1 files changed, 56 insertions, 0 deletions
diff --git a/gdb/common/refcounted-object.h b/gdb/common/refcounted-object.h
new file mode 100644
index 0000000..9d0ac10
--- /dev/null
+++ b/gdb/common/refcounted-object.h
@@ -0,0 +1,56 @@
+/* Base class of intrusively reference-counted objects.
+   Copyright (C) 2017 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   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 of the License, 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, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef REFCOUNTED_OBJECT_H
+#define REFCOUNTED_OBJECT_H
+
+/* Base class of intrusively reference-countable objects.
+   Incrementing and decrementing the reference count is an external
+   responsibility.  */
+
+class refcounted_object
+{
+public:
+  refcounted_object () = default;
+
+  /* Increase the refcount.  */
+  void incref ()
+  {
+    gdb_assert (m_refcount >= 0);
+    m_refcount++;
+  }
+
+  /* Decrease the refcount.  */
+  void decref ()
+  {
+    m_refcount--;
+    gdb_assert (m_refcount >= 0);
+  }
+
+  int refcount () const { return m_refcount; }
+
+private:
+  /* Disable copy.  */
+  refcounted_object (const refcounted_object &) = delete;
+  refcounted_object &operator=(const refcounted_object &) = delete;
+
+  /* The reference count.  */
+  int m_refcount = 0;
+};
+
+#endif /* REFCOUNTED_OBJECT_H */