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diff --git a/Source/JavaScriptCore/b3/B3MemoryValue.h b/Source/JavaScriptCore/b3/B3MemoryValue.h
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+++ b/Source/JavaScriptCore/b3/B3MemoryValue.h
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+/*
+ * Copyright (C) 2015-2016 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 "B3HeapRange.h"
+#include "B3Value.h"
+
+namespace JSC { namespace B3 {
+
+// FIXME: We want to allow fenced memory accesses on ARM.
+// https://bugs.webkit.org/show_bug.cgi?id=162349
+
+class JS_EXPORT_PRIVATE MemoryValue : public Value {
+public:
+    static bool accepts(Kind kind)
+    {
+        switch (kind.opcode()) {
+        case Load8Z:
+        case Load8S:
+        case Load16Z:
+        case Load16S:
+        case Load:
+        case Store8:
+        case Store16:
+        case Store:
+            return true;
+        default:
+            return false;
+        }
+    }
+
+    static bool isStore(Kind kind)
+    {
+        switch (kind.opcode()) {
+        case Store8:
+        case Store16:
+        case Store:
+            return true;
+        default:
+            return false;
+        }
+    }
+
+    static bool isLoad(Kind kind)
+    {
+        return accepts(kind) && !isStore(kind);
+    }
+
+    ~MemoryValue();
+
+    int32_t offset() const { return m_offset; }
+    void setOffset(int32_t offset) { m_offset = offset; }
+
+    const HeapRange& range() const { return m_range; }
+    void setRange(const HeapRange& range) { m_range = range; }
+
+    bool isStore() const { return type() == Void; }
+    bool isLoad() const { return type() != Void; }
+
+    size_t accessByteSize() const;
+
+protected:
+    void dumpMeta(CommaPrinter& comma, PrintStream&) const override;
+
+    Value* cloneImpl() const override;
+
+private:
+    friend class Procedure;
+
+    // Use this form for Load (but not Load8Z, Load8S, or any of the Loads that have a suffix that
+    // describes the returned type).
+    MemoryValue(Kind kind, Type type, Origin origin, Value* pointer, int32_t offset = 0)
+        : Value(CheckedOpcode, kind, type, origin, pointer)
+        , m_offset(offset)
+        , m_range(HeapRange::top())
+    {
+        if (!ASSERT_DISABLED) {
+            switch (kind.opcode()) {
+            case Load:
+                break;
+            case Load8Z:
+            case Load8S:
+            case Load16Z:
+            case Load16S:
+                ASSERT(type == Int32);
+                break;
+            case Store8:
+            case Store16:
+            case Store:
+                ASSERT(type == Void);
+                break;
+            default:
+                ASSERT_NOT_REACHED();
+            }
+        }
+    }
+
+    // Use this form for loads where the return type is implied.
+    MemoryValue(Kind kind, Origin origin, Value* pointer, int32_t offset = 0)
+        : MemoryValue(kind, Int32, origin, pointer, offset)
+    {
+    }
+
+    // Use this form for stores.
+    MemoryValue(Kind kind, Origin origin, Value* value, Value* pointer, int32_t offset = 0)
+        : Value(CheckedOpcode, kind, Void, origin, value, pointer)
+        , m_offset(offset)
+        , m_range(HeapRange::top())
+    {
+        if (!ASSERT_DISABLED) {
+            switch (kind.opcode()) {
+            case Store8:
+            case Store16:
+            case Store:
+                break;
+            default:
+                ASSERT_NOT_REACHED();
+                break;
+            }
+        }
+    }
+
+    int32_t m_offset { 0 };
+    HeapRange m_range;
+};
+
+} } // namespace JSC::B3
+
+#endif // ENABLE(B3_JIT)