| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S Y S T E M . A D D R E S S _ O P E R A T I O N S -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 2004-2005 Free Software Foundation, Inc. -- |
| -- -- |
| -- This specification is derived from the Ada Reference Manual for use with -- |
| -- GNAT. The copyright notice above, and the license provisions that follow -- |
| -- apply solely to the implementation dependent sections of this file. -- |
| -- -- |
| -- 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 2, 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. See the GNU General Public License -- |
| -- for more details. You should have received a copy of the GNU General -- |
| -- Public License distributed with GNAT; see file COPYING. If not, write -- |
| -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, -- |
| -- Boston, MA 02110-1301, USA. -- |
| -- -- |
| -- As a special exception, if other files instantiate generics from this -- |
| -- unit, or you link this unit with other files to produce an executable, -- |
| -- this unit does not by itself cause the resulting executable to be -- |
| -- covered by the GNU General Public License. This exception does not -- |
| -- however invalidate any other reasons why the executable file might be -- |
| -- covered by the GNU Public License. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- This package provides arithmetic and logical operations on type Address. |
| -- It is intended for use by other packages in the System hierarchy. For |
| -- applications requiring this capability, see System.Storage_Elements or |
| -- the operations introduced in System.Aux_DEC; |
| |
| -- The reason we need this package is that arithmetic operations may not |
| -- be available in the case where type Address is non-private and the |
| -- operations have been made abstract in the spec of System (to avoid |
| -- inappropriate use by applications programs). In addition, the logical |
| -- operations may not be available if type Address is a signed integer. |
| |
| package System.Address_Operations is |
| pragma Pure; |
| |
| -- The semantics of the arithmetic operations are those that apply to |
| -- a modular type with the same length as Address, i.e. they provide |
| -- twos complement wrap around arithmetic treating the address value |
| -- as an unsigned value, with no overflow checking. |
| |
| -- Note that we do not use the infix names for these operations to |
| -- avoid problems with ambiguities coming from declarations in package |
| -- Standard (which may or may not be visible depending on the exact |
| -- form of the declaration of type System.Address). |
| |
| function AddA (Left, Right : Address) return Address; |
| function SubA (Left, Right : Address) return Address; |
| function MulA (Left, Right : Address) return Address; |
| function DivA (Left, Right : Address) return Address; |
| function ModA (Left, Right : Address) return Address; |
| |
| -- The semantics of the logical operations are those that apply to |
| -- a modular type with the same length as Address, i.e. they provide |
| -- bit-wise operations on all bits of the value (including the sign |
| -- bit if Address is a signed integer type). |
| |
| function AndA (Left, Right : Address) return Address; |
| function OrA (Left, Right : Address) return Address; |
| |
| pragma Inline_Always (AddA); |
| pragma Inline_Always (SubA); |
| pragma Inline_Always (MulA); |
| pragma Inline_Always (DivA); |
| pragma Inline_Always (ModA); |
| pragma Inline_Always (AndA); |
| pragma Inline_Always (OrA); |
| |
| end System.Address_Operations; |
