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diff --git a/gprofng/src/HeapActivity.h b/gprofng/src/HeapActivity.h
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+/* Copyright (C) 2021 Free Software Foundation, Inc.
+   Contributed by Oracle.
+
+   This file is part of GNU Binutils.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, 51 Franklin Street - Fifth Floor, Boston,
+   MA 02110-1301, USA.  */
+
+#ifndef _HEAPACTIVITY_H
+#define _HEAPACTIVITY_H
+
+
+#include <stdio.h>
+
+#include "vec.h"
+#include "Histable.h"
+#include "Hist_data.h"
+#include "Metric.h"
+#include "HeapData.h"
+#include "DefaultMap.h"
+#include "dbe_types.h"
+
+class Experiment;
+class Expression;
+class DataView;
+class DbeView;
+
+class HeapActivity
+{
+public:
+
+  HeapActivity (DbeView *_dbev);
+
+  ~HeapActivity ()
+  {
+    this->reset ();
+  }
+
+  void reset (void);
+  Hist_data *compute_metrics (MetricList *, Histable::Type,
+			      Hist_data::Mode, Histable*);
+
+private:
+
+  void computeCallStack (Histable::Type, VMode viewMode);
+  void createHistItemTotals (Hist_data *, MetricList *, Histable::Type, bool);
+  void computeHistTotals (Hist_data *, MetricList *);
+  void computeHistData (Hist_data *, MetricList *, Hist_data::Mode, Histable *);
+
+  Vector<HeapData*> *hDataObjs;
+  Vector<HeapData*> *hDataObjsCallStack;
+  bool hasCallStack;
+  HeapData *hDataTotal;
+
+  // list of HeapData objects using the stack id as the key
+  DefaultMap<uint64_t, HeapData*> *hDataCalStkMap;
+
+  // the cached data for mode=Hist_Data::ALL
+  Hist_data *hist_data_callstack_all;
+
+  DbeView *dbev;
+};
+
+#endif /* _HEAPACTIVITY_H */