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crashes: add test for #131451 #133104

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merged 1 commit into from
Dec 8, 2024

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matthiaskrgr
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r? @saethlin
How do I find out which mir opts are involved here? 😅

@rustbot rustbot added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Nov 16, 2024
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This should be scriptable:

First off, try with a lower mir-opt-level. This is just a fast way to trim down the pass list.

Build with -Zdump-mir=all. This will produce a mir_dump directory that has the before and after MIR for every pass that was run on any MIR. This produces a directory called mir_dump/ which contains a bunch of files named like <crate>.<function>.<phase_number>-<pass_number>.<pass_name>.{before,after}.mir.

You should be able to manually enable only the passes that produce a diff in the MIR. The before and after files always differ on the first line because that's a comment that repeats the file's name.

Then trim down that list of passes further, if possible.

@saethlin saethlin 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 Nov 20, 2024
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matthiaskrgr commented Nov 21, 2024

ok ty, I think I got it :D
to get the flags, in the mir-dump dir:

ls -c1 | sort -n | grep after  | grep -o "...-...\..*.after" | cut -c9- | sed 's/\.after$//g'   | sed s/^/\"-Zmir-enable-passes=+/  | sed -e s/$/\",/

Then I throw this into icemaker and let it reduce the flags automatically:
-Zvalidate-mir -Zmir-enable-passes=+DataflowConstProp -Zmir-enable-passes=+Inline
oops these were from a different file that does not require debug assertions
edit: this is

-Clink-dead-code=true -Zmir-enable-passes=+GVN -Zmir-enable-passes=+JumpThreading --crate-type=lib

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Can you drop -Clink-dead-code=true if the fn is pub?

@matthiaskrgr matthiaskrgr force-pushed the crashtest_debugass_131451.rs branch from 6fca409 to 159ed85 Compare December 8, 2024 12:10
@rustbot rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Dec 8, 2024
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@rustbot ready

@rustbot rustbot 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 Dec 8, 2024
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saethlin commented Dec 8, 2024

Nice!
@bors r+ rollup

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bors commented Dec 8, 2024

📌 Commit 159ed85 has been approved by saethlin

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 Dec 8, 2024
bors added a commit to rust-lang-ci/rust that referenced this pull request Dec 8, 2024
…iaskrgr

Rollup of 7 pull requests

Successful merges:

 - rust-lang#131669 (lint: change help for pointers to dyn types in FFI)
 - rust-lang#133104 (crashes: add test for rust-lang#131451)
 - rust-lang#133767 (Add more info on type/trait mismatches for different crate versions)
 - rust-lang#133861 (Add allocate_bytes and refactor allocate_str in InterpCx for raw byte…)
 - rust-lang#133976 (Removed Unnecessary Spaces From RELEASES.md)
 - rust-lang#133987 (Define acronym for thread local storage)
 - rust-lang#133992 (Actually walk into lifetimes and attrs in `EarlyContextAndPass`)

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 5101833 into rust-lang:master Dec 8, 2024
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@rustbot rustbot added this to the 1.85.0 milestone Dec 8, 2024
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Dec 8, 2024
Rollup merge of rust-lang#133104 - matthiaskrgr:crashtest_debugass_131451.rs, r=saethlin

crashes: add test for rust-lang#131451

r? `@saethlin`
How do I find out which mir opts are involved here? 😅
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4 participants