bug2045307.js - mozsearch

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// |jit-test| --no-threads; --fast-warmup

gczeal(0);

// A dynamically-created atom, referenced by no script's atom list.

let holder = {["poc_" + "atom_998877"]: 1};

let s = Object.keys(holder)[0];

let idx = getAtomMarkIndex(s);

// Zone A marks the atom in its atom bitmap, then drops its reference.

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

a.s = s;

a.eval("s = null;");

// This zone keeps the atom alive only as a weakmap value.

let wm = new WeakMap();

let key = {};

wm.set(key, s);

s = holder = null;

// Compile WeakMap.prototype.get with Ion so the read goes through the

// inlined barrier fast path.

function readJit(m, k) {

  sink = m.get(k);

let warmMap = new WeakMap();

let warmKey = {};

warmMap.set(warmKey, {});

for (let i = 0; i < 100; i++) {

  readJit(warmMap, warmKey);

// Incrementally collect zone A and the atoms zone, but not this zone.

schedulezone(a);

schedulezone("atoms");

startgc(1);

while (gcstate() == "Prepare" || gcstate() == "MarkRoots") {

  gcslice(1);

assertEq(gcstate(), "Mark");

assertEq(gcstate(a), "MarkBlackOnly");

// Read the atom via the Ion path while the atoms zone is being marked. This

// needs to apply the read barrier.

readJit(wm, key);

// Finish: A refines its atom bitmap from the chunk mark bits. Without the

// barrier the atom is white and A drops it.

finishgc();

assertEq(getAtomMarkColor(a, idx), "black");