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style: Gracefully handle errors creating shared memory UA style sheets.

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We still panic in a debug build, so that developers can notice when they
need to add a new static atom after modifying UA sheets.

We also add telemetry to note when this happens, add an app note to a
crash report, in case any crash later on occurs, and re-up the existing,
expired shared memory sheet telemetry probes so we can look at them
again.

Differential Revision: https://phabricator.services.mozilla.com/D73188
This commit is contained in:
Cameron McCormack 2020-05-11 00:11:45 +00:00 • committed by Emilio Cobos Álvarez
parent 709c52fefb
commit 6bae0b99ca
10 changed files with 184 additions and 122 deletions
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10
components/style/shared_lock.rs
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@ -258,20 +258,20 @@ impl<T> Locked<T> {
#[cfg(feature = "gecko")]
impl<T: ToShmem> ToShmem for Locked<T> {
fn to_shmem(&self, builder: &mut SharedMemoryBuilder) -> ManuallyDrop<Self> {
fn to_shmem(&self, builder: &mut SharedMemoryBuilder) -> to_shmem::Result<Self> {
let guard = self.shared_lock.read();
ManuallyDrop::new(Locked {
Ok(ManuallyDrop::new(Locked {
shared_lock: SharedRwLock::read_only(),
data: UnsafeCell::new(ManuallyDrop::into_inner(
self.read_with(&guard).to_shmem(builder),
self.read_with(&guard).to_shmem(builder)?,
)),
})
}))
}
}
#[cfg(feature = "servo")]
impl<T: ToShmem> ToShmem for Locked<T> {
fn to_shmem(&self, _builder: &mut SharedMemoryBuilder) -> ManuallyDrop<Self> {
fn to_shmem(&self, _builder: &mut SharedMemoryBuilder) -> to_shmem::Result<Self> {
panic!("ToShmem not supported in Servo currently")
}
}