Improve accuracy of asinh and acosh
This PR addresses the inaccuracy of `asinh` and `acosh` identified by the [Herbie](http://herbie.uwplse.org/) tool, `@pavpanchekha,` `@finnbear` in #104548. It also adds a couple tests that failed in the existing implementations and now pass.
Closes#104548
r? rust-lang/libs
Fix non-associativity of `Instant` math on `aarch64-apple-darwin` targets
This is a duplicate of #94100 (since the original author is unresponsive), which resolves#91417.
On `aarch64-apple-darwin` targets, the internal resolution of `Instant` is lower than that of `Duration`, so math between them becomes non-associative with small-enough durations.
This PR makes this target use the standard Unix implementation (where `Instant` has 1ns resolution), but with `CLOCK_UPTIME_RAW` so it still returns the same values as `mach_absolute_time`[^1].
(Edit: I need someone to confirm that this still works, I do not have access to an M1 device.)
[^1]: https://www.manpagez.com/man/3/clock_gettime/
There seem to be some scenarios where `cpu.cfs_period_us` can contain `0`
This causes a panic when calling `std:🧵:available_parallelism()` as is done so
from binaries built by `cargo test`, which was how the issue was
discovered. I don't feel like `0` is a good value for `cpu.cfs_period_us`, but I
also don't think applications should panic if this value is seen.
This case is handled by other projects which read this information:
- num_cpus: e437b9d908/src/linux.rs (L207-L210)
- ninja: https://github.com/ninja-build/ninja/pull/2174/files
- dotnet: c4341d45ac/src/coreclr/pal/src/misc/cgroup.cpp (L481-L483)
Before this change, this panic could be seen in environments setup as described
above:
```
$ RUST_BACKTRACE=1 cargo test
Finished test [unoptimized + debuginfo] target(s) in 3.55s
Running unittests src/main.rs (target/debug/deps/x-9a42e145aca2934d)
thread 'main' panicked at 'attempt to divide by zero', library/std/src/sys/unix/thread.rs:546:70
stack backtrace:
0: rust_begin_unwind
1: core::panicking::panic_fmt
2: core::panicking::panic
3: std::sys::unix:🧵:cgroups::quota
4: std::sys::unix:🧵:available_parallelism
5: std:🧵:available_parallelism
6: test::helpers::concurrency::get_concurrency
7: test::console::run_tests_console
8: test::test_main
9: test::test_main_static
10: x::main
at ./src/main.rs:1:1
11: core::ops::function::FnOnce::call_once
at /tmp/rust-1.64-1.64.0-1/library/core/src/ops/function.rs:248:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
error: test failed, to rerun pass '--bin local-rabmq-amqpprox'
```
I've tested this change in an environment which has the bad setup and
rebuilding the test executable against a fixed std library fixes the
panic.
Remove unused symbols and diagnostic items
As the title suggests, this removes unused symbols from `sym::` and `#[rustc_diagnostic_item]` annotations that weren't mentioned anywhere.
Originally I tried to use grep, to find symbols and item names that are never mentioned via `sym::name`, however this produced a lot of false positives (?), for example clippy matching on `Symbol::as_str` or macros "implicitly" adding `sym::`. I ended up fixing all these false positives (?) by hand, but tbh I'm not sure if it was worth it...
Update compiler-builtins
This was originally a part of https://github.com/rust-lang/rust/pull/100316. However, extracting it to a seperate PR should help with any extra testing that might be needed.
Signed-off-by: Ayush Singh <ayushsingh1325@gmail.com>
Move `unix_socket_abstract` feature API to `SocketAddrExt`.
The pre-stabilized API for abstract socket addresses exposes methods on `SocketAddr` that are only enabled for `cfg(any(target_os = "android", target_os = "linux"))`. Per discussion in <https://github.com/rust-lang/rust/issues/85410>, moving these methods to an OS-specific extension trait is required before stabilization can be considered.
This PR makes four changes:
1. The internal module `std::os::net` contains logic for the unstable feature `tcp_quickack` (https://github.com/rust-lang/rust/issues/96256). I moved that code into `linux_ext/tcp.rs` and tried to adjust the module tree so it could accommodate a second unstable feature there.
2. Moves the public API out of `impl SocketAddr`, into `impl SocketAddrExt for SocketAddr` (the headline change).
3. The existing function names and docs for `unix_socket_abstract` refer to addresses as being created from abstract namespaces, but a more accurate description is that they create sockets in *the* abstract namespace. I adjusted the function signatures correspondingly and tried to update the docs to be clearer.
4. I also tweaked `from_abstract_name` so it takes an `AsRef<[u8]>` instead of `&[u8]`, allowing `b""` literals to be passed directly.
Issues:
1. The public module `std::os::linux::net` is marked as part of `tcp_quickack`. I couldn't figure out how to mark a module as being part of two unstable features, so I just left the existing attributes in place. My hope is that this will be fixed as a side-effect of stabilizing either feature.
Rollup of 9 pull requests
Successful merges:
- #103709 (ci: Upgrade dist-x86_64-netbsd to NetBSD 9.0)
- #103744 (Upgrade cc for working is_flag_supported on cross-compiles)
- #104105 (llvm: dwo only emitted when object code emitted)
- #104158 (Return .efi extension for EFI executable)
- #104181 (Add a few known-bug tests)
- #104266 (Regression test for coercion of mut-ref to dyn-star)
- #104300 (Document `Path::parent` behavior around relative paths)
- #104304 (Enable profiler in dist-s390x-linux)
- #104362 (Add `delay_span_bug` to `AttrWrapper::take_for_recovery`)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Document `Path::parent` behavior around relative paths
A relative path with just one component will return `Some("")` as its parent, which wasn't clear to me from the documentation.
The parent of `""` is `None`, which was missing from the documentation as well.
Change the way libunwind is linked for *-windows-gnullvm targets
I have no idea why previous way works for `x86_64-fortanix-unknown-sgx` (assuming it actually works...) but not for `gnullvm`. It fails when linking libtest during Rust build (unless somebody adds `RUSTFLAGS='-Clinkarg=-lunwind'`).
Also fixes exception handling on AArch64.
This was originally a part of https://github.com/rust-lang/rust/pull/100316.
However, extracting it to a seperate PR should help with any extra
testing that might be needed.
Signed-off-by: Ayush Singh <ayushsingh1325@gmail.com>
Merge crossbeam-channel into `std::sync::mpsc`
This PR imports the [`crossbeam-channel`](https://github.com/crossbeam-rs/crossbeam/tree/master/crossbeam-channel#crossbeam-channel) crate into the standard library as a private module, `sync::mpmc`. `sync::mpsc` is now implemented as a thin wrapper around `sync::mpmc`. The primary purpose of this PR is to resolve https://github.com/rust-lang/rust/issues/39364. The public API intentionally remains the same.
The reason https://github.com/rust-lang/rust/issues/39364 has not been fixed in over 5 years is that the current channel is *incredibly* complex. It was written many years ago and has sat mostly untouched since. `crossbeam-channel` has become the most popular alternative on crates.io, amassing over 30 million downloads. While crossbeam's channel is also complex, like all fast concurrent data structures, it avoids some of the major issues with the current implementation around dynamic flavor upgrades. The new implementation decides on the datastructure to be used when the channel is created, and the channel retains that structure until it is dropped.
Replacing `sync::mpsc` with a simpler, less performant implementation has been discussed as an alternative. However, Rust touts itself as enabling *fearless concurrency*, and having the standard library feature a subpar implementation of a core concurrency primitive doesn't feel right. The argument is that slower is better than broken, but this PR shows that we can do better.
As mentioned before, the primary purpose of this PR is to fix https://github.com/rust-lang/rust/issues/39364, and so the public API intentionally remains the same. *After* that problem is fixed, the fact that `sync::mpmc` now exists makes it easier to fix the primary limitation of `mpsc`, the fact that it only supports a single consumer. spmc and mpmc are two other common concurrency patterns, and this change enables a path to deprecating `mpsc` and exposing a general `sync::channel` module that supports multiple consumers. It also implements other useful methods such as `send_timeout`. That said, exposing MPMC and other new functionality is mostly out of scope for this PR, and it would be helpful if discussion stays on topic :)
For what it's worth, the new implementation has also been shown to be more performant in [some basic benchmarks](https://github.com/crossbeam-rs/crossbeam/tree/master/crossbeam-channel/benchmarks#results).
cc `@taiki-e`
r? rust-lang/libs
Add the `#[derive_const]` attribute
Closes#102371. This is a minimal patchset for the attribute to work. There are no restrictions on what traits this attribute applies to.
r? `````@oli-obk`````
Remove lock wrappers in `sys_common`
This moves the lazy allocation to `sys` (SGX and UNIX). While this leads to a bit more verbosity, it will simplify future improvements by making room in `sys_common` for platform-independent implementations.
This also removes the condvar check on SGX as it is not necessary for soundness and will be removed anyway once mutex has been made movable.
For simplicity's sake, `libunwind` also uses lazy allocation now on SGX. This will require an update to the C definitions before merging this (CC `@raoulstrackx).`
r? `@m-ou-se`
A relative path with just one component will return `Some("")` as its
parent, which wasn't clear to me from the documentation.
The parent of `""` is `None`, which was missing from the documentation
as well.
Make `Hash`, `Hasher` and `BuildHasher` `#[const_trait]` and make `Sip` const `Hasher`
This PR enables using Hashes in const context.
r? ``@fee1-dead``
