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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) 2002-2007, 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 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. --
-- --
------------------------------------------------------------------------------
-- 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!
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 Warnings (Off);
pragma Universal_Aliasing (Storage_Element);
pragma Warnings (On);
-- This type is used by the expansion to implement aggregate copy.
-- We turn off warnings for this pragma to deal with being compiled
-- with an earlier GNAT version that does not recognize this pragma.
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);
-- The following is a dummy record designed to mimic Communication_Block as
-- defined in s-tpobop.ads:
-- type Communication_Block is record
-- Self : Task_Id; -- An access type
-- Enqueued : Boolean := True;
-- Cancelled : Boolean := False;
-- end record;
-- The record is used in the construction of the predefined dispatching
-- primitive _disp_asynchronous_select in order to avoid the import of
-- System.Tasking.Protected_Objects.Operations. Note that this package
-- is always imported in the presence of interfaces since the dispatch
-- table uses entities from here.
type Dummy_Communication_Block is record
Comp_1 : Address; -- Address and access have the same size
Comp_2 : Boolean;
Comp_3 : Boolean;
end record;
end System.Storage_Elements;
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