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LibJS+LibGC: Run FinalizationRegistry cleanup host hook *after* GC

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Before this change, it was possible for a second GC to get triggered
in the middle of a first GC, due to allocations happening in the
FinalizationRegistry cleanup host hook. To avoid this causing problems,
we add a "post-GC task" mechanism and use that to invoke the host hook
once all other GC activity is finished, and we've unset the "collecting
garbage" flag.

Note that the test included here only fails reliably when running with
the -g flag (collect garbage after each allocation).

Fixes #3051
This commit is contained in:
Andreas Kling
2025-01-23 09:59:22 +01:00
committed by Andreas Kling
parent b7a554d1f2
commit 51a91771b8
4 changed files with 55 additions and 15 deletions
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9
Libraries/LibJS/Runtime/FinalizationRegistry.cpp
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@@ -57,8 +57,13 @@ void FinalizationRegistry::remove_dead_cells(Badge<GC::Heap>)
any_cells_were_removed = true;
break;
}
if (any_cells_were_removed)
vm().host_enqueue_finalization_registry_cleanup_job(*this);
if (any_cells_were_removed) {
// NOTE: We make a GC::Root here to ensure that the FinalizationRegistry stays alive
// even if a subsequent GC is triggered before the callback has a chance to run.
heap().enqueue_post_gc_task([that = GC::make_root(this)]() {
that->vm().host_enqueue_finalization_registry_cleanup_job(*that);
});
}
}
// 9.13 CleanupFinalizationRegistry ( finalizationRegistry ), https://tc39.es/ecma262/#sec-cleanup-finalization-registry