Debug support for Zig

[dvmason]

I really like Zed, and the debugger looks awesome, but I'm using Zig, for which there doesn't appear to be support.

According to https://eliasdorneles.com/til/posts/customizing-neovim-debugging-highlight-zig-debug-w-codelldb/ they were able to use codelldb and NeoVIM's DAP UI to debug Zig. It would be amazing if that worked out of the box with Zed.

[dvmason]

Seeing that Rust and Zig both are (at least somewhat) supported by codelldb I added the following to debug.json:

  {
    "label": "fib: Debug native binary",
    "cwd": "$ZED_WORKTREE_ROOT",
    "program": "$ZED_WORKTREE_ROOT/zig/zig-out/bin/fib",
    "sourceLanguages": ["zig"],
    "request": "launch",
    "adapter": "CodeLLDB"
  },

It's not generalized, but it's a start.

First problem is the $ZED_WORKTREE_ROOT doesn't point to where it does in tasks.json, so I hard coded it in. Then f4 runs the right debug, but the code runs to (erroneous) completion, which is a panic: reached unreachable code. So I set a breakpoint, and it shows up in the debug panel correctly, and if I click on it, it correctly shows the corresponding Zig code.

But when I rerun the code (either from the rerun icon in the debug panel, or from f4) I get the same result.

[prime31]

If you use a vs code launch.json file you can use a configuration like this:

        {
            "type": "lldb",
            "request": "launch",
            "name": "Debug executable_name",
            "program": "${workspaceFolder}/zig-out/bin/executable_name",
            "cwd": "${workspaceFolder}"
        },

You can then set breakpoints and use the console but you do not get to see variable values on hover.