[20.0.0] c-api: Create RootScope where necessary
#8375
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* c-api: Create `RootScope` where necessary
This commit changes the `wasmtime_val_t::{from_val, to_val}` methods to
take a `RootScope` instead of any `AsContextMut`. This then required a
number of refactorings in callers to ensure that a `RootScope` was
created for any function that needed one. This is required to ensure
that GC references in the C API aren't forced to live for the entire
lifetime of the store.
This additionally added `*_unrooted` variants which do the same thing
but don't require `RootScope`. This was needed for when the C API calls
out to the embedder through a function call because a new `RootScope`
wouldn't work for return values (they're bound to a scope within the
closure when we want them to outlive the closure). In these situations
though we know a `RootScope` is already present at the entrypoint.
Closes bytecodealliance#8367
* Review comments
|
For testing this I've double-checked that with the release-20.0.0 branch and this patch the wasmtime-py test suite is passing (with appropriate changes there too) along with the wasmtime-cpp test suite. |
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fitzgen
approved these changes
Apr 15, 2024
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Backport of #8374