wasmtime-cli 45.0.0

Command-line interface for Wasmtime
Documentation 
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## 45.0.0

Released 2026-05-21.

### Added

* Winch now respects the `enable_nan_canonicalization` setting.
  [#12939](https://github.com/bytecodealliance/wasmtime/pull/12939)

* Initial support for invoking component functions asynchronously has been added
  to the C API.
  [#12973](https://github.com/bytecodealliance/wasmtime/pull/12973)

* Cranelift's s390x backend implements more instructions from z17 and also
  implements more CLIF arithmetic overflow instructions.
  [#12523](https://github.com/bytecodealliance/wasmtime/pull/12523)
  [#12707](https://github.com/bytecodealliance/wasmtime/pull/12707)

* Wasmtime's support for handling OOM in more APIs has expanded and is now
  documented as well.
  [#12993](https://github.com/bytecodealliance/wasmtime/pull/12993)
  [#12988](https://github.com/bytecodealliance/wasmtime/pull/12988)
  [#13017](https://github.com/bytecodealliance/wasmtime/pull/13017)
  [#13047](https://github.com/bytecodealliance/wasmtime/pull/13047)
  [#13049](https://github.com/bytecodealliance/wasmtime/pull/13049)
  [#13051](https://github.com/bytecodealliance/wasmtime/pull/13051)
  [#13074](https://github.com/bytecodealliance/wasmtime/pull/13074)
  [#13083](https://github.com/bytecodealliance/wasmtime/pull/13083)
  [#13088](https://github.com/bytecodealliance/wasmtime/pull/13088)
  [#13224](https://github.com/bytecodealliance/wasmtime/pull/13224)

* The `Component` type now offers reflection APIs over the compiled in-memory
  view of instructions in the same manner `Module` does.
  [#13073](https://github.com/bytecodealliance/wasmtime/pull/13073)

* The `wasmtime` CLI now has a `hot-blocks` subcommand to explore a
  `perf`-recorded output and show hot basic blocks of WebAssembly instructions.
  [#13077](https://github.com/bytecodealliance/wasmtime/pull/13077)

* Wasmtime now has an initial implementation of a copying collector for GC,
  which notably enables collecting cycles unlike the DRC collector.
  [#13093](https://github.com/bytecodealliance/wasmtime/pull/13093)
  [#13107](https://github.com/bytecodealliance/wasmtime/pull/13107)

* The WASI `inherit_network` and `allow_ip_name_lookup` options were added to
  the C API.
  [#13145](https://github.com/bytecodealliance/wasmtime/pull/13145)

* The C API now has the ability to select `Winch` as well as the
  `RegallocAlgorithm` in use.
  [#13155](https://github.com/bytecodealliance/wasmtime/pull/13155)

* The Wasmtime CLI now has a `-Dmax-backtrace=N` argument to control the number
  of frames captured.
  [#13218](https://github.com/bytecodealliance/wasmtime/pull/13218)

* Wasmtime now tracks whether there are any active async tasks within a store
  and provides an embedder API to learn when there are none left.
  [#13246](https://github.com/bytecodealliance/wasmtime/pull/13246)

* Cranelift now has an idempotent-store elimination pass.
  [#13251](https://github.com/bytecodealliance/wasmtime/pull/13251)

### Changed

* Wasmtime's DRC collector has received some optimizations to get some wins on
  local benchmarking.
  [#12969](https://github.com/bytecodealliance/wasmtime/pull/12969)
  [#12974](https://github.com/bytecodealliance/wasmtime/pull/12974)

* Wasmtime's C API can now be built without the `gc` crate feature of Wasmtime.
  [#12805](https://github.com/bytecodealliance/wasmtime/pull/12805)

* Wasmtime now has an implemented and improved grow-vs-collect heuristic to
  improve behavior of GC-using programs.
  [#12942](https://github.com/bytecodealliance/wasmtime/pull/12942)

* Cranelift on aarch64 now uses a more optimized frame layout for tail-call-only
  functions.
  [#11608](https://github.com/bytecodealliance/wasmtime/pull/11608)

* Wasmtime now supports a separate set of GC tunables different from the main
  set of tunables for linear memory to enable configuring it separately.
  [#13080](https://github.com/bytecodealliance/wasmtime/pull/13080)

* Wasmtime no longer uses pointer authentication instructions for the
  implementation of fibers due to issues on Android.
  [#13118](https://github.com/bytecodealliance/wasmtime/pull/13118)

* Wasmtime now requires Rust 1.93.0 to compile.
  [#13127](https://github.com/bytecodealliance/wasmtime/pull/13127)

* The behavior of using Wasmtime as a CMake subproject has been improved.
  [#13157](https://github.com/bytecodealliance/wasmtime/pull/13157)

* Reference types in the C/C++ API have been refactored and reorganized.
  [#13154](https://github.com/bytecodealliance/wasmtime/pull/13154)
  [#13235](https://github.com/bytecodealliance/wasmtime/pull/13235)

* The Wasmtime CLI now warns about usage of wasi-common or wasi-threads as these
  components are slated for removal in Wasmtime 47.0.0. For more information see
  [the associated RFC].
  [#13264](https://github.com/bytecodealliance/wasmtime/pull/13264)

[the associated RFC]: https://github.com/bytecodealliance/rfcs/pull/47

* Inlining in Wasmtime now has a different set of configuration options, notably
  more values are packed into `-Cinlining=...`.
  [#13250](https://github.com/bytecodealliance/wasmtime/pull/13250)

### Fixed

* The WASIp1-to-WASIp2 adapter now handles nonblocking I/O in `fd_{read,write}`
  more appropriately.
  [#13111](https://github.com/bytecodealliance/wasmtime/pull/13111)

* The `Host` header is injected less often for wasmtime-wasi-http.
  [#13138](https://github.com/bytecodealliance/wasmtime/pull/13138)

* Downcasts of `funcref` values now uses the correct type for imported
  functions.
  [#13161](https://github.com/bytecodealliance/wasmtime/pull/13161)

* The DRC allocator's memory usage during tracing has been reduced when there
  are large arrays.
  [#13192](https://github.com/bytecodealliance/wasmtime/pull/13192)

* The performance of reading stdin in WASI has been improved.
  [#13256](https://github.com/bytecodealliance/wasmtime/pull/13256)

* WASI path_open(TRUNCATE) bypasses `FilePerms::WRITE` host restriction.
  [GHSA-2r75-cxrj-cmph](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-2r75-cxrj-cmph)


--------------------------------------------------------------------------------

Release notes for previous releases of Wasmtime can be found on the respective
release branches of the Wasmtime repository.

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