test_onGarbageCollection-05.js

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// Test that the onGarbageCollection hook reports its gc cycle's number (aka the

// major GC number) and that it is monotonically increasing.

const root = newGlobal();

const dbg = new Debugger();

const wrappedRoot = dbg.addDebuggee(root)

Services.prefs.setBoolPref("security.allow_eval_with_system_principal", true);

registerCleanupFunction(() => {

  Services.prefs.clearUserPref("security.allow_eval_with_system_principal");

});

function run_test() {

  do_test_pending();

  let numFired = 0;

  let lastGCCycleNumber = undefined;

  (function loop() {

    if (numFired == 10) {

      dbg.memory.onGarbageCollection = undefined;

      dbg.enabled = false;

      return void do_test_finished();

    dbg.memory.onGarbageCollection = data => {

      print("onGarbageCollection: " + uneval(data));

      if (numFired != 0) {

        equal(typeof lastGCCycleNumber, "number");

        equal(data.gcCycleNumber - lastGCCycleNumber, 1);

      numFired++;

      lastGCCycleNumber = data.gcCycleNumber;

      executeSoon(loop);

};

    root.eval("gc(this)");

  }());