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Bypass the lock in get_property_value.

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MozReview-Commit-ID: ECkLn5TPBDO
This commit is contained in:
Bobby Holley 2017-09-05 15:19:50 -07:00
parent 21c9ef3c6d
commit 48c95cdb6d
2 changed files with 29 additions and 3 deletions
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25
ports/geckolib/glue.rs
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@ -1124,6 +1124,20 @@ fn read_locked_arc<T, R, F>(raw: &<Locked<T> as HasFFI>::FFIType, func: F) -> R
func(Locked::<T>::as_arc(&raw).read_with(&guard))
}
#[cfg(debug_assertions)]
unsafe fn read_locked_arc_unchecked<T, R, F>(raw: &<Locked<T> as HasFFI>::FFIType, func: F) -> R
where Locked<T>: HasArcFFI, F: FnOnce(&T) -> R
{
read_locked_arc(raw, func)
}
#[cfg(not(debug_assertions))]
unsafe fn read_locked_arc_unchecked<T, R, F>(raw: &<Locked<T> as HasFFI>::FFIType, func: F) -> R
where Locked<T>: HasArcFFI, F: FnOnce(&T) -> R
{
func(Locked::<T>::as_arc(&raw).read_unchecked())
}
fn write_locked_arc<T, R, F>(raw: &<Locked<T> as HasFFI>::FFIType, func: F) -> R
where Locked<T>: HasArcFFI, F: FnOnce(&mut T) -> R
{
@ -2263,9 +2277,14 @@ macro_rules! get_property_id_from_property {
fn get_property_value(declarations: RawServoDeclarationBlockBorrowed,
property_id: PropertyId, value: *mut nsAString) {
read_locked_arc(declarations, |decls: &PropertyDeclarationBlock| {
decls.property_value_to_css(&property_id, unsafe { value.as_mut().unwrap() }).unwrap();
})
// This callsite is hot enough that the lock acquisition shows up in profiles.
// Using an unchecked read here improves our performance by ~10% on the
// microbenchmark in bug 1355599.
unsafe {
read_locked_arc_unchecked(declarations, |decls: &PropertyDeclarationBlock| {
decls.property_value_to_css(&property_id, value.as_mut().unwrap()).unwrap();
})
}
}
#[no_mangle]