.deps/usr/bin/luajit -- .deps/usr/bin/busted --lpath="./build/?.lua" test/unit/
<
USING GDB

To attach to a running `nvim` process with a pid of 1234 (Tip: the pid of a
running Nvim instance can be obtained by calling |getpid()|), for instance:
>bash
    gdb -tui -p 1234 build/bin/nvim
<
The `gdb` interactive prompt will appear. At any time you can:

- `break foo` to set a breakpoint on the `foo()` function
- `n` to step over the next statement
    - `<Enter>` to repeat the last command
- `s` to step into the next statement
- `c` to continue
- `finish` to step out of the current function
- `p zub` to print the value of `zub`
- `bt` to see a backtrace (callstack) from the current location
- `CTRL-x CTRL-a` or `tui enable` to show a TUI view of the source file in the
  current debugging context. This can be extremely useful as it avoids the
  need for a gdb "frontend".
- `<up>` and `<down>` to scroll the source file view

GDB REVERSE DEBUGGING

- `set record full insn-number-max unlimited`
- `continue` for a bit (at least until `main()` is executed
- `record`
- provoke the bug, then use `revert-next`, `reverse-step`, etc. to rewind the
  debugger

USING GDBSERVER

You may want to connect multiple `gdb` clients to the same running `nvim`
process, or you may want to connect to a remote `nvim` process with a local
`gdb`. Using `gdbserver`, you can attach to a single process and control it
from multiple `gdb` clients.

Open a terminal and start `gdbserver` attached to `nvim` like this:
>bash
    gdbserver :6666 build/bin/nvim 2> gdbserver.log
<
`gdbserver` is now listening on port 6666. You then need to attach to this
debugging session in another terminal:
>bash
    gdb build/bin/nvim
<
Once you've entered `gdb`, you need to attach to the remote session:
>
    (gdb) target remote localhost:6666
<
In case gdbserver puts the TUI as a background process, the TUI can become
unable to read input from pty (and receives SIGTTIN signal) and/or output data
(SIGTTOU signal). To force the TUI as the foreground process, you can add
>c
    signal (SIGTTOU, SIG_IGN);
    if (!tcsetpgrp(data->input.in_fd, getpid())) {
        perror("tcsetpgrp failed");
    }
<
to `tui.c:terminfo_start`.

USING GDBSERVER IN TMUX

Consider using a custom makefile
https://github.com/neovim/neovim/blob/master/BUILD.md#custom-makefile to
quickly start debugging sessions using the `gdbserver` method mentioned above.
This example `local.mk` will create the debugging session when you type
`make debug`.
>make
    .PHONY: dbg-start dbg-attach debug build

    build:
        @$(MAKE) nvim

    dbg-start: build
        @tmux new-window -n 'dbg-neovim' 'gdbserver :6666 ./build/bin/nvim -D'

    dbg-attach:
        @tmux new-window -n 'dbg-cgdb' 'cgdb -x gdb_start.sh ./build/bin/nvim'

    debug: dbg-start dbg-attach
<
Here `gdb_start.sh` includes `gdb` commands to be called when the debugger
starts. It needs to attach to the server started by the `dbg-start` rule. For
example:
>
    (gdb) target remote localhost:6666
    (gdb) br main
<

vim:tw=78:ts=8:et:ft=help:norl: