diff options
Diffstat (limited to 'library')
93 files changed, 1887 insertions, 1776 deletions
diff --git a/library/alloc/src/collections/btree/map.rs b/library/alloc/src/collections/btree/map.rs index 8b6d86a2888..98f11e2ea57 100644 --- a/library/alloc/src/collections/btree/map.rs +++ b/library/alloc/src/collections/btree/map.rs @@ -1433,7 +1433,6 @@ impl<K, V, A: Allocator + Clone> BTreeMap<K, V, A> { /// # Examples /// /// ``` - /// #![feature(btree_extract_if)] /// use std::collections::BTreeMap; /// /// // Splitting a map into even and odd keys, reusing the original map: @@ -1450,7 +1449,7 @@ impl<K, V, A: Allocator + Clone> BTreeMap<K, V, A> { /// assert_eq!(low.keys().copied().collect::<Vec<_>>(), [0, 1, 2, 3]); /// assert_eq!(high.keys().copied().collect::<Vec<_>>(), [4, 5, 6, 7]); /// ``` - #[unstable(feature = "btree_extract_if", issue = "70530")] + #[stable(feature = "btree_extract_if", since = "CURRENT_RUSTC_VERSION")] pub fn extract_if<F, R>(&mut self, range: R, pred: F) -> ExtractIf<'_, K, V, R, F, A> where K: Ord, @@ -1937,7 +1936,7 @@ impl<K, V> Default for Values<'_, K, V> { } /// An iterator produced by calling `extract_if` on BTreeMap. -#[unstable(feature = "btree_extract_if", issue = "70530")] +#[stable(feature = "btree_extract_if", since = "CURRENT_RUSTC_VERSION")] #[must_use = "iterators are lazy and do nothing unless consumed"] pub struct ExtractIf< 'a, @@ -1970,7 +1969,7 @@ pub(super) struct ExtractIfInner<'a, K, V, R> { range: R, } -#[unstable(feature = "btree_extract_if", issue = "70530")] +#[stable(feature = "btree_extract_if", since = "CURRENT_RUSTC_VERSION")] impl<K, V, R, F, A> fmt::Debug for ExtractIf<'_, K, V, R, F, A> where K: fmt::Debug, @@ -1982,7 +1981,7 @@ where } } -#[unstable(feature = "btree_extract_if", issue = "70530")] +#[stable(feature = "btree_extract_if", since = "CURRENT_RUSTC_VERSION")] impl<K, V, R, F, A: Allocator + Clone> Iterator for ExtractIf<'_, K, V, R, F, A> where K: PartialOrd, @@ -2056,7 +2055,7 @@ impl<'a, K, V, R> ExtractIfInner<'a, K, V, R> { } } -#[unstable(feature = "btree_extract_if", issue = "70530")] +#[stable(feature = "btree_extract_if", since = "CURRENT_RUSTC_VERSION")] impl<K, V, R, F> FusedIterator for ExtractIf<'_, K, V, R, F> where K: PartialOrd, diff --git a/library/alloc/src/collections/btree/set.rs b/library/alloc/src/collections/btree/set.rs index d50ce02bda7..e6b0a1f6323 100644 --- a/library/alloc/src/collections/btree/set.rs +++ b/library/alloc/src/collections/btree/set.rs @@ -1202,7 +1202,6 @@ impl<T, A: Allocator + Clone> BTreeSet<T, A> { /// # Examples /// /// ``` - /// #![feature(btree_extract_if)] /// use std::collections::BTreeSet; /// /// // Splitting a set into even and odd values, reusing the original set: @@ -1219,7 +1218,7 @@ impl<T, A: Allocator + Clone> BTreeSet<T, A> { /// assert_eq!(low.into_iter().collect::<Vec<_>>(), [0, 1, 2, 3]); /// assert_eq!(high.into_iter().collect::<Vec<_>>(), [4, 5, 6, 7]); /// ``` - #[unstable(feature = "btree_extract_if", issue = "70530")] + #[stable(feature = "btree_extract_if", since = "CURRENT_RUSTC_VERSION")] pub fn extract_if<F, R>(&mut self, range: R, pred: F) -> ExtractIf<'_, T, R, F, A> where T: Ord, @@ -1554,7 +1553,7 @@ impl<'a, T, A: Allocator + Clone> IntoIterator for &'a BTreeSet<T, A> { } /// An iterator produced by calling `extract_if` on BTreeSet. -#[unstable(feature = "btree_extract_if", issue = "70530")] +#[stable(feature = "btree_extract_if", since = "CURRENT_RUSTC_VERSION")] #[must_use = "iterators are lazy and do nothing unless consumed"] pub struct ExtractIf< 'a, @@ -1569,7 +1568,7 @@ pub struct ExtractIf< alloc: A, } -#[unstable(feature = "btree_extract_if", issue = "70530")] +#[stable(feature = "btree_extract_if", since = "CURRENT_RUSTC_VERSION")] impl<T, R, F, A> fmt::Debug for ExtractIf<'_, T, R, F, A> where T: fmt::Debug, @@ -1582,7 +1581,7 @@ where } } -#[unstable(feature = "btree_extract_if", issue = "70530")] +#[stable(feature = "btree_extract_if", since = "CURRENT_RUSTC_VERSION")] impl<T, R, F, A: Allocator + Clone> Iterator for ExtractIf<'_, T, R, F, A> where T: PartialOrd, @@ -1602,7 +1601,7 @@ where } } -#[unstable(feature = "btree_extract_if", issue = "70530")] +#[stable(feature = "btree_extract_if", since = "CURRENT_RUSTC_VERSION")] impl<T, R, F, A: Allocator + Clone> FusedIterator for ExtractIf<'_, T, R, F, A> where T: PartialOrd, diff --git a/library/alloctests/benches/lib.rs b/library/alloctests/benches/lib.rs index 2633154318c..721d685527f 100644 --- a/library/alloctests/benches/lib.rs +++ b/library/alloctests/benches/lib.rs @@ -1,6 +1,5 @@ // Disabling in Miri as these would take too long. #![cfg(not(miri))] -#![feature(btree_extract_if)] #![feature(iter_next_chunk)] #![feature(repr_simd)] #![feature(slice_partition_dedup)] diff --git a/library/alloctests/tests/lib.rs b/library/alloctests/tests/lib.rs index bf446ae1ba4..8c3ce156f3c 100644 --- a/library/alloctests/tests/lib.rs +++ b/library/alloctests/tests/lib.rs @@ -2,7 +2,6 @@ #![feature(alloc_layout_extra)] #![feature(iter_array_chunks)] #![feature(assert_matches)] -#![feature(btree_extract_if)] #![feature(wtf8_internals)] #![feature(char_max_len)] #![feature(cow_is_borrowed)] diff --git a/library/core/src/any.rs b/library/core/src/any.rs index e7d9763d46e..76ea2d18a82 100644 --- a/library/core/src/any.rs +++ b/library/core/src/any.rs @@ -705,7 +705,8 @@ impl dyn Any + Send + Sync { /// std::mem::forget(fake_one_ring); /// } /// ``` -#[derive(Clone, Copy, Eq, PartialOrd, Ord)] +#[derive(Copy, PartialOrd, Ord)] +#[derive_const(Clone, Eq)] #[stable(feature = "rust1", since = "1.0.0")] #[lang = "type_id"] pub struct TypeId { diff --git a/library/core/src/array/equality.rs b/library/core/src/array/equality.rs index 1ad2cca64a3..c2c7ccf0daa 100644 --- a/library/core/src/array/equality.rs +++ b/library/core/src/array/equality.rs @@ -1,9 +1,10 @@ use crate::cmp::BytewiseEq; #[stable(feature = "rust1", since = "1.0.0")] -impl<T, U, const N: usize> PartialEq<[U; N]> for [T; N] +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl<T, U, const N: usize> const PartialEq<[U; N]> for [T; N] where - T: PartialEq<U>, + T: [const] PartialEq<U>, { #[inline] fn eq(&self, other: &[U; N]) -> bool { @@ -16,9 +17,10 @@ where } #[stable(feature = "rust1", since = "1.0.0")] -impl<T, U, const N: usize> PartialEq<[U]> for [T; N] +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl<T, U, const N: usize> const PartialEq<[U]> for [T; N] where - T: PartialEq<U>, + T: [const] PartialEq<U>, { #[inline] fn eq(&self, other: &[U]) -> bool { @@ -37,9 +39,10 @@ where } #[stable(feature = "rust1", since = "1.0.0")] -impl<T, U, const N: usize> PartialEq<[U; N]> for [T] +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl<T, U, const N: usize> const PartialEq<[U; N]> for [T] where - T: PartialEq<U>, + T: [const] PartialEq<U>, { #[inline] fn eq(&self, other: &[U; N]) -> bool { @@ -58,9 +61,10 @@ where } #[stable(feature = "rust1", since = "1.0.0")] -impl<T, U, const N: usize> PartialEq<&[U]> for [T; N] +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl<T, U, const N: usize> const PartialEq<&[U]> for [T; N] where - T: PartialEq<U>, + T: [const] PartialEq<U>, { #[inline] fn eq(&self, other: &&[U]) -> bool { @@ -73,9 +77,10 @@ where } #[stable(feature = "rust1", since = "1.0.0")] -impl<T, U, const N: usize> PartialEq<[U; N]> for &[T] +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl<T, U, const N: usize> const PartialEq<[U; N]> for &[T] where - T: PartialEq<U>, + T: [const] PartialEq<U>, { #[inline] fn eq(&self, other: &[U; N]) -> bool { @@ -88,9 +93,10 @@ where } #[stable(feature = "rust1", since = "1.0.0")] -impl<T, U, const N: usize> PartialEq<&mut [U]> for [T; N] +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl<T, U, const N: usize> const PartialEq<&mut [U]> for [T; N] where - T: PartialEq<U>, + T: [const] PartialEq<U>, { #[inline] fn eq(&self, other: &&mut [U]) -> bool { @@ -103,9 +109,10 @@ where } #[stable(feature = "rust1", since = "1.0.0")] -impl<T, U, const N: usize> PartialEq<[U; N]> for &mut [T] +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl<T, U, const N: usize> const PartialEq<[U; N]> for &mut [T] where - T: PartialEq<U>, + T: [const] PartialEq<U>, { #[inline] fn eq(&self, other: &[U; N]) -> bool { @@ -122,14 +129,18 @@ where // __impl_slice_eq2! { [A; $N], &'b mut [B; $N] } #[stable(feature = "rust1", since = "1.0.0")] -impl<T: Eq, const N: usize> Eq for [T; N] {} +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl<T: [const] Eq, const N: usize> const Eq for [T; N] {} +#[const_trait] +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] trait SpecArrayEq<Other, const N: usize>: Sized { fn spec_eq(a: &[Self; N], b: &[Other; N]) -> bool; fn spec_ne(a: &[Self; N], b: &[Other; N]) -> bool; } -impl<T: PartialEq<Other>, Other, const N: usize> SpecArrayEq<Other, N> for T { +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl<T: [const] PartialEq<Other>, Other, const N: usize> const SpecArrayEq<Other, N> for T { default fn spec_eq(a: &[Self; N], b: &[Other; N]) -> bool { a[..] == b[..] } @@ -138,7 +149,8 @@ impl<T: PartialEq<Other>, Other, const N: usize> SpecArrayEq<Other, N> for T { } } -impl<T: BytewiseEq<U>, U, const N: usize> SpecArrayEq<U, N> for T { +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl<T: [const] BytewiseEq<U>, U, const N: usize> const SpecArrayEq<U, N> for T { fn spec_eq(a: &[T; N], b: &[U; N]) -> bool { // SAFETY: Arrays are compared element-wise, and don't add any padding // between elements, so when the elements are `BytewiseEq`, we can diff --git a/library/core/src/ascii/ascii_char.rs b/library/core/src/ascii/ascii_char.rs index 49d540314a2..178af2c0e3b 100644 --- a/library/core/src/ascii/ascii_char.rs +++ b/library/core/src/ascii/ascii_char.rs @@ -54,7 +54,8 @@ use crate::{assert_unsafe_precondition, fmt}; /// [chart]: https://www.unicode.org/charts/PDF/U0000.pdf /// [NIST FIPS 1-2]: https://nvlpubs.nist.gov/nistpubs/Legacy/FIPS/fipspub1-2-1977.pdf /// [NamesList]: https://www.unicode.org/Public/15.0.0/ucd/NamesList.txt -#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)] +#[derive(Copy, Hash)] +#[derive_const(Clone, Eq, PartialEq, Ord, PartialOrd)] #[unstable(feature = "ascii_char", issue = "110998")] #[repr(u8)] pub enum AsciiChar { diff --git a/library/core/src/cmp.rs b/library/core/src/cmp.rs index 0812322f3fb..94536f25b41 100644 --- a/library/core/src/cmp.rs +++ b/library/core/src/cmp.rs @@ -29,7 +29,7 @@ mod bytewise; pub(crate) use bytewise::BytewiseEq; use self::Ordering::*; -use crate::marker::PointeeSized; +use crate::marker::{Destruct, PointeeSized}; use crate::ops::ControlFlow; /// Trait for comparisons using the equality operator. @@ -334,7 +334,9 @@ pub macro PartialEq($item:item) { #[doc(alias = "!=")] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_diagnostic_item = "Eq"] -pub trait Eq: PartialEq<Self> + PointeeSized { +#[const_trait] +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +pub trait Eq: [const] PartialEq<Self> + PointeeSized { // this method is used solely by `impl Eq or #[derive(Eq)]` to assert that every component of a // type implements `Eq` itself. The current deriving infrastructure means doing this assertion // without using a method on this trait is nearly impossible. @@ -380,8 +382,8 @@ pub struct AssertParamIsEq<T: Eq + PointeeSized> { /// /// assert_eq!(2.cmp(&1), Ordering::Greater); /// ``` -#[derive(Clone, Copy, Eq, PartialOrd, Ord, Debug, Hash)] -#[derive_const(PartialEq)] +#[derive(Copy, Debug, Hash)] +#[derive_const(Clone, Eq, PartialOrd, Ord, PartialEq)] #[stable(feature = "rust1", since = "1.0.0")] // This is a lang item only so that `BinOp::Cmp` in MIR can return it. // It has no special behavior, but does require that the three variants @@ -635,7 +637,11 @@ impl Ordering { #[inline] #[must_use] #[stable(feature = "ordering_chaining", since = "1.17.0")] - pub fn then_with<F: FnOnce() -> Ordering>(self, f: F) -> Ordering { + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + pub const fn then_with<F>(self, f: F) -> Ordering + where + F: [const] FnOnce() -> Ordering + [const] Destruct, + { match self { Equal => f(), _ => self, @@ -659,13 +665,15 @@ impl Ordering { /// v.sort_by_key(|&num| (num > 3, Reverse(num))); /// assert_eq!(v, vec![3, 2, 1, 6, 5, 4]); /// ``` -#[derive(PartialEq, Eq, Debug, Copy, Default, Hash)] +#[derive(Copy, Debug, Hash)] +#[derive_const(PartialEq, Eq, Default)] #[stable(feature = "reverse_cmp_key", since = "1.19.0")] #[repr(transparent)] pub struct Reverse<T>(#[stable(feature = "reverse_cmp_key", since = "1.19.0")] pub T); #[stable(feature = "reverse_cmp_key", since = "1.19.0")] -impl<T: PartialOrd> PartialOrd for Reverse<T> { +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl<T: [const] PartialOrd> const PartialOrd for Reverse<T> { #[inline] fn partial_cmp(&self, other: &Reverse<T>) -> Option<Ordering> { other.0.partial_cmp(&self.0) @@ -690,7 +698,8 @@ impl<T: PartialOrd> PartialOrd for Reverse<T> { } #[stable(feature = "reverse_cmp_key", since = "1.19.0")] -impl<T: Ord> Ord for Reverse<T> { +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl<T: [const] Ord> const Ord for Reverse<T> { #[inline] fn cmp(&self, other: &Reverse<T>) -> Ordering { other.0.cmp(&self.0) @@ -957,7 +966,9 @@ impl<T: Clone> Clone for Reverse<T> { #[doc(alias = ">=")] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_diagnostic_item = "Ord"] -pub trait Ord: Eq + PartialOrd<Self> + PointeeSized { +#[const_trait] +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +pub trait Ord: [const] Eq + [const] PartialOrd<Self> + PointeeSized { /// This method returns an [`Ordering`] between `self` and `other`. /// /// By convention, `self.cmp(&other)` returns the ordering matching the expression @@ -1011,7 +1022,7 @@ pub trait Ord: Eq + PartialOrd<Self> + PointeeSized { #[rustc_diagnostic_item = "cmp_ord_max"] fn max(self, other: Self) -> Self where - Self: Sized, + Self: Sized + [const] Destruct, { if other < self { self } else { other } } @@ -1050,7 +1061,7 @@ pub trait Ord: Eq + PartialOrd<Self> + PointeeSized { #[rustc_diagnostic_item = "cmp_ord_min"] fn min(self, other: Self) -> Self where - Self: Sized, + Self: Sized + [const] Destruct, { if other < self { other } else { self } } @@ -1076,7 +1087,7 @@ pub trait Ord: Eq + PartialOrd<Self> + PointeeSized { #[stable(feature = "clamp", since = "1.50.0")] fn clamp(self, min: Self, max: Self) -> Self where - Self: Sized, + Self: Sized + [const] Destruct, { assert!(min <= max); if self < min { @@ -1341,6 +1352,8 @@ pub macro Ord($item:item) { )] #[rustc_diagnostic_item = "PartialOrd"] #[allow(multiple_supertrait_upcastable)] // FIXME(sized_hierarchy): remove this +#[const_trait] +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] pub trait PartialOrd<Rhs: PointeeSized = Self>: PartialEq<Rhs> + PointeeSized { /// This method returns an ordering between `self` and `other` values if one exists. /// @@ -1481,13 +1494,14 @@ pub trait PartialOrd<Rhs: PointeeSized = Self>: PartialEq<Rhs> + PointeeSized { } } -fn default_chaining_impl<T, U>( +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +const fn default_chaining_impl<T, U>( lhs: &T, rhs: &U, - p: impl FnOnce(Ordering) -> bool, + p: impl [const] FnOnce(Ordering) -> bool + [const] Destruct, ) -> ControlFlow<bool> where - T: PartialOrd<U> + PointeeSized, + T: [const] PartialOrd<U> + PointeeSized, U: PointeeSized, { // It's important that this only call `partial_cmp` once, not call `eq` then @@ -1545,7 +1559,8 @@ pub macro PartialOrd($item:item) { #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_diagnostic_item = "cmp_min"] -pub fn min<T: Ord>(v1: T, v2: T) -> T { +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +pub const fn min<T: [const] Ord + [const] Destruct>(v1: T, v2: T) -> T { v1.min(v2) } @@ -1575,7 +1590,12 @@ pub fn min<T: Ord>(v1: T, v2: T) -> T { #[inline] #[must_use] #[stable(feature = "cmp_min_max_by", since = "1.53.0")] -pub fn min_by<T, F: FnOnce(&T, &T) -> Ordering>(v1: T, v2: T, compare: F) -> T { +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +pub const fn min_by<T: [const] Destruct, F: [const] FnOnce(&T, &T) -> Ordering>( + v1: T, + v2: T, + compare: F, +) -> T { if compare(&v1, &v2).is_le() { v1 } else { v2 } } @@ -1600,7 +1620,13 @@ pub fn min_by<T, F: FnOnce(&T, &T) -> Ordering>(v1: T, v2: T, compare: F) -> T { #[inline] #[must_use] #[stable(feature = "cmp_min_max_by", since = "1.53.0")] -pub fn min_by_key<T, F: FnMut(&T) -> K, K: Ord>(v1: T, v2: T, mut f: F) -> T { +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +pub const fn min_by_key<T, F, K>(v1: T, v2: T, mut f: F) -> T +where + T: [const] Destruct, + F: [const] FnMut(&T) -> K + [const] Destruct, + K: [const] Ord + [const] Destruct, +{ if f(&v2) < f(&v1) { v2 } else { v1 } } @@ -1640,7 +1666,8 @@ pub fn min_by_key<T, F: FnMut(&T) -> K, K: Ord>(v1: T, v2: T, mut f: F) -> T { #[must_use] #[stable(feature = "rust1", since = "1.0.0")] #[rustc_diagnostic_item = "cmp_max"] -pub fn max<T: Ord>(v1: T, v2: T) -> T { +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +pub const fn max<T: [const] Ord + [const] Destruct>(v1: T, v2: T) -> T { v1.max(v2) } @@ -1670,7 +1697,12 @@ pub fn max<T: Ord>(v1: T, v2: T) -> T { #[inline] #[must_use] #[stable(feature = "cmp_min_max_by", since = "1.53.0")] -pub fn max_by<T, F: FnOnce(&T, &T) -> Ordering>(v1: T, v2: T, compare: F) -> T { +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +pub const fn max_by<T: [const] Destruct, F: [const] FnOnce(&T, &T) -> Ordering>( + v1: T, + v2: T, + compare: F, +) -> T { if compare(&v1, &v2).is_gt() { v1 } else { v2 } } @@ -1695,7 +1727,13 @@ pub fn max_by<T, F: FnOnce(&T, &T) -> Ordering>(v1: T, v2: T, compare: F) -> T { #[inline] #[must_use] #[stable(feature = "cmp_min_max_by", since = "1.53.0")] -pub fn max_by_key<T, F: FnMut(&T) -> K, K: Ord>(v1: T, v2: T, mut f: F) -> T { +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +pub const fn max_by_key<T, F, K>(v1: T, v2: T, mut f: F) -> T +where + T: [const] Destruct, + F: [const] FnMut(&T) -> K + [const] Destruct, + K: [const] Ord + [const] Destruct, +{ if f(&v2) < f(&v1) { v1 } else { v2 } } @@ -1739,9 +1777,10 @@ pub fn max_by_key<T, F: FnMut(&T) -> K, K: Ord>(v1: T, v2: T, mut f: F) -> T { #[inline] #[must_use] #[unstable(feature = "cmp_minmax", issue = "115939")] -pub fn minmax<T>(v1: T, v2: T) -> [T; 2] +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +pub const fn minmax<T>(v1: T, v2: T) -> [T; 2] where - T: Ord, + T: [const] Ord, { if v2 < v1 { [v2, v1] } else { [v1, v2] } } @@ -1773,9 +1812,10 @@ where #[inline] #[must_use] #[unstable(feature = "cmp_minmax", issue = "115939")] -pub fn minmax_by<T, F>(v1: T, v2: T, compare: F) -> [T; 2] +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +pub const fn minmax_by<T, F>(v1: T, v2: T, compare: F) -> [T; 2] where - F: FnOnce(&T, &T) -> Ordering, + F: [const] FnOnce(&T, &T) -> Ordering, { if compare(&v1, &v2).is_le() { [v1, v2] } else { [v2, v1] } } @@ -1801,10 +1841,11 @@ where #[inline] #[must_use] #[unstable(feature = "cmp_minmax", issue = "115939")] -pub fn minmax_by_key<T, F, K>(v1: T, v2: T, mut f: F) -> [T; 2] +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +pub const fn minmax_by_key<T, F, K>(v1: T, v2: T, mut f: F) -> [T; 2] where - F: FnMut(&T) -> K, - K: Ord, + F: [const] FnMut(&T) -> K + [const] Destruct, + K: [const] Ord + [const] Destruct, { if f(&v2) < f(&v1) { [v2, v1] } else { [v1, v2] } } @@ -1830,7 +1871,8 @@ mod impls { } #[stable(feature = "rust1", since = "1.0.0")] - impl PartialEq for () { + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl const PartialEq for () { #[inline] fn eq(&self, _other: &()) -> bool { true @@ -1848,7 +1890,8 @@ mod impls { macro_rules! eq_impl { ($($t:ty)*) => ($( #[stable(feature = "rust1", since = "1.0.0")] - impl Eq for $t {} + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl const Eq for $t {} )*) } @@ -1896,7 +1939,8 @@ mod impls { macro_rules! partial_ord_impl { ($($t:ty)*) => ($( #[stable(feature = "rust1", since = "1.0.0")] - impl PartialOrd for $t { + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl const PartialOrd for $t { #[inline] fn partial_cmp(&self, other: &Self) -> Option<Ordering> { match (*self <= *other, *self >= *other) { @@ -1913,7 +1957,8 @@ mod impls { } #[stable(feature = "rust1", since = "1.0.0")] - impl PartialOrd for () { + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl const PartialOrd for () { #[inline] fn partial_cmp(&self, _: &()) -> Option<Ordering> { Some(Equal) @@ -1921,7 +1966,8 @@ mod impls { } #[stable(feature = "rust1", since = "1.0.0")] - impl PartialOrd for bool { + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl const PartialOrd for bool { #[inline] fn partial_cmp(&self, other: &bool) -> Option<Ordering> { Some(self.cmp(other)) @@ -1935,7 +1981,8 @@ mod impls { macro_rules! ord_impl { ($($t:ty)*) => ($( #[stable(feature = "rust1", since = "1.0.0")] - impl PartialOrd for $t { + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl const PartialOrd for $t { #[inline] fn partial_cmp(&self, other: &Self) -> Option<Ordering> { Some(crate::intrinsics::three_way_compare(*self, *other)) @@ -1945,7 +1992,8 @@ mod impls { } #[stable(feature = "rust1", since = "1.0.0")] - impl Ord for $t { + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl const Ord for $t { #[inline] fn cmp(&self, other: &Self) -> Ordering { crate::intrinsics::three_way_compare(*self, *other) @@ -1955,7 +2003,8 @@ mod impls { } #[stable(feature = "rust1", since = "1.0.0")] - impl Ord for () { + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl const Ord for () { #[inline] fn cmp(&self, _other: &()) -> Ordering { Equal @@ -1963,7 +2012,8 @@ mod impls { } #[stable(feature = "rust1", since = "1.0.0")] - impl Ord for bool { + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl const Ord for bool { #[inline] fn cmp(&self, other: &bool) -> Ordering { // Casting to i8's and converting the difference to an Ordering generates @@ -1998,7 +2048,8 @@ mod impls { ord_impl! { char usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 } #[unstable(feature = "never_type", issue = "35121")] - impl PartialEq for ! { + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl const PartialEq for ! { #[inline] fn eq(&self, _: &!) -> bool { *self @@ -2006,10 +2057,12 @@ mod impls { } #[unstable(feature = "never_type", issue = "35121")] - impl Eq for ! {} + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl const Eq for ! {} #[unstable(feature = "never_type", issue = "35121")] - impl PartialOrd for ! { + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl const PartialOrd for ! { #[inline] fn partial_cmp(&self, _: &!) -> Option<Ordering> { *self @@ -2017,7 +2070,8 @@ mod impls { } #[unstable(feature = "never_type", issue = "35121")] - impl Ord for ! { + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl const Ord for ! { #[inline] fn cmp(&self, _: &!) -> Ordering { *self @@ -2042,9 +2096,10 @@ mod impls { } } #[stable(feature = "rust1", since = "1.0.0")] - impl<A: PointeeSized, B: PointeeSized> PartialOrd<&B> for &A + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl<A: PointeeSized, B: PointeeSized> const PartialOrd<&B> for &A where - A: PartialOrd<B>, + A: [const] PartialOrd<B>, { #[inline] fn partial_cmp(&self, other: &&B) -> Option<Ordering> { @@ -2084,9 +2139,10 @@ mod impls { } } #[stable(feature = "rust1", since = "1.0.0")] - impl<A: PointeeSized> Ord for &A + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl<A: PointeeSized> const Ord for &A where - A: Ord, + A: [const] Ord, { #[inline] fn cmp(&self, other: &Self) -> Ordering { @@ -2094,7 +2150,8 @@ mod impls { } } #[stable(feature = "rust1", since = "1.0.0")] - impl<A: PointeeSized> Eq for &A where A: Eq {} + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl<A: PointeeSized> const Eq for &A where A: [const] Eq {} // &mut pointers @@ -2114,9 +2171,10 @@ mod impls { } } #[stable(feature = "rust1", since = "1.0.0")] - impl<A: PointeeSized, B: PointeeSized> PartialOrd<&mut B> for &mut A + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl<A: PointeeSized, B: PointeeSized> const PartialOrd<&mut B> for &mut A where - A: PartialOrd<B>, + A: [const] PartialOrd<B>, { #[inline] fn partial_cmp(&self, other: &&mut B) -> Option<Ordering> { @@ -2156,9 +2214,10 @@ mod impls { } } #[stable(feature = "rust1", since = "1.0.0")] - impl<A: PointeeSized> Ord for &mut A + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl<A: PointeeSized> const Ord for &mut A where - A: Ord, + A: [const] Ord, { #[inline] fn cmp(&self, other: &Self) -> Ordering { @@ -2166,7 +2225,8 @@ mod impls { } } #[stable(feature = "rust1", since = "1.0.0")] - impl<A: PointeeSized> Eq for &mut A where A: Eq {} + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl<A: PointeeSized> const Eq for &mut A where A: [const] Eq {} #[stable(feature = "rust1", since = "1.0.0")] #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] diff --git a/library/core/src/convert/mod.rs b/library/core/src/convert/mod.rs index a3cfd85974a..89cda30c030 100644 --- a/library/core/src/convert/mod.rs +++ b/library/core/src/convert/mod.rs @@ -963,17 +963,20 @@ impl const PartialEq for Infallible { } #[stable(feature = "convert_infallible", since = "1.34.0")] -impl Eq for Infallible {} +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl const Eq for Infallible {} #[stable(feature = "convert_infallible", since = "1.34.0")] -impl PartialOrd for Infallible { +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl const PartialOrd for Infallible { fn partial_cmp(&self, _other: &Self) -> Option<crate::cmp::Ordering> { match *self {} } } #[stable(feature = "convert_infallible", since = "1.34.0")] -impl Ord for Infallible { +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl const Ord for Infallible { fn cmp(&self, _other: &Self) -> crate::cmp::Ordering { match *self {} } diff --git a/library/core/src/num/nonzero.rs b/library/core/src/num/nonzero.rs index 0f38081c355..1b7c28bb95a 100644 --- a/library/core/src/num/nonzero.rs +++ b/library/core/src/num/nonzero.rs @@ -4,7 +4,7 @@ use super::{IntErrorKind, ParseIntError}; use crate::clone::UseCloned; use crate::cmp::Ordering; use crate::hash::{Hash, Hasher}; -use crate::marker::{Freeze, StructuralPartialEq}; +use crate::marker::{Destruct, Freeze, StructuralPartialEq}; use crate::ops::{BitOr, BitOrAssign, Div, DivAssign, Neg, Rem, RemAssign}; use crate::panic::{RefUnwindSafe, UnwindSafe}; use crate::str::FromStr; @@ -220,12 +220,14 @@ where impl<T> StructuralPartialEq for NonZero<T> where T: ZeroablePrimitive + StructuralPartialEq {} #[stable(feature = "nonzero", since = "1.28.0")] -impl<T> Eq for NonZero<T> where T: ZeroablePrimitive + Eq {} +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl<T> const Eq for NonZero<T> where T: ZeroablePrimitive + [const] Eq {} #[stable(feature = "nonzero", since = "1.28.0")] -impl<T> PartialOrd for NonZero<T> +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl<T> const PartialOrd for NonZero<T> where - T: ZeroablePrimitive + PartialOrd, + T: ZeroablePrimitive + [const] PartialOrd, { #[inline] fn partial_cmp(&self, other: &Self) -> Option<Ordering> { @@ -254,9 +256,12 @@ where } #[stable(feature = "nonzero", since = "1.28.0")] -impl<T> Ord for NonZero<T> +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl<T> const Ord for NonZero<T> where - T: ZeroablePrimitive + Ord, + // FIXME(const_hack): the T: ~const Destruct should be inferred from the Self: ~const Destruct. + // See https://github.com/rust-lang/rust/issues/144207 + T: ZeroablePrimitive + [const] Ord + [const] Destruct, { #[inline] fn cmp(&self, other: &Self) -> Ordering { diff --git a/library/core/src/ops/control_flow.rs b/library/core/src/ops/control_flow.rs index 73b74d53323..b760a7c4e21 100644 --- a/library/core/src/ops/control_flow.rs +++ b/library/core/src/ops/control_flow.rs @@ -83,7 +83,8 @@ use crate::{convert, ops}; #[must_use] // ControlFlow should not implement PartialOrd or Ord, per RFC 3058: // https://rust-lang.github.io/rfcs/3058-try-trait-v2.html#traits-for-controlflow -#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)] +#[derive(Copy, Debug, Hash)] +#[derive_const(Clone, PartialEq, Eq)] pub enum ControlFlow<B, C = ()> { /// Move on to the next phase of the operation as normal. #[stable(feature = "control_flow_enum_type", since = "1.55.0")] diff --git a/library/core/src/option.rs b/library/core/src/option.rs index 198636c67d0..886d581b0a6 100644 --- a/library/core/src/option.rs +++ b/library/core/src/option.rs @@ -585,7 +585,8 @@ use crate::{cmp, convert, hint, mem, slice}; /// The `Option` type. See [the module level documentation](self) for more. #[doc(search_unbox)] -#[derive(Copy, Eq, Debug, Hash)] +#[derive(Copy, Debug, Hash)] +#[derive_const(Eq)] #[rustc_diagnostic_item = "Option"] #[lang = "Option"] #[stable(feature = "rust1", since = "1.0.0")] @@ -2363,7 +2364,8 @@ impl<T: [const] PartialEq> const PartialEq for Option<T> { // https://github.com/rust-lang/rust/issues/49892, although still // not optimal. #[stable(feature = "rust1", since = "1.0.0")] -impl<T: PartialOrd> PartialOrd for Option<T> { +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl<T: [const] PartialOrd> const PartialOrd for Option<T> { #[inline] fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> { match (self, other) { @@ -2376,7 +2378,8 @@ impl<T: PartialOrd> PartialOrd for Option<T> { } #[stable(feature = "rust1", since = "1.0.0")] -impl<T: Ord> Ord for Option<T> { +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl<T: [const] Ord> const Ord for Option<T> { #[inline] fn cmp(&self, other: &Self) -> cmp::Ordering { match (self, other) { diff --git a/library/core/src/ptr/const_ptr.rs b/library/core/src/ptr/const_ptr.rs index c5f0cb8016e..45109270944 100644 --- a/library/core/src/ptr/const_ptr.rs +++ b/library/core/src/ptr/const_ptr.rs @@ -146,28 +146,7 @@ impl<T: PointeeSized> *const T { self as _ } - /// Gets the "address" portion of the pointer. - /// - /// This is similar to `self as usize`, except that the [provenance][crate::ptr#provenance] of - /// the pointer is discarded and not [exposed][crate::ptr#exposed-provenance]. This means that - /// casting the returned address back to a pointer yields a [pointer without - /// provenance][without_provenance], which is undefined behavior to dereference. To properly - /// restore the lost information and obtain a dereferenceable pointer, use - /// [`with_addr`][pointer::with_addr] or [`map_addr`][pointer::map_addr]. - /// - /// If using those APIs is not possible because there is no way to preserve a pointer with the - /// required provenance, then Strict Provenance might not be for you. Use pointer-integer casts - /// or [`expose_provenance`][pointer::expose_provenance] and [`with_exposed_provenance`][with_exposed_provenance] - /// instead. However, note that this makes your code less portable and less amenable to tools - /// that check for compliance with the Rust memory model. - /// - /// On most platforms this will produce a value with the same bytes as the original - /// pointer, because all the bytes are dedicated to describing the address. - /// Platforms which need to store additional information in the pointer may - /// perform a change of representation to produce a value containing only the address - /// portion of the pointer. What that means is up to the platform to define. - /// - /// This is a [Strict Provenance][crate::ptr#strict-provenance] API. + #[doc = include_str!("./docs/addr.md")] #[must_use] #[inline(always)] #[stable(feature = "strict_provenance", since = "1.84.0")] @@ -254,23 +233,16 @@ impl<T: PointeeSized> *const T { (self.cast(), metadata(self)) } - /// Returns `None` if the pointer is null, or else returns a shared reference to - /// the value wrapped in `Some`. If the value may be uninitialized, [`as_uninit_ref`] - /// must be used instead. - /// - /// [`as_uninit_ref`]: #method.as_uninit_ref - /// - /// # Safety - /// - /// When calling this method, you have to ensure that *either* the pointer is null *or* - /// the pointer is [convertible to a reference](crate::ptr#pointer-to-reference-conversion). + #[doc = include_str!("./docs/as_ref.md")] /// - /// # Panics during const evaluation - /// - /// This method will panic during const evaluation if the pointer cannot be - /// determined to be null or not. See [`is_null`] for more information. + /// ``` + /// let ptr: *const u8 = &10u8 as *const u8; /// - /// [`is_null`]: #method.is_null + /// unsafe { + /// let val_back = &*ptr; + /// assert_eq!(val_back, &10); + /// } + /// ``` /// /// # Examples /// @@ -284,20 +256,9 @@ impl<T: PointeeSized> *const T { /// } /// ``` /// - /// # Null-unchecked version /// - /// If you are sure the pointer can never be null and are looking for some kind of - /// `as_ref_unchecked` that returns the `&T` instead of `Option<&T>`, know that you can - /// dereference the pointer directly. - /// - /// ``` - /// let ptr: *const u8 = &10u8 as *const u8; - /// - /// unsafe { - /// let val_back = &*ptr; - /// assert_eq!(val_back, &10); - /// } - /// ``` + /// [`is_null`]: #method.is_null + /// [`as_uninit_ref`]: #method.as_uninit_ref #[stable(feature = "ptr_as_ref", since = "1.9.0")] #[rustc_const_stable(feature = "const_ptr_is_null", since = "1.84.0")] #[inline] @@ -338,23 +299,10 @@ impl<T: PointeeSized> *const T { unsafe { &*self } } - /// Returns `None` if the pointer is null, or else returns a shared reference to - /// the value wrapped in `Some`. In contrast to [`as_ref`], this does not require - /// that the value has to be initialized. - /// - /// [`as_ref`]: #method.as_ref - /// - /// # Safety - /// - /// When calling this method, you have to ensure that *either* the pointer is null *or* - /// the pointer is [convertible to a reference](crate::ptr#pointer-to-reference-conversion). - /// - /// # Panics during const evaluation - /// - /// This method will panic during const evaluation if the pointer cannot be - /// determined to be null or not. See [`is_null`] for more information. + #[doc = include_str!("./docs/as_uninit_ref.md")] /// /// [`is_null`]: #method.is_null + /// [`as_ref`]: #method.as_ref /// /// # Examples /// diff --git a/library/core/src/ptr/docs/INFO.md b/library/core/src/ptr/docs/INFO.md new file mode 100644 index 00000000000..28a0da4926a --- /dev/null +++ b/library/core/src/ptr/docs/INFO.md @@ -0,0 +1,21 @@ +This directory holds method documentation that otherwise +would be duplicated across mutable and immutable pointers. + +Note that most of the docs here are not the complete docs +for their corresponding method. This is for a few reasons: + +1. Examples need to be different for mutable/immutable + pointers, in order to actually call the correct method. +2. Link reference definitions are frequently different + between mutable/immutable pointers, in order to link to + the correct method. + For example, `<*const T>::as_ref` links to + `<*const T>::is_null`, while `<*mut T>::as_ref` links to + `<*mut T>::is_null`. +3. Many methods on mutable pointers link to an alternate + version that returns a mutable reference instead of + a shared reference. + +Always review the rendered docs manually when making +changes to these files to make sure you're not accidentally +splitting up a section. diff --git a/library/core/src/ptr/docs/addr.md b/library/core/src/ptr/docs/addr.md new file mode 100644 index 00000000000..785b88a9987 --- /dev/null +++ b/library/core/src/ptr/docs/addr.md @@ -0,0 +1,22 @@ +Gets the "address" portion of the pointer. + +This is similar to `self as usize`, except that the [provenance][crate::ptr#provenance] of +the pointer is discarded and not [exposed][crate::ptr#exposed-provenance]. This means that +casting the returned address back to a pointer yields a [pointer without +provenance][without_provenance], which is undefined behavior to dereference. To properly +restore the lost information and obtain a dereferenceable pointer, use +[`with_addr`][pointer::with_addr] or [`map_addr`][pointer::map_addr]. + +If using those APIs is not possible because there is no way to preserve a pointer with the +required provenance, then Strict Provenance might not be for you. Use pointer-integer casts +or [`expose_provenance`][pointer::expose_provenance] and [`with_exposed_provenance`][with_exposed_provenance] +instead. However, note that this makes your code less portable and less amenable to tools +that check for compliance with the Rust memory model. + +On most platforms this will produce a value with the same bytes as the original +pointer, because all the bytes are dedicated to describing the address. +Platforms which need to store additional information in the pointer may +perform a change of representation to produce a value containing only the address +portion of the pointer. What that means is up to the platform to define. + +This is a [Strict Provenance][crate::ptr#strict-provenance] API. diff --git a/library/core/src/ptr/docs/as_ref.md b/library/core/src/ptr/docs/as_ref.md new file mode 100644 index 00000000000..0c0d2768c74 --- /dev/null +++ b/library/core/src/ptr/docs/as_ref.md @@ -0,0 +1,19 @@ +Returns `None` if the pointer is null, or else returns a shared reference to +the value wrapped in `Some`. If the value may be uninitialized, [`as_uninit_ref`] +must be used instead. + +# Safety + +When calling this method, you have to ensure that *either* the pointer is null *or* +the pointer is [convertible to a reference](crate::ptr#pointer-to-reference-conversion). + +# Panics during const evaluation + +This method will panic during const evaluation if the pointer cannot be +determined to be null or not. See [`is_null`] for more information. + +# Null-unchecked version + +If you are sure the pointer can never be null and are looking for some kind of +`as_ref_unchecked` that returns the `&T` instead of `Option<&T>`, know that you can +dereference the pointer directly. diff --git a/library/core/src/ptr/docs/as_uninit_ref.md b/library/core/src/ptr/docs/as_uninit_ref.md new file mode 100644 index 00000000000..5b9a1ecb85b --- /dev/null +++ b/library/core/src/ptr/docs/as_uninit_ref.md @@ -0,0 +1,15 @@ +Returns `None` if the pointer is null, or else returns a shared reference to +the value wrapped in `Some`. In contrast to [`as_ref`], this does not require +that the value has to be initialized. + +# Safety + +When calling this method, you have to ensure that *either* the pointer is null *or* +the pointer is [convertible to a reference](crate::ptr#pointer-to-reference-conversion). +Note that because the created reference is to `MaybeUninit<T>`, the +source pointer can point to uninitialized memory. + +# Panics during const evaluation + +This method will panic during const evaluation if the pointer cannot be +determined to be null or not. See [`is_null`] for more information. diff --git a/library/core/src/ptr/mut_ptr.rs b/library/core/src/ptr/mut_ptr.rs index ce6eee4f911..ba78afc7ea1 100644 --- a/library/core/src/ptr/mut_ptr.rs +++ b/library/core/src/ptr/mut_ptr.rs @@ -135,28 +135,9 @@ impl<T: PointeeSized> *mut T { self as _ } - /// Gets the "address" portion of the pointer. - /// - /// This is similar to `self as usize`, except that the [provenance][crate::ptr#provenance] of - /// the pointer is discarded and not [exposed][crate::ptr#exposed-provenance]. This means that - /// casting the returned address back to a pointer yields a [pointer without - /// provenance][without_provenance_mut], which is undefined behavior to dereference. To properly - /// restore the lost information and obtain a dereferenceable pointer, use - /// [`with_addr`][pointer::with_addr] or [`map_addr`][pointer::map_addr]. - /// - /// If using those APIs is not possible because there is no way to preserve a pointer with the - /// required provenance, then Strict Provenance might not be for you. Use pointer-integer casts - /// or [`expose_provenance`][pointer::expose_provenance] and [`with_exposed_provenance`][with_exposed_provenance] - /// instead. However, note that this makes your code less portable and less amenable to tools - /// that check for compliance with the Rust memory model. - /// - /// On most platforms this will produce a value with the same bytes as the original - /// pointer, because all the bytes are dedicated to describing the address. - /// Platforms which need to store additional information in the pointer may - /// perform a change of representation to produce a value containing only the address - /// portion of the pointer. What that means is up to the platform to define. + #[doc = include_str!("./docs/addr.md")] /// - /// This is a [Strict Provenance][crate::ptr#strict-provenance] API. + /// [without_provenance]: without_provenance_mut #[must_use] #[inline(always)] #[stable(feature = "strict_provenance", since = "1.84.0")] @@ -243,26 +224,16 @@ impl<T: PointeeSized> *mut T { (self.cast(), super::metadata(self)) } - /// Returns `None` if the pointer is null, or else returns a shared reference to - /// the value wrapped in `Some`. If the value may be uninitialized, [`as_uninit_ref`] - /// must be used instead. - /// - /// For the mutable counterpart see [`as_mut`]. + #[doc = include_str!("./docs/as_ref.md")] /// - /// [`as_uninit_ref`]: pointer#method.as_uninit_ref-1 - /// [`as_mut`]: #method.as_mut - /// - /// # Safety - /// - /// When calling this method, you have to ensure that *either* the pointer is null *or* - /// the pointer is [convertible to a reference](crate::ptr#pointer-to-reference-conversion). - /// - /// # Panics during const evaluation - /// - /// This method will panic during const evaluation if the pointer cannot be - /// determined to be null or not. See [`is_null`] for more information. + /// ``` + /// let ptr: *mut u8 = &mut 10u8 as *mut u8; /// - /// [`is_null`]: #method.is_null-1 + /// unsafe { + /// let val_back = &*ptr; + /// println!("We got back the value: {val_back}!"); + /// } + /// ``` /// /// # Examples /// @@ -276,20 +247,14 @@ impl<T: PointeeSized> *mut T { /// } /// ``` /// - /// # Null-unchecked version - /// - /// If you are sure the pointer can never be null and are looking for some kind of - /// `as_ref_unchecked` that returns the `&T` instead of `Option<&T>`, know that you can - /// dereference the pointer directly. + /// # See Also /// - /// ``` - /// let ptr: *mut u8 = &mut 10u8 as *mut u8; + /// For the mutable counterpart see [`as_mut`]. /// - /// unsafe { - /// let val_back = &*ptr; - /// println!("We got back the value: {val_back}!"); - /// } - /// ``` + /// [`is_null`]: #method.is_null-1 + /// [`as_uninit_ref`]: pointer#method.as_uninit_ref-1 + /// [`as_mut`]: #method.as_mut + #[stable(feature = "ptr_as_ref", since = "1.9.0")] #[rustc_const_stable(feature = "const_ptr_is_null", since = "1.84.0")] #[inline] @@ -332,28 +297,15 @@ impl<T: PointeeSized> *mut T { unsafe { &*self } } - /// Returns `None` if the pointer is null, or else returns a shared reference to - /// the value wrapped in `Some`. In contrast to [`as_ref`], this does not require - /// that the value has to be initialized. - /// - /// For the mutable counterpart see [`as_uninit_mut`]. + #[doc = include_str!("./docs/as_uninit_ref.md")] /// + /// [`is_null`]: #method.is_null-1 /// [`as_ref`]: pointer#method.as_ref-1 - /// [`as_uninit_mut`]: #method.as_uninit_mut - /// - /// # Safety - /// - /// When calling this method, you have to ensure that *either* the pointer is null *or* - /// the pointer is [convertible to a reference](crate::ptr#pointer-to-reference-conversion). - /// Note that because the created reference is to `MaybeUninit<T>`, the - /// source pointer can point to uninitialized memory. - /// - /// # Panics during const evaluation /// - /// This method will panic during const evaluation if the pointer cannot be - /// determined to be null or not. See [`is_null`] for more information. + /// # See Also + /// For the mutable counterpart see [`as_uninit_mut`]. /// - /// [`is_null`]: #method.is_null-1 + /// [`as_uninit_mut`]: #method.as_uninit_mut /// /// # Examples /// diff --git a/library/core/src/range.rs b/library/core/src/range.rs index 8c49123fdaf..a096a8ceafc 100644 --- a/library/core/src/range.rs +++ b/library/core/src/range.rs @@ -49,7 +49,8 @@ pub use crate::ops::{Bound, IntoBounds, OneSidedRange, RangeBounds, RangeFull, R /// assert_eq!(3 + 4 + 5, Range::from(3..6).into_iter().sum()); /// ``` #[lang = "RangeCopy"] -#[derive(Clone, Copy, Default, PartialEq, Eq, Hash)] +#[derive(Copy, Hash)] +#[derive_const(Clone, Default, PartialEq, Eq)] #[unstable(feature = "new_range_api", issue = "125687")] pub struct Range<Idx> { /// The lower bound of the range (inclusive). @@ -424,7 +425,8 @@ impl<T> const From<legacy::RangeInclusive<T>> for RangeInclusive<T> { /// assert_eq!(2 + 3 + 4, RangeFrom::from(2..).into_iter().take(3).sum()); /// ``` #[lang = "RangeFromCopy"] -#[derive(Clone, Copy, PartialEq, Eq, Hash)] +#[derive(Copy, Hash)] +#[derive_const(Clone, PartialEq, Eq)] #[unstable(feature = "new_range_api", issue = "125687")] pub struct RangeFrom<Idx> { /// The lower bound of the range (inclusive). diff --git a/library/core/src/result.rs b/library/core/src/result.rs index 7dffab9b316..5c1f64bfe14 100644 --- a/library/core/src/result.rs +++ b/library/core/src/result.rs @@ -542,7 +542,8 @@ use crate::{convert, fmt, hint}; /// /// See the [module documentation](self) for details. #[doc(search_unbox)] -#[derive(Copy, PartialEq, PartialOrd, Eq, Ord, Debug, Hash)] +#[derive(Copy, Debug, Hash)] +#[derive_const(PartialEq, PartialOrd, Eq, Ord)] #[must_use = "this `Result` may be an `Err` variant, which should be handled"] #[rustc_diagnostic_item = "Result"] #[stable(feature = "rust1", since = "1.0.0")] diff --git a/library/core/src/slice/cmp.rs b/library/core/src/slice/cmp.rs index 0d801306984..103630aba0f 100644 --- a/library/core/src/slice/cmp.rs +++ b/library/core/src/slice/cmp.rs @@ -23,7 +23,8 @@ where } #[stable(feature = "rust1", since = "1.0.0")] -impl<T: Eq> Eq for [T] {} +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl<T: [const] Eq> const Eq for [T] {} /// Implements comparison of slices [lexicographically](Ord#lexicographical-comparison). #[stable(feature = "rust1", since = "1.0.0")] @@ -34,7 +35,7 @@ impl<T: Ord> Ord for [T] { } #[inline] -fn as_underlying(x: ControlFlow<bool>) -> u8 { +const fn as_underlying(x: ControlFlow<bool>) -> u8 { // SAFETY: This will only compile if `bool` and `ControlFlow<bool>` have the same // size (which isn't guaranteed but this is libcore). Because they have the same // size, it's a niched implementation, which in one byte means there can't be @@ -154,12 +155,16 @@ where } #[doc(hidden)] +#[const_trait] +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] // intermediate trait for specialization of slice's PartialOrd trait SlicePartialOrd: Sized { fn partial_compare(left: &[Self], right: &[Self]) -> Option<Ordering>; } #[doc(hidden)] +#[const_trait] +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] // intermediate trait for specialization of slice's PartialOrd chaining methods trait SliceChain: Sized { fn chaining_lt(left: &[Self], right: &[Self]) -> ControlFlow<bool>; @@ -231,14 +236,17 @@ where } */ -impl<A: AlwaysApplicableOrd> SlicePartialOrd for A { +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl<A: [const] AlwaysApplicableOrd> const SlicePartialOrd for A { fn partial_compare(left: &[A], right: &[A]) -> Option<Ordering> { Some(SliceOrd::compare(left, right)) } } #[rustc_specialization_trait] -trait AlwaysApplicableOrd: SliceOrd + Ord {} +#[const_trait] +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +trait AlwaysApplicableOrd: [const] SliceOrd + [const] Ord {} macro_rules! always_applicable_ord { ($([$($p:tt)*] $t:ty,)*) => { @@ -257,6 +265,8 @@ always_applicable_ord! { } #[doc(hidden)] +#[const_trait] +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] // intermediate trait for specialization of slice's Ord trait SliceOrd: Sized { fn compare(left: &[Self], right: &[Self]) -> Ordering; @@ -282,17 +292,24 @@ impl<A: Ord> SliceOrd for A { /// * For every `x` and `y` of this type, `Ord(x, y)` must return the same /// value as `Ord::cmp(transmute::<_, u8>(x), transmute::<_, u8>(y))`. #[rustc_specialization_trait] -unsafe trait UnsignedBytewiseOrd: Ord {} +#[const_trait] +unsafe trait UnsignedBytewiseOrd: [const] Ord {} -unsafe impl UnsignedBytewiseOrd for bool {} -unsafe impl UnsignedBytewiseOrd for u8 {} -unsafe impl UnsignedBytewiseOrd for NonZero<u8> {} -unsafe impl UnsignedBytewiseOrd for Option<NonZero<u8>> {} -unsafe impl UnsignedBytewiseOrd for ascii::Char {} +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +unsafe impl const UnsignedBytewiseOrd for bool {} +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +unsafe impl const UnsignedBytewiseOrd for u8 {} +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +unsafe impl const UnsignedBytewiseOrd for NonZero<u8> {} +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +unsafe impl const UnsignedBytewiseOrd for Option<NonZero<u8>> {} +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +unsafe impl const UnsignedBytewiseOrd for ascii::Char {} // `compare_bytes` compares a sequence of unsigned bytes lexicographically, so // use it if the requirements for `UnsignedBytewiseOrd` are fulfilled. -impl<A: Ord + UnsignedBytewiseOrd> SliceOrd for A { +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl<A: [const] Ord + [const] UnsignedBytewiseOrd> const SliceOrd for A { #[inline] fn compare(left: &[Self], right: &[Self]) -> Ordering { // Since the length of a slice is always less than or equal to @@ -317,7 +334,9 @@ impl<A: Ord + UnsignedBytewiseOrd> SliceOrd for A { } // Don't generate our own chaining loops for `memcmp`-able things either. -impl<A: PartialOrd + UnsignedBytewiseOrd> SliceChain for A { + +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl<A: [const] PartialOrd + [const] UnsignedBytewiseOrd> const SliceChain for A { #[inline] fn chaining_lt(left: &[Self], right: &[Self]) -> ControlFlow<bool> { match SliceOrd::compare(left, right) { diff --git a/library/core/src/str/traits.rs b/library/core/src/str/traits.rs index 5adae62b7e6..a7cc943994c 100644 --- a/library/core/src/str/traits.rs +++ b/library/core/src/str/traits.rs @@ -32,7 +32,8 @@ impl const PartialEq for str { } #[stable(feature = "rust1", since = "1.0.0")] -impl Eq for str {} +#[rustc_const_unstable(feature = "const_cmp", issue = "143800")] +impl const Eq for str {} /// Implements comparison operations on strings. /// diff --git a/library/core/src/tuple.rs b/library/core/src/tuple.rs index 2cdee1803a9..3892f831076 100644 --- a/library/core/src/tuple.rs +++ b/library/core/src/tuple.rs @@ -23,7 +23,8 @@ macro_rules! tuple_impls { maybe_tuple_doc! { $($T)+ @ #[stable(feature = "rust1", since = "1.0.0")] - impl<$($T: PartialEq),+> PartialEq for ($($T,)+) { + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl<$($T: [const] PartialEq),+> const PartialEq for ($($T,)+) { #[inline] fn eq(&self, other: &($($T,)+)) -> bool { $( ${ignore($T)} self.${index()} == other.${index()} )&&+ @@ -38,7 +39,8 @@ macro_rules! tuple_impls { maybe_tuple_doc! { $($T)+ @ #[stable(feature = "rust1", since = "1.0.0")] - impl<$($T: Eq),+> Eq for ($($T,)+) + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl<$($T: [const] Eq),+> const Eq for ($($T,)+) {} } @@ -66,7 +68,8 @@ macro_rules! tuple_impls { maybe_tuple_doc! { $($T)+ @ #[stable(feature = "rust1", since = "1.0.0")] - impl<$($T: PartialOrd),+> PartialOrd for ($($T,)+) + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl<$($T: [const] PartialOrd),+> const PartialOrd for ($($T,)+) { #[inline] fn partial_cmp(&self, other: &($($T,)+)) -> Option<Ordering> { @@ -110,7 +113,8 @@ macro_rules! tuple_impls { maybe_tuple_doc! { $($T)+ @ #[stable(feature = "rust1", since = "1.0.0")] - impl<$($T: Ord),+> Ord for ($($T,)+) + #[rustc_const_unstable(feature = "const_cmp", issue = "143800")] + impl<$($T: [const] Ord),+> const Ord for ($($T,)+) { #[inline] fn cmp(&self, other: &($($T,)+)) -> Ordering { diff --git a/library/coretests/tests/alloc.rs b/library/coretests/tests/alloc.rs index 72fdf82c1f8..a4af6fd32a1 100644 --- a/library/coretests/tests/alloc.rs +++ b/library/coretests/tests/alloc.rs @@ -56,6 +56,30 @@ fn layout_array_edge_cases() { } #[test] +fn layout_errors() { + let layout = Layout::new::<[u8; 2]>(); + // Should error if the alignment is not a power of two. + assert!(layout.align_to(3).is_err()); + + // The remaining assertions ensure that the methods error on arithmetic overflow as the + // alignment cannot overflow `isize`. + let size = layout.size(); + let size_max = isize::MAX as usize; + let align_max = size_max / size; + + assert!(layout.align_to(size_max + 1).is_err()); + + assert!(layout.repeat(align_max).is_ok()); + assert!(layout.repeat(align_max + 1).is_err()); + + assert!(layout.repeat_packed(align_max).is_ok()); + assert!(layout.repeat_packed(align_max + 1).is_err()); + + let next = Layout::from_size_align(size_max, 1).unwrap(); + assert!(layout.extend(next).is_err()); +} + +#[test] fn layout_debug_shows_log2_of_alignment() { // `Debug` is not stable, but here's what it does right now let layout = Layout::from_size_align(24576, 8192).unwrap(); diff --git a/library/coretests/tests/array.rs b/library/coretests/tests/array.rs index 30ccbbc3203..c4a8fc74fec 100644 --- a/library/coretests/tests/array.rs +++ b/library/coretests/tests/array.rs @@ -717,3 +717,10 @@ fn array_map_drops_unmapped_elements_on_panic() { assert_eq!(counter.load(Ordering::SeqCst), MAX); } } + +// This covers the `PartialEq::<[T]>::eq` impl for `[T; N]` when it returns false. +#[test] +fn array_eq() { + let not_true = [0u8] == [].as_slice(); + assert!(!not_true); +} diff --git a/library/coretests/tests/char.rs b/library/coretests/tests/char.rs index 852f073bae1..6f94065b2d9 100644 --- a/library/coretests/tests/char.rs +++ b/library/coretests/tests/char.rs @@ -220,6 +220,7 @@ fn test_escape_default() { } assert_eq!(string('\n'), "\\n"); assert_eq!(string('\r'), "\\r"); + assert_eq!(string('\t'), "\\t"); assert_eq!(string('\''), "\\'"); assert_eq!(string('"'), "\\\""); assert_eq!(string(' '), " "); @@ -417,3 +418,45 @@ fn eu_iterator_specializations() { check('\u{12340}'); check('\u{10FFFF}'); } + +#[test] +#[should_panic] +fn test_from_digit_radix_too_high() { + let _ = char::from_digit(0, 37); +} + +#[test] +fn test_from_digit_invalid_radix() { + assert!(char::from_digit(10, 9).is_none()); +} + +#[test] +#[should_panic] +fn test_to_digit_radix_too_low() { + let _ = 'a'.to_digit(1); +} + +#[test] +#[should_panic] +fn test_to_digit_radix_too_high() { + let _ = 'a'.to_digit(37); +} + +#[test] +fn test_as_ascii_invalid() { + assert!('❤'.as_ascii().is_none()); +} + +#[test] +#[should_panic] +fn test_encode_utf8_raw_buffer_too_small() { + let mut buf = [0u8; 1]; + let _ = char::encode_utf8_raw('ß'.into(), &mut buf); +} + +#[test] +#[should_panic] +fn test_encode_utf16_raw_buffer_too_small() { + let mut buf = [0u16; 1]; + let _ = char::encode_utf16_raw('𐐷'.into(), &mut buf); +} diff --git a/library/coretests/tests/cmp.rs b/library/coretests/tests/cmp.rs index 6c4e2146f91..55e35a4a725 100644 --- a/library/coretests/tests/cmp.rs +++ b/library/coretests/tests/cmp.rs @@ -215,19 +215,18 @@ fn cmp_default() { assert_eq!(Fool(false), Fool(true)); } -/* FIXME(#110395) mod const_cmp { use super::*; struct S(i32); - impl PartialEq for S { + impl const PartialEq for S { fn eq(&self, other: &Self) -> bool { self.0 == other.0 } } - impl PartialOrd for S { + impl const PartialOrd for S { fn partial_cmp(&self, other: &Self) -> Option<Ordering> { let ret = match (self.0, other.0) { (a, b) if a > b => Ordering::Greater, @@ -247,4 +246,3 @@ mod const_cmp { const _: () = assert!(S(0) < S(1)); const _: () = assert!(S(1) > S(0)); } -*/ diff --git a/library/coretests/tests/floats/f128.rs b/library/coretests/tests/floats/f128.rs index 4267fef50f8..d31eba863f5 100644 --- a/library/coretests/tests/floats/f128.rs +++ b/library/coretests/tests/floats/f128.rs @@ -17,12 +17,6 @@ const TOL: f128 = 1e-12; #[allow(unused)] const TOL_PRECISE: f128 = 1e-28; -/// First pattern over the mantissa -const NAN_MASK1: u128 = 0x0000aaaaaaaaaaaaaaaaaaaaaaaaaaaa; - -/// Second pattern over the mantissa -const NAN_MASK2: u128 = 0x00005555555555555555555555555555; - // FIXME(f16_f128,miri): many of these have to be disabled since miri does not yet support // the intrinsics. @@ -55,28 +49,6 @@ fn test_max_recip() { } #[test] -fn test_float_bits_conv() { - assert_eq!((1f128).to_bits(), 0x3fff0000000000000000000000000000); - assert_eq!((12.5f128).to_bits(), 0x40029000000000000000000000000000); - assert_eq!((1337f128).to_bits(), 0x40094e40000000000000000000000000); - assert_eq!((-14.25f128).to_bits(), 0xc002c800000000000000000000000000); - assert_biteq!(f128::from_bits(0x3fff0000000000000000000000000000), 1.0); - assert_biteq!(f128::from_bits(0x40029000000000000000000000000000), 12.5); - assert_biteq!(f128::from_bits(0x40094e40000000000000000000000000), 1337.0); - assert_biteq!(f128::from_bits(0xc002c800000000000000000000000000), -14.25); - - // Check that NaNs roundtrip their bits regardless of signaling-ness - // 0xA is 0b1010; 0x5 is 0b0101 -- so these two together clobbers all the mantissa bits - let masked_nan1 = f128::NAN.to_bits() ^ NAN_MASK1; - let masked_nan2 = f128::NAN.to_bits() ^ NAN_MASK2; - assert!(f128::from_bits(masked_nan1).is_nan()); - assert!(f128::from_bits(masked_nan2).is_nan()); - - assert_eq!(f128::from_bits(masked_nan1).to_bits(), masked_nan1); - assert_eq!(f128::from_bits(masked_nan2).to_bits(), masked_nan2); -} - -#[test] fn test_from() { assert_biteq!(f128::from(false), 0.0); assert_biteq!(f128::from(true), 1.0); diff --git a/library/coretests/tests/floats/f16.rs b/library/coretests/tests/floats/f16.rs index d2818a6d768..302fd0861d7 100644 --- a/library/coretests/tests/floats/f16.rs +++ b/library/coretests/tests/floats/f16.rs @@ -19,12 +19,6 @@ const TOL_P2: f16 = 0.5; #[allow(unused)] const TOL_P4: f16 = 10.0; -/// First pattern over the mantissa -const NAN_MASK1: u16 = 0x02aa; - -/// Second pattern over the mantissa -const NAN_MASK2: u16 = 0x0155; - // FIXME(f16_f128,miri): many of these have to be disabled since miri does not yet support // the intrinsics. @@ -53,27 +47,6 @@ fn test_max_recip() { } #[test] -fn test_float_bits_conv() { - assert_eq!((1f16).to_bits(), 0x3c00); - assert_eq!((12.5f16).to_bits(), 0x4a40); - assert_eq!((1337f16).to_bits(), 0x6539); - assert_eq!((-14.25f16).to_bits(), 0xcb20); - assert_biteq!(f16::from_bits(0x3c00), 1.0); - assert_biteq!(f16::from_bits(0x4a40), 12.5); - assert_biteq!(f16::from_bits(0x6539), 1337.0); - assert_biteq!(f16::from_bits(0xcb20), -14.25); - - // Check that NaNs roundtrip their bits regardless of signaling-ness - let masked_nan1 = f16::NAN.to_bits() ^ NAN_MASK1; - let masked_nan2 = f16::NAN.to_bits() ^ NAN_MASK2; - assert!(f16::from_bits(masked_nan1).is_nan()); - assert!(f16::from_bits(masked_nan2).is_nan()); - - assert_eq!(f16::from_bits(masked_nan1).to_bits(), masked_nan1); - assert_eq!(f16::from_bits(masked_nan2).to_bits(), masked_nan2); -} - -#[test] fn test_from() { assert_biteq!(f16::from(false), 0.0); assert_biteq!(f16::from(true), 1.0); diff --git a/library/coretests/tests/floats/f32.rs b/library/coretests/tests/floats/f32.rs index 7b25f354da4..a1fe8b07650 100644 --- a/library/coretests/tests/floats/f32.rs +++ b/library/coretests/tests/floats/f32.rs @@ -2,12 +2,6 @@ use core::f32; use super::assert_biteq; -/// First pattern over the mantissa -const NAN_MASK1: u32 = 0x002a_aaaa; - -/// Second pattern over the mantissa -const NAN_MASK2: u32 = 0x0055_5555; - // FIXME(#140515): mingw has an incorrect fma https://sourceforge.net/p/mingw-w64/bugs/848/ #[cfg_attr(all(target_os = "windows", target_env = "gnu", not(target_abi = "llvm")), ignore)] #[test] @@ -25,25 +19,3 @@ fn test_mul_add() { assert_biteq!(f32::math::mul_add(8.9f32, inf, 3.2), inf); assert_biteq!(f32::math::mul_add(-3.2f32, 2.4, neg_inf), neg_inf); } - -#[test] -fn test_float_bits_conv() { - assert_eq!((1f32).to_bits(), 0x3f800000); - assert_eq!((12.5f32).to_bits(), 0x41480000); - assert_eq!((1337f32).to_bits(), 0x44a72000); - assert_eq!((-14.25f32).to_bits(), 0xc1640000); - assert_biteq!(f32::from_bits(0x3f800000), 1.0); - assert_biteq!(f32::from_bits(0x41480000), 12.5); - assert_biteq!(f32::from_bits(0x44a72000), 1337.0); - assert_biteq!(f32::from_bits(0xc1640000), -14.25); - - // Check that NaNs roundtrip their bits regardless of signaling-ness - // 0xA is 0b1010; 0x5 is 0b0101 -- so these two together clobbers all the mantissa bits - let masked_nan1 = f32::NAN.to_bits() ^ NAN_MASK1; - let masked_nan2 = f32::NAN.to_bits() ^ NAN_MASK2; - assert!(f32::from_bits(masked_nan1).is_nan()); - assert!(f32::from_bits(masked_nan2).is_nan()); - - assert_eq!(f32::from_bits(masked_nan1).to_bits(), masked_nan1); - assert_eq!(f32::from_bits(masked_nan2).to_bits(), masked_nan2); -} diff --git a/library/coretests/tests/floats/f64.rs b/library/coretests/tests/floats/f64.rs index 099d85627a3..4c5a3d68d1f 100644 --- a/library/coretests/tests/floats/f64.rs +++ b/library/coretests/tests/floats/f64.rs @@ -2,12 +2,6 @@ use core::f64; use super::assert_biteq; -/// First pattern over the mantissa -const NAN_MASK1: u64 = 0x000a_aaaa_aaaa_aaaa; - -/// Second pattern over the mantissa -const NAN_MASK2: u64 = 0x0005_5555_5555_5555; - // FIXME(#140515): mingw has an incorrect fma https://sourceforge.net/p/mingw-w64/bugs/848/ #[cfg_attr(all(target_os = "windows", target_env = "gnu", not(target_abi = "llvm")), ignore)] #[test] @@ -25,24 +19,3 @@ fn test_mul_add() { assert_biteq!(8.9f64.mul_add(inf, 3.2), inf); assert_biteq!((-3.2f64).mul_add(2.4, neg_inf), neg_inf); } - -#[test] -fn test_float_bits_conv() { - assert_eq!((1f64).to_bits(), 0x3ff0000000000000); - assert_eq!((12.5f64).to_bits(), 0x4029000000000000); - assert_eq!((1337f64).to_bits(), 0x4094e40000000000); - assert_eq!((-14.25f64).to_bits(), 0xc02c800000000000); - assert_biteq!(f64::from_bits(0x3ff0000000000000), 1.0); - assert_biteq!(f64::from_bits(0x4029000000000000), 12.5); - assert_biteq!(f64::from_bits(0x4094e40000000000), 1337.0); - assert_biteq!(f64::from_bits(0xc02c800000000000), -14.25); - - // Check that NaNs roundtrip their bits regardless of signaling-ness - let masked_nan1 = f64::NAN.to_bits() ^ NAN_MASK1; - let masked_nan2 = f64::NAN.to_bits() ^ NAN_MASK2; - assert!(f64::from_bits(masked_nan1).is_nan()); - assert!(f64::from_bits(masked_nan2).is_nan()); - - assert_eq!(f64::from_bits(masked_nan1).to_bits(), masked_nan1); - assert_eq!(f64::from_bits(masked_nan2).to_bits(), masked_nan2); -} diff --git a/library/coretests/tests/floats/mod.rs b/library/coretests/tests/floats/mod.rs index c0439845a4a..31515561c63 100644 --- a/library/coretests/tests/floats/mod.rs +++ b/library/coretests/tests/floats/mod.rs @@ -30,6 +30,10 @@ trait TestableFloat: Sized { const EPS_ADD: Self; const EPS_MUL: Self; const EPS_DIV: Self; + const RAW_1: Self; + const RAW_12_DOT_5: Self; + const RAW_1337: Self; + const RAW_MINUS_14_DOT_25: Self; } impl TestableFloat for f16 { @@ -50,6 +54,10 @@ impl TestableFloat for f16 { const EPS_ADD: Self = if cfg!(miri) { 1e1 } else { 0.0 }; const EPS_MUL: Self = if cfg!(miri) { 1e3 } else { 0.0 }; const EPS_DIV: Self = if cfg!(miri) { 1e0 } else { 0.0 }; + const RAW_1: Self = Self::from_bits(0x3c00); + const RAW_12_DOT_5: Self = Self::from_bits(0x4a40); + const RAW_1337: Self = Self::from_bits(0x6539); + const RAW_MINUS_14_DOT_25: Self = Self::from_bits(0xcb20); } impl TestableFloat for f32 { @@ -72,6 +80,10 @@ impl TestableFloat for f32 { const EPS_ADD: Self = if cfg!(miri) { 1e-3 } else { 0.0 }; const EPS_MUL: Self = if cfg!(miri) { 1e-1 } else { 0.0 }; const EPS_DIV: Self = if cfg!(miri) { 1e-4 } else { 0.0 }; + const RAW_1: Self = Self::from_bits(0x3f800000); + const RAW_12_DOT_5: Self = Self::from_bits(0x41480000); + const RAW_1337: Self = Self::from_bits(0x44a72000); + const RAW_MINUS_14_DOT_25: Self = Self::from_bits(0xc1640000); } impl TestableFloat for f64 { @@ -90,6 +102,10 @@ impl TestableFloat for f64 { const EPS_ADD: Self = if cfg!(miri) { 1e-6 } else { 0.0 }; const EPS_MUL: Self = if cfg!(miri) { 1e-6 } else { 0.0 }; const EPS_DIV: Self = if cfg!(miri) { 1e-6 } else { 0.0 }; + const RAW_1: Self = Self::from_bits(0x3ff0000000000000); + const RAW_12_DOT_5: Self = Self::from_bits(0x4029000000000000); + const RAW_1337: Self = Self::from_bits(0x4094e40000000000); + const RAW_MINUS_14_DOT_25: Self = Self::from_bits(0xc02c800000000000); } impl TestableFloat for f128 { @@ -108,6 +124,10 @@ impl TestableFloat for f128 { const EPS_ADD: Self = if cfg!(miri) { 1e-6 } else { 0.0 }; const EPS_MUL: Self = if cfg!(miri) { 1e-6 } else { 0.0 }; const EPS_DIV: Self = if cfg!(miri) { 1e-6 } else { 0.0 }; + const RAW_1: Self = Self::from_bits(0x3fff0000000000000000000000000000); + const RAW_12_DOT_5: Self = Self::from_bits(0x40029000000000000000000000000000); + const RAW_1337: Self = Self::from_bits(0x40094e40000000000000000000000000); + const RAW_MINUS_14_DOT_25: Self = Self::from_bits(0xc002c800000000000000000000000000); } /// Determine the tolerance for values of the argument type. @@ -250,6 +270,8 @@ macro_rules! float_test { $( $( #[$f16_meta] )+ )? fn test_f16() { type $fty = f16; + #[allow(unused)] + const fn flt (x: $fty) -> $fty { x } $test } @@ -257,6 +279,8 @@ macro_rules! float_test { $( $( #[$f32_meta] )+ )? fn test_f32() { type $fty = f32; + #[allow(unused)] + const fn flt (x: $fty) -> $fty { x } $test } @@ -264,6 +288,8 @@ macro_rules! float_test { $( $( #[$f64_meta] )+ )? fn test_f64() { type $fty = f64; + #[allow(unused)] + const fn flt (x: $fty) -> $fty { x } $test } @@ -271,6 +297,8 @@ macro_rules! float_test { $( $( #[$f128_meta] )+ )? fn test_f128() { type $fty = f128; + #[allow(unused)] + const fn flt (x: $fty) -> $fty { x } $test } @@ -293,6 +321,8 @@ macro_rules! float_test { $( $( #[$f16_const_meta] )+ )? fn test_f16() { type $fty = f16; + #[allow(unused)] + const fn flt (x: $fty) -> $fty { x } const { $test } } @@ -300,6 +330,8 @@ macro_rules! float_test { $( $( #[$f32_const_meta] )+ )? fn test_f32() { type $fty = f32; + #[allow(unused)] + const fn flt (x: $fty) -> $fty { x } const { $test } } @@ -307,6 +339,8 @@ macro_rules! float_test { $( $( #[$f64_const_meta] )+ )? fn test_f64() { type $fty = f64; + #[allow(unused)] + const fn flt (x: $fty) -> $fty { x } const { $test } } @@ -314,6 +348,8 @@ macro_rules! float_test { $( $( #[$f128_const_meta] )+ )? fn test_f128() { type $fty = f128; + #[allow(unused)] + const fn flt (x: $fty) -> $fty { x } const { $test } } } @@ -1479,3 +1515,30 @@ float_test! { assert_approx_eq!(a.algebraic_rem(b), a % b, Float::EPS_DIV); } } + +float_test! { + name: to_bits_conv, + attrs: { + f16: #[cfg(target_has_reliable_f16)], + f128: #[cfg(target_has_reliable_f128)], + }, + test<Float> { + assert_biteq!(flt(1.0), Float::RAW_1); + assert_biteq!(flt(12.5), Float::RAW_12_DOT_5); + assert_biteq!(flt(1337.0), Float::RAW_1337); + assert_biteq!(flt(-14.25), Float::RAW_MINUS_14_DOT_25); + assert_biteq!(Float::RAW_1, 1.0); + assert_biteq!(Float::RAW_12_DOT_5, 12.5); + assert_biteq!(Float::RAW_1337, 1337.0); + assert_biteq!(Float::RAW_MINUS_14_DOT_25, -14.25); + + // Check that NaNs roundtrip their bits regardless of signaling-ness + let masked_nan1 = Float::NAN.to_bits() ^ Float::NAN_MASK1; + let masked_nan2 = Float::NAN.to_bits() ^ Float::NAN_MASK2; + assert!(Float::from_bits(masked_nan1).is_nan()); + assert!(Float::from_bits(masked_nan2).is_nan()); + + assert_biteq!(Float::from_bits(masked_nan1), Float::from_bits(masked_nan1)); + assert_biteq!(Float::from_bits(masked_nan2), Float::from_bits(masked_nan2)); + } +} diff --git a/library/coretests/tests/hash/mod.rs b/library/coretests/tests/hash/mod.rs index 1f10a4733b0..043a3ee7423 100644 --- a/library/coretests/tests/hash/mod.rs +++ b/library/coretests/tests/hash/mod.rs @@ -53,12 +53,14 @@ fn test_writer_hasher() { assert_eq!(hash(&5_u16), 5); assert_eq!(hash(&5_u32), 5); assert_eq!(hash(&5_u64), 5); + assert_eq!(hash(&5_u128), 5); assert_eq!(hash(&5_usize), 5); assert_eq!(hash(&5_i8), 5); assert_eq!(hash(&5_i16), 5); assert_eq!(hash(&5_i32), 5); assert_eq!(hash(&5_i64), 5); + assert_eq!(hash(&5_i128), 5); assert_eq!(hash(&5_isize), 5); assert_eq!(hash(&false), 0); @@ -85,6 +87,17 @@ fn test_writer_hasher() { let ptr = ptr::without_provenance_mut::<i32>(5_usize); assert_eq!(hash(&ptr), 5); + // Use a newtype to test the `Hash::hash_slice` default implementation. + struct Byte(u8); + + impl Hash for Byte { + fn hash<H: Hasher>(&self, state: &mut H) { + state.write_u8(self.0) + } + } + + assert_eq!(hash(&[Byte(b'a')]), 97 + 1); + if cfg!(miri) { // Miri cannot hash pointers return; diff --git a/library/coretests/tests/lib.rs b/library/coretests/tests/lib.rs index b5658a9970f..a246c806140 100644 --- a/library/coretests/tests/lib.rs +++ b/library/coretests/tests/lib.rs @@ -13,8 +13,10 @@ #![feature(bool_to_result)] #![feature(bstr)] #![feature(cfg_target_has_reliable_f16_f128)] +#![feature(char_internals)] #![feature(char_max_len)] #![feature(clone_to_uninit)] +#![feature(const_cmp)] #![feature(const_convert)] #![feature(const_destruct)] #![feature(const_eval_select)] @@ -81,6 +83,7 @@ #![feature(next_index)] #![feature(non_exhaustive_omitted_patterns_lint)] #![feature(numfmt)] +#![feature(one_sided_range)] #![feature(option_reduce)] #![feature(pattern)] #![feature(peekable_next_if_map)] diff --git a/library/coretests/tests/ops.rs b/library/coretests/tests/ops.rs index 501e0f33fe4..121718f2167 100644 --- a/library/coretests/tests/ops.rs +++ b/library/coretests/tests/ops.rs @@ -2,7 +2,8 @@ mod control_flow; mod from_residual; use core::ops::{ - Bound, Deref, DerefMut, Range, RangeFrom, RangeFull, RangeInclusive, RangeTo, RangeToInclusive, + Bound, Deref, DerefMut, OneSidedRange, OneSidedRangeBound, Range, RangeBounds, RangeFrom, + RangeFull, RangeInclusive, RangeTo, RangeToInclusive, }; // Test the Range structs and syntax. @@ -71,6 +72,36 @@ fn test_range_to_inclusive() { } #[test] +fn test_range_contains() { + assert!(!(1u32..5).contains(&0u32)); + assert!((1u32..5).contains(&1u32)); + assert!((1u32..5).contains(&4u32)); + assert!(!(1u32..5).contains(&5u32)); + assert!(!(1u32..5).contains(&6u32)); +} + +#[test] +fn test_range_to_contains() { + assert!(!(1u32..=5).contains(&0)); + assert!((1u32..=5).contains(&1)); + assert!((1u32..=5).contains(&4)); + assert!((1u32..=5).contains(&5)); + assert!(!(1u32..=5).contains(&6)); +} + +// This test covers `RangeBounds::contains` when the start is excluded, +// which cannot be directly expressed by Rust's built-in range syntax. +#[test] +fn test_range_bounds_contains() { + let r = (Bound::Excluded(1u32), Bound::Included(5u32)); + assert!(!r.contains(&0)); + assert!(!r.contains(&1)); + assert!(r.contains(&3)); + assert!(r.contains(&5)); + assert!(!r.contains(&6)); +} + +#[test] fn test_range_is_empty() { assert!(!(0.0..10.0).is_empty()); assert!((-0.0..0.0).is_empty()); @@ -92,6 +123,34 @@ fn test_range_is_empty() { } #[test] +fn test_range_inclusive_end_bound() { + let mut r = 1u32..=1; + r.next().unwrap(); + assert!(!r.contains(&1)); +} + +#[test] +fn test_range_bounds() { + let r = (Bound::Included(1u32), Bound::Excluded(5u32)); + assert!(!r.contains(&0)); + assert!(r.contains(&1)); + assert!(r.contains(&3)); + assert!(!r.contains(&5)); + assert!(!r.contains(&6)); + + let r = (Bound::<u32>::Unbounded, Bound::Unbounded); + assert!(r.contains(&0)); + assert!(r.contains(&u32::MAX)); +} + +#[test] +fn test_one_sided_range_bound() { + assert!(matches!((..1u32).bound(), (OneSidedRangeBound::End, 1))); + assert!(matches!((1u32..).bound(), (OneSidedRangeBound::StartInclusive, 1))); + assert!(matches!((..=1u32).bound(), (OneSidedRangeBound::EndInclusive, 1))); +} + +#[test] fn test_bound_cloned_unbounded() { assert_eq!(Bound::<&u32>::Unbounded.cloned(), Bound::Unbounded); } @@ -240,3 +299,17 @@ fn deref_on_ref() { fn test_not_never() { if !return () {} } + +#[test] +fn test_fmt() { + let mut r = 1..=1; + assert_eq!(format!("{:?}", r), "1..=1"); + r.next().unwrap(); + assert_eq!(format!("{:?}", r), "1..=1 (exhausted)"); + + assert_eq!(format!("{:?}", 1..1), "1..1"); + assert_eq!(format!("{:?}", 1..), "1.."); + assert_eq!(format!("{:?}", ..1), "..1"); + assert_eq!(format!("{:?}", ..=1), "..=1"); + assert_eq!(format!("{:?}", ..), ".."); +} diff --git a/library/std/src/keyword_docs.rs b/library/std/src/keyword_docs.rs index 1c55824ab90..7ff4af8ede8 100644 --- a/library/std/src/keyword_docs.rs +++ b/library/std/src/keyword_docs.rs @@ -1257,6 +1257,108 @@ mod ref_keyword {} /// [`async`]: ../std/keyword.async.html mod return_keyword {} +#[doc(keyword = "become")] +// +/// Perform a tail-call of a function. +/// +/// <div class="warning"> +/// +/// `feature(explicit_tail_calls)` is currently incomplete and may not work properly. +/// </div> +/// +/// When tail calling a function, instead of its stack frame being added to the +/// stack, the stack frame of the caller is directly replaced with the callee's. +/// This means that as long as a loop in a call graph only uses tail calls, the +/// stack growth will be bounded. +/// +/// This is useful for writing functional-style code (since it prevents recursion +/// from exhausting resources) or for code optimization (since a tail call +/// *might* be cheaper than a normal call, tail calls can be used in a similar +/// manner to computed goto). +/// +/// Example of using `become` to implement functional-style `fold`: +/// ``` +/// #![feature(explicit_tail_calls)] +/// #![expect(incomplete_features)] +/// +/// fn fold<T: Copy, S>(slice: &[T], init: S, f: impl Fn(S, T) -> S) -> S { +/// match slice { +/// // without `become`, on big inputs this could easily overflow the +/// // stack. using a tail call guarantees that the stack will not grow unboundedly +/// [first, rest @ ..] => become fold(rest, f(init, *first), f), +/// [] => init, +/// } +/// } +/// ``` +/// +/// Compilers can already perform "tail call optimization" -- they can replace normal +/// calls with tail calls, although there are no guarantees that this will be done. +/// However, to perform TCO, the call needs to be the last thing that happens +/// in the functions and be returned from it. This requirement is often broken +/// by drop code for locals, which is run after computing the return expression: +/// +/// ``` +/// fn example() { +/// let string = "meow".to_owned(); +/// println!("{string}"); +/// return help(); // this is *not* the last thing that happens in `example`... +/// } +/// +/// // ... because it is desugared to this: +/// fn example_desugared() { +/// let string = "meow".to_owned(); +/// println!("{string}"); +/// let tmp = help(); +/// drop(string); +/// return tmp; +/// } +/// +/// fn help() {} +/// ``` +/// +/// For this reason, `become` also changes the drop order, such that locals are +/// dropped *before* evaluating the call. +/// +/// In order to guarantee that the compiler can perform a tail call, `become` +/// currently has these requirements: +/// 1. callee and caller must have the same ABI, arguments, and return type +/// 2. callee and caller must not have varargs +/// 3. caller must not be marked with `#[track_caller]` +/// - callee is allowed to be marked with `#[track_caller]` as otherwise +/// adding `#[track_caller]` would be a breaking change. if callee is +/// marked with `#[track_caller]` a tail call is not guaranteed. +/// 4. callee and caller cannot be a closure +/// (unless it's coerced to a function pointer) +/// +/// It is possible to tail-call a function pointer: +/// ``` +/// #![feature(explicit_tail_calls)] +/// #![expect(incomplete_features)] +/// +/// #[derive(Copy, Clone)] +/// enum Inst { Inc, Dec } +/// +/// fn dispatch(stream: &[Inst], state: u32) -> u32 { +/// const TABLE: &[fn(&[Inst], u32) -> u32] = &[increment, decrement]; +/// match stream { +/// [inst, rest @ ..] => become TABLE[*inst as usize](rest, state), +/// [] => state, +/// } +/// } +/// +/// fn increment(stream: &[Inst], state: u32) -> u32 { +/// become dispatch(stream, state + 1) +/// } +/// +/// fn decrement(stream: &[Inst], state: u32) -> u32 { +/// become dispatch(stream, state - 1) +/// } +/// +/// let program = &[Inst::Inc, Inst::Inc, Inst::Dec, Inst::Inc]; +/// assert_eq!(dispatch(program, 0), 2); +/// ``` +mod become_keyword {} + #[doc(keyword = "self")] // /// The receiver of a method, or the current module. diff --git a/library/std/src/lib.rs b/library/std/src/lib.rs index 97db0d6ab75..33e3bf0c085 100644 --- a/library/std/src/lib.rs +++ b/library/std/src/lib.rs @@ -284,7 +284,6 @@ #![feature(core_float_math)] #![feature(decl_macro)] #![feature(deprecated_suggestion)] -#![feature(derive_const)] #![feature(doc_cfg)] #![feature(doc_cfg_hide)] #![feature(doc_masked)] @@ -332,11 +331,7 @@ #![feature(cfg_select)] #![feature(char_internals)] #![feature(clone_to_uninit)] -#![feature(const_cmp)] #![feature(const_convert)] -#![feature(const_ops)] -#![feature(const_option_ops)] -#![feature(const_try)] #![feature(core_intrinsics)] #![feature(core_io_borrowed_buf)] #![feature(drop_guard)] @@ -350,6 +345,7 @@ #![feature(float_gamma)] #![feature(float_minimum_maximum)] #![feature(fmt_internals)] +#![feature(fn_ptr_trait)] #![feature(generic_atomic)] #![feature(hasher_prefixfree_extras)] #![feature(hashmap_internals)] diff --git a/library/std/src/sync/nonpoison/condvar.rs b/library/std/src/sync/nonpoison/condvar.rs index 49afdd87818..994fc6816a0 100644 --- a/library/std/src/sync/nonpoison/condvar.rs +++ b/library/std/src/sync/nonpoison/condvar.rs @@ -198,11 +198,10 @@ impl Condvar { /// the system time. This function is susceptible to spurious wakeups. /// Condition variables normally have a boolean predicate associated with /// them, and the predicate must always be checked each time this function - /// returns to protect against spurious wakeups. Additionally, it is - /// typically desirable for the timeout to not exceed some duration in - /// spite of spurious wakes, thus the sleep-duration is decremented by the - /// amount slept. Alternatively, use the `wait_timeout_while` method - /// to wait with a timeout while a predicate is true. + /// returns to protect against spurious wakeups. Furthermore, since the timeout + /// is given relative to the moment this function is called, it needs to be adjusted + /// when this function is called in a loop. The [`wait_timeout_while`] method + /// lets you wait with a timeout while a predicate is true, taking care of all these concerns. /// /// The returned [`WaitTimeoutResult`] value indicates if the timeout is /// known to have elapsed. diff --git a/library/std/src/sync/poison/condvar.rs b/library/std/src/sync/poison/condvar.rs index 5dc2b510f3a..de625a6cc5f 100644 --- a/library/std/src/sync/poison/condvar.rs +++ b/library/std/src/sync/poison/condvar.rs @@ -269,11 +269,10 @@ impl Condvar { /// the system time. This function is susceptible to spurious wakeups. /// Condition variables normally have a boolean predicate associated with /// them, and the predicate must always be checked each time this function - /// returns to protect against spurious wakeups. Additionally, it is - /// typically desirable for the timeout to not exceed some duration in - /// spite of spurious wakes, thus the sleep-duration is decremented by the - /// amount slept. Alternatively, use the `wait_timeout_while` method - /// to wait with a timeout while a predicate is true. + /// returns to protect against spurious wakeups. Furthermore, since the timeout + /// is given relative to the moment this function is called, it needs to be adjusted + /// when this function is called in a loop. The [`wait_timeout_while`] method + /// lets you wait with a timeout while a predicate is true, taking care of all these concerns. /// /// The returned [`WaitTimeoutResult`] value indicates if the timeout is /// known to have elapsed. diff --git a/library/std/src/sys/mod.rs b/library/std/src/sys/mod.rs index 8c115015580..2dbdc8a4e02 100644 --- a/library/std/src/sys/mod.rs +++ b/library/std/src/sys/mod.rs @@ -31,6 +31,7 @@ pub mod process; pub mod random; pub mod stdio; pub mod sync; +pub mod thread; pub mod thread_local; // FIXME(117276): remove this, move feature implementations into individual diff --git a/library/std/src/sys/net/connection/socket/hermit.rs b/library/std/src/sys/net/connection/socket/hermit.rs index f49821657d9..5200eaa5786 100644 --- a/library/std/src/sys/net/connection/socket/hermit.rs +++ b/library/std/src/sys/net/connection/socket/hermit.rs @@ -304,7 +304,8 @@ impl Socket { } pub fn take_error(&self) -> io::Result<Option<io::Error>> { - unimplemented!() + let raw: c_int = getsockopt(self, libc::SOL_SOCKET, libc::SO_ERROR)?; + if raw == 0 { Ok(None) } else { Ok(Some(io::Error::from_raw_os_error(raw as i32))) } } // This is used by sys_common code to abstract over Windows and Unix. diff --git a/library/std/src/sys/pal/hermit/mod.rs b/library/std/src/sys/pal/hermit/mod.rs index fb8d69b7375..3ddf6e5acb0 100644 --- a/library/std/src/sys/pal/hermit/mod.rs +++ b/library/std/src/sys/pal/hermit/mod.rs @@ -25,7 +25,6 @@ pub mod futex; pub mod os; #[path = "../unsupported/pipe.rs"] pub mod pipe; -pub mod thread; pub mod time; pub fn unsupported<T>() -> crate::io::Result<T> { diff --git a/library/std/src/sys/pal/hermit/os.rs b/library/std/src/sys/pal/hermit/os.rs index 0fe713a503b..9681964ed9b 100644 --- a/library/std/src/sys/pal/hermit/os.rs +++ b/library/std/src/sys/pal/hermit/os.rs @@ -3,7 +3,7 @@ use crate::ffi::{OsStr, OsString}; use crate::marker::PhantomData; use crate::path::{self, PathBuf}; use crate::sys::unsupported; -use crate::{fmt, io, str}; +use crate::{fmt, io}; pub fn errno() -> i32 { unsafe { hermit_abi::get_errno() } diff --git a/library/std/src/sys/pal/hermit/time.rs b/library/std/src/sys/pal/hermit/time.rs index 89a427ab88b..f76a5f96c87 100644 --- a/library/std/src/sys/pal/hermit/time.rs +++ b/library/std/src/sys/pal/hermit/time.rs @@ -25,15 +25,8 @@ impl Timespec { Timespec { t: timespec { tv_sec, tv_nsec } } } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - const fn sub_timespec(&self, other: &Timespec) -> Result<Duration, Duration> { - // FIXME: const PartialOrd - let mut cmp = self.t.tv_sec - other.t.tv_sec; - if cmp == 0 { - cmp = self.t.tv_nsec as i64 - other.t.tv_nsec as i64; - } - - if cmp >= 0 { + fn sub_timespec(&self, other: &Timespec) -> Result<Duration, Duration> { + if self >= other { Ok(if self.t.tv_nsec >= other.t.tv_nsec { Duration::new( (self.t.tv_sec - other.t.tv_sec) as u64, @@ -53,22 +46,20 @@ impl Timespec { } } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - const fn checked_add_duration(&self, other: &Duration) -> Option<Timespec> { + fn checked_add_duration(&self, other: &Duration) -> Option<Timespec> { let mut secs = self.t.tv_sec.checked_add_unsigned(other.as_secs())?; // Nano calculations can't overflow because nanos are <1B which fit // in a u32. - let mut nsec = other.subsec_nanos() + self.t.tv_nsec as u32; - if nsec >= NSEC_PER_SEC as u32 { - nsec -= NSEC_PER_SEC as u32; + let mut nsec = other.subsec_nanos() + u32::try_from(self.t.tv_nsec).unwrap(); + if nsec >= NSEC_PER_SEC.try_into().unwrap() { + nsec -= u32::try_from(NSEC_PER_SEC).unwrap(); secs = secs.checked_add(1)?; } Some(Timespec { t: timespec { tv_sec: secs, tv_nsec: nsec as _ } }) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - const fn checked_sub_duration(&self, other: &Duration) -> Option<Timespec> { + fn checked_sub_duration(&self, other: &Duration) -> Option<Timespec> { let mut secs = self.t.tv_sec.checked_sub_unsigned(other.as_secs())?; // Similar to above, nanos can't overflow. @@ -222,18 +213,15 @@ impl SystemTime { SystemTime(time) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> { + pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> { self.0.sub_timespec(&other.0) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> { + pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> { Some(SystemTime(self.0.checked_add_duration(other)?)) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> { + pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> { Some(SystemTime(self.0.checked_sub_duration(other)?)) } } diff --git a/library/std/src/sys/pal/sgx/abi/mod.rs b/library/std/src/sys/pal/sgx/abi/mod.rs index 57247cffad3..b8c4d7740c4 100644 --- a/library/std/src/sys/pal/sgx/abi/mod.rs +++ b/library/std/src/sys/pal/sgx/abi/mod.rs @@ -67,7 +67,7 @@ extern "C" fn entry(p1: u64, p2: u64, p3: u64, secondary: bool, p4: u64, p5: u64 let tls_guard = unsafe { tls.activate() }; if secondary { - let join_notifier = super::thread::Thread::entry(); + let join_notifier = crate::sys::thread::Thread::entry(); drop(tls_guard); drop(join_notifier); diff --git a/library/std/src/sys/pal/sgx/mod.rs b/library/std/src/sys/pal/sgx/mod.rs index 4a297b6823f..9a33873af58 100644 --- a/library/std/src/sys/pal/sgx/mod.rs +++ b/library/std/src/sys/pal/sgx/mod.rs @@ -13,7 +13,6 @@ mod libunwind_integration; pub mod os; #[path = "../unsupported/pipe.rs"] pub mod pipe; -pub mod thread; pub mod thread_parking; pub mod time; pub mod waitqueue; diff --git a/library/std/src/sys/pal/sgx/time.rs b/library/std/src/sys/pal/sgx/time.rs index 603dae952ab..db4cf2804bf 100644 --- a/library/std/src/sys/pal/sgx/time.rs +++ b/library/std/src/sys/pal/sgx/time.rs @@ -32,22 +32,15 @@ impl SystemTime { SystemTime(usercalls::insecure_time()) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> { - // FIXME: ok_or_else with const closures - match self.0.checked_sub(other.0) { - Some(duration) => Ok(duration), - None => Err(other.0 - self.0), - } + pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> { + self.0.checked_sub(other.0).ok_or_else(|| other.0 - self.0) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> { + pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> { Some(SystemTime(self.0.checked_add(*other)?)) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> { + pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> { Some(SystemTime(self.0.checked_sub(*other)?)) } } diff --git a/library/std/src/sys/pal/solid/mod.rs b/library/std/src/sys/pal/solid/mod.rs index 0011cf256df..9ca6dc58118 100644 --- a/library/std/src/sys/pal/solid/mod.rs +++ b/library/std/src/sys/pal/solid/mod.rs @@ -10,10 +10,8 @@ pub mod itron { pub mod error; pub mod spin; pub mod task; - pub mod thread; pub mod thread_parking; pub mod time; - use super::unsupported; } // `error` is `pub(crate)` so that it can be accessed by `itron/error.rs` as @@ -22,7 +20,7 @@ pub(crate) mod error; pub mod os; #[path = "../unsupported/pipe.rs"] pub mod pipe; -pub use self::itron::{thread, thread_parking}; +pub use self::itron::thread_parking; pub mod time; // SAFETY: must be called only once during runtime initialization. diff --git a/library/std/src/sys/pal/solid/time.rs b/library/std/src/sys/pal/solid/time.rs index e35e60df1a0..c39d715c6a6 100644 --- a/library/std/src/sys/pal/solid/time.rs +++ b/library/std/src/sys/pal/solid/time.rs @@ -39,8 +39,7 @@ impl SystemTime { Self(t) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> { + pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> { if self.0 >= other.0 { Ok(Duration::from_secs((self.0 as u64).wrapping_sub(other.0 as u64))) } else { @@ -48,13 +47,11 @@ impl SystemTime { } } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> { + pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> { Some(SystemTime(self.0.checked_add_unsigned(other.as_secs())?)) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> { + pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> { Some(SystemTime(self.0.checked_sub_unsigned(other.as_secs())?)) } } diff --git a/library/std/src/sys/pal/teeos/mod.rs b/library/std/src/sys/pal/teeos/mod.rs index c7b17777258..dd0155265da 100644 --- a/library/std/src/sys/pal/teeos/mod.rs +++ b/library/std/src/sys/pal/teeos/mod.rs @@ -9,7 +9,6 @@ pub mod os; #[path = "../unsupported/pipe.rs"] pub mod pipe; -pub mod thread; #[allow(non_upper_case_globals)] #[path = "../unix/time.rs"] pub mod time; diff --git a/library/std/src/sys/pal/uefi/mod.rs b/library/std/src/sys/pal/uefi/mod.rs index 8911a2ee519..ebd311db1e1 100644 --- a/library/std/src/sys/pal/uefi/mod.rs +++ b/library/std/src/sys/pal/uefi/mod.rs @@ -17,7 +17,6 @@ pub mod helpers; pub mod os; #[path = "../unsupported/pipe.rs"] pub mod pipe; -pub mod thread; pub mod time; #[cfg(test)] diff --git a/library/std/src/sys/pal/uefi/thread.rs b/library/std/src/sys/pal/uefi/thread.rs deleted file mode 100644 index 47a48008c76..00000000000 --- a/library/std/src/sys/pal/uefi/thread.rs +++ /dev/null @@ -1,66 +0,0 @@ -use super::unsupported; -use crate::ffi::CStr; -use crate::io; -use crate::num::NonZero; -use crate::ptr::NonNull; -use crate::time::{Duration, Instant}; - -pub struct Thread(!); - -pub const DEFAULT_MIN_STACK_SIZE: usize = 64 * 1024; - -impl Thread { - // unsafe: see thread::Builder::spawn_unchecked for safety requirements - pub unsafe fn new( - _stack: usize, - _name: Option<&str>, - _p: Box<dyn FnOnce()>, - ) -> io::Result<Thread> { - unsupported() - } - - pub fn yield_now() { - // do nothing - } - - pub fn set_name(_name: &CStr) { - // nope - } - - pub fn sleep(dur: Duration) { - let boot_services: NonNull<r_efi::efi::BootServices> = - crate::os::uefi::env::boot_services().expect("can't sleep").cast(); - let mut dur_ms = dur.as_micros(); - // ceil up to the nearest microsecond - if dur.subsec_nanos() % 1000 > 0 { - dur_ms += 1; - } - - while dur_ms > 0 { - let ms = crate::cmp::min(dur_ms, usize::MAX as u128); - let _ = unsafe { ((*boot_services.as_ptr()).stall)(ms as usize) }; - dur_ms -= ms; - } - } - - pub fn sleep_until(deadline: Instant) { - let now = Instant::now(); - - if let Some(delay) = deadline.checked_duration_since(now) { - Self::sleep(delay); - } - } - - pub fn join(self) { - self.0 - } -} - -pub(crate) fn current_os_id() -> Option<u64> { - None -} - -pub fn available_parallelism() -> io::Result<NonZero<usize>> { - // UEFI is single threaded - Ok(NonZero::new(1).unwrap()) -} diff --git a/library/std/src/sys/pal/uefi/time.rs b/library/std/src/sys/pal/uefi/time.rs index 36ce3f7ef96..c6636626fd5 100644 --- a/library/std/src/sys/pal/uefi/time.rs +++ b/library/std/src/sys/pal/uefi/time.rs @@ -80,32 +80,19 @@ impl SystemTime { .unwrap_or_else(|| panic!("time not implemented on this platform")) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> { - // FIXME: ok_or_else with const closures - match self.0.checked_sub(other.0) { - Some(duration) => Ok(duration), - None => Err(other.0 - self.0), - } + pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> { + self.0.checked_sub(other.0).ok_or_else(|| other.0 - self.0) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> { - let temp = self.0.checked_add(*other)?; + pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> { + let temp = Self(self.0.checked_add(*other)?); // Check if can be represented in UEFI - // FIXME: const PartialOrd - let mut cmp = temp.as_secs() - MAX_UEFI_TIME.0.as_secs(); - if cmp == 0 { - cmp = temp.subsec_nanos() as u64 - MAX_UEFI_TIME.0.subsec_nanos() as u64; - } - - if cmp <= 0 { Some(SystemTime(temp)) } else { None } + if temp <= MAX_UEFI_TIME { Some(temp) } else { None } } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> { - Some(SystemTime(self.0.checked_sub(*other)?)) + pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> { + self.0.checked_sub(*other).map(Self) } } diff --git a/library/std/src/sys/pal/unix/mod.rs b/library/std/src/sys/pal/unix/mod.rs index ac5c823a1bf..dd1059fe04a 100644 --- a/library/std/src/sys/pal/unix/mod.rs +++ b/library/std/src/sys/pal/unix/mod.rs @@ -17,7 +17,6 @@ pub mod os; pub mod pipe; pub mod stack_overflow; pub mod sync; -pub mod thread; pub mod thread_parking; pub mod time; @@ -55,7 +54,7 @@ pub unsafe fn init(argc: isize, argv: *const *const u8, sigpipe: u8) { // thread-id for the main thread and so renaming the main thread will rename the // process and we only want to enable this on platforms we've tested. if cfg!(target_vendor = "apple") { - thread::Thread::set_name(&c"main"); + crate::sys::thread::set_name(c"main"); } unsafe fn sanitize_standard_fds() { diff --git a/library/std/src/sys/pal/unix/time.rs b/library/std/src/sys/pal/unix/time.rs index 328fe0bc960..bd7f74fea6a 100644 --- a/library/std/src/sys/pal/unix/time.rs +++ b/library/std/src/sys/pal/unix/time.rs @@ -38,18 +38,15 @@ impl SystemTime { SystemTime { t: Timespec::now(libc::CLOCK_REALTIME) } } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> { + pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> { self.t.sub_timespec(&other.t) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> { + pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> { Some(SystemTime { t: self.t.checked_add_duration(other)? }) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> { + pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> { Some(SystemTime { t: self.t.checked_sub_duration(other)? }) } } @@ -136,15 +133,8 @@ impl Timespec { Timespec::new(t.tv_sec as i64, t.tv_nsec as i64).unwrap() } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn sub_timespec(&self, other: &Timespec) -> Result<Duration, Duration> { - // FIXME: const PartialOrd - let mut cmp = self.tv_sec - other.tv_sec; - if cmp == 0 { - cmp = self.tv_nsec.as_inner() as i64 - other.tv_nsec.as_inner() as i64; - } - - if cmp >= 0 { + pub fn sub_timespec(&self, other: &Timespec) -> Result<Duration, Duration> { + if self >= other { // NOTE(eddyb) two aspects of this `if`-`else` are required for LLVM // to optimize it into a branchless form (see also #75545): // @@ -179,8 +169,7 @@ impl Timespec { } } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_add_duration(&self, other: &Duration) -> Option<Timespec> { + pub fn checked_add_duration(&self, other: &Duration) -> Option<Timespec> { let mut secs = self.tv_sec.checked_add_unsigned(other.as_secs())?; // Nano calculations can't overflow because nanos are <1B which fit @@ -190,11 +179,10 @@ impl Timespec { nsec -= NSEC_PER_SEC as u32; secs = secs.checked_add(1)?; } - Some(unsafe { Timespec::new_unchecked(secs, nsec as i64) }) + Some(unsafe { Timespec::new_unchecked(secs, nsec.into()) }) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_sub_duration(&self, other: &Duration) -> Option<Timespec> { + pub fn checked_sub_duration(&self, other: &Duration) -> Option<Timespec> { let mut secs = self.tv_sec.checked_sub_unsigned(other.as_secs())?; // Similar to above, nanos can't overflow. @@ -203,7 +191,7 @@ impl Timespec { nsec += NSEC_PER_SEC as i32; secs = secs.checked_sub(1)?; } - Some(unsafe { Timespec::new_unchecked(secs, nsec as i64) }) + Some(unsafe { Timespec::new_unchecked(secs, nsec.into()) }) } #[allow(dead_code)] diff --git a/library/std/src/sys/pal/unix/weak.rs b/library/std/src/sys/pal/unix/weak.rs index c8cf75b876c..a3b980a3f3d 100644 --- a/library/std/src/sys/pal/unix/weak.rs +++ b/library/std/src/sys/pal/unix/weak.rs @@ -22,11 +22,24 @@ #![allow(dead_code, unused_macros)] #![forbid(unsafe_op_in_unsafe_fn)] -use crate::ffi::CStr; -use crate::marker::PhantomData; -use crate::sync::atomic::{self, Atomic, AtomicPtr, Ordering}; +use crate::ffi::{CStr, c_char, c_void}; +use crate::marker::{FnPtr, PhantomData}; +use crate::sync::atomic::{Atomic, AtomicPtr, Ordering}; use crate::{mem, ptr}; +// We currently only test `dlsym!`, but that doesn't work on all platforms, so +// we gate the tests to only the platforms where it is actually used. +// +// FIXME(joboet): add more tests, reorganise the whole module and get rid of +// `#[allow(dead_code, unused_macros)]`. +#[cfg(any( + target_vendor = "apple", + all(target_os = "linux", target_env = "gnu"), + target_os = "freebsd", +))] +#[cfg(test)] +mod tests; + // We can use true weak linkage on ELF targets. #[cfg(all(unix, not(target_vendor = "apple")))] pub(crate) macro weak { @@ -64,7 +77,7 @@ impl<F: Copy> ExternWeak<F> { pub(crate) macro dlsym { (fn $name:ident($($param:ident : $t:ty),* $(,)?) -> $ret:ty;) => ( - dlsym!( + dlsym!( #[link_name = stringify!($name)] fn $name($($param : $t),*) -> $ret; ); @@ -73,21 +86,39 @@ pub(crate) macro dlsym { #[link_name = $sym:expr] fn $name:ident($($param:ident : $t:ty),* $(,)?) -> $ret:ty; ) => ( - static DLSYM: DlsymWeak<unsafe extern "C" fn($($t),*) -> $ret> = - DlsymWeak::new(concat!($sym, '\0')); + static DLSYM: DlsymWeak<unsafe extern "C" fn($($t),*) -> $ret> = { + let Ok(name) = CStr::from_bytes_with_nul(concat!($sym, '\0').as_bytes()) else { + panic!("symbol name may not contain NUL") + }; + + // SAFETY: Whoever calls the function pointer returned by `get()` + // is responsible for ensuring that the signature is correct. Just + // like with extern blocks, this is syntactically enforced by making + // the function pointer be unsafe. + unsafe { DlsymWeak::new(name) } + }; + let $name = &DLSYM; ) } + pub(crate) struct DlsymWeak<F> { - name: &'static str, + /// A pointer to the nul-terminated name of the symbol. + // Use a pointer instead of `&'static CStr` to save space. + name: *const c_char, func: Atomic<*mut libc::c_void>, _marker: PhantomData<F>, } -impl<F> DlsymWeak<F> { - pub(crate) const fn new(name: &'static str) -> Self { +impl<F: FnPtr> DlsymWeak<F> { + /// # Safety + /// + /// If the signature of `F` does not match the signature of the symbol (if + /// it exists), calling the function pointer returned by `get()` is + /// undefined behaviour. + pub(crate) const unsafe fn new(name: &'static CStr) -> Self { DlsymWeak { - name, + name: name.as_ptr(), func: AtomicPtr::new(ptr::without_provenance_mut(1)), _marker: PhantomData, } @@ -95,62 +126,59 @@ impl<F> DlsymWeak<F> { #[inline] pub(crate) fn get(&self) -> Option<F> { - unsafe { - // Relaxed is fine here because we fence before reading through the - // pointer (see the comment below). - match self.func.load(Ordering::Relaxed) { - func if func.addr() == 1 => self.initialize(), - func if func.is_null() => None, - func => { - let func = mem::transmute_copy::<*mut libc::c_void, F>(&func); - // The caller is presumably going to read through this value - // (by calling the function we've dlsymed). This means we'd - // need to have loaded it with at least C11's consume - // ordering in order to be guaranteed that the data we read - // from the pointer isn't from before the pointer was - // stored. Rust has no equivalent to memory_order_consume, - // so we use an acquire fence (sorry, ARM). - // - // Now, in practice this likely isn't needed even on CPUs - // where relaxed and consume mean different things. The - // symbols we're loading are probably present (or not) at - // init, and even if they aren't the runtime dynamic loader - // is extremely likely have sufficient barriers internally - // (possibly implicitly, for example the ones provided by - // invoking `mprotect`). - // - // That said, none of that's *guaranteed*, and so we fence. - atomic::fence(Ordering::Acquire); - Some(func) - } - } + // The caller is presumably going to read through this value + // (by calling the function we've dlsymed). This means we'd + // need to have loaded it with at least C11's consume + // ordering in order to be guaranteed that the data we read + // from the pointer isn't from before the pointer was + // stored. Rust has no equivalent to memory_order_consume, + // so we use an acquire load (sorry, ARM). + // + // Now, in practice this likely isn't needed even on CPUs + // where relaxed and consume mean different things. The + // symbols we're loading are probably present (or not) at + // init, and even if they aren't the runtime dynamic loader + // is extremely likely have sufficient barriers internally + // (possibly implicitly, for example the ones provided by + // invoking `mprotect`). + // + // That said, none of that's *guaranteed*, so we use acquire. + match self.func.load(Ordering::Acquire) { + func if func.addr() == 1 => self.initialize(), + func if func.is_null() => None, + // SAFETY: + // `func` is not null and `F` implements `FnPtr`, thus this + // transmutation is well-defined. It is the responsibility of the + // creator of this `DlsymWeak` to ensure that calling the resulting + // function pointer does not result in undefined behaviour (though + // the `dlsym!` macro delegates this responsibility to the caller + // of the function by using `unsafe` function pointers). + // FIXME: use `transmute` once it stops complaining about generics. + func => Some(unsafe { mem::transmute_copy::<*mut c_void, F>(&func) }), } } // Cold because it should only happen during first-time initialization. #[cold] - unsafe fn initialize(&self) -> Option<F> { - assert_eq!(size_of::<F>(), size_of::<*mut libc::c_void>()); - - let val = unsafe { fetch(self.name) }; - // This synchronizes with the acquire fence in `get`. + fn initialize(&self) -> Option<F> { + // SAFETY: `self.name` was created from a `&'static CStr` and is + // therefore a valid C string pointer. + let val = unsafe { libc::dlsym(libc::RTLD_DEFAULT, self.name) }; + // This synchronizes with the acquire load in `get`. self.func.store(val, Ordering::Release); if val.is_null() { None } else { + // SAFETY: see the comment in `get`. + // FIXME: use `transmute` once it stops complaining about generics. Some(unsafe { mem::transmute_copy::<*mut libc::c_void, F>(&val) }) } } } -unsafe fn fetch(name: &str) -> *mut libc::c_void { - let name = match CStr::from_bytes_with_nul(name.as_bytes()) { - Ok(cstr) => cstr, - Err(..) => return ptr::null_mut(), - }; - unsafe { libc::dlsym(libc::RTLD_DEFAULT, name.as_ptr()) } -} +unsafe impl<F> Send for DlsymWeak<F> {} +unsafe impl<F> Sync for DlsymWeak<F> {} #[cfg(not(any(target_os = "linux", target_os = "android")))] pub(crate) macro syscall { diff --git a/library/std/src/sys/pal/unix/weak/tests.rs b/library/std/src/sys/pal/unix/weak/tests.rs new file mode 100644 index 00000000000..d807ba64e35 --- /dev/null +++ b/library/std/src/sys/pal/unix/weak/tests.rs @@ -0,0 +1,32 @@ +use super::*; + +#[test] +fn dlsym_existing() { + const TEST_STRING: &'static CStr = c"Ferris!"; + + // Try to find a symbol that definitely exists. + dlsym! { + fn strlen(cs: *const c_char) -> usize; + } + + dlsym! { + #[link_name = "strlen"] + fn custom_name(cs: *const c_char) -> usize; + } + + let strlen = strlen.get().unwrap(); + assert_eq!(unsafe { strlen(TEST_STRING.as_ptr()) }, TEST_STRING.count_bytes()); + + let custom_name = custom_name.get().unwrap(); + assert_eq!(unsafe { custom_name(TEST_STRING.as_ptr()) }, TEST_STRING.count_bytes()); +} + +#[test] +fn dlsym_missing() { + // Try to find a symbol that definitely does not exist. + dlsym! { + fn test_symbol_that_does_not_exist() -> i32; + } + + assert!(test_symbol_that_does_not_exist.get().is_none()); +} diff --git a/library/std/src/sys/pal/unsupported/time.rs b/library/std/src/sys/pal/unsupported/time.rs index 0c387917044..6d67b538a96 100644 --- a/library/std/src/sys/pal/unsupported/time.rs +++ b/library/std/src/sys/pal/unsupported/time.rs @@ -31,22 +31,15 @@ impl SystemTime { panic!("time not implemented on this platform") } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> { - // FIXME: ok_or_else with const closures - match self.0.checked_sub(other.0) { - Some(duration) => Ok(duration), - None => Err(other.0 - self.0), - } + pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> { + self.0.checked_sub(other.0).ok_or_else(|| other.0 - self.0) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> { + pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> { Some(SystemTime(self.0.checked_add(*other)?)) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> { + pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> { Some(SystemTime(self.0.checked_sub(*other)?)) } } diff --git a/library/std/src/sys/pal/wasip1/mod.rs b/library/std/src/sys/pal/wasip1/mod.rs index 61dd1c3f98b..ae5da3c1f77 100644 --- a/library/std/src/sys/pal/wasip1/mod.rs +++ b/library/std/src/sys/pal/wasip1/mod.rs @@ -20,7 +20,6 @@ pub mod futex; pub mod os; #[path = "../unsupported/pipe.rs"] pub mod pipe; -pub mod thread; pub mod time; #[path = "../unsupported/common.rs"] diff --git a/library/std/src/sys/pal/wasip1/thread.rs b/library/std/src/sys/pal/wasip1/thread.rs deleted file mode 100644 index e062b49bd7a..00000000000 --- a/library/std/src/sys/pal/wasip1/thread.rs +++ /dev/null @@ -1,214 +0,0 @@ -#![forbid(unsafe_op_in_unsafe_fn)] - -use crate::ffi::CStr; -use crate::num::NonZero; -use crate::time::{Duration, Instant}; -use crate::{io, mem}; - -cfg_select! { - target_feature = "atomics" => { - use crate::cmp; - use crate::ptr; - use crate::sys::os; - // Add a few symbols not in upstream `libc` just yet. - mod libc { - pub use crate::ffi; - pub use libc::*; - - // defined in wasi-libc - // https://github.com/WebAssembly/wasi-libc/blob/a6f871343313220b76009827ed0153586361c0d5/libc-top-half/musl/include/alltypes.h.in#L108 - #[repr(C)] - union pthread_attr_union { - __i: [ffi::c_int; if size_of::<ffi::c_long>() == 8 { 14 } else { 9 }], - __vi: [ffi::c_int; if size_of::<ffi::c_long>() == 8 { 14 } else { 9 }], - __s: [ffi::c_ulong; if size_of::<ffi::c_long>() == 8 { 7 } else { 9 }], - } - - #[repr(C)] - pub struct pthread_attr_t { - __u: pthread_attr_union, - } - - #[allow(non_camel_case_types)] - pub type pthread_t = *mut ffi::c_void; - - pub const _SC_NPROCESSORS_ONLN: ffi::c_int = 84; - - unsafe extern "C" { - pub fn pthread_create( - native: *mut pthread_t, - attr: *const pthread_attr_t, - f: extern "C" fn(*mut ffi::c_void) -> *mut ffi::c_void, - value: *mut ffi::c_void, - ) -> ffi::c_int; - pub fn pthread_join(native: pthread_t, value: *mut *mut ffi::c_void) -> ffi::c_int; - pub fn pthread_attr_init(attrp: *mut pthread_attr_t) -> ffi::c_int; - pub fn pthread_attr_setstacksize( - attr: *mut pthread_attr_t, - stack_size: libc::size_t, - ) -> ffi::c_int; - pub fn pthread_attr_destroy(attr: *mut pthread_attr_t) -> ffi::c_int; - pub fn pthread_detach(thread: pthread_t) -> ffi::c_int; - } - } - - pub struct Thread { - id: libc::pthread_t, - } - - impl Drop for Thread { - fn drop(&mut self) { - let ret = unsafe { libc::pthread_detach(self.id) }; - debug_assert_eq!(ret, 0); - } - } - } - _ => { - pub struct Thread(!); - } -} - -pub const DEFAULT_MIN_STACK_SIZE: usize = 1024 * 1024; - -impl Thread { - // unsafe: see thread::Builder::spawn_unchecked for safety requirements - cfg_select! { - target_feature = "atomics" => { - pub unsafe fn new(stack: usize, _name: Option<&str>, p: Box<dyn FnOnce()>) -> io::Result<Thread> { - let p = Box::into_raw(Box::new(p)); - let mut native: libc::pthread_t = unsafe { mem::zeroed() }; - let mut attr: libc::pthread_attr_t = unsafe { mem::zeroed() }; - assert_eq!(unsafe { libc::pthread_attr_init(&mut attr) }, 0); - - let stack_size = cmp::max(stack, DEFAULT_MIN_STACK_SIZE); - - match unsafe { libc::pthread_attr_setstacksize(&mut attr, stack_size) } { - 0 => {} - n => { - assert_eq!(n, libc::EINVAL); - // EINVAL means |stack_size| is either too small or not a - // multiple of the system page size. Because it's definitely - // >= PTHREAD_STACK_MIN, it must be an alignment issue. - // Round up to the nearest page and try again. - let page_size = os::page_size(); - let stack_size = - (stack_size + page_size - 1) & (-(page_size as isize - 1) as usize - 1); - assert_eq!(unsafe { libc::pthread_attr_setstacksize(&mut attr, stack_size) }, 0); - } - }; - - let ret = unsafe { libc::pthread_create(&mut native, &attr, thread_start, p as *mut _) }; - // Note: if the thread creation fails and this assert fails, then p will - // be leaked. However, an alternative design could cause double-free - // which is clearly worse. - assert_eq!(unsafe {libc::pthread_attr_destroy(&mut attr) }, 0); - - return if ret != 0 { - // The thread failed to start and as a result p was not consumed. Therefore, it is - // safe to reconstruct the box so that it gets deallocated. - unsafe { drop(Box::from_raw(p)); } - Err(io::Error::from_raw_os_error(ret)) - } else { - Ok(Thread { id: native }) - }; - - extern "C" fn thread_start(main: *mut libc::c_void) -> *mut libc::c_void { - unsafe { - // Finally, let's run some code. - Box::from_raw(main as *mut Box<dyn FnOnce()>)(); - } - ptr::null_mut() - } - } - } - _ => { - pub unsafe fn new(_stack: usize, _name: Option<&str>, _p: Box<dyn FnOnce()>) -> io::Result<Thread> { - crate::sys::unsupported() - } - } - } - - pub fn yield_now() { - let ret = unsafe { wasi::sched_yield() }; - debug_assert_eq!(ret, Ok(())); - } - - pub fn set_name(_name: &CStr) { - // nope - } - - pub fn sleep(dur: Duration) { - let mut nanos = dur.as_nanos(); - while nanos > 0 { - const USERDATA: wasi::Userdata = 0x0123_45678; - - let clock = wasi::SubscriptionClock { - id: wasi::CLOCKID_MONOTONIC, - timeout: u64::try_from(nanos).unwrap_or(u64::MAX), - precision: 0, - flags: 0, - }; - nanos -= u128::from(clock.timeout); - - let in_ = wasi::Subscription { - userdata: USERDATA, - u: wasi::SubscriptionU { tag: 0, u: wasi::SubscriptionUU { clock } }, - }; - unsafe { - let mut event: wasi::Event = mem::zeroed(); - let res = wasi::poll_oneoff(&in_, &mut event, 1); - match (res, event) { - ( - Ok(1), - wasi::Event { - userdata: USERDATA, - error: wasi::ERRNO_SUCCESS, - type_: wasi::EVENTTYPE_CLOCK, - .. - }, - ) => {} - _ => panic!("thread::sleep(): unexpected result of poll_oneoff"), - } - } - } - } - - pub fn sleep_until(deadline: Instant) { - let now = Instant::now(); - - if let Some(delay) = deadline.checked_duration_since(now) { - Self::sleep(delay); - } - } - - pub fn join(self) { - cfg_select! { - target_feature = "atomics" => { - let id = mem::ManuallyDrop::new(self).id; - let ret = unsafe { libc::pthread_join(id, ptr::null_mut()) }; - if ret != 0 { - rtabort!("failed to join thread: {}", io::Error::from_raw_os_error(ret)); - } - } - _ => { - self.0 - } - } - } -} - -pub(crate) fn current_os_id() -> Option<u64> { - None -} - -pub fn available_parallelism() -> io::Result<NonZero<usize>> { - cfg_select! { - target_feature = "atomics" => { - match unsafe { libc::sysconf(libc::_SC_NPROCESSORS_ONLN) } { - -1 => Err(io::Error::last_os_error()), - cpus => NonZero::new(cpus as usize).ok_or(io::Error::UNKNOWN_THREAD_COUNT), - } - } - _ => crate::sys::unsupported(), - } -} diff --git a/library/std/src/sys/pal/wasip1/time.rs b/library/std/src/sys/pal/wasip1/time.rs index 892661b312b..0d8d0b59ac1 100644 --- a/library/std/src/sys/pal/wasip1/time.rs +++ b/library/std/src/sys/pal/wasip1/time.rs @@ -43,34 +43,23 @@ impl SystemTime { SystemTime(current_time(wasi::CLOCKID_REALTIME)) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn from_wasi_timestamp(ts: wasi::Timestamp) -> SystemTime { + pub fn from_wasi_timestamp(ts: wasi::Timestamp) -> SystemTime { SystemTime(Duration::from_nanos(ts)) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn to_wasi_timestamp(&self) -> Option<wasi::Timestamp> { - // FIXME: const TryInto - let ns = self.0.as_nanos(); - if ns <= u64::MAX as u128 { Some(ns as u64) } else { None } + pub fn to_wasi_timestamp(&self) -> Option<wasi::Timestamp> { + self.0.as_nanos().try_into().ok() } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> { - // FIXME: ok_or_else with const closures - match self.0.checked_sub(other.0) { - Some(duration) => Ok(duration), - None => Err(other.0 - self.0), - } + pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> { + self.0.checked_sub(other.0).ok_or_else(|| other.0 - self.0) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> { + pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> { Some(SystemTime(self.0.checked_add(*other)?)) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> { + pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> { Some(SystemTime(self.0.checked_sub(*other)?)) } } diff --git a/library/std/src/sys/pal/wasip2/mod.rs b/library/std/src/sys/pal/wasip2/mod.rs index 5f3fb6d6ddf..c1d89da2677 100644 --- a/library/std/src/sys/pal/wasip2/mod.rs +++ b/library/std/src/sys/pal/wasip2/mod.rs @@ -14,7 +14,6 @@ pub mod futex; pub mod os; #[path = "../unsupported/pipe.rs"] pub mod pipe; -pub mod thread; pub mod time; #[path = "../unsupported/common.rs"] diff --git a/library/std/src/sys/pal/wasip2/thread.rs b/library/std/src/sys/pal/wasip2/thread.rs deleted file mode 100644 index ad52918f15a..00000000000 --- a/library/std/src/sys/pal/wasip2/thread.rs +++ /dev/null @@ -1,73 +0,0 @@ -use crate::ffi::CStr; -use crate::io; -use crate::num::NonZero; -use crate::time::{Duration, Instant}; - -pub struct Thread(!); - -pub const DEFAULT_MIN_STACK_SIZE: usize = 1024 * 1024; - -impl Thread { - pub unsafe fn new( - _stack: usize, - _name: Option<&str>, - _p: Box<dyn FnOnce()>, - ) -> io::Result<Thread> { - // Note that unlike WASIp1 even if the wasm `atomics` feature is enabled - // there is no support for threads, not even experimentally, not even in - // wasi-libc. Thus this is unconditionally unsupported. - crate::sys::unsupported() - } - - pub fn yield_now() { - // no API for this in WASIp2, but there's also no threads, so that's - // sort of expected. - } - - pub fn set_name(_name: &CStr) { - // nope - } - - pub fn sleep(dur: Duration) { - // Sleep in increments of `u64::MAX` nanoseconds until the `dur` is - // entirely drained. - let mut remaining = dur.as_nanos(); - while remaining > 0 { - let amt = u64::try_from(remaining).unwrap_or(u64::MAX); - wasip2::clocks::monotonic_clock::subscribe_duration(amt).block(); - remaining -= u128::from(amt); - } - } - - pub fn sleep_until(deadline: Instant) { - match u64::try_from(deadline.into_inner().as_duration().as_nanos()) { - // If the point in time we're sleeping to fits within a 64-bit - // number of nanoseconds then directly use `subscribe_instant`. - Ok(deadline) => { - wasip2::clocks::monotonic_clock::subscribe_instant(deadline).block(); - } - // ... otherwise we're sleeping for 500+ years relative to the - // "start" of what the system is using as a clock so speed/accuracy - // is not so much of a concern. Use `sleep` instead. - Err(_) => { - let now = Instant::now(); - - if let Some(delay) = deadline.checked_duration_since(now) { - Self::sleep(delay); - } - } - } - } - - pub fn join(self) { - self.0 - } -} - -pub(crate) fn current_os_id() -> Option<u64> { - None -} - -pub fn available_parallelism() -> io::Result<NonZero<usize>> { - crate::sys::unsupported() -} diff --git a/library/std/src/sys/pal/wasip2/time.rs b/library/std/src/sys/pal/wasip2/time.rs index f1f6839774b..43489183994 100644 --- a/library/std/src/sys/pal/wasip2/time.rs +++ b/library/std/src/sys/pal/wasip2/time.rs @@ -25,7 +25,7 @@ impl Instant { Some(Instant(self.0.checked_sub(*other)?)) } - pub(super) fn as_duration(&self) -> &Duration { + pub(crate) fn as_duration(&self) -> &Duration { &self.0 } } @@ -36,34 +36,23 @@ impl SystemTime { SystemTime(Duration::new(now.seconds, now.nanoseconds)) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn from_wasi_timestamp(ts: wasi::Timestamp) -> SystemTime { + pub fn from_wasi_timestamp(ts: wasi::Timestamp) -> SystemTime { SystemTime(Duration::from_nanos(ts)) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn to_wasi_timestamp(&self) -> Option<wasi::Timestamp> { - // FIXME: const TryInto - let ns = self.0.as_nanos(); - if ns <= u64::MAX as u128 { Some(ns as u64) } else { None } + pub fn to_wasi_timestamp(&self) -> Option<wasi::Timestamp> { + self.0.as_nanos().try_into().ok() } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> { - // FIXME: ok_or_else with const closures - match self.0.checked_sub(other.0) { - Some(duration) => Ok(duration), - None => Err(other.0 - self.0), - } + pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> { + self.0.checked_sub(other.0).ok_or_else(|| other.0 - self.0) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> { + pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> { Some(SystemTime(self.0.checked_add(*other)?)) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> { + pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> { Some(SystemTime(self.0.checked_sub(*other)?)) } } diff --git a/library/std/src/sys/pal/wasm/atomics/thread.rs b/library/std/src/sys/pal/wasm/atomics/thread.rs deleted file mode 100644 index 42a7dbdf8b8..00000000000 --- a/library/std/src/sys/pal/wasm/atomics/thread.rs +++ /dev/null @@ -1,75 +0,0 @@ -use crate::ffi::CStr; -use crate::io; -use crate::num::NonZero; -use crate::sys::unsupported; -use crate::time::{Duration, Instant}; - -pub struct Thread(!); - -pub const DEFAULT_MIN_STACK_SIZE: usize = 1024 * 1024; - -impl Thread { - // unsafe: see thread::Builder::spawn_unchecked for safety requirements - pub unsafe fn new( - _stack: usize, - _name: Option<&str>, - _p: Box<dyn FnOnce()>, - ) -> io::Result<Thread> { - unsupported() - } - - pub fn yield_now() {} - - pub fn set_name(_name: &CStr) {} - - pub fn sleep(dur: Duration) { - #[cfg(target_arch = "wasm32")] - use core::arch::wasm32 as wasm; - #[cfg(target_arch = "wasm64")] - use core::arch::wasm64 as wasm; - - use crate::cmp; - - // Use an atomic wait to block the current thread artificially with a - // timeout listed. Note that we should never be notified (return value - // of 0) or our comparison should never fail (return value of 1) so we - // should always only resume execution through a timeout (return value - // 2). - let mut nanos = dur.as_nanos(); - while nanos > 0 { - let amt = cmp::min(i64::MAX as u128, nanos); - let mut x = 0; - let val = unsafe { wasm::memory_atomic_wait32(&mut x, 0, amt as i64) }; - debug_assert_eq!(val, 2); - nanos -= amt; - } - } - - pub fn sleep_until(deadline: Instant) { - let now = Instant::now(); - - if let Some(delay) = deadline.checked_duration_since(now) { - Self::sleep(delay); - } - } - - pub fn join(self) {} -} - -pub(crate) fn current_os_id() -> Option<u64> { - None -} - -pub fn available_parallelism() -> io::Result<NonZero<usize>> { - unsupported() -} - -pub mod guard { - pub type Guard = !; - pub unsafe fn current() -> Option<Guard> { - None - } - pub unsafe fn init() -> Option<Guard> { - None - } -} diff --git a/library/std/src/sys/pal/wasm/mod.rs b/library/std/src/sys/pal/wasm/mod.rs index 346c9ff88c9..a20cd0e9ac7 100644 --- a/library/std/src/sys/pal/wasm/mod.rs +++ b/library/std/src/sys/pal/wasm/mod.rs @@ -23,18 +23,9 @@ pub mod pipe; #[path = "../unsupported/time.rs"] pub mod time; -cfg_select! { - target_feature = "atomics" => { - #[path = "atomics/futex.rs"] - pub mod futex; - #[path = "atomics/thread.rs"] - pub mod thread; - } - _ => { - #[path = "../unsupported/thread.rs"] - pub mod thread; - } -} +#[cfg(target_feature = "atomics")] +#[path = "atomics/futex.rs"] +pub mod futex; #[path = "../unsupported/common.rs"] #[deny(unsafe_op_in_unsafe_fn)] diff --git a/library/std/src/sys/pal/windows/mod.rs b/library/std/src/sys/pal/windows/mod.rs index 3b6a86cbc8f..3357946b8f7 100644 --- a/library/std/src/sys/pal/windows/mod.rs +++ b/library/std/src/sys/pal/windows/mod.rs @@ -20,7 +20,6 @@ pub mod futex; pub mod handle; pub mod os; pub mod pipe; -pub mod thread; pub mod time; cfg_select! { not(target_vendor = "uwp") => { @@ -48,9 +47,9 @@ pub unsafe fn init(_argc: isize, _argv: *const *const u8, _sigpipe: u8) { unsafe { stack_overflow::init(); - // Normally, `thread::spawn` will call `Thread::set_name` but since this thread already + // Normally, `thread::spawn` will call `set_name` but since this thread already // exists, we have to call it ourselves. - thread::Thread::set_name_wide(wide_str!("main")); + crate::sys::thread::set_name_wide(wide_str!("main")); } } diff --git a/library/std/src/sys/pal/windows/time.rs b/library/std/src/sys/pal/windows/time.rs index a948c07e0a3..0d31b80e56a 100644 --- a/library/std/src/sys/pal/windows/time.rs +++ b/library/std/src/sys/pal/windows/time.rs @@ -72,8 +72,7 @@ impl SystemTime { } } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - const fn from_intervals(intervals: i64) -> SystemTime { + fn from_intervals(intervals: i64) -> SystemTime { SystemTime { t: c::FILETIME { dwLowDateTime: intervals as u32, @@ -82,13 +81,11 @@ impl SystemTime { } } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - const fn intervals(&self) -> i64 { + fn intervals(&self) -> i64 { (self.t.dwLowDateTime as i64) | ((self.t.dwHighDateTime as i64) << 32) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> { + pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> { let me = self.intervals(); let other = other.intervals(); if me >= other { @@ -98,14 +95,12 @@ impl SystemTime { } } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> { + pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> { let intervals = self.intervals().checked_add(checked_dur2intervals(other)?)?; Some(SystemTime::from_intervals(intervals)) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> { + pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> { let intervals = self.intervals().checked_sub(checked_dur2intervals(other)?)?; Some(SystemTime::from_intervals(intervals)) } @@ -155,18 +150,15 @@ impl Hash for SystemTime { } } -#[rustc_const_unstable(feature = "const_system_time", issue = "144517")] -const fn checked_dur2intervals(dur: &Duration) -> Option<i64> { - // FIXME: const TryInto - let secs = dur - .as_secs() +fn checked_dur2intervals(dur: &Duration) -> Option<i64> { + dur.as_secs() .checked_mul(INTERVALS_PER_SEC)? - .checked_add(dur.subsec_nanos() as u64 / 100)?; - if secs <= i64::MAX as u64 { Some(secs.cast_signed()) } else { None } + .checked_add(dur.subsec_nanos() as u64 / 100)? + .try_into() + .ok() } -#[rustc_const_unstable(feature = "const_system_time", issue = "144517")] -const fn intervals2dur(intervals: u64) -> Duration { +fn intervals2dur(intervals: u64) -> Duration { Duration::new(intervals / INTERVALS_PER_SEC, ((intervals % INTERVALS_PER_SEC) * 100) as u32) } @@ -232,7 +224,7 @@ mod perf_counter { } /// A timer you can wait on. -pub(super) struct WaitableTimer { +pub(crate) struct WaitableTimer { handle: c::HANDLE, } impl WaitableTimer { diff --git a/library/std/src/sys/pal/xous/mod.rs b/library/std/src/sys/pal/xous/mod.rs index 042c4ff862f..e673157e0eb 100644 --- a/library/std/src/sys/pal/xous/mod.rs +++ b/library/std/src/sys/pal/xous/mod.rs @@ -5,7 +5,6 @@ use crate::os::xous::ffi::exit; pub mod os; #[path = "../unsupported/pipe.rs"] pub mod pipe; -pub mod thread; pub mod time; #[path = "../unsupported/common.rs"] diff --git a/library/std/src/sys/pal/xous/time.rs b/library/std/src/sys/pal/xous/time.rs index d737416436e..ae8be81c0b7 100644 --- a/library/std/src/sys/pal/xous/time.rs +++ b/library/std/src/sys/pal/xous/time.rs @@ -43,22 +43,15 @@ impl SystemTime { SystemTime { 0: Duration::from_millis((upper as u64) << 32 | lower as u64) } } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> { - // FIXME: ok_or_else with const closures - match self.0.checked_sub(other.0) { - Some(duration) => Ok(duration), - None => Err(other.0 - self.0), - } + pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> { + self.0.checked_sub(other.0).ok_or_else(|| other.0 - self.0) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> { + pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> { Some(SystemTime(self.0.checked_add(*other)?)) } - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> { + pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> { Some(SystemTime(self.0.checked_sub(*other)?)) } } diff --git a/library/std/src/sys/platform_version/darwin/tests.rs b/library/std/src/sys/platform_version/darwin/tests.rs index eecd58ec79e..17b2cc18ec0 100644 --- a/library/std/src/sys/platform_version/darwin/tests.rs +++ b/library/std/src/sys/platform_version/darwin/tests.rs @@ -35,9 +35,9 @@ fn compare_against_sw_vers() { assert_eq!(__isOSVersionAtLeast(major, minor, subminor), 1); // One lower is available - assert_eq!(__isOSVersionAtLeast(major, minor, subminor.saturating_sub(1)), 1); - assert_eq!(__isOSVersionAtLeast(major, minor.saturating_sub(1), subminor), 1); - assert_eq!(__isOSVersionAtLeast(major.saturating_sub(1), minor, subminor), 1); + assert_eq!(__isOSVersionAtLeast(major, minor, (subminor as u32).saturating_sub(1) as i32), 1); + assert_eq!(__isOSVersionAtLeast(major, (minor as u32).saturating_sub(1) as i32, subminor), 1); + assert_eq!(__isOSVersionAtLeast((major as u32).saturating_sub(1) as i32, minor, subminor), 1); // One higher isn't available assert_eq!(__isOSVersionAtLeast(major, minor, subminor + 1), 0); diff --git a/library/std/src/sys/sync/once/queue.rs b/library/std/src/sys/sync/once/queue.rs index 49e15d65f25..17d99cdb385 100644 --- a/library/std/src/sys/sync/once/queue.rs +++ b/library/std/src/sys/sync/once/queue.rs @@ -276,7 +276,9 @@ fn wait( // If the managing thread happens to signal and unpark us before we // can park ourselves, the result could be this thread never gets // unparked. Luckily `park` comes with the guarantee that if it got - // an `unpark` just before on an unparked thread it does not park. + // an `unpark` just before on an unparked thread it does not park. Crucially, we know + // the `unpark` must have happened between the `compare_exchange_weak` above and here, + // and there's no other `park` in that code that could steal our token. // SAFETY: we retrieved this handle on the current thread above. unsafe { node.thread.park() } } diff --git a/library/std/src/sys/pal/hermit/thread.rs b/library/std/src/sys/thread/hermit.rs index cc4734b6819..4d9f3b114c2 100644 --- a/library/std/src/sys/pal/hermit/thread.rs +++ b/library/std/src/sys/thread/hermit.rs @@ -1,10 +1,5 @@ -#![allow(dead_code)] - -use super::hermit_abi; -use crate::ffi::CStr; -use crate::mem::ManuallyDrop; use crate::num::NonZero; -use crate::time::{Duration, Instant}; +use crate::time::Duration; use crate::{io, ptr}; pub type Tid = hermit_abi::Tid; @@ -68,57 +63,30 @@ impl Thread { } } - #[inline] - pub fn yield_now() { - unsafe { - hermit_abi::yield_now(); - } - } - - #[inline] - pub fn set_name(_name: &CStr) { - // nope - } - - #[inline] - pub fn sleep(dur: Duration) { - let micros = dur.as_micros() + if dur.subsec_nanos() % 1_000 > 0 { 1 } else { 0 }; - let micros = u64::try_from(micros).unwrap_or(u64::MAX); - - unsafe { - hermit_abi::usleep(micros); - } - } - - pub fn sleep_until(deadline: Instant) { - let now = Instant::now(); - - if let Some(delay) = deadline.checked_duration_since(now) { - Self::sleep(delay); - } - } - pub fn join(self) { unsafe { let _ = hermit_abi::join(self.tid); } } +} - #[inline] - pub fn id(&self) -> Tid { - self.tid - } - - #[inline] - pub fn into_id(self) -> Tid { - ManuallyDrop::new(self).tid - } +pub fn available_parallelism() -> io::Result<NonZero<usize>> { + unsafe { Ok(NonZero::new_unchecked(hermit_abi::available_parallelism())) } } -pub(crate) fn current_os_id() -> Option<u64> { - None +#[inline] +pub fn sleep(dur: Duration) { + let micros = dur.as_micros() + if dur.subsec_nanos() % 1_000 > 0 { 1 } else { 0 }; + let micros = u64::try_from(micros).unwrap_or(u64::MAX); + + unsafe { + hermit_abi::usleep(micros); + } } -pub fn available_parallelism() -> io::Result<NonZero<usize>> { - unsafe { Ok(NonZero::new_unchecked(hermit_abi::available_parallelism())) } +#[inline] +pub fn yield_now() { + unsafe { + hermit_abi::yield_now(); + } } diff --git a/library/std/src/sys/thread/mod.rs b/library/std/src/sys/thread/mod.rs new file mode 100644 index 00000000000..6bb7fc1a20e --- /dev/null +++ b/library/std/src/sys/thread/mod.rs @@ -0,0 +1,152 @@ +cfg_select! { + target_os = "hermit" => { + mod hermit; + pub use hermit::{Thread, available_parallelism, sleep, yield_now, DEFAULT_MIN_STACK_SIZE}; + #[expect(dead_code)] + mod unsupported; + pub use unsupported::{current_os_id, set_name}; + } + all(target_vendor = "fortanix", target_env = "sgx") => { + mod sgx; + pub use sgx::{Thread, current_os_id, sleep, yield_now, DEFAULT_MIN_STACK_SIZE}; + + // SGX should protect in-enclave data from outside attackers, so there + // must not be any data leakage to the OS, particularly no 1-1 mapping + // between SGX thread names and OS thread names. Hence `set_name` is + // intentionally a no-op. + // + // Note that the internally visible SGX thread name is already provided + // by the platform-agnostic Rust thread code. This can be observed in + // the [`std::thread::tests::test_named_thread`] test, which succeeds + // as-is with the SGX target. + #[expect(dead_code)] + mod unsupported; + pub use unsupported::{available_parallelism, set_name}; + } + target_os = "solid_asp3" => { + mod solid; + pub use solid::{Thread, sleep, yield_now, DEFAULT_MIN_STACK_SIZE}; + #[expect(dead_code)] + mod unsupported; + pub use unsupported::{available_parallelism, current_os_id, set_name}; + } + target_os = "teeos" => { + mod teeos; + pub use teeos::{Thread, sleep, yield_now, DEFAULT_MIN_STACK_SIZE}; + #[expect(dead_code)] + mod unsupported; + pub use unsupported::{available_parallelism, current_os_id, set_name}; + } + target_os = "uefi" => { + mod uefi; + pub use uefi::{available_parallelism, sleep}; + #[expect(dead_code)] + mod unsupported; + pub use unsupported::{Thread, current_os_id, set_name, yield_now, DEFAULT_MIN_STACK_SIZE}; + } + target_family = "unix" => { + mod unix; + pub use unix::{Thread, available_parallelism, current_os_id, sleep, yield_now, DEFAULT_MIN_STACK_SIZE}; + #[cfg(not(any( + target_env = "newlib", + target_os = "l4re", + target_os = "emscripten", + target_os = "redox", + target_os = "hurd", + target_os = "aix", + )))] + pub use unix::set_name; + #[cfg(any( + target_os = "freebsd", + target_os = "netbsd", + target_os = "linux", + target_os = "android", + target_os = "solaris", + target_os = "illumos", + target_os = "dragonfly", + target_os = "hurd", + target_os = "fuchsia", + target_os = "vxworks", + ))] + pub use unix::sleep_until; + #[expect(dead_code)] + mod unsupported; + #[cfg(any( + target_env = "newlib", + target_os = "l4re", + target_os = "emscripten", + target_os = "redox", + target_os = "hurd", + target_os = "aix", + ))] + pub use unsupported::set_name; + } + all(target_os = "wasi", target_env = "p1") => { + mod wasip1; + pub use wasip1::{DEFAULT_MIN_STACK_SIZE, sleep, yield_now}; + #[cfg(target_feature = "atomics")] + pub use wasip1::{Thread, available_parallelism}; + #[expect(dead_code)] + mod unsupported; + pub use unsupported::{current_os_id, set_name}; + #[cfg(not(target_feature = "atomics"))] + pub use unsupported::{Thread, available_parallelism}; + } + all(target_os = "wasi", target_env = "p2") => { + mod wasip2; + pub use wasip2::{sleep, sleep_until}; + #[expect(dead_code)] + mod unsupported; + // Note that unlike WASIp1 even if the wasm `atomics` feature is enabled + // there is no support for threads, not even experimentally, not even in + // wasi-libc. Thus this is unconditionally unsupported. + pub use unsupported::{Thread, available_parallelism, current_os_id, set_name, yield_now, DEFAULT_MIN_STACK_SIZE}; + } + all(target_family = "wasm", target_feature = "atomics") => { + mod wasm; + pub use wasm::sleep; + + #[expect(dead_code)] + mod unsupported; + pub use unsupported::{Thread, available_parallelism, current_os_id, set_name, yield_now, DEFAULT_MIN_STACK_SIZE}; + } + target_os = "windows" => { + mod windows; + pub use windows::{Thread, available_parallelism, current_os_id, set_name, set_name_wide, sleep, yield_now, DEFAULT_MIN_STACK_SIZE}; + } + target_os = "xous" => { + mod xous; + pub use xous::{Thread, available_parallelism, sleep, yield_now, DEFAULT_MIN_STACK_SIZE}; + + #[expect(dead_code)] + mod unsupported; + pub use unsupported::{current_os_id, set_name}; + } + _ => { + mod unsupported; + pub use unsupported::{Thread, available_parallelism, current_os_id, set_name, sleep, yield_now, DEFAULT_MIN_STACK_SIZE}; + } +} + +#[cfg(not(any( + target_os = "freebsd", + target_os = "netbsd", + target_os = "linux", + target_os = "android", + target_os = "solaris", + target_os = "illumos", + target_os = "dragonfly", + target_os = "hurd", + target_os = "fuchsia", + target_os = "vxworks", + all(target_os = "wasi", target_env = "p2"), +)))] +pub fn sleep_until(deadline: crate::time::Instant) { + use crate::time::Instant; + + let now = Instant::now(); + + if let Some(delay) = deadline.checked_duration_since(now) { + sleep(delay); + } +} diff --git a/library/std/src/sys/pal/sgx/thread.rs b/library/std/src/sys/thread/sgx.rs index 1f613badcd7..f20ef7d86b9 100644 --- a/library/std/src/sys/pal/sgx/thread.rs +++ b/library/std/src/sys/thread/sgx.rs @@ -1,11 +1,8 @@ #![cfg_attr(test, allow(dead_code))] // why is this necessary? -use super::abi::{thread, usercalls}; -use super::unsupported; -use crate::ffi::CStr; use crate::io; -use crate::num::NonZero; -use crate::time::{Duration, Instant}; +use crate::sys::pal::abi::{thread, usercalls}; +use crate::time::Duration; pub struct Thread(task_queue::JoinHandle); @@ -108,51 +105,27 @@ impl Thread { Ok(Thread(handle)) } - pub(super) fn entry() -> JoinNotifier { + pub(crate) fn entry() -> JoinNotifier { let mut pending_tasks = task_queue::lock(); let task = rtunwrap!(Some, pending_tasks.pop()); drop(pending_tasks); // make sure to not hold the task queue lock longer than necessary task.run() } - pub fn yield_now() { - let wait_error = rtunwrap!(Err, usercalls::wait(0, usercalls::raw::WAIT_NO)); - rtassert!(wait_error.kind() == io::ErrorKind::WouldBlock); - } - - /// SGX should protect in-enclave data from the outside (attacker), - /// so there should be no data leakage to the OS, - /// and therefore also no 1-1 mapping between SGX thread names and OS thread names. - /// - /// This is why the method is intentionally No-Op. - pub fn set_name(_name: &CStr) { - // Note that the internally visible SGX thread name is already provided - // by the platform-agnostic (target-agnostic) Rust thread code. - // This can be observed in the [`std::thread::tests::test_named_thread`] test, - // which succeeds as-is with the SGX target. - } - - pub fn sleep(dur: Duration) { - usercalls::wait_timeout(0, dur, || true); - } - - pub fn sleep_until(deadline: Instant) { - let now = Instant::now(); - - if let Some(delay) = deadline.checked_duration_since(now) { - Self::sleep(delay); - } - } - pub fn join(self) { self.0.wait(); } } -pub(crate) fn current_os_id() -> Option<u64> { +pub fn current_os_id() -> Option<u64> { Some(thread::current().addr().get() as u64) } -pub fn available_parallelism() -> io::Result<NonZero<usize>> { - unsupported() +pub fn sleep(dur: Duration) { + usercalls::wait_timeout(0, dur, || true); +} + +pub fn yield_now() { + let wait_error = rtunwrap!(Err, usercalls::wait(0, usercalls::raw::WAIT_NO)); + rtassert!(wait_error.kind() == io::ErrorKind::WouldBlock); } diff --git a/library/std/src/sys/pal/itron/thread.rs b/library/std/src/sys/thread/solid.rs index 4e14cb3cbca..46a84faa802 100644 --- a/library/std/src/sys/pal/itron/thread.rs +++ b/library/std/src/sys/thread/solid.rs @@ -1,16 +1,14 @@ //! Thread implementation backed by μITRON tasks. Assumes `acre_tsk` and //! `exd_tsk` are available. -use super::error::{ItronError, expect_success, expect_success_aborting}; -use super::time::dur2reltims; -use super::{abi, task}; use crate::cell::UnsafeCell; -use crate::ffi::CStr; use crate::mem::ManuallyDrop; -use crate::num::NonZero; use crate::ptr::NonNull; use crate::sync::atomic::{Atomic, AtomicUsize, Ordering}; -use crate::time::{Duration, Instant}; +use crate::sys::pal::itron::error::{ItronError, expect_success, expect_success_aborting}; +use crate::sys::pal::itron::time::dur2reltims; +use crate::sys::pal::itron::{abi, task}; +use crate::time::Duration; use crate::{hint, io}; pub struct Thread { @@ -195,28 +193,6 @@ impl Thread { Ok(Self { p_inner, task: new_task }) } - pub fn yield_now() { - expect_success(unsafe { abi::rot_rdq(abi::TPRI_SELF) }, &"rot_rdq"); - } - - pub fn set_name(_name: &CStr) { - // nope - } - - pub fn sleep(dur: Duration) { - for timeout in dur2reltims(dur) { - expect_success(unsafe { abi::dly_tsk(timeout) }, &"dly_tsk"); - } - } - - pub fn sleep_until(deadline: Instant) { - let now = Instant::now(); - - if let Some(delay) = deadline.checked_duration_since(now) { - Self::sleep(delay); - } - } - pub fn join(self) { // Safety: `ThreadInner` is alive at this point let inner = unsafe { self.p_inner.as_ref() }; @@ -361,10 +337,12 @@ unsafe fn terminate_and_delete_current_task() -> ! { unsafe { crate::hint::unreachable_unchecked() }; } -pub(crate) fn current_os_id() -> Option<u64> { - None +pub fn yield_now() { + expect_success(unsafe { abi::rot_rdq(abi::TPRI_SELF) }, &"rot_rdq"); } -pub fn available_parallelism() -> io::Result<NonZero<usize>> { - super::unsupported() +pub fn sleep(dur: Duration) { + for timeout in dur2reltims(dur) { + expect_success(unsafe { abi::dly_tsk(timeout) }, &"dly_tsk"); + } } diff --git a/library/std/src/sys/pal/teeos/thread.rs b/library/std/src/sys/thread/teeos.rs index 1812d11e692..cad100395c9 100644 --- a/library/std/src/sys/pal/teeos/thread.rs +++ b/library/std/src/sys/thread/teeos.rs @@ -1,12 +1,18 @@ -use crate::ffi::CStr; use crate::mem::{self, ManuallyDrop}; -use crate::num::NonZero; use crate::sys::os; -use crate::time::{Duration, Instant}; +use crate::time::Duration; use crate::{cmp, io, ptr}; pub const DEFAULT_MIN_STACK_SIZE: usize = 8 * 1024; +unsafe extern "C" { + safe fn TEE_Wait(timeout: u32) -> u32; +} + +fn min_stack_size(_: *const libc::pthread_attr_t) -> usize { + libc::PTHREAD_STACK_MIN.try_into().expect("Infallible") +} + pub struct Thread { id: libc::pthread_t, } @@ -16,10 +22,6 @@ pub struct Thread { unsafe impl Send for Thread {} unsafe impl Sync for Thread {} -unsafe extern "C" { - pub fn TEE_Wait(timeout: u32) -> u32; -} - impl Thread { // unsafe: see thread::Builder::spawn_unchecked for safety requirements pub unsafe fn new( @@ -74,7 +76,7 @@ impl Thread { } else { // The new thread will start running earliest after the next yield. // We add a yield here, so that the user does not have to. - Thread::yield_now(); + yield_now(); Ok(Thread { id: native }) }; @@ -91,36 +93,6 @@ impl Thread { } } - pub fn yield_now() { - let ret = unsafe { libc::sched_yield() }; - debug_assert_eq!(ret, 0); - } - - /// This does not do anything on teeos - pub fn set_name(_name: &CStr) { - // Both pthread_setname_np and prctl are not available to the TA, - // so we can't implement this currently. If the need arises please - // contact the teeos rustzone team. - } - - /// only main thread could wait for sometime in teeos - pub fn sleep(dur: Duration) { - let sleep_millis = dur.as_millis(); - let final_sleep: u32 = - if sleep_millis >= u32::MAX as u128 { u32::MAX } else { sleep_millis as u32 }; - unsafe { - let _ = TEE_Wait(final_sleep); - } - } - - pub fn sleep_until(deadline: Instant) { - let now = Instant::now(); - - if let Some(delay) = deadline.checked_duration_since(now) { - Self::sleep(delay); - } - } - /// must join, because no pthread_detach supported pub fn join(self) { let id = self.into_id(); @@ -128,10 +100,6 @@ impl Thread { assert!(ret == 0, "failed to join thread: {}", io::Error::from_raw_os_error(ret)); } - pub fn id(&self) -> libc::pthread_t { - self.id - } - pub fn into_id(self) -> libc::pthread_t { ManuallyDrop::new(self).id } @@ -144,16 +112,15 @@ impl Drop for Thread { } } -pub(crate) fn current_os_id() -> Option<u64> { - None -} - -// Note: Both `sched_getaffinity` and `sysconf` are available but not functional on -// teeos, so this function always returns an Error! -pub fn available_parallelism() -> io::Result<NonZero<usize>> { - Err(io::Error::UNKNOWN_THREAD_COUNT) +pub fn yield_now() { + let ret = unsafe { libc::sched_yield() }; + debug_assert_eq!(ret, 0); } -fn min_stack_size(_: *const libc::pthread_attr_t) -> usize { - libc::PTHREAD_STACK_MIN.try_into().expect("Infallible") +/// only main thread could wait for sometime in teeos +pub fn sleep(dur: Duration) { + let sleep_millis = dur.as_millis(); + let final_sleep: u32 = + if sleep_millis >= u32::MAX as u128 { u32::MAX } else { sleep_millis as u32 }; + TEE_Wait(final_sleep); } diff --git a/library/std/src/sys/thread/uefi.rs b/library/std/src/sys/thread/uefi.rs new file mode 100644 index 00000000000..94f67d7ace2 --- /dev/null +++ b/library/std/src/sys/thread/uefi.rs @@ -0,0 +1,25 @@ +use crate::io; +use crate::num::NonZero; +use crate::ptr::NonNull; +use crate::time::Duration; + +pub fn available_parallelism() -> io::Result<NonZero<usize>> { + // UEFI is single threaded + Ok(NonZero::new(1).unwrap()) +} + +pub fn sleep(dur: Duration) { + let boot_services: NonNull<r_efi::efi::BootServices> = + crate::os::uefi::env::boot_services().expect("can't sleep").cast(); + let mut dur_ms = dur.as_micros(); + // ceil up to the nearest microsecond + if dur.subsec_nanos() % 1000 > 0 { + dur_ms += 1; + } + + while dur_ms > 0 { + let ms = crate::cmp::min(dur_ms, usize::MAX as u128); + let _ = unsafe { ((*boot_services.as_ptr()).stall)(ms as usize) }; + dur_ms -= ms; + } +} diff --git a/library/std/src/sys/pal/unix/thread.rs b/library/std/src/sys/thread/unix.rs index 3389b8c0c8a..2d2c4f90212 100644 --- a/library/std/src/sys/pal/unix/thread.rs +++ b/library/std/src/sys/thread/unix.rs @@ -1,3 +1,11 @@ +#[cfg(not(any( + target_env = "newlib", + target_os = "l4re", + target_os = "emscripten", + target_os = "redox", + target_os = "hurd", + target_os = "aix", +)))] use crate::ffi::CStr; use crate::mem::{self, ManuallyDrop}; use crate::num::NonZero; @@ -6,7 +14,7 @@ use crate::sys::weak::dlsym; #[cfg(any(target_os = "solaris", target_os = "illumos", target_os = "nto",))] use crate::sys::weak::weak; use crate::sys::{os, stack_overflow}; -use crate::time::{Duration, Instant}; +use crate::time::Duration; use crate::{cmp, io, ptr}; #[cfg(not(any( target_os = "l4re", @@ -121,273 +129,6 @@ impl Thread { } } - pub fn yield_now() { - let ret = unsafe { libc::sched_yield() }; - debug_assert_eq!(ret, 0); - } - - #[cfg(target_os = "android")] - pub fn set_name(name: &CStr) { - const PR_SET_NAME: libc::c_int = 15; - unsafe { - let res = libc::prctl( - PR_SET_NAME, - name.as_ptr(), - 0 as libc::c_ulong, - 0 as libc::c_ulong, - 0 as libc::c_ulong, - ); - // We have no good way of propagating errors here, but in debug-builds let's check that this actually worked. - debug_assert_eq!(res, 0); - } - } - - #[cfg(any( - target_os = "linux", - target_os = "freebsd", - target_os = "dragonfly", - target_os = "nuttx", - target_os = "cygwin" - ))] - pub fn set_name(name: &CStr) { - unsafe { - cfg_select! { - any(target_os = "linux", target_os = "cygwin") => { - // Linux and Cygwin limits the allowed length of the name. - const TASK_COMM_LEN: usize = 16; - let name = truncate_cstr::<{ TASK_COMM_LEN }>(name); - } - _ => { - // FreeBSD, DragonFly BSD and NuttX do not enforce length limits. - } - }; - // Available since glibc 2.12, musl 1.1.16, and uClibc 1.0.20 for Linux, - // FreeBSD 12.2 and 13.0, and DragonFly BSD 6.0. - let res = libc::pthread_setname_np(libc::pthread_self(), name.as_ptr()); - // We have no good way of propagating errors here, but in debug-builds let's check that this actually worked. - debug_assert_eq!(res, 0); - } - } - - #[cfg(target_os = "openbsd")] - pub fn set_name(name: &CStr) { - unsafe { - libc::pthread_set_name_np(libc::pthread_self(), name.as_ptr()); - } - } - - #[cfg(target_vendor = "apple")] - pub fn set_name(name: &CStr) { - unsafe { - let name = truncate_cstr::<{ libc::MAXTHREADNAMESIZE }>(name); - let res = libc::pthread_setname_np(name.as_ptr()); - // We have no good way of propagating errors here, but in debug-builds let's check that this actually worked. - debug_assert_eq!(res, 0); - } - } - - #[cfg(target_os = "netbsd")] - pub fn set_name(name: &CStr) { - unsafe { - let res = libc::pthread_setname_np( - libc::pthread_self(), - c"%s".as_ptr(), - name.as_ptr() as *mut libc::c_void, - ); - debug_assert_eq!(res, 0); - } - } - - #[cfg(any(target_os = "solaris", target_os = "illumos", target_os = "nto"))] - pub fn set_name(name: &CStr) { - weak!( - fn pthread_setname_np( - thread: libc::pthread_t, - name: *const libc::c_char, - ) -> libc::c_int; - ); - - if let Some(f) = pthread_setname_np.get() { - #[cfg(target_os = "nto")] - const THREAD_NAME_MAX: usize = libc::_NTO_THREAD_NAME_MAX as usize; - #[cfg(any(target_os = "solaris", target_os = "illumos"))] - const THREAD_NAME_MAX: usize = 32; - - let name = truncate_cstr::<{ THREAD_NAME_MAX }>(name); - let res = unsafe { f(libc::pthread_self(), name.as_ptr()) }; - debug_assert_eq!(res, 0); - } - } - - #[cfg(target_os = "fuchsia")] - pub fn set_name(name: &CStr) { - use super::fuchsia::*; - unsafe { - zx_object_set_property( - zx_thread_self(), - ZX_PROP_NAME, - name.as_ptr() as *const libc::c_void, - name.to_bytes().len(), - ); - } - } - - #[cfg(target_os = "haiku")] - pub fn set_name(name: &CStr) { - unsafe { - let thread_self = libc::find_thread(ptr::null_mut()); - let res = libc::rename_thread(thread_self, name.as_ptr()); - // We have no good way of propagating errors here, but in debug-builds let's check that this actually worked. - debug_assert_eq!(res, libc::B_OK); - } - } - - #[cfg(target_os = "vxworks")] - pub fn set_name(name: &CStr) { - let mut name = truncate_cstr::<{ (libc::VX_TASK_RENAME_LENGTH - 1) as usize }>(name); - let res = unsafe { libc::taskNameSet(libc::taskIdSelf(), name.as_mut_ptr()) }; - debug_assert_eq!(res, libc::OK); - } - - #[cfg(any( - target_env = "newlib", - target_os = "l4re", - target_os = "emscripten", - target_os = "redox", - target_os = "hurd", - target_os = "aix", - ))] - pub fn set_name(_name: &CStr) { - // Newlib and Emscripten have no way to set a thread name. - } - - #[cfg(not(target_os = "espidf"))] - pub fn sleep(dur: Duration) { - let mut secs = dur.as_secs(); - let mut nsecs = dur.subsec_nanos() as _; - - // If we're awoken with a signal then the return value will be -1 and - // nanosleep will fill in `ts` with the remaining time. - unsafe { - while secs > 0 || nsecs > 0 { - let mut ts = libc::timespec { - tv_sec: cmp::min(libc::time_t::MAX as u64, secs) as libc::time_t, - tv_nsec: nsecs, - }; - secs -= ts.tv_sec as u64; - let ts_ptr = &raw mut ts; - if libc::nanosleep(ts_ptr, ts_ptr) == -1 { - assert_eq!(os::errno(), libc::EINTR); - secs += ts.tv_sec as u64; - nsecs = ts.tv_nsec; - } else { - nsecs = 0; - } - } - } - } - - #[cfg(target_os = "espidf")] - pub fn sleep(dur: Duration) { - // ESP-IDF does not have `nanosleep`, so we use `usleep` instead. - // As per the documentation of `usleep`, it is expected to support - // sleep times as big as at least up to 1 second. - // - // ESP-IDF does support almost up to `u32::MAX`, but due to a potential integer overflow in its - // `usleep` implementation - // (https://github.com/espressif/esp-idf/blob/d7ca8b94c852052e3bc33292287ef4dd62c9eeb1/components/newlib/time.c#L210), - // we limit the sleep time to the maximum one that would not cause the underlying `usleep` implementation to overflow - // (`portTICK_PERIOD_MS` can be anything between 1 to 1000, and is 10 by default). - const MAX_MICROS: u32 = u32::MAX - 1_000_000 - 1; - - // Add any nanoseconds smaller than a microsecond as an extra microsecond - // so as to comply with the `std::thread::sleep` contract which mandates - // implementations to sleep for _at least_ the provided `dur`. - // We can't overflow `micros` as it is a `u128`, while `Duration` is a pair of - // (`u64` secs, `u32` nanos), where the nanos are strictly smaller than 1 second - // (i.e. < 1_000_000_000) - let mut micros = dur.as_micros() + if dur.subsec_nanos() % 1_000 > 0 { 1 } else { 0 }; - - while micros > 0 { - let st = if micros > MAX_MICROS as u128 { MAX_MICROS } else { micros as u32 }; - unsafe { - libc::usleep(st); - } - - micros -= st as u128; - } - } - - // Any unix that has clock_nanosleep - // If this list changes update the MIRI chock_nanosleep shim - #[cfg(any( - target_os = "freebsd", - target_os = "netbsd", - target_os = "linux", - target_os = "android", - target_os = "solaris", - target_os = "illumos", - target_os = "dragonfly", - target_os = "hurd", - target_os = "fuchsia", - target_os = "vxworks", - ))] - pub fn sleep_until(deadline: Instant) { - let Some(ts) = deadline.into_inner().into_timespec().to_timespec() else { - // The deadline is further in the future then can be passed to - // clock_nanosleep. We have to use Self::sleep instead. This might - // happen on 32 bit platforms, especially closer to 2038. - let now = Instant::now(); - if let Some(delay) = deadline.checked_duration_since(now) { - Self::sleep(delay); - } - return; - }; - - unsafe { - // When we get interrupted (res = EINTR) call clock_nanosleep again - loop { - let res = libc::clock_nanosleep( - super::time::Instant::CLOCK_ID, - libc::TIMER_ABSTIME, - &ts, - core::ptr::null_mut(), // not required with TIMER_ABSTIME - ); - - if res == 0 { - break; - } else { - assert_eq!( - res, - libc::EINTR, - "timespec is in range, - clockid is valid and kernel should support it" - ); - } - } - } - } - - // Any unix that does not have clock_nanosleep - #[cfg(not(any( - target_os = "freebsd", - target_os = "netbsd", - target_os = "linux", - target_os = "android", - target_os = "solaris", - target_os = "illumos", - target_os = "dragonfly", - target_os = "hurd", - target_os = "fuchsia", - target_os = "vxworks", - )))] - pub fn sleep_until(deadline: Instant) { - let now = Instant::now(); - if let Some(delay) = deadline.checked_duration_since(now) { - Self::sleep(delay); - } - } - pub fn join(self) { let id = self.into_id(); let ret = unsafe { libc::pthread_join(id, ptr::null_mut()) }; @@ -410,84 +151,6 @@ impl Drop for Thread { } } -pub(crate) fn current_os_id() -> Option<u64> { - // Most Unix platforms have a way to query an integer ID of the current thread, all with - // slightly different spellings. - // - // The OS thread ID is used rather than `pthread_self` so as to match what will be displayed - // for process inspection (debuggers, trace, `top`, etc.). - cfg_select! { - // Most platforms have a function returning a `pid_t` or int, which is an `i32`. - any(target_os = "android", target_os = "linux") => { - use crate::sys::weak::syscall; - - // `libc::gettid` is only available on glibc 2.30+, but the syscall is available - // since Linux 2.4.11. - syscall!(fn gettid() -> libc::pid_t;); - - // SAFETY: FFI call with no preconditions. - let id: libc::pid_t = unsafe { gettid() }; - Some(id as u64) - } - target_os = "nto" => { - // SAFETY: FFI call with no preconditions. - let id: libc::pid_t = unsafe { libc::gettid() }; - Some(id as u64) - } - target_os = "openbsd" => { - // SAFETY: FFI call with no preconditions. - let id: libc::pid_t = unsafe { libc::getthrid() }; - Some(id as u64) - } - target_os = "freebsd" => { - // SAFETY: FFI call with no preconditions. - let id: libc::c_int = unsafe { libc::pthread_getthreadid_np() }; - Some(id as u64) - } - target_os = "netbsd" => { - // SAFETY: FFI call with no preconditions. - let id: libc::lwpid_t = unsafe { libc::_lwp_self() }; - Some(id as u64) - } - any(target_os = "illumos", target_os = "solaris") => { - // On Illumos and Solaris, the `pthread_t` is the same as the OS thread ID. - // SAFETY: FFI call with no preconditions. - let id: libc::pthread_t = unsafe { libc::pthread_self() }; - Some(id as u64) - } - target_vendor = "apple" => { - // Apple allows querying arbitrary thread IDs, `thread=NULL` queries the current thread. - let mut id = 0u64; - // SAFETY: `thread_id` is a valid pointer, no other preconditions. - let status: libc::c_int = unsafe { libc::pthread_threadid_np(0, &mut id) }; - if status == 0 { - Some(id) - } else { - None - } - } - // Other platforms don't have an OS thread ID or don't have a way to access it. - _ => None, - } -} - -#[cfg(any( - target_os = "linux", - target_os = "nto", - target_os = "solaris", - target_os = "illumos", - target_os = "vxworks", - target_os = "cygwin", - target_vendor = "apple", -))] -fn truncate_cstr<const MAX_WITH_NUL: usize>(cstr: &CStr) -> [libc::c_char; MAX_WITH_NUL] { - let mut result = [0; MAX_WITH_NUL]; - for (src, dst) in cstr.to_bytes().iter().zip(&mut result[..MAX_WITH_NUL - 1]) { - *dst = *src as libc::c_char; - } - result -} - pub fn available_parallelism() -> io::Result<NonZero<usize>> { cfg_select! { any( @@ -668,6 +331,318 @@ pub fn available_parallelism() -> io::Result<NonZero<usize>> { } } +pub fn current_os_id() -> Option<u64> { + // Most Unix platforms have a way to query an integer ID of the current thread, all with + // slightly different spellings. + // + // The OS thread ID is used rather than `pthread_self` so as to match what will be displayed + // for process inspection (debuggers, trace, `top`, etc.). + cfg_select! { + // Most platforms have a function returning a `pid_t` or int, which is an `i32`. + any(target_os = "android", target_os = "linux") => { + use crate::sys::pal::weak::syscall; + + // `libc::gettid` is only available on glibc 2.30+, but the syscall is available + // since Linux 2.4.11. + syscall!(fn gettid() -> libc::pid_t;); + + // SAFETY: FFI call with no preconditions. + let id: libc::pid_t = unsafe { gettid() }; + Some(id as u64) + } + target_os = "nto" => { + // SAFETY: FFI call with no preconditions. + let id: libc::pid_t = unsafe { libc::gettid() }; + Some(id as u64) + } + target_os = "openbsd" => { + // SAFETY: FFI call with no preconditions. + let id: libc::pid_t = unsafe { libc::getthrid() }; + Some(id as u64) + } + target_os = "freebsd" => { + // SAFETY: FFI call with no preconditions. + let id: libc::c_int = unsafe { libc::pthread_getthreadid_np() }; + Some(id as u64) + } + target_os = "netbsd" => { + // SAFETY: FFI call with no preconditions. + let id: libc::lwpid_t = unsafe { libc::_lwp_self() }; + Some(id as u64) + } + any(target_os = "illumos", target_os = "solaris") => { + // On Illumos and Solaris, the `pthread_t` is the same as the OS thread ID. + // SAFETY: FFI call with no preconditions. + let id: libc::pthread_t = unsafe { libc::pthread_self() }; + Some(id as u64) + } + target_vendor = "apple" => { + // Apple allows querying arbitrary thread IDs, `thread=NULL` queries the current thread. + let mut id = 0u64; + // SAFETY: `thread_id` is a valid pointer, no other preconditions. + let status: libc::c_int = unsafe { libc::pthread_threadid_np(0, &mut id) }; + if status == 0 { + Some(id) + } else { + None + } + } + // Other platforms don't have an OS thread ID or don't have a way to access it. + _ => None, + } +} + +#[cfg(any( + target_os = "linux", + target_os = "nto", + target_os = "solaris", + target_os = "illumos", + target_os = "vxworks", + target_os = "cygwin", + target_vendor = "apple", +))] +fn truncate_cstr<const MAX_WITH_NUL: usize>(cstr: &CStr) -> [libc::c_char; MAX_WITH_NUL] { + let mut result = [0; MAX_WITH_NUL]; + for (src, dst) in cstr.to_bytes().iter().zip(&mut result[..MAX_WITH_NUL - 1]) { + *dst = *src as libc::c_char; + } + result +} + +#[cfg(target_os = "android")] +pub fn set_name(name: &CStr) { + const PR_SET_NAME: libc::c_int = 15; + unsafe { + let res = libc::prctl( + PR_SET_NAME, + name.as_ptr(), + 0 as libc::c_ulong, + 0 as libc::c_ulong, + 0 as libc::c_ulong, + ); + // We have no good way of propagating errors here, but in debug-builds let's check that this actually worked. + debug_assert_eq!(res, 0); + } +} + +#[cfg(any( + target_os = "linux", + target_os = "freebsd", + target_os = "dragonfly", + target_os = "nuttx", + target_os = "cygwin" +))] +pub fn set_name(name: &CStr) { + unsafe { + cfg_select! { + any(target_os = "linux", target_os = "cygwin") => { + // Linux and Cygwin limits the allowed length of the name. + const TASK_COMM_LEN: usize = 16; + let name = truncate_cstr::<{ TASK_COMM_LEN }>(name); + } + _ => { + // FreeBSD, DragonFly BSD and NuttX do not enforce length limits. + } + }; + // Available since glibc 2.12, musl 1.1.16, and uClibc 1.0.20 for Linux, + // FreeBSD 12.2 and 13.0, and DragonFly BSD 6.0. + let res = libc::pthread_setname_np(libc::pthread_self(), name.as_ptr()); + // We have no good way of propagating errors here, but in debug-builds let's check that this actually worked. + debug_assert_eq!(res, 0); + } +} + +#[cfg(target_os = "openbsd")] +pub fn set_name(name: &CStr) { + unsafe { + libc::pthread_set_name_np(libc::pthread_self(), name.as_ptr()); + } +} + +#[cfg(target_vendor = "apple")] +pub fn set_name(name: &CStr) { + unsafe { + let name = truncate_cstr::<{ libc::MAXTHREADNAMESIZE }>(name); + let res = libc::pthread_setname_np(name.as_ptr()); + // We have no good way of propagating errors here, but in debug-builds let's check that this actually worked. + debug_assert_eq!(res, 0); + } +} + +#[cfg(target_os = "netbsd")] +pub fn set_name(name: &CStr) { + unsafe { + let res = libc::pthread_setname_np( + libc::pthread_self(), + c"%s".as_ptr(), + name.as_ptr() as *mut libc::c_void, + ); + debug_assert_eq!(res, 0); + } +} + +#[cfg(any(target_os = "solaris", target_os = "illumos", target_os = "nto"))] +pub fn set_name(name: &CStr) { + weak!( + fn pthread_setname_np(thread: libc::pthread_t, name: *const libc::c_char) -> libc::c_int; + ); + + if let Some(f) = pthread_setname_np.get() { + #[cfg(target_os = "nto")] + const THREAD_NAME_MAX: usize = libc::_NTO_THREAD_NAME_MAX as usize; + #[cfg(any(target_os = "solaris", target_os = "illumos"))] + const THREAD_NAME_MAX: usize = 32; + + let name = truncate_cstr::<{ THREAD_NAME_MAX }>(name); + let res = unsafe { f(libc::pthread_self(), name.as_ptr()) }; + debug_assert_eq!(res, 0); + } +} + +#[cfg(target_os = "fuchsia")] +pub fn set_name(name: &CStr) { + use crate::sys::pal::fuchsia::*; + unsafe { + zx_object_set_property( + zx_thread_self(), + ZX_PROP_NAME, + name.as_ptr() as *const libc::c_void, + name.to_bytes().len(), + ); + } +} + +#[cfg(target_os = "haiku")] +pub fn set_name(name: &CStr) { + unsafe { + let thread_self = libc::find_thread(ptr::null_mut()); + let res = libc::rename_thread(thread_self, name.as_ptr()); + // We have no good way of propagating errors here, but in debug-builds let's check that this actually worked. + debug_assert_eq!(res, libc::B_OK); + } +} + +#[cfg(target_os = "vxworks")] +pub fn set_name(name: &CStr) { + let mut name = truncate_cstr::<{ (libc::VX_TASK_RENAME_LENGTH - 1) as usize }>(name); + let res = unsafe { libc::taskNameSet(libc::taskIdSelf(), name.as_mut_ptr()) }; + debug_assert_eq!(res, libc::OK); +} + +#[cfg(not(target_os = "espidf"))] +pub fn sleep(dur: Duration) { + let mut secs = dur.as_secs(); + let mut nsecs = dur.subsec_nanos() as _; + + // If we're awoken with a signal then the return value will be -1 and + // nanosleep will fill in `ts` with the remaining time. + unsafe { + while secs > 0 || nsecs > 0 { + let mut ts = libc::timespec { + tv_sec: cmp::min(libc::time_t::MAX as u64, secs) as libc::time_t, + tv_nsec: nsecs, + }; + secs -= ts.tv_sec as u64; + let ts_ptr = &raw mut ts; + if libc::nanosleep(ts_ptr, ts_ptr) == -1 { + assert_eq!(os::errno(), libc::EINTR); + secs += ts.tv_sec as u64; + nsecs = ts.tv_nsec; + } else { + nsecs = 0; + } + } + } +} + +#[cfg(target_os = "espidf")] +pub fn sleep(dur: Duration) { + // ESP-IDF does not have `nanosleep`, so we use `usleep` instead. + // As per the documentation of `usleep`, it is expected to support + // sleep times as big as at least up to 1 second. + // + // ESP-IDF does support almost up to `u32::MAX`, but due to a potential integer overflow in its + // `usleep` implementation + // (https://github.com/espressif/esp-idf/blob/d7ca8b94c852052e3bc33292287ef4dd62c9eeb1/components/newlib/time.c#L210), + // we limit the sleep time to the maximum one that would not cause the underlying `usleep` implementation to overflow + // (`portTICK_PERIOD_MS` can be anything between 1 to 1000, and is 10 by default). + const MAX_MICROS: u32 = u32::MAX - 1_000_000 - 1; + + // Add any nanoseconds smaller than a microsecond as an extra microsecond + // so as to comply with the `std::thread::sleep` contract which mandates + // implementations to sleep for _at least_ the provided `dur`. + // We can't overflow `micros` as it is a `u128`, while `Duration` is a pair of + // (`u64` secs, `u32` nanos), where the nanos are strictly smaller than 1 second + // (i.e. < 1_000_000_000) + let mut micros = dur.as_micros() + if dur.subsec_nanos() % 1_000 > 0 { 1 } else { 0 }; + + while micros > 0 { + let st = if micros > MAX_MICROS as u128 { MAX_MICROS } else { micros as u32 }; + unsafe { + libc::usleep(st); + } + + micros -= st as u128; + } +} + +// Any unix that has clock_nanosleep +// If this list changes update the MIRI chock_nanosleep shim +#[cfg(any( + target_os = "freebsd", + target_os = "netbsd", + target_os = "linux", + target_os = "android", + target_os = "solaris", + target_os = "illumos", + target_os = "dragonfly", + target_os = "hurd", + target_os = "fuchsia", + target_os = "vxworks", +))] +pub fn sleep_until(deadline: crate::time::Instant) { + use crate::time::Instant; + + let Some(ts) = deadline.into_inner().into_timespec().to_timespec() else { + // The deadline is further in the future then can be passed to + // clock_nanosleep. We have to use Self::sleep instead. This might + // happen on 32 bit platforms, especially closer to 2038. + let now = Instant::now(); + if let Some(delay) = deadline.checked_duration_since(now) { + sleep(delay); + } + return; + }; + + unsafe { + // When we get interrupted (res = EINTR) call clock_nanosleep again + loop { + let res = libc::clock_nanosleep( + crate::sys::time::Instant::CLOCK_ID, + libc::TIMER_ABSTIME, + &ts, + core::ptr::null_mut(), // not required with TIMER_ABSTIME + ); + + if res == 0 { + break; + } else { + assert_eq!( + res, + libc::EINTR, + "timespec is in range, + clockid is valid and kernel should support it" + ); + } + } + } +} + +pub fn yield_now() { + let ret = unsafe { libc::sched_yield() }; + debug_assert_eq!(ret, 0); +} + #[cfg(any(target_os = "android", target_os = "linux"))] mod cgroups { //! Currently not covered diff --git a/library/std/src/sys/pal/unsupported/thread.rs b/library/std/src/sys/thread/unsupported.rs index 34d9b5ec70c..a5001efa3b4 100644 --- a/library/std/src/sys/pal/unsupported/thread.rs +++ b/library/std/src/sys/thread/unsupported.rs @@ -1,8 +1,7 @@ -use super::unsupported; use crate::ffi::CStr; use crate::io; use crate::num::NonZero; -use crate::time::{Duration, Instant}; +use crate::time::Duration; pub struct Thread(!); @@ -15,23 +14,7 @@ impl Thread { _name: Option<&str>, _p: Box<dyn FnOnce()>, ) -> io::Result<Thread> { - unsupported() - } - - pub fn yield_now() { - // do nothing - } - - pub fn set_name(_name: &CStr) { - // nope - } - - pub fn sleep(_dur: Duration) { - panic!("can't sleep"); - } - - pub fn sleep_until(_deadline: Instant) { - panic!("can't sleep"); + Err(io::Error::UNSUPPORTED_PLATFORM) } pub fn join(self) { @@ -39,10 +22,22 @@ impl Thread { } } -pub(crate) fn current_os_id() -> Option<u64> { +pub fn available_parallelism() -> io::Result<NonZero<usize>> { + Err(io::Error::UNKNOWN_THREAD_COUNT) +} + +pub fn current_os_id() -> Option<u64> { None } -pub fn available_parallelism() -> io::Result<NonZero<usize>> { - unsupported() +pub fn yield_now() { + // do nothing +} + +pub fn set_name(_name: &CStr) { + // nope +} + +pub fn sleep(_dur: Duration) { + panic!("can't sleep"); } diff --git a/library/std/src/sys/thread/wasip1.rs b/library/std/src/sys/thread/wasip1.rs new file mode 100644 index 00000000000..83001fad49c --- /dev/null +++ b/library/std/src/sys/thread/wasip1.rs @@ -0,0 +1,185 @@ +#![forbid(unsafe_op_in_unsafe_fn)] + +#[cfg(target_feature = "atomics")] +use crate::io; +use crate::mem; +#[cfg(target_feature = "atomics")] +use crate::num::NonZero; +#[cfg(target_feature = "atomics")] +use crate::sys::os; +use crate::time::Duration; +#[cfg(target_feature = "atomics")] +use crate::{cmp, ptr}; + +// Add a few symbols not in upstream `libc` just yet. +#[cfg(target_feature = "atomics")] +mod libc { + pub use libc::*; + + pub use crate::ffi; + + // defined in wasi-libc + // https://github.com/WebAssembly/wasi-libc/blob/a6f871343313220b76009827ed0153586361c0d5/libc-top-half/musl/include/alltypes.h.in#L108 + #[repr(C)] + union pthread_attr_union { + __i: [ffi::c_int; if size_of::<ffi::c_long>() == 8 { 14 } else { 9 }], + __vi: [ffi::c_int; if size_of::<ffi::c_long>() == 8 { 14 } else { 9 }], + __s: [ffi::c_ulong; if size_of::<ffi::c_long>() == 8 { 7 } else { 9 }], + } + + #[repr(C)] + pub struct pthread_attr_t { + __u: pthread_attr_union, + } + + #[allow(non_camel_case_types)] + pub type pthread_t = *mut ffi::c_void; + + pub const _SC_NPROCESSORS_ONLN: ffi::c_int = 84; + + unsafe extern "C" { + pub fn pthread_create( + native: *mut pthread_t, + attr: *const pthread_attr_t, + f: extern "C" fn(*mut ffi::c_void) -> *mut ffi::c_void, + value: *mut ffi::c_void, + ) -> ffi::c_int; + pub fn pthread_join(native: pthread_t, value: *mut *mut ffi::c_void) -> ffi::c_int; + pub fn pthread_attr_init(attrp: *mut pthread_attr_t) -> ffi::c_int; + pub fn pthread_attr_setstacksize( + attr: *mut pthread_attr_t, + stack_size: libc::size_t, + ) -> ffi::c_int; + pub fn pthread_attr_destroy(attr: *mut pthread_attr_t) -> ffi::c_int; + pub fn pthread_detach(thread: pthread_t) -> ffi::c_int; + } +} + +#[cfg(target_feature = "atomics")] +pub struct Thread { + id: libc::pthread_t, +} + +#[cfg(target_feature = "atomics")] +impl Drop for Thread { + fn drop(&mut self) { + let ret = unsafe { libc::pthread_detach(self.id) }; + debug_assert_eq!(ret, 0); + } +} + +pub const DEFAULT_MIN_STACK_SIZE: usize = 1024 * 1024; + +#[cfg(target_feature = "atomics")] +impl Thread { + // unsafe: see thread::Builder::spawn_unchecked for safety requirements + pub unsafe fn new( + stack: usize, + _name: Option<&str>, + p: Box<dyn FnOnce()>, + ) -> io::Result<Thread> { + let p = Box::into_raw(Box::new(p)); + let mut native: libc::pthread_t = unsafe { mem::zeroed() }; + let mut attr: libc::pthread_attr_t = unsafe { mem::zeroed() }; + assert_eq!(unsafe { libc::pthread_attr_init(&mut attr) }, 0); + + let stack_size = cmp::max(stack, DEFAULT_MIN_STACK_SIZE); + + match unsafe { libc::pthread_attr_setstacksize(&mut attr, stack_size) } { + 0 => {} + n => { + assert_eq!(n, libc::EINVAL); + // EINVAL means |stack_size| is either too small or not a + // multiple of the system page size. Because it's definitely + // >= PTHREAD_STACK_MIN, it must be an alignment issue. + // Round up to the nearest page and try again. + let page_size = os::page_size(); + let stack_size = + (stack_size + page_size - 1) & (-(page_size as isize - 1) as usize - 1); + assert_eq!(unsafe { libc::pthread_attr_setstacksize(&mut attr, stack_size) }, 0); + } + }; + + let ret = unsafe { libc::pthread_create(&mut native, &attr, thread_start, p as *mut _) }; + // Note: if the thread creation fails and this assert fails, then p will + // be leaked. However, an alternative design could cause double-free + // which is clearly worse. + assert_eq!(unsafe { libc::pthread_attr_destroy(&mut attr) }, 0); + + return if ret != 0 { + // The thread failed to start and as a result p was not consumed. Therefore, it is + // safe to reconstruct the box so that it gets deallocated. + unsafe { + drop(Box::from_raw(p)); + } + Err(io::Error::from_raw_os_error(ret)) + } else { + Ok(Thread { id: native }) + }; + + extern "C" fn thread_start(main: *mut libc::c_void) -> *mut libc::c_void { + unsafe { + // Finally, let's run some code. + Box::from_raw(main as *mut Box<dyn FnOnce()>)(); + } + ptr::null_mut() + } + } + + pub fn join(self) { + let id = mem::ManuallyDrop::new(self).id; + let ret = unsafe { libc::pthread_join(id, ptr::null_mut()) }; + if ret != 0 { + rtabort!("failed to join thread: {}", io::Error::from_raw_os_error(ret)); + } + } +} + +#[cfg(target_feature = "atomics")] +pub fn available_parallelism() -> io::Result<NonZero<usize>> { + match unsafe { libc::sysconf(libc::_SC_NPROCESSORS_ONLN) } { + -1 => Err(io::Error::last_os_error()), + cpus => NonZero::new(cpus as usize).ok_or(io::Error::UNKNOWN_THREAD_COUNT), + } +} + +pub fn yield_now() { + let ret = unsafe { wasi::sched_yield() }; + debug_assert_eq!(ret, Ok(())); +} + +pub fn sleep(dur: Duration) { + let mut nanos = dur.as_nanos(); + while nanos > 0 { + const USERDATA: wasi::Userdata = 0x0123_45678; + + let clock = wasi::SubscriptionClock { + id: wasi::CLOCKID_MONOTONIC, + timeout: u64::try_from(nanos).unwrap_or(u64::MAX), + precision: 0, + flags: 0, + }; + nanos -= u128::from(clock.timeout); + + let in_ = wasi::Subscription { + userdata: USERDATA, + u: wasi::SubscriptionU { tag: 0, u: wasi::SubscriptionUU { clock } }, + }; + unsafe { + let mut event: wasi::Event = mem::zeroed(); + let res = wasi::poll_oneoff(&in_, &mut event, 1); + match (res, event) { + ( + Ok(1), + wasi::Event { + userdata: USERDATA, + error: wasi::ERRNO_SUCCESS, + type_: wasi::EVENTTYPE_CLOCK, + .. + }, + ) => {} + _ => panic!("thread::sleep(): unexpected result of poll_oneoff"), + } + } + } +} diff --git a/library/std/src/sys/thread/wasip2.rs b/library/std/src/sys/thread/wasip2.rs new file mode 100644 index 00000000000..420cad2a5e4 --- /dev/null +++ b/library/std/src/sys/thread/wasip2.rs @@ -0,0 +1,32 @@ +use crate::time::{Duration, Instant}; + +pub fn sleep(dur: Duration) { + // Sleep in increments of `u64::MAX` nanoseconds until the `dur` is + // entirely drained. + let mut remaining = dur.as_nanos(); + while remaining > 0 { + let amt = u64::try_from(remaining).unwrap_or(u64::MAX); + wasip2::clocks::monotonic_clock::subscribe_duration(amt).block(); + remaining -= u128::from(amt); + } +} + +pub fn sleep_until(deadline: Instant) { + match u64::try_from(deadline.into_inner().as_duration().as_nanos()) { + // If the point in time we're sleeping to fits within a 64-bit + // number of nanoseconds then directly use `subscribe_instant`. + Ok(deadline) => { + wasip2::clocks::monotonic_clock::subscribe_instant(deadline).block(); + } + // ... otherwise we're sleeping for 500+ years relative to the + // "start" of what the system is using as a clock so speed/accuracy + // is not so much of a concern. Use `sleep` instead. + Err(_) => { + let now = Instant::now(); + + if let Some(delay) = deadline.checked_duration_since(now) { + sleep(delay); + } + } + } +} diff --git a/library/std/src/sys/thread/wasm.rs b/library/std/src/sys/thread/wasm.rs new file mode 100644 index 00000000000..e843bc992ba --- /dev/null +++ b/library/std/src/sys/thread/wasm.rs @@ -0,0 +1,23 @@ +use crate::cmp; +use crate::time::Duration; + +pub fn sleep(dur: Duration) { + #[cfg(target_arch = "wasm32")] + use core::arch::wasm32 as wasm; + #[cfg(target_arch = "wasm64")] + use core::arch::wasm64 as wasm; + + // Use an atomic wait to block the current thread artificially with a + // timeout listed. Note that we should never be notified (return value + // of 0) or our comparison should never fail (return value of 1) so we + // should always only resume execution through a timeout (return value + // 2). + let mut nanos = dur.as_nanos(); + while nanos > 0 { + let amt = cmp::min(i64::MAX as u128, nanos); + let mut x = 0; + let val = unsafe { wasm::memory_atomic_wait32(&mut x, 0, amt as i64) }; + debug_assert_eq!(val, 2); + nanos -= amt; + } +} diff --git a/library/std/src/sys/pal/windows/thread.rs b/library/std/src/sys/thread/windows.rs index b0e38220a2d..a5640c51c4a 100644 --- a/library/std/src/sys/pal/windows/thread.rs +++ b/library/std/src/sys/thread/windows.rs @@ -1,14 +1,14 @@ use core::ffi::c_void; -use super::time::WaitableTimer; -use super::to_u16s; use crate::ffi::CStr; use crate::num::NonZero; use crate::os::windows::io::{AsRawHandle, HandleOrNull}; use crate::sys::handle::Handle; +use crate::sys::pal::time::WaitableTimer; +use crate::sys::pal::{dur2timeout, to_u16s}; use crate::sys::{c, stack_overflow}; use crate::sys_common::FromInner; -use crate::time::{Duration, Instant}; +use crate::time::Duration; use crate::{io, ptr}; pub const DEFAULT_MIN_STACK_SIZE: usize = 2 * 1024 * 1024; @@ -62,24 +62,6 @@ impl Thread { } } - pub fn set_name(name: &CStr) { - if let Ok(utf8) = name.to_str() { - if let Ok(utf16) = to_u16s(utf8) { - unsafe { - // SAFETY: the vec returned by `to_u16s` ends with a zero value - Self::set_name_wide(&utf16) - } - }; - }; - } - - /// # Safety - /// - /// `name` must end with a zero value - pub unsafe fn set_name_wide(name: &[u16]) { - unsafe { c::SetThreadDescription(c::GetCurrentThread(), name.as_ptr()) }; - } - pub fn join(self) { let rc = unsafe { c::WaitForSingleObject(self.handle.as_raw_handle(), c::INFINITE) }; if rc == c::WAIT_FAILED { @@ -87,37 +69,6 @@ impl Thread { } } - pub fn yield_now() { - // This function will return 0 if there are no other threads to execute, - // but this also means that the yield was useless so this isn't really a - // case that needs to be worried about. - unsafe { - c::SwitchToThread(); - } - } - - pub fn sleep(dur: Duration) { - fn high_precision_sleep(dur: Duration) -> Result<(), ()> { - let timer = WaitableTimer::high_resolution()?; - timer.set(dur)?; - timer.wait() - } - // Attempt to use high-precision sleep (Windows 10, version 1803+). - // On error fallback to the standard `Sleep` function. - // Also preserves the zero duration behavior of `Sleep`. - if dur.is_zero() || high_precision_sleep(dur).is_err() { - unsafe { c::Sleep(super::dur2timeout(dur)) } - } - } - - pub fn sleep_until(deadline: Instant) { - let now = Instant::now(); - - if let Some(delay) = deadline.checked_duration_since(now) { - Self::sleep(delay); - } - } - pub fn handle(&self) -> &Handle { &self.handle } @@ -127,14 +78,6 @@ impl Thread { } } -pub(crate) fn current_os_id() -> Option<u64> { - // SAFETY: FFI call with no preconditions. - let id: u32 = unsafe { c::GetCurrentThreadId() }; - - // A return value of 0 indicates failed lookup. - if id == 0 { None } else { Some(id.into()) } -} - pub fn available_parallelism() -> io::Result<NonZero<usize>> { let res = unsafe { let mut sysinfo: c::SYSTEM_INFO = crate::mem::zeroed(); @@ -146,3 +89,52 @@ pub fn available_parallelism() -> io::Result<NonZero<usize>> { cpus => Ok(unsafe { NonZero::new_unchecked(cpus) }), } } + +pub fn current_os_id() -> Option<u64> { + // SAFETY: FFI call with no preconditions. + let id: u32 = unsafe { c::GetCurrentThreadId() }; + + // A return value of 0 indicates failed lookup. + if id == 0 { None } else { Some(id.into()) } +} + +pub fn set_name(name: &CStr) { + if let Ok(utf8) = name.to_str() { + if let Ok(utf16) = to_u16s(utf8) { + unsafe { + // SAFETY: the vec returned by `to_u16s` ends with a zero value + set_name_wide(&utf16) + } + }; + }; +} + +/// # Safety +/// +/// `name` must end with a zero value +pub unsafe fn set_name_wide(name: &[u16]) { + unsafe { c::SetThreadDescription(c::GetCurrentThread(), name.as_ptr()) }; +} + +pub fn sleep(dur: Duration) { + fn high_precision_sleep(dur: Duration) -> Result<(), ()> { + let timer = WaitableTimer::high_resolution()?; + timer.set(dur)?; + timer.wait() + } + // Attempt to use high-precision sleep (Windows 10, version 1803+). + // On error fallback to the standard `Sleep` function. + // Also preserves the zero duration behavior of `Sleep`. + if dur.is_zero() || high_precision_sleep(dur).is_err() { + unsafe { c::Sleep(dur2timeout(dur)) } + } +} + +pub fn yield_now() { + // This function will return 0 if there are no other threads to execute, + // but this also means that the yield was useless so this isn't really a + // case that needs to be worried about. + unsafe { + c::SwitchToThread(); + } +} diff --git a/library/std/src/sys/pal/xous/thread.rs b/library/std/src/sys/thread/xous.rs index 92803c94c6e..133e15a0928 100644 --- a/library/std/src/sys/pal/xous/thread.rs +++ b/library/std/src/sys/thread/xous.rs @@ -1,6 +1,5 @@ use core::arch::asm; -use crate::ffi::CStr; use crate::io; use crate::num::NonZero; use crate::os::xous::ffi::{ @@ -8,7 +7,7 @@ use crate::os::xous::ffi::{ map_memory, update_memory_flags, }; use crate::os::xous::services::{TicktimerScalar, ticktimer_server}; -use crate::time::{Duration, Instant}; +use crate::time::Duration; pub struct Thread { tid: ThreadId, @@ -110,46 +109,29 @@ impl Thread { Ok(Thread { tid }) } - pub fn yield_now() { - do_yield(); - } - - pub fn set_name(_name: &CStr) { - // nope - } - - pub fn sleep(dur: Duration) { - // Because the sleep server works on units of `usized milliseconds`, split - // the messages up into these chunks. This means we may run into issues - // if you try to sleep a thread for more than 49 days on a 32-bit system. - let mut millis = dur.as_millis(); - while millis > 0 { - let sleep_duration = - if millis > (usize::MAX as _) { usize::MAX } else { millis as usize }; - blocking_scalar(ticktimer_server(), TicktimerScalar::SleepMs(sleep_duration).into()) - .expect("failed to send message to ticktimer server"); - millis -= sleep_duration as u128; - } - } - - pub fn sleep_until(deadline: Instant) { - let now = Instant::now(); - - if let Some(delay) = deadline.checked_duration_since(now) { - Self::sleep(delay); - } - } - pub fn join(self) { join_thread(self.tid).unwrap(); } } -pub(crate) fn current_os_id() -> Option<u64> { - None -} - pub fn available_parallelism() -> io::Result<NonZero<usize>> { // We're unicore right now. Ok(unsafe { NonZero::new_unchecked(1) }) } + +pub fn yield_now() { + do_yield(); +} + +pub fn sleep(dur: Duration) { + // Because the sleep server works on units of `usized milliseconds`, split + // the messages up into these chunks. This means we may run into issues + // if you try to sleep a thread for more than 49 days on a 32-bit system. + let mut millis = dur.as_millis(); + while millis > 0 { + let sleep_duration = if millis > (usize::MAX as _) { usize::MAX } else { millis as usize }; + blocking_scalar(ticktimer_server(), TicktimerScalar::SleepMs(sleep_duration).into()) + .expect("failed to send message to ticktimer server"); + millis -= sleep_duration as u128; + } +} diff --git a/library/std/src/thread/mod.rs b/library/std/src/thread/mod.rs index b6059c28cec..4d09b2b4e9d 100644 --- a/library/std/src/thread/mod.rs +++ b/library/std/src/thread/mod.rs @@ -550,7 +550,7 @@ impl Builder { } if let Some(name) = their_thread.cname() { - imp::Thread::set_name(name); + imp::set_name(name); } let f = f.into_inner(); @@ -763,7 +763,7 @@ where /// [`Mutex`]: crate::sync::Mutex #[stable(feature = "rust1", since = "1.0.0")] pub fn yield_now() { - imp::Thread::yield_now() + imp::yield_now() } /// Determines whether the current thread is unwinding because of panic. @@ -884,7 +884,7 @@ pub fn sleep_ms(ms: u32) { /// ``` #[stable(feature = "thread_sleep", since = "1.4.0")] pub fn sleep(dur: Duration) { - imp::Thread::sleep(dur) + imp::sleep(dur) } /// Puts the current thread to sleep until the specified deadline has passed. @@ -983,7 +983,7 @@ pub fn sleep(dur: Duration) { /// ``` #[unstable(feature = "thread_sleep_until", issue = "113752")] pub fn sleep_until(deadline: Instant) { - imp::Thread::sleep_until(deadline) + imp::sleep_until(deadline) } /// Used to ensure that `park` and `park_timeout` do not unwind, as that can @@ -1021,13 +1021,23 @@ impl Drop for PanicGuard { /// specifying a maximum time to block the thread for. /// /// * The [`unpark`] method on a [`Thread`] atomically makes the token available -/// if it wasn't already. Because the token is initially absent, [`unpark`] -/// followed by [`park`] will result in the second call returning immediately. -/// -/// The API is typically used by acquiring a handle to the current thread, -/// placing that handle in a shared data structure so that other threads can -/// find it, and then `park`ing in a loop. When some desired condition is met, another -/// thread calls [`unpark`] on the handle. +/// if it wasn't already. Because the token can be held by a thread even if it is currently not +/// parked, [`unpark`] followed by [`park`] will result in the second call returning immediately. +/// However, note that to rely on this guarantee, you need to make sure that your `unpark` happens +/// after all `park` that may be done by other data structures! +/// +/// The API is typically used by acquiring a handle to the current thread, placing that handle in a +/// shared data structure so that other threads can find it, and then `park`ing in a loop. When some +/// desired condition is met, another thread calls [`unpark`] on the handle. The last bullet point +/// above guarantees that even if the `unpark` occurs before the thread is finished `park`ing, it +/// will be woken up properly. +/// +/// Note that the coordination via the shared data structure is crucial: If you `unpark` a thread +/// without first establishing that it is about to be `park`ing within your code, that `unpark` may +/// get consumed by a *different* `park` in the same thread, leading to a deadlock. This also means +/// you must not call unknown code between setting up for parking and calling `park`; for instance, +/// if you invoke `println!`, that may itself call `park` and thus consume your `unpark` and cause a +/// deadlock. /// /// The motivation for this design is twofold: /// @@ -1058,21 +1068,24 @@ impl Drop for PanicGuard { /// /// ``` /// use std::thread; -/// use std::sync::{Arc, atomic::{Ordering, AtomicBool}}; +/// use std::sync::atomic::{Ordering, AtomicBool}; /// use std::time::Duration; /// -/// let flag = Arc::new(AtomicBool::new(false)); -/// let flag2 = Arc::clone(&flag); +/// static QUEUED: AtomicBool = AtomicBool::new(false); +/// static FLAG: AtomicBool = AtomicBool::new(false); /// /// let parked_thread = thread::spawn(move || { +/// println!("Thread spawned"); +/// // Signal that we are going to `park`. Between this store and our `park`, there may +/// // be no other `park`, or else that `park` could consume our `unpark` token! +/// QUEUED.store(true, Ordering::Release); /// // We want to wait until the flag is set. We *could* just spin, but using /// // park/unpark is more efficient. -/// while !flag2.load(Ordering::Relaxed) { -/// println!("Parking thread"); +/// while !FLAG.load(Ordering::Acquire) { +/// // We can *not* use `println!` here since that could use thread parking internally. /// thread::park(); /// // We *could* get here spuriously, i.e., way before the 10ms below are over! /// // But that is no problem, we are in a loop until the flag is set anyway. -/// println!("Thread unparked"); /// } /// println!("Flag received"); /// }); @@ -1080,11 +1093,22 @@ impl Drop for PanicGuard { /// // Let some time pass for the thread to be spawned. /// thread::sleep(Duration::from_millis(10)); /// +/// // Ensure the thread is about to park. +/// // This is crucial! It guarantees that the `unpark` below is not consumed +/// // by some other code in the parked thread (e.g. inside `println!`). +/// while !QUEUED.load(Ordering::Acquire) { +/// // Spinning is of course inefficient; in practice, this would more likely be +/// // a dequeue where we have no work to do if there's nobody queued. +/// std::hint::spin_loop(); +/// } +/// /// // Set the flag, and let the thread wake up. -/// // There is no race condition here, if `unpark` +/// // There is no race condition here: if `unpark` /// // happens first, `park` will return immediately. +/// // There is also no other `park` that could consume this token, +/// // since we waited until the other thread got queued. /// // Hence there is no risk of a deadlock. -/// flag.store(true, Ordering::Relaxed); +/// FLAG.store(true, Ordering::Release); /// println!("Unpark the thread"); /// parked_thread.thread().unpark(); /// @@ -1494,10 +1518,14 @@ impl Thread { /// ``` /// use std::thread; /// use std::time::Duration; + /// use std::sync::atomic::{AtomicBool, Ordering}; + /// + /// static QUEUED: AtomicBool = AtomicBool::new(false); /// /// let parked_thread = thread::Builder::new() /// .spawn(|| { /// println!("Parking thread"); + /// QUEUED.store(true, Ordering::Release); /// thread::park(); /// println!("Thread unparked"); /// }) @@ -1506,6 +1534,15 @@ impl Thread { /// // Let some time pass for the thread to be spawned. /// thread::sleep(Duration::from_millis(10)); /// + /// // Wait until the other thread is queued. + /// // This is crucial! It guarantees that the `unpark` below is not consumed + /// // by some other code in the parked thread (e.g. inside `println!`). + /// while !QUEUED.load(Ordering::Acquire) { + /// // Spinning is of course inefficient; in practice, this would more likely be + /// // a dequeue where we have no work to do if there's nobody queued. + /// std::hint::spin_loop(); + /// } + /// /// println!("Unpark the thread"); /// parked_thread.thread().unpark(); /// diff --git a/library/std/src/thread/tests.rs b/library/std/src/thread/tests.rs index ae889f1e778..2117f5f93ce 100644 --- a/library/std/src/thread/tests.rs +++ b/library/std/src/thread/tests.rs @@ -287,6 +287,8 @@ fn test_park_unpark_called_other_thread() { for _ in 0..10 { let th = thread::current(); + // Here we rely on `thread::spawn` (specifically the part that runs after spawning + // the thread) to not consume the parking token. let _guard = thread::spawn(move || { super::sleep(Duration::from_millis(50)); th.unpark(); @@ -316,6 +318,8 @@ fn test_park_timeout_unpark_called_other_thread() { for _ in 0..10 { let th = thread::current(); + // Here we rely on `thread::spawn` (specifically the part that runs after spawning + // the thread) to not consume the parking token. let _guard = thread::spawn(move || { super::sleep(Duration::from_millis(50)); th.unpark(); diff --git a/library/std/src/time.rs b/library/std/src/time.rs index 84fbb4c2fe4..31187adb6fe 100644 --- a/library/std/src/time.rs +++ b/library/std/src/time.rs @@ -551,13 +551,8 @@ impl SystemTime { /// println!("{difference:?}"); /// ``` #[stable(feature = "time2", since = "1.8.0")] - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn duration_since(&self, earlier: SystemTime) -> Result<Duration, SystemTimeError> { - // FIXME: map_err in const - match self.0.sub_time(&earlier.0) { - Ok(time) => Ok(time), - Err(err) => Err(SystemTimeError(err)), - } + pub fn duration_since(&self, earlier: SystemTime) -> Result<Duration, SystemTimeError> { + self.0.sub_time(&earlier.0).map_err(SystemTimeError) } /// Returns the difference from this system time to the @@ -594,8 +589,7 @@ impl SystemTime { /// `SystemTime` (which means it's inside the bounds of the underlying data structure), `None` /// otherwise. #[stable(feature = "time_checked_add", since = "1.34.0")] - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_add(&self, duration: Duration) -> Option<SystemTime> { + pub fn checked_add(&self, duration: Duration) -> Option<SystemTime> { self.0.checked_add_duration(&duration).map(SystemTime) } @@ -603,15 +597,13 @@ impl SystemTime { /// `SystemTime` (which means it's inside the bounds of the underlying data structure), `None` /// otherwise. #[stable(feature = "time_checked_add", since = "1.34.0")] - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn checked_sub(&self, duration: Duration) -> Option<SystemTime> { + pub fn checked_sub(&self, duration: Duration) -> Option<SystemTime> { self.0.checked_sub_duration(&duration).map(SystemTime) } } #[stable(feature = "time2", since = "1.8.0")] -#[rustc_const_unstable(feature = "const_ops", issue = "143802")] -impl const Add<Duration> for SystemTime { +impl Add<Duration> for SystemTime { type Output = SystemTime; /// # Panics @@ -624,16 +616,14 @@ impl const Add<Duration> for SystemTime { } #[stable(feature = "time_augmented_assignment", since = "1.9.0")] -#[rustc_const_unstable(feature = "const_ops", issue = "143802")] -impl const AddAssign<Duration> for SystemTime { +impl AddAssign<Duration> for SystemTime { fn add_assign(&mut self, other: Duration) { *self = *self + other; } } #[stable(feature = "time2", since = "1.8.0")] -#[rustc_const_unstable(feature = "const_ops", issue = "143802")] -impl const Sub<Duration> for SystemTime { +impl Sub<Duration> for SystemTime { type Output = SystemTime; fn sub(self, dur: Duration) -> SystemTime { @@ -642,8 +632,7 @@ impl const Sub<Duration> for SystemTime { } #[stable(feature = "time_augmented_assignment", since = "1.9.0")] -#[rustc_const_unstable(feature = "const_ops", issue = "143802")] -impl const SubAssign<Duration> for SystemTime { +impl SubAssign<Duration> for SystemTime { fn sub_assign(&mut self, other: Duration) { *self = *self - other; } @@ -710,8 +699,7 @@ impl SystemTimeError { /// ``` #[must_use] #[stable(feature = "time2", since = "1.8.0")] - #[rustc_const_unstable(feature = "const_system_time", issue = "144517")] - pub const fn duration(&self) -> Duration { + pub fn duration(&self) -> Duration { self.0 } } diff --git a/library/std/tests/sync/condvar.rs b/library/std/tests/sync/condvar.rs index 1d712a64300..1b1c33efad5 100644 --- a/library/std/tests/sync/condvar.rs +++ b/library/std/tests/sync/condvar.rs @@ -17,7 +17,7 @@ nonpoison_and_poison_unwrap_test!( } ); -#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads +#[cfg(not(any(target_os = "emscripten", target_os = "wasi")))] // No threads. nonpoison_and_poison_unwrap_test!( name: notify_one, test_body: { @@ -38,7 +38,7 @@ nonpoison_and_poison_unwrap_test!( } ); -#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads +#[cfg(not(any(target_os = "emscripten", target_os = "wasi")))] // No threads. nonpoison_and_poison_unwrap_test!( name: notify_all, test_body: { @@ -79,7 +79,7 @@ nonpoison_and_poison_unwrap_test!( } ); -#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads +#[cfg(not(any(target_os = "emscripten", target_os = "wasi")))] // No threads. nonpoison_and_poison_unwrap_test!( name: test_mutex_arc_condvar, test_body: { @@ -116,7 +116,7 @@ nonpoison_and_poison_unwrap_test!( } ); -#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads +#[cfg(not(any(target_os = "emscripten", target_os = "wasi")))] // No threads. nonpoison_and_poison_unwrap_test!( name: wait_while, test_body: { @@ -141,7 +141,7 @@ nonpoison_and_poison_unwrap_test!( } ); -#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads +#[cfg(not(any(target_os = "emscripten", target_os = "wasi")))] // No threads. nonpoison_and_poison_unwrap_test!( name: wait_timeout_wait, test_body: { @@ -164,7 +164,7 @@ nonpoison_and_poison_unwrap_test!( } ); -#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads +#[cfg(not(any(target_os = "emscripten", target_os = "wasi")))] // No threads. nonpoison_and_poison_unwrap_test!( name: wait_timeout_while_wait, test_body: { @@ -180,7 +180,7 @@ nonpoison_and_poison_unwrap_test!( } ); -#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads +#[cfg(not(any(target_os = "emscripten", target_os = "wasi")))] // No threads. nonpoison_and_poison_unwrap_test!( name: wait_timeout_while_instant_satisfy, test_body: { @@ -197,7 +197,7 @@ nonpoison_and_poison_unwrap_test!( } ); -#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads +#[cfg(not(any(target_os = "emscripten", target_os = "wasi")))] // No threads. nonpoison_and_poison_unwrap_test!( name: wait_timeout_while_wake, test_body: { @@ -226,7 +226,7 @@ nonpoison_and_poison_unwrap_test!( } ); -#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads +#[cfg(not(any(target_os = "emscripten", target_os = "wasi")))] // No threads. nonpoison_and_poison_unwrap_test!( name: wait_timeout_wake, test_body: { diff --git a/library/std/tests/sync/lib.rs b/library/std/tests/sync/lib.rs index ac1dbebcc5c..23112e10284 100644 --- a/library/std/tests/sync/lib.rs +++ b/library/std/tests/sync/lib.rs @@ -58,6 +58,9 @@ fn result_unwrap<T, E: std::fmt::Debug>(x: Result<T, E>) -> T { /// a no-op (the identity function). /// /// The test names will be prefiex with `poison_` or `nonpoison_`. +/// +/// Important: most attributes (except `cfg`) will not work properly! (They are only applied to the first test.) +/// See <https://github.com/rust-lang/rust/pull/146433> for more information. macro_rules! nonpoison_and_poison_unwrap_test { ( name: $name:ident, diff --git a/library/std/tests/sync/mutex.rs b/library/std/tests/sync/mutex.rs index 612c75c7aef..2445764001b 100644 --- a/library/std/tests/sync/mutex.rs +++ b/library/std/tests/sync/mutex.rs @@ -266,7 +266,7 @@ nonpoison_and_poison_unwrap_test!( } ); -#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")] +#[cfg(panic = "unwind")] // Requires unwinding support. nonpoison_and_poison_unwrap_test!( name: test_panics, test_body: { @@ -297,7 +297,7 @@ nonpoison_and_poison_unwrap_test!( } ); -#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")] +#[cfg(panic = "unwind")] // Requires unwinding support. nonpoison_and_poison_unwrap_test!( name: test_mutex_arc_access_in_unwind, test_body: { diff --git a/library/std/tests/sync/rwlock.rs b/library/std/tests/sync/rwlock.rs index eca15d2a4ad..65d8bac7194 100644 --- a/library/std/tests/sync/rwlock.rs +++ b/library/std/tests/sync/rwlock.rs @@ -50,7 +50,7 @@ nonpoison_and_poison_unwrap_test!( // FIXME: On macOS we use a provenance-incorrect implementation and Miri // catches that issue with a chance of around 1/1000. // See <https://github.com/rust-lang/rust/issues/121950> for details. -#[cfg_attr(all(miri, target_os = "macos"), ignore)] +#[cfg(not(all(miri, target_os = "macos")))] nonpoison_and_poison_unwrap_test!( name: frob, test_body: { @@ -124,7 +124,7 @@ nonpoison_and_poison_unwrap_test!( } ); -#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")] +#[cfg(panic = "unwind")] // Requires unwinding support. nonpoison_and_poison_unwrap_test!( name: test_rw_arc_access_in_unwind, test_body: { @@ -315,7 +315,7 @@ nonpoison_and_poison_unwrap_test!( // FIXME: On macOS we use a provenance-incorrect implementation and Miri catches that issue. // See <https://github.com/rust-lang/rust/issues/121950> for details. -#[cfg_attr(all(miri, target_os = "macos"), ignore)] +#[cfg(not(all(miri, target_os = "macos")))] nonpoison_and_poison_unwrap_test!( name: test_downgrade_observe, test_body: { @@ -362,7 +362,7 @@ nonpoison_and_poison_unwrap_test!( // FIXME: On macOS we use a provenance-incorrect implementation and Miri catches that issue. // See <https://github.com/rust-lang/rust/issues/121950> for details. -#[cfg_attr(all(miri, target_os = "macos"), ignore)] +#[cfg(not(all(miri, target_os = "macos")))] nonpoison_and_poison_unwrap_test!( name: test_downgrade_atomic, test_body: { diff --git a/library/std_detect/src/detect/os/linux/aarch64.rs b/library/std_detect/src/detect/os/linux/aarch64.rs index 87a9d6ebb88..b733b8a9eb2 100644 --- a/library/std_detect/src/detect/os/linux/aarch64.rs +++ b/library/std_detect/src/detect/os/linux/aarch64.rs @@ -140,7 +140,7 @@ struct AtHwcap { impl From<auxvec::AuxVec> for AtHwcap { /// Reads AtHwcap from the auxiliary vector. fn from(auxv: auxvec::AuxVec) -> Self { - AtHwcap { + let mut cap = AtHwcap { fp: bit::test(auxv.hwcap, 0), asimd: bit::test(auxv.hwcap, 1), // evtstrm: bit::test(auxv.hwcap, 2), @@ -207,39 +207,50 @@ impl From<auxvec::AuxVec> for AtHwcap { // smef32f32: bit::test(auxv.hwcap2, 29), smefa64: bit::test(auxv.hwcap2, 30), wfxt: bit::test(auxv.hwcap2, 31), - // ebf16: bit::test(auxv.hwcap2, 32), - // sveebf16: bit::test(auxv.hwcap2, 33), - cssc: bit::test(auxv.hwcap2, 34), - // rprfm: bit::test(auxv.hwcap2, 35), - sve2p1: bit::test(auxv.hwcap2, 36), - sme2: bit::test(auxv.hwcap2, 37), - sme2p1: bit::test(auxv.hwcap2, 38), - // smei16i32: bit::test(auxv.hwcap2, 39), - // smebi32i32: bit::test(auxv.hwcap2, 40), - smeb16b16: bit::test(auxv.hwcap2, 41), - smef16f16: bit::test(auxv.hwcap2, 42), - mops: bit::test(auxv.hwcap2, 43), - hbc: bit::test(auxv.hwcap2, 44), - sveb16b16: bit::test(auxv.hwcap2, 45), - lrcpc3: bit::test(auxv.hwcap2, 46), - lse128: bit::test(auxv.hwcap2, 47), - fpmr: bit::test(auxv.hwcap2, 48), - lut: bit::test(auxv.hwcap2, 49), - faminmax: bit::test(auxv.hwcap2, 50), - f8cvt: bit::test(auxv.hwcap2, 51), - f8fma: bit::test(auxv.hwcap2, 52), - f8dp4: bit::test(auxv.hwcap2, 53), - f8dp2: bit::test(auxv.hwcap2, 54), - f8e4m3: bit::test(auxv.hwcap2, 55), - f8e5m2: bit::test(auxv.hwcap2, 56), - smelutv2: bit::test(auxv.hwcap2, 57), - smef8f16: bit::test(auxv.hwcap2, 58), - smef8f32: bit::test(auxv.hwcap2, 59), - smesf8fma: bit::test(auxv.hwcap2, 60), - smesf8dp4: bit::test(auxv.hwcap2, 61), - smesf8dp2: bit::test(auxv.hwcap2, 62), - // pauthlr: bit::test(auxv.hwcap2, ??), + ..Default::default() + }; + + // Hardware capabilities from bits 32 to 63 should only + // be tested on LP64 targets with 64 bits `usize`. + // On ILP32 targets like `aarch64-unknown-linux-gnu_ilp32`, + // these hardware capabilities will default to `false`. + // https://github.com/rust-lang/rust/issues/146230 + #[cfg(target_pointer_width = "64")] + { + // cap.ebf16: bit::test(auxv.hwcap2, 32); + // cap.sveebf16: bit::test(auxv.hwcap2, 33); + cap.cssc = bit::test(auxv.hwcap2, 34); + // cap.rprfm: bit::test(auxv.hwcap2, 35); + cap.sve2p1 = bit::test(auxv.hwcap2, 36); + cap.sme2 = bit::test(auxv.hwcap2, 37); + cap.sme2p1 = bit::test(auxv.hwcap2, 38); + // cap.smei16i32 = bit::test(auxv.hwcap2, 39); + // cap.smebi32i32 = bit::test(auxv.hwcap2, 40); + cap.smeb16b16 = bit::test(auxv.hwcap2, 41); + cap.smef16f16 = bit::test(auxv.hwcap2, 42); + cap.mops = bit::test(auxv.hwcap2, 43); + cap.hbc = bit::test(auxv.hwcap2, 44); + cap.sveb16b16 = bit::test(auxv.hwcap2, 45); + cap.lrcpc3 = bit::test(auxv.hwcap2, 46); + cap.lse128 = bit::test(auxv.hwcap2, 47); + cap.fpmr = bit::test(auxv.hwcap2, 48); + cap.lut = bit::test(auxv.hwcap2, 49); + cap.faminmax = bit::test(auxv.hwcap2, 50); + cap.f8cvt = bit::test(auxv.hwcap2, 51); + cap.f8fma = bit::test(auxv.hwcap2, 52); + cap.f8dp4 = bit::test(auxv.hwcap2, 53); + cap.f8dp2 = bit::test(auxv.hwcap2, 54); + cap.f8e4m3 = bit::test(auxv.hwcap2, 55); + cap.f8e5m2 = bit::test(auxv.hwcap2, 56); + cap.smelutv2 = bit::test(auxv.hwcap2, 57); + cap.smef8f16 = bit::test(auxv.hwcap2, 58); + cap.smef8f32 = bit::test(auxv.hwcap2, 59); + cap.smesf8fma = bit::test(auxv.hwcap2, 60); + cap.smesf8dp4 = bit::test(auxv.hwcap2, 61); + cap.smesf8dp2 = bit::test(auxv.hwcap2, 62); + // cap.pauthlr = bit::test(auxv.hwcap2, ??); } + cap } } |