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Add `never_patterns` feature gate
This PR adds the feature gate and most basic parsing for the experimental `never_patterns` feature. See the tracking issue (https://github.com/rust-lang/rust/issues/118155) for details on the experiment.
`@scottmcm` has agreed to be my lang-team liaison for this experiment.
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Add `never_patterns` feature gate
This PR adds the feature gate and most basic parsing for the experimental `never_patterns` feature. See the tracking issue (https://github.com/rust-lang/rust/issues/118155) for details on the experiment.
`@scottmcm` has agreed to be my lang-team liaison for this experiment.
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x.py does not support specify multiple --target keywords. The targets must be specified comma separated.
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Rollup of 7 pull requests
Successful merges:
- #116839 (Implement thread parking for xous)
- #118265 (remove the memcpy-on-equal-ptrs assumption)
- #118269 (Unify `TraitRefs` and `PolyTraitRefs` in `ValuePairs`)
- #118394 (Remove HIR opkinds)
- #118398 (Add proper cfgs in std)
- #118419 (Eagerly return `ExprKind::Err` on `yield`/`await` in wrong coroutine context)
- #118422 (Fix coroutine validation for mixed panic strategy)
r? `@ghost`
`@rustbot` modify labels: rollup
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explain tests that disable the provenance GC
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Rollup of 7 pull requests
Successful merges:
- #118342 (Dont suggest `!` for path in function call if it has generic args)
- #118383 (Address unused tuple struct fields in the standard library)
- #118401 (`rustc_ast_lowering` cleanups)
- #118409 (format_foreign.rs: unwrap return Option value for `fn position`, as it always returns Some)
- #118413 (Fix the issue of suggesting unwrap/expect for shorthand field)
- #118425 (Update cargo)
- #118429 (Fix a typo in a `format_args!` note)
r? `@ghost`
`@rustbot` modify labels: rollup
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Fix a typo in a `format_args!` note
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Update cargo
7 commits in 9b13310ca596020a737aaa47daa4ed9ff8898a2f..26333c732095d207aa05932ce863d850fb309386
2023-11-24 16:20:51 +0000 to 2023-11-28 20:07:39 +0000
- docs: link to the packages lint table from the related workspace table (rust-lang/cargo#13057)
- Add more doc comments for gc changes. (rust-lang/cargo#13055)
- docs: Provide pointers for MSRV (rust-lang/cargo#13056)
- Fixed typo in SemVer Compatibility documentation page (rust-lang/cargo#13054)
- refactor: use custom error instead of anyhow (rust-lang/cargo#13050)
- review and remove ignored tests in rustfix (rust-lang/cargo#13047)
- docs: add doc comments for rustfix (rust-lang/cargo#13048)
r? ghost
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r=compiler-errors
Fix the issue of suggesting unwrap/expect for shorthand field
Fixes #118145
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format_foreign.rs: unwrap return Option value for `fn position`, as it always returns Some
Trivial cleanup.
It will be nice to have way to run exhaustiveness analysis on similar cases to see dead code.
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`rustc_ast_lowering` cleanups
Just some cleanups I found while looking through this code.
r? `@spastorino`
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shepmaster:unused-tuple-struct-field-cleanup-stdlib, r=m-ou-se
Address unused tuple struct fields in the standard library
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Dont suggest `!` for path in function call if it has generic args
Fixes #118335
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Fix coroutine validation for mixed panic strategy
Validation introduced in #113124 allows `UnwindAction::Continue` and `TerminatorKind::Resume` to occur only in functions with ABI that can unwind. The function ABI depends on the panic strategy, which can vary across crates.
Usually MIR is built and validated in the same crate. The coroutine drop glue thus far was an exception. As a result validation could fail when mixing different panic strategies.
Avoid the problem by executing `AbortUnwindingCalls` along with the validation.
Fixes #116953.
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Eagerly return `ExprKind::Err` on `yield`/`await` in wrong coroutine context
This PR does 2 things:
1. Refuses to lower `.await` or `yield` when we are outside of the right coroutine context for the operator. Instead, we lower to `hir::ExprKind::Err`, to silence subsequent redundant errors.
2. Reworks a bit of the span tracking in `LoweringContext` to fix a bad span when we have something like `let x = [0; async_fn().await]` where the `await` is inside of an anon const. The span for the "item" still kinda sucks, since it overlaps with the `await` span, but at least it's accurate.
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Add proper cfgs in std
Detected by #118257
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Remove HIR opkinds
`hir::BinOp`, `hir::BinOpKind`, and `hir::UnOp` are identical to `ast::BinOp`, `ast::BinOpKind`, and `ast::UnOp`, respectively. This seems silly, so this PR removes the HIR ones. (A re-export lets the AST ones be referred to using a `hir::` qualifier, which avoids renaming churn.)
r? `@cjgillot`
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Unify `TraitRefs` and `PolyTraitRefs` in `ValuePairs`
I did this recently with `FnSigs` and `PolyFnSigs` but didn't think to do it with `TraitRefs` and `PolyTraitRefs`.
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remove the memcpy-on-equal-ptrs assumption
One of the libc we support, musl, [defines `memcpy` with `restrict` pointers](https://git.musl-libc.org/cgit/musl/tree/src/string/memcpy.c#n5). This in fact matches the definition in the C standard. Calling that `memcpy` with overlapping pointers is clearly UB, who knows what the compiler did when optimizing this `memcpy` -- it certainly assumed source and destination to be disjoint.
Lucky enough, it does not seem like we actually need this assumption that `memcpy(p, p, n)` is always allowed. clang and GCC need it since they use `memcpy` to compile C assignments, but [we use memmove for similar code](https://godbolt.org/z/bcW85WYcM). There are no known cases where LLVM introduces calls to memcpy on equal pointers itself. (And if there were, that would be a soundness bug in rustc due to the musl issue mentioned above.)
This does mean we must make sure to never call the LLVM `memcpy` builtin on equal ranges even though the LangRef says that is allowed. Currently that is the case so we just need to make sure it remains the case. :) Cc `@rust-lang/opsem` `@rust-lang/wg-llvm`
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Implement thread parking for xous
This follows the pattern set by [the Windows parker](https://github.com/rust-lang/rust/blob/ddef56d5dfa18f169af9db912dc8e8343797eebb/library/std/src/sys/windows/thread_parking.rs) when it uses keyed events. An atomic variable is used to track the state and optimize the fast path, while notifications are send via the ticktime server to block and unblock the thread.
ping `@xobs`
`@rustbot` label +T-libs +A-atomic
r? libs
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Cut code size for feature hashing
This locally cuts ~32 kB of .text instructions.
This isn't really a clear win in terms of readability. IMO the code size benefits are worth it (even if they're not necessarily present in the x86_64 hyperoptimized build, I expect them to translate similarly to other platforms). Ultimately there's lots of "small ish" low hanging fruit like this that I'm seeing that seems worth tackling to me, and could translate into larger wins in aggregate.
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They're only used for HTML, so it makes more sense for them to live
their.
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add track_caller for arith ops
Fixes #114814
`#[track_caller]` is works, r? `@scottmcm`
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Remove Stacked Borrows GC heuristics
Removing these has no impact on our benchmarks. I think I initially added these because they have a significant impact on runtime at shorter GC intervals. But both these heuristics result in undesirable memory growth in real programs, especially `modified_since_last_gc`. I didn't realize at the time that required state becomes garbage as a result of changes to _other_ allocations.
I think this nets even primarily because we get better heap reuse. With this change I see almost all the mmap calls coming from our diagnostics infrastructure go away. Not that there were many to start with, but it's an indicator that our memory locality has improved.
Before:
```
Benchmark 1: cargo miri run --manifest-path "/home/ben/miri/bench-cargo-miri/backtraces/Cargo.toml"
Time (mean ± σ): 4.046 s ± 0.087 s [User: 3.952 s, System: 0.085 s]
Range (min … max): 3.952 s … 4.139 s 5 runs
Benchmark 1: cargo miri run --manifest-path "/home/ben/miri/bench-cargo-miri/invalidate/Cargo.toml"
Time (mean ± σ): 6.271 s ± 0.073 s [User: 6.206 s, System: 0.054 s]
Range (min … max): 6.195 s … 6.365 s 5 runs
Benchmark 1: cargo miri run --manifest-path "/home/ben/miri/bench-cargo-miri/mse/Cargo.toml"
Time (mean ± σ): 570.3 ms ± 6.7 ms [User: 505.5 ms, System: 61.8 ms]
Range (min … max): 559.6 ms … 576.0 ms 5 runs
Benchmark 1: cargo miri run --manifest-path "/home/ben/miri/bench-cargo-miri/serde1/Cargo.toml"
Time (mean ± σ): 2.013 s ± 0.012 s [User: 1.938 s, System: 0.069 s]
Range (min … max): 1.994 s … 2.024 s 5 runs
Benchmark 1: cargo miri run --manifest-path "/home/ben/miri/bench-cargo-miri/serde2/Cargo.toml"
Time (mean ± σ): 4.155 s ± 0.082 s [User: 4.078 s, System: 0.067 s]
Range (min … max): 4.011 s … 4.211 s 5 runs
Benchmark 1: cargo miri run --manifest-path "/home/ben/miri/bench-cargo-miri/slice-get-unchecked/Cargo.toml"
Time (mean ± σ): 541.5 ms ± 3.9 ms [User: 477.3 ms, System: 60.0 ms]
Range (min … max): 536.1 ms … 545.1 ms 5 runs
Benchmark 1: cargo miri run --manifest-path "/home/ben/miri/bench-cargo-miri/unicode/Cargo.toml"
Time (mean ± σ): 1.496 s ± 0.002 s [User: 1.442 s, System: 0.050 s]
Range (min … max): 1.494 s … 1.500 s 5 runs
Benchmark 1: cargo miri run --manifest-path "/home/ben/miri/bench-cargo-miri/zip-equal/Cargo.toml"
Time (mean ± σ): 2.190 s ± 0.043 s [User: 2.109 s, System: 0.075 s]
Range (min … max): 2.114 s … 2.215 s 5 runs
```
After:
```
Benchmark 1: cargo miri run --manifest-path "/home/ben/miri/bench-cargo-miri/backtraces/Cargo.toml"
Time (mean ± σ): 3.954 s ± 0.057 s [User: 3.871 s, System: 0.075 s]
Range (min … max): 3.912 s … 4.052 s 5 runs
Benchmark 1: cargo miri run --manifest-path "/home/ben/miri/bench-cargo-miri/invalidate/Cargo.toml"
Time (mean ± σ): 6.200 s ± 0.108 s [User: 6.129 s, System: 0.060 s]
Range (min … max): 6.072 s … 6.295 s 5 runs
Benchmark 1: cargo miri run --manifest-path "/home/ben/miri/bench-cargo-miri/mse/Cargo.toml"
Time (mean ± σ): 575.3 ms ± 9.3 ms [User: 511.5 ms, System: 60.2 ms]
Range (min … max): 558.9 ms … 580.8 ms 5 runs
Benchmark 1: cargo miri run --manifest-path "/home/ben/miri/bench-cargo-miri/serde1/Cargo.toml"
Time (mean ± σ): 1.966 s ± 0.007 s [User: 1.903 s, System: 0.058 s]
Range (min … max): 1.959 s … 1.974 s 5 runs
Benchmark 1: cargo miri run --manifest-path "/home/ben/miri/bench-cargo-miri/serde2/Cargo.toml"
Time (mean ± σ): 4.138 s ± 0.040 s [User: 4.057 s, System: 0.072 s]
Range (min … max): 4.110 s … 4.207 s 5 runs
Benchmark 1: cargo miri run --manifest-path "/home/ben/miri/bench-cargo-miri/slice-get-unchecked/Cargo.toml"
Time (mean ± σ): 541.8 ms ± 5.6 ms [User: 470.7 ms, System: 66.9 ms]
Range (min … max): 535.6 ms … 549.1 ms 5 runs
Benchmark 1: cargo miri run --manifest-path "/home/ben/miri/bench-cargo-miri/unicode/Cargo.toml"
Time (mean ± σ): 1.490 s ± 0.021 s [User: 1.424 s, System: 0.060 s]
Range (min … max): 1.454 s … 1.505 s 5 runs
Benchmark 1: cargo miri run --manifest-path "/home/ben/miri/bench-cargo-miri/zip-equal/Cargo.toml"
Time (mean ± σ): 2.215 s ± 0.048 s [User: 2.113 s, System: 0.072 s]
Range (min … max): 2.183 s … 2.299 s 5 runs
```
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Rollup of 6 pull requests
Successful merges:
- #118193 (Add missing period in `std::process::Command` docs)
- #118222 (unify read_to_end and io::copy impls for reading into a Vec)
- #118323 (give dev-friendly error message for incorrect config profiles)
- #118378 (Perform LTO optimisations with wasm-ld + -Clinker-plugin-lto)
- #118399 (Clean dead codes in miri)
- #118410 (update test for new LLVM 18 codegen)
r? `@ghost`
`@rustbot` modify labels: rollup
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KisaragiEffective:fix_redundant_closure_call_on_closure_returns_async_block, r=llogiq
[`redundant_closure_call`]: avoid duplicated `async` keyword when triggering on closure that returns `async` block
close #11357
----
*Please write a short comment explaining your change (or "none" for internal only changes)*
changelog: [`redundant_closure_call`]: avoid duplicated `async` keyword when triggering on closure that returns `async` block
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Validation introduced in #113124 allows UnwindAction::Continue and
TerminatorKind::Resume to occur only in functions with ABI that can
unwind. The function ABI depends on the panic strategy, which can vary
across crates.
Usually MIR is built and validated in the same crate. The coroutine drop
glue thus far was an exception. As a result validation could fail when
mixing different panic strategies.
Avoid the problem by executing AbortUnwindingCalls along with the
validation.
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with target features outside an unsafe block
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rename `DocMarkdown` pass to `Documentation`
Followup of #11801
This was discussed in todays meeting: https://rust-lang.zulipchat.com/#narrow/stream/257328-clippy/topic/Meeting.202023-11-28/near/404667082
Decided to go with `Documentation`, because this would also make it consistent with how `Attributes` is named in `attrs.rs` (and it also sounds good).
changelog: none
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When encountering a bare assignment in a let-chain, suggest turning the
assignment into a `let` expression or an equality check.
```
error: expected expression, found `let` statement
--> $DIR/bad-if-let-suggestion.rs:5:8
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LL | if let x = 1 && i = 2 {}
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= note: only supported directly in conditions of `if` and `while` expressions
help: you might have meant to continue the let-chain
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LL | if let x = 1 && let i = 2 {}
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help: you might have meant to compare for equality
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LL | if let x = 1 && i == 2 {}
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```
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