Rustdoc: Report Layout of enum variants by fee1-dead · Pull Request #86263 · rust-lang/rust

fee1-dead · 2021-06-13T09:52:26Z

Followup of #83501, Fixes#86253.

@rustbot label A-rustdoc

rust-highfive · 2021-06-13T09:52:29Z

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jyn514 · 2021-07-08T12:44:20Z

Can you test what happens for the empty case? Does it show 0 bytes or unsized? I think ideally it would show "uninhabited" or something.

It shows 0 bytes. I think it would be more suitable for a separate PR as a followup of the original PR.

jyn514

r=me with the test case updated

pickfire · 2021-07-10T05:25:46Z

What about Variants::Single?

Then it wouldn't matter because its size is already reported previously.

pickfire · 2021-07-10T05:26:40Z

@fee1-dead Do you have a sample screenshot on how it looks like?

fee1-dead · 2021-07-10T13:40:24Z

@fee1-dead Do you have a sample screenshot on how it looks like?

@rustbot label -S-waiting-on-author S-waiting-on-review

jyn514 · 2021-07-10T21:59:32Z

@fee1-dead hmm, that doesn't seem super helpful - I assume those are all 0 because they don't have fields? Could we avoid showing the size in that case and only report it for fields?

Actually at that point I'm not really sure how much purpose this serves - why wouldn't the user just look at the size shown for the type in the field?

jyn514 · 2021-08-30T21:18:08Z

@camelid do you have opinions on #86263 (comment) ?

camelid · 2021-08-30T21:21:47Z

@camelid do you have opinions on #86263 (comment) ?

I find it annoying to have to click on each field's type to try to manually compute its size, especially if the type is something like Option<(DefId, Foo)>, where I have to manually add up its components, try to figure out what niches there are, and estimate alignment. And it gets especially bothersome for types with many variants like clean::Type.

I think it'd be useful to have a summary of the sizes of each variant.

Is that what you were asking about, or was it something else?

jyn514 · 2021-08-30T21:28:20Z

especially if the type is something like Option<(DefId, Foo)>

👍 makes sense, I hadn't thought about anonymous types. Ok, I think this makes sense then.

Followup of rust-lang#83501, Fixesrust-lang#86253.

GuillaumeGomez · 2021-09-02T18:09:47Z

+// @has type_layout/enum.Variants.html 'Size: '
+// @has - '2 bytes'
+// @has - '<code>A</code>: 0 bytes'
+// @has - '<code>B</code>: 1 byte'


Just to confirm: this checks that this "text" is in the raw HTML directly, right?

What's odd is I tried @has - '<strong>Size:</strong> 8 bytes on master on an existing test case, but it failed. I'm not sure why these tests are passing.

camelid · 2021-09-06T17:53:28Z

Thanks!

@bors r+ rollup

bors · 2021-09-06T17:53:29Z

📌 Commit c0451f7 has been approved by camelid

Rollup of 9 pull requests Successful merges: - rust-lang#86263 (Rustdoc: Report Layout of enum variants) - rust-lang#88541 (Add regression test for rust-lang#74400) - rust-lang#88553 (Improve diagnostics for unary plus operators (rust-lang#88276)) - rust-lang#88594 (More symbolic doc aliases) - rust-lang#88648 (Correct “copies” to “moves” in `<Option<T> as From<T>>::from` doc, and other copyediting) - rust-lang#88691 (Add a regression test for rust-lang#88649) - rust-lang#88694 (Drop 1.56 stabilizations from 1.55 release notes) - rust-lang#88712 (Fix docs for `uX::checked_next_multiple_of`) - rust-lang#88726 (Fix typo in `const_generics` replaced with `adt_const_params` note) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup

Add layout info for enum variant and locals The size of enum variant is what rustdoc shows (rust-lang/rust#86263). I also added layout info for locals since it helps finding size of unnameable types like closures inside other structs or impl traits.

rust-highfive assigned ollie27 Jun 13, 2021

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jun 13, 2021

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fee1-dead force-pushed the rustdoc-layout-variants branch from a6747c4 to 7c87a39Compare June 13, 2021 10:17

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rustbot added the T-rustdoc Relevant to the rustdoc team, which will review and decide on the PR/issue. label Jun 21, 2021

fee1-dead changed the title ~~Report Layout of enum variants~~Rustdoc: Report Layout of enum variantsJun 23, 2021

jyn514 suggested changes Jul 8, 2021
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jyn514 added the requires-nightly This issue requires a nightly compiler in some way. When possible, use a F-* label instead. label Jul 8, 2021

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jyn514 mentioned this pull request Jul 9, 2021
Rustdoc: size layout should show "uninhabited" for empty enums, not 0 #87008
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fee1-dead added 4 commits August 31, 2021 05:24

Report Layout of enum variants
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Followup of rust-lang#83501, Fixesrust-lang#86253.

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Report variant size without the discriminant
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fee1-dead force-pushed the rustdoc-layout-variants branch from ae9e562 to 5f1505eCompare August 31, 2021 05:59

camelid added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Aug 31, 2021

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camelid added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Sep 2, 2021

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Correctly handle niche of enum
c0451f7

fee1-dead force-pushed the rustdoc-layout-variants branch from 5065be6 to c0451f7Compare September 6, 2021 07:11

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Sep 6, 2021

jackh726 mentioned this pull request Sep 8, 2021
Rollup of 9 pull requests #88750
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bors merged commit 2f2aed1 into rust-lang:masterSep 8, 2021

rustbot added this to the 1.57.0 milestone Sep 8, 2021

hkalbasi mentioned this pull request May 18, 2023
feat: Add layout info for enum variant and locals rust-lang/rust-analyzer#14845
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fee1-dead deleted the rustdoc-layout-variants branch July 19, 2024 09:29

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