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Less TokenTree cloning #114115

Merged
merged 8 commits into from
Jul 28, 2023
Merged

Less TokenTree cloning #114115

merged 8 commits into from
Jul 28, 2023

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nnethercote
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TokenTreeCursor has this comment on it:

// FIXME: Many uses of this can be replaced with by-reference iterator to avoid clones.

This PR completes that FIXME. It doesn't have much perf effect, but at least we now know that.

r? @petrochenkov

@nnethercote
Simplify the ttdelim_span test.
53379a7 
The existing code is a very complex and inefficient way to the get the
span of the last token.
@nnethercote
Replace into_trees with trees in a test.
a9d8459 
There's no need for token tree cloning here.
@nnethercote
Use TokenStream::trees instead of into_trees for attributes.
103bd4a 
This avoids cloning some token trees. A couple of `clone` calls were
inserted, but only on some paths, and the next commit will remove them.
@nnethercote
Make TokenTree::uninterpolate take &self and return a Cow.
55a7324 
Making it similar to `Token::uninterpolate`. This avoids some more token
tree cloning.
@nnethercote
Avoid some token cloning in filter_tokens_from_list.
853f453 
Now the cloning only happens on some paths, instead of all paths.
@nnethercote
Avoid some token tree cloning in decl macro parsing.
d2f7f67 
By changing `into_trees` into `trees`. Some of the subsequent paths
require explicit clones, but not all.
@nnethercote
Avoid into_trees usage in rustfmt.
ee6ed60 
Token tree cloning is only needed in one place.
@nnethercote
Remove Iterator impl for TokenTreeCursor.
4ebf2be 
This is surprising, but the new comment explains why. It's a logical
conclusion in the drive to avoid `TokenTree` clones.

`TokenTreeCursor` is now only used within `Parser`. It's still needed
due to `replace_prev_and_rewind`.
@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-rustdoc Relevant to the rustdoc team, which will review and decide on the PR/issue. labels Jul 27, 2023
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rustbot commented Jul 27, 2023

Some changes occurred in src/tools/rustfmt

cc @rust-lang/rustfmt

@nnethercote
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Best reviewed one commit at a time.

The last commit is quite aggressive, and I could be talked out of it. I was seeing what was the limit of the possibilities here.

Local measurements suggest no significant perf effect, let's confirm that here:

@bors try @rust-timer queue

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@rustbot rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Jul 27, 2023
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bors commented Jul 27, 2023

⌛ Trying commit 4ebf2be with merge 028e606494c3e231dcbd3f8fb891d1709ea275cd...

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bors commented Jul 27, 2023

☀️ Try build successful - checks-actions
Build commit: 028e606494c3e231dcbd3f8fb891d1709ea275cd (028e606494c3e231dcbd3f8fb891d1709ea275cd)

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bors commented Jul 27, 2023

☀️ Try build successful - checks-actions
Build commit: 028e606494c3e231dcbd3f8fb891d1709ea275cd (028e606494c3e231dcbd3f8fb891d1709ea275cd)

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@GuillaumeGomez
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Nice improvement for rustdoc. 👍

@petrochenkov
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@bors r+

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bors commented Jul 27, 2023

📌 Commit 4ebf2be has been approved by petrochenkov

It is now in the queue for this repository.

@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-review Status: Awaiting review from the assignee but also interested parties. labels Jul 27, 2023
@petrochenkov petrochenkov removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Jul 27, 2023
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bors commented Jul 28, 2023

⌛ Testing commit 4ebf2be with merge 0699d99...

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bors commented Jul 28, 2023

☀️ Test successful - checks-actions
Approved by: petrochenkov
Pushing 0699d99 to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label Jul 28, 2023
@bors bors merged commit 0699d99 into rust-lang:master Jul 28, 2023
@rustbot rustbot added this to the 1.73.0 milestone Jul 28, 2023
@bors bors mentioned this pull request Jul 28, 2023
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Finished benchmarking commit (0699d99): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)		 - - 0
Regressions ❌
(secondary)		 2.5% [2.0%, 2.9%] 2
Improvements ✅
(primary)		 -0.4% [-0.4%, -0.4%] 2
Improvements ✅
(secondary)		 -2.9% [-2.9%, -2.9%] 1
All ❌✅ (primary) -0.4% [-0.4%, -0.4%] 2

Cycles

This benchmark run did not return any relevant results for this metric.

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 652.994s -> 653.092s (0.02%)

calebcartwright pushed a commit to calebcartwright/rust that referenced this pull request Oct 23, 2023
@bors
Auto merge of rust-lang#114115 - nnethercote:less-token-tree-cloning,…
1f369f8 
… r=petrochenkov

Less `TokenTree` cloning

`TokenTreeCursor` has this comment on it:
```
// FIXME: Many uses of this can be replaced with by-reference iterator to avoid clones.
```
This PR completes that FIXME. It doesn't have much perf effect, but at least we now know that.

r? `@petrochenkov`
@matthiaskrgr matthiaskrgr mentioned this pull request Feb 11, 2024
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@GuillaumeGomez GuillaumeGomez GuillaumeGomez approved these changes

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@nnethercote @rustbot @rust-timer @bors @GuillaumeGomez @petrochenkov