCodeFlags& rhs) const
+    {
+        return m_flags == rhs.m_flags;
+    }
+
+    unsigned bits() { return m_flags; }
+
+private:
+    unsigned m_flags { 0 };
+};
+
+class SourceCodeKey {
+public:
+    SourceCodeKey()
+    {
+    }
+
+    SourceCodeKey(
+        const UnlinkedSourceCode& sourceCode, const String& name, SourceCodeType codeType, JSParserStrictMode strictMode, 
+        JSParserScriptMode scriptMode, DerivedContextType derivedContextType, EvalContextType evalContextType, bool isArrowFunctionContext,
+        DebuggerMode debuggerMode, TypeProfilerEnabled typeProfilerEnabled, ControlFlowProfilerEnabled controlFlowProfilerEnabled)
+            : m_sourceCode(sourceCode)
+            , m_name(name)
+            , m_flags(codeType, strictMode, scriptMode, derivedContextType, evalContextType, isArrowFunctionContext, debuggerMode, typeProfilerEnabled, controlFlowProfilerEnabled)
+            , m_hash(sourceCode.hash() ^ m_flags.bits())
+    {
+    }
+
+    SourceCodeKey(WTF::HashTableDeletedValueType)
+        : m_sourceCode(WTF::HashTableDeletedValue)
+    {
+    }
+
+    bool isHashTableDeletedValue() const { return m_sourceCode.isHashTableDeletedValue(); }
+
+    unsigned hash() const { return m_hash; }
+
+    size_t length() const { return m_sourceCode.length(); }
+
+    bool isNull() const { return m_sourceCode.isNull(); }
+
+    // To save memory, we compute our string on demand. It's expected that source
+    // providers cache their strings to make this efficient.
+    StringView string() const { return m_sourceCode.view(); }
+
+    bool operator==(const SourceCodeKey& other) const
+    {
+        return m_hash == other.m_hash
+            && length() == other.length()
+            && m_flags == other.m_flags
+            && m_name == other.m_name
+            && string() == other.string();
+    }
+
+    struct Hash {
+        static unsigned hash(const SourceCodeKey& key) { return key.hash(); }
+        static bool equal(const SourceCodeKey& a, const SourceCodeKey& b) { return a == b; }
+        static const bool safeToCompareToEmptyOrDeleted = false;
+    };
+
+    struct HashTraits : SimpleClassHashTraits<SourceCodeKey> {
+        static const bool hasIsEmptyValueFunction = true;
+        static bool isEmptyValue(const SourceCodeKey& key) { return key.isNull(); }
+    };
+
+private:
+    UnlinkedSourceCode m_sourceCode;
+    String m_name;
+    SourceCodeFlags m_flags;
+    unsigned m_hash;
+};
+
+} // namespace JSC