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10 Jun 2001 16:30:24 -0400 · http://mail.python.org/pipermail/python-dev/2001-June/015342.html

"Tim Peters" <tim.one@home.com> writes:

> Fwd'ing this Skip gem from c.l.py, primarily so I can find it again next
> time I'm thrashing on a Unix box.  gdb clearly needs to adopt Python as its
> extension language.

HP has patches to do this, actually.

Works quite nicely.

And trust me, i've tried to get them to do it more than once.

As I pointed out to skip, if he can profile gdb and tell me where the
slowness is, it's likely I can make it a ton faster. GDB could use
major optimizations almost everywhere.  And i've done quite a lot of
them, they just haven't been reviewed/integrated yet.

--Dan
C++ support maintainer - GDB
DWARF2 reader person - GDB
Symbol table patch submitting weirdo - GDB
etc

> 
> but-then-what-doesn't-ly y'rs  - tim
> 
> -----Original Message-----
> From: python-list-admin@python.org
> [mailto:python-list-admin@python.org]On Behalf Of Skip Montanaro
> Sent: Saturday, June 09, 2001 12:31 AM
> To: python-list@python.org
> Subject: printing Python stack info from gdb
> 
> 
>>From time to time I've wanted to be able to print the Python stack from gdb.
> Today I broke down and spent some time actually implementing something.
> 
>     set $__trimpath = 1
>     define ppystack
> 	set $__fr = 0
> 	select-frame $__fr
> 	while !($pc > Py_Main && $pc < Py_GetArgcArgv)
> 	    if $pc > eval_code2 && $pc < set_exc_info
> 		set $__fn = PyString_AsString(co->co_filename)
> 		set $__n = PyString_AsString(co->co_name)
> 		if $__n[0] == '?'
> 		    set $__n = "<module code>"
> 		end
> 		if $__trimpath
> 		    set $__f = strrchr($__fn, '/')
> 		    if $__f
> 			set $__fn = $__f + 1
> 		    end
> 		end
> 		printf "%s (%d): %s\n", $__fn, f->f_lineno, $__n
> 	    end
> 	    set $__fr = $__fr + 1
> 	    select-frame $__fr
> 	end
> 	select-frame 0
>     end
> 
> Output looks like this (and dribbles out *quite slowly*):
> 
>     Text_Editor.py (147): apply_tag
>     Text_Editor.py (152): apply_tag_by_name
>     Script_GUI.py (302): push_help
>     Script_GUI.py (113): put_help
>     Script_GUI.py (119): focus_enter
>     Signal.py (34): handle_signal
>     Script_GUI.py (324): main
>     Script_GUI.py (338): <module code>
> 
> If you don't want to trim the paths from the filenames, set $__trimpath to
> 0.
> 
> Warning: I've only tried this with a very recent CVS version of Python on a
> PIII-based Linux system with an interpreter compiled using gcc.  I rely on
> the ordering of functions within the while loop to detect when to exit the
> loop and when the frame I'm examining is an eval_code2 frame.  I'm sure
> there are plenty of people out there with more gdb experience than me.  I
> welcome any feedback on ways to improve this little bit of code.
> 
> --
> Skip Montanaro (skip@pobox.com)
> (847)971-7098
> 
> --
> http://mail.python.org/mailman/listinfo/python-list
> 
> 
> _______________________________________________
> Python-Dev mailing list
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> http://mail.python.org/mailman/listinfo/python-dev

-- 
"I saw a man with a wooden leg, and a real foot.
"-Steven Wright

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printing Python stack info from gdb