# Debugging C++

Debug C++ is tricky and binary protocol bug is hard to locate without debugging support, but setup 
debugging support for bazel project is not easy.

Fury include an out-of-box `launch.json/tasks.json` config in `.vocode` directory for c++ debugging.

Just open the fury root directory in vscode, then open a test file such as `src/fury/row/row_test.cc`,
enter `F5`, then you can debug the c++ code line by line, watch variables, add breakpoints in vscode just like 
java/python debugging.

<img src="images/vscode_debug_fury.jpg" alt="Fury Debugging Example" width="50%" height="50%" />

## Notes

- For Macos: Install `CodeLLDB` vscode plugin
- For Linux: 
  - install gdb for fedora/centos by `sudo yum install -y gdb`
  - install gdb for fedora/centos by `sudo apt-get install gdb`
- If debugging doesn't work, please select correct debug/run options: 
  <img src="images/vscode_select_debug_run.png" alt="select correct debug/run options" width="50%" height="50%" />
- Debug will jump to source files in bazel generated directory, we need to return raw files in source tree 
for debugging again: <img src="images/jmp_generate_file.png" alt="jump to generated files" width="50%" height="50%" />