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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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29
components/derive_common/cg.rs
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@ -85,9 +85,22 @@ pub fn add_predicate(where_clause: &mut Option<syn::WhereClause>, pred: WherePre
.push(pred);
}
pub fn fmap_match<F>(input: &DeriveInput, bind_style: BindStyle, mut f: F) -> TokenStream
pub fn fmap_match<F>(input: &DeriveInput, bind_style: BindStyle, f: F) -> TokenStream
where
F: FnMut(BindingInfo) -> TokenStream,
F: FnMut(&BindingInfo) -> TokenStream,
{
fmap2_match(input, bind_style, f, |_| None)
}
pub fn fmap2_match<F, G>(
input: &DeriveInput,
bind_style: BindStyle,
mut f: F,
mut g: G,
) -> TokenStream
where
F: FnMut(&BindingInfo) -> TokenStream,
G: FnMut(&BindingInfo) -> Option<TokenStream>,
{
let mut s = synstructure::Structure::new(input);
s.variants_mut().iter_mut().for_each(|v| {
@ -95,12 +108,20 @@ where
});
s.each_variant(|variant| {
let (mapped, mapped_fields) = value(variant, "mapped");
let fields_pairs = variant.bindings().iter().zip(mapped_fields);
let fields_pairs = variant.bindings().iter().zip(mapped_fields.iter());
let mut computations = quote!();
computations.append_all(fields_pairs.map(|(field, mapped_field)| {
let expr = f(field.clone());
let expr = f(field);
quote! { let #mapped_field = #expr; }
}));
computations.append_all(
mapped_fields
.iter()
.map(|mapped_field| match g(mapped_field) {
Some(expr) => quote! { let #mapped_field = #expr; },
None => quote!(),
}),
);
computations.append_all(mapped);
Some(computations)
})