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RELEASES.md

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22.0.1

Released 2024-10-09.

Fixed

  • Fix a runtime crash when combining tail-calls with host imports that capture a stack trace or trap. GHSA-q8hx-mm92-4wvg

  • Fix a race condition could lead to WebAssembly control-flow integrity and type safety violations. GHSA-7qmx-3fpx-r45m

22.0.0

Released 2024-06-20.

Added

  • The CMake-based build of Wasmtime's C API now adds a WASMTIME_FASTEST_RUNTIME option which activates the "fastest-runtime" compilation profile which enables LTO. #8554

  • Cranelift supports more instructions in the RISC-V Zfa and ZiCond extensions. #8582 #8695

  • Support for fused-multiply-and-add on RISC-V has been improved. #8596 #8588

  • Release binaries for {aarch64,x86_64}-android have been added. Note that Android is still a Tier 3 target. #8601

  • Wasmtime now supports supertypes and finality in the type hierarchy for wasm gc. #8595

  • Lazy initialization of tables can now be tuned with a CLI flags and configuration option. #8531

  • Wasmtime now compiles for x86_64 OpenBSD. Note that this is a Tier 3 target and continued support is always appreciated. #8613

  • Stack slots in Cranelift can now specify custom alignment. #8635

  • Wasm function names are now used in compiled objects to assist with debugging and introspection with native tools. #8627

  • Wasmtime's release artifacts now includes wasmtime-platform.h for use with no_std targets. #8644

  • Release binaries for x86_64 Alpine Linux have been added. #8668

  • A new Component::define_unknown_imports_as_traps function has been added to stub out functions in a component linker. #8672

Changed

  • Wasmtime and Cranelift's now require Rust 1.76.0 to build. #8560

  • The wasi_config_preopen_dir function no longer always returns true in the C API. Additionally wasi_config_set_env and wasi_config_set_argv may now return an error. #8572

  • Cranelift now updates registers of backend instructions in-place, simplifying register allocation and assignment. #8566 #8581 #8592 #8604 #8605

  • Wasmtime now attempts to batch memory decommits into one tight loop. #8581 #8590

  • Bindings generated with bindgen! now have generated GetHost traits and add_to_linker_get_host functions which enable a more general means by which to acquire host implementations from a store's T. #8448

  • The wasmtime serve subcommand will now dynamically determine whether to use the pooling allocator by default based on the system's available virtual memory. #8610

  • Implementations of Host traits in the wasmtime-wasi crate are now for WasiImpl<T> instead of blanket impls for T. #8609 #8766

  • The concepts of "virtual sp offset" and "nominal sp" have been removed from all Cranelift backends. #8631 #8643

  • The maximum size of linear memory in the pooling allocator is now specified in bytes instead of pages. #8628

  • Wasmtime no longer has two different host ABIs for host functions and instead only has one. The "array" calling convention is now unconditionally used instead of having a split between the "native" calling convention and the "array" calling convention. This means that Func::new is now available even when the cranelift feature is disabled. #8629 #8646

  • Wasmtime's C API bindings for CMake have been refactored and now supports specifying Cargo features directly. Functions that are configured out are now also gated in header files. #8642

  • Wasmtime's C API can now be built without Cranelift or Winch. #8661

  • Wasmtime's release binaries have Winch compiled in by default now. #8660

  • The output of wasmtime explore now shows function names in addition to indices. #8639

  • Support for the Wasmtime 13-and-prior CLI has been removed. #8597

  • Wiggle-based borrow checking has been removed in favor of modeling host usage of guest memory with Rust-level borrows. #8702

  • Wasmtime's bindgen! macro will now generate the same hierarchy of traits/types/modules even when the with module is used via new pub use statements. #8721

  • The WasiCtxBuilder::socket_addr_check function now takes an async closure. #8715

  • The Func::wrapN_async functions and friends have all been consolidated into a single function with a slightly different signature of taking a tuple of arguments rather than "splatted" arguments. #8732

Fixed

  • Trampoline lookup for wasm gc functions that may use subtyping on the host to match a guest's desired type now no longer panics. #8579

  • The total size of arguments, environment variables, and preopens is now allowed to exceed 64k when using the wasip1 component adapter. #8594

  • Performing a zero-length read on file streams is now fixed in WASI. #8611

  • Tail calls are now turned by default after a mistake was discovered in the previous releases's intent to enable them by default. #8682

  • Winch support for f64 comparison instructions has been fixed. #8685

  • The SO_REUSEADDR option is reenabled for Unix platforms with wasmtime serve. #8738

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