bug-2013561.js - mozsearch

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// Disable gczeal if available (debug builds have it, asan/release don't)

gczeal(0);

// Enable per-zone GC

gcparam('perZoneGCEnabled', 1);

// Create uncollected zone with gray root holding a symbol

var z2 = newGlobal({newCompartment: true});

z2.evaluate(`

  function storeGray(s) {

    var o = {};

    o[s] = 1;

    grayRoot().push(o);

`);

// Create WeakMap in main zone

var wm = new WeakMap();

// Create symbol and value in a function scope to avoid stack scanning

function setup() {

  var s = Symbol("key");

  z2.storeGray(s);

  var val = {data: new ArrayBuffer(256)};

  wm.set(s, val);

  // s and val go out of scope when function returns

setup();

// Full GCs to establish gray state and refine bitmaps

// After these GCs, the symbol is gray in z2's bitmap (gray-only after refinement)

gc();

gc();

// Zone GC: collect main zone + atoms, leave z2 uncollected

schedulezone(this);

schedulezone('atoms');

startgc(1);

while (gcstate() === 'Prepare') { gcslice(10); }

finishgc();

gc();