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ptr::metadata: avoid references to extern types

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This commit is contained in:
Ralf Jung 2024-07-17 13:49:32 +02:00
parent cb12b52f16
commit 21dc49c587
1 changed files with 3 additions and 2 deletions
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5
library/core/src/ptr/metadata.rs
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@ -5,6 +5,7 @@ use crate::hash::{Hash, Hasher};
use crate::intrinsics::aggregate_raw_ptr; use crate::intrinsics::aggregate_raw_ptr;
use crate::intrinsics::ptr_metadata; use crate::intrinsics::ptr_metadata;
use crate::marker::Freeze; use crate::marker::Freeze;
use crate::ptr::NonNull;
/// Provides the pointer metadata type of any pointed-to type. /// Provides the pointer metadata type of any pointed-to type.
/// ///
@ -153,7 +154,7 @@ pub const fn from_raw_parts_mut<T: ?Sized>(
/// compare equal (since identical vtables can be deduplicated within a codegen unit). /// compare equal (since identical vtables can be deduplicated within a codegen unit).
#[lang = "dyn_metadata"] #[lang = "dyn_metadata"]
pub struct DynMetadata<Dyn: ?Sized> { pub struct DynMetadata<Dyn: ?Sized> {
_vtable_ptr: &'static VTable, _vtable_ptr: NonNull<VTable>,
_phantom: crate::marker::PhantomData<Dyn>, _phantom: crate::marker::PhantomData<Dyn>,
} }
@ -174,7 +175,7 @@ impl<Dyn: ?Sized> DynMetadata<Dyn> {
fn vtable_ptr(self) -> *const VTable { fn vtable_ptr(self) -> *const VTable {
// SAFETY: this layout assumption is hard-coded into the compiler. // SAFETY: this layout assumption is hard-coded into the compiler.
// If it's somehow not a size match, the transmute will error. // If it's somehow not a size match, the transmute will error.
unsafe { crate::mem::transmute::<Self, &'static VTable>(self) } unsafe { crate::mem::transmute::<Self, *const VTable>(self) }
} }
/// Returns the size of the type associated with this vtable. /// Returns the size of the type associated with this vtable.