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Store tokens inside ast::Expr #72287

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merged 1 commit into from
May 25, 2020
Merged

Store tokens inside ast::Expr #72287

merged 1 commit into from
May 25, 2020

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Aaron1011
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@Aaron1011 Aaron1011 commented May 17, 2020 •
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This is a smaller version of #70091.

We now store captured tokens inside ast::Expr, which allows us to avoid some reparsing in nt_to_tokenstream. To try to mitigate the performance impact, we only collect tokens when we've seen an outer attribute.

This makes progress towards solving #43081. There are still many things left to do:

  • Collect tokens for other AST items.
  • Come up with a way to handle inner attributes (we need to be collecting tokens by the time we encounter them)
  • Avoid re-parsing when a #[cfg] attr is used.

However, this is enough to fix spans for a simple example, which I've included as a test case.

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label May 17, 2020
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r? @petrochenkov

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Finished benchmarking try commit 2728275cf62b7f7bfb2bbc99674bd8476722477a, comparison URL.

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petrochenkov reviewed May 17, 2020
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src/test/ui/proc-macro/auxiliary/noop-collect.rs Outdated Show resolved Hide resolved
src/librustc_parse/parser/expr.rs Outdated Show resolved Hide resolved
src/librustc_parse/parser/expr.rs Outdated Show resolved Hide resolved
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Not sure why there's such slowdown, absolute majority of expressions doesn't have attributes.
Perhaps it happens due to #72287 (comment)?
(We know that simply increasing the ast::Expr size doesn't result in a slowdown, see #70200.)

@petrochenkov petrochenkov 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 May 17, 2020
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Finished benchmarking try commit 11e2f20befcdd9b10073fe96ba2e880ac822352d, comparison URL.

@petrochenkov petrochenkov 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 May 18, 2020
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Let's make sure that my new collect_tokens implementation isn't slower.

@bors try @rust-timer queue

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Finished benchmarking try commit 7bc7cfa40f58523836318ebc43f17436ce067963, comparison URL.

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FWIW, the code looks mergeable and I'm really excited about the UX improvement.

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I'll review this in detail ~tomorrow, but from a cursory view the collecting mechanism change in librustc_parse/parser/mod.rs looks entirely orthogonal to collecting tokens for expressions specifically.
Could you move it to a separate PR?

@Aaron1011 Aaron1011 mentioned this pull request May 20, 2020
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Aaron1011 commented May 20, 2020 •
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@petrochenkov: I opened #72393 with just the collect_tokens changes

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Blocked on #72393.

@petrochenkov petrochenkov added S-blocked Status: Blocked on something else such as an RFC or other implementation work. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels May 21, 2020
RalfJung added a commit to RalfJung/rust that referenced this pull request May 23, 2020
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Rollup merge of rust-lang#72393 - Aaron1011:feature/rewrite-collect-t…
8e98d8d 
…okens, r=petrochenkov

Rewrite `Parser::collect_tokens`

The previous implementation did not work when called on an opening
delimiter, or when called re-entrantly from the same `TokenCursor` stack
depth.

I'm not sure how to test this apart from rust-lang#72287
RalfJung added a commit to RalfJung/rust that referenced this pull request May 24, 2020
@RalfJung
Rollup merge of rust-lang#72393 - Aaron1011:feature/rewrite-collect-t…
8692c45 
…okens, r=petrochenkov

Rewrite `Parser::collect_tokens`

The previous implementation did not work when called on an opening
delimiter, or when called re-entrantly from the same `TokenCursor` stack
depth.

I'm not sure how to test this apart from rust-lang#72287
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@petrochenkov petrochenkov added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-blocked Status: Blocked on something else such as an RFC or other implementation work. labels May 24, 2020
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@petrochenkov: Rebased

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@bors r+

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bors commented May 24, 2020

📌 Commit 14382c6 has been approved by petrochenkov

@bors 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-author Status: This is awaiting some action (such as code changes or more information) from the author. labels May 24, 2020
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bors commented May 24, 2020

⌛ Testing commit 14382c6 with merge 62da38d...

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bors commented May 25, 2020

☀️ Test successful - checks-azure
Approved by: petrochenkov
Pushing 62da38d to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label May 25, 2020
@bors bors merged commit 62da38d into rust-lang:master May 25, 2020
@Aaron1011 Aaron1011 mentioned this pull request May 25, 2020
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@taiki-e taiki-e mentioned this pull request Jun 25, 2020
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