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diff --git a/Source/JavaScriptCore/domjit/DOMJITEffect.h b/Source/JavaScriptCore/domjit/DOMJITEffect.h
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+++ b/Source/JavaScriptCore/domjit/DOMJITEffect.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
+
+#include "DOMJITHeapRange.h"
+#include <wtf/Optional.h>
+
+namespace JSC { namespace DOMJIT {
+
+class Effect {
+public:
+    HeapRange reads { HeapRange::top() };
+    HeapRange writes { HeapRange::top() };
+    HeapRange def { HeapRange::top() };
+
+    constexpr Effect() = default;
+    constexpr Effect(HeapRange reads, HeapRange writes)
+        : reads(reads)
+        , writes(writes)
+    {
+    }
+
+    constexpr Effect(HeapRange reads, HeapRange writes, HeapRange def)
+        : reads(reads)
+        , writes(writes)
+        , def(def)
+    {
+    }
+
+    constexpr static Effect forWrite(HeapRange writeRange)
+    {
+        return Effect(HeapRange::none(), writeRange);
+    }
+
+    constexpr static Effect forRead(HeapRange readRange)
+    {
+        return Effect(readRange, HeapRange::none());
+    }
+
+    constexpr static Effect forReadWrite(HeapRange readRange, HeapRange writeRange)
+    {
+        return Effect(readRange, writeRange);
+    }
+
+    constexpr static Effect forPure()
+    {
+        return Effect(HeapRange::none(), HeapRange::none(), HeapRange::none());
+    }
+
+    constexpr static Effect forDef(HeapRange def)
+    {
+        return Effect(def, HeapRange::none(), def);
+    }
+
+    constexpr static Effect forDef(HeapRange def, HeapRange readRange, HeapRange writeRange)
+    {
+        return Effect(readRange, writeRange, def);
+    }
+
+    constexpr bool mustGenerate() const
+    {
+        return !!writes;
+    }
+};
+
+} }