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Move a few intrinsics to use Rust abi
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Move a few more intrinsic functions to the convention added in rust-lang#121192
where they have Rust abi but are tagged with `rustc_intrinsic`.
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@celinval
celinval committed Jul 4, 2024
1 parent de4f5c2 commit 87fcd2f
Showing 1 changed file with 146 additions and 57 deletions.
203 changes: 146 additions & 57 deletions core/src/intrinsics.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -947,7 +947,6 @@ extern "rust-intrinsic" {
#[rustc_const_stable(feature = "const_unreachable_unchecked", since = "1.57.0")]
#[rustc_nounwind]
pub fn unreachable() -> !;

}

/// Informs the optimizer that a condition is always true.
Expand Down Expand Up @@ -1018,78 +1017,40 @@ extern "rust-intrinsic" {
#[rustc_nounwind]
pub fn breakpoint();

/// The size of a type in bytes.
///
/// Note that, unlike most intrinsics, this is safe to call;
/// it does not require an `unsafe` block.
/// Therefore, implementations must not require the user to uphold
/// any safety invariants.
///
/// More specifically, this is the offset in bytes between successive
/// items of the same type, including alignment padding.
///
/// The stabilized version of this intrinsic is [`core::mem::size_of`].
#[cfg(bootstrap)]
#[rustc_const_stable(feature = "const_size_of", since = "1.40.0")]
#[rustc_safe_intrinsic]
#[rustc_nounwind]
pub fn size_of<T>() -> usize;

/// The minimum alignment of a type.
///
/// Note that, unlike most intrinsics, this is safe to call;
/// it does not require an `unsafe` block.
/// Therefore, implementations must not require the user to uphold
/// any safety invariants.
///
/// The stabilized version of this intrinsic is [`core::mem::align_of`].
#[cfg(bootstrap)]
#[rustc_const_stable(feature = "const_min_align_of", since = "1.40.0")]
#[rustc_safe_intrinsic]
#[rustc_nounwind]
pub fn min_align_of<T>() -> usize;
/// The preferred alignment of a type.
///
/// This intrinsic does not have a stable counterpart.
/// It's "tracking issue" is [#91971](https://github.com/rust-lang/rust/issues/91971).

#[cfg(bootstrap)]
#[rustc_const_unstable(feature = "const_pref_align_of", issue = "91971")]
#[rustc_nounwind]
pub fn pref_align_of<T>() -> usize;

/// The size of the referenced value in bytes.
///
/// The stabilized version of this intrinsic is [`crate::mem::size_of_val`].
#[cfg(bootstrap)]
#[rustc_const_unstable(feature = "const_size_of_val", issue = "46571")]
#[rustc_nounwind]
pub fn size_of_val<T: ?Sized>(_: *const T) -> usize;
/// The required alignment of the referenced value.
///
/// The stabilized version of this intrinsic is [`core::mem::align_of_val`].

#[cfg(bootstrap)]
#[rustc_const_unstable(feature = "const_align_of_val", issue = "46571")]
#[rustc_nounwind]
pub fn min_align_of_val<T: ?Sized>(_: *const T) -> usize;

/// Gets a static string slice containing the name of a type.
///
/// Note that, unlike most intrinsics, this is safe to call;
/// it does not require an `unsafe` block.
/// Therefore, implementations must not require the user to uphold
/// any safety invariants.
///
/// The stabilized version of this intrinsic is [`core::any::type_name`].
#[cfg(bootstrap)]
#[rustc_const_unstable(feature = "const_type_name", issue = "63084")]
#[rustc_safe_intrinsic]
#[rustc_nounwind]
pub fn type_name<T: ?Sized>() -> &'static str;

/// Gets an identifier which is globally unique to the specified type. This
/// function will return the same value for a type regardless of whichever
/// crate it is invoked in.
///
/// Note that, unlike most intrinsics, this is safe to call;
/// it does not require an `unsafe` block.
/// Therefore, implementations must not require the user to uphold
/// any safety invariants.
///
/// The stabilized version of this intrinsic is [`core::any::TypeId::of`].
#[cfg(bootstrap)]
#[rustc_const_unstable(feature = "const_type_id", issue = "77125")]
#[rustc_safe_intrinsic]
#[rustc_nounwind]
Expand Down Expand Up @@ -2424,15 +2385,7 @@ extern "rust-intrinsic" {
#[rustc_nounwind]
pub fn discriminant_value<T>(v: &T) -> <T as DiscriminantKind>::Discriminant;

/// Returns the number of variants of the type `T` cast to a `usize`;
/// if `T` has no variants, returns `0`. Uninhabited variants will be counted.
///
/// Note that, unlike most intrinsics, this is safe to call;
/// it does not require an `unsafe` block.
/// Therefore, implementations must not require the user to uphold
/// any safety invariants.
///
/// The to-be-stabilized version of this intrinsic is [`crate::mem::variant_count`].
#[cfg(bootstrap)]
#[rustc_const_unstable(feature = "variant_count", issue = "73662")]
#[rustc_safe_intrinsic]
#[rustc_nounwind]
Expand Down Expand Up @@ -2793,6 +2746,142 @@ pub unsafe fn vtable_align(_ptr: *const ()) -> usize {
unreachable!()
}

/// The size of a type in bytes.
///
/// Note that, unlike most intrinsics, this is safe to call;
/// it does not require an `unsafe` block.
/// Therefore, implementations must not require the user to uphold
/// any safety invariants.
///
/// More specifically, this is the offset in bytes between successive
/// items of the same type, including alignment padding.
///
/// The stabilized version of this intrinsic is [`core::mem::size_of`].
#[rustc_nounwind]
#[unstable(feature = "core_intrinsics", issue = "none")]
#[rustc_const_stable(feature = "const_size_of", since = "1.40.0")]
#[rustc_intrinsic]
#[rustc_intrinsic_must_be_overridden]
#[cfg(not(bootstrap))]
pub const fn size_of<T>() -> usize {
unreachable!()
}

/// The minimum alignment of a type.
///
/// Note that, unlike most intrinsics, this is safe to call;
/// it does not require an `unsafe` block.
/// Therefore, implementations must not require the user to uphold
/// any safety invariants.
///
/// The stabilized version of this intrinsic is [`core::mem::align_of`].
#[rustc_nounwind]
#[unstable(feature = "core_intrinsics", issue = "none")]
#[rustc_const_stable(feature = "const_min_align_of", since = "1.40.0")]
#[rustc_intrinsic]
#[rustc_intrinsic_must_be_overridden]
#[cfg(not(bootstrap))]
pub const fn min_align_of<T>() -> usize {
unreachable!()
}

/// The preferred alignment of a type.
///
/// This intrinsic does not have a stable counterpart.
/// It's "tracking issue" is [#91971](https://github.com/rust-lang/rust/issues/91971).
#[rustc_nounwind]
#[unstable(feature = "core_intrinsics", issue = "none")]
#[rustc_const_unstable(feature = "const_pref_align_of", issue = "91971")]
#[rustc_intrinsic]
#[rustc_intrinsic_must_be_overridden]
#[cfg(not(bootstrap))]
pub const unsafe fn pref_align_of<T>() -> usize {
unreachable!()
}

/// Returns the number of variants of the type `T` cast to a `usize`;
/// if `T` has no variants, returns `0`. Uninhabited variants will be counted.
///
/// Note that, unlike most intrinsics, this is safe to call;
/// it does not require an `unsafe` block.
/// Therefore, implementations must not require the user to uphold
/// any safety invariants.
///
/// The to-be-stabilized version of this intrinsic is [`crate::mem::variant_count`].
#[rustc_nounwind]
#[unstable(feature = "core_intrinsics", issue = "none")]
#[rustc_const_unstable(feature = "variant_count", issue = "73662")]
#[rustc_intrinsic]
#[rustc_intrinsic_must_be_overridden]
#[cfg(not(bootstrap))]
pub const fn variant_count<T>() -> usize {
unreachable!()
}

/// The size of the referenced value in bytes.
///
/// The stabilized version of this intrinsic is [`crate::mem::size_of_val`].
#[rustc_nounwind]
#[unstable(feature = "core_intrinsics", issue = "none")]
#[rustc_const_unstable(feature = "const_size_of_val", issue = "46571")]
#[rustc_intrinsic]
#[rustc_intrinsic_must_be_overridden]
#[cfg(not(bootstrap))]
pub const unsafe fn size_of_val<T: ?Sized>(_ptr: *const T) -> usize {
unreachable!()
}

/// The required alignment of the referenced value.
///
/// The stabilized version of this intrinsic is [`core::mem::align_of_val`].
#[rustc_nounwind]
#[unstable(feature = "core_intrinsics", issue = "none")]
#[rustc_const_unstable(feature = "const_align_of_val", issue = "46571")]
#[rustc_intrinsic]
#[rustc_intrinsic_must_be_overridden]
#[cfg(not(bootstrap))]
pub const unsafe fn min_align_of_val<T: ?Sized>(_ptr: *const T) -> usize {
unreachable!()
}

/// Gets a static string slice containing the name of a type.
///
/// Note that, unlike most intrinsics, this is safe to call;
/// it does not require an `unsafe` block.
/// Therefore, implementations must not require the user to uphold
/// any safety invariants.
///
/// The stabilized version of this intrinsic is [`core::any::type_name`].
#[rustc_nounwind]
#[unstable(feature = "core_intrinsics", issue = "none")]
#[rustc_const_unstable(feature = "const_type_name", issue = "63084")]
#[rustc_intrinsic]
#[rustc_intrinsic_must_be_overridden]
#[cfg(not(bootstrap))]
pub const fn type_name<T: ?Sized>() -> &'static str {
unreachable!()
}

/// Gets an identifier which is globally unique to the specified type. This
/// function will return the same value for a type regardless of whichever
/// crate it is invoked in.
///
/// Note that, unlike most intrinsics, this is safe to call;
/// it does not require an `unsafe` block.
/// Therefore, implementations must not require the user to uphold
/// any safety invariants.
///
/// The stabilized version of this intrinsic is [`core::any::TypeId::of`].
#[rustc_nounwind]
#[unstable(feature = "core_intrinsics", issue = "none")]
#[rustc_const_unstable(feature = "const_type_id", issue = "77125")]
#[rustc_intrinsic]
#[rustc_intrinsic_must_be_overridden]
#[cfg(not(bootstrap))]
pub const fn type_id<T: ?Sized + 'static>() -> u128 {
unreachable!()
}

/// Lowers in MIR to `Rvalue::Aggregate` with `AggregateKind::RawPtr`.
///
/// This is used to implement functions like `slice::from_raw_parts_mut` and
Expand Down

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