It uses the file metadata on Unix with a fallback for files incorrectly
reported as zero-sized. It uses `GetFileSizeEx` on Windows.
This reduces the number of syscalls needed for determining the file size
of an open file from 3 to 1.
make `OsString::new` and `PathBuf::new` unstably const
Since #129041, `String::into_bytes` is `const`, which allows making `OsString::new` and `PathBuf::new` unstably const now.
Not sure what the exact process for this is; does it need an ACP?
Remove bootstrap cfgs from library/
These `cfg(bootstrap)` are always false now that rust-lang/rust#119899 has landed, and likewise `cfg(not(bootstrap))` is always true. Therefore, we don't need to wait for the usual stage0 bump to clean these up.
std: abort the process on failure to allocate a TLS key
The panic machinery uses TLS, so panicking if no TLS keys are left can lead to infinite recursion (see https://github.com/rust-lang/rust/issues/140798#issuecomment-2872307377). Rather than having separate logic for the panic count and the thread name, just always abort the process if a TLS key allocation fails. This also has the benefit of aligning the key-based TLS implementation with the documentation, which does not mention that a panic could also occur because of resource exhaustion.
Clarify &mut-methods' docs on sync::OnceLock
Three small changes to the docs of `sync::OnceLock`:
* The docs for `OnceLock::take()` used to [say](https://doc.rust-lang.org/std/sync/struct.OnceLock.html#method.take) "**Safety** is guaranteed by requiring a mutable reference." (emphasis mine). While technically correct, imho its not necessary to even mention safety - as opposed to unsafety - here: Safety never comes up wrt `OnceLock`, as there is (currently) no way to interact with a `OnceLock` in an unsafe way; there are no unsafe methods on `OnceLock`, so there is "safety" guarantee required anywhere. What we simply meant to say is "**Synchronization** is guaranteed...".
* I've add that phrase to the other methods of `OnceLock` which take a `&mut self`, to highlight the fact that having a `&mut OnceLock` guarantees that synchronization with other threads is not required. This is the same as with [`Mutex::get_mut()`](https://doc.rust-lang.org/std/sync/struct.Mutex.html#method.get_mut), [`Cell::get_mut()`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut), and others.
* In that spirit, the half-sentence "or being initialized" was removed from `get_mut()`, as there is no way that the `OnceLock` is being initialized while we are holding `&mut` to it. Probably a copy&paste from `.get()`
In the previous description it said there was a TOCTOU race but did not
explain exactly what the problem was. I sat down with the CVE, reviewed
its text, and created this explanation. This context should hopefully
help people understand the actual risk as-such.
Incidentally, it also fixes the capitalization on the name of Redox OS.
Add const support for the float rounding methods floor, ceil, trunc,
fract, round and round_ties_even.
This works by moving the calculation logic from
src/tools/miri/src/intrinsics/mod.rs
into
compiler/rustc_const_eval/src/interpret/intrinsics.rs.
All relevant method definitions were adjusted to include the `const`
keyword for all supported float types: f16, f32, f64 and f128.
The constness is hidden behind the feature gate
feature(const_float_round_methods)
which is tracked in
https://github.com/rust-lang/rust/issues/141555
This commit is a squash of the following commits:
- test: add tests that we expect to pass when float rounding becomes const
- feat: make float rounding methods `const`
- fix: replace `rustc_allow_const_fn_unstable(core_intrinsics)` attribute with `#[rustc_const_unstable(feature = "f128", issue = "116909")]` in `library/core/src/num/f128.rs`
- revert: undo update to `library/stdarch`
- refactor: replace multiple `float_<mode>_intrinsic` rounding methods with a single, parametrized one
- fix: add `#[cfg(not(bootstrap))]` to new const method tests
- test: add extra sign tests to check `+0.0` and `-0.0`
- revert: undo accidental changes to `round` docs
- fix: gate `const` float round method behind `const_float_round_methods`
- fix: remove unnecessary `#![feature(const_float_methods)]`
- fix: remove unnecessary `#![feature(const_float_methods)]` [2]
- revert: undo changes to `tests/ui/consts/const-eval/float_methods.rs`
- fix: adjust after rebase
- test: fix float tests
- test: add tests for `fract`
- chore: add commented-out `const_float_round_methods` feature gates to `f16` and `f128`
- fix: adjust NaN when rounding floats
- chore: add FIXME comment for de-duplicating float tests
- test: remove unnecessary test file `tests/ui/consts/const-eval/float_methods.rs`
- test: fix tests after upstream simplification of how float tests are run
Rollup of 8 pull requests
Successful merges:
- rust-lang/rust#140787 (Note expr being cast when encounter NonScalar cast error)
- rust-lang/rust#141112 (std: note that `std::str::from_utf8*` functions are aliases to `<str>::from_utf8*` methods)
- rust-lang/rust#141646 (Document what `distcheck` is intended to exercise)
- rust-lang/rust#141740 (Hir item kind field order)
- rust-lang/rust#141793 (`tests/ui`: A New Order [1/N])
- rust-lang/rust#141805 (Update `compiler-builtins` to 0.1.160)
- rust-lang/rust#141815 (Enable non-leaf Frame Pointers for mingw-w64 Arm64 Windows)
- rust-lang/rust#141819 (Fixes for building windows-gnullvm hosts)
r? `@ghost`
`@rustbot` modify labels: rollup
Do not move thread-locals before dropping
Fixesrust-lang/rust#140816. I also (potentially) improved the speed of `get_or_init` a bit by having an explicit hot/cold path.
We still move the value before dropping in the event of a recursive initialization (leading to double-initialization with one value being silently dropped). This is the old behavior, but changing this to panic instead would involve changing tests and also the other OS-specific `thread_local/os.rs` implementation, which is more than I'd like in this PR.
The float modules in `std` are currently top-level but for `core`, they
are nested within the `num` directory and referenced by `#[path = ...]`.
For consistency, adjust `std` to use the same structure as `core`.
Also change the `f16` and `f128` gates from outer attributes to inner
attributes like `core` has.
Add `rustc_diagnostic_item` to `sys::Mutex` methods
For an ongoing project for adding a concurrency model checker to Miri we need to be able to intercept locking/unlocking operations on standard library mutexes.
This PR adds diagnostic items to the relevant calls `lock`, `try_lock` and `unlock` for the `sys::Mutex` implementation on the targets we care about.
This PR also makes the internals of `pthread::Mutex` less public, to reduce the chance of anyone locking/unlocking a mutex without going through the intercepted methods.
r? ``@RalfJung``
Path::with_extension: show that it adds an extension where one did no…
…t exist
I think the times I encountered this, I had to check first if files without extensions were added, since all examples only had files with existing extensions.
Also, this replaced example already has a similar example below.
Test(fs): Fix `test_eq_windows_file_type` for Windows 7
Would otherwise fail on:
```
thread 'fs::tests::test_eq_windows_file_type' panicked at library/std/src/test_helpers.rs:53:20:
called `Result::unwrap()` on an `Err` value: Os { code: 5, kind: PermissionDenied, message: "Access is denied." }
```
This came from the read-only attribute set on the test file. In order to fix this, instead of simply disabling the test, the attribute is reset before the test's end so it may still run successfully.
`@rustbot` label T-libs A-filesystem A-testsuite O-windows-7 O-windows-msvc
Split `autodiff` into `autodiff_forward` and `autodiff_reverse`
This PR splits `#[autodiff]` macro so `#[autodiff(df, Reverse, args)]` would become `#[autodiff_reverse(df, args)]` and `#[autodiff(df, Forward, args)]` would become `#[autodiff_forwad(df, args)]`.
Add data_ptr method to Mutex and RwLock
Implementation of https://github.com/rust-lang/rust/issues/140368 / https://github.com/rust-lang/libs-team/issues/531.
I tried to write a useful safety section about when it is safe to read or write through the returned pointers, but couldn't come up with something nice. Hoping this PR is still useful without that. I'm happy to add any doc strings other people come up with if needed before merge, of course.
Unresolved questions:
- Return a `LockResult` or not?
- Return `*mut T` like existing APIs (`Cell::as_ptr` / `MaybeUninit::as[_mut]_ptr` / `Vec::as_ptr` / ...) or be more precise and return `NonNull<T>`?
Would otherwise fail on:
```
thread 'fs::tests::test_eq_windows_file_type' panicked at library/std/src/test_helpers.rs:53:20:
called `Result::unwrap()` on an `Err` value: Os { code: 5, kind: PermissionDenied, message: "Access is denied." }
```
This came from the read-only attribute set on the test file. In order to
fix this, instead of simply disabling the test, the attribute is reset
before the test's end so it may still run successfully.
Signed-off-by: Paul Mabileau <paul.mabileau@harfanglab.fr>
Clarify WTF-8 safety docs
This PR is a follow-up to PR #140159, which clarifies ~~two things~~:
- the WTF-8 safety comment [was confusing](https://github.com/rust-lang/rust/pull/140159#discussion_r2082766965), either surrogate condition is actually sufficient for safety, both are not required
- ~~the private `os_str::Slice` type name is easily confused with `std::slice`~~
~~Happy to bikeshed the `OsSlice` name, other alternatives are `OsStrSlice` and `StrSlice`. Now it's got a distinct name from `std::slice`, it's easy to search and replace.~~
cc ``@thaliaarchi`` ``@workingjubilee``
Implement `normalize_lexically`
Implements #134694
This is, I think, the most straightforward implementation I could do, which will hopefully more easily allow experimentation if we decide to change the design here.
Docs(lib): Fix `extract_if` docs
Various fixes to the documentation comments of the several `extract_if` collection methods available. It originally started with a small typo fix in `Vec`'s spotted when reading the 1.87 release notes, but then by looking at the others' for comparison in order to try determining what was the intended sentence, some inconsistencies were spotted. Therefore, some other changes are also proposed here to reduce these avoidable differences, going more and more nit-picky along the way. See the individual commits for more details about each change.
`@rustbot` label T-libs A-collections A-docs
rename internal panicking::try to catch_unwind
The public function is called `catch_unwind`, the intrinsic at some point got renamed to `catch_unwind` -- there's no reason to have the internal implementation of this still be called `try`, so let's rename it to match the rest.
additional edge cases tests for `path.rs` 🧪
This pull request adds a few new edge case tests to the `std::path` module. The new tests cover scenarios such as paths with only separators, non-ASCII and Unicode characters, embedded new lines, etc. Each new test is documented with some helpful in-line comments as well.
Tobias Bucher