Hi Are there any away to debug C module during python debug? Att. Leandro Müller
On 30/03/2020 23:20, Leandro Müller wrote:
Hi Are there any away to debug C module during python debug?
In a word, gdb. I've been doing this quite a lot lately. The trick is to start Python up under gdb, set a pending breakpoint in your C module, then carry on as normal. For example: rhodri@Wildebeest:~/hub_module$ gdb python3 GNU gdb (Ubuntu 8.1-0ubuntu3.2) 8.1.0.20180409-git Copyright (C) 2018 Free Software Foundation, Inc. [...large amounts of boilerplate omitted for brevity...] Reading symbols from python3...Reading symbols from /usr/lib/debug/.build-id/28/7763e881de67a59b31b452dd0161047f7c0135.debug...done. done. (gdb) b Hub_new Function "Hub_new" not defined. Make breakpoint pending on future shared library load? (y or [n]) y Breakpoint 1 (Hub_init) pending. (gdb) run Starting program: /home/rhodri/Work/Lego/hub_module/hat_env/bin/python3 [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Python 3.6.9 (default, Nov 7 2019, 10:44:02) [GCC 8.3.0] on linux Type "help", "copyright", "credits" or "license" for more information.
from hub import hub
Breakpoint 1, Hub_new (type=0x7ffff6236340 <HubType>, args=(), kwds=0x0) at src/hubmodule.c:164 164 HubObject *self = (HubObject *)type->tp_alloc(type, 0); (gdb) ...and off you go! -- Rhodri James *-* Kynesim Ltd
If you're on Windows, another option would be doing a remote attach from Visual Studio C++ -- so, you can start the program under debugging in Python and then do an attach to process from Visual Studio C++. On Mon, Mar 30, 2020 at 9:07 PM Rhodri James <rhodri@kynesim.co.uk> wrote:
On 30/03/2020 23:20, Leandro Müller wrote:
Hi Are there any away to debug C module during python debug?
In a word, gdb.
I've been doing this quite a lot lately. The trick is to start Python up under gdb, set a pending breakpoint in your C module, then carry on as normal. For example:
rhodri@Wildebeest:~/hub_module$ gdb python3 GNU gdb (Ubuntu 8.1-0ubuntu3.2) 8.1.0.20180409-git Copyright (C) 2018 Free Software Foundation, Inc.
[...large amounts of boilerplate omitted for brevity...]
Reading symbols from python3...Reading symbols from
/usr/lib/debug/.build-id/28/7763e881de67a59b31b452dd0161047f7c0135.debug...done. done. (gdb) b Hub_new Function "Hub_new" not defined. Make breakpoint pending on future shared library load? (y or [n]) y Breakpoint 1 (Hub_init) pending. (gdb) run Starting program: /home/rhodri/Work/Lego/hub_module/hat_env/bin/python3 [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Python 3.6.9 (default, Nov 7 2019, 10:44:02) [GCC 8.3.0] on linux Type "help", "copyright", "credits" or "license" for more information.
from hub import hub
Breakpoint 1, Hub_new (type=0x7ffff6236340 <HubType>, args=(), kwds=0x0) at src/hubmodule.c:164 164 HubObject *self = (HubObject *)type->tp_alloc(type, 0); (gdb)
...and off you go!
-- Rhodri James *-* Kynesim Ltd _______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-leave@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/4JVUDRD5... Code of Conduct: http://python.org/psf/codeofconduct/
You can also attach gdb to a running (python) process .. but the interpreter needs to have the symbol table (eg. not stripped). I gave a presentation few years back on this exact topic (sorry for the quality, I was very in-experienced). https://skillsmatter.com/skillscasts/4313-intro-to-python-debug I hope this helps. PS> I'm working on a tiny "relocatable" python interpreter + toolchain using docker (sort of miniconda but for plain python) https://bitbucket.org/cav71/builder3/src/master that might be useful. On Mon, 30 Mar 2020 at 20:07, Rhodri James <rhodri@kynesim.co.uk> wrote:
On 30/03/2020 23:20, Leandro Müller wrote:
Hi Are there any away to debug C module during python debug?
In a word, gdb.
I've been doing this quite a lot lately. The trick is to start Python up under gdb, set a pending breakpoint in your C module, then carry on as normal. For example:
rhodri@Wildebeest:~/hub_module$ gdb python3 GNU gdb (Ubuntu 8.1-0ubuntu3.2) 8.1.0.20180409-git Copyright (C) 2018 Free Software Foundation, Inc.
[...large amounts of boilerplate omitted for brevity...]
Reading symbols from python3...Reading symbols from
/usr/lib/debug/.build-id/28/7763e881de67a59b31b452dd0161047f7c0135.debug...done. done. (gdb) b Hub_new Function "Hub_new" not defined. Make breakpoint pending on future shared library load? (y or [n]) y Breakpoint 1 (Hub_init) pending. (gdb) run Starting program: /home/rhodri/Work/Lego/hub_module/hat_env/bin/python3 [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Python 3.6.9 (default, Nov 7 2019, 10:44:02) [GCC 8.3.0] on linux Type "help", "copyright", "credits" or "license" for more information.
from hub import hub
Breakpoint 1, Hub_new (type=0x7ffff6236340 <HubType>, args=(), kwds=0x0) at src/hubmodule.c:164 164 HubObject *self = (HubObject *)type->tp_alloc(type, 0); (gdb)
...and off you go!
-- Rhodri James *-* Kynesim Ltd _______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-leave@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/4JVUDRD5... Code of Conduct: http://python.org/psf/codeofconduct/
participants (4)
-
Antonio Cavallo -
Fabio Zadrozny -
Leandro Müller -
Rhodri James