From: Georg Bauhaus <sb463ba@l1-hrz.uni-duisburg.de>
Subject: Re: Improving Ada's image - Was: 7E7 Flight Controls Electronics
Date: Fri, 18 Jun 2004 14:44:13 +0000 (UTC)
Date: 2004-06-18T14:44:13+00:00 [thread overview]
Message-ID: <cauv3t$ook$1@a1-hrz.uni-duisburg.de> (raw)
In-Reply-To: sa4isdpo33m.fsf@snoopy.apana.org.au
Brian May <bam@snoopy.apana.org.au> wrote:
:>>>>> "Georg" == Georg Bauhaus <sb463ba@l1-hrz.uni-duisburg.de> writes:
:
: Georg> (And add a note that new String'("bla") need not mean dynamic heap
: Georg> allocation, for example at library level.)
:
: Any chance you could please expand on this statement? How else could
: it be implemented? What does GNAT do?
An assembly listing for the following program shows no occurence
of an allocator for Lib.fixed, and one occurence for dyn in main.
Here is the library part.
package Lib is
type String_Access is access constant String;
fixed: constant String_Access := new String'("AZAZAZ");
end Lib;
; ************* Initialized part of the global segment :
000000 lib.fixed DD __lcl.00000015
000004 __lcl.00000015 DD 00000001
DD 00000006
DB 41
DB 5A
DB 41
DB 5A
DB 41
DB 5A
; ********* End of segment, Total size = 18
To me, this looks like the String "AZAZAZ", with bounds 1 and 6.
The listing has been produced by ObjectAda 722, GNAT appears to behave
similarly.
with Lib;
procedure main is
dyn: Lib.String_Access;
n: Positive := 4;
-- to prevent the compiler from "knowing" that lib.fixed(2..4) can be
-- determined in advance, see the following statement.
begin
dyn := new String'(Lib.fixed(2..n));
end main;
For this, I get MOVements for dyn, and n, then a small calculation,
then a CALL rts_allocate.
Then some instructions referring to __lcl.00000015 from above the
lib.fixed character bytes, then a CALL _rts_block_move.
So my guess is that the allocation happens for dyn, but not for fixed.
(I don't read ASM fluently though, and neither Power PC assembler, so
take this with a grain of salt.)
IIRC, this has been discussed before.
-- Georg
next prev parent reply other threads:[~2004-06-18 14:44 UTC|newest]
Thread overview: 216+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-30 11:46 Improving Ada's image - Was: 7E7 Flight Controls Electronics Per Dalgas Jakobsen
2004-05-30 16:13 ` Pascal Obry
2004-05-30 18:03 ` Luke A. Guest
2004-05-30 19:09 ` Per Dalgas Jakobsen
2004-05-31 2:28 ` Richard Riehle
2004-05-31 15:33 ` Wes Groleau
2004-06-01 2:56 ` Hyman Rosen
2004-06-01 14:51 ` Wes Groleau
2004-06-07 16:29 ` Warren W. Gay VE3WWG
2004-06-07 17:44 ` Hyman Rosen
2004-06-08 16:09 ` Warren W. Gay VE3WWG
2004-06-08 17:30 ` Hyman Rosen
2004-06-08 20:38 ` Warren W. Gay VE3WWG
2004-06-08 22:23 ` Hyman Rosen
2004-06-09 2:27 ` Warren W. Gay VE3WWG
2004-06-09 4:41 ` I R T
2004-06-09 6:43 ` Richard Riehle
2004-06-10 6:53 ` Randy Brukardt
2004-06-12 3:16 ` Robert I. Eachus
2004-06-09 6:39 ` Hyman Rosen
2004-06-09 7:44 ` I R T
2004-06-09 12:13 ` Georg Bauhaus
2004-06-09 12:34 ` Warren W. Gay VE3WWG
2004-06-09 21:13 ` Hyman Rosen
2004-06-10 2:51 ` Wes Groleau
2004-06-10 15:57 ` Hyman Rosen
2004-06-10 17:18 ` Pascal Obry
2004-06-10 12:13 ` Marin David Condic
2004-06-11 12:48 ` Warren W. Gay VE3WWG
2004-06-11 17:31 ` Marin David Condic
2004-06-14 2:30 ` Berend de Boer
2004-06-14 2:47 ` I R T
2004-06-14 3:10 ` Hyman Rosen
2004-06-14 11:49 ` Marin David Condic
2004-06-14 16:28 ` Warren W. Gay VE3WWG
2004-06-14 17:34 ` Hyman Rosen
2004-06-15 11:35 ` Marin David Condic
2004-06-15 23:02 ` Brian May
2004-06-16 11:37 ` Marin David Condic
2004-06-21 14:56 ` Jacob Sparre Andersen
2004-06-23 20:19 ` Randy Brukardt
2004-06-15 16:30 ` Warren W. Gay VE3WWG
2004-06-15 11:26 ` Marin David Condic
2004-06-15 16:43 ` Warren W. Gay VE3WWG
2004-06-15 18:51 ` Hyman Rosen
2004-06-15 21:02 ` Warren W. Gay VE3WWG
2004-06-15 22:01 ` Hyman Rosen
2004-06-15 22:08 ` Ed Falis
2004-06-15 22:26 ` Hyman Rosen
2004-06-17 15:50 ` Robert I. Eachus
2004-06-17 16:12 ` Hyman Rosen
2004-06-17 21:05 ` Pascal Obry
2004-06-17 21:47 ` Hyman Rosen
2004-06-17 22:18 ` Georg Bauhaus
2004-06-18 5:19 ` Brian May
2004-06-18 14:44 ` Georg Bauhaus [this message]
2004-06-17 23:02 ` Brian May
2004-06-18 7:50 ` Martin Dowie
2004-06-19 20:40 ` Robert I. Eachus
2004-06-19 18:10 ` Ragged arrays of strings (Was: Improving Ada's image) Jacob Sparre Andersen
2004-06-20 22:01 ` Pascal Obry
2004-06-19 20:54 ` Improving Ada's image - Was: 7E7 Flight Controls Electronics Robert I. Eachus
2004-06-20 2:20 ` Jeffrey Carter
2004-06-20 4:24 ` tmoran
2004-06-20 15:06 ` Dr. Adrian Wrigley
2004-06-21 15:30 ` Enum'Image (Was: Improving Ada's image) Jacob Sparre Andersen
2004-06-21 16:06 ` Dr. Adrian Wrigley
2004-06-21 16:53 ` Alexander E. Kopilovich
2004-06-22 21:38 ` Jacob Sparre Andersen
2004-06-23 15:42 ` Alexander E. Kopilovich
2004-06-23 17:15 ` Larry Kilgallen
2004-06-22 13:26 ` Dmitry A. Kazakov
2004-06-23 16:04 ` Frank J. Lhota
2004-06-25 0:07 ` Enum'Image Jacob Sparre Andersen
2004-06-25 15:55 ` Enum'Image Frank J. Lhota
2004-06-23 20:29 ` Enum'Image (Was: Improving Ada's image) Randy Brukardt
2004-06-23 23:35 ` Dr. Adrian Wrigley
2004-06-25 0:15 ` Jacob Sparre Andersen
2004-06-26 5:11 ` Improving Ada's image - Was: 7E7 Flight Controls Electronics Robert I. Eachus
2004-06-27 1:00 ` Jeffrey Carter
2004-06-27 2:33 ` Robert I. Eachus
2004-06-15 23:30 ` Dale Stanbrough
2004-06-15 21:59 ` Marin David Condic
2004-06-25 4:21 ` Enum'Image (Was: Improving Ada's image) Larry Kilgallen
2004-06-15 19:28 ` Improving Ada's image - Was: 7E7 Flight Controls Electronics Alexander E. Kopilovich
2004-06-15 21:04 ` Warren W. Gay VE3WWG
2004-06-15 22:13 ` Marin David Condic
2004-06-16 0:05 ` Alexander E. Kopilovich
2004-06-15 22:08 ` Marin David Condic
2004-06-15 23:06 ` tmoran
2004-06-16 11:47 ` Marin David Condic
2004-06-17 1:33 ` Brian May
2004-06-17 12:09 ` Marin David Condic
2004-06-16 0:56 ` Alexander E. Kopilovich
2004-06-16 11:54 ` Marin David Condic
2004-06-15 1:21 ` Alexander E. Kopilovich
2004-07-01 4:08 ` Dave Thompson
2004-07-04 19:00 ` Robert I. Eachus
2004-06-14 11:45 ` Marin David Condic
2004-06-14 13:20 ` Larry Kilgallen
2004-06-15 11:39 ` Marin David Condic
2004-06-19 23:14 ` Pylinius
2004-06-15 11:41 ` David Starner
2004-06-15 16:29 ` Richard Riehle
2004-06-15 17:06 ` Warren W. Gay VE3WWG
2004-06-11 17:53 ` Hyman Rosen
2004-06-11 18:56 ` Marin David Condic
2004-06-11 23:23 ` Hyman Rosen
2004-06-12 3:08 ` Ada BIND was: " Robert I. Eachus
2004-06-12 12:03 ` Marin David Condic
2004-06-12 12:47 ` Jeff C,
2004-06-13 12:22 ` Marin David Condic
2004-06-14 16:33 ` Warren W. Gay VE3WWG
2004-06-13 6:08 ` Russ
2004-06-13 10:28 ` Georg Bauhaus
2004-06-13 14:49 ` Stephen Leake
2004-06-13 20:51 ` Russ
2004-06-13 23:15 ` Robert I. Eachus
2004-06-14 2:09 ` Hyman Rosen
2004-06-15 0:02 ` Alexander E. Kopilovich
2004-06-15 2:40 ` Brian May
2004-06-15 12:46 ` Frank J. Lhota
2004-06-15 18:53 ` Jeffrey Carter
2004-06-15 22:09 ` Hyman Rosen
2004-07-01 4:08 ` Dave Thompson
2004-06-14 16:43 ` Warren W. Gay VE3WWG
2004-06-15 11:47 ` Marin David Condic
2004-06-15 16:21 ` Warren W. Gay VE3WWG
2004-06-15 19:36 ` Frank J. Lhota
2004-06-15 19:51 ` Björn Persson
2004-06-16 13:44 ` Frank J. Lhota
2004-06-15 22:13 ` Hyman Rosen
2004-06-15 22:32 ` Björn Persson
2004-06-15 23:04 ` Hyman Rosen
2004-06-15 23:23 ` Brian May
2004-06-15 23:26 ` tmoran
2004-06-16 18:11 ` Ludovic Brenta
2004-06-15 23:33 ` Björn Persson
2004-06-15 23:18 ` Dale Stanbrough
2004-06-15 23:22 ` Hyman Rosen
2004-06-15 23:37 ` Dale Stanbrough
2004-06-15 23:59 ` Björn Persson
2004-06-16 13:38 ` Ada BIND was: Improving Ada's image - Was: 7E7 Flight Controls Larry Kilgallen
2004-06-09 10:52 ` Ada operating systems Peter C. Chapin
2004-06-09 12:07 ` Improving Ada's image - Was: 7E7 Flight Controls Electronics Georg Bauhaus
2004-06-11 7:05 ` Hyman Rosen
2004-06-11 15:07 ` Georg Bauhaus
2004-06-09 12:32 ` Marin David Condic
2004-06-15 20:34 ` Larry Kilgallen
2004-06-08 19:51 ` Wes Groleau
2004-06-08 22:26 ` Hyman Rosen
2004-06-09 4:39 ` I R T
2004-06-09 8:13 ` Dmitry A. Kazakov
2004-06-09 12:42 ` Warren W. Gay VE3WWG
2004-06-09 12:38 ` Warren W. Gay VE3WWG
2004-06-09 16:23 ` Robert I. Eachus
2004-06-09 16:38 ` Marius Amado Alves
2004-06-09 20:51 ` Robert I. Eachus
2004-06-10 12:43 ` Marin David Condic
2004-06-15 19:55 ` Larry Kilgallen
2004-06-09 23:45 ` Richard Riehle
2004-06-10 12:58 ` Marin David Condic
2004-06-11 18:03 ` Russ
2004-06-14 16:16 ` Warren W. Gay VE3WWG
2004-06-01 2:45 ` Hyman Rosen
2004-06-04 17:24 ` Improving Ada's image - Was: 7E7 Flight Controls Electronics (why not Universities?) Warren W. Gay VE3WWG
2004-06-04 18:46 ` Marius Amado Alves
2004-06-07 12:58 ` Warren W. Gay VE3WWG
2004-06-07 17:11 ` Ada in colleges and universities Peter C. Chapin
2004-06-07 17:29 ` Marius Amado Alves
2004-06-07 19:47 ` Peter C. Chapin
2004-06-07 18:39 ` Björn Persson
2004-06-07 18:55 ` Marius Amado Alves
2004-06-07 19:21 ` Jerome Hugues
2004-06-07 19:27 ` (see below)
2004-06-07 19:44 ` Marius Amado Alves
2004-06-08 1:14 ` Alexander E. Kopilovich
2004-06-07 22:06 ` Björn Persson
2004-06-07 22:17 ` (see below)
2004-06-08 9:30 ` Adrian Knoth
2004-06-08 17:12 ` Jeffrey Carter
2004-06-08 18:19 ` Adrian Knoth
2004-06-08 9:53 ` Jano
2004-06-09 8:55 ` Pascal Obry
2004-06-07 19:53 ` Peter C. Chapin
2004-06-07 21:54 ` Björn Persson
2004-06-09 3:52 ` I R T
2004-06-09 12:51 ` Björn Persson
2004-06-10 2:58 ` Wes Groleau
2004-06-07 22:03 ` Ludovic Brenta
2004-06-08 0:16 ` Jeffrey Carter
2004-06-08 5:12 ` Ludovic Brenta
2004-06-08 16:14 ` Warren W. Gay VE3WWG
2004-06-06 13:34 ` Improving Ada's image - Was: 7E7 Flight Controls Electronics (why not Universities?) Ralph W. Reid
2004-06-07 2:38 ` Robert I. Eachus
2004-05-30 18:47 ` Improving Ada's image - Was: 7E7 Flight Controls Electronics Richard Riehle
2004-05-31 12:57 ` Marin David Condic
2004-05-31 23:36 ` Berend de Boer
2004-06-01 0:41 ` tmoran
2004-06-01 11:04 ` Marin David Condic
2004-06-01 14:44 ` Wes Groleau
2004-06-01 18:43 ` Pascal Obry
2004-06-07 16:35 ` Warren W. Gay VE3WWG
2004-05-31 12:45 ` Marin David Condic
2004-05-31 20:55 ` Improving Ada's image Björn Persson
2004-06-01 0:41 ` Alexander E. Kopilovich
2004-06-01 11:23 ` Marin David Condic
2004-06-01 2:40 ` Improving Ada's image - Was: 7E7 Flight Controls Electronics Hyman Rosen
2004-06-01 21:14 ` Per Dalgas Jakobsen
2004-06-02 1:12 ` Ed Falis
2004-06-02 10:59 ` Stefan Nobis
2004-06-03 4:19 ` Jeffrey Carter
-- strict thread matches above, loose matches on Subject: below --
2004-05-31 9:22 Rod Chapman
2004-06-01 11:30 ` Georg Bauhaus
2004-06-18 14:43 abrandon
2004-06-18 17:49 ` Wes Groleau
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