| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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; |
