Before, we would do a `heap_addr` to translate the given Wasm memory address into a native memory address and pass it into the libcall that implemented the atomic operation, which would then treat the address as a Wasm memory address and pass it to `validate_atomic_addr` to be bounds checked a second time. This is a bit nonsensical, as we are validating a native memory address as if it were a Wasm memory address. Now, we no longer do a `heap_addr` to translate the Wasm memory address to a native memory address. Instead, we pass the Wasm memory address to the libcall, and the libcall is responsible for doing the bounds check (by calling `validate_atomic_addr` with the correct type of memory address now).
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.