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Calculate span info on-demand - #80339

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jyn514:no-span
Apr 25, 2021
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Calculate span info on-demand#80339
bors merged 4 commits into
rust-lang:masterfrom
jyn514:no-span

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@jyn514jyn514 commented Dec 23, 2020•
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  • Add helper attr_span for common reused function
  • Stop storing Spans on Item directly; calculate them on demand instead
  • Special case modules, which have different spans depending on whether
    you use inner or outer attributes
  • Special case impls with fake IDs, which can have either dummy spans (for auto traits) or the DefId of the impl block (for blanket impls)
  • Use a fake ID for primitives instead of the ID of the crate; this lets
    source() know that it should use a dummy span instead of the span of
    the crate.

This shrinks Item from 48 to 40 bytes.

Helps with #76382.

@jyn514jyn514 added the T-rustdoc Relevant to the rustdoc team, which will review and decide on the PR/issue. label Dec 23, 2020
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r? @GuillaumeGomez

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@rust-highfiverust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Dec 23, 2020
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jyn514 commented Dec 23, 2020

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The failure is strange - it looks like the file src/core/slice/ascii.rs.html is no longer being generated? Not sure what that has to do with my changes ... let me try reverting the change to primitive IDs.

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jyn514 commented Dec 23, 2020

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let me try reverting the change to primitive IDs.

that did not help :(

@jyn514jyn514 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 Dec 23, 2020
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@jyn514jyn514 mentioned this pull request Dec 31, 2020
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jyn514force-pushed the no-span branch 2 times, most recently from 5d3d456 to 30d2b24CompareJanuary 8, 2021 01:15
@jyn514jyn514 mentioned this pull request Jan 8, 2021
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bors added a commit to rust-lang-ci/rust that referenced this pull request Jan 14, 2021
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Auto merge ofrust-lang#80802- jyn514:box-attributes, r=nnethercote
c7b0ddb
Box Item::Attributes
This reduces the size of Item from 128 to 40 bytes. I think this is as small as it needs to get 🎉
Builds on rust-lang#80339 and should not be merged before.
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@jyn514jyn514 added I-compilemem Issue: Problems and improvements with respect to memory usage during compilation. I-compiletime Issue: Problems and improvements with respect to compile times. labels Feb 19, 2021
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@rustbotrustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Apr 24, 2021
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jyn514 commented Apr 24, 2021

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Up to -1.2% in instruction counts on many of the -doc benchmarks. Max-rss looks like noise.

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bors commented Apr 24, 2021

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📌 Commit 63a08e6d29463892a0dbdb828aa193454e7c79d8 has been approved by GuillaumeGomez

@borsbors 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 Apr 24, 2021
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Less than what I was hoping for but still great!

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@borsbors 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-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Apr 24, 2021
@jyn514
Add attr_span helper function
a4b6214
@jyn514
Do the hard part first
b412b46
The only bit failing was the module, so change that before removing the
`span` field.
@jyn514
Get rid of item.span
c44c64d
- Remove `span` field, adding `Item::span()` instead
- Special-case `Impl` and `Module` items
- Use dummy spans for primitive items
@jyn514
Finally (finally) ((finally!!!!)) fix spans for the standard library
ba36142
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@bors r=GuillaumeGomez

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📌 Commit ba36142 has been approved by GuillaumeGomez

@borsbors 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 Apr 24, 2021
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bors commented Apr 25, 2021

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⌛ Testing commit ba36142 with merge f7c468f...

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bors commented Apr 25, 2021

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☀️ Test successful - checks-actions
Approved by: GuillaumeGomez
Pushing f7c468f to master...

@borsbors added the merged-by-bors This PR was explicitly merged by bors. label Apr 25, 2021
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bors merged commit f7c468f into rust-lang:masterApr 25, 2021
@rustbotrustbot added this to the 1.53.0 milestone Apr 25, 2021
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jyn514 deleted the no-span branch April 25, 2021 13:43
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I-compilememIssue: Problems and improvements with respect to memory usage during compilation.I-compiletimeIssue: Problems and improvements with respect to compile times.merged-by-borsThis PR was explicitly merged by bors.S-waiting-on-borsStatus: Waiting on bors to run and complete tests. Bors will change the label on completion.T-rustdocRelevant to the rustdoc team, which will review and decide on the PR/issue.

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