set-has-object.js - mozsearch

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// Similar test as "cacheir/set-has-object.js", except that we now perform

// duplicate lookups to ensure GVN works properly.

// Return a new set, possibly filling some dummy entries to enforce creating

// multiple hash buckets.

function createSet(values, n) {

  var xs = [...values];

  for (var i = 0; i < n; ++i) {

    xs.push({});

  return new Set(xs);

function runTest(fn) {

  fn(0);

  fn(100);

function test_same_set(n) {

  var xs = [{}, {}];

  var ys = [{}, {}];

  var zs = [...xs, ...ys];

  var set = createSet(xs, n);

  var N = 100;

  var c = 0;

  for (var i = 0; i < N; ++i) {

    var z = zs[i & 3];

    if (set.has(z)) c++;

    if (set.has(z)) c++;

  assertEq(c, N);

runTest(test_same_set);

// Duplicate the above tests, but this time use a different set.

function test_different_set(n) {

  var xs = [{}, {}];

  var ys = [{}, {}];

  var zs = [...xs, ...ys];

  var set1 = createSet(xs, n);

  var set2 = createSet(xs, n);

  var N = 100;

  var c = 0;

  for (var i = 0; i < N; ++i) {

    var z = zs[i & 3];

    if (set1.has(z)) c++;

    if (set2.has(z)) c++;

  assertEq(c, N);

runTest(test_different_set);

// Test the alias information is correct.

function test_alias(n) {

  var xs = [{}, {}];

  var set = createSet([], n);

  var N = 100;

  var c = 0;

  for (var i = 0; i < N; ++i) {

    var x = xs[i & 1];

    set.add(x);

    if (set.has(x)) c++;

    set.delete(x);

    if (set.has(x)) c++;

  assertEq(c, N);

runTest(test_alias);

// And finally test that we don't actually support GVN for objects, because the

// hash changes when moving an object.

function testRekey() {

  var set = new Set();

  var c = 0;

  var N = 100;

  for (var i = 0; i < N; ++i) {

    var k = {};

    set.add(k);

    if (set.has(k)) c++;

    minorgc();

    if (set.has(k)) c++;

  assertEq(c, N * 2);

testRekey();