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diff --git a/Source/JavaScriptCore/interpreter/CLoopStack.h b/Source/JavaScriptCore/interpreter/CLoopStack.h
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+/*
+ * Copyright (C) 2008-2009, 2013-2014, 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.
+ * 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.
+ */
+
+#pragma once
+
+#if !ENABLE(JIT)
+
+#include "Register.h"
+#include <wtf/Noncopyable.h>
+#include <wtf/PageReservation.h>
+#include <wtf/VMTags.h>
+
+namespace JSC {
+
+    class CodeBlockSet;
+    class ConservativeRoots;
+    class JITStubRoutineSet;
+    class VM;
+    class LLIntOffsetsExtractor;
+
+    class CLoopStack {
+        WTF_MAKE_NONCOPYABLE(CLoopStack);
+    public:
+        // Allow 8k of excess registers before we start trying to reap the stack
+        static const ptrdiff_t maxExcessCapacity = 8 * 1024;
+
+        CLoopStack(VM&);
+        ~CLoopStack();
+        
+        bool ensureCapacityFor(Register* newTopOfStack);
+
+        bool containsAddress(Register* address) { return (lowAddress() <= address && address < highAddress()); }
+        static size_t committedByteCount();
+
+        void gatherConservativeRoots(ConservativeRoots&, JITStubRoutineSet&, CodeBlockSet&);
+        void sanitizeStack();
+
+        Register* baseOfStack() const
+        {
+            return highAddress() - 1;
+        }
+
+        size_t size() const { return highAddress() - lowAddress(); }
+
+        void setSoftReservedZoneSize(size_t);
+        bool isSafeToRecurse() const;
+        inline Register* topOfStack();
+
+    private:
+
+        Register* lowAddress() const
+        {
+            return m_end + 1;
+        }
+
+        Register* highAddress() const
+        {
+            return reinterpret_cast_ptr<Register*>(static_cast<char*>(m_reservation.base()) + m_reservation.size());
+        }
+
+        inline Register* topOfFrameFor(CallFrame*);
+
+        Register* reservationTop() const
+        {
+            char* reservationTop = static_cast<char*>(m_reservation.base());
+            return reinterpret_cast_ptr<Register*>(reservationTop);
+        }
+
+        bool grow(Register* newTopOfStack);
+        void shrink(Register* newTopOfStack);
+        void releaseExcessCapacity();
+        void addToCommittedByteCount(long);
+
+        void setCLoopStackLimit(Register* newTopOfStack);
+
+        VM& m_vm;
+        CallFrame*& m_topCallFrame;
+        Register* m_end;
+        Register* m_commitTop;
+        PageReservation m_reservation;
+        Register* m_lastStackTop;
+        ptrdiff_t m_softReservedZoneSizeInRegisters;
+
+        friend class LLIntOffsetsExtractor;
+    };
+
+} // namespace JSC
+
+#endif // !ENABLE(JIT)