From: Andrew Haley <aph@redhat.com>
To: Per Bothner <per@bothner.com>
Cc: Florian Weimer <fw@deneb.enyo.de>, Robert Dewar <dewar@gnat.com>,
Richard Kenner <kenner@vlsi1.ultra.nyu.edu>,
gcc@gcc.gnu.org
Subject: Re: Reenabling Ada by default
Date: Sun, 12 Sep 2004 12:29:00 -0000 [thread overview]
Message-ID: <16708.11091.421212.385401@cuddles.cambridge.redhat.com> (raw)
In-Reply-To: <4143A6F8.2020202@bothner.com>
Per Bothner writes:
> Florian Weimer wrote:
>
> > By the way, have you already decided on the implementation model for
> > interfaces? Do you plan to mirror the C++ ABI (which requires one
> > word in every object for each interface it implements), a "fat
> > pointers" model (where access-to-interface types include a pointer to
> > an interface descriptor and the object), or a hybrid (something based
> > on hashing, for example)?
>
> You might also look at the GCJ way of implementing Java interfaces.
> An object reference is a plain pointer, and there are not extra
> per-object "vobject" fields as in C++. Instead we use a kind of
> double dispatch using initialization-time-computed indexin, which
> yields constant-time dispatch.
>
> The GCJ ABI is changing to support binary compatibility; I don't know
> how this changes the interface implementation.
Not at all: we've managed to work out how to preserve binary
compatibility while maintaining constant-time interface dispatch. I
checked in the implementation yesterday.
Andrew.
next prev parent reply other threads:[~2004-09-12 10:56 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-09 20:37 Richard Kenner
2004-09-09 20:56 ` Robert Dewar
2004-09-09 20:57 ` Florian Weimer
2004-09-09 21:04 ` Robert Dewar
2004-09-12 2:46 ` Per Bothner
2004-09-12 12:29 ` Andrew Haley [this message]
2004-09-12 14:15 ` Florian Weimer
2004-09-12 14:41 ` Robert Dewar
2004-09-12 17:48 ` Tom Tromey
2004-09-12 23:39 ` Per Bothner
2004-09-09 21:19 ` Eric Christopher
2004-09-09 21:45 ` Robert Dewar
2004-09-09 22:25 ` Gabriel Dos Reis
2004-09-10 0:29 ` Giovanni Bajo
2004-09-09 21:26 ` Duncan Sands
2004-09-09 21:57 ` Robert Dewar
2004-09-10 3:50 ` Kaveh R. Ghazi
2004-09-09 22:50 ` James A. Morrison
2004-09-09 22:54 ` Joseph S. Myers
2004-09-09 23:08 ` Robert Dewar
2004-09-09 23:29 ` Daniel Jacobowitz
2004-09-10 16:17 ` James A. Morrison
2004-09-09 23:07 ` Richard Henderson
2004-09-09 23:23 ` Kaveh R. Ghazi
-- strict thread matches above, loose matches on Subject: below --
2004-09-10 17:55 Richard Kenner
2004-09-10 22:07 ` Phil Edwards
2004-09-10 11:58 Richard Kenner
2004-09-10 14:11 ` Gabriel Dos Reis
2004-09-10 5:39 Richard Kenner
2004-09-10 6:14 ` Phil Edwards
2004-09-10 4:38 Richard Kenner
2004-09-10 4:55 ` Kaveh R. Ghazi
2004-09-10 3:12 Richard Kenner
2004-09-10 2:18 Richard Kenner
2004-09-10 5:19 ` Phil Edwards
2004-09-10 1:52 Richard Kenner
2004-09-10 2:18 ` Paul Brook
2004-09-10 5:08 ` Richard Henderson
2004-09-09 22:17 Richard Kenner
2004-09-09 22:12 Wolfgang Bangerth
2004-09-09 21:36 Richard Kenner
2004-09-09 22:06 ` Duncan Sands
2004-09-09 19:01 Richard Kenner
2004-09-09 19:17 ` Zack Weinberg
2004-09-09 19:22 ` Robert Dewar
2004-09-09 19:40 ` Zack Weinberg
2004-09-09 19:41 ` Robert Dewar
2004-09-09 19:56 ` Diego Novillo
2004-09-09 20:04 ` Andrew Haley
2004-09-09 22:10 ` Gabriel Dos Reis
2004-09-09 19:40 ` Kaveh R. Ghazi
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