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performance.ts
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95 lines (85 loc) · 3.2 KB
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/*@internal*/
namespace ts {
declare const performance: { now?(): number } | undefined;
/** Gets a timestamp with (at least) ms resolution */
export const timestamp = typeof performance !== "undefined" && performance.now ? () => performance.now() : Date.now ? Date.now : () => +(new Date());
}
/*@internal*/
/** Performance measurements for the compiler. */
namespace ts.performance {
declare const onProfilerEvent: { (markName: string): void; profiler: boolean; };
const profilerEvent = typeof onProfilerEvent === "function" && onProfilerEvent.profiler === true
? onProfilerEvent
: (_markName: string) => { };
let enabled = false;
let profilerStart = 0;
let counts: Map<number>;
let marks: Map<number>;
let measures: Map<number>;
/**
* Marks a performance event.
*
* @param markName The name of the mark.
*/
export function mark(markName: string) {
if (enabled) {
marks[markName] = timestamp();
counts[markName] = (counts[markName] || 0) + 1;
profilerEvent(markName);
}
}
/**
* Adds a performance measurement with the specified name.
*
* @param measureName The name of the performance measurement.
* @param startMarkName The name of the starting mark. If not supplied, the point at which the
* profiler was enabled is used.
* @param endMarkName The name of the ending mark. If not supplied, the current timestamp is
* used.
*/
export function measure(measureName: string, startMarkName?: string, endMarkName?: string) {
if (enabled) {
const end = endMarkName && marks[endMarkName] || timestamp();
const start = startMarkName && marks[startMarkName] || profilerStart;
measures[measureName] = (measures[measureName] || 0) + (end - start);
}
}
/**
* Gets the number of times a marker was encountered.
*
* @param markName The name of the mark.
*/
export function getCount(markName: string) {
return counts && counts[markName] || 0;
}
/**
* Gets the total duration of all measurements with the supplied name.
*
* @param measureName The name of the measure whose durations should be accumulated.
*/
export function getDuration(measureName: string) {
return measures && measures[measureName] || 0;
}
/**
* Iterate over each measure, performing some action
*
* @param cb The action to perform for each measure
*/
export function forEachMeasure(cb: (measureName: string, duration: number) => void) {
for (const key in measures) {
cb(key, measures[key]);
}
}
/** Enables (and resets) performance measurements for the compiler. */
export function enable() {
counts = createMap<number>();
marks = createMap<number>();
measures = createMap<number>();
enabled = true;
profilerStart = timestamp();
}
/** Disables performance measurements for the compiler. */
export function disable() {
enabled = false;
}
}