From: "Steve Juranich" <sjuranic@gmail.com>
Subject: Bug in make-shared-array.
Date: Mon, 27 Feb 2006 16:12:07 -0700 [thread overview]
Message-ID: <56190b6c0602271512x5b43963fh174f5335906b6dcf@mail.gmail.com> (raw)
I've tried posting a couple of messages about this via gmane.org, but
they still haven't posted to the list, that I can see. Sorry if
people are seeing multiple versions of this.
There is a bug in scm_make_shared_array that causes things to break
when the input array is 1-d. I thought I had a working patch for
this, but I don't. Anyway, the offending line is libguile/unif.c:912:
SCM_I_ARRAY_BASE (ra) = new_min = new_max = i + SCM_I_ARRAY_BASE (oldra);
As far as I can tell, there is a bug somewhere in the SCM_I_ARRAY_BASE
macro that causes things to break when oldra is a 1d uniform array.
The value of the array base seems to be sane for multi-dimensional
arrays, but is something very strange for 1d arrays.
Here's the proof:
<buggy.c>
#include <stdio.h>
#include <libguile.h>
SCM
show_base_wrap(SCM ra) {
size_t base = SCM_I_ARRAY_BASE(ra);
printf("base = %d.\n", base);
return SCM_UNSPECIFIED;
}
void
init_buggy () {
scm_c_define_gsubr("show-base", 1, 0, 0, show_base_wrap);
}
</buggy.c>
Then the scheme code that shows this off would be:
<proof.scm>
#! /bin/bash
exec guile -s "$0" "$@"
!#
(use-modules (ice-9 format))
(setenv "LD_LIBRARY_PATH" (string-append ".:" (getenv "LD_LIBRARY_PATH")))
(load-extension "buggy" "init_buggy")
(define good #2((a b c) (d e f) (g h i)))
(define bad #1(a b c d e f g h i))
(format #t "This one should work:~%~!")
(show-base good)
(format #t "While this one should be weird.~%~!")
(show-base bad)
</proof.scm>
Are there any workarounds for this?
BTW:
GCC 3.4.4
libtool-1.5.2
SuSE 9.3 everything else.
Thanks a bunch.
--
Steve Juranich
Tucson, AZ
USA
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next reply other threads:[~2006-02-27 23:12 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-27 23:12 Steve Juranich [this message]
2006-03-03 23:52 ` Bug in make-shared-array Kevin Ryde
2006-03-11 0:07 ` Neil Jerram
2006-05-01 21:48 ` Marius Vollmer
2006-05-01 22:13 ` Marius Vollmer
2006-05-01 23:07 ` Marius Vollmer
2006-05-03 23:29 ` Kevin Ryde
2006-05-04 17:55 ` Steve Juranich
2006-05-04 21:27 ` Marius Vollmer
2006-06-14 0:45 ` Neil Jerram
-- strict thread matches above, loose matches on Subject: below --
2006-02-27 18:16 Steve Juranich
2006-02-27 16:16 Steve Juranich
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