Make treat_err_as_bug Option<NonZeroUsize>
#82255
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r? @davidtwco (rust-highfive has picked a reviewer for you, use r? to override) |
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Historically we haven't tried very much to optimize the slow path (i.e. when an error is emitted). Does this help with normal compilation? (to be clear, I think this is a good change, but if it affects normal perf it should at least have a perf run.) |
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I don't think this has any benefits for compilation on the happy path, so I'm not sure if a perf run is necessary (unless this somehow causes regressions). |
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📌 Commit 8ddd846 has been approved by |
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Rollup of 12 pull requests Successful merges: - rust-lang#79423 (Enable smart punctuation) - rust-lang#81154 (Improve design of `assert_len`) - rust-lang#81235 (Improve suggestion for tuple struct pattern matching errors.) - rust-lang#81769 (Suggest `return`ing tail expressions that match return type) - rust-lang#81837 (Slight perf improvement on char::to_ascii_lowercase) - rust-lang#81969 (Avoid `cfg_if` in `std::os`) - rust-lang#81984 (Make WASI's `hard_link` behavior match other platforms.) - rust-lang#82091 (use PlaceRef abstractions more consistently) - rust-lang#82128 (add diagnostic items for OsString/PathBuf/Owned as well as to_vec on slice) - rust-lang#82166 (add s390x-unknown-linux-musl target) - rust-lang#82234 (Remove query parameters when skipping search results) - rust-lang#82255 (Make `treat_err_as_bug` Option<NonZeroUsize>) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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Use u32 over Option<u32> in DebugLoc ~~Changes `Option<u32>` fields in `DebugLoc` to `Option<NonZeroU32>`. Since the respective fields (`line` and `col`) are guaranteed to be 1-based, this layout optimization is a freebie.~~ EDIT: Changes `Option<u32>` fields in `DebugLoc` to `u32`. As `@bugadani` pointed out, an `Option<NonZeroU32>` is probably an unnecessary layer of abstraction since the `None` variant is always used as `UNKNOWN_LINE_NUMBER` (which is just `0`). Also, `SourceInfo` in `metadata.rs` already uses a `u32` instead of an `Option<u32>` to encode the same information, so I think this change is warranted. Since `@jyn514` raised some concerns over measuring performance in a similar PR (rust-lang#82255), does this need a perf run?
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rustc -Z treat-err-as-bug=Nalready requiresNto be nonzero when the argument is parsed, so changing the type fromOption<usize>toOption<NonZeroUsize>is a low-hanging fruit in terms of layout optimization.