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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 Warnings (Off);
-pragma Compiler_Unit;
-pragma Warnings (On);
-
-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);
-
-end System.Storage_Elements;