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-rw-r--r--js/xpconnect/tests/unit/test_onGarbageCollection-01.js69
1 files changed, 69 insertions, 0 deletions
diff --git a/js/xpconnect/tests/unit/test_onGarbageCollection-01.js b/js/xpconnect/tests/unit/test_onGarbageCollection-01.js
new file mode 100644
index 0000000000..81ac713865
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+++ b/js/xpconnect/tests/unit/test_onGarbageCollection-01.js
@@ -0,0 +1,69 @@
+// Test basic usage of onGarbageCollection
+
+const root = newGlobal();
+const dbg = new Debugger();
+const wrappedRoot = dbg.addDebuggee(root)
+
+const NUM_SLICES = root.NUM_SLICES = 10;
+
+let fired = false;
+let slicesFound = 0;
+
+Services.prefs.setBoolPref("security.allow_eval_with_system_principal", true);
+registerCleanupFunction(() => {
+ Services.prefs.clearUserPref("security.allow_eval_with_system_principal");
+});
+
+dbg.memory.onGarbageCollection = data => {
+ fired = true;
+
+ print("Got onGarbageCollection: " + JSON.stringify(data, null, 2));
+
+ equal(typeof data.reason, "string");
+ equal(typeof data.nonincrementalReason == "string" || data.nonincrementalReason === null,
+ true);
+
+ let lastStartTimestamp = 0;
+ for (let i = 0; i < data.collections.length; i++) {
+ let slice = data.collections[i];
+
+ equal(slice.startTimestamp >= lastStartTimestamp, true);
+ equal(slice.startTimestamp <= slice.endTimestamp, true);
+
+ lastStartTimestamp = slice.startTimestamp;
+ }
+
+ equal(data.collections.length >= 1, true);
+ slicesFound += data.collections.length;
+}
+
+function run_test() {
+ do_test_pending();
+
+ root.eval(
+ `
+ this.allocs = [];
+
+ // GC slices
+ for (var i = 0; i < NUM_SLICES; i++) {
+ this.allocs.push({});
+ gcslice();
+ }
+
+ // Full GC
+ this.allocs.push({});
+ gc();
+ `
+ );
+
+ executeSoon(() => {
+ equal(fired, true, "The GC hook should have fired at least once");
+
+ // NUM_SLICES + 1 full gc + however many were triggered naturally (due to
+ // whatever zealousness setting).
+ print("Found " + slicesFound + " slices");
+ equal(slicesFound >= NUM_SLICES + 1, true);
+
+ do_test_finished();
+ });
+}