Following #137165 (Use `tell` for `<File as Seek>::stream_position`),
`tell` is now directly exposed via `stream_position`, making
`<File as FileExt>::tell` redundant. Remove it.
Use `tell` for `<File as Seek>::stream_position`
Some platforms have a more efficient way to get the current offset of the file than by seeking. For example, Wasi has `fd_tell` and SOLID has `SOLID_FS_Ftell`. Implement `<File as Seek>::stream_position()` in terms of those.
I do not use any APIs that were not already used in `std`. Although, the `libc` crate has [`ftell`](https://docs.rs/libc/latest/libc/fn.ftell.html), [`ftello`](https://docs.rs/libc/latest/libc/fn.ftello.html), and [`ftello64`](https://docs.rs/libc/latest/libc/fn.ftello64.html), I do not know platform coverage. It appears that Windows has no `tell`-like API.
I have checked that it builds on each relevant platform.
In 136324 the doctest for `f16::erf()` was gated with
`reliable_f16_math`. Add the same gate on `f16::erfc()` to
avoid:
rust_out.71e2e529d20ea47d-cgu.0:\
(.text._ZN8rust_out4main43_doctest_main_library_std_src_f16_rs_1321_017h485f3ffe6bf2a981E+0x38): \
undefined reference to `__gnu_h2f_ieee'
on MIPS (and maybe other architectures).
Use `const_error!` when possible
Replace usages of `io::Error::new(io::ErrorKind::Variant, "constant string")` with `io::const_error!(io::ErrorKind::Variant, "constant string")` to avoid allocations when possible. Additionally, fix `&&str` error messages in SGX and missing/misplaced trailing commas in `const_error!`.
* Order items as the average of the two adaptors. Enables easier diffs.
* Consistently apply #[inline].
* Implement FromInner<Vec<u8>> for bytes::Buf.
* Implement Clone::clone_from for wtf8::Buf.
Apply unsafe_op_in_unsafe_fn to the standard library
This applies unsafe_op_in_unsafe_fn to the standard library in preparation for updating to Rust 2024.
Closes https://github.com/rust-lang/rust/issues/127747 (I think?) cc ``@workingjubilee``
I have been testing a variety of targets, and I feel like they are all pretty much covered. I'll continue doing some testing async, but I don't expect to catch any more.
Forward all default methods for I/O impls
Forward all default methods for `&mut T` and `Box<T>` to the inner `io::Read`, `io::Write`, `io::Seek`, and `io::BufRead` types.
Windows: Update generated bindings
Update to windows-bindgen 0.59.
This update is aimed at reducing churn in the future, but means a bit more churn now:
- `bindings.txt` no longer needs us to write the namespace for each item. This is good because it means in the future we won't need to change them if the namespace changes. However, there are a few where we still need to disambiguate due to duplicate items (this is a bug in the upstream metadata).
- The output in `windows-sys.rs` is now sorted. It was mostly sorted before but not intentionally. This should mean future changes are less noisy.
The actual code changes are minimal here. A few types are now `bool` instead of `BOOLEAN`, which is more convenient.
Prepare standard library for Rust 2024 migration
This includes a variety of commits preparing the standard library for migration to Rust 2024.
The actual migration is blocked on a few things, so I wanted to get this out of the way in a relatively digestable PR.
These functions were changed to be safe in
https://github.com/rust-lang/rust/pull/127763, but this particular UWP
version was missed. Otherwise this causes unnecessary unsafe block
warnings/errors.
Remove the common prelude module
This fixes the issues described in https://github.com/rust-lang/rust/issues/136102. Primarily, this resolves some issues with how the documentation for the prelude is generated:
- It avoids showing "unstable" for macros in the prelude that are actually stable.
- Avoids duplication of some pages due to the previous lack of `doc(no_inline)`.
- Makes the different edition preludes consistent, and sets a pattern that can be used by future editions.
We may need to rearrange these modules in the future if we decide to remove anything from the prelude again. If we do, I think we should look into a different solution that avoids the documentation problems.
Closes https://github.com/rust-lang/rust/issues/136102
[AIX] expect `EINVAL` for `pthread_mutex_destroy`
Calling `pthread_mutex_destory` on a mutex initalized with the static initializer macro `PTHREAD_MUTEX_INITIALIZER` will result in `EINVAL` if the mutex is not lock/unlocked prior to calling `pthread_mutex_destroy`.
This generates a warning of irrefutable patterns. I decided to slightly
tweak the example so the closure returns unit, since the intent wasn't
to show the weird behavior of returning `!`.
Fix import in bench for wasm
This import was causing annoying unused import errors when checking the standard library for some wasm targets. The problem is that everything here is disabled if it is wasm32, but this import wasn't cfg'd.
std: replace the `FromInner` implementation for addresses with private conversion functions
Having these implementation available crate-wide means that platforms not using sockets for their networking code have to stub out the libc definitions required to support them. This PR moves the conversions to private helper functions that are only available where actually needed.
I also fixed the signature of the function converting from a C socket address to a Rust one: taking a reference to a `sockaddr_storage` resulted in unsound usage inside `LookupHost::next`, which could create a reference to a structure smaller than `sockaddr_storage`. Thus I've replaced the argument type with a pointer and made the function `unsafe`.
Having these implementation available crate-wide means that platforms not using sockets for their networking code have to stub out the libc definitions required to support them. This PR moves the conversions to private helper functions that are only available where actually needed.
I also fixed the signature of the function converting from a C socket address to a Rust one: taking a reference to a `sockaddr_storage` resulted in unsound usage inside `LookupHost::next`, which could create a reference to a structure smaller than `sockaddr_storage`. Thus I've replaced the argument type with a pointer and made the function `unsafe`.
Rollup of 8 pull requests
Successful merges:
- #134981 ( Explain that in paths generics can't be set on both the enum and the variant)
- #136698 (Replace i686-unknown-redox target with i586-unknown-redox)
- #136767 (improve host/cross target checking)
- #136829 ([rustdoc] Move line numbers into the `<code>` directly)
- #136875 (Rustc dev guide subtree update)
- #136900 (compiler: replace `ExternAbi::name` calls with formatters)
- #136913 (Put kobzol back on review rotation)
- #136915 (documentation fix: `f16` and `f128` are not double-precision)
r? `@ghost`
`@rustbot` modify labels: rollup
This feature is intended to provide expensive but thorough help for
developers who have an unexpected `TypeId` value and need to determine
what type it actually is. It causes `impl Debug for TypeId` to print
the type name in addition to the opaque ID hash, and in order to do so,
adds a name field to `TypeId`. The cost of this is the increased size of
`TypeId` and the need to store type names in the binary; therefore, it
is an optional feature.
It may be enabled via `cargo -Zbuild-std -Zbuild-std-features=debug_typeid`.
(Note that `-Zbuild-std-features` disables default features which you
may wish to reenable in addition; see
<https://doc.rust-lang.org/cargo/reference/unstable.html#build-std-features>.)
Example usage and output:
```
fn main() {
use std::any::{Any, TypeId};
dbg!(TypeId::of::<usize>(), drop::<usize>.type_id());
}
```
```
TypeId::of::<usize>() = TypeId(0x763d199bccd319899208909ed1a860c6 = usize)
drop::<usize>.type_id() = TypeId(0xe6a34bd13f8c92dd47806da07b8cca9a = core::mem::drop<usize>)
```
Also added feature declarations for the existing `debug_refcell` feature
so it is usable from the `rust.std-features` option of `config.toml`.
This fixes the issues described in
https://github.com/rust-lang/rust/issues/136102. Primarily, this
resolves some issues with how the documentation for the prelude is
generated:
- It avoids showing "unstable" for macros in the prelude that are
actually stable.
- Avoids duplication of some pages due to the previous lack of
`doc(no_inline)`.
- Makes the different edition preludes consistent, and sets a pattern
that can be used by future editions.
We may need to rearrange these modules in the future if we decide to
remove anything from the prelude again. If we do, I think we should look
into a different solution that avoids the documentation problems.
Update docs for impl keyword
This started as a fix for #79878, but also introduces some structure (headings), and elaborates a tiny bit on impl Trait syntax.
Improve examples for file locking
The `lock` and `try_lock` documentation states that "if the file not open for writing, it is unspecified whether this function returns an error." With this change, the examples use `File::create` instead of `File::open`, eliminating the possibility of someone blindly copying code with unspecified behavior.
rustfmt fails to format this match expression, because it has several
long string literals over the maximum line width. This seems to exhibit
rustfmt issues #3863 (Gives up on chains if any line is too long) and
#3156 (Fail to format match arm when other arm has long line).
Some miscellaneous edition-related library tweaks
Some library edition tweaks that can be done separately from upgrading the whole standard library to edition 2024 (which is blocked on getting the submodules upgraded, for example)
Use an `Option` for `FindNextFileHandle` in `ReadDir` instead of `INVALID_FILE_HANDLE` sentinel value
Sometimes we store an invalid handle when we don't want to return an error. We then check the handle before use in order to avoid actually using the invalid handle. However, using an `Option` for this is better and avoids us forgetting to check the handle is valid. This was noticed due to us closing the handle without checking for validity: bd6a6777f5/library/std/src/sys/pal/windows/fs.rs (L148-L151)
Update bootstrap compiler and rustfmt
The rustfmt version we previously used formats things differently from what the latest nightly rustfmt does. This causes issues for subtrees that get formatted both in-tree and in their own repo. Updating the rustfmt used in-tree solves those issues. Also bumped the bootstrap compiler as the stage0 update command always updates both at the same
time.
Rollup of 5 pull requests
Successful merges:
- #134679 (Windows: remove readonly files)
- #136213 (Allow Rust to use a number of libc filesystem calls)
- #136530 (Implement `x perf` directly in bootstrap)
- #136601 (Detect (non-raw) borrows of null ZST pointers in CheckNull)
- #136659 (Pick the max DWARF version when LTO'ing modules with different versions )
r? `@ghost`
`@rustbot` modify labels: rollup
Clean up `HashMap` and `HashSet` docs.
This commit makes some small, pedantic changes to the docs for `HashMap` and `HashSet`, which fixes that:
* "HashMap" is not always formatted as code (as in `HashMap`), and that
* `HashSet` sometimes references `HashMap` instead of itself.
Allow Rust to use a number of libc filesystem calls
This allows Rust on Fuchsia to use a number of function calls from libc:
* dirfd
* fdatasync
* flock with LOCK_EX, LOCK_SH, LOCK_NB, LOCK_UN
* fstatat
cc #120426
try-job: dist-various-2
Windows: remove readonly files
When calling `remove_file`, we shouldn't fail to delete readonly files. As the test makes clear, this make the Windows behaviour consistent with other platforms. This also makes us internally consistent with `remove_dir_all`.
try-job: x86_64-msvc-ext1
std: move `io` module out of `pal`, get rid of `sys_common::io`
Part of #117276.
This does two related things:
1. It moves the platform-specific definitions for `IoSlice`, `IoSliceMut` and `is_terminal` out of `pal` and into `sys` and unifies some of them.
2. It gets rid of `sys_common::io`, moving the non-platform-specific test helpers into `std::test_helpers` and the buffer size definition to the new `sys::io` module.
Rollup of 7 pull requests
Successful merges:
- #135179 (Make sure to use `Receiver` trait when extracting object method candidate)
- #136554 (Add `opt_alias_variances` and use it in outlives code)
- #136556 ([AIX] Update tests/ui/wait-forked-but-failed-child.rs to accomodate exiting and idle processes.)
- #136589 (Enable "jump to def" feature on rustc docs)
- #136615 (sys: net: Add UEFI stubs)
- #136635 (Remove outdated `base_port` calculation in std net test)
- #136682 (Move two windows process tests to tests/ui)
r? `@ghost`
`@rustbot` modify labels: rollup
Move two windows process tests to tests/ui
Spawning processes from std unit tests is not something it's well suited for so moving them into tests/ui is more robust and means we don't need to hack around `cmd.exe`.
Follow up to #136630
Remove outdated `base_port` calculation in std net test
This was never modified since `std::net` was originally introduced in 395709ca6d, when at that time, each CI runner was running multiple jobs concurrently. This seems to have originally caused issues with jobs fighting over the same ports. This is not the case in the current CI infrastructure, so remove this relic in favor of a simple constant base port number.
I double-checked `19600` and nearby port numbers, and this isn't a well-known port number AFAICT[^1].
Closes#136633.
[^1]: At the time of writing.
sys: net: Add UEFI stubs
- Just a copy of sys/net/unsupported.
- Will make the future net PRs easier to review.
- The reason for a separate folder instead of standalone file is that UEFI has separate the protocols for v4 and v6, and thus will need some abstractions to implement the Rust interface.
r? ``@jhpratt``
Remove some unnecessary parens in `assert!` conditions
While working on #122661, some of these started triggering our "unnecessary parens" lints due to a change in the `assert!` desugaring. A cursory search identified a few more. Some of these have been carried from before 1.0, were a bulk rename from the previous name of `assert!` left them in that state. I went and removed as many of these unnecessary parens as possible in order to have fewer annoyances in the future if we make the lint smarter.
While working on #122661, some of these started triggering our "unnecessary parens" lints due to a change in the `assert!` desugaring. A cursory search identified a few more. Some of these have been carried from before 1.0, were a bulk rename from the previous name of `assert!` left them in that state. I went and removed as many of these unnecessary parens as possible in order to have fewer annoyances in the future if we make the lint smarter.
This was never modified since `std::net` was originally introduced, when
each CI job was running multiple jobs concurrently which caused issues
with fighting over the same ports. This is not the case in the current
CI infrastructure, so remove this relic.
std: move network code into `sys`
As per #117276, this PR moves `sys_common::net` and the `sys::pal::net` into the newly created `sys::net` module. In order to support #135141, I've moved all the current network code into a separate `connection` module, future functions like `hostname` can live in separate modules.
I'll probably do a follow-up PR and clean up some of the actual code, this is mostly just a reorganization.
uefi: process: Add support for command environment variables
Set environment variables before launching the process and restore the prior variables after the program exists.
This is the same implementation as the one used by UEFI Shell Execute [0].
[0]: 2d2642f483/ShellPkg/Application/Shell/ShellProtocol.c (L1700)
Implement unstable `new_range` feature
Switches `a..b`, `a..`, and `a..=b` to resolve to the new range types.
For rust-lang/rfcs#3550
Tracking issue #123741
also adds the re-export that was missed in the original implementation of `new_range_api`
Move some std tests to integration tests
Unit tests directly inside of standard library crates require a very fragile way of building that is hard to reproduce outside of bootstrap.
Follow up to https://github.com/rust-lang/rust/pull/133859
As per #117276, this PR moves `sys_common::net` and the `sys::pal::net` into the newly created `sys::net` module. In order to support #135141, I've moved all the current network code into a separate `connection` module, future functions like `hostname` can live in separate modules.
I'll probably do a follow-up PR and clean up some of the actual code, this is mostly just a reorganization.
Set environment variables before launching the process and restore the
prior variables after the program exists.
This is the same implementation as the one used by UEFI Shell Execute [0].
[0]: 2d2642f483/ShellPkg/Application/Shell/ShellProtocol.c (L1700)
Signed-off-by: Ayush Singh <ayush@beagleboard.org>
docs: Documented Send and Sync requirements for Mutex + MutexGuard
This an attempt to continue where #123225 left off.
I did some light clean up from the work done in that PR.
I also documented the `!Send` + `Sync` implementations for `MutexGuard` to the best of my knowledge.
Let me know if I got anything wrong 😄fixes#122856
cc: ``@IoaNNUwU``
r? ``@joboet``
Improve documentation for file locking
Add notes to each method stating that locks get dropped on close.
Clarify the return values of the try methods: they're only defined if
the lock is held via a *different* file handle/descriptor. That goes
along with the documentation that calling them while holding a lock via
the *same* file handle/descriptor may deadlock.
Document the behavior of unlock if no lock is held.
r? `@m-ou-se`
(Documentation changes requested in https://github.com/rust-lang/rust/issues/130994 .)
uefi: Implement path
This PR is split off from https://github.com/rust-lang/rust/pull/135368 to reduce noise.
UEFI paths can be of 4 types:
1. Absolute Shell Path: Uses shell mappings
2. Absolute Device Path: this is what we want
3. Relative root: path relative to the current root.
4. Relative
Absolute shell path can be identified with `:` and Absolute Device path can be identified with `/`. Relative root path will start with `\`.
The algorithm is mostly taken from edk2 UEFI shell implementation and is somewhat simple. Check for the path type in order.
For Absolute Shell path, use `EFI_SHELL->GetDevicePathFromMap` to get a BorrowedDevicePath for the volume.
For Relative paths, we use the current working directory to construct the new path.
BorrowedDevicePath abstraction is needed to interact with `EFI_SHELL->GetDevicePathFromMap` which returns a Device Path Protocol with the lifetime of UEFI shell.
Absolute Shell paths cannot exist if UEFI shell is missing.
cc `@nicholasbishop`
Add notes to each method stating that locks get dropped on close.
Clarify the return values of the try methods: they're only defined if
the lock is held via a *different* file handle/descriptor. That goes
along with the documentation that calling them while holding a lock via
the *same* file handle/descriptor may deadlock.
Document the behavior of unlock if no lock is held.
Rollup of 8 pull requests
Successful merges:
- #133382 (Suggest considering casting fn item as fn pointer in more cases)
- #136092 (Test pipes also when not running on Windows and Linux simultaneously)
- #136190 (Remove duplicated code in RISC-V asm bad-reg test)
- #136192 (ci: remove unused windows runner)
- #136205 (Properly check that array length is valid type during built-in unsizing in index)
- #136211 (Update mdbook to 0.4.44)
- #136212 (Tweak `&mut self` suggestion span)
- #136214 (Make crate AST mutation accessible for driver callback)
r? `@ghost`
`@rustbot` modify labels: rollup
uefi: process: Fix args
- While working on process env support, I found that args were currently broken. Not sure how I missed it in the PR, but well here is the fix.
- Additionally, no point in adding space at the end of args.
* Renames the methods:
* `get_many_mut` -> `get_disjoint_mut`
* `get_many_unchecked_mut` -> `get_disjoint_unchecked_mut`
* Does not rename the feature flag: `get_many_mut`
* Marks the feature as stable
* Renames some helper stuff:
* `GetManyMutError` -> `GetDisjointMutError`
* `GetManyMutIndex` -> `GetDisjointMutIndex`
* `get_many_mut_helpers` -> `get_disjoint_mut_helpers`
* `get_many_check_valid` -> `get_disjoint_check_valid`
This only touches slice methods.
HashMap's methods and feature gates are not renamed here
(nor are they stabilized).
- While working on process env support, I found that args were currently
broken. Not sure how I missed it in the PR, but well here is the fix.
- Additionally, no point in adding space at the end of args.
Signed-off-by: Ayush Singh <ayush@beagleboard.org>
Move `std::io::pipe` code into its own file
Also update the docs for the new location, create a section "Platform-specific behavior", don't hide required imports for code examples.
Rollup of 7 pull requests
Successful merges:
- #133631 (Support QNX 7.1 with `io-sock`+libstd and QNX 8.0 (`no_std` only))
- #134358 (compiler: Set `target_abi = "ilp32e"` on all riscv32e targets)
- #135812 (Fix GDB `OsString` provider on Windows )
- #135842 (TRPL: more backward-compatible Edition changes)
- #135946 (Remove extra whitespace from rustdoc breadcrumbs for copypasting)
- #135953 (ci.py: check the return code in `run-local`)
- #136019 (Add an `unchecked_div` alias to the `Div<NonZero<_>>` impls)
r? `@ghost`
`@rustbot` modify labels: rollup
This removes two minor OnceLock tests which test private methods. The
rest of the tests should be more than enough to catch mistakes in those
private methods. Also makes ReentrantLock::try_lock public. And finally
it makes the mpmc tests actually run.
Support QNX 7.1 with `io-sock`+libstd and QNX 8.0 (`no_std` only)
Changes of this pull request:
1. Refactor code for qnx nto targets to share more code in file `nto_qnx.rs`
1. Add support for an additional network stack on nto qnx 7.1.
QNX 7.1 supports two network stacks:
1. `io-pkt`, which is default
2. `io-sock`, which is optional on 7.1 but default in QNX 8.0
As one can see in the [io-sock migration notes](https://www.qnx.com/developers/docs/7.1/index.html#com.qnx.doc.neutrino.io_sock/topic/migrate_app.html), this changes the libc API in a way similar to e.g. linux-gnu vs. linux-musl.
This change adds a new target which has a different value for `target_env`, so that e.g. libc can distinguish between both APIs.
2. Add initial support for QNX 8.0, thanks to AkhilTThomas. As it turned out, the problem with forking many processes still exists in QNX 8.0. Because if this, we are now using it for any QNX version (i.e. not check for `target_env` anymore).
Update emscripten std tests
This disables a bunch of emscripten tests that test things emscripten doesn't support and re-enables a whole bunch of tests which now work just fine on emscripten.
Tested with `EMCC_CFLAGS="-s MAXIMUM_MEMORY=2GB" ./x.py test library/ --target wasm32-unknown-emscripten`.
- Simplify some of the language
- Minor grammar fixes
- Don't imply that pipes *only* work across multiple processes; instead,
*suggest* that they're typically used across two or more separate
processes.
- Specify that portable applications cannot use multiple readers or
multiple writers for messages larger than a byte, due to potential
interleaving.
- Remove no-longer-referenced footnote URLs.
Fix set_name in thread mod for NuttX
Replace `pthread_set_name_np` with `pthread_setname_np` for NuttX in the `set_name` function, this change aligns the implementation with the correct API available on NuttX
This patch ensures thread naming works correctly on NuttX platforms.
See also:
0f9f8c91ad/src/unix/nuttx/mod.rs (L562)8f3a2a6f76/include/pthread.h (L511-L514)
Add `File already exists` error doc to `hard_link` function
## Description
If the link path already exists, the error `AlreadyExists` is returned. This commit adds this error to the docs.
I tested it with the current rust master version, this error was returned when there is already a link for the file is present.
This was the error returned:
```
[harshit:../Desktop/rust_compiler_testing/hard_link (master|…5)] cargo +stage1 run
Compiling hard_link v0.1.0 (/home/harshit/Desktop/rust_compiler_testing/hard_link)
Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.12s
Running `target/debug/hard_link`
Err(Os { code: 17, kind: AlreadyExists, message: "File exists" })
```
This is my first PR on rust, any suggestions on which issue I can take next are most welcome 😄Fixes#130117
Replace `pthread_set_name_np` with `pthread_setname_np` for NuttX in the `set_name` function,
this change aligns the implementation with the correct API available on NuttX
This patch ensures thread naming works correctly on NuttX platforms.
Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
Implement `ByteStr` and `ByteString` types
Approved ACP: https://github.com/rust-lang/libs-team/issues/502
Tracking issue: https://github.com/rust-lang/rust/issues/134915
These types represent human-readable strings that are conventionally,
but not always, UTF-8. The `Debug` impl prints non-UTF-8 bytes using
escape sequences, and the `Display` impl uses the Unicode replacement
character.
This is a minimal implementation of these types and associated trait
impls. It does not add any helper methods to other types such as `[u8]`
or `Vec<u8>`.
I've omitted a few implementations of `AsRef`, `AsMut`, and `Borrow`,
when those would be the second implementation for a type (counting the
`T` impl), to avoid potential inference failures. We can attempt to add
more impls later in standalone commits, and run them through crater.
In addition to the `bstr` feature, I've added a `bstr_internals` feature
for APIs provided by `core` for use by `alloc` but not currently
intended for stabilization.
This API and its implementation are based *heavily* on the `bstr` crate
by Andrew Gallant (`@BurntSushi).`
r? `@BurntSushi`
doc: Point to methods on `Command` as alternatives to `set/remove_var`
Make these methods more discoverable, as configuring a child process is a common reason for manipulating the environment.
Remove dead rustc_allowed_through_unstable_modules for std::os::fd contents
As far as I was able to reconstruct, the history here is roughly as follows:
- https://github.com/rust-lang/rust/pull/99723 added some `rustc_allowed_through_unstable_modules` to the types in `std::os::fd::raw` since they were accessible on stable via the unstable `std::os::wasi::io::AsRawFd` path. (This was needed to fix https://github.com/rust-lang/rust/issues/99502.)
- Shortly thereafter, https://github.com/rust-lang/rust/pull/98368 re-organized things so that instead of re-exporting from an internal `std::os::wasi::io::raw`, `std::os::wasi::io::AsRawFd` is now directly re-exported from `std::os::fd`. This also made `library/std/src/os/wasi/io/raw.rs` entirely dead code as far as I can tell, it's not imported by anything any more.
- Shortly thereafter, https://github.com/rust-lang/rust/pull/103308 stabilizes `std::os::wasi::io`, so `rustc_allowed_through_unstable_modules` is not needed any more to access `std::os::wasi::io::AsRawFd`. There is even a comment in `library/std/src/os/wasi/io/raw.rs` saying the attribute can be removed now, but that file is dead code so it is not touched as part of the stabilization.
I did a grep for `pub use crate::os::fd` and all the re-exports I could find are in stable modules. So given all that, we can remove the `rustc_allowed_through_unstable_modules` (hoping they are not also re-exported somewhere else, it's really hard to be sure about this).
I have checked that std still builds after this PR on the wasm32-wasip2 target.
Clarify note in `std::sync::LazyLock` example
I doubt most people know what it means, as I did not until a week ago. In the current form, it seems like a `TODO:`.
UEFI paths can be of 4 types:
1. Absolute Shell Path: Uses shell mappings
2. Absolute Device Path: this is what we want
3: Relative root: path relative to the current root.
4: Relative
Absolute shell path can be identified with `:` and Absolute Device path
can be identified with `/`. Relative root path will start with `\`.
The algorithm is mostly taken from edk2 UEFI shell implementation and is
somewhat simple. Check for the path type in order.
For Absolute Shell path, use `EFI_SHELL->GetDevicePathFromMap` to
get a BorrowedDevicePath for the volume.
For Relative paths, we use the current working directory to construct
the new path.
BorrowedDevicePath abstraction is needed to interact with
`EFI_SHELL->GetDevicePathFromMap` which returns a Device Path Protocol
with the lifetime of UEFI shell.
Absolute Shell paths cannot exist if UEFI shell is missing.
Signed-off-by: Ayush Singh <ayush@beagleboard.org>
std: lazily allocate the main thread handle
https://github.com/rust-lang/rust/pull/123550 eliminated the allocation of the main thread handle, but at the cost of greatly increased complexity. This PR proposes another approach: Instead of creating the main thread handle itself, the runtime simply remembers the thread ID of the main thread. The main thread handle is then only allocated when it is used, using the same lazy-initialization mechanism as for non-runtime use of `thread::current`, and the `name` method uses the thread ID to identify the main thread handle and return the correct name ("main") for it.
Thereby, we also allow accessing `thread::current` before main: as the runtime no longer tries to install its own handle, this will no longer trigger an abort. Rather, the name returned from `name` will only be "main" after the runtime initialization code has run, but I think that is acceptable.
This new approach also requires some changes to the signal handling code, as calling `thread::current` would now allocate when called on the main thread, which is not acceptable. I fixed this by adding a new function (`with_current_name`) that performs all the naming logic without allocation or without initializing the thread ID (which could allocate on some platforms).
Reverts #123550, CC ``@GnomedDev``
Update `ReadDir::next` in `std::sys::pal::unix::fs` to use `&raw const (*p).field` instead of `p.byte_offset().cast()`
Since https://github.com/rust-lang/reference/pull/1387 and https://github.com/rust-lang/rust/pull/117572, `&raw mut (*p).field`/`addr_of!((*p).field)` is defined to have the same inbounds preconditions as `ptr::offset`/`ptr::byte_offset`. I.e. `&raw const (*p).field` does not require that `p: *const T` point to a full `size_of::<T>()` bytes of memory, only that `p.byte_add(offset_of!(T, field))` is defined.
The old comment "[...] we don't even get to use `&raw const (*entry_ptr).d_name` because that operation requires the full extent of *entry_ptr to be in bounds of the same allocation, which is not necessarily the case here [...]" is now outdated, and the code can be simplified to use `&raw const (*entry_ptr).field`.
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There should be no behavior differences from this PR.
The `: *const dirent64` on line 716 and the `const _: usize = mem::offset_of!(dirent64, $field);` and comment on lines 749-751 are just sanity checks and should not affect semantics.
Since the `offset_ptr!` macro is only called three times, and all with the same local variable entry_ptr, I just used the local variable directly in the macro instead of taking it as an input, and renamed the macro to `entry_field_ptr!`.
The whole macro could also be removed and replaced with just using `&raw const (*entry_ptr).field` in the three places, but the comments on the macro seemed worthwhile to keep.
Also, the macro is only called three times, and all with the same local variable entry_ptr, so just use the local variable directly,
and rename the macro to entry_field_ptr.
