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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              --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 2002-2009, Free Software Foundation, Inc.         --

--                                                                          --

-- This specification is derived from the Ada Reference Manual for use with --

-- GNAT. The copyright notice above, and the license provisions that follow --

-- apply solely to the implementation dependent sections of this file.      --

--                                                                          --

-- 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.      --

--                                                                          --

------------------------------------------------------------------------------

--  Warning: declarations in this package are ambiguous with respect to the

--  extra declarations that can be introduced into System using Extend_System.

--  It is a good idea to avoid use clauses for this package!

pragma Compiler_Unit;

package System.Storage_Elements is

   pragma Pure;

   --  Note that we take advantage of the implementation permission to make

   --  this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada 2005,

   --  this is Pure in any case (AI-362).

   --  We also add the pragma Pure_Function to the operations in this package,

   --  because otherwise functions with parameters derived from Address are

   --  treated as non-pure by the back-end (see exp_ch6.adb). This is because

   --  in many cases such a parameter is used to hide read/out access to

   --  objects, and it would be unsafe to treat such functions as pure.

   type Storage_Offset is range

     -(2 ** (Integer'(Standard'Address_Size) - 1)) ..

     +(2 ** (Integer'(Standard'Address_Size) - 1)) - Long_Long_Integer'(1);

   --  Note: the reason for the Long_Long_Integer qualification here is to

   --  avoid a bogus ambiguity when this unit is analyzed in an rtsfind

   --  context. It may be possible to remove this in the future, but it is

   --  certainly harmless in any case ???

   subtype Storage_Count is Storage_Offset range 0 .. Storage_Offset'Last;

   type Storage_Element is mod 2 ** Storage_Unit;

   for Storage_Element'Size use Storage_Unit;

   pragma Universal_Aliasing (Storage_Element);

   --  This type is used by the expander to implement aggregate copy

   type Storage_Array is

     array (Storage_Offset range <>) of aliased Storage_Element;

   for Storage_Array'Component_Size use Storage_Unit;

   --  Address arithmetic

   function "+" (Left : Address; Right : Storage_Offset) return Address;

   pragma Convention (Intrinsic, "+");

   pragma Inline_Always ("+");

   pragma Pure_Function ("+");

   function "+" (Left : Storage_Offset; Right : Address) return Address;

   pragma Convention (Intrinsic, "+");

   pragma Inline_Always ("+");

   pragma Pure_Function ("+");

   function "-" (Left : Address; Right : Storage_Offset) return Address;

   pragma Convention (Intrinsic, "-");

   pragma Inline_Always ("-");

   pragma Pure_Function ("-");

   function "-" (Left, Right : Address) return Storage_Offset;

   pragma Convention (Intrinsic, "-");

   pragma Inline_Always ("-");

   pragma Pure_Function ("-");

   function "mod"

     (Left  : Address;

      Right : Storage_Offset) return  Storage_Offset;

   pragma Convention (Intrinsic, "mod");

   pragma Inline_Always ("mod");

   pragma Pure_Function ("mod");

   --  Conversion to/from integers

   type Integer_Address is mod Memory_Size;

   function To_Address (Value : Integer_Address) return Address;

   pragma Convention (Intrinsic, To_Address);

   pragma Inline_Always (To_Address);

   pragma Pure_Function (To_Address);

   function To_Integer (Value : Address) return Integer_Address;

   pragma Convention (Intrinsic, To_Integer);

   pragma Inline_Always (To_Integer);

   pragma Pure_Function (To_Integer);

end System.Storage_Elements;