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script: Use enums for event loop senders and receivers (#34896)

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Previously, senders and receivers to different kinds of event loops (the
main `ScriptThread`, different types of workers) used a rust `trait`
mechanism to implement dynamic behavior. This led to having many unused
implementations of this `trait`. This change moves to using an `enum`
based approach for these senders and receivers and removes all of the
dead code.

In addition, to allowing for use of rust's dead code detection, it
simplifies the code a great deal. All of these generic senders and
receivers are moved to the `messaging.rs` file and given proper
documentation.

Finally, empty an `JSTraceable` implementation is made for all
crossbeam `Sender<...>`s to avoid having to manually skip them everytime
they are included in structs. The pre-existing empty `MallocSizeOf`
implementation is used more thoroughly.

Other unecessary wrappers around these senders and receivers are removed
as well.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Martin Robinson 2025-01-08 22:33:29 +01:00 • committed by GitHub
parent 82ac8d41d0
commit 77bc7f415d
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18 changed files with 217 additions and 325 deletions
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5
components/script/dom/workerglobalscope.rs
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@ -56,8 +56,9 @@ use crate::dom::window::{base64_atob, base64_btoa};
use crate::dom::workerlocation::WorkerLocation;
use crate::dom::workernavigator::WorkerNavigator;
use crate::fetch;
use crate::messaging::{CommonScriptMsg, ScriptEventLoopReceiver, ScriptEventLoopSender};
use crate::realms::{enter_realm, InRealm};
use crate::script_runtime::{CanGc, CommonScriptMsg, JSContext, Runtime, ScriptChan, ScriptPort};
use crate::script_runtime::{CanGc, JSContext, Runtime};
use crate::task::TaskCanceller;
use crate::timers::{IsInterval, TimerCallback};
@ -491,7 +492,7 @@ impl WorkerGlobalScope {
}
}
pub fn new_script_pair(&self) -> (Box<dyn ScriptChan + Send>, Box<dyn ScriptPort + Send>) {
pub(crate) fn new_script_pair(&self) -> (ScriptEventLoopSender, ScriptEventLoopReceiver) {
let dedicated = self.downcast::<DedicatedWorkerGlobalScope>();
if let Some(dedicated) = dedicated {
dedicated.new_script_pair()