[Feature Request]: Reverse debugging

[puremourning]

We should support a way to step backwards. I had the idea of a WinBar button which toggles the direction.

[puremourning]

I pushed a branch reverse-debug which containes a prototype for this. It seems to work with CodeLLDB when using rr

https://github.com/vadimcn/vscode-lldb/blob/master/MANUAL.md#reverse-debugging

Note, you must use:

 "request": "launch",
 "custom": true,'
 "reverseDebugging": true

rather than "request": "custom" ; I'm not sure why codelldb uses this wonky mapping in their vscode extension, but the above works (as in the example in the branch https://github.com/puremourning/vimspector/blob/reverse-debug/tests/testdata/cpp/simple/.vimspector.json#L104-L135)

[puremourning]

Use the new WinBar button (or <plug>VimspectorToggleSteppingDirection to switch between forward and reverse stepping.

Also note that CodeLLDB and indeed dap only implement "reverse step" not "reverse step over" . In practice this means that CodeLLDB steps backward 1 instruction.

In order to step back one line, use the <leader>F10 "run to cursor" mapping and it will run backwards to the cursor.

[phcerdan]

This sounds good @puremourning, any blocker before merging it? If not ready yet, I would love to test it, but please, can I ask you to rebase the reverse-debug branch on top master? I would like to keep latest developments.

[puremourning]

Feel free to rebase and test yourself. I have no time to work on this.