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diff --git a/Source/JavaScriptCore/heap/HeapSnapshot.h b/Source/JavaScriptCore/heap/HeapSnapshot.h
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+++ b/Source/JavaScriptCore/heap/HeapSnapshot.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 "HeapSnapshotBuilder.h"
+#include "TinyBloomFilter.h"
+#include <wtf/Optional.h>
+
+namespace JSC {
+
+class HeapSnapshot {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    HeapSnapshot(HeapSnapshot*);
+    ~HeapSnapshot();
+
+    HeapSnapshot* previous() const { return m_previous; }
+
+    void appendNode(const HeapSnapshotNode&);
+    void sweepCell(JSCell*);
+    void shrinkToFit();
+    void finalize();
+
+    bool isEmpty() const { return m_nodes.isEmpty(); }
+    std::optional<HeapSnapshotNode> nodeForCell(JSCell*);
+    std::optional<HeapSnapshotNode> nodeForObjectIdentifier(unsigned objectIdentifier);
+
+private:
+    friend class HeapSnapshotBuilder;
+    static const intptr_t CellToSweepTag = 1;
+
+    Vector<HeapSnapshotNode> m_nodes;
+    TinyBloomFilter m_filter;
+    HeapSnapshot* m_previous { nullptr };
+    unsigned m_firstObjectIdentifier { 0 };
+    unsigned m_lastObjectIdentifier { 0 };
+    bool m_finalized { false };
+    bool m_hasCellsToSweep { false };
+};
+
+} // namespace JSC