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/* Any copyright is dedicated to the Public Domain.
http://creativecommons.org/publicdomain/zero/1.0/ */
const { getSingleton, getJsRefcount } = ChromeUtils.importESModule(
"resource://gre/modules/RustRefcounts.sys.mjs"
);
// Test refcounts when we call methods.
//
// Each method call requires that we clone the Arc pointer on the JS side, then pass it to Rust
// which will consumer the reference. Make sure we get this right
function createObjectAndCallMethods() {
const obj = getSingleton();
obj.method();
}
add_test(() => {
// Create an object that we'll keep around. If the ref count ends up being low, we don't want
// to reduce it below 0, since the Rust code may catch that and clamp it
const obj = getSingleton();
createObjectAndCallMethods();
Cu.forceGC();
Cu.forceCC();
do_test_pending();
do_timeout(500, () => {
Assert.equal(getJsRefcount(), 1);
// Use `obj` to avoid unused warnings and try to ensure that JS doesn't destroy it early
obj.method();
do_test_finished();
run_next_test();
});
});
// Test refcounts when creating/destroying objects
function createAndDeleteObjects() {
[getSingleton(), getSingleton(), getSingleton()];
}
add_test(() => {
const obj = getSingleton();
createAndDeleteObjects();
Cu.forceGC();
Cu.forceCC();
do_timeout(500, () => {
Assert.equal(getJsRefcount(), 1);
obj.method();
do_test_finished();
run_next_test();
});
});
// As we implement more UniFFI features we should probably add refcount tests for it.
// Some features that should probably have tests:
// - Async methods
// - UniFFI builtin trait methods like 'to_string'
// - Rust trait objects
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