test_feature_js.js

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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

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/**

 * Test that JS capturing works as expected.

*/

add_task(async () => {

  const entries = 10000;

  const interval = 1;

  const threads = [];

  const features = ["js"];

  await Services.profiler.StartProfiler(entries, interval, features, threads);

  // Call the following to get a nice stack in the profiler:

  // functionA -> functionB -> functionC -> captureAtLeastOneJsSample

  const sampleIndex = await functionA();

  const profile = await stopNowAndGetProfile();

  const [thread] = profile.threads;

  const { samples } = thread;

  const inflatedStackFrames = getInflatedStackLocations(

    thread,

    samples.data[sampleIndex]

);

  expectStackToContain(

    inflatedStackFrames,

      "(root)",

      "js::RunScript",

      // The following regexes match a string similar to:

//

      // "functionA (/gecko/obj/_tests/xpcshell/tools/profiler/tests/xpcshell/test_feature_js.js:47:0)"

      // or

      // "functionA (test_feature_js.js:47:0)"

//

      //          this matches the script location

      //          |                       match the line number

      //          |                       |   match the column number

      //          v                       v   v

      /^functionA \(.*test_feature_js\.js:\d+:\d+\)$/,

      /^functionB \(.*test_feature_js\.js:\d+:\d+\)$/,

      /^functionC \(.*test_feature_js\.js:\d+:\d+\)$/,

],

    "The stack contains a few frame labels, as well as the JS functions that we called."

);

});

function functionA() {

  return functionB();

function functionB() {

  return functionC();

async function functionC() {

  return captureAtLeastOneJsSample();