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Test Info:
// Check that the EnterJIT frame, added by the JIT trampoline and
// usable by a native unwinder to resume unwinding after encountering
// JIT code, is pushed as expected.
function run_test() {
// 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());
const ms = 5;
Services.profiler.StartProfiler(10000, ms, ["js"]);
function has_arbitrary_name_in_stack() {
// A frame for |arbitrary_name| has been pushed. Do a sequence of
// increasingly long spins until we get a sample.
var delayMS = 5;
while (1) {
info("loop: ms = " + delayMS);
const then = Date.now();
do {
let n = 10000;
// eslint-disable-next-line no-empty
while (--n) {} // OSR happens here
// Spin in the hope of getting a sample.
} while (Date.now() - then < delayMS);
let profile = Services.profiler.getProfileData().threads[0];
// Go through all of the stacks, and search for this function name.
for (const sample of profile.samples.data) {
const stack = getInflatedStackLocations(profile, sample);
info(`The following stack was found: ${stack}`);
for (var i = 0; i < stack.length; i++) {
if (stack[i].match(/arbitrary_name/)) {
// This JS sample was correctly found.
return true;
}
}
}
// Continue running this function with an increasingly long delay.
delayMS *= 2;
if (delayMS > 30000) {
return false;
}
}
}
Assert.ok(
has_arbitrary_name_in_stack(),
"A JS frame was found before the test timeout."
);
Services.profiler.StopProfiler();
}