bug-1994871.js - mozsearch

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// Check that atom marking bitmap state and mark color is as expected and

// AtomMarkingRuntime::refineZoneBitmapsForCollectedZones works with gray

// symbols.

gczeal(0);

// We'll track the state of a symbol in two zones, |this| and |other|.

let s = Symbol();

addMarkObservers([s]);

let other = newGlobal({newCompartment: true});

// Iniitally we expect the symbol to be marked black in |this| and not marked

// in |other|.

gc();

let index = getAtomMarkIndex(s);

assertEq(getAtomMarkColor(this, index), 'black');

assertEq(getAtomMarkColor(other, index), 'white');

assertEq(getMarks()[0], 'black');

// Referencing the symbol in |other| marks it in that zone.

other.s = s;

assertEq(getAtomMarkColor(other, index), 'black');

// Replace existing references with a gray reference from |this| and remove

// the reference from |other|. We now expect the mark color to be gray in

// *both* zones.

grayRoot().push(s);

other.s = undefined;

s = undefined;

gc();

assertEq(getAtomMarkColor(this, index), 'gray');

assertEq(getAtomMarkColor(other, index), 'gray');

assertEq(getMarks()[0], 'gray');

// Removing the final reference results in the mark color going to white.

grayRoot().length = 0;

gc();

assertEq(getAtomMarkColor(this, index), 'white');

assertEq(getAtomMarkColor(other, index), 'white');

assertEq(getMarks()[0], 'dead');