test_onGarbageCollection-04.js

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// Test that the onGarbageCollection reentrancy guard is on a per Debugger

// basis. That is if our first Debugger is observing our second Debugger's

// compartment, and this second Debugger triggers a GC inside its

// onGarbageCollection hook, the first Debugger's onGarbageCollection hook is

// still called.

//

// This is the scenario we are setting up: top level debugging the `debuggeree`

// global, which is debugging the `debuggee` global. Then, we trigger the

// following events:

//

//     debuggee gc

//         |

//         V

//     debuggeree's onGarbageCollection

//         |

//         V

//     debuggeree gc

//         |

//         V

//     top level onGarbageCollection

//

// Note that the top level's onGarbageCollection hook should be fired, at the

// same time that we are preventing reentrancy into debuggeree's

// onGarbageCollection hook.

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function run_test() {

  do_test_pending();

  const debuggeree = newGlobal();

  const debuggee = debuggeree.debuggee = newGlobal();

  debuggeree.eval(

    var dbg = new Debugger(this.debuggee);

    var fired = 0;

    dbg.memory.onGarbageCollection = _ => {

      fired++;

      gc(this);

};

);

  const dbg = new Debugger(debuggeree);

  let fired = 0;

  dbg.memory.onGarbageCollection = _ => {

    fired++;

};

  debuggee.eval(`gc(this)`);

  // Let first onGarbageCollection runnable get run.

  executeSoon(() => {

    // Let second onGarbageCollection runnable get run.

    executeSoon(() => {

      // Even though we request GC'ing a single zone, we can't rely on that

      // behavior and both zones could have been scheduled for gc for both

      // gc(this) calls.

      ok(debuggeree.fired >= 1);

      ok(fired >= 1);

      debuggeree.dbg.removeAllDebuggees();

      do_test_finished();

});

});