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PR 130999 added the file_lock feature, but doesn't included OpenBSD in the supported targets (Tier 3 platform), leading to a compilation error ("try_lock() not supported").
(cherry picked from commit 8792010768cff60d202b3608e6918be3199aeae2)
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`compiler-builtins` is already in the crate graph via `alloc`, and all
features related to `compiler-builtins` goes through `alloc`. There
isn't any reason that `std` needs this direct dependency, so remove it.
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`compiler_builtins` shouldn't be called directly. Change the `PartialEq`
implementation for `DevicePathNode` to use slice equality instead, which
will call `memcmp`/`bcmp` via the intrinsic.
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thread name in stack overflow message
Fixes rust-lang/rust#144481, which is caused by the thread name not being initialised yet when setting up the stack overflow information. Unfortunately, the stack overflow UI test did not test for the correct thread name being present, and testing this separately didn't occur to me when writing https://github.com/rust-lang/rust/pull/140628.
This PR contains the smallest possible fix I could think of: passing the thread name explicitly to the platform thread creation function. In the future I'd very much like to explore some possibilities around merging the thread packet and thread handle into one structure and using that in the platform code instead – but that's best left for another PR.
This PR also amends the stack overflow test to check for thread names, so we don't run into this again.
``@rustbot`` label +beta-nominated
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Implementation: `#[feature(sync_nonpoison)]`, `#[feature(nonpoison_mutex)]`
Continuation of https://github.com/rust-lang/rust/pull/134663
Tracking Issue: https://github.com/rust-lang/rust/issues/134645
This PR implements a new `sync/nonpoison` module, as well as the `nonpoison` variant of the `Mutex` lock.
There are 2 main changes here, the first is the new `nonpoison::mutex` module, and the second is the `mutex` integration tests.
For the `nonpoison::mutex` module, I did my best to align it with the current state of the `poison::mutex` module. This means that several unstable features (`mapped_lock_guards`, `lock_value_accessors`, and `mutex_data_ptr`) are also in the new `nonpoison::mutex` module, under their respective feature gates. Everything else in that file is under the correct feature gate (`#[unstable(feature = "nonpoison_mutex", issue = "134645")]`).
Everything in the `nonpoison::mutex` file is essentially identical in spirit, as we are simply removing the error case from the original `poison::mutex`.
The second big change is in the integration tests. I created a macro called that allows us to duplicate tests that are "generic" over the different mutex types, in that the poison mutex is always `unwrap`ped.
~~I think that there is an argument against doing this, as it can make the tests a bit harder to understand (and language server capabilities are weaker within macros), but I think the benefit of code deduplication here is worth it. Note that it is definitely possible to generalize this (with a few tweaks) to testing the other `nonpoison` locks when they eventually get implemented, but I'll leave that for a later discussion.~~
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Adds tests for the `nonpoison::Mutex` variant by using a macro to
duplicate the existing `poison` tests.
Note that all of the tests here are adapted from the existing `poison`
tests.
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This commit simply helps discern the actual changes needed to test both
poison and nonpoison locks.
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Adds the equivalent `nonpoison` types to the `poison::mutex` module.
These types and implementations are gated under the `nonpoison_mutex`
feature gate.
Also blesses the ui tests that now have a name conflicts (because these
types no longer have unique names). The full path distinguishes the
different types.
Co-authored-by: Aandreba <aandreba@gmail.com>
Co-authored-by: Trevor Gross <tmgross@umich.edu>
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Add `core::mem::DropGuard`
## 1.0 Summary
This PR introduces a new type `core::mem::DropGuard` which wraps a value and runs a closure when the value is dropped.
```rust
use core::mem::DropGuard;
// Create a new guard around a string that will
// print its value when dropped.
let s = String::from("Chashu likes tuna");
let mut s = DropGuard::new(s, |s| println!("{s}"));
// Modify the string contained in the guard.
s.push_str("!!!");
// The guard will be dropped here, printing:
// "Chashu likes tuna!!!"
```
## 2.0 Motivation
A number of programming languages include constructs like `try..finally` or `defer` to run code as the last piece of a particular sequence, regardless of whether an error occurred. This is typically used to clean up resources, like closing files, freeing memory, or unlocking resources. In Rust we use the `Drop` trait instead, allowing us to [never having to manually close sockets](https://blog.skylight.io/rust-means-never-having-to-close-a-socket/).
While `Drop` (and RAII in general) has been working incredibly well for Rust in general, sometimes it can be a little verbose to setup. In particular when upholding invariants are local to functions, having a quick inline way to setup an `impl Drop` can be incredibly convenient. We can see this in use in the Rust stdlib, which has a number of private `DropGuard` impls used internally:
- [library/alloc/src/vec/drain.rs](https://github.com/rust-lang/rust/blob/9982d6462bedf1e793f7b2dbd655a4e57cdf67d4/library/alloc/src/vec/drain.rs#L177)
- [library/alloc/src/boxed/thin.rs](https://github.com/rust-lang/rust/blob/9982d6462bedf1e793f7b2dbd655a4e57cdf67d4/library/alloc/src/boxed/thin.rs#L362)
- [library/alloc/src/slice.rs](https://github.com/rust-lang/rust/blob/9982d6462bedf1e793f7b2dbd655a4e57cdf67d4/library/alloc/src/slice.rs#L413)
- [library/alloc/src/collections/linked_list.rs](https://github.com/rust-lang/rust/blob/9982d6462bedf1e793f7b2dbd655a4e57cdf67d4/library/alloc/src/collections/linked_list.rs#L1135)
- [library/alloc/src/collections/binary_heap/mod.rs](https://github.com/rust-lang/rust/blob/9982d6462bedf1e793f7b2dbd655a4e57cdf67d4/library/alloc/src/collections/binary_heap/mod.rs#L1816)
- [library/alloc/src/collections/btree/map.rs](https://github.com/rust-lang/rust/blob/9982d6462bedf1e793f7b2dbd655a4e57cdf67d4/library/alloc/src/collections/btree/map.rs#L1715)
- [library/alloc/src/collections/vec_deque/drain.rs](https://github.com/rust-lang/rust/blob/9982d6462bedf1e793f7b2dbd655a4e57cdf67d4/library/alloc/src/collections/vec_deque/drain.rs#L95)
- [library/alloc/src/vec/into_iter.rs](https://github.com/rust-lang/rust/blob/9982d6462bedf1e793f7b2dbd655a4e57cdf67d4/library/alloc/src/vec/into_iter.rs#L488)
- [library/std/src/os/windows/process.rs](https://github.com/rust-lang/rust/blob/9982d6462bedf1e793f7b2dbd655a4e57cdf67d4/library/std/src/os/windows/process.rs#L320)
- [tests/ui/process/win-proc-thread-attributes.rs](https://github.com/rust-lang/rust/blob/9982d6462bedf1e793f7b2dbd655a4e57cdf67d4/tests/ui/process/win-proc-thread-attributes.rs#L17)
## 3.0 Design
This PR implements what can be considered about the simplest possible design:
1. A single type `DropGuard` which takes both a generic type `T` and a closure `F`.
2. `Deref` + `DerefMut` impls to make it easy to work with the `T` in the guard.
3. An `impl Drop` on the guard which calls the closure `F` on drop.
4. An inherent `fn into_inner` which takes the type `T` out of the guard without calling the closure `F`.
Notably this design does not allow divergent behavior based on the type of drop that has occurred. The [`scopeguard` crate](https://docs.rs/scopeguard/latest/scopeguard/index.html) includes additional `on_success` and `on_onwind` variants which can be used to branch on unwind behavior instead. However [in a lot of cases](https://github.com/rust-lang/rust/issues/143612#issuecomment-3053928328) this doesn’t seem necessary, and using the arm/disarm pattern seems to provide much the same functionality:
```rust
let guard = DropGuard::new((), |s| ...); // 1. Arm the guard
other_function(); // 2. Perform operations
guard.into_inner(); // 3. Disarm the guard
```
`DropGuard` combined with this pattern seems like it should cover the vast majority of use cases for quick, inline destructors. It certainly seems like it should cover all existing uses in the stdlib, as well as all existing uses in crates like [hashbrown](https://github.com/search?q=repo%3Arust-lang%2Fhashbrown%20guard&type=code).
## 4.0 Acknowledgements
This implementation is based on the [mini-scopeguard crate](https://github.com/yoshuawuyts/mini-scopeguard) which in turn is based on the [scopeguard crate](https://docs.rs/scopeguard). The implementations only differ superficially; because of the nature of the problem there is only really one obvious way to structure the solution. And the scopeguard crate got that right!
## 5.0 Conclusion
This PR adds a new type `core::mem::DropGuard` to the stdlib which adds a small convenience helper to create inline destructors with. This would bring the majority of the functionality of the `scopeguard` crate into the stdlib, which is the [49th most downloaded crate](https://crates.io/crates?sort=downloads) on crates.io (387 million downloads).
Given the actual implementation of `DropGuard` is only around 60 lines, it seems to hit that sweet spot of low-complexity / high-impact that makes for a particularly efficient stdlib addition. Which is why I’m putting this forward for consideration; thanks!
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Fix CI for drop_guard
fix CI
fix all tidy lints
fix tidy link
add first batch of feedback from review
Add second batch of feedback from review
add third batch of feedback from review
fix failing test
Update library/core/src/mem/drop_guard.rs
Co-authored-by: Ruby Lazuli <general@patchmixolydic.com>
fix doctests
Implement changes from T-Libs-API review
And start tracking based on the tracking issue.
fix tidy lint
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Remove `compiler-builtins-{no-asm,mangled-names}`
Remove `compiler-builtins-no-asm`
This feature used to be for when Cranelift didn't support inline
assembly, but its last uses were removed in 52933e0bd200 ("Don't disable
inline asm usage in compiler-builtins when the cranelift backend is
enabled"). and cba05a7a14b3 ("Support naked functions").
This doesn't remove the feature from the `compiler-builtins` crate, that
will be done separately in the subtree repo.
---
Remove `compiler-builtins-mangled-names`
This config was added in 207de019dc67 ("libary: Forward
compiler-builtins "asm" and "mangled-names" feature") but it does not
appear this has ever been used. The PR adding it (rust-lang/rust#78472) says that
this was exposed to help with configuration and points at the [Hermit
Cargo config], but as far as I can tell, this feature name has never
been mentioned in that repository's git history.
Thus, clean up a seemingly unneeded feature.
[Hermit Cargo config]: https://github.com/hermit-os/hermit-rs/blob/ab2b830930e6a9a98c8294997a8183feeabeda4a/.cargo/config
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If `HOME` is empty, use the fallback instead
This is a minor change in the `home_dir` api. An empty path is never (or should never be) valid so if the `HOME` environment variable is empty then let's use the fallback instead.
r? libs-api
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Rollup of 9 pull requests
Successful merges:
- rust-lang/rust#140871 (Don't lint against named labels in `naked_asm!`)
- rust-lang/rust#141663 (rustdoc: add ways of collapsing all impl blocks)
- rust-lang/rust#143272 (Upgrade the `fortanix-sgx-abi` dependency)
- rust-lang/rust#143585 (`loop_match`: suggest extracting to a `const` item)
- rust-lang/rust#143698 (Fix unused_parens false positive)
- rust-lang/rust#143859 (Guarantee 8 bytes of alignment in Thread::into_raw)
- rust-lang/rust#144160 (tests: debuginfo: Work around or disable broken tests on powerpc)
- rust-lang/rust#144412 (Small cleanup: Use LocalKey<Cell> methods more)
- rust-lang/rust#144431 (Disable has_reliable_f128_math on musl targets)
r? `@ghost`
`@rustbot` modify labels: rollup
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Guarantee 8 bytes of alignment in Thread::into_raw
When using `AtomicPtr` for synchronization it's incredibly useful when you've got a couple bits you can stuff metadata in. By guaranteeing that `Thread`'s `Inner` struct is aligned to 8 bytes everyone can use the bottom 3 bits to signal other things, such as a critical section, etc.
This guarantee is thus very useful and costs us nothing.
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Upgrade the `fortanix-sgx-abi` dependency
0.6.1 removes the `compiler-builtins` dependency, part of RUST-142265. The breaking change from 0.5 to 0.6 is for an update to the `insecure_time` API [1].
I validated that `./x c library --target x86_64-fortanix-unknown-sgx` completes successfully with this change.
Link: https://github.com/fortanix/rust-sgx/commit/a34e9767f37d6585c18bdbd31cddcadc56670d57 [1]
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Update `dlmalloc` dependency of libstd
This primarily pulls in alexcrichton/dlmalloc-rs#55 and alexcrichton/dlmalloc-rs#54 to address rust-lang/rust#144199. Notably the highest byte in the wasm address space is no longer allocatable and additionally the allocator internally uses `wrapping_add` instead of `add` on pointers since on 32-bit platforms offsets might be larger than half the address space.
Closes rust-lang/rust#144199
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This config was added in 207de019dc67 ("libary: Forward
compiler-builtins "asm" and "mangled-names" feature") but it does not
appear this has ever been used. The PR adding it (RUST-78472) says that
this was exposed to help with configuration and points at the [Hermit
Cargo config], but as far as I can tell, this feature name has never
been mentioned in that repository's git history.
Thus, clean up a seemingly unneeded feature.
[Hermit Cargo config]: https://github.com/hermit-os/hermit-rs/blob/ab2b830930e6a9a98c8294997a8183feeabeda4a/.cargo/config
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This feature used to be for when Cranelift didn't support inline
assembly, but its last uses were removed in 52933e0bd200 ("Don't disable
inline asm usage in compiler-builtins when the cranelift backend is
enabled"). and cba05a7a14b3 ("Support naked functions").
This doesn't remove the feature from the `compiler-builtins` crate, that
will be done separately in the subtree repo.
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std: net: uefi: Add support to query connection data
- Use EFI_TCP4_GET_MODE_DATA to be able to query for ttl, nodelay, peer_addr and socket_addr.
- peer_addr is needed for implementation of `accept`.
- cc `````@nicholasbishop`````
- Also a heads up. The UEFI spec seems to be wrong or something for [EFI_TCP4_CONFIG_DATA](https://uefi.org/specs/UEFI/2.11/28_Network_Protocols_TCP_IP_and_Configuration.html#efi-tcp4-protocol-getmodedata). `ControlOption` should be a pointer as seen in [edk2](https://github.com/tianocore/edk2/blob/a1b509c1a453815acbc6c8b0fc5882fd03a6f2c0/MdePkg/Include/Protocol/Tcp4.h#L97).
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This primarily pulls in alexcrichton/dlmalloc-rs/55 and
alexcrichton/dlmalloc-rs/54 to address 144199. Notably the highest byte
in the wasm address space is no longer allocatable and additionally the
allocator internally uses `wrapping_add` instead of `add` on pointers
since on 32-bit platforms offsets might be larger than half the address
space.
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Fix broken TLS destructors on 32-bit win7
Fixes rust-lang/rust#141300
On the 32-bit win7 target, we use OS TLS instead of native TLS, due to issues with how the OS handles alignment. Unfortunately, this caused issues due to the TLS destructors not running, causing memory leaks among other problems.
On Windows, to support OS TLS, the TlsAlloc family of function is used by Rust. This function does not support TLS destructors at all. However, rust has some code to emulate those destructors, by leveraging the TLS support functionality found in the MSVC CRT (specifically, in tlssup.c of the CRT).
To use this functionality, the user must do two things:
1. They must put the address to their callback in a section between `.CRT$XLB` and `.CRT$XLY`.
2. They must add a reference to `_tls_used` (or `__tls_used` on x86) to make sure the TLS support code in tlssup.c isn't garbage collected by the linker.
Prior to this commit, this second bit wasn't being done properly by the Rust TLS support code. Instead of adding a reference to _tls_used, it instead had a reference to its own callback to prevent it from getting GC'd by the linker. While this is _also_ necessary, not having a reference on _tls_used made the entire support non-functional.
This commit reworks the code to:
1. Add an unconditional `#[used]` attribute on the CALLBACK, which should be enough to prevent it from getting GC'd by the linker.
2. Add a reference to `_tls_used`, which should pull the TLS support code into the Rust programs and not let it be GC'd by the linker.
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- Use EFI_TCP4_GET_MODE_DATA to be able to query for ttl, nodelay,
peer_addr and socket_addr.
- peer_addr is needed for implementation of `accept`.
Signed-off-by: Ayush Singh <ayush@beagleboard.org>
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On the 32-bit win7 target, we use OS TLS instead of native TLS, due to
issues with how the OS handles alignment. Unfortunately, this caused
issues due to the TLS destructors not running, causing memory leaks
among other problems.
On Windows, to support OS TLS, the TlsAlloc family of function is used
by Rust. This function does not support TLS destructors at all. However,
rust has some code to emulate those destructors, by leveraging the TLS
support functionality found in the MSVC CRT (specifically, in tlssup.c
of the CRT). Specifically, the CRT provides the ability to register
callbacks that are called (among other things) on thread destruction. By
registering our own callback, we can run through a list of registered
destructors functions to execute.
To use this functionality, the user must do two things:
1. They must put the address to their callback in a section between
`.CRT$XLB` and `.CRT$XLY`.
2. They must add a reference to `_tls_used` (or `__tls_used` on x86) to
make sure the TLS support code in tlssup.c isn't garbage collected by
the linker.
Prior to this commit, this second bit wasn't being done properly by the
Rust TLS support code. Instead of adding a reference to _tls_used, it
instead had a reference to its own callback to prevent it from getting
GC'd by the linker. While this is _also_ necessary, not having a
reference on _tls_used made the entire support non-functional.
This commit reworks the code to:
1. Add an unconditional `#[used]` attribute on the CALLBACK, which
should be enough to prevent it from getting GC'd by the linker.
2. Add a reference to `_tls_used`, which should pull the TLS support
code into the Rust programs and not let it be GC'd by the linker.
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Make slice comparisons const
This needed a fix for `derive_const`, too, as it wasn't usable in libcore anymore as trait impls need const stability attributes. I think we can't use the same system as normal trait impls while `const_trait_impl` is still unstable.
r? ```@fee1-dead```
cc rust-lang/rust#143800
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Also make it *only* usable on nightly
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Update poison.rs
Typo in word "below" previously "bellow"
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Linting public reexport of private dependencies
Part of public/private dependencies rust-lang/rust#44663
Partially addresses rust-lang/rust#71043
I'm adding a warning for reexports of private dependencies into `rustc_resolve`. I get that this should not be a warning, but should instead be a lint to be controlled by the feature gate, but I did not figure out how exactly to do that at that point. I tried doing the same thing as is done in `rustc_privacy`, but the linting system is not ready yet as far as I understand the error I got, so I made a warning for now instead. Some guidance on how to emit lints with `dcx` would be appreciated.
This also sets the `std_detect` crate as a public dependency of `std` because some macros are reexported from there. I did not check closer, but the other option may be to allow the specific reexports instead.
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Trim `BorrowedCursor` API
This PR removes some method from the unstable `BorrowedCursor` type. A rational for each change can be found in the message of each commit.
I don't think that an ACP is required for this, please tell me if it is not the case.
Cc rust-lang/rust#78485 rust-lang/rust#117693
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UWP: link ntdll functions using raw-dylib
Lazy loading isn't necessary so there's no need for the added complexity and overhead. However, it may be that people using UWP rust libraries don't have the necessary import libraries linked by Visual Studio so this uses raw-dylib, which allows linking to DLL functions without having an import library. This is a somewhat temporary situation as raw-dylib is intended to eventually be the default for all imports. When that happens, this special case can be removed.
Closes rust-lang/rust#143530
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Typo in word "below"
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Add experimental `backtrace-trace-only` std feature
This experimentally allows building std with backtrace but without symbolisation. It does not affect stable and requires build-std to use. This doesn't change the backtrace crate itself so relies on the optimizer to remove the unused parts.
Example usage:
```toml
# .cargo/config.toml
[unstable]
build-std = ["core", "alloc", "panic_unwind", "std"]
build-std-features = ["backtrace", "backtrace-trace-only", "panic-unwind"]
```
```toml
# Cargo.toml
[profile.release]
opt-level = 3
lto = "thin"
codegen-units = 1
```
Ideally we should split the backtrace feature into `backtrace-trace` and `backtrace-symbolize` (with the latter dependent on the former) because Cargo features tend to work better when they're positive rather than negative. But I'm keen for this experiment not to break existing users.
cc ``@joshtriplett``
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Updates to random number generation APIs
Updates based on discussions about random number generation.
- Add comment on `RandomSource::fill_bytes` about multiple calls, to allow
efficient implementations for random sources that generate a word at a time.
- Drop the `Random` trait in favor of `Distribution<T>`, which will let people
make calls like random(1..=6), and which allows for future expansion to
non-uniform distributions, as well as floating-point. (For now, this is only
implemented for `RangeFull`, to get the interface in place. Subsequent PRs
will implement it for other range types.)
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Don't call WSACleanup on process exit
This isn't necessary as cleanup will happen when the process exits regardless.
fixes rust-lang/rust#141799
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Use zero for initialized Once state
By re-labeling which integer represents which internal state for `Once` we can ensure that the initialized state is the all-zero state. This is beneficial because some CPU architectures (such as Arm) have specialized instructions to specifically branch on non-zero, and checking for the initialized state is by far the most important operation.
As an example, take this:
```rust
use std::sync::atomic::{AtomicU32, Ordering};
const INIT: u32 = 3;
#[inline(never)]
#[cold]
pub fn slow(state: &AtomicU32) {
state.store(INIT, Ordering::Release);
}
pub fn ensure_init(state: &AtomicU32) {
if state.load(Ordering::Acquire) != INIT {
slow(state)
}
}
```
If `INIT` is 3 (as is currently the state for `Once`), we see the following assembly on `aarch64-apple-darwin`:
```asm
example::ensure_init::h332061368366e313:
ldapr w8, [x0]
cmp w8, #3
b.ne LBB1_2
ret
LBB1_2:
b example::slow::ha042bd6a4f33724e
```
By changing the `INIT` state to zero we get the following:
```asm
example::ensure_init::h332061368366e313:
ldapr w8, [x0]
cbnz w8, LBB1_2
ret
LBB1_2:
b example::slow::ha042bd6a4f33724e
```
So this PR saves 1 instruction every time a `LazyLock` gets accessed on platforms such as these.
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std: move NuttX to use arc4random for random number generation
arc4random support in libc merged in https://github.com/rust-lang/libc/pull/4464, so:
* Move `target_os = "nuttx"` from unix_legacy to arc4random section
* This aligns NuttX with other POSIX-compliant systems that support arc4random
* Improves random number generation quality on NuttX by using the system's built-in arc4random implementation instead of legacy fallback methods
NuttX supports arc4random_buf which provides better entropy and security compared to the legacy random number generation methods.
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