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Add safety comments

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This commit is contained in:
bjorn3 2021-06-09 14:51:42 +02:00
parent e1aa45b64d
commit 2754d4e514
1 changed files with 5 additions and 0 deletions
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5
compiler/rustc_interface/src/passes.rs
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@ -123,6 +123,9 @@ mod boxed_resolver {
resolver: None,
_pin: PhantomPinned,
});
// SAFETY: `make_resolver` takes a resolver arena with an arbitrary lifetime and
// returns a resolver with the same lifetime as the arena. We ensure that the arena
// outlives the resolver in the drop impl and elsewhere so these transmutes are sound.
unsafe {
let (crate_, resolver) = make_resolver(
std::mem::transmute::<&Session, &Session>(&boxed_resolver.session),
@ -137,6 +140,7 @@ mod boxed_resolver {
}
pub fn access<F: for<'a> FnOnce(&mut Resolver<'a>) -> R, R>(&mut self, f: F) -> R {
// SAFETY: The resolver doesn't need to be pinned.
let mut resolver = unsafe {
self.0.as_mut().map_unchecked_mut(|boxed_resolver| &mut boxed_resolver.resolver)
};
@ -147,6 +151,7 @@ mod boxed_resolver {
match Rc::try_unwrap(resolver) {
Ok(resolver) => {
let mut resolver = resolver.into_inner();
// SAFETY: The resolver doesn't need to be pinned.
let mut resolver = unsafe {
resolver
.0