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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- S Y S T E M . S T O R A G E _ E L E M E N T S --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 1992-2005, 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 2, 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. See the GNU General Public License --
+-- for more details. You should have received a copy of the GNU General --
+-- Public License distributed with GNAT; see file COPYING. If not, write --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, USA. --
+-- --
+-- As a special exception, if other files instantiate generics from this --
+-- unit, or you link this unit with other files to produce an executable, --
+-- this unit does not by itself cause the resulting executable to be --
+-- covered by the GNU General Public License. This exception does not --
+-- however invalidate any other reasons why the executable file might be --
+-- covered by the GNU Public License. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+with Unchecked_Conversion;
+package body System.Storage_Elements is
+
+ pragma Suppress (All_Checks);
+
+ function To_Address is new Unchecked_Conversion (Storage_Offset, Address);
+ function To_Offset is new Unchecked_Conversion (Address, Storage_Offset);
+
+ -- Address arithmetic
+
+ function "+" (Left : Address; Right : Storage_Offset) return Address is
+ begin
+ return To_Address (To_Integer (Left) + To_Integer (To_Address (Right)));
+ end "+";
+
+ function "+" (Left : Storage_Offset; Right : Address) return Address is
+ begin
+ return To_Address (To_Integer (To_Address (Left)) + To_Integer (Right));
+ end "+";
+
+ function "-" (Left : Address; Right : Storage_Offset) return Address is
+ begin
+ return To_Address (To_Integer (Left) - To_Integer (To_Address (Right)));
+ end "-";
+
+ function "-" (Left, Right : Address) return Storage_Offset is
+ begin
+ return To_Offset (To_Address (To_Integer (Left) - To_Integer (Right)));
+ end "-";
+
+ function "mod"
+ (Left : Address;
+ Right : Storage_Offset) return Storage_Offset
+ is
+ begin
+ if Right >= 0 then
+ return Storage_Offset
+ (To_Integer (Left) mod Integer_Address (Right));
+ else
+ return -Storage_Offset
+ ((-To_Integer (Left)) mod Integer_Address (-Right));
+ end if;
+ end "mod";
+
+ -- Conversion to/from integers
+
+ function To_Address (Value : Integer_Address) return Address is
+ begin
+ return Address (Value);
+ end To_Address;
+
+ function To_Integer (Value : Address) return Integer_Address is
+ begin
+ return Integer_Address (Value);
+ end To_Integer;
+
+end System.Storage_Elements;