rustc_data_structures cleanups
#124831
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rustc_data_structures cleanups
#124831
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Normal `use` items are nicer.
- `use` before `mod` - `pub` before `non-pub` - Alphabetical order within sections
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Some changes occurred to the CTFE / Miri engine cc @rust-lang/miri |
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RalfJung
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May 7, 2024
RalfJung
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Thanks for the PR, @nnethercote! Looks good to me overall.
Let's do a perf run to see if there is a difference due to the case @RalfJung points out.
SparrowLii
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May 7, 2024
`use` is a nicer way of doing things.
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@michaelwoerister I have addressed the comments. I don't think a perf run is necessary now that I changed the |
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And move the `repr` line after the `derive` line, where it's harder to overlook. (I overlooked it initially, and didn't understand how this type worked.)
It is optimized for lists with a single element, avoiding the need for an allocation in that case. But `SmallVec<[T; 1]>` also avoids the allocation, and is better in general: more standard, log2 number of allocations if the list exceeds one item, and a much more capable API. This commit removes `TinyList` and converts the two uses to `SmallVec<[T; 1]>`. It also reorders the `use` items in the relevant file so they are in just two sections (`pub` and non-`pub`), ordered alphabetically, instead of many sections. (This is a relevant part of the change because I had to decide where to add a `use` item for `SmallVec`.)
It provides a way to effectively embed a linked list within an `IndexVec` and also iterate over that list. It's written in a very generic way, involving two traits `Links` and `LinkElem`. But the `Links` trait is only impl'd for `IndexVec` and `&IndexVec`, and the whole thing is only used in one module within `rustc_borrowck`. So I think it's over-engineered and hard to read. Plus it has no comments. This commit removes it, and adds a (non-generic) local iterator for the use within `rustc_borrowck`. Much simpler.
It's a macro that just creates an enum with a `from_u32` method. It has two arms. One is unused and the other has a single use. This commit inlines that single use and removes the whole macro. This increases readability because we don't have two different macros interacting (`enum_from_u32` and `language_item_table`).
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@bors r=michaelwoerister |
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☀️ Test successful - checks-actions |
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Finished benchmarking commit (37dc766): comparison URL. Overall result: ❌ regressions - no action needed@rustbot label: -perf-regression Instruction countThis is a highly reliable metric that was used to determine the overall result at the top of this comment.
Max RSS (memory usage)ResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
CyclesThis benchmark run did not return any relevant results for this metric. Binary sizeThis benchmark run did not return any relevant results for this metric. Bootstrap: 675.709s -> 676.526s (0.12%) |
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Some improvements I found while looking through this code.
r? @michaelwoerister