Remove restrictions on compare-exchange memory ordering. #98383
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17: Allow CAS failure ordering stronger than success ordering r=taiki-e a=taiki-e See rust-lang/rust#98383 and [p0418r2](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0418r2.html). Co-authored-by: Taiki Endo <te316e89@gmail.com>
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17: Allow CAS failure ordering stronger than success ordering r=taiki-e a=taiki-e See rust-lang/rust#98383 and [p0418r2](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0418r2.html). Co-authored-by: Taiki Endo <te316e89@gmail.com>
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… r=tmiasko Simplify memory ordering intrinsics This changes the names of the atomic intrinsics to always fully include their memory ordering arguments. ```diff - atomic_cxchg + atomic_cxchg_seqcst_seqcst - atomic_cxchg_acqrel + atomic_cxchg_acqrel_release - atomic_cxchg_acqrel_failrelaxed + atomic_cxchg_acqrel_relaxed // And so on. ``` - `seqcst` is no longer implied - The failure ordering on chxchg is no longer implied in some cases, but now always explicitly part of the name. - `release` is no longer shortened to just `rel`. That was especially confusing, since `relaxed` also starts with `rel`. - `acquire` is no longer shortened to just `acq`, such that the names now all match the `std::sync::atomic::Ordering` variants exactly. - This now allows for more combinations on the compare exchange operations, such as `atomic_cxchg_acquire_release`, which is necessary for rust-lang#68464. - This PR only exposes the new possibilities through unstable intrinsics, but not yet through the stable API. That's for [a separate PR](rust-lang#98383) that requires an FCP. Suffixes for operations with a single memory order: | Order | Before | After | |---------|--------------|------------| | Relaxed | `_relaxed` | `_relaxed` | | Acquire | `_acq` | `_acquire` | | Release | `_rel` | `_release` | | AcqRel | `_acqrel` | `_acqrel` | | SeqCst | (none) | `_seqcst` | Suffixes for compare-and-exchange operations with two memory orderings: | Success | Failure | Before | After | |---------|---------|--------------------------|--------------------| | Relaxed | Relaxed | `_relaxed` | `_relaxed_relaxed` | | Relaxed | Acquire | ❌ | `_relaxed_acquire` | | Relaxed | SeqCst | ❌ | `_relaxed_seqcst` | | Acquire | Relaxed | `_acq_failrelaxed` | `_acquire_relaxed` | | Acquire | Acquire | `_acq` | `_acquire_acquire` | | Acquire | SeqCst | ❌ | `_acquire_seqcst` | | Release | Relaxed | `_rel` | `_release_relaxed` | | Release | Acquire | ❌ | `_release_acquire` | | Release | SeqCst | ❌ | `_release_seqcst` | | AcqRel | Relaxed | `_acqrel_failrelaxed` | `_acqrel_relaxed` | | AcqRel | Acquire | `_acqrel` | `_acqrel_acquire` | | AcqRel | SeqCst | ❌ | `_acqrel_seqcst` | | SeqCst | Relaxed | `_failrelaxed` | `_seqcst_relaxed` | | SeqCst | Acquire | `_failacq` | `_seqcst_acquire` | | SeqCst | SeqCst | (none) | `_seqcst_seqcst` |
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… r=tmiasko Simplify memory ordering intrinsics This changes the names of the atomic intrinsics to always fully include their memory ordering arguments. ```diff - atomic_cxchg + atomic_cxchg_seqcst_seqcst - atomic_cxchg_acqrel + atomic_cxchg_acqrel_release - atomic_cxchg_acqrel_failrelaxed + atomic_cxchg_acqrel_relaxed // And so on. ``` - `seqcst` is no longer implied - The failure ordering on chxchg is no longer implied in some cases, but now always explicitly part of the name. - `release` is no longer shortened to just `rel`. That was especially confusing, since `relaxed` also starts with `rel`. - `acquire` is no longer shortened to just `acq`, such that the names now all match the `std::sync::atomic::Ordering` variants exactly. - This now allows for more combinations on the compare exchange operations, such as `atomic_cxchg_acquire_release`, which is necessary for rust-lang#68464. - This PR only exposes the new possibilities through unstable intrinsics, but not yet through the stable API. That's for [a separate PR](rust-lang#98383) that requires an FCP. Suffixes for operations with a single memory order: | Order | Before | After | |---------|--------------|------------| | Relaxed | `_relaxed` | `_relaxed` | | Acquire | `_acq` | `_acquire` | | Release | `_rel` | `_release` | | AcqRel | `_acqrel` | `_acqrel` | | SeqCst | (none) | `_seqcst` | Suffixes for compare-and-exchange operations with two memory orderings: | Success | Failure | Before | After | |---------|---------|--------------------------|--------------------| | Relaxed | Relaxed | `_relaxed` | `_relaxed_relaxed` | | Relaxed | Acquire | ❌ | `_relaxed_acquire` | | Relaxed | SeqCst | ❌ | `_relaxed_seqcst` | | Acquire | Relaxed | `_acq_failrelaxed` | `_acquire_relaxed` | | Acquire | Acquire | `_acq` | `_acquire_acquire` | | Acquire | SeqCst | ❌ | `_acquire_seqcst` | | Release | Relaxed | `_rel` | `_release_relaxed` | | Release | Acquire | ❌ | `_release_acquire` | | Release | SeqCst | ❌ | `_release_seqcst` | | AcqRel | Relaxed | `_acqrel_failrelaxed` | `_acqrel_relaxed` | | AcqRel | Acquire | `_acqrel` | `_acqrel_acquire` | | AcqRel | SeqCst | ❌ | `_acqrel_seqcst` | | SeqCst | Relaxed | `_failrelaxed` | `_seqcst_relaxed` | | SeqCst | Acquire | `_failacq` | `_seqcst_acquire` | | SeqCst | SeqCst | (none) | `_seqcst_seqcst` |
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… r=tmiasko Simplify memory ordering intrinsics This changes the names of the atomic intrinsics to always fully include their memory ordering arguments. ```diff - atomic_cxchg + atomic_cxchg_seqcst_seqcst - atomic_cxchg_acqrel + atomic_cxchg_acqrel_release - atomic_cxchg_acqrel_failrelaxed + atomic_cxchg_acqrel_relaxed // And so on. ``` - `seqcst` is no longer implied - The failure ordering on chxchg is no longer implied in some cases, but now always explicitly part of the name. - `release` is no longer shortened to just `rel`. That was especially confusing, since `relaxed` also starts with `rel`. - `acquire` is no longer shortened to just `acq`, such that the names now all match the `std::sync::atomic::Ordering` variants exactly. - This now allows for more combinations on the compare exchange operations, such as `atomic_cxchg_acquire_release`, which is necessary for rust-lang#68464. - This PR only exposes the new possibilities through unstable intrinsics, but not yet through the stable API. That's for [a separate PR](rust-lang#98383) that requires an FCP. Suffixes for operations with a single memory order: | Order | Before | After | |---------|--------------|------------| | Relaxed | `_relaxed` | `_relaxed` | | Acquire | `_acq` | `_acquire` | | Release | `_rel` | `_release` | | AcqRel | `_acqrel` | `_acqrel` | | SeqCst | (none) | `_seqcst` | Suffixes for compare-and-exchange operations with two memory orderings: | Success | Failure | Before | After | |---------|---------|--------------------------|--------------------| | Relaxed | Relaxed | `_relaxed` | `_relaxed_relaxed` | | Relaxed | Acquire | ❌ | `_relaxed_acquire` | | Relaxed | SeqCst | ❌ | `_relaxed_seqcst` | | Acquire | Relaxed | `_acq_failrelaxed` | `_acquire_relaxed` | | Acquire | Acquire | `_acq` | `_acquire_acquire` | | Acquire | SeqCst | ❌ | `_acquire_seqcst` | | Release | Relaxed | `_rel` | `_release_relaxed` | | Release | Acquire | ❌ | `_release_acquire` | | Release | SeqCst | ❌ | `_release_seqcst` | | AcqRel | Relaxed | `_acqrel_failrelaxed` | `_acqrel_relaxed` | | AcqRel | Acquire | `_acqrel` | `_acqrel_acquire` | | AcqRel | SeqCst | ❌ | `_acqrel_seqcst` | | SeqCst | Relaxed | `_failrelaxed` | `_seqcst_relaxed` | | SeqCst | Acquire | `_failacq` | `_seqcst_acquire` | | SeqCst | SeqCst | (none) | `_seqcst_seqcst` |
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… r=tmiasko Simplify memory ordering intrinsics This changes the names of the atomic intrinsics to always fully include their memory ordering arguments. ```diff - atomic_cxchg + atomic_cxchg_seqcst_seqcst - atomic_cxchg_acqrel + atomic_cxchg_acqrel_release - atomic_cxchg_acqrel_failrelaxed + atomic_cxchg_acqrel_relaxed // And so on. ``` - `seqcst` is no longer implied - The failure ordering on chxchg is no longer implied in some cases, but now always explicitly part of the name. - `release` is no longer shortened to just `rel`. That was especially confusing, since `relaxed` also starts with `rel`. - `acquire` is no longer shortened to just `acq`, such that the names now all match the `std::sync::atomic::Ordering` variants exactly. - This now allows for more combinations on the compare exchange operations, such as `atomic_cxchg_acquire_release`, which is necessary for rust-lang#68464. - This PR only exposes the new possibilities through unstable intrinsics, but not yet through the stable API. That's for [a separate PR](rust-lang#98383) that requires an FCP. Suffixes for operations with a single memory order: | Order | Before | After | |---------|--------------|------------| | Relaxed | `_relaxed` | `_relaxed` | | Acquire | `_acq` | `_acquire` | | Release | `_rel` | `_release` | | AcqRel | `_acqrel` | `_acqrel` | | SeqCst | (none) | `_seqcst` | Suffixes for compare-and-exchange operations with two memory orderings: | Success | Failure | Before | After | |---------|---------|--------------------------|--------------------| | Relaxed | Relaxed | `_relaxed` | `_relaxed_relaxed` | | Relaxed | Acquire | ❌ | `_relaxed_acquire` | | Relaxed | SeqCst | ❌ | `_relaxed_seqcst` | | Acquire | Relaxed | `_acq_failrelaxed` | `_acquire_relaxed` | | Acquire | Acquire | `_acq` | `_acquire_acquire` | | Acquire | SeqCst | ❌ | `_acquire_seqcst` | | Release | Relaxed | `_rel` | `_release_relaxed` | | Release | Acquire | ❌ | `_release_acquire` | | Release | SeqCst | ❌ | `_release_seqcst` | | AcqRel | Relaxed | `_acqrel_failrelaxed` | `_acqrel_relaxed` | | AcqRel | Acquire | `_acqrel` | `_acqrel_acquire` | | AcqRel | SeqCst | ❌ | `_acqrel_seqcst` | | SeqCst | Relaxed | `_failrelaxed` | `_seqcst_relaxed` | | SeqCst | Acquire | `_failacq` | `_seqcst_acquire` | | SeqCst | SeqCst | (none) | `_seqcst_seqcst` |
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Rollup of 6 pull requests Successful merges: - rust-lang#98383 (Remove restrictions on compare-exchange memory ordering.) - rust-lang#99350 (Be more precise when suggesting removal of parens on unit ctor) - rust-lang#99356 (Do not constraint TAITs when checking impl/trait item compatibility) - rust-lang#99360 (Do not ICE when we have `-Zunpretty=expanded` with invalid ABI) - rust-lang#99373 (Fix source code sidebar tree auto-expand) - rust-lang#99374 (Fix doc for `rchunks_exact`) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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The restriction that success ordering must be at least as strong as its failure ordering in compare-exchange operations was lifted in rust-lang#98383.
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add support for new RMW orders Implements support for rust-lang/rust#98383. Also restructure intrinsic shims a bit so we have atomic and SIMD intrinsics in their own file, and refactor atomic intrinsic name parsing.
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Update invalid atomic ordering lint The restriction that success ordering must be at least as strong as its failure ordering in compare-exchange operations was lifted in rust-lang#98383.
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Update invalid atomic ordering lint The restriction that success ordering must be at least as strong as its failure ordering in compare-exchange operations was lifted in rust-lang#98383.
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Update invalid atomic ordering lint The restriction that success ordering must be at least as strong as its failure ordering in compare-exchange operations was lifted in rust-lang#98383.
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* Add a test for atomic operations introduced in rust-lang#97423 & rust-lang#98383. * Add a test for fallback code generation strategy used on LLVM 12 introduced in rust-lang#98385. Use a separate test case instead of a revision system since test will be gone once LLVM 12 is no longer supported.
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Test codegen of atomic compare-exchange with additional memory orderings * Add a test for atomic operations introduced in rust-lang#97423 & rust-lang#98383. * Add a test for fallback code generation strategy used on LLVM 12 introduced in rust-lang#98385. Use a separate test case instead of a revision system since test will be gone once LLVM 12 is no longer supported.
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Simplify memory ordering intrinsics This changes the names of the atomic intrinsics to always fully include their memory ordering arguments. ```diff - atomic_cxchg + atomic_cxchg_seqcst_seqcst - atomic_cxchg_acqrel + atomic_cxchg_acqrel_release - atomic_cxchg_acqrel_failrelaxed + atomic_cxchg_acqrel_relaxed // And so on. ``` - `seqcst` is no longer implied - The failure ordering on chxchg is no longer implied in some cases, but now always explicitly part of the name. - `release` is no longer shortened to just `rel`. That was especially confusing, since `relaxed` also starts with `rel`. - `acquire` is no longer shortened to just `acq`, such that the names now all match the `std::sync::atomic::Ordering` variants exactly. - This now allows for more combinations on the compare exchange operations, such as `atomic_cxchg_acquire_release`, which is necessary for #68464. - This PR only exposes the new possibilities through unstable intrinsics, but not yet through the stable API. That's for [a separate PR](rust-lang/rust#98383) that requires an FCP. Suffixes for operations with a single memory order: | Order | Before | After | |---------|--------------|------------| | Relaxed | `_relaxed` | `_relaxed` | | Acquire | `_acq` | `_acquire` | | Release | `_rel` | `_release` | | AcqRel | `_acqrel` | `_acqrel` | | SeqCst | (none) | `_seqcst` | Suffixes for compare-and-exchange operations with two memory orderings: | Success | Failure | Before | After | |---------|---------|--------------------------|--------------------| | Relaxed | Relaxed | `_relaxed` | `_relaxed_relaxed` | | Relaxed | Acquire | ❌ | `_relaxed_acquire` | | Relaxed | SeqCst | ❌ | `_relaxed_seqcst` | | Acquire | Relaxed | `_acq_failrelaxed` | `_acquire_relaxed` | | Acquire | Acquire | `_acq` | `_acquire_acquire` | | Acquire | SeqCst | ❌ | `_acquire_seqcst` | | Release | Relaxed | `_rel` | `_release_relaxed` | | Release | Acquire | ❌ | `_release_acquire` | | Release | SeqCst | ❌ | `_release_seqcst` | | AcqRel | Relaxed | `_acqrel_failrelaxed` | `_acqrel_relaxed` | | AcqRel | Acquire | `_acqrel` | `_acqrel_acquire` | | AcqRel | SeqCst | ❌ | `_acqrel_seqcst` | | SeqCst | Relaxed | `_failrelaxed` | `_seqcst_relaxed` | | SeqCst | Acquire | `_failacq` | `_seqcst_acquire` | | SeqCst | SeqCst | (none) | `_seqcst_seqcst` |
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Pkgsrc changes: * Add patch to fix vendor/kqueue issue (on 32-bit hosts) * Adjust other patches & line numbers * Version bumps & checksum changes. Upstream changes: Version 1.64.0 (2022-09-22) =========================== Language -------- - [Unions with mutable references or tuples of allowed types are now allowed](rust-lang/rust#97995) - It is now considered valid to deallocate memory pointed to by a shared reference `&T` [if every byte in `T` is inside an `UnsafeCell`](rust-lang/rust#98017) - Unused tuple struct fields are now warned against in an allow-by-default lint, [`unused_tuple_struct_fields`] (rust-lang/rust#95977), similar to the existing warning for unused struct fields. This lint will become warn-by-default in the future. Compiler -------- - [Add Nintendo Switch as tier 3 target] (rust-lang/rust#88991) - Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. - [Only compile `#[used]` as llvm.compiler.used for ELF targets] (rust-lang/rust#93718) - [Add the `--diagnostic-width` compiler flag to define the terminal width.] (rust-lang/rust#95635) - [Add support for link-flavor `rust-lld` for iOS, tvOS and watchOS] (rust-lang/rust#98771) Libraries --------- - [Remove restrictions on compare-exchange memory ordering.] (rust-lang/rust#98383) - You can now `write!` or `writeln!` into an `OsString`: [Implement `fmt::Write` for `OsString`](rust-lang/rust#97915) - [Make RwLockReadGuard covariant] (rust-lang/rust#96820) - [Implement `FusedIterator` for `std::net::[Into]Incoming`] (rust-lang/rust#97300) - [`impl<T: AsRawFd> AsRawFd for {Arc,Box}<T>`] (rust-lang/rust#97437) - [`ptr::copy` and `ptr::swap` are doing untyped copies] (rust-lang/rust#97712) - [Add cgroupv1 support to `available_parallelism`] (rust-lang/rust#97925) - [Mitigate many incorrect uses of `mem::uninitialized`] (rust-lang/rust#99182) Stabilized APIs --------------- - [`future::IntoFuture`] (https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html) - [`future::poll_fn`] (https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html) - [`task::ready!`] (https://doc.rust-lang.org/stable/std/task/macro.ready.html) - [`num::NonZero*::checked_mul`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul) - [`num::NonZero*::checked_pow`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow) - [`num::NonZero*::saturating_mul`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul) - [`num::NonZero*::saturating_pow`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_pow) - [`num::NonZeroI*::abs`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.abs) - [`num::NonZeroI*::checked_abs`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.checked_abs) - [`num::NonZeroI*::overflowing_abs`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.overflowing_abs) - [`num::NonZeroI*::saturating_abs`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.saturating_abs) - [`num::NonZeroI*::unsigned_abs`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.unsigned_abs) - [`num::NonZeroI*::wrapping_abs`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.wrapping_abs) - [`num::NonZeroU*::checked_add`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_add) - [`num::NonZeroU*::checked_next_power_of_two`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_next_power_of_two) - [`num::NonZeroU*::saturating_add`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_add) - [`os::unix::process::CommandExt::process_group`] (https://doc.rust-lang.org/stable/std/os/unix/process/trait.CommandExt.html#tymethod.process_group) - [`os::windows::fs::FileTypeExt::is_symlink_dir`] (https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir) - [`os::windows::fs::FileTypeExt::is_symlink_file`] (https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file) These types were previously stable in `std::ffi`, but are now also available in `core` and `alloc`: - [`core::ffi::CStr`] (https://doc.rust-lang.org/stable/core/ffi/struct.CStr.html) - [`core::ffi::FromBytesWithNulError`] (https://doc.rust-lang.org/stable/core/ffi/struct.FromBytesWithNulError.html) - [`alloc::ffi::CString`] (https://doc.rust-lang.org/stable/alloc/ffi/struct.CString.html) - [`alloc::ffi::FromVecWithNulError`] (https://doc.rust-lang.org/stable/alloc/ffi/struct.FromVecWithNulError.html) - [`alloc::ffi::IntoStringError`] (https://doc.rust-lang.org/stable/alloc/ffi/struct.IntoStringError.html) - [`alloc::ffi::NulError`] (https://doc.rust-lang.org/stable/alloc/ffi/struct.NulError.html) These types were previously stable in `std::os::raw`, but are now also available in `core::ffi` and `std::ffi`: - [`ffi::c_char`] (https://doc.rust-lang.org/stable/std/ffi/type.c_char.html) - [`ffi::c_double`] (https://doc.rust-lang.org/stable/std/ffi/type.c_double.html) - [`ffi::c_float`] (https://doc.rust-lang.org/stable/std/ffi/type.c_float.html) - [`ffi::c_int`] (https://doc.rust-lang.org/stable/std/ffi/type.c_int.html) - [`ffi::c_long`] (https://doc.rust-lang.org/stable/std/ffi/type.c_long.html) - [`ffi::c_longlong`] (https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html) - [`ffi::c_schar`] (https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html) - [`ffi::c_short`] (https://doc.rust-lang.org/stable/std/ffi/type.c_short.html) - [`ffi::c_uchar`] (https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html) - [`ffi::c_uint`] (https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html) - [`ffi::c_ulong`] (https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html) - [`ffi::c_ulonglong`] (https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html) - [`ffi::c_ushort`] (https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html) These APIs are now usable in const contexts: - [`slice::from_raw_parts`] (https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html) Cargo ----- - [Packages can now inherit settings from the workspace so that the settings can be centralized in one place.] (rust-lang/cargo#10859) See [`workspace.package`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacepackage-table) and [`workspace.dependencies`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacedependencies-table) for more details on how to define these common settings. - [Cargo commands can now accept multiple `--target` flags to build for multiple targets at once] (rust-lang/cargo#10766), and the [`build.target`](https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildtarget) config option may now take an array of multiple targets. - [The `--jobs` argument can now take a negative number to count backwards from the max CPUs.] (rust-lang/cargo#10844) - [`cargo add` will now update `Cargo.lock`.] (rust-lang/cargo#10902) - [Added](rust-lang/cargo#10838) the [`--crate-type`](https://doc.rust-lang.org/nightly/cargo/commands/cargo-rustc.html#option-cargo-rustc---crate-type) flag to `cargo rustc` to override the crate type. - [Significantly improved the performance fetching git dependencies from GitHub when using a hash in the `rev` field.] (rust-lang/cargo#10079) Misc ---- - [The `rust-analyzer` rustup component is now available on the stable channel.] (rust-lang/rust#98640) Compatibility Notes ------------------- - The minimum required versions for all `-linux-gnu` targets are now at least kernel 3.2 and glibc 2.17, for targets that previously supported older versions: [Increase the minimum linux-gnu versions](rust-lang/rust#95026) - [Network primitives are now implemented with the ideal Rust layout, not the C system layout] (rust-lang/rust#78802). This can cause problems when transmuting the types. - [Add assertion that `transmute_copy`'s `U` is not larger than `T`] (rust-lang/rust#98839) - [A soundness bug in `BTreeMap` was fixed] (rust-lang/rust#99413) that allowed data it was borrowing to be dropped before the container. - [The Drop behavior of C-like enums cast to ints has changed] (rust-lang/rust#96862). These are already discouraged by a compiler warning. - [Relate late-bound closure lifetimes to parent fn in NLL] (rust-lang/rust#98835) - [Errors at const-eval time are now in future incompatibility reports] (rust-lang/rust#97743) - On the `thumbv6m-none-eabi` target, some incorrect `asm!` statements were erroneously accepted if they used the high registers (r8 to r14) as an input/output operand. [This is no longer accepted] (rust-lang/rust#99155). - [`impl Trait` was accidentally accepted as the associated type value of return-position `impl Trait`] (rust-lang/rust#97346), without fulfilling all the trait bounds of that associated type, as long as the hidden type satisfies said bounds. This has been fixed. Internal Changes ---------------- These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - Windows builds now use profile-guided optimization, providing 10-20% improvements to compiler performance: [Utilize PGO for windows x64 rustc dist builds] (rust-lang/rust#96978) - [Stop keeping metadata in memory before writing it to disk] (rust-lang/rust#96544) - [compiletest: strip debuginfo by default for mode=ui] (rust-lang/rust#98140) - Many improvements to generated code for derives, including performance improvements: - [Don't use match-destructuring for derived ops on structs.] (rust-lang/rust#98446) - [Many small deriving cleanups] (rust-lang/rust#98741) - [More derive output improvements] (rust-lang/rust#98758) - [Clarify deriving code](rust-lang/rust#98915) - [Final derive output improvements] (rust-lang/rust#99046) - [Stop injecting `#[allow(unused_qualifications)]` in generated `derive` implementations](rust-lang/rust#99485) - [Improve `derive(Debug)`](rust-lang/rust#98190) - [Bump to clap 3](rust-lang/rust#98213) - [fully move dropck to mir](rust-lang/rust#98641) - [Optimize `Vec::insert` for the case where `index == len`.] (rust-lang/rust#98755) - [Convert rust-analyzer to an in-tree tool] (rust-lang/rust#99603)
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Pkgsrc changes: * This package now contains rust-analyzer, so implicitly conflicts with that pkgsrc package. The same goes for the rust-src package. * Add NetBSD/arm6 port * Add unfinished NetBSD/mipsel port * Revert the use of the internal LLVM, should now build with the new pkgsrc LLVM (15). * Add depndence on compat80 for sparc64 to fix the build * Adapt patches * Add CHECK_INTERPRETER_SKIP for a few (mostly unused) files. (A proper fix may come later.) Upstream changes: Version 1.64.0 (2022-09-22) =========================== Language -------- - [Unions with mutable references or tuples of allowed types are now allowed](rust-lang/rust#97995) - It is now considered valid to deallocate memory pointed to by a shared reference `&T` [if every byte in `T` is inside an `UnsafeCell`](rust-lang/rust#98017) - Unused tuple struct fields are now warned against in an allow-by-default lint, [`unused_tuple_struct_fields`] (rust-lang/rust#95977), similar to the existing warning for unused struct fields. This lint will become warn-by-default in the future. Compiler -------- - [Add Nintendo Switch as tier 3 target] (rust-lang/rust#88991) - Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. - [Only compile `#[used]` as llvm.compiler.used for ELF targets] (rust-lang/rust#93718) - [Add the `--diagnostic-width` compiler flag to define the terminal width.] (rust-lang/rust#95635) - [Add support for link-flavor `rust-lld` for iOS, tvOS and watchOS] (rust-lang/rust#98771) Libraries --------- - [Remove restrictions on compare-exchange memory ordering.] (rust-lang/rust#98383) - You can now `write!` or `writeln!` into an `OsString`: [Implement `fmt::Write` for `OsString`](rust-lang/rust#97915) - [Make RwLockReadGuard covariant] (rust-lang/rust#96820) - [Implement `FusedIterator` for `std::net::[Into]Incoming`] (rust-lang/rust#97300) - [`impl<T: AsRawFd> AsRawFd for {Arc,Box}<T>`] (rust-lang/rust#97437) - [`ptr::copy` and `ptr::swap` are doing untyped copies] (rust-lang/rust#97712) - [Add cgroupv1 support to `available_parallelism`] (rust-lang/rust#97925) - [Mitigate many incorrect uses of `mem::uninitialized`] (rust-lang/rust#99182) Stabilized APIs --------------- - [`future::IntoFuture`] (https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html) - [`future::poll_fn`] (https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html) - [`task::ready!`] (https://doc.rust-lang.org/stable/std/task/macro.ready.html) - [`num::NonZero*::checked_mul`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul) - [`num::NonZero*::checked_pow`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow) - [`num::NonZero*::saturating_mul`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul) - [`num::NonZero*::saturating_pow`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_pow) - [`num::NonZeroI*::abs`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.abs) - [`num::NonZeroI*::checked_abs`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.checked_abs) - [`num::NonZeroI*::overflowing_abs`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.overflowing_abs) - [`num::NonZeroI*::saturating_abs`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.saturating_abs) - [`num::NonZeroI*::unsigned_abs`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.unsigned_abs) - [`num::NonZeroI*::wrapping_abs`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.wrapping_abs) - [`num::NonZeroU*::checked_add`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_add) - [`num::NonZeroU*::checked_next_power_of_two`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_next_power_of_two) - [`num::NonZeroU*::saturating_add`] (https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_add) - [`os::unix::process::CommandExt::process_group`] (https://doc.rust-lang.org/stable/std/os/unix/process/trait.CommandExt.html#tymethod.process_group) - [`os::windows::fs::FileTypeExt::is_symlink_dir`] (https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir) - [`os::windows::fs::FileTypeExt::is_symlink_file`] (https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file) These types were previously stable in `std::ffi`, but are now also available in `core` and `alloc`: - [`core::ffi::CStr`] (https://doc.rust-lang.org/stable/core/ffi/struct.CStr.html) - [`core::ffi::FromBytesWithNulError`] (https://doc.rust-lang.org/stable/core/ffi/struct.FromBytesWithNulError.html) - [`alloc::ffi::CString`] (https://doc.rust-lang.org/stable/alloc/ffi/struct.CString.html) - [`alloc::ffi::FromVecWithNulError`] (https://doc.rust-lang.org/stable/alloc/ffi/struct.FromVecWithNulError.html) - [`alloc::ffi::IntoStringError`] (https://doc.rust-lang.org/stable/alloc/ffi/struct.IntoStringError.html) - [`alloc::ffi::NulError`] (https://doc.rust-lang.org/stable/alloc/ffi/struct.NulError.html) These types were previously stable in `std::os::raw`, but are now also available in `core::ffi` and `std::ffi`: - [`ffi::c_char`] (https://doc.rust-lang.org/stable/std/ffi/type.c_char.html) - [`ffi::c_double`] (https://doc.rust-lang.org/stable/std/ffi/type.c_double.html) - [`ffi::c_float`] (https://doc.rust-lang.org/stable/std/ffi/type.c_float.html) - [`ffi::c_int`] (https://doc.rust-lang.org/stable/std/ffi/type.c_int.html) - [`ffi::c_long`] (https://doc.rust-lang.org/stable/std/ffi/type.c_long.html) - [`ffi::c_longlong`] (https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html) - [`ffi::c_schar`] (https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html) - [`ffi::c_short`] (https://doc.rust-lang.org/stable/std/ffi/type.c_short.html) - [`ffi::c_uchar`] (https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html) - [`ffi::c_uint`] (https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html) - [`ffi::c_ulong`] (https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html) - [`ffi::c_ulonglong`] (https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html) - [`ffi::c_ushort`] (https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html) These APIs are now usable in const contexts: - [`slice::from_raw_parts`] (https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html) Cargo ----- - [Packages can now inherit settings from the workspace so that the settings can be centralized in one place.] (rust-lang/cargo#10859) See [`workspace.package`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacepackage-table) and [`workspace.dependencies`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacedependencies-table) for more details on how to define these common settings. - [Cargo commands can now accept multiple `--target` flags to build for multiple targets at once] (rust-lang/cargo#10766), and the [`build.target`](https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildtarget) config option may now take an array of multiple targets. - [The `--jobs` argument can now take a negative number to count backwards from the max CPUs.] (rust-lang/cargo#10844) - [`cargo add` will now update `Cargo.lock`.] (rust-lang/cargo#10902) - [Added](rust-lang/cargo#10838) the [`--crate-type`](https://doc.rust-lang.org/nightly/cargo/commands/cargo-rustc.html#option-cargo-rustc---crate-type) flag to `cargo rustc` to override the crate type. - [Significantly improved the performance fetching git dependencies from GitHub when using a hash in the `rev` field.] (rust-lang/cargo#10079) Misc ---- - [The `rust-analyzer` rustup component is now available on the stable channel.] (rust-lang/rust#98640) Compatibility Notes ------------------- - The minimum required versions for all `-linux-gnu` targets are now at least kernel 3.2 and glibc 2.17, for targets that previously supported older versions: [Increase the minimum linux-gnu versions](rust-lang/rust#95026) - [Network primitives are now implemented with the ideal Rust layout, not the C system layout] (rust-lang/rust#78802). This can cause problems when transmuting the types. - [Add assertion that `transmute_copy`'s `U` is not larger than `T`] (rust-lang/rust#98839) - [A soundness bug in `BTreeMap` was fixed] (rust-lang/rust#99413) that allowed data it was borrowing to be dropped before the container. - [The Drop behavior of C-like enums cast to ints has changed] (rust-lang/rust#96862). These are already discouraged by a compiler warning. - [Relate late-bound closure lifetimes to parent fn in NLL] (rust-lang/rust#98835) - [Errors at const-eval time are now in future incompatibility reports] (rust-lang/rust#97743) - On the `thumbv6m-none-eabi` target, some incorrect `asm!` statements were erroneously accepted if they used the high registers (r8 to r14) as an input/output operand. [This is no longer accepted] (rust-lang/rust#99155). - [`impl Trait` was accidentally accepted as the associated type value of return-position `impl Trait`] (rust-lang/rust#97346), without fulfilling all the trait bounds of that associated type, as long as the hidden type satisfies said bounds. This has been fixed. Internal Changes ---------------- These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - Windows builds now use profile-guided optimization, providing 10-20% improvements to compiler performance: [Utilize PGO for windows x64 rustc dist builds] (rust-lang/rust#96978) - [Stop keeping metadata in memory before writing it to disk] (rust-lang/rust#96544) - [compiletest: strip debuginfo by default for mode=ui] (rust-lang/rust#98140) - Many improvements to generated code for derives, including performance improvements: - [Don't use match-destructuring for derived ops on structs.] (rust-lang/rust#98446) - [Many small deriving cleanups] (rust-lang/rust#98741) - [More derive output improvements] (rust-lang/rust#98758) - [Clarify deriving code](rust-lang/rust#98915) - [Final derive output improvements] (rust-lang/rust#99046) - [Stop injecting `#[allow(unused_qualifications)]` in generated `derive` implementations](rust-lang/rust#99485) - [Improve `derive(Debug)`](rust-lang/rust#98190) - [Bump to clap 3](rust-lang/rust#98213) - [fully move dropck to mir](rust-lang/rust#98641) - [Optimize `Vec::insert` for the case where `index == len`.] (rust-lang/rust#98755) - [Convert rust-analyzer to an in-tree tool] (rust-lang/rust#99603)
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We currently don't allow the failure memory ordering of compare-exchange operations to be stronger than the success ordering, as was the case in C++11 when its memory model was copied to Rust. However, this restriction was lifted in C++17 as part of p0418r2. It's time we lift the restriction too.
Fixes #68464