A fast and secure runtime for WebAssembly
Released 2024-04-22.
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
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
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
Released 2024-04-11
Released 2024-03-20.
C API bindings for the sampling-based profiler in Wasmtime have been added. #7854
Add the WasiP1Ctx to ease the use of wasmtime-wasi in place of wasi-common
#8053
The Winch compiler backend is now feature-complete for x64. Note that minor issues and fuzz bugs are still being addressed, but now's a good time to test if you're interested. #7894 #7909 #7927 #7932 #7949 #7974 #8001
The typed function references proposal to WebAssembly is now fully implemented. #7943
The component::Linker type is now "semver aware" in that it enables loading
components referring to past or future versions of interfaces so long as the
types are compatible.
#7994
Wasmtime can now be built for "custom platforms" which is intended for bare-metal builds. #7995
The wasmtime-wasi-nn crate now has a backend based on WinML.
#7807
The wasmtime CLI now has flags for configuring limits of the pooling
allocator.
#8027
The wasmtime serve command no longer binds its port with SO_REUSEADDR
meaning that if it is invoked twice only one will succeed.
#7863
The sampling-based profiler in Wasmtime now takes an explicit argument of the time delta between samples. #7873
Many accessors for type information now require an &Engine argument to be
specified in preparation for an implementation of wasm GC.
#7892
The host header is now forbidden in wasi-http.
#7905
Stronger type-checks are now performed for host-owned resources when interacting with the component model to help catch mistakes earlier. #7902
Demangling Rust and C/C++ symbols in WebAssembly modules is now done by default in the C API. #7962
Preview2-based APIs are now located at the root of the wasmtime_wasi crate
instead of a submodule.
#7933
Components now reserve index 0 for handle tables to match the component model specification. #7661
Support for externref has been moved behind a new gc Cargo feature. This
will also gate support for wasm gc in the future.
#7975
Require the WASMTIME_WASI_CONFIG_PREOPEN_SOCKET_ALLOW environment variable
to bet set to allow the use of wasi_config_preopen_socket via the c api, as
it will be deprecated in 20.0.0.
#8053
Released 2024-03-12
Released 2024-02-28.
ireduce rewrite to
unary and binary operations, leading to miscompilations.
#8005
Released 2024-02-28
ireduce rewrite to
unary and binary operations, leading to miscompilations.
#8005