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diff --git a/Source/JavaScriptCore/b3/B3StackSlot.h b/Source/JavaScriptCore/b3/B3StackSlot.h
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+++ b/Source/JavaScriptCore/b3/B3StackSlot.h
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+/*
+ * Copyright (C) 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.
+ *
+ * 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
+
+#if ENABLE(B3_JIT)
+
+#include "B3SparseCollection.h"
+#include <limits.h>
+#include <wtf/FastMalloc.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/PrintStream.h>
+
+namespace JSC { namespace B3 {
+
+class Procedure;
+
+namespace Air {
+class StackSlot;
+} // namespace Air
+
+class StackSlot {
+    WTF_MAKE_NONCOPYABLE(StackSlot);
+    WTF_MAKE_FAST_ALLOCATED;
+
+public:
+    ~StackSlot();
+
+    unsigned byteSize() const { return m_byteSize; }
+    unsigned index() const { return m_index; }
+
+    // This gets assigned at the end of compilation. But, you can totally pin stack slots. Use the
+    // set method to do that.
+    intptr_t offsetFromFP() const { return m_offsetFromFP; }
+
+    // Note that this is meaningless unless the stack slot is Locked.
+    void setOffsetFromFP(intptr_t value)
+    {
+        m_offsetFromFP = value;
+    }
+
+    void dump(PrintStream&) const;
+    void deepDump(PrintStream&) const;
+
+private:
+    friend class Air::StackSlot;
+    friend class Procedure;
+    friend class SparseCollection<StackSlot>;
+
+    StackSlot(unsigned byteSize);
+
+    unsigned m_index { UINT_MAX };
+    unsigned m_byteSize { 0 };
+    intptr_t m_offsetFromFP { 0 };
+};
+
+class DeepStackSlotDump {
+public:
+    DeepStackSlotDump(const StackSlot* slot)
+        : m_slot(slot)
+    {
+    }
+
+    void dump(PrintStream& out) const
+    {
+        if (m_slot)
+            m_slot->deepDump(out);
+        else
+            out.print("<null>");
+    }
+
+private:
+    const StackSlot* m_slot;
+};
+
+inline DeepStackSlotDump deepDump(const StackSlot* slot)
+{
+    return DeepStackSlotDump(slot);
+}
+
+} } // namespace JSC::B3
+
+#endif // ENABLE(B3_JIT)