From: eachus@spectre.mitre.org (Robert I. Eachus)
Subject: Re: Garbage Collection in Ada
Date: 1996/10/17
Date: 1996-10-17T00:00:00+00:00 [thread overview]
Message-ID: <EACHUS.96Oct16204717@spectre.mitre.org> (raw)
In-Reply-To: 01bbb910$f1e73f60$829d6482@joy.ericsson.se
In article <dewar.845470908@merv> dewar@merv.cs.nyu.edu (Robert Dewar) writes:
> Well I would not call it ignorance, since this is certainly not a
> recognized technical term. In fact I can't even remember if GNAT
> invented it or not, I suspect we did.
You may have, but every PL/I compiler implementor I know has come
up with the same term or a similar one. In PL/I you have to support
pointers to subprograms, which have to designate the code, the
environment/stack and the location of associated static local data.
Some compilers use three word pointers, at Stratus we used two by
having a static pointer and code pointer pair for each subprogram in
global memory, so a fat pointer designated the stack frame and this
vector.
> We use it simply to mean, as you say, a pointer with other
> information. For example, in GNAT, the default (but overridable)
> form of pointers to unconstrained arrays is a structure with two
> pointers, one to the data (which could be, but is not yet, a
> virtual origin), and one a pointer to a record containing the
> array bounds.
Just out of curiousity, how do you implement access to subprogram
types in GNAT? Do you use a pair of addresses or stick the code
pointer in the stack frame? Or does this vary from target to target?
--
Robert I. Eachus
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next prev parent reply other threads:[~1996-10-17 0:00 UTC|newest]
Thread overview: 126+ messages / expand[flat|nested] mbox.gz Atom feed top
1996-10-13 0:00 Garbage Collection in Ada Jonas Nygren
1996-10-13 0:00 ` Robert Dewar
1996-10-13 0:00 ` Lars Farm
1996-10-13 0:00 ` Robert Dewar
[not found] ` <19961014115513529729@dialup105-2-16.swipnet.se>
1996-10-16 0:00 ` Robert Dewar
1996-10-16 0:00 ` Lars Farm
1996-10-16 0:00 ` Robert Dewar
1996-10-16 0:00 ` Hans-Juergen Boehm
1996-10-17 0:00 ` Robert Dewar
1996-10-17 0:00 ` Hans-Juergen Boehm
1996-10-17 0:00 ` Robert A Duff
1996-10-17 0:00 ` Hans-Juergen Boehm
1996-10-17 0:00 ` Larry Kilgallen
1996-10-17 0:00 ` Lars Farm
1996-10-23 0:00 ` Robert Dewar
1996-10-16 0:00 ` Hans-Juergen Boehm
1996-10-16 0:00 ` Robert Dewar
1996-10-16 0:00 ` Hans-Juergen Boehm
1996-10-17 0:00 ` Robert Dewar
1996-10-17 0:00 ` Hans-Juergen Boehm
1996-10-17 0:00 ` Robert Dewar
1996-10-13 0:00 ` Larry Kilgallen
1996-10-14 0:00 ` John Howard
1996-10-15 0:00 ` Lars Farm
1996-10-15 0:00 ` Robert Dewar
1996-10-15 0:00 ` Lars Farm
1996-10-15 0:00 ` Hans-Juergen Boehm
1996-10-17 0:00 ` Thomas Kendelbacher
1996-10-17 0:00 ` Robert Dewar
1996-10-23 0:00 ` Richard A. O'Keefe
1996-10-23 0:00 ` Larry Kilgallen
1996-10-15 0:00 ` Robert A Duff
1996-10-14 0:00 ` Robert A Duff
1996-10-14 0:00 ` Lars Farm
1996-10-15 0:00 ` Robert A Duff
1996-10-16 0:00 ` Lars Farm
1996-10-16 0:00 ` Robert Dewar
1996-10-17 0:00 ` Robert A Duff
1996-10-19 0:00 ` Richard Kenner
1996-10-19 0:00 ` Robert Dewar
1996-10-19 0:00 ` Lars Farm
1996-10-20 0:00 ` Robert Dewar
1996-10-20 0:00 ` Robert A Duff
1996-10-20 0:00 ` Robert Dewar
1996-10-21 0:00 ` Lars Farm
1996-10-21 0:00 ` Robert Dewar
1996-10-21 0:00 ` Lars Farm
1996-10-21 0:00 ` Geert Bosch
1996-10-21 0:00 ` Hans-Juergen Boehm
1996-10-23 0:00 ` Fergus Henderson
1996-10-24 0:00 ` Richard A. O'Keefe
1996-10-20 0:00 ` Robert A Duff
1996-10-20 0:00 ` Robert Dewar
1996-10-21 0:00 ` Hans-Juergen Boehm
1996-10-21 0:00 ` Robert Dewar
1996-10-15 0:00 ` Hans-Juergen Boehm
1996-10-15 0:00 ` Keith Thompson
1996-10-14 0:00 ` Jon S Anthony
1996-10-15 0:00 ` Robert Dewar
1996-10-15 0:00 ` Robert I. Eachus
1996-10-15 0:00 ` Robert Dewar
1996-10-16 0:00 ` whiting_ms@corning.com (Matt Whiting)
1996-10-16 0:00 ` Robert Dewar
1996-10-17 0:00 ` John Howard
1996-10-17 0:00 ` Robert Dewar
1996-10-18 0:00 ` Lars Farm
1996-10-19 0:00 ` Robert Dewar
1996-10-20 0:00 ` Lars Farm
1996-10-21 0:00 ` Nicolay Belofastow
1996-10-21 0:00 ` Robert Dewar
1996-10-21 0:00 ` Robert Dewar
1996-10-22 0:00 ` Lars Farm
1996-10-20 0:00 ` Robert A Duff
1996-10-20 0:00 ` Robert Dewar
1996-10-22 0:00 ` Mitch Gart
1996-10-23 0:00 ` Fergus Henderson
1996-10-23 0:00 ` Hans-Juergen Boehm
1996-10-27 0:00 ` Richard Riehle
1996-10-29 0:00 ` Jon S Anthony
1996-10-30 0:00 ` Jon S Anthony
1996-10-30 0:00 ` James Rogers
1996-10-30 0:00 ` Jonas Nygren
1996-10-30 0:00 ` Brian Rogoff
1996-10-18 0:00 ` Lars Farm
1996-10-20 0:00 ` Robert A Duff
1996-10-18 0:00 ` Hans-Juergen Boehm
1996-10-15 0:00 ` Hannes Haug
1996-10-16 0:00 ` Ole-Hjalmar Kristensen FOU.TD/DELAB
1996-10-16 0:00 ` Robert Dewar
1996-10-16 0:00 ` Jon S Anthony
1996-10-16 0:00 ` Jon S Anthony
1996-10-17 0:00 ` Robert Dewar
1996-10-16 0:00 ` Jon S Anthony
1996-10-16 0:00 ` Jon S Anthony
1996-10-17 0:00 ` Robert I. Eachus [this message]
1996-10-17 0:00 ` Robert Dewar
1996-10-17 0:00 ` Richard Kenner
1996-10-17 0:00 ` Rick Hudson
1996-10-17 0:00 ` Hans-Juergen Boehm
1996-10-18 0:00 ` Jon S Anthony
1996-10-23 0:00 ` Robert Dewar
1996-10-18 0:00 ` Jon S Anthony
1996-10-18 0:00 ` Robert Dewar
1996-10-18 0:00 ` Rick Hudson
1996-10-21 0:00 ` Jon S Anthony
1996-10-21 0:00 ` Laurent Pautet
1996-10-22 0:00 ` Jon S Anthony
1996-10-22 0:00 ` Tapani Rundgren
1996-10-23 0:00 ` Jon S Anthony
1996-10-24 0:00 ` Mitch Gart
1996-10-24 0:00 ` Robert I. Eachus
1996-10-24 0:00 ` Hans-Juergen Boehm
1996-10-25 0:00 ` Jon S Anthony
1996-10-28 0:00 ` Robert I. Eachus
1996-10-29 0:00 ` Hans-Juergen Boehm
-- strict thread matches above, loose matches on Subject: below --
1996-11-02 0:00 Jon S Anthony
[not found] <01bbc6a3$4cf03480$829d6482@joy.ericsson.se>
1996-10-31 0:00 ` Mitch Gart
1996-10-31 0:00 ` Jonas Nygren
1996-11-03 0:00 ` Matthew Heaney
1996-11-06 0:00 ` Robert A Duff
1996-11-06 0:00 ` Norman H. Cohen
1996-11-01 0:00 ` Jon S Anthony
1996-11-06 0:00 ` Brian Rogoff
1996-11-07 0:00 ` Tucker Taft
1996-10-22 0:00 Brian Rogoff
1996-10-11 0:00 C++ Standardization (was: Once again, Ada absent from DoD SBIR solicitation) Dave Wood
1996-10-17 0:00 ` Garbage Collection in Ada Thomas Kendelbacher
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