Hello!
Even though GNU Radio has python bindings with swig or pybind11, the
underlying code c++ symbols are still accessible with GDB. Using Visual
Studio Code and GNU Radio compiled from source with Debug Symbols this is
pretty straightforward:
1) Open up the source tree of gnuradio in visual studio code
2) edit the launch.json and add a C++/GDB configuration where program is
python and args is the output of the GRC rendering
{
"name": "(gdb) Launch",
"type": "cppdbg",
"request": "launch",
"program": "/usr/bin/python3",
"args": ["/path/to/grc_output.py"],
"stopAtEntry": false,
"cwd": "${workspaceFolder}",
"environment": [],
"externalConsole": false,
"MIMode": "gdb",
"setupCommands": [
{
"description": "Enable pretty-printing for gdb",
"text": "-enable-pretty-printing",
"ignoreFailures": true
}
]
},
3) put the breakpoint where you want to hit - note that GR will have been
compiled with optimizations, so the breakpoints might be a bit funky
4) F5 to run the application
If you are debugging your own OOT, this makes it even simpler because you
can compile as "-DCMAKE_BUILD_TYPE=Debug" and then your breakpoints will be
very predictable - in this case you just open up VS code from the root of
your project and follow the same steps.
Hope this helps.
Josh
On Tue, Aug 3, 2021 at 8:41 AM 能书能言 <2127629...@qq.com> wrote:
> Hi guys!
> I want to know how to debug c++ code in gnuradio. As far as I know, after
> we run GRC, a Python file will be generated. The Python file connects
> various blocks, but if I debug this Python file directly, I cannot observe
> the internal operations of the C++ block. I want to know if there is any
> way to let me Can I see the contents of the c++work function when I run the
> python file? It's like executing a pure Python or pure C++ program.
> If this is not possible because of the swig connection method, how can I
> observe the work of a C++ block's work function? If I look at the code
> directly, it is definitely not accurate enough. Can I write a demo by
> myself? Or other ways.
> In addition, how to edit an existing block? I just want to modify its
> function slightly. Do I have to use gr_modtool to create a new OOT module
> and rewrite it based on the contents of the original block? You must also
> use debugging methods when writing, but I don't know how to do it.
> in addition. I have tried the tutorials on the official website, but none
> of them worked. I also checked the previous mailing list, but it was not
> very helpful. I think anyone has a better solution?
> Sincerely
>
>
