tools/profiler/tests/xpcshell/test_feature_js.js

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this
   3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 /**
   6  * Test that JS capturing works as expected.
   7  */
   8 add_task(async () => {
   9   const entries = 10000;
  10   const interval = 1;
  11   const threads = [];
  12   const features = ["js"];
  13
  14   await Services.profiler.StartProfiler(entries, interval, features, threads);
  15
  16   // Call the following to get a nice stack in the profiler:
  17   // functionA -> functionB -> functionC -> captureAtLeastOneJsSample
  18   const sampleIndex = await functionA();
  19
  20   const profile = await ProfilerTestUtils.stopNowAndGetProfile();
  21
  22   const [thread] = profile.threads;
  23   const { samples } = thread;
  24
  25   const inflatedStackFrames = getInflatedStackLocations(
  26     thread,
  27     samples.data[sampleIndex]
  28   );
  29
  30   expectStackToContain(
  31     inflatedStackFrames,
  32     [
  33       "(root)",
  34       "js::RunScript",
  35       // The following regexes match a string similar to:
  36       //
  37       // "functionA (/gecko/obj/_tests/xpcshell/tools/profiler/tests/xpcshell/test_feature_js.js:47:0)"
  38       // or
  39       // "functionA (test_feature_js.js:47:0)"
  40       //
  41       //          this matches the script location
  42       //          |                       match the line number
  43       //          |                       |   match the column number
  44       //          v                       v   v
  45       /^functionA \(.*test_feature_js\.js:\d+:\d+\)$/,
  46       /^functionB \(.*test_feature_js\.js:\d+:\d+\)$/,
  47       /^functionC \(.*test_feature_js\.js:\d+:\d+\)$/,
  48     ],
  49     "The stack contains a few frame labels, as well as the JS functions that we called."
  50   );
  51 });
  52
  53 function functionA() {
  54   return functionB();
  55 }
  56
  57 function functionB() {
  58   return functionC();
  59 }
  60
  61 async function functionC() {
  62   return ProfilerTestUtils.captureAtLeastOneJsSample();
  63 }