From: porton@ex-code.com (Victor Porton)
Subject: Re: Fussy Standard: what is modulo Address?
Date: Thu, 23 Jan 2003 01:21:15 +0500
Date: 2003-01-22T22:08:35+00:00 [thread overview]
Message-ID: <3e2f1663$0$33931$bed64819@news.gradwell.net> (raw)
In-Reply-To: mailman.12.1043223160.4961.comp.lang.ada@ada.eu.org
In article <wccn0lt2l47.fsf@shell01.theworld.com>,
Robert A Duff <bobduff@shell01.TheWorld.com> writes:
> "Grein, Christoph" <christoph.grein@eurocopter.com> writes:
>
>> > 13.3.22-23. "For a prefix X that denotes a subtype or object:
>> > X'Alignment... Address modulo the Alignment".
>> >
>> > The Standard seems to not explain what is "Address modulo".
>> >
>> > It can be:
>> >
>> > 1. The integer mathematical operation fpr
>> > System.Storage_Element.Integer_Address.
>> >
>> > 2. Operation "mod" for System.Address, defined also in System.
>> >
>> > Moreover the Standard probably does not say anything about relations of
>> > these two operations (they should be the same as people seem to tend to
>> > naturally consider these the same).
>> >
>> > We should correct it, yes?
>>
>> You seem to have point here. Report it to ada-comment@ada-auth.org.
>
> I don't think so. "Modulo" means the "mod" operator for
> System.Address. This is defined in 13.7.1(8). The AARM states this
> explicitly in 13.3(24.b) and 13.7.1(11.b).
So, it is stated nly in AARM, not in ARM? It is a bug.
> The manual does not define the semantics of this "mod" operator. How
> could it? Address is just a private type provided by the implementer --
> it could be anything.
The manual should define relations between System.Address and
System.Storage_Element.Integer_Address. To define these seems being
just forgotten. No these relations which should be true accordingly
human intuition may have bad impact on reliability.
next prev parent reply other threads:[~2003-01-22 20:21 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-22 8:05 Fussy Standard: what is modulo Address? Grein, Christoph
2003-01-22 16:40 ` Robert A Duff
2003-01-22 20:21 ` Victor Porton [this message]
2003-01-22 23:06 ` Simon Wright
2003-01-23 0:23 ` Robert A Duff
2003-01-23 13:12 ` Wes Groleau
2003-01-23 14:10 ` Robert A Duff
2003-01-23 0:43 ` Victor Porton
2003-01-23 14:06 ` Robert A Duff
-- strict thread matches above, loose matches on Subject: below --
2003-01-23 6:53 Grein, Christoph
2003-01-22 7:33 Victor Porton
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