Introduce RootedTraceableBox.

This commit is contained in:
Ms2ger 2017-02-14 16:49:25 +01:00
parent 8c8eb41cdf
commit f1605ab149
2 changed files with 72 additions and 0 deletions

View file

@ -653,6 +653,61 @@ impl<'a, T: JSTraceable + 'static> Drop for RootedTraceable<'a, T> {
}
}
/// Roots any JSTraceable thing
///
/// If you have a valid DomObject, use Root.
/// If you have GC things like *mut JSObject or JSVal, use rooted!.
/// If you have an arbitrary number of DomObjects to root, use rooted_vec!.
/// If you know what you're doing, use this.
pub struct RootedTraceableBox<T: 'static + JSTraceable> {
ptr: *mut T,
}
unsafe impl<T: JSTraceable + 'static> JSTraceable for RootedTraceableBox<T> {
unsafe fn trace(&self, tracer: *mut JSTracer) {
(*self.ptr).trace(tracer);
}
}
impl<T: JSTraceable + 'static> RootedTraceableBox<T> {
/// Root a JSTraceable thing for the life of this RootedTraceable
pub fn new(traceable: T) -> RootedTraceableBox<T> {
let traceable = Box::into_raw(box traceable);
unsafe {
RootedTraceableSet::add(traceable);
}
RootedTraceableBox {
ptr: traceable,
}
}
}
impl<T: JSTraceable> Deref for RootedTraceableBox<T> {
type Target = T;
fn deref(&self) -> &T {
unsafe {
&*self.ptr
}
}
}
impl<T: JSTraceable> DerefMut for RootedTraceableBox<T> {
fn deref_mut(&mut self) -> &mut T {
unsafe {
&mut *self.ptr
}
}
}
impl<T: JSTraceable + 'static> Drop for RootedTraceableBox<T> {
fn drop(&mut self) {
unsafe {
RootedTraceableSet::remove(self.ptr);
let _ = Box::from_raw(self.ptr);
}
}
}
/// A vector of items to be rooted with `RootedVec`.
/// Guaranteed to be empty when not rooted.
/// Usage: `rooted_vec!(let mut v);` or if you have an