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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
"use strict";
/* exported timeThis */
// Load the shared-head file first.
Services.scriptloader.loadSubScript(
this
);
// Load common.js and promisified-events.js from accessible/tests/mochitest/ for
// all tests.
loadScripts(
{ name: "common.js", dir: MOCHITESTS_DIR },
{ name: "promisified-events.js", dir: MOCHITESTS_DIR }
);
// All the A11Y metrics in tools/performance/PerfStats.h.
const ALL_A11Y_PERFSTATS =
(1 << 29) |
(1 << 30) |
(1 << 31) |
(1 << 32) |
(1 << 33) |
(1 << 34) |
(1 << 35) |
(1 << 36) |
(1 << 37) |
(1 << 38) |
(1 << 39) |
(1 << 40) |
(1 << 41) |
(1 << 42) |
(1 << 43) |
(1 << 44);
/**
* Time a function and log how long it took. The given name is included in log
* messages. All accessibility PerfStats metrics are also captured and logged.
*/
async function timeThis(name, func) {
const logPrefix = `Timing: ${name}`;
info(`${logPrefix}: begin`);
const start = performance.now();
ChromeUtils.setPerfStatsCollectionMask(ALL_A11Y_PERFSTATS);
await func();
const delta = performance.now() - start;
info(`${logPrefix}: took ${delta} ms`);
const stats = JSON.parse(await ChromeUtils.collectPerfStats());
ChromeUtils.setPerfStatsCollectionMask(0);
// Filter stuff out of stats that we don't care about.
// Filter out the GPU process, since accessibility doesn't do anything there.
stats.processes = stats.processes.filter(process => process.type != "gpu");
for (const process of stats.processes) {
// Because of weird JS -> WebIDL 64 bit number issues, we get metrics here
// that aren't for accessibility. For example, 1 << 32 also gets us 1 << 0.
// Filter those out. Also, filter out any metrics with a count of 0.
process.perfstats.metrics = process.perfstats.metrics.filter(
metric => metric.metric.startsWith("A11Y_") && metric.count > 0
);
}
// Now that we've filtered metrics, remove any processes that have no metrics left.
stats.processes = stats.processes.filter(
process => !!process.perfstats.metrics.length
);
info(`${logPrefix}: PerfStats: ${JSON.stringify(stats, null, 2)}`);
}