108 lines
2.9 KiB
JavaScript
108 lines
2.9 KiB
JavaScript
/* global performance */
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var perf = typeof performance !== 'undefined' && performance;
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var now = perf && perf.now
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? function () { return perf.now(); }
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: function () { return Date.now(); }
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function throwIfEmpty (name) {
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if (!name) {
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throw new Error('name must be non-empty')
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}
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}
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// simple binary sort insertion
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function insertSorted (arr, item) {
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var low = 0;
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var high = arr.length;
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var mid;
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while (low < high) {
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mid = (low + high) >>> 1; // like (num / 2) but faster
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if (arr[mid].startTime < item.startTime) {
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low = mid + 1;
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} else {
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high = mid;
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}
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}
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arr.splice(low, 0, item);
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}
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var mark;
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var stop;
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var getEntries;
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var clear;
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if (
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perf &&
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perf.mark &&
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perf.measure &&
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perf.getEntriesByName &&
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perf.getEntriesByType &&
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perf.clearMarks &&
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perf.clearMeasures &&
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// In Node, we want to detect that this perf/correctness fix [1] is available, which
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// landed in Node 16.15.0, 17.6.0, and 18.0.0. However, it's not observable, and
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// we don't want to rely on fragile version checks.
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// So we can rely on this observable change [2] to add clearResourceTimings, which
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// landed a bit later (18.2.0), but is close enough for our purposes.
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// [1]: https://github.com/nodejs/node/pull/42032
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// [2]: https://github.com/nodejs/node/pull/42725
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(true )
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) {
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mark = function (name) {
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throwIfEmpty(name);
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perf.mark(("start " + name));
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};
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stop = function (name) {
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throwIfEmpty(name);
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perf.mark(("end " + name));
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var measure = perf.measure(name, ("start " + name), ("end " + name));
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if (measure) {
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// return value from performance.measure not supported in all browsers
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// https://developer.mozilla.org/en-US/docs/Web/API/Performance/measure#browser_compatibility
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return measure
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}
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var entries = perf.getEntriesByName(name);
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return entries[entries.length - 1]
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};
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getEntries = function () { return perf.getEntriesByType('measure'); };
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clear = function () {
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perf.clearMarks();
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perf.clearMeasures();
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};
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} else {
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var marks = {};
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var entries = [];
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mark = function (name) {
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throwIfEmpty(name);
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var startTime = now();
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marks['$' + name] = startTime;
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};
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stop = function (name) {
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throwIfEmpty(name);
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var endTime = now();
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var startTime = marks['$' + name];
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if (!startTime) {
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throw new Error(("no known mark: " + name))
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}
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var entry = {
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startTime: startTime,
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name: name,
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duration: endTime - startTime,
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entryType: 'measure'
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};
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// per the spec this should be at least 150:
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// https://www.w3.org/TR/resource-timing-1/#extensions-performance-interface
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// we just have no limit, per Chrome and Edge's de-facto behavior
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insertSorted(entries, entry);
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return entry
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};
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getEntries = function () { return entries; };
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clear = function () {
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marks = {};
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entries = [];
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};
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}
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export { clear, getEntries, mark, stop };
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