process: improve nextTick performance

PR-URL: https://github.com/nodejs/node/pull/25461
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

1 files changed, 22 insertions, 20 deletions

diff --git a/lib/internal/process/task_queues.js b/lib/internal/process/task_queues.js
index 68b5d8b343..8906b4aa1e 100644
--- a/lib/internal/process/task_queues.js
+++ b/lib/internal/process/task_queues.js
@@ -71,10 +71,18 @@ function processTicksAndRejections() {
 
       try {
         const callback = tock.callback;
-        if (tock.args === undefined)
+        if (tock.args === undefined) {
           callback();
-        else
-          callback(...tock.args);
+        } else {
+          const args = tock.args;
+          switch (args.length) {
+            case 1: callback(args[0]); break;
+            case 2: callback(args[0], args[1]); break;
+            case 3: callback(args[0], args[1], args[2]); break;
+            case 4: callback(args[0], args[1], args[2], args[3]); break;
+            default: callback(...args);
+          }
+        }
       } finally {
         if (destroyHooksExist())
           emitDestroy(asyncId);
@@ -88,22 +96,6 @@ function processTicksAndRejections() {
   setHasRejectionToWarn(false);
 }
 
-class TickObject {
-  constructor(callback, args) {
-    this.callback = callback;
-    this.args = args;
-
-    const asyncId = newAsyncId();
-    const triggerAsyncId = getDefaultTriggerAsyncId();
-    this[async_id_symbol] = asyncId;
-    this[trigger_async_id_symbol] = triggerAsyncId;
-
-    if (initHooksExist()) {
-      emitInit(asyncId, 'TickObject', triggerAsyncId, this);
-    }
-  }
-}
-
 // `nextTick()` will not enqueue any callback when the process is about to
 // exit since the callback would not have a chance to be executed.
 function nextTick(callback) {
@@ -127,7 +119,17 @@ function nextTick(callback) {
 
   if (queue.isEmpty())
     setHasTickScheduled(true);
-  queue.push(new TickObject(callback, args));
+  const asyncId = newAsyncId();
+  const triggerAsyncId = getDefaultTriggerAsyncId();
+  const tickObject = {
+    [async_id_symbol]: asyncId,
+    [trigger_async_id_symbol]: triggerAsyncId,
+    callback,
+    args
+  };
+  if (initHooksExist())
+    emitInit(asyncId, 'TickObject', triggerAsyncId, tickObject);
+  queue.push(tickObject);
 }
 
 let AsyncResource;