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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 --
--- --
--- B o d y --
--- --
--- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
--- --
--- 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. --
--- --
-------------------------------------------------------------------------------
-
-pragma Warnings (Off);
-pragma Compiler_Unit;
-pragma Warnings (On);
-
-with Ada.Unchecked_Conversion;
-
-package body System.Storage_Elements is
-
- pragma Suppress (All_Checks);
-
- function To_Address is
- new Ada.Unchecked_Conversion (Storage_Offset, Address);
- function To_Offset is
- new Ada.Unchecked_Conversion (Address, Storage_Offset);
-
- -- Conversion to/from integers
-
- -- These functions must be place first because they are inlined_always
- -- and are used and inlined in other subprograms defined in this unit.
-
- function To_Integer (Value : Address) return Integer_Address is
- begin
- return Integer_Address (Value);
- end To_Integer;
-
- function To_Address (Value : Integer_Address) return Address is
- begin
- return Address (Value);
- end To_Address;
-
- -- Address arithmetic
-
- function "+" (Left : Address; Right : Storage_Offset) return Address is
- begin
- return To_Address (To_Integer (Left) + To_Integer (To_Address (Right)));
- end "+";
-
- function "+" (Left : Storage_Offset; Right : Address) return Address is
- begin
- return To_Address (To_Integer (To_Address (Left)) + To_Integer (Right));
- end "+";
-
- function "-" (Left : Address; Right : Storage_Offset) return Address is
- begin
- return To_Address (To_Integer (Left) - To_Integer (To_Address (Right)));
- end "-";
-
- function "-" (Left, Right : Address) return Storage_Offset is
- begin
- return To_Offset (To_Address (To_Integer (Left) - To_Integer (Right)));
- end "-";
-
- function "mod"
- (Left : Address;
- Right : Storage_Offset) return Storage_Offset
- is
- begin
- if Right > 0 then
- return Storage_Offset
- (To_Integer (Left) mod Integer_Address (Right));
-
- -- The negative case makes no sense since it is a case of a mod where
- -- the left argument is unsigned and the right argument is signed. In
- -- accordance with the (spirit of the) permission of RM 13.7.1(16),
- -- we raise CE, and also include the zero case here. Yes, the RM says
- -- PE, but this really is so obviously more like a constraint error.
-
- else
- raise Constraint_Error;
- end if;
- end "mod";
-end System.Storage_Elements;