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diff --git a/gcc/hash-map-traits.h b/gcc/hash-map-traits.h
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+/* A hash map traits.
+   Copyright (C) 2015 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC 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.
+
+GCC 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 GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef HASH_MAP_TRAITS_H
+#define HASH_MAP_TRAITS_H
+
+/* Bacause mem-stats.h uses default hashmap traits, we have to
+   put the class to this separate header file.  */
+
+/* implement default behavior for traits when types allow it.  */
+
+struct default_hashmap_traits
+{
+  /* Hashes the passed in key.  */
+
+  template<typename T>
+  static hashval_t
+  hash (T *p)
+    {
+      return uintptr_t (p) >> 3;
+    }
+
+  /* If the value converts to hashval_t just use it.  */
+
+  template<typename T> static hashval_t hash (T v) { return v; }
+
+  /* Return true if the two keys passed as arguments are equal.  */
+
+  template<typename T>
+  static bool
+  equal_keys (const T &a, const T &b)
+    {
+      return a == b;
+    }
+
+  /* Called to dispose of the key and value before marking the entry as
+     deleted.  */
+
+  template<typename T> static void remove (T &v) { v.~T (); }
+
+  /* Mark the passed in entry as being deleted.  */
+
+  template<typename T>
+  static void
+  mark_deleted (T &e)
+    {
+      mark_key_deleted (e.m_key);
+    }
+
+  /* Mark the passed in entry as being empty.  */
+
+  template<typename T>
+  static void
+  mark_empty (T &e)
+    {
+      mark_key_empty (e.m_key);
+    }
+
+  /* Return true if the passed in entry is marked as deleted.  */
+
+  template<typename T>
+  static bool
+  is_deleted (T &e)
+    {
+      return e.m_key == (void *)1;
+    }
+
+  /* Return true if the passed in entry is marked as empty.  */
+
+  template<typename T> static bool is_empty (T &e) { return e.m_key == NULL; }
+
+private:
+  template<typename T>
+  static void
+  mark_key_deleted (T *&k)
+    {
+      k = reinterpret_cast<T *> (1);
+    }
+
+  template<typename T>
+  static void
+  mark_key_empty (T *&k)
+    {
+      k = static_cast<T *> (0);
+    }
+};
+
+#endif // HASH_MAP_TRAITS_H