--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/s-chepoo.ads	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,59 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                 S Y S T E M . C H E C K E D _ P O O L S                  --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--          Copyright (C) 1992-2017, Free Software Foundation, Inc.         --
+--                                                                          --
+-- GNAT is free software;  you can  redistribute it  and/or modify it under --
+-- terms of the  GNU General Public License as published  by the Free Soft- --
+-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
+-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
+--                                                                          --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception,   --
+-- version 3.1, as published by the Free Software Foundation.               --
+--                                                                          --
+-- You should have received a copy of the GNU General Public License and    --
+-- a copy of the GCC Runtime Library Exception along with this program;     --
+-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
+-- <http://www.gnu.org/licenses/>.                                          --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+with System.Storage_Elements;
+with System.Storage_Pools;
+
+package System.Checked_Pools is
+
+   type Checked_Pool is abstract
+     new System.Storage_Pools.Root_Storage_Pool with private;
+   --  Equivalent of storage pools with the addition that Dereference is
+   --  called on each implicit or explicit dereference of a pointer which
+   --  has such a storage pool.
+
+   procedure Dereference
+     (Pool                     : in out Checked_Pool;
+      Storage_Address          : Address;
+      Size_In_Storage_Elements : System.Storage_Elements.Storage_Count;
+      Alignment                : System.Storage_Elements.Storage_Count)
+   is abstract;
+   --  Called implicitly each time a pointer to a checked pool is dereferenced
+   --  All parameters in the profile are compatible with the profile of
+   --  Allocate/Deallocate: the Storage_Address corresponds to the address of
+   --  the dereferenced object, Size_in_Storage_Elements is its dynamic size
+   --  (and thus may involve an implicit dispatching call to size) and
+   --  Alignment is the alignment of the object.
+
+private
+   type Checked_Pool is abstract
+     new System.Storage_Pools.Root_Storage_Pool with null record;
+end System.Checked_Pools;