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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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18
components/style/gecko_string_cache/mod.rs
View file

@ -3,7 +3,6 @@
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
#![allow(unsafe_code)]
// This is needed for the constants in atom_macro.rs, because we have some
// atoms whose names differ only by case, e.g. datetime and dateTime.
#![allow(non_upper_case_globals)]
@ -30,7 +29,7 @@ use std::num::NonZeroUsize;
use std::ops::Deref;
use std::{slice, str};
use style_traits::SpecifiedValueInfo;
use to_shmem::{SharedMemoryBuilder, ToShmem};
use to_shmem::{self, SharedMemoryBuilder, ToShmem};
#[macro_use]
#[allow(improper_ctypes, non_camel_case_types, missing_docs)]
@ -132,14 +131,15 @@ impl Borrow<WeakAtom> for Atom {
}
impl ToShmem for Atom {
fn to_shmem(&self, _builder: &mut SharedMemoryBuilder) -> ManuallyDrop<Self> {
assert!(
self.is_static(),
"ToShmem failed for Atom: must be a static atom: {}",
self
);
fn to_shmem(&self, _builder: &mut SharedMemoryBuilder) -> to_shmem::Result<Self> {
if !self.is_static() {
return Err(format!(
"ToShmem failed for Atom: must be a static atom: {}",
self
));
}
ManuallyDrop::new(Atom(self.0))
Ok(ManuallyDrop::new(Atom(self.0)))
}
}