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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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14
components/script/dom/bindings/serializable.rs
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@ -11,7 +11,7 @@ use base::id::{Index, NamespaceIndex, PipelineNamespaceId};
use crate::dom::bindings::reflector::DomObject;
use crate::dom::bindings::root::DomRoot;
use crate::dom::bindings::structuredclone::{StructuredData, StructuredDataReader};
use crate::dom::bindings::structuredclone::StructuredData;
use crate::dom::globalscope::GlobalScope;
use crate::script_runtime::CanGc;
@ -65,13 +65,7 @@ where
/// Returns the field of [StructuredDataReader]/[StructuredDataWriter] that
/// should be used to read/store serialized instances of this type.
fn serialized_storage(
data: StructuredData<'_>,
) -> &mut Option<HashMap<NamespaceIndex<Self::Index>, Self::Data>>;
/// Returns the field of [StructuredDataReader] that should be used to store
/// deserialized instances of this type.
fn deserialized_storage(
reader: &mut StructuredDataReader,
) -> &mut Option<HashMap<StorageKey, DomRoot<Self>>>;
fn serialized_storage<'a>(
data: StructuredData<'a, '_>,
) -> &'a mut Option<HashMap<NamespaceIndex<Self::Index>, Self::Data>>;
}