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/**
* Does a best-effort attempt at invoking garbage collection. Attempts to use
* the standardized `TestUtils.gc()` function, but falls back to other
* environment-specific nonstandard functions, with a final result of just
* creating a lot of garbage (in which case you will get a console warning).
*
* This should generally only be used to attempt to trigger bugs and crashes
* inside tests, i.e. cases where if garbage collection happened, then this
* should not trigger some misbehavior. You cannot rely on garbage collection
* successfully trigger, or that any particular unreachable object will be
* collected.
*
* @returns {Promise<undefined>} A promise you should await to ensure garbage
* collection has had a chance to complete.
*/
self.garbageCollect = async () => {
// https://testutils.spec.whatwg.org/#the-testutils-namespace
if (self.TestUtils?.gc) {
return TestUtils.gc();
}
// Use --expose_gc for V8 (and Node.js)
// to pass this flag at chrome launch use: --js-flags="--expose-gc"
// Exposed in SpiderMonkey shell as well
if (self.gc) {
return self.gc();
}
// Present in some WebKit development environments
if (self.GCController) {
return GCController.collect();
}
console.warn(
'Tests are running without the ability to do manual garbage collection. ' +
'They will still work, but coverage will be suboptimal.');
for (var i = 0; i < 1000; i++) {
gcRec(10);
}
function gcRec(n) {
if (n < 1) {
return {};
}
let temp = { i: "ab" + i + i / 100000 };
temp += "foo";
gcRec(n - 1);
}
};
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