------------------------------------------------------------------------------ -- -- -- 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 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, 59 Temple Place - Suite 330, Boston, -- -- MA 02111-1307, 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 (Address_Operations); -- 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;