Stream: git-wasmtime

Topic: wasmtime / issue #13862 Investigate moving `StoreGcData` ...

Wasmtime GitHub notifications bot (Jul 10 2026 at 20:16):

alexcrichton opened issue #13862:

Spawned from this comment, this is something we may want to push more on in the future. In an initial attempt to do this I was stymied pretty quickly:

• gc_host_alloc_types would be difficult to move because this field is currently accessed before a GcStore is allocated. Callers would have to switch to ensure_gc_store and async to make this work.
• pending_exception is difficult because right now barriers require the entire GcStore, so the preexisting barrier functions can't be used if this field is stored witin the GcStore itself.
• gc_roots is difficult because during timming liveness flags for OwnedRooted that takes a simultaneous borrow on GcStore and the RootSet. If these lived in the same object it's more difficult to handle them in tandem.

However gc_roots_list and subtype_check_cache are likely easy to move. Given the difficulty in moving the prior ones though I didn't want to do a halfway migration so I'm going to leave this for a future refactoring.

Wasmtime GitHub notifications bot (Jul 10 2026 at 20:16):

alexcrichton added the wasm-proposal:gc label to Issue #13862.

Last updated: Jul 29 2026 at 05:03 UTC