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-rw-r--r--rust/Makefile4
-rw-r--r--rust/alloc/alloc.rs20
-rw-r--r--rust/alloc/boxed.rs131
-rw-r--r--rust/alloc/lib.rs48
-rw-r--r--rust/alloc/raw_vec.rs18
-rw-r--r--rust/alloc/slice.rs43
-rw-r--r--rust/alloc/vec/drain.rs8
-rw-r--r--rust/alloc/vec/drain_filter.rs8
-rw-r--r--rust/alloc/vec/into_iter.rs35
-rw-r--r--rust/alloc/vec/mod.rs84
-rw-r--r--rust/compiler_builtins.rs7
-rw-r--r--rust/kernel/allocator.rs51
12 files changed, 206 insertions, 251 deletions
diff --git a/rust/Makefile b/rust/Makefile
index 1ffdff6c2a34..b278908c19e5 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -379,8 +379,8 @@ rust-analyzer:
$(if $(KBUILD_EXTMOD),$(extmod_prefix),$(objtree))/rust-project.json
redirect-intrinsics = \
- __eqsf2 __gesf2 __lesf2 __nesf2 __unordsf2 \
- __unorddf2 \
+ __addsf3 __eqsf2 __gesf2 __lesf2 __ltsf2 __mulsf3 __nesf2 __unordsf2 \
+ __adddf3 __ledf2 __ltdf2 __muldf3 __unorddf2 \
__muloti4 __multi3 \
__udivmodti4 __udivti3 __umodti3
diff --git a/rust/alloc/alloc.rs b/rust/alloc/alloc.rs
index acf22d45e6f2..0b6bf5b6da43 100644
--- a/rust/alloc/alloc.rs
+++ b/rust/alloc/alloc.rs
@@ -16,8 +16,6 @@ use core::ptr::{self, NonNull};
#[doc(inline)]
pub use core::alloc::*;
-use core::marker::Destruct;
-
#[cfg(test)]
mod tests;
@@ -41,6 +39,9 @@ extern "Rust" {
#[rustc_allocator_zeroed]
#[rustc_nounwind]
fn __rust_alloc_zeroed(size: usize, align: usize) -> *mut u8;
+
+ #[cfg(not(bootstrap))]
+ static __rust_no_alloc_shim_is_unstable: u8;
}
/// The global memory allocator.
@@ -94,7 +95,14 @@ pub use std::alloc::Global;
#[must_use = "losing the pointer will leak memory"]
#[inline]
pub unsafe fn alloc(layout: Layout) -> *mut u8 {
- unsafe { __rust_alloc(layout.size(), layout.align()) }
+ unsafe {
+ // Make sure we don't accidentally allow omitting the allocator shim in
+ // stable code until it is actually stabilized.
+ #[cfg(not(bootstrap))]
+ core::ptr::read_volatile(&__rust_no_alloc_shim_is_unstable);
+
+ __rust_alloc(layout.size(), layout.align())
+ }
}
/// Deallocate memory with the global allocator.
@@ -333,16 +341,12 @@ unsafe fn exchange_malloc(size: usize, align: usize) -> *mut u8 {
#[cfg_attr(not(test), lang = "box_free")]
#[inline]
-#[rustc_const_unstable(feature = "const_box", issue = "92521")]
// This signature has to be the same as `Box`, otherwise an ICE will happen.
// When an additional parameter to `Box` is added (like `A: Allocator`), this has to be added here as
// well.
// For example if `Box` is changed to `struct Box<T: ?Sized, A: Allocator>(Unique<T>, A)`,
// this function has to be changed to `fn box_free<T: ?Sized, A: Allocator>(Unique<T>, A)` as well.
-pub(crate) const unsafe fn box_free<T: ?Sized, A: ~const Allocator + ~const Destruct>(
- ptr: Unique<T>,
- alloc: A,
-) {
+pub(crate) unsafe fn box_free<T: ?Sized, A: Allocator>(ptr: Unique<T>, alloc: A) {
unsafe {
let size = size_of_val(ptr.as_ref());
let align = min_align_of_val(ptr.as_ref());
diff --git a/rust/alloc/boxed.rs b/rust/alloc/boxed.rs
index 14af9860c36c..c8173cea8317 100644
--- a/rust/alloc/boxed.rs
+++ b/rust/alloc/boxed.rs
@@ -152,16 +152,13 @@ use core::any::Any;
use core::async_iter::AsyncIterator;
use core::borrow;
use core::cmp::Ordering;
-use core::convert::{From, TryFrom};
use core::error::Error;
use core::fmt;
use core::future::Future;
use core::hash::{Hash, Hasher};
-#[cfg(not(no_global_oom_handling))]
-use core::iter::FromIterator;
-use core::iter::{FusedIterator, Iterator};
+use core::iter::FusedIterator;
use core::marker::Tuple;
-use core::marker::{Destruct, Unpin, Unsize};
+use core::marker::Unsize;
use core::mem;
use core::ops::{
CoerceUnsized, Deref, DerefMut, DispatchFromDyn, Generator, GeneratorState, Receiver,
@@ -218,6 +215,7 @@ impl<T> Box<T> {
#[inline(always)]
#[stable(feature = "rust1", since = "1.0.0")]
#[must_use]
+ #[rustc_diagnostic_item = "box_new"]
pub fn new(x: T) -> Self {
#[rustc_box]
Box::new(x)
@@ -287,9 +285,7 @@ impl<T> Box<T> {
#[must_use]
#[inline(always)]
pub fn pin(x: T) -> Pin<Box<T>> {
- (#[rustc_box]
- Box::new(x))
- .into()
+ Box::new(x).into()
}
/// Allocates memory on the heap then places `x` into it,
@@ -381,12 +377,11 @@ impl<T, A: Allocator> Box<T, A> {
/// ```
#[cfg(not(no_global_oom_handling))]
#[unstable(feature = "allocator_api", issue = "32838")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[must_use]
#[inline]
- pub const fn new_in(x: T, alloc: A) -> Self
+ pub fn new_in(x: T, alloc: A) -> Self
where
- A: ~const Allocator + ~const Destruct,
+ A: Allocator,
{
let mut boxed = Self::new_uninit_in(alloc);
unsafe {
@@ -411,12 +406,10 @@ impl<T, A: Allocator> Box<T, A> {
/// # Ok::<(), std::alloc::AllocError>(())
/// ```
#[unstable(feature = "allocator_api", issue = "32838")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[inline]
- pub const fn try_new_in(x: T, alloc: A) -> Result<Self, AllocError>
+ pub fn try_new_in(x: T, alloc: A) -> Result<Self, AllocError>
where
- T: ~const Destruct,
- A: ~const Allocator + ~const Destruct,
+ A: Allocator,
{
let mut boxed = Self::try_new_uninit_in(alloc)?;
unsafe {
@@ -446,13 +439,12 @@ impl<T, A: Allocator> Box<T, A> {
/// assert_eq!(*five, 5)
/// ```
#[unstable(feature = "allocator_api", issue = "32838")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[cfg(not(no_global_oom_handling))]
#[must_use]
// #[unstable(feature = "new_uninit", issue = "63291")]
- pub const fn new_uninit_in(alloc: A) -> Box<mem::MaybeUninit<T>, A>
+ pub fn new_uninit_in(alloc: A) -> Box<mem::MaybeUninit<T>, A>
where
- A: ~const Allocator + ~const Destruct,
+ A: Allocator,
{
let layout = Layout::new::<mem::MaybeUninit<T>>();
// NOTE: Prefer match over unwrap_or_else since closure sometimes not inlineable.
@@ -487,10 +479,9 @@ impl<T, A: Allocator> Box<T, A> {
/// ```
#[unstable(feature = "allocator_api", issue = "32838")]
// #[unstable(feature = "new_uninit", issue = "63291")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
- pub const fn try_new_uninit_in(alloc: A) -> Result<Box<mem::MaybeUninit<T>, A>, AllocError>
+ pub fn try_new_uninit_in(alloc: A) -> Result<Box<mem::MaybeUninit<T>, A>, AllocError>
where
- A: ~const Allocator + ~const Destruct,
+ A: Allocator,
{
let layout = Layout::new::<mem::MaybeUninit<T>>();
let ptr = alloc.allocate(layout)?.cast();
@@ -518,13 +509,12 @@ impl<T, A: Allocator> Box<T, A> {
///
/// [zeroed]: mem::MaybeUninit::zeroed
#[unstable(feature = "allocator_api", issue = "32838")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[cfg(not(no_global_oom_handling))]
// #[unstable(feature = "new_uninit", issue = "63291")]
#[must_use]
- pub const fn new_zeroed_in(alloc: A) -> Box<mem::MaybeUninit<T>, A>
+ pub fn new_zeroed_in(alloc: A) -> Box<mem::MaybeUninit<T>, A>
where
- A: ~const Allocator + ~const Destruct,
+ A: Allocator,
{
let layout = Layout::new::<mem::MaybeUninit<T>>();
// NOTE: Prefer match over unwrap_or_else since closure sometimes not inlineable.
@@ -559,10 +549,9 @@ impl<T, A: Allocator> Box<T, A> {
/// [zeroed]: mem::MaybeUninit::zeroed
#[unstable(feature = "allocator_api", issue = "32838")]
// #[unstable(feature = "new_uninit", issue = "63291")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
- pub const fn try_new_zeroed_in(alloc: A) -> Result<Box<mem::MaybeUninit<T>, A>, AllocError>
+ pub fn try_new_zeroed_in(alloc: A) -> Result<Box<mem::MaybeUninit<T>, A>, AllocError>
where
- A: ~const Allocator + ~const Destruct,
+ A: Allocator,
{
let layout = Layout::new::<mem::MaybeUninit<T>>();
let ptr = alloc.allocate_zeroed(layout)?.cast();
@@ -578,12 +567,11 @@ impl<T, A: Allocator> Box<T, A> {
/// construct a (pinned) `Box` in a different way than with [`Box::new_in`].
#[cfg(not(no_global_oom_handling))]
#[unstable(feature = "allocator_api", issue = "32838")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[must_use]
#[inline(always)]
- pub const fn pin_in(x: T, alloc: A) -> Pin<Self>
+ pub fn pin_in(x: T, alloc: A) -> Pin<Self>
where
- A: 'static + ~const Allocator + ~const Destruct,
+ A: 'static + Allocator,
{
Self::into_pin(Self::new_in(x, alloc))
}
@@ -592,8 +580,7 @@ impl<T, A: Allocator> Box<T, A> {
///
/// This conversion does not allocate on the heap and happens in place.
#[unstable(feature = "box_into_boxed_slice", issue = "71582")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
- pub const fn into_boxed_slice(boxed: Self) -> Box<[T], A> {
+ pub fn into_boxed_slice(boxed: Self) -> Box<[T], A> {
let (raw, alloc) = Box::into_raw_with_allocator(boxed);
unsafe { Box::from_raw_in(raw as *mut [T; 1], alloc) }
}
@@ -610,12 +597,8 @@ impl<T, A: Allocator> Box<T, A> {
/// assert_eq!(Box::into_inner(c), 5);
/// ```
#[unstable(feature = "box_into_inner", issue = "80437")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[inline]
- pub const fn into_inner(boxed: Self) -> T
- where
- Self: ~const Destruct,
- {
+ pub fn into_inner(boxed: Self) -> T {
*boxed
}
}
@@ -829,9 +812,8 @@ impl<T, A: Allocator> Box<mem::MaybeUninit<T>, A> {
/// assert_eq!(*five, 5)
/// ```
#[unstable(feature = "new_uninit", issue = "63291")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[inline]
- pub const unsafe fn assume_init(self) -> Box<T, A> {
+ pub unsafe fn assume_init(self) -> Box<T, A> {
let (raw, alloc) = Box::into_raw_with_allocator(self);
unsafe { Box::from_raw_in(raw as *mut T, alloc) }
}
@@ -864,9 +846,8 @@ impl<T, A: Allocator> Box<mem::MaybeUninit<T>, A> {
/// }
/// ```
#[unstable(feature = "new_uninit", issue = "63291")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[inline]
- pub const fn write(mut boxed: Self, value: T) -> Box<T, A> {
+ pub fn write(mut boxed: Self, value: T) -> Box<T, A> {
unsafe {
(*boxed).write(value);
boxed.assume_init()
@@ -1110,9 +1091,8 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
///
/// [memory layout]: self#memory-layout
#[unstable(feature = "allocator_api", issue = "32838")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[inline]
- pub const fn into_raw_with_allocator(b: Self) -> (*mut T, A) {
+ pub fn into_raw_with_allocator(b: Self) -> (*mut T, A) {
let (leaked, alloc) = Box::into_unique(b);
(leaked.as_ptr(), alloc)
}
@@ -1122,10 +1102,9 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
issue = "none",
reason = "use `Box::leak(b).into()` or `Unique::from(Box::leak(b))` instead"
)]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[inline]
#[doc(hidden)]
- pub const fn into_unique(b: Self) -> (Unique<T>, A) {
+ pub fn into_unique(b: Self) -> (Unique<T>, A) {
// Box is recognized as a "unique pointer" by Stacked Borrows, but internally it is a
// raw pointer for the type system. Turning it directly into a raw pointer would not be
// recognized as "releasing" the unique pointer to permit aliased raw accesses,
@@ -1183,9 +1162,8 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
/// assert_eq!(*static_ref, [4, 2, 3]);
/// ```
#[stable(feature = "box_leak", since = "1.26.0")]
- #[rustc_const_unstable(feature = "const_box", issue = "92521")]
#[inline]
- pub const fn leak<'a>(b: Self) -> &'a mut T
+ pub fn leak<'a>(b: Self) -> &'a mut T
where
A: 'a,
{
@@ -1246,16 +1224,16 @@ unsafe impl<#[may_dangle] T: ?Sized, A: Allocator> Drop for Box<T, A> {
#[stable(feature = "rust1", since = "1.0.0")]
impl<T: Default> Default for Box<T> {
/// Creates a `Box<T>`, with the `Default` value for T.
+ #[inline]
fn default() -> Self {
- #[rustc_box]
Box::new(T::default())
}
}
#[cfg(not(no_global_oom_handling))]
#[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_const_unstable(feature = "const_default_impls", issue = "87864")]
-impl<T> const Default for Box<[T]> {
+impl<T> Default for Box<[T]> {
+ #[inline]
fn default() -> Self {
let ptr: Unique<[T]> = Unique::<[T; 0]>::dangling();
Box(ptr, Global)
@@ -1264,8 +1242,8 @@ impl<T> const Default for Box<[T]> {
#[cfg(not(no_global_oom_handling))]
#[stable(feature = "default_box_extra", since = "1.17.0")]
-#[rustc_const_unstable(feature = "const_default_impls", issue = "87864")]
-impl const Default for Box<str> {
+impl Default for Box<str> {
+ #[inline]
fn default() -> Self {
// SAFETY: This is the same as `Unique::cast<U>` but with an unsized `U = str`.
let ptr: Unique<str> = unsafe {
@@ -1461,8 +1439,7 @@ impl<T> From<T> for Box<T> {
}
#[stable(feature = "pin", since = "1.33.0")]
-#[rustc_const_unstable(feature = "const_box", issue = "92521")]
-impl<T: ?Sized, A: Allocator> const From<Box<T, A>> for Pin<Box<T, A>>
+impl<T: ?Sized, A: Allocator> From<Box<T, A>> for Pin<Box<T, A>>
where
A: 'static,
{
@@ -1482,9 +1459,36 @@ where
}
}
+/// Specialization trait used for `From<&[T]>`.
+#[cfg(not(no_global_oom_handling))]
+trait BoxFromSlice<T> {
+ fn from_slice(slice: &[T]) -> Self;
+}
+
+#[cfg(not(no_global_oom_handling))]
+impl<T: Clone> BoxFromSlice<T> for Box<[T]> {
+ #[inline]
+ default fn from_slice(slice: &[T]) -> Self {
+ slice.to_vec().into_boxed_slice()
+ }
+}
+
+#[cfg(not(no_global_oom_handling))]
+impl<T: Copy> BoxFromSlice<T> for Box<[T]> {
+ #[inline]
+ fn from_slice(slice: &[T]) -> Self {
+ let len = slice.len();
+ let buf = RawVec::with_capacity(len);
+ unsafe {
+ ptr::copy_nonoverlapping(slice.as_ptr(), buf.ptr(), len);
+ buf.into_box(slice.len()).assume_init()
+ }
+ }
+}
+
#[cfg(not(no_global_oom_handling))]
#[stable(feature = "box_from_slice", since = "1.17.0")]
-impl<T: Copy> From<&[T]> for Box<[T]> {
+impl<T: Clone> From<&[T]> for Box<[T]> {
/// Converts a `&[T]` into a `Box<[T]>`
///
/// This conversion allocates on the heap
@@ -1498,19 +1502,15 @@ impl<T: Copy> From<&[T]> for Box<[T]> {
///
/// println!("{boxed_slice:?}");
/// ```
+ #[inline]
fn from(slice: &[T]) -> Box<[T]> {
- let len = slice.len();
- let buf = RawVec::with_capacity(len);
- unsafe {
- ptr::copy_nonoverlapping(slice.as_ptr(), buf.ptr(), len);
- buf.into_box(slice.len()).assume_init()
- }
+ <Self as BoxFromSlice<T>>::from_slice(slice)
}
}
#[cfg(not(no_global_oom_handling))]
#[stable(feature = "box_from_cow", since = "1.45.0")]
-impl<T: Copy> From<Cow<'_, [T]>> for Box<[T]> {
+impl<T: Clone> From<Cow<'_, [T]>> for Box<[T]> {
/// Converts a `Cow<'_, [T]>` into a `Box<[T]>`
///
/// When `cow` is the `Cow::Borrowed` variant, this
@@ -1620,7 +1620,6 @@ impl<T, const N: usize> From<[T; N]> for Box<[T]> {
/// println!("{boxed:?}");
/// ```
fn from(array: [T; N]) -> Box<[T]> {
- #[rustc_box]
Box::new(array)
}
}
@@ -1899,8 +1898,7 @@ impl<T: ?Sized, A: Allocator> fmt::Pointer for Box<T, A> {
}
#[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_const_unstable(feature = "const_box", issue = "92521")]
-impl<T: ?Sized, A: Allocator> const Deref for Box<T, A> {
+impl<T: ?Sized, A: Allocator> Deref for Box<T, A> {
type Target = T;
fn deref(&self) -> &T {
@@ -1909,8 +1907,7 @@ impl<T: ?Sized, A: Allocator> const Deref for Box<T, A> {
}
#[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_const_unstable(feature = "const_box", issue = "92521")]
-impl<T: ?Sized, A: Allocator> const DerefMut for Box<T, A> {
+impl<T: ?Sized, A: Allocator> DerefMut for Box<T, A> {
fn deref_mut(&mut self) -> &mut T {
&mut **self
}
diff --git a/rust/alloc/lib.rs b/rust/alloc/lib.rs
index 5f374378b0d4..85e91356ecb3 100644
--- a/rust/alloc/lib.rs
+++ b/rust/alloc/lib.rs
@@ -89,35 +89,37 @@
#![warn(missing_debug_implementations)]
#![warn(missing_docs)]
#![allow(explicit_outlives_requirements)]
+#![warn(multiple_supertrait_upcastable)]
//
// Library features:
+// tidy-alphabetical-start
+#![cfg_attr(not(no_global_oom_handling), feature(const_alloc_error))]
+#![cfg_attr(not(no_global_oom_handling), feature(const_btree_len))]
+#![cfg_attr(test, feature(is_sorted))]
+#![cfg_attr(test, feature(new_uninit))]
#![feature(alloc_layout_extra)]
#![feature(allocator_api)]
#![feature(array_chunks)]
#![feature(array_into_iter_constructors)]
#![feature(array_methods)]
#![feature(array_windows)]
+#![feature(ascii_char)]
#![feature(assert_matches)]
#![feature(async_iterator)]
#![feature(coerce_unsized)]
-#![cfg_attr(not(no_global_oom_handling), feature(const_alloc_error))]
+#![feature(const_align_of_val)]
#![feature(const_box)]
-#![cfg_attr(not(no_global_oom_handling), feature(const_btree_len))]
#![cfg_attr(not(no_borrow), feature(const_cow_is_borrowed))]
-#![feature(const_convert)]
-#![feature(const_size_of_val)]
-#![feature(const_align_of_val)]
-#![feature(const_ptr_read)]
-#![feature(const_maybe_uninit_zeroed)]
-#![feature(const_maybe_uninit_write)]
+#![feature(const_eval_select)]
#![feature(const_maybe_uninit_as_mut_ptr)]
+#![feature(const_maybe_uninit_write)]
+#![feature(const_maybe_uninit_zeroed)]
+#![feature(const_pin)]
#![feature(const_refs_to_cell)]
+#![feature(const_size_of_val)]
+#![feature(const_waker)]
#![feature(core_intrinsics)]
#![feature(core_panic)]
-#![feature(const_eval_select)]
-#![feature(const_pin)]
-#![feature(const_waker)]
-#![feature(cstr_from_bytes_until_nul)]
#![feature(dispatch_from_dyn)]
#![feature(error_generic_member_access)]
#![feature(error_in_core)]
@@ -128,7 +130,6 @@
#![feature(hasher_prefixfree_extras)]
#![feature(inline_const)]
#![feature(inplace_iteration)]
-#![cfg_attr(test, feature(is_sorted))]
#![feature(iter_advance_by)]
#![feature(iter_next_chunk)]
#![feature(iter_repeat_n)]
@@ -136,8 +137,6 @@
#![feature(maybe_uninit_slice)]
#![feature(maybe_uninit_uninit_array)]
#![feature(maybe_uninit_uninit_array_transpose)]
-#![cfg_attr(test, feature(new_uninit))]
-#![feature(nonnull_slice_from_raw_parts)]
#![feature(pattern)]
#![feature(pointer_byte_offsets)]
#![feature(provide_any)]
@@ -153,6 +152,7 @@
#![feature(slice_ptr_get)]
#![feature(slice_ptr_len)]
#![feature(slice_range)]
+#![feature(std_internals)]
#![feature(str_internals)]
#![feature(strict_provenance)]
#![feature(trusted_len)]
@@ -163,40 +163,42 @@
#![feature(unicode_internals)]
#![feature(unsize)]
#![feature(utf8_chunks)]
-#![feature(std_internals)]
+// tidy-alphabetical-end
//
// Language features:
+// tidy-alphabetical-start
+#![cfg_attr(not(test), feature(generator_trait))]
+#![cfg_attr(test, feature(panic_update_hook))]
+#![cfg_attr(test, feature(test))]
#![feature(allocator_internals)]
#![feature(allow_internal_unstable)]
#![feature(associated_type_bounds)]
+#![feature(c_unwind)]
#![feature(cfg_sanitize)]
-#![feature(const_deref)]
#![feature(const_mut_refs)]
-#![feature(const_ptr_write)]
#![feature(const_precise_live_drops)]
+#![feature(const_ptr_write)]
#![feature(const_trait_impl)]
#![feature(const_try)]
#![feature(dropck_eyepatch)]
#![feature(exclusive_range_pattern)]
#![feature(fundamental)]
-#![cfg_attr(not(test), feature(generator_trait))]
#![feature(hashmap_internals)]
#![feature(lang_items)]
#![feature(min_specialization)]
+#![feature(multiple_supertrait_upcastable)]
#![feature(negative_impls)]
#![feature(never_type)]
+#![feature(pointer_is_aligned)]
#![feature(rustc_allow_const_fn_unstable)]
#![feature(rustc_attrs)]
-#![feature(pointer_is_aligned)]
#![feature(slice_internals)]
#![feature(staged_api)]
#![feature(stmt_expr_attributes)]
-#![cfg_attr(test, feature(test))]
#![feature(unboxed_closures)]
#![feature(unsized_fn_params)]
-#![feature(c_unwind)]
#![feature(with_negative_coherence)]
-#![cfg_attr(test, feature(panic_update_hook))]
+// tidy-alphabetical-end
//
// Rustdoc features:
#![feature(doc_cfg)]
diff --git a/rust/alloc/raw_vec.rs b/rust/alloc/raw_vec.rs
index 5db87eac53b7..65d5ce15828e 100644
--- a/rust/alloc/raw_vec.rs
+++ b/rust/alloc/raw_vec.rs
@@ -6,7 +6,6 @@ use core::alloc::LayoutError;
use core::cmp;
use core::intrinsics;
use core::mem::{self, ManuallyDrop, MaybeUninit, SizedTypeProperties};
-use core::ops::Drop;
use core::ptr::{self, NonNull, Unique};
use core::slice;
@@ -274,10 +273,15 @@ impl<T, A: Allocator> RawVec<T, A> {
if T::IS_ZST || self.cap == 0 {
None
} else {
- // We have an allocated chunk of memory, so we can bypass runtime
- // checks to get our current layout.
+ // We could use Layout::array here which ensures the absence of isize and usize overflows
+ // and could hypothetically handle differences between stride and size, but this memory
+ // has already been allocated so we know it can't overflow and currently rust does not
+ // support such types. So we can do better by skipping some checks and avoid an unwrap.
+ let _: () = const { assert!(mem::size_of::<T>() % mem::align_of::<T>() == 0) };
unsafe {
- let layout = Layout::array::<T>(self.cap).unwrap_unchecked();
+ let align = mem::align_of::<T>();
+ let size = mem::size_of::<T>().unchecked_mul(self.cap);
+ let layout = Layout::from_size_align_unchecked(size, align);
Some((self.ptr.cast().into(), layout))
}
}
@@ -465,11 +469,13 @@ impl<T, A: Allocator> RawVec<T, A> {
assert!(cap <= self.capacity(), "Tried to shrink to a larger capacity");
let (ptr, layout) = if let Some(mem) = self.current_memory() { mem } else { return Ok(()) };
-
+ // See current_memory() why this assert is here
+ let _: () = const { assert!(mem::size_of::<T>() % mem::align_of::<T>() == 0) };
let ptr = unsafe {
// `Layout::array` cannot overflow here because it would have
// overflowed earlier when capacity was larger.
- let new_layout = Layout::array::<T>(cap).unwrap_unchecked();
+ let new_size = mem::size_of::<T>().unchecked_mul(cap);
+ let new_layout = Layout::from_size_align_unchecked(new_size, layout.align());
self.alloc
.shrink(ptr, layout, new_layout)
.map_err(|_| AllocError { layout: new_layout, non_exhaustive: () })?
diff --git a/rust/alloc/slice.rs b/rust/alloc/slice.rs
index 245e01590df7..6ac463bd3edc 100644
--- a/rust/alloc/slice.rs
+++ b/rust/alloc/slice.rs
@@ -784,6 +784,38 @@ impl<T, A: Allocator> BorrowMut<[T]> for Vec<T, A> {
}
}
+// Specializable trait for implementing ToOwned::clone_into. This is
+// public in the crate and has the Allocator parameter so that
+// vec::clone_from use it too.
+#[cfg(not(no_global_oom_handling))]
+pub(crate) trait SpecCloneIntoVec<T, A: Allocator> {
+ fn clone_into(&self, target: &mut Vec<T, A>);
+}
+
+#[cfg(not(no_global_oom_handling))]
+impl<T: Clone, A: Allocator> SpecCloneIntoVec<T, A> for [T] {
+ default fn clone_into(&self, target: &mut Vec<T, A>) {
+ // drop anything in target that will not be overwritten
+ target.truncate(self.len());
+
+ // target.len <= self.len due to the truncate above, so the
+ // slices here are always in-bounds.
+ let (init, tail) = self.split_at(target.len());
+
+ // reuse the contained values' allocations/resources.
+ target.clone_from_slice(init);
+ target.extend_from_slice(tail);
+ }
+}
+
+#[cfg(not(no_global_oom_handling))]
+impl<T: Copy, A: Allocator> SpecCloneIntoVec<T, A> for [T] {
+ fn clone_into(&self, target: &mut Vec<T, A>) {
+ target.clear();
+ target.extend_from_slice(self);
+ }
+}
+
#[cfg(not(no_global_oom_handling))]
#[stable(feature = "rust1", since = "1.0.0")]
impl<T: Clone> ToOwned for [T] {
@@ -799,16 +831,7 @@ impl<T: Clone> ToOwned for [T] {
}
fn clone_into(&self, target: &mut Vec<T>) {
- // drop anything in target that will not be overwritten
- target.truncate(self.len());
-
- // target.len <= self.len due to the truncate above, so the
- // slices here are always in-bounds.
- let (init, tail) = self.split_at(target.len());
-
- // reuse the contained values' allocations/resources.
- target.clone_from_slice(init);
- target.extend_from_slice(tail);
+ SpecCloneIntoVec::clone_into(self, target);
}
}
diff --git a/rust/alloc/vec/drain.rs b/rust/alloc/vec/drain.rs
index d503d2f478ce..78177a9e2ad0 100644
--- a/rust/alloc/vec/drain.rs
+++ b/rust/alloc/vec/drain.rs
@@ -18,7 +18,7 @@ use super::Vec;
///
/// ```
/// let mut v = vec![0, 1, 2];
-/// let iter: std::vec::Drain<_> = v.drain(..);
+/// let iter: std::vec::Drain<'_, _> = v.drain(..);
/// ```
#[stable(feature = "drain", since = "1.6.0")]
pub struct Drain<
@@ -114,9 +114,7 @@ impl<'a, T, A: Allocator> Drain<'a, T, A> {
let unyielded_ptr = this.iter.as_slice().as_ptr();
// ZSTs have no identity, so we don't need to move them around.
- let needs_move = mem::size_of::<T>() != 0;
-
- if needs_move {
+ if !T::IS_ZST {
let start_ptr = source_vec.as_mut_ptr().add(start);
// memmove back unyielded elements
@@ -199,7 +197,7 @@ impl<T, A: Allocator> Drop for Drain<'_, T, A> {
}
}
- let iter = mem::replace(&mut self.iter, (&mut []).iter());
+ let iter = mem::take(&mut self.iter);
let drop_len = iter.len();
let mut vec = self.vec;
diff --git a/rust/alloc/vec/drain_filter.rs b/rust/alloc/vec/drain_filter.rs
index 4b019220657d..09efff090e42 100644
--- a/rust/alloc/vec/drain_filter.rs
+++ b/rust/alloc/vec/drain_filter.rs
@@ -1,7 +1,7 @@
// SPDX-License-Identifier: Apache-2.0 OR MIT
use crate::alloc::{Allocator, Global};
-use core::mem::{self, ManuallyDrop};
+use core::mem::{ManuallyDrop, SizedTypeProperties};
use core::ptr;
use core::slice;
@@ -18,7 +18,7 @@ use super::Vec;
/// #![feature(drain_filter)]
///
/// let mut v = vec![0, 1, 2];
-/// let iter: std::vec::DrainFilter<_, _> = v.drain_filter(|x| *x % 2 == 0);
+/// let iter: std::vec::DrainFilter<'_, _, _> = v.drain_filter(|x| *x % 2 == 0);
/// ```
#[unstable(feature = "drain_filter", reason = "recently added", issue = "43244")]
#[derive(Debug)]
@@ -98,9 +98,7 @@ where
unsafe {
// ZSTs have no identity, so we don't need to move them around.
- let needs_move = mem::size_of::<T>() != 0;
-
- if needs_move && this.idx < this.old_len && this.del > 0 {
+ if !T::IS_ZST && this.idx < this.old_len && this.del > 0 {
let ptr = this.vec.as_mut_ptr();
let src = ptr.add(this.idx);
let dst = src.sub(this.del);
diff --git a/rust/alloc/vec/into_iter.rs b/rust/alloc/vec/into_iter.rs
index 34a2a70d6ded..aac0ec16aef1 100644
--- a/rust/alloc/vec/into_iter.rs
+++ b/rust/alloc/vec/into_iter.rs
@@ -13,6 +13,7 @@ use core::iter::{
};
use core::marker::PhantomData;
use core::mem::{self, ManuallyDrop, MaybeUninit, SizedTypeProperties};
+use core::num::NonZeroUsize;
#[cfg(not(no_global_oom_handling))]
use core::ops::Deref;
use core::ptr::{self, NonNull};
@@ -109,7 +110,7 @@ impl<T, A: Allocator> IntoIter<T, A> {
/// ```
/// # let mut into_iter = Vec::<u8>::with_capacity(10).into_iter();
/// let mut into_iter = std::mem::replace(&mut into_iter, Vec::new().into_iter());
- /// (&mut into_iter).for_each(core::mem::drop);
+ /// (&mut into_iter).for_each(drop);
/// std::mem::forget(into_iter);
/// ```
///
@@ -215,7 +216,7 @@ impl<T, A: Allocator> Iterator for IntoIter<T, A> {
}
#[inline]
- fn advance_by(&mut self, n: usize) -> Result<(), usize> {
+ fn advance_by(&mut self, n: usize) -> Result<(), NonZeroUsize> {
let step_size = self.len().min(n);
let to_drop = ptr::slice_from_raw_parts_mut(self.ptr as *mut T, step_size);
if T::IS_ZST {
@@ -229,10 +230,7 @@ impl<T, A: Allocator> Iterator for IntoIter<T, A> {
unsafe {
ptr::drop_in_place(to_drop);
}
- if step_size < n {
- return Err(step_size);
- }
- Ok(())
+ NonZeroUsize::new(n - step_size).map_or(Ok(()), Err)
}
#[inline]
@@ -315,7 +313,7 @@ impl<T, A: Allocator> DoubleEndedIterator for IntoIter<T, A> {
}
#[inline]
- fn advance_back_by(&mut self, n: usize) -> Result<(), usize> {
+ fn advance_back_by(&mut self, n: usize) -> Result<(), NonZeroUsize> {
let step_size = self.len().min(n);
if T::IS_ZST {
// SAFETY: same as for advance_by()
@@ -329,10 +327,7 @@ impl<T, A: Allocator> DoubleEndedIterator for IntoIter<T, A> {
unsafe {
ptr::drop_in_place(to_drop);
}
- if step_size < n {
- return Err(step_size);
- }
- Ok(())
+ NonZeroUsize::new(n - step_size).map_or(Ok(()), Err)
}
}
@@ -349,6 +344,24 @@ impl<T, A: Allocator> FusedIterator for IntoIter<T, A> {}
#[unstable(feature = "trusted_len", issue = "37572")]
unsafe impl<T, A: Allocator> TrustedLen for IntoIter<T, A> {}
+#[stable(feature = "default_iters", since = "1.70.0")]
+impl<T, A> Default for IntoIter<T, A>
+where
+ A: Allocator + Default,
+{
+ /// Creates an empty `vec::IntoIter`.
+ ///
+ /// ```
+ /// # use std::vec;
+ /// let iter: vec::IntoIter<u8> = Default::default();
+ /// assert_eq!(iter.len(), 0);
+ /// assert_eq!(iter.as_slice(), &[]);
+ /// ```
+ fn default() -> Self {
+ super::Vec::new_in(Default::default()).into_iter()
+ }
+}
+
#[doc(hidden)]
#[unstable(issue = "none", feature = "std_internals")]
#[rustc_unsafe_specialization_marker]
diff --git a/rust/alloc/vec/mod.rs b/rust/alloc/vec/mod.rs
index 94995913566b..05c70de0227e 100644
--- a/rust/alloc/vec/mod.rs
+++ b/rust/alloc/vec/mod.rs
@@ -58,13 +58,9 @@
#[cfg(not(no_global_oom_handling))]
use core::cmp;
use core::cmp::Ordering;
-use core::convert::TryFrom;
use core::fmt;
use core::hash::{Hash, Hasher};
-use core::intrinsics::assume;
use core::iter;
-#[cfg(not(no_global_oom_handling))]
-use core::iter::FromIterator;
use core::marker::PhantomData;
use core::mem::{self, ManuallyDrop, MaybeUninit, SizedTypeProperties};
use core::ops::{self, Index, IndexMut, Range, RangeBounds};
@@ -381,8 +377,8 @@ mod spec_extend;
/// Currently, `Vec` does not guarantee the order in which elements are dropped.
/// The order has changed in the past and may change again.
///
-/// [`get`]: ../../std/vec/struct.Vec.html#method.get
-/// [`get_mut`]: ../../std/vec/struct.Vec.html#method.get_mut
+/// [`get`]: slice::get
+/// [`get_mut`]: slice::get_mut
/// [`String`]: crate::string::String
/// [`&str`]: type@str
/// [`shrink_to_fit`]: Vec::shrink_to_fit
@@ -708,14 +704,14 @@ impl<T, A: Allocator> Vec<T, A> {
///
/// // The vector contains no items, even though it has capacity for more
/// assert_eq!(vec.len(), 0);
- /// assert_eq!(vec.capacity(), 10);
+ /// assert!(vec.capacity() >= 10);
///
/// // These are all done without reallocating...
/// for i in 0..10 {
/// vec.push(i);
/// }
/// assert_eq!(vec.len(), 10);
- /// assert_eq!(vec.capacity(), 10);
+ /// assert!(vec.capacity() >= 10);
///
/// // ...but this may make the vector reallocate
/// vec.push(11);
@@ -766,14 +762,14 @@ impl<T, A: Allocator> Vec<T, A> {
///
/// // The vector contains no items, even though it has capacity for more
/// assert_eq!(vec.len(), 0);
- /// assert_eq!(vec.capacity(), 10);
+ /// assert!(vec.capacity() >= 10);
///
/// // These are all done without reallocating...
/// for i in 0..10 {
/// vec.push(i);
/// }
/// assert_eq!(vec.len(), 10);
- /// assert_eq!(vec.capacity(), 10);
+ /// assert!(vec.capacity() >= 10);
///
/// // ...but this may make the vector reallocate
/// vec.push(11);
@@ -999,7 +995,7 @@ impl<T, A: Allocator> Vec<T, A> {
/// ```
/// let mut vec: Vec<i32> = Vec::with_capacity(10);
/// vec.push(42);
- /// assert_eq!(vec.capacity(), 10);
+ /// assert!(vec.capacity() >= 10);
/// ```
#[inline]
#[stable(feature = "rust1", since = "1.0.0")]
@@ -1150,7 +1146,7 @@ impl<T, A: Allocator> Vec<T, A> {
/// ```
/// let mut vec = Vec::with_capacity(10);
/// vec.extend([1, 2, 3]);
- /// assert_eq!(vec.capacity(), 10);
+ /// assert!(vec.capacity() >= 10);
/// vec.shrink_to_fit();
/// assert!(vec.capacity() >= 3);
/// ```
@@ -1177,7 +1173,7 @@ impl<T, A: Allocator> Vec<T, A> {
/// ```
/// let mut vec = Vec::with_capacity(10);
/// vec.extend([1, 2, 3]);
- /// assert_eq!(vec.capacity(), 10);
+ /// assert!(vec.capacity() >= 10);
/// vec.shrink_to(4);
/// assert!(vec.capacity() >= 4);
/// vec.shrink_to(0);
@@ -1212,7 +1208,7 @@ impl<T, A: Allocator> Vec<T, A> {
/// let mut vec = Vec::with_capacity(10);
/// vec.extend([1, 2, 3]);
///
- /// assert_eq!(vec.capacity(), 10);
+ /// assert!(vec.capacity() >= 10);
/// let slice = vec.into_boxed_slice();
/// assert_eq!(slice.into_vec().capacity(), 3);
/// ```
@@ -1358,11 +1354,7 @@ impl<T, A: Allocator> Vec<T, A> {
pub fn as_ptr(&self) -> *const T {
// We shadow the slice method of the same name to avoid going through
// `deref`, which creates an intermediate reference.
- let ptr = self.buf.ptr();
- unsafe {
- assume(!ptr.is_null());
- }
- ptr
+ self.buf.ptr()
}
/// Returns an unsafe mutable pointer to the vector's buffer, or a dangling
@@ -1395,11 +1387,7 @@ impl<T, A: Allocator> Vec<T, A> {
pub fn as_mut_ptr(&mut self) -> *mut T {
// We shadow the slice method of the same name to avoid going through
// `deref_mut`, which creates an intermediate reference.
- let ptr = self.buf.ptr();
- unsafe {
- assume(!ptr.is_null());
- }
- ptr
+ self.buf.ptr()
}
/// Returns a reference to the underlying allocator.
@@ -2892,35 +2880,6 @@ impl<T, A: Allocator> ops::DerefMut for Vec<T, A> {
}
#[cfg(not(no_global_oom_handling))]
-trait SpecCloneFrom {
- fn clone_from(this: &mut Self, other: &Self);
-}
-
-#[cfg(not(no_global_oom_handling))]
-impl<T: Clone, A: Allocator> SpecCloneFrom for Vec<T, A> {
- default fn clone_from(this: &mut Self, other: &Self) {
- // drop anything that will not be overwritten
- this.truncate(other.len());
-
- // self.len <= other.len due to the truncate above, so the
- // slices here are always in-bounds.
- let (init, tail) = other.split_at(this.len());
-
- // reuse the contained values' allocations/resources.
- this.clone_from_slice(init);
- this.extend_from_slice(tail);
- }
-}
-
-#[cfg(not(no_global_oom_handling))]
-impl<T: Copy, A: Allocator> SpecCloneFrom for Vec<T, A> {
- fn clone_from(this: &mut Self, other: &Self) {
- this.clear();
- this.extend_from_slice(other);
- }
-}
-
-#[cfg(not(no_global_oom_handling))]
#[stable(feature = "rust1", since = "1.0.0")]
impl<T: Clone, A: Allocator + Clone> Clone for Vec<T, A> {
#[cfg(not(test))]
@@ -2940,7 +2899,7 @@ impl<T: Clone, A: Allocator + Clone> Clone for Vec<T, A> {
}
fn clone_from(&mut self, other: &Self) {
- SpecCloneFrom::clone_from(self, other)
+ crate::slice::SpecCloneIntoVec::clone_into(other.as_slice(), self);
}
}
@@ -2948,7 +2907,6 @@ impl<T: Clone, A: Allocator + Clone> Clone for Vec<T, A> {
/// as required by the `core::borrow::Borrow` implementation.
///
/// ```
-/// #![feature(build_hasher_simple_hash_one)]
/// use std::hash::BuildHasher;
///
/// let b = std::collections::hash_map::RandomState::new();
@@ -3330,7 +3288,7 @@ impl<'a, T: Copy + 'a, A: Allocator + 'a> Extend<&'a T> for Vec<T, A> {
}
}
-/// Implements comparison of vectors, [lexicographically](core::cmp::Ord#lexicographical-comparison).
+/// Implements comparison of vectors, [lexicographically](Ord#lexicographical-comparison).
#[stable(feature = "rust1", since = "1.0.0")]
impl<T: PartialOrd, A: Allocator> PartialOrd for Vec<T, A> {
#[inline]
@@ -3342,7 +3300,7 @@ impl<T: PartialOrd, A: Allocator> PartialOrd for Vec<T, A> {
#[stable(feature = "rust1", since = "1.0.0")]
impl<T: Eq, A: Allocator> Eq for Vec<T, A> {}
-/// Implements ordering of vectors, [lexicographically](core::cmp::Ord#lexicographical-comparison).
+/// Implements ordering of vectors, [lexicographically](Ord#lexicographical-comparison).
#[stable(feature = "rust1", since = "1.0.0")]
impl<T: Ord, A: Allocator> Ord for Vec<T, A> {
#[inline]
@@ -3365,8 +3323,7 @@ unsafe impl<#[may_dangle] T, A: Allocator> Drop for Vec<T, A> {
}
#[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_const_unstable(feature = "const_default_impls", issue = "87864")]
-impl<T> const Default for Vec<T> {
+impl<T> Default for Vec<T> {
/// Creates an empty `Vec<T>`.
///
/// The vector will not allocate until elements are pushed onto it.
@@ -3462,10 +3419,7 @@ impl<T, const N: usize> From<[T; N]> for Vec<T> {
/// ```
#[cfg(not(test))]
fn from(s: [T; N]) -> Vec<T> {
- <[T]>::into_vec(
- #[rustc_box]
- Box::new(s),
- )
+ <[T]>::into_vec(Box::new(s))
}
#[cfg(test)]
@@ -3490,8 +3444,8 @@ where
///
/// ```
/// # use std::borrow::Cow;
- /// let o: Cow<[i32]> = Cow::Owned(vec![1, 2, 3]);
- /// let b: Cow<[i32]> = Cow::Borrowed(&[1, 2, 3]);
+ /// let o: Cow<'_, [i32]> = Cow::Owned(vec![1, 2, 3]);
+ /// let b: Cow<'_, [i32]> = Cow::Borrowed(&[1, 2, 3]);
/// assert_eq!(Vec::from(o), Vec::from(b));
/// ```
fn from(s: Cow<'a, [T]>) -> Vec<T> {
diff --git a/rust/compiler_builtins.rs b/rust/compiler_builtins.rs
index 43378357ece9..fb8ac3f211de 100644
--- a/rust/compiler_builtins.rs
+++ b/rust/compiler_builtins.rs
@@ -37,14 +37,21 @@ macro_rules! define_panicking_intrinsics(
);
define_panicking_intrinsics!("`f32` should not be used", {
+ __addsf3,
__eqsf2,
__gesf2,
__lesf2,
+ __ltsf2,
+ __mulsf3,
__nesf2,
__unordsf2,
});
define_panicking_intrinsics!("`f64` should not be used", {
+ __adddf3,
+ __ledf2,
+ __ltdf2,
+ __muldf3,
__unorddf2,
});
diff --git a/rust/kernel/allocator.rs b/rust/kernel/allocator.rs
index 72d66c23883c..a8f3d5be1af1 100644
--- a/rust/kernel/allocator.rs
+++ b/rust/kernel/allocator.rs
@@ -83,53 +83,6 @@ unsafe impl GlobalAlloc for KernelAllocator {
#[global_allocator]
static ALLOCATOR: KernelAllocator = KernelAllocator;
-// `rustc` only generates these for some crate types. Even then, we would need
-// to extract the object file that has them from the archive. For the moment,
-// let's generate them ourselves instead.
-//
-// Note: Although these are *safe* functions, they are called by the compiler
-// with parameters that obey the same `GlobalAlloc` function safety
-// requirements: size and align should form a valid layout, and size is
-// greater than 0.
-//
-// Note that `#[no_mangle]` implies exported too, nowadays.
+// See <https://github.com/rust-lang/rust/pull/86844>.
#[no_mangle]
-fn __rust_alloc(size: usize, align: usize) -> *mut u8 {
- // SAFETY: See assumption above.
- let layout = unsafe { Layout::from_size_align_unchecked(size, align) };
-
- // SAFETY: `ptr::null_mut()` is null, per assumption above the size of `layout` is greater
- // than 0.
- unsafe { krealloc_aligned(ptr::null_mut(), layout, bindings::GFP_KERNEL) }
-}
-
-#[no_mangle]
-fn __rust_dealloc(ptr: *mut u8, _size: usize, _align: usize) {
- unsafe { bindings::kfree(ptr as *const core::ffi::c_void) };
-}
-
-#[no_mangle]
-fn __rust_realloc(ptr: *mut u8, _old_size: usize, align: usize, new_size: usize) -> *mut u8 {
- // SAFETY: See assumption above.
- let new_layout = unsafe { Layout::from_size_align_unchecked(new_size, align) };
-
- // SAFETY: Per assumption above, `ptr` is allocated by `__rust_*` before, and the size of
- // `new_layout` is greater than 0.
- unsafe { krealloc_aligned(ptr, new_layout, bindings::GFP_KERNEL) }
-}
-
-#[no_mangle]
-fn __rust_alloc_zeroed(size: usize, align: usize) -> *mut u8 {
- // SAFETY: See assumption above.
- let layout = unsafe { Layout::from_size_align_unchecked(size, align) };
-
- // SAFETY: `ptr::null_mut()` is null, per assumption above the size of `layout` is greater
- // than 0.
- unsafe {
- krealloc_aligned(
- ptr::null_mut(),
- layout,
- bindings::GFP_KERNEL | bindings::__GFP_ZERO,
- )
- }
-}
+static __rust_no_alloc_shim_is_unstable: u8 = 0;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-04 02:21:03 +0000