Rollup of 6 pull requests #69012
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Rollup of 6 pull requests #69012
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Now the line for each statement will show the diff resulting from the combination of `before_statement_effect` and `statement_effect`. It's still possible to observe each in isolation via `borrowck_graphviz_format = "two_phase"`.
including their unnormalized forms. Add more documentation for them.
`InferCtxt` contains six structures within `RefCell`s. Every time we create and dispose of (commit or rollback) a snapshot we have to `borrow_mut` each one of them. This commit moves the six structures under a single `RefCell`, which gives significant speed-ups by reducing the number of `borrow_mut` calls. To avoid runtime errors I had to reduce the lifetimes of dynamic borrows in a couple of places.
This has negligible perf impact, but it does improve the code a bit. * Only query the specialization graph of any trait once instead of once per impl * Loop over impls only once, precomputing impl DefId and TraitRef
This was showing up in profiles. Also deduplicates the code to get just the impl header span.
This was previously a future-compat warning that has since been turned into hard error, but without actually removing all the code. Avoids a call to `traits::overlapping_impls`, which is expensive.
…rCtxt, r=varkor Reduce the number of `RefCell`s in `InferCtxt`. `InferCtxt` contains six structures within `RefCell`s. Every time we create and dispose of (commit or rollback) a snapshot we have to `borrow_mut` each one of them. This commit moves the six structures under a single `RefCell`, which gives significant speed-ups by reducing the number of `borrow_mut` calls. To avoid runtime errors I had to reduce the lifetimes of dynamic borrows in a couple of places. r? @varkor
…arkor Improve performance of coherence checks The biggest perf improvement in here is expected to come from the removal of the remaining rust-lang#43355 warning code since that effectively runs the expensive parts of coherence *twice*, which can even be visualized by obtaining a flamegraph: 
…olnay Make `num::NonZeroX::new` an unstable `const fn` cc rust-lang#53718 These require `#[feature(const_if_match)]`, meaning they must remain unstable for the time being.
… r=Centril Correctly parse `mut a @ b` r? @Centril Closes rust-lang#67861 Closes rust-lang#67926
…phviz, r=wesleywiser Small graphviz improvements for the new dataflow framework Split out from rust-lang#68241. This prints the correct effect diff for each line (the before-effect and the after-effect) and makes marginal improvements to the graphviz output for the new dataflow framework including using monospaced font and better line breaking. This will only be useful when rust-lang#68241 is merged and the graphviz output changes from this:  to this:  r? @wesleywiser
parser: Keep current and previous tokens precisely ...including their unnormalized forms. Add more documentation for them. Hopefully, this will help to eliminate footguns like rust-lang#68728 (comment). I'll try to address the FIXMEs in separate PRs during the next week. r? @Centril
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@bors r+ rollup=never p=6 |
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📌 Commit 18c6d39 has been approved by |
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⌛ Testing commit 18c6d39 with merge c508e9f244f9d5f23ba0541e1c3b3b8381355fe7... |
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💥 Test timed out |
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Feb 10, 2020
Rollup of 6 pull requests Successful merges: - #68694 (Reduce the number of `RefCell`s in `InferCtxt`.) - #68966 (Improve performance of coherence checks) - #68976 (Make `num::NonZeroX::new` an unstable `const fn`) - #68992 (Correctly parse `mut a @ b`) - #69005 (Small graphviz improvements for the new dataflow framework) - #69006 (parser: Keep current and previous tokens precisely) Failed merges: r? @ghost
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☀️ Test successful - checks-azure |
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Successful merges:
RefCells inInferCtxt. #68694 (Reduce the number ofRefCells inInferCtxt.)num::NonZeroX::newan unstableconst fn#68976 (Makenum::NonZeroX::newan unstableconst fn)mut a @ b#68992 (Correctly parsemut a @ b)Failed merges:
r? @ghost