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+------------------------------------------------------------------------------
+-- --
+-- 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) 2004-2009, 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. --
+-- --
+------------------------------------------------------------------------------
+
+-- 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.
+
+pragma Compiler_Unit;
+
+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).
+
+ -- For addition, subtraction, and multiplication, the effect of overflow
+ -- is 2's complement wrapping (as though the type Address were unsigned).
+
+ -- For division and modulus operations, the caller is responsible for
+ -- ensuring that the Right argument is non-zero, and the effect of the
+ -- call is not specified if a zero argument is passed.
+
+ 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;