276bc6ad2e
We can sometimes statically determine that a given load will unconditionally trap. When this happens, we emit an unconditional trap, and we need to stop adding new instructions to the block. This commit introduces a `Reachability<T>` type that is like `Option<T>` but specifically for communicating reachability and is marked `must_use` to receivers to handle transitions from reachable to unreachable states. Additionally, adds handling of reachable -> unreachable state transitions to some SIMD op translations that weren't checking for it. Fixes #5455 Fixes #5456
This crate performs the translation from a wasm module in binary format to the in-memory form of the Cranelift IR.
If you're looking for a complete WebAssembly implementation that uses this library, see Wasmtime.