test_HeapSnapshot_takeCensus_04.js

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/* Any copyright is dedicated to the Public Domain.

   http://creativecommons.org/publicdomain/zero/1.0/ */

"use strict";

// Test that HeapSnapshot.prototype.takeCensus finds GC roots that are on the

// stack.

//

// Ported from js/src/jit-test/tests/debug/Memory-takeCensus-04.js

function run_test() {

  const g = newGlobal();

  const dbg = new Debugger(g);

  g.eval(`

function withAllocationMarkerOnStack(f) {

  (function () {

    var onStack = allocationMarker();

    f();

  }());

`);

  equal(

    "AllocationMarker" in saveHeapSnapshotAndTakeCensus(dbg).objects,

    false,

    "There shouldn't exist any allocation markers in the census."

);

  let allocationMarkerCount;

  g.withAllocationMarkerOnStack(() => {

    const census = saveHeapSnapshotAndTakeCensus(dbg);

    allocationMarkerCount = census.objects.AllocationMarker.count;

});

  equal(

    allocationMarkerCount,

1,

    "Should have one allocation marker in the census, because there " +

      "was one on the stack."

);

  do_test_finished();