Tracking Issue for `new_zeroed_alloc` #129396

workingjubilee · 2024-08-22T05:38:08Z

Feature gate: #![feature(new_zeroed_alloc)]

Split-out from #63291 as a result of stabilizing most of its API! It's zeroed instead of uninit constructors, nothing too complicated!

Public API

It's new_zeroed and new_zeroed_slice on every major allocation type like Box, Rc, Arc.

impl<T> Box<T> { pub fn new_zeroed() -> Box<MaybeUninit<T>> {…} }
impl<T> Arc<T> { pub fn new_zeroed() -> Arc<MaybeUninit<T>> {…} }
impl<T> Rc<T> { pub fn new_zeroed() -> Rc<MaybeUninit<T>> {…} }

impl<[T]> Box<T> { pub fn new_zeroed_slice() -> Box<MaybeUninit<[T]>> {…} }
impl<[T]> Arc<T> { pub fn new_zeroed_slice() -> Arc<MaybeUninit<[T]>> {…} }
impl<[T]> Rc<T> { pub fn new_zeroed_slice() -> Rc<MaybeUninit<[T]>> {…} }

Steps / History

Implementation: #...
- added in alloc: Add new_zeroed() versions like new_uninit(). #66128
- other API was added in Tracking issue for uninitialized constructors for Box, Rc, Arc #63291
Final comment period (FCP)¹
Stabilization PR

Unresolved Questions

idk lol

https://std-dev-guide.rust-lang.org/feature-lifecycle/stabilization.html ↩

The text was updated successfully, but these errors were encountered:

…n-of-stabilization, r=<try> Partially stabilize `feature(new_uninit)` Finished comment period: rust-lang#63291 (comment) The following API has been stabilized from rust-lang#63291 ```rust impl<T> Box<T> { pub fn new_uninit() -> Box<MaybeUninit<T>> {…} } impl<T> Rc<T> { pub fn new_uninit() -> Rc<MaybeUninit<T>> {…} } impl<T> Arc<T> { pub fn new_uninit() -> Arc<MaybeUninit<T>> {…} } impl<T> Box<[T]> { pub fn new_uninit_slice(len: usize) -> Box<[MaybeUninit<T>]> {…} } impl<T> Rc<[T]> { pub fn new_uninit_slice(len: usize) -> Rc<[MaybeUninit<T>]> {…} } impl<T> Arc<[T]> { pub fn new_uninit_slice(len: usize) -> Arc<[MaybeUninit<T>]> {…} } impl<T> Box<MaybeUninit<T>> { pub unsafe fn assume_init(self) -> Box<T> {…} } impl<T> Box<[MaybeUninit<T>]> { pub unsafe fn assume_init(self) -> Box<[T]> {…} } impl<T> Rc<MaybeUninit<T>> { pub unsafe fn assume_init(self) -> Rc<T> {…} } impl<T> Rc<[MaybeUninit<T>]> { pub unsafe fn assume_init(self) -> Rc<[T]> {…} } impl<T> Arc<MaybeUninit<T>> { pub unsafe fn assume_init(self) -> Arc<T> {…} } impl<T> Arc<[MaybeUninit<T>]> { pub unsafe fn assume_init(self) -> Arc<[T]> {…} } ``` The remaining API is split between new issues - `new_zeroed_alloc`: rust-lang#129396 - `box_uninit_write`: rust-lang#129397 All relevant code is thus either stabilized or split out of that issue, so this closes rust-lang#63291 as, with the FCP concluded, that issue has served its purpose. try-job: x86_64-rust-for-linux

…ion-of-stabilization, r=dtolnay Partially stabilize `feature(new_uninit)` Finished comment period: rust-lang#63291 (comment) The following API has been stabilized from rust-lang#63291 ```rust impl<T> Box<T> { pub fn new_uninit() -> Box<MaybeUninit<T>> {…} } impl<T> Rc<T> { pub fn new_uninit() -> Rc<MaybeUninit<T>> {…} } impl<T> Arc<T> { pub fn new_uninit() -> Arc<MaybeUninit<T>> {…} } impl<T> Box<[T]> { pub fn new_uninit_slice(len: usize) -> Box<[MaybeUninit<T>]> {…} } impl<T> Rc<[T]> { pub fn new_uninit_slice(len: usize) -> Rc<[MaybeUninit<T>]> {…} } impl<T> Arc<[T]> { pub fn new_uninit_slice(len: usize) -> Arc<[MaybeUninit<T>]> {…} } impl<T> Box<MaybeUninit<T>> { pub unsafe fn assume_init(self) -> Box<T> {…} } impl<T> Box<[MaybeUninit<T>]> { pub unsafe fn assume_init(self) -> Box<[T]> {…} } impl<T> Rc<MaybeUninit<T>> { pub unsafe fn assume_init(self) -> Rc<T> {…} } impl<T> Rc<[MaybeUninit<T>]> { pub unsafe fn assume_init(self) -> Rc<[T]> {…} } impl<T> Arc<MaybeUninit<T>> { pub unsafe fn assume_init(self) -> Arc<T> {…} } impl<T> Arc<[MaybeUninit<T>]> { pub unsafe fn assume_init(self) -> Arc<[T]> {…} } ``` The remaining API is split between new issues - `new_zeroed_alloc`: rust-lang#129396 - `box_uninit_write`: rust-lang#129397 All relevant code is thus either stabilized or split out of that issue, so this closes rust-lang#63291 as, with the FCP concluded, that issue has served its purpose. try-job: x86_64-rust-for-linux

…ion-of-stabilization, r=dtolnay,joboet Partially stabilize `feature(new_uninit)` Finished comment period: rust-lang#63291 (comment) The following API has been stabilized from rust-lang#63291 ```rust impl<T> Box<T> { pub fn new_uninit() -> Box<MaybeUninit<T>> {…} } impl<T> Rc<T> { pub fn new_uninit() -> Rc<MaybeUninit<T>> {…} } impl<T> Arc<T> { pub fn new_uninit() -> Arc<MaybeUninit<T>> {…} } impl<T> Box<[T]> { pub fn new_uninit_slice(len: usize) -> Box<[MaybeUninit<T>]> {…} } impl<T> Rc<[T]> { pub fn new_uninit_slice(len: usize) -> Rc<[MaybeUninit<T>]> {…} } impl<T> Arc<[T]> { pub fn new_uninit_slice(len: usize) -> Arc<[MaybeUninit<T>]> {…} } impl<T> Box<MaybeUninit<T>> { pub unsafe fn assume_init(self) -> Box<T> {…} } impl<T> Box<[MaybeUninit<T>]> { pub unsafe fn assume_init(self) -> Box<[T]> {…} } impl<T> Rc<MaybeUninit<T>> { pub unsafe fn assume_init(self) -> Rc<T> {…} } impl<T> Rc<[MaybeUninit<T>]> { pub unsafe fn assume_init(self) -> Rc<[T]> {…} } impl<T> Arc<MaybeUninit<T>> { pub unsafe fn assume_init(self) -> Arc<T> {…} } impl<T> Arc<[MaybeUninit<T>]> { pub unsafe fn assume_init(self) -> Arc<[T]> {…} } ``` The remaining API is split between new issues - `new_zeroed_alloc`: rust-lang#129396 - `box_uninit_write`: rust-lang#129397 All relevant code is thus either stabilized or split out of that issue, so this closes rust-lang#63291 as, with the FCP concluded, that issue has served its purpose. try-job: x86_64-rust-for-linux

Rollup merge of rust-lang#129401 - workingjubilee:partial-initialization-of-stabilization, r=dtolnay,joboet Partially stabilize `feature(new_uninit)` Finished comment period: rust-lang#63291 (comment) The following API has been stabilized from rust-lang#63291 ```rust impl<T> Box<T> { pub fn new_uninit() -> Box<MaybeUninit<T>> {…} } impl<T> Rc<T> { pub fn new_uninit() -> Rc<MaybeUninit<T>> {…} } impl<T> Arc<T> { pub fn new_uninit() -> Arc<MaybeUninit<T>> {…} } impl<T> Box<[T]> { pub fn new_uninit_slice(len: usize) -> Box<[MaybeUninit<T>]> {…} } impl<T> Rc<[T]> { pub fn new_uninit_slice(len: usize) -> Rc<[MaybeUninit<T>]> {…} } impl<T> Arc<[T]> { pub fn new_uninit_slice(len: usize) -> Arc<[MaybeUninit<T>]> {…} } impl<T> Box<MaybeUninit<T>> { pub unsafe fn assume_init(self) -> Box<T> {…} } impl<T> Box<[MaybeUninit<T>]> { pub unsafe fn assume_init(self) -> Box<[T]> {…} } impl<T> Rc<MaybeUninit<T>> { pub unsafe fn assume_init(self) -> Rc<T> {…} } impl<T> Rc<[MaybeUninit<T>]> { pub unsafe fn assume_init(self) -> Rc<[T]> {…} } impl<T> Arc<MaybeUninit<T>> { pub unsafe fn assume_init(self) -> Arc<T> {…} } impl<T> Arc<[MaybeUninit<T>]> { pub unsafe fn assume_init(self) -> Arc<[T]> {…} } ``` The remaining API is split between new issues - `new_zeroed_alloc`: rust-lang#129396 - `box_uninit_write`: rust-lang#129397 All relevant code is thus either stabilized or split out of that issue, so this closes rust-lang#63291 as, with the FCP concluded, that issue has served its purpose. try-job: x86_64-rust-for-linux

…abilization, r=dtolnay,joboet Partially stabilize `feature(new_uninit)` Finished comment period: rust-lang/rust#63291 (comment) The following API has been stabilized from rust-lang/rust#63291 ```rust impl<T> Box<T> { pub fn new_uninit() -> Box<MaybeUninit<T>> {…} } impl<T> Rc<T> { pub fn new_uninit() -> Rc<MaybeUninit<T>> {…} } impl<T> Arc<T> { pub fn new_uninit() -> Arc<MaybeUninit<T>> {…} } impl<T> Box<[T]> { pub fn new_uninit_slice(len: usize) -> Box<[MaybeUninit<T>]> {…} } impl<T> Rc<[T]> { pub fn new_uninit_slice(len: usize) -> Rc<[MaybeUninit<T>]> {…} } impl<T> Arc<[T]> { pub fn new_uninit_slice(len: usize) -> Arc<[MaybeUninit<T>]> {…} } impl<T> Box<MaybeUninit<T>> { pub unsafe fn assume_init(self) -> Box<T> {…} } impl<T> Box<[MaybeUninit<T>]> { pub unsafe fn assume_init(self) -> Box<[T]> {…} } impl<T> Rc<MaybeUninit<T>> { pub unsafe fn assume_init(self) -> Rc<T> {…} } impl<T> Rc<[MaybeUninit<T>]> { pub unsafe fn assume_init(self) -> Rc<[T]> {…} } impl<T> Arc<MaybeUninit<T>> { pub unsafe fn assume_init(self) -> Arc<T> {…} } impl<T> Arc<[MaybeUninit<T>]> { pub unsafe fn assume_init(self) -> Arc<[T]> {…} } ``` The remaining API is split between new issues - `new_zeroed_alloc`: rust-lang/rust#129396 - `box_uninit_write`: rust-lang/rust#129397 All relevant code is thus either stabilized or split out of that issue, so this closes #63291 as, with the FCP concluded, that issue has served its purpose. try-job: x86_64-rust-for-linux

Needed in order to build with newest nightly More specific version of new_uninit as introduced in rust-lang/rust#129396

Needed in order to build with newest nightly More specific version of new_uninit introduced in rust-lang/rust#129396

``` warning: the feature `new_uninit` has been stable since 1.82.0 and no longer requires an attribute to enable --> src/lib.rs:5:12 | 5 | #![feature(new_uninit)] | ^^^^^^^^^^ | = note: `#[warn(stable_features)]` on by default error[E0658]: use of unstable library feature 'new_zeroed_alloc' --> src/nvme.rs:20:41 | 20 | let p: Box<SectorBuffer> = unsafe { Box::new_zeroed().assume_init() }; | ^^^^^^^^^^^^^^^ | = note: see issue #129396 <rust-lang/rust#129396> for more information = help: add `#![feature(new_zeroed_alloc)]` to the crate attributes to enable ```

``` warning: the feature `new_uninit` has been stable since 1.82.0 and no longer requires an attribute to enable --> src/lib.rs:5:12 | 5 | #![feature(new_uninit)] | ^^^^^^^^^^ | = note: `#[warn(stable_features)]` on by default error[E0658]: use of unstable library feature 'new_zeroed_alloc' --> src/nvme.rs:20:41 | 20 | let p: Box<SectorBuffer> = unsafe { Box::new_zeroed().assume_init() }; | ^^^^^^^^^^^^^^^ | = note: see issue #129396 <rust-lang/rust#129396> for more information = help: add `#![feature(new_zeroed_alloc)]` to the crate attributes to enable ``` Signed-off-by: Davide Cavalca <dcavalca@fedoraproject.org>

workingjubilee added T-libs-api Relevant to the library API team, which will review and decide on the PR/issue. C-tracking-issue Category: A tracking issue for an RFC or an unstable feature. labels Aug 22, 2024

This was referenced Aug 22, 2024

Partially stabilize feature(new_uninit) #129401

Merged

library: Move unstable API of new_uninit to new features #129416

Merged

kkysen mentioned this issue Sep 19, 2024

Large number of page faults occurring in fn rav1d_submit_frame memorysafety/rav1d#1358

Open

wasv added a commit to wasv/dust that referenced this issue Oct 10, 2024

Updates feature gate to use new_zeroed_alloc

94079c9

Needed in order to build with newest nightly More specific version of new_uninit as introduced in rust-lang/rust#129396

wasv mentioned this issue Oct 10, 2024

Updates feature gate to use new_zeroed_alloc kelpsyberry/dust#9

Merged

wasv added a commit to wasv/emu-utils that referenced this issue Oct 10, 2024

Updates feature gate to use new_zeroed_alloc

9854d84

Needed in order to build with newest nightly More specific version of new_uninit introduced in rust-lang/rust#129396

wasv mentioned this issue Oct 10, 2024

Updates feature gate to use new_zeroed_alloc kelpsyberry/emu-utils#1

Merged

kkysen mentioned this issue Oct 21, 2024

Try using new_zeroed_slice to optimize f.mvs with zeroed allocations memorysafety/rav1d#1360

Open

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Tracking Issue for `new_zeroed_alloc` #129396

Tracking Issue for `new_zeroed_alloc` #129396

workingjubilee commented Aug 22, 2024 •

edited

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Tracking Issue for new_zeroed_alloc #129396

Tracking Issue for new_zeroed_alloc #129396

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workingjubilee commented Aug 22, 2024 • edited Loading

Public API

Steps / History

Unresolved Questions

Footnotes

Tracking Issue for `new_zeroed_alloc` #129396

Tracking Issue for `new_zeroed_alloc` #129396

workingjubilee commented Aug 22, 2024 •

edited

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