From e5cbbe05ef8d2b9878f153cd0d7d898cd5d75fa8 Mon Sep 17 00:00:00 2001
From: guzhizhou <guzhizhou28@gmail.com>
Date: Tue, 19 Nov 2019 20:22:12 +0800
Subject: events: improve performance caused by primordials
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PR-URL: https://github.com/nodejs/node/pull/30577
Refs: https://github.com/nodejs/code-and-learn/issues/97
Refs: https://github.com/nodejs/node/issues/29766
Refs: https://github.com/nodejs/node/pull/29633
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
---
 lib/events.js | 45 +++++++++++++++++++++++++++++----------------
 1 file changed, 29 insertions(+), 16 deletions(-)

(limited to 'lib/events.js')

diff --git a/lib/events.js b/lib/events.js
index 1356806f65..f3fa65153c 100644
--- a/lib/events.js
+++ b/lib/events.js
@@ -21,8 +21,21 @@
 
 'use strict';
 
-const { Math, Object, Reflect } = primordials;
-const apply = Reflect.apply;
+const {
+  Math: {
+    min: MathMin
+  },
+  Object: {
+    defineProperty: ObjectDefineProperty,
+    getPrototypeOf: ObjectGetPrototypeOf,
+    create: ObjectCreate,
+    keys: ObjectKeys,
+  },
+  Reflect: {
+    apply: ReflectApply,
+    ownKeys: ReflectOwnKeys,
+  }
+} = primordials;
 
 var spliceOne;
 
@@ -65,7 +78,7 @@ function checkListener(listener) {
   }
 }
 
-Object.defineProperty(EventEmitter, 'defaultMaxListeners', {
+ObjectDefineProperty(EventEmitter, 'defaultMaxListeners', {
   enumerable: true,
   get: function() {
     return defaultMaxListeners;
@@ -83,8 +96,8 @@ Object.defineProperty(EventEmitter, 'defaultMaxListeners', {
 EventEmitter.init = function() {
 
   if (this._events === undefined ||
-      this._events === Object.getPrototypeOf(this)._events) {
-    this._events = Object.create(null);
+      this._events === ObjectGetPrototypeOf(this)._events) {
+    this._events = ObjectCreate(null);
     this._eventsCount = 0;
   }
 
@@ -121,7 +134,7 @@ function identicalSequenceRange(a, b) {
       const rest = b.length - pos;
       if (rest > 3) {
         let len = 1;
-        const maxLen = Math.min(a.length - i, rest);
+        const maxLen = MathMin(a.length - i, rest);
         // Count the number of consecutive entries.
         while (maxLen > len && a[i + len] === b[pos + len]) {
           len++;
@@ -176,7 +189,7 @@ EventEmitter.prototype.emit = function emit(type, ...args) {
         const capture = {};
         // eslint-disable-next-line no-restricted-syntax
         Error.captureStackTrace(capture, EventEmitter.prototype.emit);
-        Object.defineProperty(er, kEnhanceStackBeforeInspector, {
+        ObjectDefineProperty(er, kEnhanceStackBeforeInspector, {
           value: enhanceStackTrace.bind(this, er, capture),
           configurable: true
         });
@@ -207,12 +220,12 @@ EventEmitter.prototype.emit = function emit(type, ...args) {
     return false;
 
   if (typeof handler === 'function') {
-    apply(handler, this, args);
+    ReflectApply(handler, this, args);
   } else {
     const len = handler.length;
     const listeners = arrayClone(handler, len);
     for (var i = 0; i < len; ++i)
-      apply(listeners[i], this, args);
+      ReflectApply(listeners[i], this, args);
   }
 
   return true;
@@ -227,7 +240,7 @@ function _addListener(target, type, listener, prepend) {
 
   events = target._events;
   if (events === undefined) {
-    events = target._events = Object.create(null);
+    events = target._events = ObjectCreate(null);
     target._eventsCount = 0;
   } else {
     // To avoid recursion in the case that type === "newListener"! Before
@@ -341,7 +354,7 @@ EventEmitter.prototype.removeListener =
 
       if (list === listener || list.listener === listener) {
         if (--this._eventsCount === 0)
-          this._events = Object.create(null);
+          this._events = ObjectCreate(null);
         else {
           delete events[type];
           if (events.removeListener)
@@ -390,11 +403,11 @@ EventEmitter.prototype.removeAllListeners =
       // Not listening for removeListener, no need to emit
       if (events.removeListener === undefined) {
         if (arguments.length === 0) {
-          this._events = Object.create(null);
+          this._events = ObjectCreate(null);
           this._eventsCount = 0;
         } else if (events[type] !== undefined) {
           if (--this._eventsCount === 0)
-            this._events = Object.create(null);
+            this._events = ObjectCreate(null);
           else
             delete events[type];
         }
@@ -403,12 +416,12 @@ EventEmitter.prototype.removeAllListeners =
 
       // Emit removeListener for all listeners on all events
       if (arguments.length === 0) {
-        for (const key of Object.keys(events)) {
+        for (const key of ObjectKeys(events)) {
           if (key === 'removeListener') continue;
           this.removeAllListeners(key);
         }
         this.removeAllListeners('removeListener');
-        this._events = Object.create(null);
+        this._events = ObjectCreate(null);
         this._eventsCount = 0;
         return this;
       }
@@ -478,7 +491,7 @@ function listenerCount(type) {
 }
 
 EventEmitter.prototype.eventNames = function eventNames() {
-  return this._eventsCount > 0 ? Reflect.ownKeys(this._events) : [];
+  return this._eventsCount > 0 ? ReflectOwnKeys(this._events) : [];
 };
 
 function arrayClone(arr, n) {
-- 
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