132 lines
5 KiB
Ada
132 lines
5 KiB
Ada
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------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- S Y S T E M . S T O R A G E _ E L E M E N T S --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2014, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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pragma Compiler_Unit_Warning;
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with Ada.Unchecked_Conversion;
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package body System.Storage_Elements is
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pragma Suppress (All_Checks);
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-- Conversion to/from address
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-- Note qualification below of To_Address to avoid ambiguities systems
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-- where Address is a visible integer type.
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function To_Address is
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new Ada.Unchecked_Conversion (Storage_Offset, Address);
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function To_Offset is
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new Ada.Unchecked_Conversion (Address, Storage_Offset);
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-- Conversion to/from integers
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-- These functions must be place first because they are inlined_always
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-- and are used and inlined in other subprograms defined in this unit.
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----------------
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-- To_Address --
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----------------
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function To_Address (Value : Integer_Address) return Address is
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begin
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return Address (Value);
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end To_Address;
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----------------
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-- To_Integer --
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----------------
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function To_Integer (Value : Address) return Integer_Address is
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begin
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return Integer_Address (Value);
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end To_Integer;
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-- Address arithmetic
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---------
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-- "+" --
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---------
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function "+" (Left : Address; Right : Storage_Offset) return Address is
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begin
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return Storage_Elements.To_Address
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(To_Integer (Left) + To_Integer (To_Address (Right)));
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end "+";
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function "+" (Left : Storage_Offset; Right : Address) return Address is
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begin
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return Storage_Elements.To_Address
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(To_Integer (To_Address (Left)) + To_Integer (Right));
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end "+";
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---------
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-- "-" --
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---------
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function "-" (Left : Address; Right : Storage_Offset) return Address is
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begin
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return Storage_Elements.To_Address
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(To_Integer (Left) - To_Integer (To_Address (Right)));
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end "-";
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function "-" (Left, Right : Address) return Storage_Offset is
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begin
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return To_Offset (Storage_Elements.To_Address
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(To_Integer (Left) - To_Integer (Right)));
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end "-";
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-----------
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-- "mod" --
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-----------
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function "mod"
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(Left : Address;
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Right : Storage_Offset) return Storage_Offset
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is
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begin
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if Right > 0 then
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return Storage_Offset
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(To_Integer (Left) mod Integer_Address (Right));
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-- The negative case makes no sense since it is a case of a mod where
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-- the left argument is unsigned and the right argument is signed. In
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-- accordance with the (spirit of the) permission of RM 13.7.1(16),
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-- we raise CE, and also include the zero case here. Yes, the RM says
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-- PE, but this really is so obviously more like a constraint error.
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else
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raise Constraint_Error;
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end if;
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end "mod";
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end System.Storage_Elements;
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