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Put #[repr(transparent)] attr to bevy_ptr types (#9068)

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# Objective

Fix #9064

## Solution

---

## Changelog

Enhanced: bevy_ptr types would be FFI-sefe
This commit is contained in:
fgrust 2023-07-14 14:55:15 -04:00 committed by GitHub
parent ea41a43fae
commit ede5848bf4
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1 changed files with 6 additions and 2 deletions
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8
crates/bevy_ptr/src/lib.rs
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@ -8,11 +8,12 @@ use core::{
cell::UnsafeCell, marker::PhantomData, mem::ManuallyDrop, num::NonZeroUsize, ptr::NonNull,
};
#[derive(Copy, Clone)]
/// Used as a type argument to [`Ptr`], [`PtrMut`] and [`OwningPtr`] to specify that the pointer is aligned.
pub struct Aligned;
#[derive(Copy, Clone)]
pub struct Aligned;
/// Used as a type argument to [`Ptr`], [`PtrMut`] and [`OwningPtr`] to specify that the pointer is not aligned.
#[derive(Copy, Clone)]
pub struct Unaligned;
/// Trait that is only implemented for [`Aligned`] and [`Unaligned`] to work around the lack of ability
@ -38,6 +39,7 @@ mod sealed {
/// It may be helpful to think of this type as similar to `&'a dyn Any` but without
/// the metadata and able to point to data that does not correspond to a Rust type.
#[derive(Copy, Clone)]
#[repr(transparent)]
pub struct Ptr<'a, A: IsAligned = Aligned>(NonNull<u8>, PhantomData<(&'a u8, A)>);
/// Type-erased mutable borrow of some unknown type chosen when constructing this type.
@ -51,6 +53,7 @@ pub struct Ptr<'a, A: IsAligned = Aligned>(NonNull<u8>, PhantomData<(&'a u8, A)>
///
/// It may be helpful to think of this type as similar to `&'a mut dyn Any` but without
/// the metadata and able to point to data that does not correspond to a Rust type.
#[repr(transparent)]
pub struct PtrMut<'a, A: IsAligned = Aligned>(NonNull<u8>, PhantomData<(&'a mut u8, A)>);
/// Type-erased Box-like pointer to some unknown type chosen when constructing this type.
@ -68,6 +71,7 @@ pub struct PtrMut<'a, A: IsAligned = Aligned>(NonNull<u8>, PhantomData<(&'a mut
///
/// It may be helpful to think of this type as similar to `&'a mut ManuallyDrop<dyn Any>` but
/// without the metadata and able to point to data that does not correspond to a Rust type.
#[repr(transparent)]
pub struct OwningPtr<'a, A: IsAligned = Aligned>(NonNull<u8>, PhantomData<(&'a mut u8, A)>);
macro_rules! impl_ptr {