test_asm.js - mozsearch

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This test gets skipped with pattern: os == 'linux' && os_version == '18.04' && processor == 'x86_64' && tsan
Manifest: tools/profiler/tests/xpcshell/xpcshell.toml

// Check that asm.js code shows up on the stack.

add_task(async () => {

  // This test assumes that it's starting on an empty profiler stack.

  // (Note that the other profiler tests also assume the profiler

  // isn't already started.)

  Assert.ok(!Services.profiler.IsActive());

  let jsFuns = Cu.getJSTestingFunctions();

  if (!jsFuns.isAsmJSCompilationAvailable()) {

    return;

  const ms = 10;

  await Services.profiler.StartProfiler(10000, ms, ["js"]);

  let stack = null;

  function ffi_function() {

    var delayMS = 5;

    while (1) {

      let then = Date.now();

      do {

        // do nothing

      } while (Date.now() - then < delayMS);

      var thread0 = Services.profiler.getProfileData().threads[0];

      if (delayMS > 30000) {

        return;

      delayMS *= 2;

      if (!thread0.samples.data.length) {

        continue;

      var lastSample = thread0.samples.data[thread0.samples.data.length - 1];

      stack = String(getInflatedStackLocations(thread0, lastSample));

      if (stack.includes("trampoline")) {

        return;

  function asmjs_module(global, ffis) {

    "use asm";

    var ffi = ffis.ffi;

    function asmjs_function() {

      ffi();

    return asmjs_function;

  Assert.ok(jsFuns.isAsmJSModule(asmjs_module));

  var asmjs_function = asmjs_module(null, { ffi: ffi_function });

  Assert.ok(jsFuns.isAsmJSFunction(asmjs_function));

  asmjs_function();

  Assert.notEqual(stack, null);

  var i1 = stack.indexOf("entry trampoline");

  Assert.ok(i1 !== -1);

  var i2 = stack.indexOf("asmjs_function");

  Assert.ok(i2 !== -1);

  var i3 = stack.indexOf("exit trampoline");

  Assert.ok(i3 !== -1);

  var i4 = stack.indexOf("ffi_function");

  Assert.ok(i4 !== -1);

  Assert.ok(i1 < i2);

  Assert.ok(i2 < i3);

  Assert.ok(i3 < i4);

  await Services.profiler.StopProfiler();

});