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More rustc_mir_dataflow cleanups #118638

Merged
merged 4 commits into from
Dec 9, 2023
Merged

More rustc_mir_dataflow cleanups #118638

merged 4 commits into from
Dec 9, 2023

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nnethercote
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@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. labels Dec 5, 2023
@nnethercote
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The third commit might be controversial, but the Analysis/GenKillAnalysis situation was bugging me, and this was my best attempt to tame it.

cjgillot
cjgillot reviewed Dec 7, 2023
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I disagree with the 3rd commit. All the logic around gen-kill analyses relies on the exact implementation of the blanket impl you remove. With a macro, we do not enforce the implementation any more (client code could avoid using it), that could lead to inconsistencies and bugs.

compiler/rustc_borrowck/src/dataflow.rs Outdated Show resolved Hide resolved
@nnethercote
Remove unused arguments from ResultsVisitor::visit_block_{start,end}.
f312775
@nnethercote
Remove impl_visitable!.
60e7c68 
It is used just once. With it removed, the relevant code is a little
boilerplate-y but much easier to read, and is the same length. Overall I
think it's an improvement.
@nnethercote
Remove BorrowckAnalyses.
0158404 
This results in two non-generic types being used: `BorrowckResults` and
`BorrowckFlowState`. It's a net reduction in lines of code, and a little
easier to read.
@nnethercote
Tweak GenKillAnalysis.
4b364b6 
`GenKillAnalysis` has five methods that take a transfer function arg:
- `statement_effect`
- `before_statement_effect`
- `terminator_effect`
- `before_terminator_effect`
- `call_return_effect`

All the transfer function args have type `&mut impl GenKill<Self::Idx>`,
except for `terminator_effect`, which takes the simpler `Self::Domain`.

But only the first two need to be `impl GenKill`. The other
three can all be `Self::Domain`, just like `Analysis`. So this commit
changes the last two to take `Self::Domain`, making `GenKillAnalysis`
and `Analysis` more similar.

(Another idea would be to make all these methods `impl GenKill`. But
that doesn't work: `MaybeInitializedPlaces::terminator_effect` requires
the arg be `Self::Domain` so that `self_is_unwind_dead(place, state)`
can be called on it.)
@nnethercote
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I disagree with the 3rd commit.

Ok, fair enough. I have replaced it with a smaller commit that changes the type of the trans arg in two of the GenKillAnalysis methods. Explanation in the commit log.

@nnethercote
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So there are now four commits. The first two are unchanged, the last two are new and need reviewing.

@cjgillot
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cjgillot commented Dec 9, 2023

Thanks!
@bors r+

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bors commented Dec 9, 2023

📌 Commit 4b364b6 has been approved by cjgillot

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 9, 2023
@GuillaumeGomez GuillaumeGomez mentioned this pull request Dec 9, 2023
Merged
bors added a commit to rust-lang-ci/rust that referenced this pull request Dec 9, 2023
@bors
Auto merge of rust-lang#118780 - GuillaumeGomez:rollup-nd0syaf, r=Gui…
08587a5 
…llaumeGomez

Rollup of 6 pull requests

Successful merges:

 - rust-lang#117953 (Add more SIMD platform-intrinsics)
 - rust-lang#118057 (dedup for duplicate suggestions)
 - rust-lang#118638 (More `rustc_mir_dataflow` cleanups)
 - rust-lang#118702 (Strengthen well known check-cfg names and values test)
 - rust-lang#118734 (Unescaping cleanups)
 - rust-lang#118766 (Lower some forgotten spans)

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 546643c into rust-lang:master Dec 9, 2023
11 checks passed
@rustbot rustbot added this to the 1.76.0 milestone Dec 9, 2023
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Dec 9, 2023
@rust-timer
Unrolled build for rust-lang#118638
c9bb0b0 
Rollup merge of rust-lang#118638 - nnethercote:rustc_mir_dataflow-more, r=cjgillot

More `rustc_mir_dataflow` cleanups

r? `@cjgillot`
@nnethercote nnethercote deleted the rustc_mir_dataflow-more branch December 10, 2023 21:19
@nnethercote nnethercote mentioned this pull request Oct 23, 2024
Closed
bors added a commit to rust-lang-ci/rust that referenced this pull request Oct 23, 2024
@bors
Auto merge of rust-lang#132062 - nnethercote:still-more-rustc_mir_dat…
1c188eb 
…aflow-cleanups, r=<try>

Still more `rustc_mir_dataflow` cleanups

A sequel to rust-lang#118203, rust-lang#118230, rust-lang#118638, and rust-lang#131481.

I'm pleased with this PR. It cleans up a few things that have been bugging me for a while. It took quite some effort to find these improvements.

r? `@cjgillot`
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