23.0.0

Released 2024-07-22.

Added

• Support for DWARF debugging information with native debuggers is now
  implemented for components.
  #8693

• CLIF frontends can now define their own stack maps.
  #8728
  #8876

• Wasmtime now supports the custom-page-sizes proposal.
  #8763

• This project now publishes a crate named
  wasi-preview1-component-adapter-provider which provides the WASIp1 adapters
  as constants in Rust code.
  #8874

Changed

• Call hooks now have access to the full StoreContextMut<T>.
  #8791

• Call hooks have been moved behind an off-by-default compile-time Cargo feature
  named call-hook.
  #8795
  #8808

• Wasmtime's minimum supported Rust version is now 1.77.0.
  #8796

• Resumable traps have been removed from Cranelift.
  #8809

• Traps are not GC safepoints any more in Cranelift.
  #8810

• Support for Intel memory protection keys is now disabled by default at compile
  time and is gated behind a Cargo feature.
  #8813

• Exports from components have been refactored and redesigned to support
  skipping name lookups at runtime where possible.
  #8786

• Wasmtime's lookup of versioned component exports now takes semver into
  account in the same manner as imports.
  #8830

• Wasmtime's guest profiler will now take samples at hostcall boundaries.
  #8802

• Wasmtime's pooling allocator now by default allows 32-bit linear memories to
  grow to their full size of 4G.
  #8849

• The size of WASI adapter binaries has been optimized.
  #8858
  #8859

• The wasmtime-wasi-http crate has been refactored to better match the
  wasmtime-wasi crate.
  #8861

• Support for caching call_indirect sites has been removed.
  #8881

• Wasmtime's x86_64 binary releases are now based on AlmaLinux 8 instead of
  CentOS 7.
  #8892

Fixed

• An issue with generated .debug_loc sections for native debuggers has been
  fixed.
  #8753

• Wasmtime's no_std build for riscv64 has been fixed.
  #8770

• A bug related to lost Waker instances with async stdio streams has been
  fixed.
  #8782

• Configuration of trappable_error_type has been improved in Wasmtime's
  bindgen! macro.
  #8833

• Prints to stdout/stderr without a newline now work better with wasmtime serve.
  #8877

• An issue with br_if and stack-related state has been fixed in Winch.
  #8886

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

21.0.1

Released 2024-05-22.

Fixed

• Fixed outgoing HTTP requests which don't explicitly specify a port.
  #8671

21.0.0

Released 2024-05-20.

Added

• The wasmtime explore subcommand now supports *.wat files.
  #8314

• Wasmtime now supports DWARF Fission *.dwp files.
  #8055

• The wasmtime crate now supports #![no_std], and more information about
  this transition can be found in
  #8341.
  #8463
  #8483
  #8485
  #8528
  #8533

• A Config knob is now available for one-entry call_indirect caching to
  speed up modules with lots of call_indirect instructions.
  #8509

• Cranelift's riscv64 backend has initial support for the Zfa Extension.
  #8536

• The WebAssembly tail-calls proposal is now enabled by default when using the
  Cranelift backend, except for the s390x architecture.
  #8540

Changed

• Support for NaN canonicalization on x64 has been optimized to avoid branches.
  #8313

• The bindgen! macro now defaults to assuming imports cannot trap, but this
  behavior is configurable at macro-generation time.
  #8310

• The fd_{read,write} implementations in wasmtime-wasi have been optimized.
  #8303

• The wasmtime-wasi-http crate has been refactored and has improved
  documentation.
  #8332
  #8347

• Unused with parameters in bindgen! now generate an error.
  #8371

• The fd_read implementation in wasmtime-wasi now only reads into a single
  iovec per call.
  #8415

• The wasmtime_val_t type in the C API no longer holds any allocations. This
  type must still be manually managed to properly unroot values, however.
  #8451

• Add an optimized "sleep" path for poll_oneoff to wasmtime-wasi.
  #8429

• The Wasmtime-internal wasmtime-runtime crate has been removed.
  #8501

• The pooling allocator now allows twice as many elements as before.
  #8527

• Using CMake to build the C API has been improved along a number of axes.
  #8490
  #8497
  #8549

Fixed

• Pooling allocator CLI options are now respected with the wasmtime serve
  subcommand.
  #8525

• The read implementation for file input streams in wasmtime-wasi now
  correctly handles zero-length reads.
  #8611

20.0.2

Released 2024-05-07.

Added

• Improve error in CMake for when Cargo is not found.
  #8497

• Use --release in CMake with MinSizeRel and RelWithDebInfo.
  #8549

• Add a WASMTIME_FASTEST_RUNTIME configuration option for CMake which enables
  LTO and other related optimization options.
  #8554

20.0.1

Released 2024-05-03.

Added

• Make the c-api CMakeLists.txt easier to import.
  #8496

20.0.0

Released 2024-04-22.

Added

• Support for shared WebAssembly memories has been added to the C API.
  #7940

• A Component::component_type method has been added to reflect on the imports
  and exports of a component.
  #8078

• The with key in bindgen! now supports remapping entire packages and
  namespaces.
  #8083

• Winch now supports the component model by using Cranelift to generate
  trampolines.
  #8082
  #8109

• The WASI-NN backend now supports ONNX.
  #7691

• The wasmtime CLI now has an -S inherit-env flag for inheriting the entire
  process environment.
  #8168

• Winch now supports the WebAssembly memory64 proposal.
  #8194

• Embedders can now opt-in to allowing wasmtime-wasi to block the current thread
  with file operations, for example.
  #8190

• A wasmtime::CodeBuilder type has been added to refine the configuration of
  compiling a Module or a Component.
  #8181

• The wasmtime serve subcommand now enables configuring preopened directories
  and environment variables.
  #8279

Changed

• Support for WebAssembly GC is in the process of being implemented which has
  required refactoring and reimplementing the existing gc support for
  externref. Many APIs in this area has changed, see linked PRs for more
  details. Note that the wasm_* parts of the C API no longer support
  externref.
  #8011
  #8196

• The wasmtime::component::Val type no longer stores type information and
  instead must be interpreted in the context of a type.
  #8062

• The arguments required for ResourceAny::try_from_resource have been
  simplified by refactoring the internal representation.
  #8061

• The arguments required for wasmtime::component::Linker::func_new have been
  simplified by refactoring the internal representation.
  #8070

• The pooling allocator is now enabled by default with wasmtime serve.
  #8073

• The error message for missing imports in has been improved with components.
  #7645

• Wasmtime's MSRV is now 1.75.0.
  #8205

• Wasmtime's translation of table-related instructions has improved codegen in
  some common cases, especially with call_indirect.
  #8063
  #8125
  #8124
  #8134
  #8137
  #8162
  #8159
  #8172
  #8171
  #8139
  #8206

• Book-based documentation has been reordered and refactored.
  #8130

• The -S common flag is renamed to -S cli, to better reflect that it provides
  the wasi-cli APIs. -S common is still accepted for now, and will be deprecated
  in the future.
  #8166

• The tail-call calling convention now supports callee-saved registers to
  improve performance and allow enabling this WebAssembly proposal by default in
  the future.
  #8246

• The wasmtime-wasi crate has been refactored to restructure some items and
  documentation has been added for most items.
  #8228

• Support for the WebAssembly threads proposal is now gated by an
  on-by-default Cargo feature named threads.
  #8260

• Borrow-checking in wiggle has been optimized to not be as fine-grained any
  more. This is a breaking change if users are relying on the ability to safely
  mutably borrow disjoint regions of memory.
  #8277

Fixed

• Connection timeouts with wasi-http have been fixed.
  #8085

• Generating bindings with bindgen! now works correctly when some WIT types
  are not used.
  #8065

• Errors in wasi-http are no longer accidentally returned as traps.
  #8272

• C API bindings now depend on wasmtime-wasi instead of wasi-common, and the
  wasi_config_preopen_socket function is no longer available as a result.
  #8066

19.0.2

Released 2024-04-11.

• Fix a panic when compiling invalid components.
  #8322

• Fix bindgen! with trappable_error_type using unversioned/versioned
  packages.
  #8305

• cranelift: Include clobbers and outgoing args in stack limit.
  #8334

18.0.4

Released 2024-04-11

Fixed

• Fix bindgen! with trappable_error_type using unversioned/versioned
  packages.
  #8305

• cranelift: Include clobbers and outgoing args in stack limit.
  #8334

• Fix a panic when compiling invalid components.
  #8322

17.0.3

Released 2024-04-11

Fixed

• cranelift: Include clobbers and outgoing args in stack limit.
  #8334