react-native/Libraries/Performance/CPUProfiler.js

44 lines
1008 B
JavaScript

/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @providesModule CPUProfiler
* @flow
*/
'use strict';
var _label;
var _nestingLevel = 0;
var CPUProfiler = {
start(profileName: string) {
if (_nestingLevel === 0) {
if (global.nativeProfilerStart) {
_label = profileName;
global.nativeProfilerStart(profileName);
} else if (console.profile) {
console.profile(profileName);
}
}
_nestingLevel++;
},
end() {
_nestingLevel--;
if (_nestingLevel === 0) {
if (global.nativeProfilerEnd) {
global.nativeProfilerEnd(_label);
} else if (console.profileEnd) {
console.profileEnd();
}
_label = undefined;
}
}
};
module.exports = CPUProfiler;