348c597a8e
* Remove global state for trap registration There's a number of changes brought about in this commit, motivated by a few things. One motivation was to remove an instance of using `lazy_static!` in an effort to remove global state and encapsulate it wherever possible. A second motivation came when investigating a slowly-compiling wasm module (a bit too slowly) where a good chunk of time was spent in managing trap registrations. The specific change made here is that `TrapRegistry` is now stored inside of a `Compiler` instead of inside a global. Additionally traps are "bulk registered" for a module rather than one-by-one. This form of bulk-registration allows optimizing the locks used here, where a lock is only held for a module at-a-time instead of once-per-function. With these changes the "unregister" logic has also been tweaked a bit here and there to continue to work. As a nice side effect the `Compiler` type now has one fewer field that requires actual mutability and has been updated for multi-threaded compilation, nudging us closer to a world where we can support multi-threaded compilation. Yay! In terms of performance improvements, a local wasm test file that previously took 3 seconds to compile is now 10% faster to compile, taking ~2.7 seconds now. * Perform trap resolution after unwinding This avoids taking locks in signal handlers which feels a bit iffy... * Remove `TrapRegistration::dummy()` Avoid an case where you're trying to lookup trap information from a dummy module for something that happened in a different module. * Tweak some comments
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!