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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;
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