rustdoc-json: Structured attributes #142936

aDotInTheVoid · 2025-06-23T23:28:10Z

Implements #141358.

This has 2 primary benefits.

For rustdoc-json consumers, they no longer need to parse strings of attributes, but it's there in a structured and normalized way. CC @obi1kenobi
For rustc conributors, the output of HIR pretty printing is no longer a versioned thing in the output. People can work on Tracking issue: Attribute refactor #131229 without needing to bump FORMAT_VERSION. CC @jdonszelmann @JonathanBrouwer.

(Over time, as the attribute refractor continues, I expect we'll add new things to rustdoc_json_types::Attribute. But this can be done separately to the rustc changes).

Todo before being mergable:

Update test assertions.
Fix modeling of #[repr].
~~Add tests of #[doc(hidden)] in Item::attrs (probably in a seperate PR).~~ I'm gonna punt this to a future PR
Documentation.

rustbot · 2025-06-23T23:28:15Z

r? @notriddle

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rustbot · 2025-06-23T23:28:18Z

rustdoc-json-types is a public (although nightly-only) API. If possible, consider changing src/librustdoc/json/conversions.rs; otherwise, make sure you bump the FORMAT_VERSION constant.

cc @CraftSpider, @aDotInTheVoid, @Enselic, @obi1kenobi

jdonszelmann · 2025-06-23T23:35:46Z

Awesome alona! I'll take a proper look tomorrow <3

obi1kenobi

I like this!

In the near term cargo-semver-checks will have to internally re-stringify the attributes just for code compatibility with prior rustdoc JSON versions. But I look forward to the day when I can rip all that out and enjoy the structured form instead!

src/rustdoc-json-types/lib.rs

bors · 2025-06-24T05:47:03Z

☔ The latest upstream changes (presumably #142929) made this pull request unmergeable. Please resolve the merge conflicts.

src/rustdoc-json-types/lib.rs

rustbot · 2025-06-24T19:27:17Z

r? @GuillaumeGomez

rustbot has assigned @GuillaumeGomez.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

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rustbot · 2025-06-24T19:27:18Z

These commits modify tests/rustdoc-json.
rustdoc-json is a public (but unstable) interface.

Please ensure that if you've changed the output:

It's intentional.
The FORMAT_VERSION in src/librustdoc-json-types is bumped if necessary.

cc @aDotInTheVoid, @obi1kenobi

aDotInTheVoid · 2025-06-24T19:28:16Z

Now no longer WIP.

When you're happy with it, let me know but don't r+, as I'll need to squash commits.

obi1kenobi

Very nice! Looking forward to this!

obi1kenobi · 2025-06-24T23:23:16Z

src/librustdoc/clean/types.rs

+                // NoMangle is special cased, as it's currently the only structured
+                // attribute that we want to appear in HTML output.


As a separate concern unrelated to this PR, perhaps HTML output should list both #[no_mangle] and #[export_name] in their edition 2024 form i.e. wrapped in unsafe?

Please open an issue then so it's not forgotten.

We already track this in #142835 (comment) (jana is assigned)

tests/rustdoc-json/attrs/must_use.rs

tests/rustdoc-json/attrs/repr_c_int_enum.rs

GuillaumeGomez

Changes look good to me. It's nice to see less is_json conditions in the common code. :)

bors · 2025-06-27T04:59:44Z

☔ The latest upstream changes (presumably #143074) made this pull request unmergeable. Please resolve the merge conflicts.

aDotInTheVoid · 2025-07-07T22:06:46Z

src/rustdoc-json-types/lib.rs

+/// The contents of a `#[repr(...)]` attribute.
+///
+/// Used in [`Attribute::Repr`].
+pub struct AttributeRepr {


CC @workingjubilee, how does this look for a structured representation of a #[repr] attribute?

aDotInTheVoid · 2025-07-07T22:31:20Z

Rebased. I think this is worth reviewing again, as it's changed it response to changes to rustc since intially opening.

@rustbot ready.

obi1kenobi

LGTM, big fan of this overall. A handful of small typo fix nits.

obi1kenobi · 2025-07-08T02:40:11Z

src/librustdoc/clean/types.rs

-                // NoMangle is special cased, as it appears in HTML output, and we want to show it in source form, not HIR printing.
-                // It is also used by cargo-semver-checks.
-                else if let hir::Attribute::Parsed(AttributeKind::NoMangle(..)) = attr {
+                } else if let hir::Attribute::Parsed(AttributeKind::NoMangle(..)) = attr {


A bit of a drive-by, but should we update these to Rust 2024 edition form? #[unsafe(no_mangle)], #[unsafe(export_name = ...)] etc.

Yeah, probably. We try to use latest edition syntax everywhere. Worth filling an issue if there's not one already.

I'll see if I can open a PR and save us all a step or two 👀

src/librustdoc/clean/types.rs

src/librustdoc/json/conversions.rs

src/rustdoc-json-types/lib.rs

obi1kenobi · 2025-07-08T02:50:18Z

src/rustdoc-json-types/lib.rs

+    /// Things here are explicitly *not* covered by the [`FORMAT_VERSION`]
+    /// constant, and may change without bumping the format version.


nit: Since #[doc(hidden)] is super critical to cargo-semver-checks I hope we can be mindful of it with respect to this clause. I wouldn't insist on special-casing it here and I know you are planning to tackle it soon — just wanted to raise a possible concern pre-emptively :)

CC @jdonszelmann , who is doing the #[doc] structure attribute migration according to #131229 (comment).

I think it's doable (and a good idea) to move #[doc(hidden)] out of Other when it gets moved to a structured attribute in HIR. That way we do a format version bump and you're fine. (We may even do this earlier if I/someone gets round to it. But right now tests/rustdoc-json has no tests for the attribute #[doc(hidden)], so I didn't want to make that change here.

Completely fair enough on not making that change here. We should probably have tests for it, though I'm not sure how to make the tests include hidden items 🤔 I'll have a look around and see if I can figure it out, or if you can point me in the right direction, I'll see about opening a PR to add some.

I mostly just don't want this paragraph to be used as justification to break #[doc(hidden)] without bumping the format version and therefore break c-s-c until we move it out of Other :)

Implements rust-lang#141358. This has 2 primary benefits: 1. For rustdoc-json consumers, they no longer need to parse strings of attributes, but it's there in a structured and normalized way. 2. For rustc contributors, the output of HIR pretty printing is no longer a versioned thing in the output. People can work on rust-lang#131229 without needing to bump `FORMAT_VERSION`. (Over time, as the attribute refractor continues, I expect we'll add new things to `rustdoc_json_types::Attribute`. But this can be done separately to the rustc changes).

bors · 2025-07-08T21:28:55Z

☔ The latest upstream changes (presumably #143645) made this pull request unmergeable. Please resolve the merge conflicts.

rustbot assigned notriddle Jun 23, 2025

aDotInTheVoid unassigned notriddle Jun 23, 2025

aDotInTheVoid marked this pull request as draft June 23, 2025 23:28

aDotInTheVoid mentioned this pull request Jun 23, 2025

Rework #[cold] attribute parser #142491

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rustdoc-json: Add test for #[optimize(..)] #142916

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aDotInTheVoid changed the title ~~WIP: rustdoc-json: Structured attributes~~ rustdoc-json: Structured attributes Jun 24, 2025

aDotInTheVoid marked this pull request as ready for review June 24, 2025 19:27

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		// NoMangle is special cased, as it's currently the only structured
		// attribute that we want to appear in HTML output.

		/// Things here are explicitly not covered by the [`FORMAT_VERSION`]
		/// constant, and may change without bumping the format version.

rustdoc-json: Structured attributes #142936

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rustdoc-json: Structured attributes #142936

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