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perf(ext/web): optimize EventTarget (#12166)

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and all its subclasses including `AbortSignal` ...

Instead of storing associated data in a global `WeakMap` we store them as private attributes (via a Symbol) on the object instances
This commit is contained in:
Aaron O'Mullan 2021-09-21 17:51:44 +02:00 committed by GitHub
parent f827b93df4
commit 0aa6fefce7
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 12 additions and 21 deletions
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33
ext/web/02_event.js
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@ -34,9 +34,6 @@
SymbolFor,
SymbolToStringTag,
TypeError,
WeakMap,
WeakMapPrototypeGet,
WeakMapPrototypeSet,
} = window.__bootstrap.primordials;
// accessors for non runtime visible data
@ -842,32 +839,30 @@
// Accessors for non-public data
const eventTargetData = new WeakMap();
const eventTargetData = Symbol();
function setEventTargetData(value) {
WeakMapPrototypeSet(eventTargetData, value, getDefaultTargetData());
function setEventTargetData(target) {
target[eventTargetData] = getDefaultTargetData();
}
function getAssignedSlot(target) {
return Boolean(WeakMapPrototypeGet(eventTargetData, target)?.assignedSlot);
return Boolean(target?.[eventTargetData]?.assignedSlot);
}
function getHasActivationBehavior(target) {
return Boolean(
WeakMapPrototypeGet(eventTargetData, target)?.hasActivationBehavior,
);
return Boolean(target?.[eventTargetData]?.hasActivationBehavior);
}
function getHost(target) {
return WeakMapPrototypeGet(eventTargetData, target)?.host ?? null;
return target?.[eventTargetData]?.host ?? null;
}
function getListeners(target) {
return WeakMapPrototypeGet(eventTargetData, target)?.listeners ?? {};
return target?.[eventTargetData]?.listeners ?? {};
}
function getMode(target) {
return WeakMapPrototypeGet(eventTargetData, target)?.mode ?? null;
return target?.[eventTargetData]?.mode ?? null;
}
function getDefaultTargetData() {
@ -882,7 +877,7 @@
class EventTarget {
constructor() {
WeakMapPrototypeSet(eventTargetData, this, getDefaultTargetData());
this[eventTargetData] = getDefaultTargetData();
}
addEventListener(
@ -898,10 +893,7 @@
}
options = normalizeAddEventHandlerOptions(options);
const { listeners } = WeakMapPrototypeGet(
eventTargetData,
this ?? globalThis,
);
const { listeners } = (this ?? globalThis)[eventTargetData];
if (!(type in listeners)) {
listeners[type] = [];
@ -946,8 +938,7 @@
prefix: "Failed to execute 'removeEventListener' on 'EventTarget'",
});
const listeners =
WeakMapPrototypeGet(eventTargetData, this ?? globalThis).listeners;
const { listeners } = (this ?? globalThis)[eventTargetData];
if (callback !== null && type in listeners) {
listeners[type] = ArrayPrototypeFilter(
listeners[type],
@ -980,7 +971,7 @@
});
const self = this ?? globalThis;
const listeners = WeakMapPrototypeGet(eventTargetData, self).listeners;
const { listeners } = self[eventTargetData];
if (!(event.type in listeners)) {
setTarget(event, this);
return true;