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Debugger: use gdb python pretty printer for the libstdcxx under msys2
ollydbg:
--- Quote from: Suryavarman on March 21, 2021, 12:40:18 am ---It doesn't work for the wx print.
When i find some time i will use "source -p" like wxWidgets team say:
--- Quote ---this file is meant to
# be sourced from gdb using "source -p" (or, better, autoloaded
# in the future...)
--- End quote ---
--- End quote ---
OK, I understand your problem. Here is the method to solve this problem.
First, you download the file
--- Code: ---https://github.com/wxWidgets/wxWidgets/blob/master/misc/gdb/print.py
--- End code ---
For me, I renamed this file to wxprint.py, and I saved it to the same folder as the gdbinit file locates.
Then, I modify the gdbinit file as below:
--- Code: ---python
import sys
sys.path.insert(0, sys.path[0] + '/../../gcc-10.2.0/python')
from libstdcxx.v6.printers import register_libstdcxx_printers
register_libstdcxx_printers (None)
sys.path.insert(0, sys.path[0] + '/../../../etc')
import wxprint
end
--- End code ---
Look at the two lines:
--- Code: ---sys.path.insert(0, sys.path[0] + '/../../../etc')
import wxprint
--- End code ---
The first line adds the current directory of the wxprint.py, and the second line just imports the wxprint.py file. I think the "import" directive us just like the "source" directive in Python, am I correct?
Anyway, this works OK in my msys2. I can have both wxWidgets and C++ std library's pretty printers working when debugging. :)
BTW: I haven't find a simple way to load the wxprint.py file, I just want to avoid the first line, but that line is always needed :(. Maybe, some guys can improve the loading code.
Suryavarman:
It's works. Thank you BlueHazzard ;D
ollydbg:
This is further simplified config when using msys2 based gdb. We can use the macro variables
For the gdb.exe path, just use this string:
--- Code: ---$(TARGET_COMPILER_DIR)bin\gdb.exe
--- End code ---
and to use the gdb initialization script, use this string:
--- Code: ---source $(TARGET_COMPILER_DIR)etc\gdbinit
--- End code ---
See the image shot below:
This make C::B more portable
AndrewCot:
ollydbg. Thanks for the Page and info as I was able to get the wxwidget pretty printing to work with the help form the page. I fell into a few minor holes, which could filed in by updating the page so other people do not fall into the same holes, which are/were:
1) In the Menu->Settings->Debugger settings. Open the debugger plugin setting dialog and uncheck the "Disable startup scripts (-nx) (GDB only)" option.
2) If you are using the https://github.com/wxWidgets/wxWidgets/blob/master/misc/gdb/print.py file then add the following to the gdbinit file:
sys.path.insert(0, 'D:/temp')
from wxprint import register_wxwidgets_printers
register_wxwidgets_printers (None)
Rember to change the directory to where you have saved the print.py file.
3) Update it to change the "source F:\msys64\mingw64\etc\gdbinit" to "source $(TARGET_COMPILER_DIR)etc\gdbinit"
4) You may want to change the note about the "register_libstdcxx_printers(None)" additional line was added to MSYS in https://github.com/msys2/MINGW-packages/pull/6351 (6-Apr-2020) and if people are using a later version then they do not need to do anything.
ollydbg:
Hi, thanks for the response!
--- Quote from: AndrewCot on June 18, 2021, 09:42:18 am ---ollydbg. Thanks for the Page and info as I was able to get the wxwidget pretty printing to work with the help form the page. I fell into a few minor holes, which could filed in by updating the page so other people do not fall into the same holes, which are/were:
1) In the Menu->Settings->Debugger settings. Open the debugger plugin setting dialog and uncheck the "Disable startup scripts (-nx) (GDB only)" option.
--- End quote ---
I think this option should be "checked on", I mean we don't need the startup scripts.
--- Quote ---2) If you are using the https://github.com/wxWidgets/wxWidgets/blob/master/misc/gdb/print.py file then add the following to the gdbinit file:
sys.path.insert(0, 'D:/temp')
from wxprint import register_wxwidgets_printers
register_wxwidgets_printers (None)
Rember to change the directory to where you have saved the print.py file.
--- End quote ---
I don't do like that, I just shows what I did in this post:
Re: Debugger: use gdb python pretty printer for the libstdcxx under msys2
You don't need the "hard-coded path" in those settings.
--- Quote ---3) Update it to change the "source F:\msys64\mingw64\etc\gdbinit" to "source $(TARGET_COMPILER_DIR)etc\gdbinit"
--- End quote ---
This is correct, I also do like this.
--- Quote ---4) You may want to change the note about the "register_libstdcxx_printers(None)" additional line was added to MSYS in https://github.com/msys2/MINGW-packages/pull/6351 (6-Apr-2020) and if people are using a later version then they do not need to do anything.
--- End quote ---
Yes, I think msys2 already has configured the pretty printer for the libstdcxx library, what we need is to add some codes to the "gdbinit" file which support the wx's pretty printer.
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