1 files changed, 75 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/warp/map-has-symbol.js b/js/src/jit-test/tests/warp/map-has-symbol.js
new file mode 100644
index 0000000000..8dc8e96781
--- /dev/null
+++ b/js/src/jit-test/tests/warp/map-has-symbol.js
@@ -0,0 +1,75 @@
+// Similar test as "cacheir/map-has-symbol.js", except that we now perform
+// duplicate lookups to ensure GVN works properly.
+
+// Return a new map, possibly filling some dummy entries to enforce creating
+// multiple hash buckets.
+function createMap(values, n) {
+  var xs = [...values];
+  for (var i = 0; i < n; ++i) {
+    xs.push({});
+  }
+  return new Map(xs.map((x, i) => [x, i]));
+}
+
+function runTest(fn) {
+  fn(0);
+  fn(100);
+}
+
+function test_same_map(n) {
+  var xs = [Symbol(), Symbol()];
+  var ys = [Symbol(), Symbol()];
+  var zs = [...xs, ...ys];
+  var map = createMap(xs, n);
+
+  var N = 100;
+  var c = 0;
+  for (var i = 0; i < N; ++i) {
+    var z = zs[i & 3];
+    if (map.has(z)) c++;
+    if (map.has(z)) c++;
+  }
+  assertEq(c, N);
+}
+runTest(test_same_map);
+
+// Duplicate the above tests, but this time use a different map.
+
+function test_different_map(n) {
+  var xs = [Symbol(), Symbol()];
+  var ys = [Symbol(), Symbol()];
+  var zs = [...xs, ...ys];
+  var map1 = createMap(xs, n);
+  var map2 = createMap(xs, n);
+
+  var N = 100;
+  var c = 0;
+  for (var i = 0; i < N; ++i) {
+    var z = zs[i & 3];
+    if (map1.has(z)) c++;
+    if (map2.has(z)) c++;
+  }
+  assertEq(c, N);
+}
+runTest(test_different_map);
+
+// Test the alias information is correct.
+
+function test_alias(n) {
+  var xs = [Symbol(), Symbol()];
+  var map = createMap([], n);
+
+  var N = 100;
+  var c = 0;
+  for (var i = 0; i < N; ++i) {
+    var x = xs[i & 1];
+
+    map.set(x, x);
+    if (map.has(x)) c++;
+
+    map.delete(x);
+    if (map.has(x)) c++;
+  }
+  assertEq(c, N);
+}
+runTest(test_alias);