bytecodealliance/wasmtime v29.0.0

on GitHub

29.0.0

Released 2025-01-20.

Added

• Winch now supports epoch-based interruption.
  #9737

• Pulley, Wasmtime's WebAssembly interpreter, has seen quite a lot of progress
  and support fleshed out. It's still not 100% complete but should be about
  ready to start kicking the tires.
  #9744

• The Wasmtime CLI now supports a -Wextended-const flag to control whether the
  extended-const wasm proposal is enabled or not.
  #9768

• Work continues to progress on the AArch64 Winch backend, bringing it closer to
  completion.
  #9762
  #9767
  #9751
  #9784
  #9781
  #9792
  #9787
  #9798
  #9850

• Wasmtime now supports a "custom code publisher" which can be useful when
  Wasmtime doesn't have built-in support for a particular environment.
  #9778

• Configuration options have been added for wasmtime-wasi-http outgoing
  bodies.
  #9800

• Log prefixes can now be disabled for the wasmtime serve command.
  #9821

• A new WASMTIME_LOG_NO_CONTEXT environment variable was added to live
  alongside WASMTIME_LOG.
  #9902

• Release artifacts for aarch64-musl targets are now available.
  #9934

Changed

• Wasmtime libcalls now return whether a trap happened rather than raising a
  trap directly to better prepare for the Pulley interpreter and an eventual
  implementation of Wasm exception-handling.
  #9710

• Wasmtime will now use the Pulley interpreter by default on platforms that
  are not supported by Cranelift.
  #9741

• Demangling symbols in profiling and debugging has improved to handle failures
  to demangle C++ symbols.
  #9756

• WASI WIT files have been updated to 0.2.3.
  #9807

• Wasmtime's bindgen! macro in async mode no longer uses #[async_trait]
  an instead natively uses async fn in traits.
  #9867

• Floats are no longer canonicalized flowing into or out of components.
  #9879

• Instance methods are now translated to static methods in DWARF translation.
  #9898

• The C API now supports debug builtins for debugging guest code.
  #9915

Fixed

• The header file for wasmtime_instance_pre_instantiate in the C API has been
  fixed.
  #9770

• WebAssembly DWARF is more conservative in its GC pass during translation to
  native DWARF.
  #9829

• Debugging intrinsics are fixed on Linux to be exported now.
  #9866