------------------------------------------------------------------------------ -- -- -- 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) 1992-2014, 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 Compiler_Unit_Warning; with Ada.Unchecked_Conversion; package body System.Storage_Elements is pragma Suppress (All_Checks); -- Conversion to/from address -- Note qualification below of To_Address to avoid ambiguities systems -- where Address is a visible integer type. 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. ---------------- -- To_Address -- ---------------- function To_Address (Value : Integer_Address) return Address is begin return Address (Value); end To_Address; ---------------- -- To_Integer -- ---------------- function To_Integer (Value : Address) return Integer_Address is begin return Integer_Address (Value); end To_Integer; -- Address arithmetic --------- -- "+" -- --------- function "+" (Left : Address; Right : Storage_Offset) return Address is begin return Storage_Elements.To_Address (To_Integer (Left) + To_Integer (To_Address (Right))); end "+"; function "+" (Left : Storage_Offset; Right : Address) return Address is begin return Storage_Elements.To_Address (To_Integer (To_Address (Left)) + To_Integer (Right)); end "+"; --------- -- "-" -- --------- function "-" (Left : Address; Right : Storage_Offset) return Address is begin return Storage_Elements.To_Address (To_Integer (Left) - To_Integer (To_Address (Right))); end "-"; function "-" (Left, Right : Address) return Storage_Offset is begin return To_Offset (Storage_Elements.To_Address (To_Integer (Left) - To_Integer (Right))); end "-"; ----------- -- "mod" -- ----------- 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;