89 lines
4.0 KiB
Ada
89 lines
4.0 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- S Y S T E M . S T O R A G E _ E L E M E N T S --
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-- --
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-- B o d y --
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-- --
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-- $Revision: 1.8 $ --
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-- --
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-- Copyright (C) 1992,1993,1994 Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
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-- --
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------------------------------------------------------------------------------
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with Unchecked_Conversion;
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package body System.Storage_Elements is
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pragma Suppress (All_Checks);
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function To_Address is new Unchecked_Conversion (Storage_Offset, Address);
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function To_Offset is new Unchecked_Conversion (Address, Storage_Offset);
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-- Address arithmetic
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function "+" (Left : Address; Right : Storage_Offset) return Address is
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begin
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return Left + To_Address (Right);
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end "+";
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function "+" (Left : Storage_Offset; Right : Address) return Address is
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begin
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return To_Address (Left) + Right;
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end "+";
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function "-" (Left : Address; Right : Storage_Offset) return Address is
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begin
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return Left - To_Address (Right);
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end "-";
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function "-" (Left, Right : Address) return Storage_Offset is
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begin
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return To_Offset (Left - Right);
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end "-";
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function "mod" (Left : Address; Right : Storage_Offset)
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return Storage_Offset is
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begin
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if Right >= 0 then
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return Storage_Offset (Address'(Left mod Address (Right)));
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else
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return -Storage_Offset (Address'(Left mod Address (-Right)));
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end if;
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end "mod";
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-- Conversion to/from integers
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function To_Address (Value : Integer_Address) return Address is
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begin
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return Address (Value);
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end To_Address;
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function To_Integer (Value : Address) return Integer_Address is
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begin
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return Integer_Address (Value);
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end To_Integer;
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end System.Storage_Elements;
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