diff --git a/Documentation/process/changes.rst b/Documentation/process/changes.rst index 2f21a1cf7c0e4..4697e77b63217 100644 --- a/Documentation/process/changes.rst +++ b/Documentation/process/changes.rst @@ -31,7 +31,7 @@ you probably needn't concern yourself with pcmciautils. ====================== =============== ======================================== GNU C 5.1 gcc --version Clang/LLVM (optional) 11.0.0 clang --version -Rust (optional) 1.68.2 rustc --version +Rust (optional) 1.71.0 rustc --version bindgen (optional) 0.56.0 bindgen --version GNU make 3.82 make --version bash 4.2 bash --version diff --git a/rust/Makefile b/rust/Makefile index 657b1b6f3d269..a9df9a6c02760 100644 --- a/rust/Makefile +++ b/rust/Makefile @@ -378,8 +378,8 @@ rust-analyzer: $(RUST_LIB_SRC) > $(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 acf22d45e6f26..0b6bf5b6da434 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(Unique, A)`, // this function has to be changed to `fn box_free(Unique, A)` as well. -pub(crate) const unsafe fn box_free( - ptr: Unique, - alloc: A, -) { +pub(crate) unsafe fn box_free(ptr: Unique, 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 14af9860c36cd..c8173cea83177 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 Box { #[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 Box { #[must_use] #[inline(always)] pub fn pin(x: T) -> Pin> { - (#[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 Box { /// ``` #[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 Box { /// # 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 + pub fn try_new_in(x: T, alloc: A) -> Result 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 Box { /// 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, A> + pub fn new_uninit_in(alloc: A) -> Box, A> where - A: ~const Allocator + ~const Destruct, + A: Allocator, { let layout = Layout::new::>(); // NOTE: Prefer match over unwrap_or_else since closure sometimes not inlineable. @@ -487,10 +479,9 @@ impl Box { /// ``` #[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, A>, AllocError> + pub fn try_new_uninit_in(alloc: A) -> Result, A>, AllocError> where - A: ~const Allocator + ~const Destruct, + A: Allocator, { let layout = Layout::new::>(); let ptr = alloc.allocate(layout)?.cast(); @@ -518,13 +509,12 @@ impl Box { /// /// [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, A> + pub fn new_zeroed_in(alloc: A) -> Box, A> where - A: ~const Allocator + ~const Destruct, + A: Allocator, { let layout = Layout::new::>(); // NOTE: Prefer match over unwrap_or_else since closure sometimes not inlineable. @@ -559,10 +549,9 @@ impl Box { /// [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, A>, AllocError> + pub fn try_new_zeroed_in(alloc: A) -> Result, A>, AllocError> where - A: ~const Allocator + ~const Destruct, + A: Allocator, { let layout = Layout::new::>(); let ptr = alloc.allocate_zeroed(layout)?.cast(); @@ -578,12 +567,11 @@ impl Box { /// 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 + pub fn pin_in(x: T, alloc: A) -> Pin where - A: 'static + ~const Allocator + ~const Destruct, + A: 'static + Allocator, { Self::into_pin(Self::new_in(x, alloc)) } @@ -592,8 +580,7 @@ impl Box { /// /// 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 Box { /// 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 Box, 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 { + pub unsafe fn assume_init(self) -> Box { let (raw, alloc) = Box::into_raw_with_allocator(self); unsafe { Box::from_raw_in(raw as *mut T, alloc) } } @@ -864,9 +846,8 @@ impl Box, 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 { + pub fn write(mut boxed: Self, value: T) -> Box { unsafe { (*boxed).write(value); boxed.assume_init() @@ -1110,9 +1091,8 @@ impl Box { /// /// [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 Box { 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, A) { + pub fn into_unique(b: Self) -> (Unique, 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 Box { /// 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 { #[stable(feature = "rust1", since = "1.0.0")] impl Default for Box { /// Creates a `Box`, 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 const Default for Box<[T]> { +impl Default for Box<[T]> { + #[inline] fn default() -> Self { let ptr: Unique<[T]> = Unique::<[T; 0]>::dangling(); Box(ptr, Global) @@ -1264,8 +1242,8 @@ impl 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 { +impl Default for Box { + #[inline] fn default() -> Self { // SAFETY: This is the same as `Unique::cast` but with an unsized `U = str`. let ptr: Unique = unsafe { @@ -1461,8 +1439,7 @@ impl From for Box { } #[stable(feature = "pin", since = "1.33.0")] -#[rustc_const_unstable(feature = "const_box", issue = "92521")] -impl const From> for Pin> +impl From> for Pin> where A: 'static, { @@ -1482,9 +1459,36 @@ where } } +/// Specialization trait used for `From<&[T]>`. +#[cfg(not(no_global_oom_handling))] +trait BoxFromSlice { + fn from_slice(slice: &[T]) -> Self; +} + +#[cfg(not(no_global_oom_handling))] +impl BoxFromSlice for Box<[T]> { + #[inline] + default fn from_slice(slice: &[T]) -> Self { + slice.to_vec().into_boxed_slice() + } +} + +#[cfg(not(no_global_oom_handling))] +impl BoxFromSlice 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 From<&[T]> for Box<[T]> { +impl From<&[T]> for Box<[T]> { /// Converts a `&[T]` into a `Box<[T]>` /// /// This conversion allocates on the heap @@ -1498,19 +1502,15 @@ impl 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() - } + >::from_slice(slice) } } #[cfg(not(no_global_oom_handling))] #[stable(feature = "box_from_cow", since = "1.45.0")] -impl From> for Box<[T]> { +impl From> for Box<[T]> { /// Converts a `Cow<'_, [T]>` into a `Box<[T]>` /// /// When `cow` is the `Cow::Borrowed` variant, this @@ -1620,7 +1620,6 @@ impl 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 fmt::Pointer for Box { } #[stable(feature = "rust1", since = "1.0.0")] -#[rustc_const_unstable(feature = "const_box", issue = "92521")] -impl const Deref for Box { +impl Deref for Box { type Target = T; fn deref(&self) -> &T { @@ -1909,8 +1907,7 @@ impl const Deref for Box { } #[stable(feature = "rust1", since = "1.0.0")] -#[rustc_const_unstable(feature = "const_box", issue = "92521")] -impl const DerefMut for Box { +impl DerefMut for Box { fn deref_mut(&mut self) -> &mut T { &mut **self } diff --git a/rust/alloc/lib.rs b/rust/alloc/lib.rs index 5f374378b0d49..85e91356ecb30 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 5db87eac53b78..65d5ce15828e4 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 RawVec { 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::() % mem::align_of::() == 0) }; unsafe { - let layout = Layout::array::(self.cap).unwrap_unchecked(); + let align = mem::align_of::(); + let size = mem::size_of::().unchecked_mul(self.cap); + let layout = Layout::from_size_align_unchecked(size, align); Some((self.ptr.cast().into(), layout)) } } @@ -465,11 +469,13 @@ impl RawVec { 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::() % mem::align_of::() == 0) }; let ptr = unsafe { // `Layout::array` cannot overflow here because it would have // overflowed earlier when capacity was larger. - let new_layout = Layout::array::(cap).unwrap_unchecked(); + let new_size = mem::size_of::().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 245e01590df72..6ac463bd3edc5 100644 --- a/rust/alloc/slice.rs +++ b/rust/alloc/slice.rs @@ -784,6 +784,38 @@ impl BorrowMut<[T]> for Vec { } } +// 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 { + fn clone_into(&self, target: &mut Vec); +} + +#[cfg(not(no_global_oom_handling))] +impl SpecCloneIntoVec for [T] { + default fn clone_into(&self, target: &mut Vec) { + // 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 SpecCloneIntoVec for [T] { + fn clone_into(&self, target: &mut Vec) { + target.clear(); + target.extend_from_slice(self); + } +} + #[cfg(not(no_global_oom_handling))] #[stable(feature = "rust1", since = "1.0.0")] impl ToOwned for [T] { @@ -799,16 +831,7 @@ impl ToOwned for [T] { } fn clone_into(&self, target: &mut Vec) { - // 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 d503d2f478ce7..78177a9e2ad0c 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::() != 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 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 4b019220657df..09efff090e428 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::() != 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 34a2a70d6ded3..aac0ec16aef15 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 IntoIter { /// ``` /// # let mut into_iter = Vec::::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 Iterator for IntoIter { } #[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 Iterator for IntoIter { 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 DoubleEndedIterator for IntoIter { } #[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 DoubleEndedIterator for IntoIter { 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 FusedIterator for IntoIter {} #[unstable(feature = "trusted_len", issue = "37572")] unsafe impl TrustedLen for IntoIter {} +#[stable(feature = "default_iters", since = "1.70.0")] +impl Default for IntoIter +where + A: Allocator + Default, +{ + /// Creates an empty `vec::IntoIter`. + /// + /// ``` + /// # use std::vec; + /// let iter: vec::IntoIter = 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 94995913566bb..05c70de0227ed 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 Vec { /// /// // 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 Vec { /// /// // 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 Vec { /// ``` /// let mut vec: Vec = 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 Vec { /// ``` /// 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 Vec { /// ``` /// 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 Vec { /// 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 Vec { 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 Vec { 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. @@ -2891,35 +2879,6 @@ impl ops::DerefMut for Vec { } } -#[cfg(not(no_global_oom_handling))] -trait SpecCloneFrom { - fn clone_from(this: &mut Self, other: &Self); -} - -#[cfg(not(no_global_oom_handling))] -impl SpecCloneFrom for Vec { - 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 SpecCloneFrom for Vec { - 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 Clone for Vec { @@ -2940,7 +2899,7 @@ impl Clone for Vec { } 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 Clone for Vec { /// 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 { } } -/// 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 PartialOrd for Vec { #[inline] @@ -3342,7 +3300,7 @@ impl PartialOrd for Vec { #[stable(feature = "rust1", since = "1.0.0")] impl Eq for Vec {} -/// 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 Ord for Vec { #[inline] @@ -3365,8 +3323,7 @@ unsafe impl<#[may_dangle] T, A: Allocator> Drop for Vec { } #[stable(feature = "rust1", since = "1.0.0")] -#[rustc_const_unstable(feature = "const_default_impls", issue = "87864")] -impl const Default for Vec { +impl Default for Vec { /// Creates an empty `Vec`. /// /// The vector will not allocate until elements are pushed onto it. @@ -3462,10 +3419,7 @@ impl From<[T; N]> for Vec { /// ``` #[cfg(not(test))] fn from(s: [T; N]) -> Vec { - <[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 { diff --git a/rust/compiler_builtins.rs b/rust/compiler_builtins.rs index 43378357ece99..fb8ac3f211de5 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 397a3dd57a9b1..cfb406e2a7102 100644 --- a/rust/kernel/allocator.rs +++ b/rust/kernel/allocator.rs @@ -26,39 +26,6 @@ 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 that `#[no_mangle]` implies exported too, nowadays. +// See . #[no_mangle] -fn __rust_alloc(size: usize, _align: usize) -> *mut u8 { - unsafe { bindings::krealloc(core::ptr::null(), size, bindings::GFP_KERNEL) as *mut u8 } -} - -#[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 { - unsafe { - bindings::krealloc( - ptr as *const core::ffi::c_void, - new_size, - bindings::GFP_KERNEL, - ) as *mut u8 - } -} - -#[no_mangle] -fn __rust_alloc_zeroed(size: usize, _align: usize) -> *mut u8 { - unsafe { - bindings::krealloc( - core::ptr::null(), - size, - bindings::GFP_KERNEL | bindings::__GFP_ZERO, - ) as *mut u8 - } -} +static __rust_no_alloc_shim_is_unstable: u8 = 0; diff --git a/scripts/min-tool-version.sh b/scripts/min-tool-version.sh index 131be76d21305..ffcd3941859d4 100755 --- a/scripts/min-tool-version.sh +++ b/scripts/min-tool-version.sh @@ -27,7 +27,7 @@ llvm) fi ;; rustc) - echo 1.68.2 + echo 1.71.0 ;; bindgen) echo 0.56.0