Re: [PATCH v4 11/11] scripts: generate_rust_analyzer.py: use `cfg_groups`

From: Daniel Almeida
Date: Tue Mar 25 2025 - 10:42:54 EST




> On 22 Mar 2025, at 10:23, Tamir Duberstein <tamird@xxxxxxxxx> wrote:
>
> Declare common `cfg`s just once to reduce the size of rust-analyzer.json
> from 30619 to 2624 lines.
>
> Link: https://github.com/rust-lang/rust-analyzer/commit/2607c09fddef36da0d6f0a84625db5e20a5ebde3
> Signed-off-by: Tamir Duberstein <tamird@xxxxxxxxx>
> ---
> scripts/generate_rust_analyzer.py | 35 +++++++++++++++++++++++------------
> 1 file changed, 23 insertions(+), 12 deletions(-)
>
> diff --git a/scripts/generate_rust_analyzer.py b/scripts/generate_rust_analyzer.py
> index 957b413fe0b6..3d89c0198db4 100755
> --- a/scripts/generate_rust_analyzer.py
> +++ b/scripts/generate_rust_analyzer.py
> @@ -37,6 +37,7 @@ class Crate(TypedDict):
> root_module: str
> is_workspace_member: bool
> deps: List[Dependency]
> + cfg_groups: List[str]
> cfg: List[str]
> edition: Literal["2021"]
> env: Dict[str, str]
> @@ -59,15 +60,8 @@ def generate_crates(
> sysroot_src: pathlib.Path,
> external_src: pathlib.Path,
> cfgs: List[str],
> + cfg_groups: List[str],
> ) -> List[Crate]:
> - # Generate the configuration list.
> - cfg = []
> - with open(objtree / "include" / "generated" / "rustc_cfg") as fd:
> - for line in fd:
> - line = line.replace("--cfg=", "")
> - line = line.replace("\n", "")
> - cfg.append(line)
> -
> # Now fill the crates list.
> crates: List[Crate] = []
> crates_cfgs = args_crates_cfgs(cfgs)
> @@ -77,6 +71,7 @@ def generate_crates(
> root_module: pathlib.Path,
> deps: List[Dependency],
> cfg: List[str] = [],
> + cfg_groups: List[str] = [],
> is_workspace_member: bool = True,
> ) -> Crate:
> return {
> @@ -85,6 +80,7 @@ def generate_crates(
> "is_workspace_member": is_workspace_member,
> "deps": deps,
> "cfg": cfg,
> + "cfg_groups": cfg_groups,
> "edition": "2021",
> "env": {
> "RUST_MODFILE": "This is only for rust-analyzer"
> @@ -101,10 +97,13 @@ def generate_crates(
> root_module: pathlib.Path,
> deps: List[Dependency],
> cfg: List[str] = [],
> + cfg_groups: List[str] = [],
> is_workspace_member: bool = True,
> ) -> Dependency:
> return register_crate(
> - build_crate(display_name, root_module, deps, cfg, is_workspace_member)
> + build_crate(
> + display_name, root_module, deps, cfg, cfg_groups, is_workspace_member
> + )
> )
>
> def append_proc_macro_crate(
> @@ -190,7 +189,7 @@ def generate_crates(
> display_name,
> srctree / "rust" / display_name / "lib.rs",
> deps,
> - cfg=cfg,
> + cfg_groups=cfg_groups,
> )
> crate["env"]["OBJTREE"] = str(objtree.resolve(True))
> crate_with_generated: CrateWithGenerated = {
> @@ -252,7 +251,7 @@ def generate_crates(
> name,
> path,
> [core, kernel],
> - cfg=cfg,
> + cfg_groups=cfg_groups,
> )
>
> return crates
> @@ -277,9 +276,21 @@ def main() -> None:
> # Making sure that the `sysroot` and `sysroot_src` belong to the same toolchain.
> assert args.sysroot in args.sysroot_src.parents
>
> + # Generate the configuration list.
> + with open(args.objtree / "include" / "generated" / "rustc_cfg") as fd:
> + cfg_groups = {"rustc_cfg": [line.lstrip("--cfg=").rstrip("\n") for line in fd]}
> +
> rust_project = {
> - "crates": generate_crates(args.srctree, args.objtree, args.sysroot_src, args.exttree, args.cfgs),
> + "crates": generate_crates(
> + args.srctree,
> + args.objtree,
> + args.sysroot_src,
> + args.exttree,
> + args.cfgs,
> + list(cfg_groups.keys()),
> + ),
> "sysroot": str(args.sysroot),
> + "cfg_groups": cfg_groups,
> }
>
> json.dump(rust_project, sys.stdout, sort_keys=True, indent=4)
>
> --
> 2.48.1
>
>

Reviewed-by: Daniel Almeida <daniel.almeida@xxxxxxxxxxxxx>
Tested-by: Daniel Almeida <daniel.almeida@xxxxxxxxxxxxx>