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Make get() and set() on MutNullableHeap use the correct types.

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get() must always return a rooted value, because we have no way of
ensuring the value won't be invalidated. set() takes an &T because it's
convenient; there isn't any need to expose JS<T>.
This commit is contained in:
Eli Friedman 2015-10-14 17:48:28 -07:00
parent 7a08b29201
commit 57584e74c6
11 changed files with 68 additions and 67 deletions
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31
components/script/dom/bindings/js.rs
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@ -254,16 +254,6 @@ impl<T: HeapGCValue> MutNullableHeap<T> {
ptr: UnsafeCell::new(initial)
}
}
/// Set this `MutNullableHeap` to the given value.
pub fn set(&self, val: Option<T>) {
unsafe { *self.ptr.get() = val; }
}
/// Retrieve a copy of the current optional inner value.
pub fn get(&self) -> Option<T> {
unsafe { ptr::read(self.ptr.get()) }
}
}
impl<T: Reflectable> MutNullableHeap<JS<T>> {
@ -273,10 +263,10 @@ impl<T: Reflectable> MutNullableHeap<JS<T>> {
where F: FnOnce() -> Root<T>
{
match self.get() {
Some(inner) => Root::from_rooted(inner),
Some(inner) => inner,
None => {
let inner = cb();
self.set(Some(JS::from_rooted(&inner)));
self.set(Some(&inner));
inner
},
}
@ -289,9 +279,22 @@ impl<T: Reflectable> MutNullableHeap<JS<T>> {
}
/// Get a rooted value out of this object
// FIXME(#6684)
pub fn get(&self) -> Option<Root<T>> {
unsafe {
ptr::read(self.ptr.get()).map(|o| o.root())
}
}
/// Get a rooted value out of this object
pub fn get_rooted(&self) -> Option<Root<T>> {
self.get().map(|o| o.root())
self.get()
}
/// Set this `MutNullableHeap` to the given value.
pub fn set(&self, val: Option<&T>) {
unsafe {
*self.ptr.get() = val.map(|p| JS::from_ref(p));
}
}
}