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diff --git a/gprofng/src/MemorySpace.h b/gprofng/src/MemorySpace.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 _MEMORYSPACE_H
+#define	_MEMORYSPACE_H
+
+#include <stdio.h>
+
+#include "dbe_structs.h"
+#include "vec.h"
+#include "Exp_Layout.h"
+#include "Histable.h"
+#include "Hist_data.h"
+#include "Metric.h"
+#include "HashMap.h"
+
+class Experiment;
+class Expression;
+class DataView;
+class DbeView;
+class MemObj;
+
+class MemObjType_t
+{
+public:
+  MemObjType_t ();
+  ~MemObjType_t ();
+  int type;
+  char *name;
+  char *index_expr;
+  char *machmodel;
+  char mnemonic;
+  char *short_description;
+  char *long_description;
+};
+
+class MemorySpace
+{
+public:
+
+  MemorySpace (DbeView *_dbev, int subtype);
+  ~MemorySpace ();
+
+  void reset (void);
+
+  int
+  getMemObjType (void)
+  {
+    return mstype;
+  }
+
+  char *
+  getMemObjTypeName (void)
+  {
+    return msname;
+  }
+
+  Expression *
+  getMemObjDef (void)
+  {
+    return msindex_exp;
+  }
+
+  // static members, used to define or fetch the various MemorySpaces
+  static void get_filter_keywords (Vector <void*> *res);
+  static Vector<void*> *getMemObjects (void);
+  static void set_MemTabOrder (Vector<int> *);
+  static char *mobj_define (char *, char *, char *, char *, char *);
+  static char *mobj_delete (char *);
+  static MemObjType_t *findMemSpaceByName (const char *mname);
+  static MemObjType_t *findMemSpaceByIndex (int index);
+  static char pickMnemonic (char *name);
+  static Vector<char *> *getMachineModelMemObjs (char *);
+
+private:
+  HashMap<uint64_t, MemObj*> *objs;
+  int findMemObject (uint64_t indx);
+  MemObj *lookupMemObject (Experiment *exp, DataView*, long);
+  MemObj *createMemObject (uint64_t, char *moname);
+
+  int mstype;               // type of this memory space
+  char *msname;             // name of this memory space
+  Expression *msindex_exp;  // index-expression for this memory space
+  char *msindex_exp_str;    // string for index-expression
+  Hist_data *hist_data_all; // the cached data for mode=Hist_Data::ALL
+  uint64_t selected_mo_index; // which page, cacheline, etc.
+  int sel_ind;              // index of selected object in list
+  DbeView *dbev;
+  int phaseIdx;
+  uint64_t idx_min;
+  uint64_t idx_max;
+  MemObj *unk_memobj;
+  MemObj *total_memobj;
+};
+
+#endif /* _MEMORYSPACE_H */