1 files changed, 33 insertions, 0 deletions
diff --git a/js/src/devtools/gc-ubench/benchmarks/pairCyclicWeakMap.js b/js/src/devtools/gc-ubench/benchmarks/pairCyclicWeakMap.js
new file mode 100644
index 000000000..4dcb4d57e
--- /dev/null
+++ b/js/src/devtools/gc-ubench/benchmarks/pairCyclicWeakMap.js
@@ -0,0 +1,33 @@
+window.tests.set('pairCyclicWeakMap', (function() {
+var garbage = [];
+var garbageIndex = 0;
+return {
+    description: "wm1[k1] = k2; wm2[k2] = k3; wm1[k3] = k4; wm2[k4] = ...",
+
+    defaultGarbagePerFrame: "1K",
+    defaultGarbageTotal: "1K",
+
+    load: (N) => { garbage = new Array(N); },
+
+    unload: () => { garbage = []; garbageIndex = 0; },
+
+    makeGarbage: (M) => {
+        var wm1 = new WeakMap();
+        var wm2 = new WeakMap();
+        var initialKey = {};
+        var key = initialKey;
+        var value = {};
+        for (var i = 0; i < M/2; i++) {
+            wm1.set(key, value);
+            key = value;
+            value = {};
+            wm2.set(key, value);
+            key = value;
+            value = {};
+        }
+        garbage[garbageIndex++] = [ initialKey, wm1, wm2 ];
+        if (garbageIndex == garbage.length)
+            garbageIndex = 0;
+    }
+};
+})());