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script: Add generic root storage to StructuredCloneReader. (#36640)

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This reduces the boilerplate necessary for adding new
serializable/transferable interfaces to the structured cloning code. We
always need to root the deserialized objects when performing a read
operation, but we don't actually need the concrete object types in the
majority of cases. By storing a list of rooted JS object values, we can
push generic reflector objects into it, and extract the types we need
(MessagePort) at the very end.

Testing: Existing WPT structured cloning tests will provide coverage.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>
This commit is contained in:
Josh Matthews 2025-04-23 09:05:41 -04:00 • committed by GitHub
parent 7c1e5918a8
commit 5d3cbc67ee
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10 changed files with 73 additions and 126 deletions
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16
components/script/dom/domexception.rs
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@ -17,9 +17,9 @@ use crate::dom::bindings::reflector::{
Reflector, reflect_dom_object, reflect_dom_object_with_proto,
};
use crate::dom::bindings::root::DomRoot;
use crate::dom::bindings::serializable::{Serializable, StorageKey};
use crate::dom::bindings::serializable::Serializable;
use crate::dom::bindings::str::DOMString;
use crate::dom::bindings::structuredclone::{StructuredData, StructuredDataReader};
use crate::dom::bindings::structuredclone::StructuredData;
use crate::dom::globalscope::GlobalScope;
use crate::script_runtime::CanGc;
@ -252,18 +252,12 @@ impl Serializable for DOMException {
))
}
fn serialized_storage(
data: StructuredData<'_>,
) -> &mut Option<HashMap<DomExceptionId, Self::Data>> {
fn serialized_storage<'a>(
data: StructuredData<'a, '_>,
) -> &'a mut Option<HashMap<DomExceptionId, Self::Data>> {
match data {
StructuredData::Reader(reader) => &mut reader.exceptions,
StructuredData::Writer(writer) => &mut writer.exceptions,
}
}
fn deserialized_storage(
reader: &mut StructuredDataReader,
) -> &mut Option<HashMap<StorageKey, DomRoot<Self>>> {
&mut reader.dom_exceptions
}
}