From: nickrob@snap.net.nz (Nick Roberts)
To: Michael Welsh Duggan <md5i@md5i.com>, 5060@emacsbugs.donarmstrong.com
Subject: bug#5060: More debugging information
Date: Sun, 29 Nov 2009 13:36:05 +1300 [thread overview]
Message-ID: <19217.49653.913430.150725@totara.tehura.co.nz> (raw)
In-Reply-To: <874oofl2aq.fsf@maru.md5i.com>
> Shortly before the failure occurs, gdb-frame-handler is called. In the
> context of the failure, the frame variable is set to:
>
> ((line . "29") (file . "longjmp.c") (func . "__libc_siglongjmp")
> (addr . "0xb79ef6c1") (level . "0"))
>
> gdb-selected-file is nil, since there is no 'fullname.
> gdb-selected-line gets 29. So, gud-last-frame is '(nil . 29).
> gud-display-frame is then called, which calls gud-display-line with the
> args from gud-last frame. I.e., (gud-display-frame nil 29). This nil
> is what is later causing problems when gud-find-file is called.
>
> My guess is that gud-display-frame should not be called if
> gdb-selected-file is nil. But I do not understand the code well enough
> to know that this is the case.
That sounds right. Using gdb-frame-handler to get the current line is a bit of
a hack because gdb doesn't always print the location when it stops. This code
doesn't look quite right. Does the patch below work?
--
Nick http://users.snap.net.nz/~nickrob
*** gdb-mi.el.~1.53.~ 2009-11-03 19:06:46.000000000 +1300
--- gdb-mi.el 2009-11-29 00:41:01.000000000 +1300
*************** overlay arrow in source buffer."
*** 3754,3762 ****
(setq gdb-frame-number (bindat-get-field frame 'level))
(setq gdb-frame-address (bindat-get-field frame 'addr))
(let ((line (bindat-get-field frame 'line)))
! (setq gdb-selected-line (or (and line (string-to-number line))
! nil)) ; don't fail if line is nil
! (when line ; obey the current file only if we have line info
(setq gud-last-frame (cons gdb-selected-file gdb-selected-line))
(gud-display-frame)))
(if gud-overlay-arrow-position
--- 3754,3761 ----
(setq gdb-frame-number (bindat-get-field frame 'level))
(setq gdb-frame-address (bindat-get-field frame 'addr))
(let ((line (bindat-get-field frame 'line)))
! (setq gdb-selected-line (and line (string-to-number line)))
! (when (and gdb-selected-file gdb-selected-line)
(setq gud-last-frame (cons gdb-selected-file gdb-selected-line))
(gud-display-frame)))
(if gud-overlay-arrow-position
next prev parent reply other threads:[~2009-11-29 0:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-28 4:07 bug#5060: More debugging information Michael Welsh Duggan
2009-11-29 0:36 ` Nick Roberts [this message]
2009-11-30 3:59 ` Michael Welsh Duggan
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