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Rollup merge of #130136 - GKFX:stabilize-const-pin, r=dtolnay

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Partially stabilize const_pin

Tracking issue #76654.

Eight of these methods can be made const-stable. The remainder are blocked on #73255.
This commit is contained in:
许杰友 Jieyou Xu (Joe) 2024-10-18 12:00:50 +01:00 committed by GitHub
commit dae3076fa2
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GPG Key ID: B5690EEEBB952194
5 changed files with 16 additions and 13 deletions
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1
library/alloc/src/lib.rs
View File

@ -112,7 +112,6 @@
#![feature(const_eval_select)]
#![feature(const_heap)]
#![feature(const_maybe_uninit_write)]
#![feature(const_pin)]
#![feature(const_size_of_val)]
#![feature(const_vec_string_slice)]
#![feature(core_intrinsics)]

2
library/core/src/lib.rs
View File

@ -129,7 +129,7 @@
#![feature(const_nonnull_new)]
#![feature(const_num_midpoint)]
#![feature(const_option_ext)]
#![feature(const_pin)]
#![feature(const_pin_2)]
#![feature(const_pointer_is_aligned)]
#![feature(const_ptr_is_null)]
#![feature(const_ptr_sub_ptr)]

20
library/core/src/pin.rs
View File

@ -1186,7 +1186,7 @@ impl<Ptr: Deref<Target: Unpin>> Pin<Ptr> {
/// let mut pinned: Pin<&mut u8> = Pin::new(&mut val);
/// ```
#[inline(always)]
#[rustc_const_unstable(feature = "const_pin", issue = "76654")]
#[rustc_const_stable(feature = "const_pin", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "pin", since = "1.33.0")]
pub const fn new(pointer: Ptr) -> Pin<Ptr> {
// SAFETY: the value pointed to is `Unpin`, and so has no requirements
@ -1214,7 +1214,7 @@ pub const fn new(pointer: Ptr) -> Pin<Ptr> {
/// assert_eq!(*r, 5);
/// ```
#[inline(always)]
#[rustc_const_unstable(feature = "const_pin", issue = "76654")]
#[rustc_const_unstable(feature = "const_pin_2", issue = "76654")]
#[stable(feature = "pin_into_inner", since = "1.39.0")]
pub const fn into_inner(pin: Pin<Ptr>) -> Ptr {
pin.__pointer
@ -1351,7 +1351,7 @@ impl<Ptr: Deref> Pin<Ptr> {
/// [`pin` module docs]: self
#[lang = "new_unchecked"]
#[inline(always)]
#[rustc_const_unstable(feature = "const_pin", issue = "76654")]
#[rustc_const_stable(feature = "const_pin", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "pin", since = "1.33.0")]
pub const unsafe fn new_unchecked(pointer: Ptr) -> Pin<Ptr> {
Pin { __pointer: pointer }
@ -1503,7 +1503,7 @@ impl<Ptr: Deref> Pin<Ptr> {
/// If the underlying data is [`Unpin`], [`Pin::into_inner`] should be used
/// instead.
#[inline(always)]
#[rustc_const_unstable(feature = "const_pin", issue = "76654")]
#[rustc_const_unstable(feature = "const_pin_2", issue = "76654")]
#[stable(feature = "pin_into_inner", since = "1.39.0")]
pub const unsafe fn into_inner_unchecked(pin: Pin<Ptr>) -> Ptr {
pin.__pointer
@ -1559,7 +1559,7 @@ pub unsafe fn map_unchecked<U, F>(self, func: F) -> Pin<&'a U>
/// ["pinning projections"]: self#projections-and-structural-pinning
#[inline(always)]
#[must_use]
#[rustc_const_unstable(feature = "const_pin", issue = "76654")]
#[rustc_const_stable(feature = "const_pin", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "pin", since = "1.33.0")]
pub const fn get_ref(self) -> &'a T {
self.__pointer
@ -1570,7 +1570,7 @@ impl<'a, T: ?Sized> Pin<&'a mut T> {
/// Converts this `Pin<&mut T>` into a `Pin<&T>` with the same lifetime.
#[inline(always)]
#[must_use = "`self` will be dropped if the result is not used"]
#[rustc_const_unstable(feature = "const_pin", issue = "76654")]
#[rustc_const_stable(feature = "const_pin", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "pin", since = "1.33.0")]
pub const fn into_ref(self) -> Pin<&'a T> {
Pin { __pointer: self.__pointer }
@ -1588,7 +1588,7 @@ pub const fn into_ref(self) -> Pin<&'a T> {
#[inline(always)]
#[must_use = "`self` will be dropped if the result is not used"]
#[stable(feature = "pin", since = "1.33.0")]
#[rustc_const_unstable(feature = "const_pin", issue = "76654")]
#[rustc_const_stable(feature = "const_pin", since = "CURRENT_RUSTC_VERSION")]
pub const fn get_mut(self) -> &'a mut T
where
T: Unpin,
@ -1609,7 +1609,7 @@ pub const fn get_mut(self) -> &'a mut T
#[inline(always)]
#[must_use = "`self` will be dropped if the result is not used"]
#[stable(feature = "pin", since = "1.33.0")]
#[rustc_const_unstable(feature = "const_pin", issue = "76654")]
#[rustc_const_stable(feature = "const_pin", since = "CURRENT_RUSTC_VERSION")]
pub const unsafe fn get_unchecked_mut(self) -> &'a mut T {
self.__pointer
}
@ -1652,7 +1652,7 @@ impl<T: ?Sized> Pin<&'static T> {
/// This is safe because `T` is borrowed immutably for the `'static` lifetime, which
/// never ends.
#[stable(feature = "pin_static_ref", since = "1.61.0")]
#[rustc_const_unstable(feature = "const_pin", issue = "76654")]
#[rustc_const_stable(feature = "const_pin", since = "CURRENT_RUSTC_VERSION")]
pub const fn static_ref(r: &'static T) -> Pin<&'static T> {
// SAFETY: The 'static borrow guarantees the data will not be
// moved/invalidated until it gets dropped (which is never).
@ -1666,7 +1666,7 @@ impl<T: ?Sized> Pin<&'static mut T> {
/// This is safe because `T` is borrowed for the `'static` lifetime, which
/// never ends.
#[stable(feature = "pin_static_ref", since = "1.61.0")]
#[rustc_const_unstable(feature = "const_pin", issue = "76654")]
#[rustc_const_stable(feature = "const_pin", since = "CURRENT_RUSTC_VERSION")]
pub const fn static_mut(r: &'static mut T) -> Pin<&'static mut T> {
// SAFETY: The 'static borrow guarantees the data will not be
// moved/invalidated until it gets dropped (which is never).

2
library/core/tests/lib.rs
View File

@ -21,7 +21,7 @@
#![feature(const_likely)]
#![feature(const_nonnull_new)]
#![feature(const_option_ext)]
#![feature(const_pin)]
#![feature(const_pin_2)]
#![feature(const_pointer_is_aligned)]
#![feature(const_three_way_compare)]
#![feature(const_trait_impl)]

4
library/core/tests/pin.rs
View File

@ -19,6 +19,10 @@ fn pin_const() {
const REF: &'static usize = PINNED.get_ref();
assert_eq!(REF, POINTER);
const INT: u8 = 42;
const STATIC_REF: Pin<&'static u8> = Pin::static_ref(&INT);
assert_eq!(*STATIC_REF, INT);
// Note: `pin_mut_const` tests that the methods of `Pin<&mut T>` are usable in a const context.
// A const fn is used because `&mut` is not (yet) usable in constants.
const fn pin_mut_const() {