Download Wasmtime 9.0.0

Added
- Initial integration of the Winch baseline compiler into Wasmtime is implemented. Note that Winch still does not support much of WebAssembly, but intrepid explorers may have an easier time playing around with it now. #6119
- The wasmtime CLI now has flags to limit memory, instances, and tables. For example --max-memory-size or --max-tables. Additionally it has a new --trap-on-grow-failure option to force a trap whenever a memory.grow would otherwise fail which can be useful for debugging modules which may be encountering OOM. #6149
- An initial implementation of the wasi-http proposal was added to Wasmtime in the shape of a new wasmtime-wasi-http crate and a --wasi-modules=experimental-wasi-http CLI flag. Note that this is not on-by-default and still in an experimental status at this time. #5929
- Wasmtime's bindgen! macro for components now has interfaces and with options to configure use of interfaces defined externally in separate crates. #6160 #6210
- Wasmtime's bindgen! macro emits trace events for arguments and results when enabled. #6209
- A new Engine::precompile_compatibility_hash method has been added to assist with hashing artifacts to be compatible with versions of Wasmtime. #5826
- Wasmtime's C API now has functions for enabling the WebAssembly relaxed-simd proposal. #6292
- A new --emit-clif flag has been added to wasmtime compile to see the CLIF corresponding to a WebAssembly module to be used for debugging. #6307
- Support for an in-process sampling-based profiler has been added to Wasmtime. This is intended to be used in conjunction with epochs to enable relatively simple implementations of profiling a guest module. #6282

Changed
- Overhauled the way that Wasmtime calls into Wasm and Wasm calls back out to the host. Instead of chaining together trampolines to convert between calling conventions, we now represent funcrefs with multiple function pointers, one per calling convention. This paves the way for supporting Wasm tail calls and also results in ~10% speed ups to a variety of function call benchmarks, however there are some slight compiled Wasm module code size regressions (which can be alleviated by disabling optional .eh_frame generation). Additionally, in the C API the wasmtime_func_call_unchecked function gained one more parameter, which is the capacity of the args-and-results buffer. #6262
- The wasmtime compile command will now default to producing executables for the native host and its CPU features instead of the baseline feature set of the host's architecture. #6152
- The ResourceLimiter trait and its async equivalent now support returning errors from growth to force a trap in the wasm module rather than reporting -1 to the wasm module. Note that this is primarily intended for debugging. #6149
- The non-egraph-based optimization pipeline has been removed from Cranelift, and the corresponding Config::use_egraphs option is also removed. #6167
- Generated types for WIT files now always generates owned types by default. #6189
- Wasmtime's baseline x86_64 CPU features required for SIMD support has been lowered from SSE 4.2 to SSE 4.1. #6206
- The fd_allocate implementation in Wasmtime will now always fail with ENOTSUP. #6217
- The "rights" system in WASI has been removed and rights are no longer inspected in the implementation of any WASI functions. #6265

Fixed
- WASI can now open directories without O_DIRECTORY. #6163
- The poll_oneoff function has been fixed when handling non-regular files. #6258
- The behavior of path_readlink on too-small buffers has been fixed to truncate. #6225

Cranelift changes
Note: this section documents changes to Cranelift, a code generator backend that Wasmtime uses. These changes are not always applicable to Wasmtime as a WebAssembly runtime but may be interesting to other projects which embed or use Cranelift.
- New {u,s}{add,sub,mul}_overflow instructions have been added. #5784
- The iadd_cout and isub_bout instructions have been removed. #6198
- ISLE now supports binary and octal integer literals. #6234
- An implementation of SIMD for RISC-V has started. #6240 #6266 #6268