Use line numbers relative to the function in mir-opt tests #99780

Noratrieb · 2022-07-26T20:19:57Z

As shown in #99770, the line numbers can be a big source of needless and confusing diffs. This PR adds a new flag -Zmir-pretty-relative-line-numbers to make them relative to the function declaration, which avoids most needless diffs from attribute changes.

@JakobDegen told me that there has been a zulip conversation about disabling line numbers with mixed opinions, so I'd like to get some feedback here, for this hopefully better solution.

r? rust-lang/wg-mir-opt

rust-highfive · 2022-07-26T20:20:02Z

r? @estebank

(rust-highfive has picked a reviewer for you, use r? to override)

Noratrieb · 2022-07-26T20:20:33Z

r? rust-lang/mir-opt

klensy · 2022-07-26T21:17:22Z

Maybe reuse already existing style like LL:COL instead of $LINE:$COL?:

rust/src/test/mir-opt/const_prop/control_flow_simplification.hello.ConstProp.diff

Line 18 in c11207e

StorageLive(_2); // scope 0 at $SRC_DIR/std/src/panic.rs:LL:COL

oli-obk · 2022-07-27T10:45:01Z

Maybe we could make this info relative to the function start? That should avoid most of the noise, right?

Noratrieb · 2022-07-27T12:48:06Z

This should avoid most noise, yes. It would probably be a bit tricky to implement with the current code structure, but I could do it. What do you think would be the best way to solve this? Rename -Zmir-pretty-line-numbers to something like -Zmir-pretty-relative-line-numbers and adding a new method on source_map for relative line numbers? The span of the function should be available in mir pretty printing I think.

oli-obk · 2022-07-27T13:17:49Z

Rename -Zmir-pretty-line-numbers to something like-Zmir-pretty-relative-line-numbersand adding a new method onsource_map` for relative line numbers?

that sounds reasonable to me

bors · 2022-07-27T22:13:57Z

☔ The latest upstream changes (presumably #99816) made this pull request unmergeable. Please resolve the merge conflicts.

compiler/rustc_span/src/source_map.rs

oli-obk · 2022-07-28T09:07:02Z

@bors r+ p=1 bitrotty

bors · 2022-07-28T09:07:03Z

📌 Commit ba0af9561870ee2ba942f48a31ed0260f3cb3469 has been approved by oli-obk

It is now in the queue for this repository.

bors · 2022-07-28T09:25:14Z

⌛ Testing commit ba0af9561870ee2ba942f48a31ed0260f3cb3469 with merge 2cba4390459755873c122e7fe462bcc216572595...

Noratrieb · 2022-07-28T12:25:03Z

I figured it out. Maybe it works now.

Dylan-DPC · 2022-07-28T12:33:48Z

@bors r=oli-obk

bors · 2022-07-28T12:33:50Z

📌 Commit 11c0280 has been approved by oli-obk

It is now in the queue for this repository.

Dylan-DPC · 2022-07-28T12:46:50Z

@bors r-

Noratrieb · 2022-07-28T12:46:50Z

I think you're a bit late my friend, but thank you for your log analysis anyways :)

Dylan-DPC · 2022-07-28T12:47:13Z

@bors r=oli-obk

bors · 2022-07-28T12:47:14Z

📌 Commit 11c0280 has been approved by oli-obk

It is now in the queue for this repository.

bors · 2022-07-28T16:22:28Z

⌛ Testing commit 11c0280 with merge 36f4f4a...

bors · 2022-07-28T19:12:15Z

☀️ Test successful - checks-actions
Approved by: oli-obk
Pushing 36f4f4a to master...

rust-timer · 2022-07-28T20:28:25Z

Finished benchmarking commit (36f4f4a): comparison url.

Instruction count

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

Max RSS (memory usage)

Results

Primary benchmarks: mixed results
Secondary benchmarks: mixed results

	mean¹	max	count²
Regressions 😿 (primary)	3.0%	3.0%	1
Regressions 😿 (secondary)	2.0%	2.0%	1
Improvements 🎉 (primary)	-2.1%	-3.0%	2
Improvements 🎉 (secondary)	-3.1%	-3.1%	1
All 😿🎉 (primary)	-0.4%	3.0%	3

Cycles

Results

Primary benchmarks: 😿 relevant regression found
Secondary benchmarks: no relevant changes found

	mean¹	max	count²
Regressions 😿 (primary)	2.5%	2.5%	1
Regressions 😿 (secondary)	N/A	N/A	0
Improvements 🎉 (primary)	N/A	N/A	0
Improvements 🎉 (secondary)	N/A	N/A	0
All 😿🎉 (primary)	2.5%	2.5%	1

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

@rustbot label: -perf-regression

the arithmetic mean of the percent change ↩ ↩²
number of relevant changes ↩ ↩²

Remove comments from mir-opt MIR dumps See https://rust-lang.zulipchat.com/#narrow/stream/189540-t-compiler.2Fwg-mir-opt/topic/Line.20numbers.20in.20mir-opt.20tests/near/363849874 In rust-lang#99780 there is mention that "there has been a zulip conversation about disabling line numbers with mixed opinions" which to me means that some people opposed this. I can't find the referenced conversation so... here we go. The current situation is quite chaotic. It's not hard to find MIR diffs which contain * Absolute line numbers * Relative line numbers * Substituted line numbers (LL) For example: https://github.com/rust-lang/rust/blob/408bbd040613f6776e0a7d05d582c81f4ddc189a/tests/mir-opt/inline/inline_shims.drop.Inline.diff#L10-L17 And sometimes adding a comment at the top of a mir-opt test generates a diff in the test because a line number changed: https://github.com/rust-lang/rust/pull/98112/files#diff-b8cf4bcce95078e6a3faf075e9abf6864872fb28a64d95c04f04513b9e3bbd81 And irrelevant changes to the standard library can generate diffs in mir-opt tests: https://github.com/rust-lang/rust/pull/110694/files#diff-bf96b0e7c67b8b272814536888fd9428c314991e155beae1f0a2a67f0ac47b2c rust-lang@769886c I think we should, specifically in mir-opt tests, completely remove the comments, or insert placeholders for all line and column numbers.

Remove comments from mir-opt MIR dumps See https://rust-lang.zulipchat.com/#narrow/stream/189540-t-compiler.2Fwg-mir-opt/topic/Line.20numbers.20in.20mir-opt.20tests/near/363849874 In rust-lang/rust#99780 there is mention that "there has been a zulip conversation about disabling line numbers with mixed opinions" which to me means that some people opposed this. I can't find the referenced conversation so... here we go. The current situation is quite chaotic. It's not hard to find MIR diffs which contain * Absolute line numbers * Relative line numbers * Substituted line numbers (LL) For example: https://github.com/rust-lang/rust/blob/408bbd040613f6776e0a7d05d582c81f4ddc189a/tests/mir-opt/inline/inline_shims.drop.Inline.diff#L10-L17 And sometimes adding a comment at the top of a mir-opt test generates a diff in the test because a line number changed: https://github.com/rust-lang/rust/pull/98112/files#diff-b8cf4bcce95078e6a3faf075e9abf6864872fb28a64d95c04f04513b9e3bbd81 And irrelevant changes to the standard library can generate diffs in mir-opt tests: https://github.com/rust-lang/rust/pull/110694/files#diff-bf96b0e7c67b8b272814536888fd9428c314991e155beae1f0a2a67f0ac47b2c rust-lang/rust@769886c I think we should, specifically in mir-opt tests, completely remove the comments, or insert placeholders for all line and column numbers.

rust-highfive assigned estebank Jul 26, 2022

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rust-highfive assigned oli-obk and unassigned estebank Jul 26, 2022

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Noratrieb force-pushed the mir-opt-test-line-no branch from bcd07bc to a948491 Compare July 26, 2022 21:02

Noratrieb force-pushed the mir-opt-test-line-no branch from a948491 to f795f79 Compare July 26, 2022 21:37

Noratrieb force-pushed the mir-opt-test-line-no branch from f795f79 to b1640a3 Compare July 27, 2022 18:47

Noratrieb changed the title ~~Don't show line numbers in mir-opt test diffs~~ Use line numbers relative to the function in mir-opt tests Jul 27, 2022

Noratrieb force-pushed the mir-opt-test-line-no branch from b1640a3 to cec398f Compare July 27, 2022 19:01

Noratrieb force-pushed the mir-opt-test-line-no branch from cec398f to c2cb876 Compare July 27, 2022 22:27

JakobDegen mentioned this pull request Jul 28, 2022

Make some const prop mir-opt tests unit-tests #99770

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oli-obk requested changes Jul 28, 2022

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Noratrieb force-pushed the mir-opt-test-line-no branch 2 times, most recently from 3709c2a to ba0af95 Compare July 28, 2022 09:02

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Noratrieb mentioned this pull request Jul 28, 2022

Bad MIR spans #99854

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bors added the merged-by-bors This PR was explicitly merged by bors. label Jul 28, 2022

bors merged commit 36f4f4a into rust-lang:master Jul 28, 2022

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Noratrieb deleted the mir-opt-test-line-no branch July 28, 2022 19:12

This was referenced Jul 28, 2022

Use only ty::Unevaluated<'tcx, ()> in type system #98588

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Enable MIR inlining for generators too #99782

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saethlin mentioned this pull request Jun 6, 2023

Remove comments from mir-opt MIR dumps #112346

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Use line numbers relative to the function in mir-opt tests #99780

Use line numbers relative to the function in mir-opt tests #99780

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