1------------------------------------------------------------------------------ 2-- -- 3-- GNAT COMPILER COMPONENTS -- 4-- -- 5-- S Y S T E M . S T O R A G E _ E L E M E N T S -- 6-- -- 7-- B o d y -- 8-- -- 9-- Copyright (C) 1992-2014, Free Software Foundation, Inc. -- 10-- -- 11-- GNAT is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 3, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. -- 17-- -- 18-- As a special exception under Section 7 of GPL version 3, you are granted -- 19-- additional permissions described in the GCC Runtime Library Exception, -- 20-- version 3.1, as published by the Free Software Foundation. -- 21-- -- 22-- You should have received a copy of the GNU General Public License and -- 23-- a copy of the GCC Runtime Library Exception along with this program; -- 24-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- 25-- <http://www.gnu.org/licenses/>. -- 26-- -- 27-- GNAT was originally developed by the GNAT team at New York University. -- 28-- Extensive contributions were provided by Ada Core Technologies Inc. -- 29-- -- 30------------------------------------------------------------------------------ 31 32with Ada.Unchecked_Conversion; 33 34package body System.Storage_Elements is 35 36 pragma Suppress (All_Checks); 37 38 -- Conversion to/from address 39 40 -- Note qualification below of To_Address to avoid ambiguities systems 41 -- where Address is a visible integer type. 42 43 function To_Address is 44 new Ada.Unchecked_Conversion (Storage_Offset, Address); 45 function To_Offset is 46 new Ada.Unchecked_Conversion (Address, Storage_Offset); 47 48 -- Conversion to/from integers 49 50 -- These functions must be place first because they are inlined_always 51 -- and are used and inlined in other subprograms defined in this unit. 52 53 ---------------- 54 -- To_Address -- 55 ---------------- 56 57 function To_Address (Value : Integer_Address) return Address is 58 begin 59 return Address (Value); 60 end To_Address; 61 62 ---------------- 63 -- To_Integer -- 64 ---------------- 65 66 function To_Integer (Value : Address) return Integer_Address is 67 begin 68 return Integer_Address (Value); 69 end To_Integer; 70 71 -- Address arithmetic 72 73 --------- 74 -- "+" -- 75 --------- 76 77 function "+" (Left : Address; Right : Storage_Offset) return Address is 78 begin 79 return Storage_Elements.To_Address 80 (To_Integer (Left) + To_Integer (To_Address (Right))); 81 end "+"; 82 83 function "+" (Left : Storage_Offset; Right : Address) return Address is 84 begin 85 return Storage_Elements.To_Address 86 (To_Integer (To_Address (Left)) + To_Integer (Right)); 87 end "+"; 88 89 --------- 90 -- "-" -- 91 --------- 92 93 function "-" (Left : Address; Right : Storage_Offset) return Address is 94 begin 95 return Storage_Elements.To_Address 96 (To_Integer (Left) - To_Integer (To_Address (Right))); 97 end "-"; 98 99 function "-" (Left, Right : Address) return Storage_Offset is 100 begin 101 return To_Offset (Storage_Elements.To_Address 102 (To_Integer (Left) - To_Integer (Right))); 103 end "-"; 104 105 ----------- 106 -- "mod" -- 107 ----------- 108 109 function "mod" 110 (Left : Address; 111 Right : Storage_Offset) return Storage_Offset 112 is 113 begin 114 if Right > 0 then 115 return Storage_Offset 116 (To_Integer (Left) mod Integer_Address (Right)); 117 118 -- The negative case makes no sense since it is a case of a mod where 119 -- the left argument is unsigned and the right argument is signed. In 120 -- accordance with the (spirit of the) permission of RM 13.7.1(16), 121 -- we raise CE, and also include the zero case here. Yes, the RM says 122 -- PE, but this really is so obviously more like a constraint error. 123 124 else 125 raise Constraint_Error; 126 end if; 127 end "mod"; 128 129end System.Storage_Elements; 130