Winch now has initial experimental support for the WebAssembly exception-handling proposal. #14066 #14081 #14132 #14149 #14180 #14209
Wasmtime's type reflection APIs for WebAssembly GC types now have dedicated enums for Heap{Top,Bottom}Types. #14208
Wasmtime now supports the use of environment variables to configure most CLI arguments in addition to the preexisting CLI flags. #14217
Cranelift will now fold u{add,mul}_overflow results combined with brif instructions for more optimal codegen. #14217 #14254
Components can be tested for equality with a new Component::same API. #14257
The Wasmtime C/C++ API now supports the component-model-implements feature. #14264
Cranelift will now emit the {u,s}bfm instructions on AArch64. #14187
Changed
The wide-arithmetic WebAssembly proposal is now enabled by default. #14110
Config::operator_cost now applies to operators inside constant expressions (global initializers, element and data segment offsets, element segment expressions) and to the synthesized call to a module's start function. Previously each of those was charged 1 fuel unit regardless of the configured cost. #14215
Wasmtime's WASI implementation will no longer over-read stdin where possible. #14077
Wasmtime's WASIp2 implementation now maps host-level "broken pipe" errors to StreamError::Closed. #14107
Wasmtime's WASIp2 implementation of wasi:http now validates ports in the same manner as wasip3. #14123
Wasmtime's WASI implementation of wasi:filesystem now returns the is-directory error in some situations when a file is provided. #14135
The wasmtime-wasi-http crate now has the p3 feature enabled by default. #14137
Wasmtime's WASIp2 implementation of wasi:http now runs more hooks from the WasiHttpHooks trait in the same manner as wasip3. #14167
Wasmtime now requires Rust 1.96.0 to compile. #14184
Adjustments have been made to the scheduling of threads w.r.t. trapping behavior for cooperatively threaded components. These changes are made to align with the upstream component-model specification. #14146 #14250
Fuel for bulk operations is now consumed after the bulk operation has completed instead of up-front, restoring previous behavior where a failed very large memory growth doesn't trap the original program. #14213
A number of future poll calls throughout the WASIp2 implementation now explicitly opt-out of Tokio's per-task cooperative budget to better uphold guarantees of WASIp2 APIs. #14265
The run_concurrent function is now allowed to run recursively for separate stores, but it still can only be used at most once recursively for any one store. #14302
The compile-time performance of the alias analysis in Cranelift has been greatly improved. #14306
