Re: [PATCH v3 1/2] scripts: generate_rust_analyzer.py: add versioning infrastructure

[Jesung Yang]

On Mon Mar 16, 2026 at 11:37 PM KST, Tamir Duberstein wrote:
> On 2026-03-15 16:01 +0900, Jesung Yang wrote:
>> On Tue Mar 10, 2026 at 3:34 AM KST, Tamir Duberstein wrote:
>> > On Sun, 08 Mar 2026 08:30:34 +0900, Jesung Yang <y.j3ms.n@xxxxxxxxx> wrote:
>> [...]
>> >> @@ -335,12 +390,90 @@ def generate_crates(
>> >>              append_crate(
>> >>                  name,
>> >>                  path,
>> >> -                [core, kernel, pin_init],
>> >> +                sysroot_deps(core) + [kernel, pin_init],
>> >>                  cfg=generated_cfg,
>> >> +                crate_attrs=["no_std"],
>> >>              )
>> >
>> > Can you help me understand this addition? It's not mentioned except in the
>> > cover letter as a diff from v2.
>> 
>> Assuming you're referring to `crate_attrs=["no_std"]`, this makes
>> rust-analyzer treat crates in `driver/` and `samples/` as if
>> `#![no_std]` were specified in their crate roots (they don't contain
>> `#![no_std]` themselves).
>
> Yes, that's what I was referring to. Still, it's not clear to me why
> that is part of this patch. Is it intentional, or incidental?

Ah, now I see your point. Yes, this should be in `scripts: 
generate_rust_analyzer.py: fix IDE support for primitive types`
(PATCH [2/2]).

>> >> +def generate_rust_project(
>> >> +    version_info: RaVersionInfo,
>> >> +    srctree: pathlib.Path,
>> >> +    objtree: pathlib.Path,
>> >> +    sysroot: pathlib.Path,
>> >> +    sysroot_src: pathlib.Path,
>> >> +    external_src: Optional[pathlib.Path],
>> >> +    cfgs: List[str],
>> >> +    core_edition: str,
>> >> +) -> RustProject:
>> >> +    assert len(BASELINES) == 1, "Exhaustiveness check: update if branches!"
>> >> +
>> >> +    ctx: RaVersionCtx
>> >> +
>> >
>> > Could we make RaVersionInfo an enum? That would allow mypy to do this check
>> > (using `match`) rather than relying on this.
>> 
>> I think you want something like the following?
>> 
>> @enum.unique
>> class RaVersionInfo(enum.Enum):
>>     V20240311 = (
>>         datetime.strptime("2024-03-11", "%Y-%m-%d"),
>>         ra_version=(0, 3, 1877),
>>         rust_version=(1, 78, 0),
>>     )
>>     V20251222 = ( ... )
>> 
>>     def __init__(
>>         self,
>>         release_date: date,
>>         ra_version: Version,
>>         rust_version: Version,
>>     ) -> "RaVersionInfo":
>>         self.release_date = release_date
>>         self.ra_version = ra_version
>>         self.rust_version = rust_version
>> 
>>     @staticmethod
>>     def default() -> "RaVersionInfo":
>>         return RaVersionInfo.V20240311
>> 
>> At the call site, we can access each field via the dot operator. This
>> not only removes `BASELINES` and `DEFAULT_BASELINE` but also ensures
>> that we only match against valid variants, which helps reduce the chance
>> of human error. But unfortunately, `match` was introduced in Python
>> 3.10, whereas the kernel only requires Python 3.9 [1]. This means we
>> cannot leverage mypy's exhaushtiveness check yet. Perhaps I could leave
>> a TODO to remove the assertion and switch to `match` once Python 3.10 is
>> adopted.
>
> That sounds reasonable to me. You can also name the variants in a more
> semantically meaningful way like DEFAULT, SUPPORTS_XXX, etc.

Sounds good to me.

On second thought, I think we can also take advantage of mypy's static
exhaustiveness check by introducing `assert_never`. I'll send v4 and
let's see if it works for you too.

> Finally, `__init__` should return None, not Self.

Absolutely, I'll make that change.

> Thanks for working on this!

My pleasure!

Best regards,
Jesung