c-api: Tidy up some wasmtime_func_t usage
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Try to avoid using a `transmute` in the implementation of the C API and instead use a `union` like is being done in bytecodealliance#8451. Additionally add some helper functions to the header to work with null funcref values instead of only documenting the implementation.
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This includes updates for: - bytecodealliance/wasmtime#8451 - bytecodealliance/wasmtime#8461 - bytecodealliance/wasmtime#8011 TODOs: - Allocating an `externref` can now fail (by `wasmtime_externref_new` returning `false`). Currently, we throw a `WasmtimeException` in that case. We need to check where that exception can be thrown, and whether we need to do any additional clean-up (e.g. when converting arguments for a function call). - Check whether it's ok to compare the `__private` field of externs (which has been remaned in the C API, previously it was `index`). - `anyref` type is not yet supported, but I'm not sure what exactly it is and whether we need to add it. Fixes bytecodealliance#315
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* Update to recent Wasmtime C API changes regarding values. This includes updates for: - bytecodealliance/wasmtime#8451 - bytecodealliance/wasmtime#8461 - bytecodealliance/wasmtime#8011 TODOs: - Allocating an `externref` can now fail (by `wasmtime_externref_new` returning `false`). Currently, we throw a `WasmtimeException` in that case. We need to check where that exception can be thrown, and whether we need to do any additional clean-up (e.g. when converting arguments for a function call). - Check whether it's ok to compare the `__private` field of externs (which has been remaned in the C API, previously it was `index`). - `anyref` type is not yet supported, but I'm not sure what exactly it is and whether we need to add it. Fixes #315 * Follow-Up: Make fields private. * Ensure to clean-up `Value` instances (in arguments for a function call, and in results for an untyped callback) when e.g. allocating an `externref` fails. We don't need to do such a clean-up for unchecked function calls that use `ValueRaw` because in that case we don't own `externref` values. * Avoid accessing the `__private` fields in tests by checking the whole struct for equality (which is the case when all members are equal). * Use separate dictionaries for caching `Function`, `Memory`, and `Global` objects in the `Store`, which avoids having to explicitly accessing the `__private` field (because the whole struct is now compared). Additionally, it is more type-safe (since we don't need to cast the `object`).
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Try to avoid using a
transmutein the implementation of the C API and instead use aunionlike is being done in #8451. Additionally add some helper functions to the header to work with null funcref values instead of only documenting the implementation.