From ec63b36994527d0969d8083a6c4be8cd325c7473 Mon Sep 17 00:00:00 2001 From: Marcos Casagrande Date: Thu, 17 Aug 2023 10:35:18 +0200 Subject: [PATCH] perf(ext/event): optimize Event constructor (#20181) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This PR optimizes `Event` constructor - ~Added a fast path for empty `eventInitDict`~ Removed `EventInit` dictionary converter - Don't make `isTrusted` a [LegacyUnforgeable](https://webidl.spec.whatwg.org/#LegacyUnforgeable) property. Doing so makes it non-spec compliant but calling `Object/Reflect.defineProperty` on the constructor is a big bottleneck. Node did the same a few months ago https://github.com/nodejs/node/pull/46974. In my opinion, the performance gains are worth deviating from the spec for a browser-related property. **This PR** ``` cpu: 13th Gen Intel(R) Core(TM) i9-13900H runtime: deno 1.36.1 (x86_64-unknown-linux-gnu) benchmark time (avg) iter/s (min … max) p75 p99 p995 ------------------------------------------------------------------------------- ----------------------------- event constructor no init 36.69 ns/iter 27,257,504.6 (33.36 ns … 42.45 ns) 37.71 ns 39.61 ns 40.07 ns event constructor 36.7 ns/iter 27,246,776.6 (33.35 ns … 56.03 ns) 37.73 ns 40.14 ns 41.74 ns ``` **main** ``` cpu: 13th Gen Intel(R) Core(TM) i9-13900H runtime: deno 1.36.1 (x86_64-unknown-linux-gnu) benchmark time (avg) iter/s (min … max) p75 p99 p995 ------------------------------------------------------------------------------- ----------------------------- event constructor no init 380.48 ns/iter 2,628,275.8 (366.66 ns … 399.39 ns) 384.58 ns 398.27 ns 399.39 ns event constructor 480.33 ns/iter 2,081,882.6 (466.67 ns … 503.47 ns) 484.27 ns 501.28 ns 503.47 ns ``` ```js Deno.bench("event constructor no init", () => { const event = new Event("foo"); }); Deno.bench("event constructor", () => { const event = new Event("foo", { bubbles: true, cancelable: false }); }); ``` towards https://github.com/denoland/deno/issues/20167 --- cli/tests/unit/event_test.ts | 15 +------ ext/web/02_event.js | 78 ++++++++++++++---------------------- tools/wpt/expectation.json | 4 +- 3 files changed, 34 insertions(+), 63 deletions(-) diff --git a/cli/tests/unit/event_test.ts b/cli/tests/unit/event_test.ts index d81023da1359ba..88ff803af7df85 100644 --- a/cli/tests/unit/event_test.ts +++ b/cli/tests/unit/event_test.ts @@ -1,5 +1,5 @@ // Copyright 2018-2023 the Deno authors. All rights reserved. MIT license. -import { assert, assertEquals, assertStringIncludes } from "./test_util.ts"; +import { assertEquals, assertStringIncludes } from "./test_util.ts"; Deno.test(function eventInitializedWithType() { const type = "click"; @@ -80,19 +80,6 @@ Deno.test(function eventInitializedWithNonStringType() { assertEquals(event.cancelable, false); }); -// ref https://github.com/web-platform-tests/wpt/blob/master/dom/events/Event-isTrusted.any.js -Deno.test(function eventIsTrusted() { - const desc1 = Object.getOwnPropertyDescriptor(new Event("x"), "isTrusted"); - assert(desc1); - assertEquals(typeof desc1.get, "function"); - - const desc2 = Object.getOwnPropertyDescriptor(new Event("x"), "isTrusted"); - assert(desc2); - assertEquals(typeof desc2!.get, "function"); - - assertEquals(desc1!.get, desc2!.get); -}); - Deno.test(function eventInspectOutput() { // deno-lint-ignore no-explicit-any const cases: Array<[any, (event: any) => string]> = [ diff --git a/ext/web/02_event.js b/ext/web/02_event.js index 859da2121787c1..d59a897a62672c 100644 --- a/ext/web/02_event.js +++ b/ext/web/02_event.js @@ -122,20 +122,6 @@ const isTrusted = ObjectGetOwnPropertyDescriptor({ }, }, "isTrusted").get; -webidl.converters.EventInit = webidl.createDictionaryConverter("EventInit", [{ - key: "bubbles", - defaultValue: false, - converter: webidl.converters.boolean, -}, { - key: "cancelable", - defaultValue: false, - converter: webidl.converters.boolean, -}, { - key: "composed", - defaultValue: false, - converter: webidl.converters.boolean, -}]); - const _attributes = Symbol("[[attributes]]"); const _canceledFlag = Symbol("[[canceledFlag]]"); const _stopPropagationFlag = Symbol("[[stopPropagationFlag]]"); @@ -161,36 +147,7 @@ class Event { this[_isTrusted] = false; this[_path] = []; - if (!eventInitDict[_skipInternalInit]) { - webidl.requiredArguments( - arguments.length, - 1, - "Failed to construct 'Event'", - ); - type = webidl.converters.DOMString( - type, - "Failed to construct 'Event'", - "Argument 1", - ); - const eventInit = webidl.converters.EventInit( - eventInitDict, - "Failed to construct 'Event'", - "Argument 2", - ); - this[_attributes] = { - type, - ...eventInit, - currentTarget: null, - eventPhase: Event.NONE, - target: null, - timeStamp: DateNow(), - }; - // [LegacyUnforgeable] - ReflectDefineProperty(this, "isTrusted", { - enumerable: true, - get: isTrusted, - }); - } else { + if (eventInitDict?.[_skipInternalInit]) { this[_attributes] = { type, data: eventInitDict.data ?? null, @@ -202,10 +159,30 @@ class Event { target: null, timeStamp: 0, }; - // TODO(@littledivy): Not spec compliant but performance is hurt badly - // for users of `_skipInternalInit`. - this.isTrusted = false; + return; } + + webidl.requiredArguments( + arguments.length, + 1, + "Failed to construct 'Event'", + ); + type = webidl.converters.DOMString( + type, + "Failed to construct 'Event'", + "Argument 1", + ); + + this[_attributes] = { + type, + bubbles: !!eventInitDict.bubbles, + cancelable: !!eventInitDict.cancelable, + composed: !!eventInitDict.composed, + currentTarget: null, + eventPhase: Event.NONE, + target: null, + timeStamp: DateNow(), + }; } [SymbolFor("Deno.privateCustomInspect")](inspect) { @@ -435,6 +412,13 @@ class Event { } } +// Not spec compliant. The spec defines it as [LegacyUnforgeable] +// but doing so has a big performance hit +ReflectDefineProperty(Event.prototype, "isTrusted", { + enumerable: true, + get: isTrusted, +}); + function defineEnumerableProps( Ctor, props, diff --git a/tools/wpt/expectation.json b/tools/wpt/expectation.json index 326b7f55d3b9fe..c3deef9bd12048 100644 --- a/tools/wpt/expectation.json +++ b/tools/wpt/expectation.json @@ -2229,8 +2229,8 @@ ], "AddEventListenerOptions-signal.any.html": true, "AddEventListenerOptions-signal.any.worker.html": true, - "Event-isTrusted.any.html": true, - "Event-isTrusted.any.worker.html": true, + "Event-isTrusted.any.html": false, + "Event-isTrusted.any.worker.html": false, "EventTarget-add-remove-listener.any.html": true, "EventTarget-add-remove-listener.any.worker.html": true, "EventTarget-addEventListener.any.html": true,