How to debug a python - c++ program

Question

I got a quite complex distributed programming framework where there are:

a Controller, BC, written in Python as a twisted plugin, which is running on some machine;
N Daemons, BM, written in Python but wrapping a C++ core as a shared library, in the following way:

import imp handle = imp.load_dynamic('mylib', '../libmy.so')

Then each BM talks to the BC via a jsonrpc interaction, but we don't care about this.

What I would do is to debug, possibly in a step into/step over/step debug fashion but not limited to, a BM process, which at the front-end appears as a homogeneous stream of characters in a single terminal.

I'm strongly interested into the C++ part, considering the Python code almost final to release and working well.

Due to this language mixture I'm a bit confused about what type of tool may be useful.

No they can't. Daemons are actually Python code which calls few but essential APIs from C++ library mentioned above. — Patrizio Bertoni
– Patrizio Bertoni, Commented Apr 20, 2015 at 14:31
Well in facts I could build a C++ outer executable representing the work done by Python daemon; but the answer from WakkaDojo reduces the problem to what we're talking about :-) — Patrizio Bertoni
– Patrizio Bertoni, Commented Apr 20, 2015 at 14:38

WakkaDojo · Accepted Answer · 2015-04-20 14:18:34Z

4

You can use gdb on any C/C++ extensions loaded through Python. The way this is done is:

(gdb) target exec python
(gdb) run
 >>> import your_extension as ye
 >>> ye.do_something ()
 >>> # do your python here
 >>> # or just run your python script from here
(gdb) do debugging stuff

You can also add breakpoints/do full C/C++ debugging via gdb. Tip from boost::python docs

edited Apr 20, 2015 at 14:18

answered Apr 20, 2015 at 14:13

WakkaDojo

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