v33.0.0: Release Wasmtime 33.0.0 (#10812)

33.0.0

Released 2025-05-20.

Added

• Cranelift now has initial support for try_call and try_call_indirect
  instructions, to be used in the future for the WebAssembly exception-handling
  proposal. Wasmtime does not yet implement this proposal yet.
  #10510
  #10557
  #10593

• Cranelift can now optimize some simple possibly-side-effectful instructions,
  such as division.
  #10524

• Wasmtime now supports --invoke for components using the WAVE format.
  #10054

• Initial support for the Component Model has landed in Wasmtime's C API. Note
  that the API is not yet feature-complete, however.
  #10566
  #10598
  #10651
  #10675

• Wasmtime's C++ API is now available from this repository and the
  bytecodealliance/wasmtime-cpp repository has been archived. Additionally the
  monolithic wasmtime.hh header file has been split into separate header
  files.
  #10582
  #10600

• Wasmtime's cookbook-style documentation has been expanded.
  #10630

• Wasmtime's now supports custom yield behavior when using epoch interrupts.
  #10671

Changed

• Wasmtime's bindgen now type-checks export functions in the constructor of
  the generated {Worldname}Pre or {Worldname} structs, rather than at the
  call of the export function.
  #10610

• Wasmtime's component::Component and component::Instance now have consistient
  get_export and get_export_index methods, which return (ComponentItem, ComponentExportIndex) and ComponentExportIndex, respectively.
  #10597

• On failure, wasmtime serve gives an internal server error response, rather
  than closing the connection.
  #10645

• Cranelift's single-pass allocator has been disabled due to being unable to
  support internal refactorings in preparation for the WebAssembly exceptions
  proposal. Re-enabling this allocator is tracked at
  regalloc2#217 for
  those interested.
  #10554

• Wasmtime's {Array,Extern,Struct}Ref functions will now automatically trigger
  a GC.
  #10560

• Wasmtime's GC heaps now use the same translation techniques as linear memories
  meaning they have far fewer bounds-checks than before.
  #10503

• Wasmtime's implementation of WASIp2 has moved to wasmtime_wasi::p2 from the
  root of the crate.
  #10073

• Wasmtime will no longer emit calls to Cranelift-defined "libcalls" and instead
  everything goes through Wasmtime's libcall mechanism instead, paving the way
  for a future change for more efficient stack limit checking in wasm. This can
  also improve deserialize-from-disk times and improve page cache usage for
  modules that use libcalls as relocations are no longer necessary.
  #10657

• Configuration of caching can now be done through an API instead of exclusively
  through a configuration file. Additionally cache-related APIs in Config have
  changed.
  #10665

• Resources in the Component Model are now stored in a single table per-instance
  instead of per-type tables. Guests will see a different pattern of index
  allocation but this is not expected to cause any issues at runtime.
  #10701

Fixed

• Some math intrinsics have been fixed when compiled by Rust 1.87+.
  #10534

• Component model libcalls correctly handle platform-specific argument extension
  in ABIs.
  #10540

• An off-by-one issue with DWARF debuginfo has been fixed.
  #10570

• The Config::target method is no longer gated by a #[cfg] for an enabled
  compiler, it can be used when only the runtime feature is available.
  #10618

• An issue with "simulated" DWARF has been fixed.
  #10681

• C/C++ headers are now tested that they can be included in isolation, and a
  number of issues have been fixed.
  #10694