| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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 -- |
| -- -- |
| -- $Revision: 1.8 $ -- |
| -- -- |
| -- Copyright (C) 1992,1993,1994 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, 59 Temple Place - Suite 330, Boston, -- |
| -- MA 02111-1307, 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. -- |
| -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| 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 Left + To_Address (Right); |
| end "+"; |
| |
| function "+" (Left : Storage_Offset; Right : Address) return Address is |
| begin |
| return To_Address (Left) + Right; |
| end "+"; |
| |
| function "-" (Left : Address; Right : Storage_Offset) return Address is |
| begin |
| return Left - To_Address (Right); |
| end "-"; |
| |
| function "-" (Left, Right : Address) return Storage_Offset is |
| begin |
| return To_Offset (Left - Right); |
| end "-"; |
| |
| function "mod" (Left : Address; Right : Storage_Offset) |
| return Storage_Offset is |
| begin |
| if Right >= 0 then |
| return Storage_Offset (Address'(Left mod Address (Right))); |
| else |
| return -Storage_Offset (Address'(Left mod 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; |
