From: dewar@cs.nyu.edu (Robert Dewar)
Subject: Re: Access type representations.
Date: 28 Oct 1994 12:52:01 -0400
Date: 1994-10-28T12:52:01-04:00 [thread overview]
Message-ID: <38ra7h$jhc@gnat.cs.nyu.edu> (raw)
In-Reply-To: CyDxsq.JFB@inmet.camb.inmet.com
In addition to Tucker's list of non-pointer representations of access types,
consider also the GNAT representation for pointers to unconstrained types.
These are two words long, one word points to the template containing the
bounds, and the other word points to the data of the array. Eventually we
expect to change this second word so that it points to the virtual origin
of the array, instead of the actual origin, thus avoiding the need to
subtract lower bounds when indexing into the array, but we have not don
e this yet.
next prev parent reply other threads:[~1994-10-28 16:52 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
1994-10-28 11:31 Access type representations Bob Wells #402
1994-10-28 13:36 ` Tucker Taft
1994-10-28 16:52 ` Robert Dewar [this message]
1994-10-28 17:03 ` Mitch Gart
1994-10-30 16:02 ` Robert Dewar
1994-11-01 13:57 ` Keith Thompson
-- strict thread matches above, loose matches on Subject: below --
1994-11-02 7:53 Bob Wells #402
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