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diff --git a/Source/JavaScriptCore/domjit/DOMJITAbstractHeap.h b/Source/JavaScriptCore/domjit/DOMJITAbstractHeap.h
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+++ b/Source/JavaScriptCore/domjit/DOMJITAbstractHeap.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/Vector.h>
+#include <wtf/text/WTFString.h>
+
+#if ENABLE(JIT)
+
+namespace JSC { namespace DOMJIT {
+
+class AbstractHeap {
+public:
+    AbstractHeap(const String& name)
+        : m_name(name)
+    {
+    }
+
+    void setParent(AbstractHeap* parent)
+    {
+        ASSERT(!m_parent);
+        parent->m_children.append(this);
+        m_parent = parent;
+    }
+
+    bool isRoot() const { return !m_parent; }
+
+    JS_EXPORT_PRIVATE void compute(unsigned begin);
+
+    bool isComputed() const { return !!m_range; }
+    HeapRange range() const { return m_range; }
+
+    JS_EXPORT_PRIVATE void dump(PrintStream&) const;
+    JS_EXPORT_PRIVATE void shallowDump(PrintStream&) const;
+    JS_EXPORT_PRIVATE void deepDump(PrintStream&, unsigned indent = 0) const;
+
+private:
+    String m_name;
+    AbstractHeap* m_parent { nullptr };
+    Vector<AbstractHeap*> m_children { };
+    HeapRange m_range;
+};
+
+} }
+
+#endif