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diff --git a/Source/JavaScriptCore/bytecode/ExecutableInfo.h b/Source/JavaScriptCore/bytecode/ExecutableInfo.h
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+++ b/Source/JavaScriptCore/bytecode/ExecutableInfo.h
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+/*
+ * Copyright (C) 2012-2015 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 ExecutableInfo_h
+#define ExecutableInfo_h
+
+#include "ParserModes.h"
+
+namespace JSC {
+    
+enum class DerivedContextType : uint8_t { None, DerivedConstructorContext, DerivedMethodContext };
+
+// FIXME: These flags, ParserModes and propagation to XXXCodeBlocks should be reorganized.
+// https://bugs.webkit.org/show_bug.cgi?id=151547
+struct ExecutableInfo {
+    ExecutableInfo(bool usesEval, bool isStrictMode, bool isConstructor, bool isBuiltinFunction, ConstructorKind constructorKind, SuperBinding superBinding, SourceParseMode parseMode, DerivedContextType derivedContextType, bool isArrowFunctionContext, bool isClassContext)
+        : m_usesEval(usesEval)
+        , m_isStrictMode(isStrictMode)
+        , m_isConstructor(isConstructor)
+        , m_isBuiltinFunction(isBuiltinFunction)
+        , m_constructorKind(static_cast<unsigned>(constructorKind))
+        , m_superBinding(static_cast<unsigned>(superBinding))
+        , m_parseMode(parseMode)
+        , m_derivedContextType(static_cast<unsigned>(derivedContextType))
+        , m_isArrowFunctionContext(isArrowFunctionContext)
+        , m_isClassContext(isClassContext)
+    {
+        ASSERT(m_constructorKind == static_cast<unsigned>(constructorKind));
+        ASSERT(m_superBinding == static_cast<unsigned>(superBinding));
+    }
+
+    bool usesEval() const { return m_usesEval; }
+    bool isStrictMode() const { return m_isStrictMode; }
+    bool isConstructor() const { return m_isConstructor; }
+    bool isBuiltinFunction() const { return m_isBuiltinFunction; }
+    ConstructorKind constructorKind() const { return static_cast<ConstructorKind>(m_constructorKind); }
+    SuperBinding superBinding() const { return static_cast<SuperBinding>(m_superBinding); }
+    SourceParseMode parseMode() const { return m_parseMode; }
+    DerivedContextType derivedContextType() const { return static_cast<DerivedContextType>(m_derivedContextType); }
+    bool isArrowFunctionContext() const { return m_isArrowFunctionContext; }
+    bool isClassContext() const { return m_isClassContext; }
+
+private:
+    unsigned m_usesEval : 1;
+    unsigned m_isStrictMode : 1;
+    unsigned m_isConstructor : 1;
+    unsigned m_isBuiltinFunction : 1;
+    unsigned m_constructorKind : 2;
+    unsigned m_superBinding : 1;
+    SourceParseMode m_parseMode;
+    unsigned m_derivedContextType : 2;
+    unsigned m_isArrowFunctionContext : 1;
+    unsigned m_isClassContext : 1;
+};
+
+} // namespace JSC
+
+#endif // ExecutableInfo_h