97ff297683
* Remove another thread local in `instance.rs` This commit removes another usage of `thread_local!` in the continued effort to centralize all thread-local state per-call (or basically state needed for traps) in one location. This removal is targeted at the support for custom signal handlers on instances, removing the previous stack of instances with instead a linked list of instances. The `with_signals_on` method is no longer necessary (since it was always called anyway) and is inferred from the first `vmctx` argument of the entrypoints into wasm. These functions establish a linked list of instances on the stack, if needed, to handle signals when they happen. This involved some refactoring where some C++ glue was moved into Rust, so now Rust handles a bit more of the signal handling logic. * Update some inline docs about `HandleTrap`
Wasmtime Embedding API
The wasmtime crate is an embedding API of the wasmtime WebAssembly runtime.
This is intended to be used in Rust projects and provides a high-level API of
working with WebAssembly modules.
If you're interested in embedding wasmtime in other languages, you may wish to
take a look a the C embedding API instead!