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lib: don't penalize setInterval() common case

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The common case is where setInterval() is called with two arguments,
the callback and the timeout.  Specifying optional arguments in
the parameter list forces common case calls to go through an arguments
adaptor stack frame.

PR-URL: https://github.com/iojs/io.js/pull/1221
Reviewed-By: Trevor Norris <trev.norris@gmail.com>
This commit is contained in:
Ben Noordhuis 2015-03-20 17:20:43 +01:00
parent 31da9758a0
commit 33fea6ed5f
1 changed files with 28 additions and 30 deletions
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58
lib/timers.js
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@ -229,24 +229,40 @@ exports.clearTimeout = function(timer) {
};
exports.setInterval = function(callback, repeat, arg1, arg2, arg3) {
exports.setInterval = function(callback, repeat) {
repeat *= 1; // coalesce to number or NaN
if (!(repeat >= 1 && repeat <= TIMEOUT_MAX)) {
repeat = 1; // schedule on next tick, follows browser behaviour
}
var args, i;
var timer = new Timeout(repeat);
var len = arguments.length - 2;
timer._onTimeout = wrapper;
timer._repeat = true;
// Initialize args once for repeated invocation of slow case below
if (len > 3) {
args = new Array(len);
for (i = 0; i < len; i++)
args[i] = arguments[i + 2];
var length = arguments.length;
var ontimeout = callback;
switch (length) {
case 0:
case 1:
case 2:
break;
case 3:
ontimeout = callback.bind(timer, arguments[2]);
break;
case 4:
ontimeout = callback.bind(timer, arguments[2], arguments[3]);
break;
case 5:
ontimeout =
callback.bind(timer, arguments[2], arguments[3], arguments[4]);
break;
default:
var args = new Array(length - 2);
for (var i = 2; i < length; i += 1)
args[i - 2] = arguments[i];
ontimeout = callback.apply.bind(callback, timer, args);
break;
}
timer._onTimeout = wrapper;
timer._repeat = ontimeout;
if (process.domain) timer.domain = process.domain;
exports.active(timer);
@ -254,27 +270,9 @@ exports.setInterval = function(callback, repeat, arg1, arg2, arg3) {
return timer;
function wrapper() {
switch (len) {
// fast cases
case 0:
callback.call(this);
break;
case 1:
callback.call(this, arg1);
break;
case 2:
callback.call(this, arg1, arg2);
break;
case 3:
callback.call(this, arg1, arg2, arg3);
break;
// slow case
default:
callback.apply(this, args);
break;
}
timer._repeat.call(this);
// If callback called clearInterval().
if (timer._repeat === false) return;
if (timer._repeat === null) return;
// If timer is unref'd (or was - it's permanently removed from the list.)
if (this._handle) {
this._handle.start(repeat, 0);