Separate dataflow analysis and results #140234
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Every `Results` contains an `Analysis`, but these methods only need the `Analysis`. No point passing them more data than they need.
`Results` contains and `Analysis` and an `EntryStates`. The unfortunate thing about this is that the analysis needs to be mutable everywhere (`&mut Analysis`) which forces the `Results` to be mutable everywhere, even though `EntryStates` is immutable everywhere. To fix this, this commit renames `Results` as `AnalysisAndResults`, renames `EntryStates` as `Results`, and separates the analysis and results as much as possible. (`AnalysisAndResults` doesn't get much use, it's mostly there to facilitate method chaining of `iterate_to_fixpoint`.) `Results` is immutable everywhere, which: - is a bit clearer on how the data is used, - avoids an unnecessary clone of entry states in `locals_live_across_suspend_points`, and - moves the results outside the `RefCell` in Formatter. The commit also reformulates `ResultsHandle` as the generic `CowMut`, which is simpler than `ResultsHandle` because it doesn't need the `'tcx` lifetime and the trait bounds. It also which sits nicely alongside the new use of `Cow` in `ResultsCursor`.
rustbot
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A-rustc-dev-guide
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Some changes occurred to MIR optimizations cc @rust-lang/wg-mir-opt The rustc-dev-guide subtree was changed. If this PR only touches the dev guide consider submitting a PR directly to rust-lang/rustc-dev-guide otherwise thank you for updating the dev guide with your changes. |
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@Jarcho: I hope this doesn't interfere with the uncommitted clippy analyses that you have. From our previous conversation, they required |
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This doesn't look like it will interfere with anything I have. |
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Analysisgets put intoResultswithEntryStates, byiterate_to_fixpoint. This has two problems:Resultsis passed various places where onlyAnalysisis needed.EntryStatesis passed around mutably everywhere even though it is immutable.This commit mostly separates
AnalysisfromResultsand fixes these two problems.r? @davidtwco