Re: gdb "automation" question

[Steffen Dettmer <steffen dot dettmer at googlemail dot com>]

* On Tue, Jun 22, 2010 at 6:09 PM, Tom Tromey <tromey@redhat.com> wrote:
> Steffen> define defaction
> Steffen> ? .... other default actions ...
> Steffen> ? define hook-stop
> Steffen> ? ? ?show_log
> Steffen> ? end
> Steffen> end
> Steffen> but I get an error ("This command cannot be used at top level").
>
> At least in the current sources this error only comes from the
> tracepoint code. ?I don't have a tree before 7.0 handy, so if you're
> using something older, maybe upgrading would help this. ?Or maybe the
> "..." includes tracepoint commands?

No, I did not use tracepoints (not supported on platform).

I re-tested with version 7.1, which was the most recent I could
find on http://ftp.gnu.org/gnu/gdb/.
I observed the same issue.

Here a minimal "This command cannot be used at the top level"
example:

------------------------------------------------------------------->8=======
steffen@host:dir/arm-elf $ cat gdb-commands.txt
# Do not edit, automatically generated by make
define defactions
  define hook-stop
    show_log
  end
end
document defactions
  Default actions
end

steffen@host:dir/arm-elf $ /usr/local/build/gdb-7.1/build/gdb/gdb
GNU gdb (GDB) 7.1
 [...]
This GDB was configured as "--host=i686-pc-linux-gnu --target=arm-elf".
 [...]
(gdb) so gdb-commands.txt
/path/dir/arm-elf/gdb-commands.txt:6: Error in sourced command file:
This command cannot be used at the top level.
=======8<-------------------------------------------------------------------

This shows the error without any tracepoint.


Similar attempt, but this blocks / hangs.

First what works:

------------------------------------------------------------------->8=======
steffen@host:dir/arm-elf $ cat gdb-commands.txt
# Do not edit, automatically generated by make
define tr
  disable
  target remote 1.2.3.4:4000
  monitor set appName 829901
  symbol-file 8299011999.elf
end
steffen@host:dir/arm-elf $ /usr/local/build/gdb-7.1/build/gdb/gdb
 [...]
(gdb) so gdb-commands.txt
(gdb) q
=======8<-------------------------------------------------------------------


So this works, but when adding "define hook-stop\n  end" to get rid
of the hook, it hangs:

------------------------------------------------------------------->8=======
steffen@host:dir/arm-elf $ cat gdb-commands.txt
# Do not edit, automatically generated by make
define tr
  disable
  define hook-stop
  end
  target remote 1.2.3.4:4000
  monitor set appName 829901
  symbol-file 8299011999.elf
end
steffen@host:dir/arm-elf $ /usr/local/build/gdb-7.1/build/gdb/gdb
 [...]
(gdb) so gdb-commands.txt
<<<<<<<<<<<<<<<<<< PRESSED CTRL-C >>>>>>>>>>>>>>>>>>
/path/dir/arm-elf/gdb-commands.txt:6: Error in sourced command file:
1.2.3.4:4000: Interrupted system call.
=======8<-------------------------------------------------------------------

Why does it attempt to do anything remotely when adding a
"define"? Shouldn't this just define a new command?



BTW, I cleant my ~/.gdbinit for the test:

------------------------------------------------------------------->8=======
define show_log
  if clogStaticLogBuffer[0] != 0
    printf "%s", clogStaticLogBuffer
  end
  set clogStaticLogBuffer[0] = 0
end
=======8<-------------------------------------------------------------------