------------------------------------------------------------------------------ -- -- -- 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) 2002-2004 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, 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. -- -- 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 (Storage_Elements); -- Note that we take advantage of the implementation permission to make -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). -- 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); 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; 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;