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Diffstat (limited to 'gcc/ada/s-addope.ads')
| -rw-r--r-- | gcc/ada/s-addope.ads | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/gcc/ada/s-addope.ads b/gcc/ada/s-addope.ads new file mode 100644 index 00000000000..1fc7d3576d3 --- /dev/null +++ b/gcc/ada/s-addope.ads @@ -0,0 +1,84 @@ +------------------------------------------------------------------------------ +-- -- +-- 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; |