Wasmtime

Released 2024-02-07

Fixed

* Fix an egraph elaboration fuzzbug that was allowing values with dependencies
that shouldn't be duplicated to be chosen in a context that would make them
invalid.
[7859](https://github.com/bytecodealliance/wasmtime/pull/7859)
[7879](https://github.com/bytecodealliance/wasmtime/pull/7879)
* Fix an egraph rule bug that was allowing unconstrained recursion through the
DFG to run away on large functions.
[7882](https://github.com/bytecodealliance/wasmtime/pull/7882)

--------------------------------------------------------------------------------

Released 2024-01-25

The major feature of this release is that the WASI support in Wasmtime is now
considered stable and flagged at an 0.2.0 version approved by the WASI subgroup.
The release was delayed a few days to hold off until the WASI subgroup voted to
approve the CLI and HTTP worlds and they're now on-by-default! Additionally the
component model is now enabled by default in Wasmtime, for example an opt-in
flag is no longer required on the CLI. Note that embeddings still must opt-in to
using the component model by using the `wasmtime::component` module.

Added

* Cranelift optimizations have been added for "3-way comparisons", or `Ord::cmp`
in Rust or `<=>` in C++.
[7636](https://github.com/bytecodealliance/wasmtime/pull/7636)
[7702](https://github.com/bytecodealliance/wasmtime/pull/7702)

* Components now use Wasmtime's compilation cache used for core wasm modules by
default.
[7649](https://github.com/bytecodealliance/wasmtime/pull/7649)

* The `Resource<T>` and `ResourceAny` types can now be converted between each
other.
[7649](https://github.com/bytecodealliance/wasmtime/pull/7649)
[7712](https://github.com/bytecodealliance/wasmtime/pull/7712)

Changed

* Minor changes have been made to a number of WITs as they progressed to their
official 0.2.0 status.
[7625](https://github.com/bytecodealliance/wasmtime/pull/7625)
[7640](https://github.com/bytecodealliance/wasmtime/pull/7640)
[7690](https://github.com/bytecodealliance/wasmtime/pull/7690)
[7781](https://github.com/bytecodealliance/wasmtime/pull/7781)
[7817](https://github.com/bytecodealliance/wasmtime/pull/7817)

* The component model is now enabled by default.
[7821](https://github.com/bytecodealliance/wasmtime/pull/7821)

* The implementation of `memory.atomic.{wait,notify}` has been rewritten.
[7629](https://github.com/bytecodealliance/wasmtime/pull/7629)

* The `wasmtime_wasi::preview2::Table` type has been moved to
`wasmtime::component::ResourceTable`.
[7655](https://github.com/bytecodealliance/wasmtime/pull/7655)

* Creating a UDP stream now validates the address being sent to.
[7648](https://github.com/bytecodealliance/wasmtime/pull/7648)

* Defining resource types in `Linker<T>` now takes the type to define as a
runtime parameter.
[7680](https://github.com/bytecodealliance/wasmtime/pull/7680)

* Socket address checks can now be performed dynamically at runtime.
[7662](https://github.com/bytecodealliance/wasmtime/pull/7662)

* Wasmtime and Cranelift's MSRV is now 1.73.0.
[7739](https://github.com/bytecodealliance/wasmtime/pull/7739)

Fixed

* Bindings for WIT APIs where interfaces have multiple versions are now fixed by
putting the version in the generated binding names.
[7656](https://github.com/bytecodealliance/wasmtime/pull/7656)

* The preview1 `fd_{read,write}` APIs are now fixed when a shared memory is
used.
[7755](https://github.com/bytecodealliance/wasmtime/pull/7755)

* The preview1 `fd_{read,write}` APIs no longer leak an intermediate stream
created.
[7819](https://github.com/bytecodealliance/wasmtime/pull/7819)

--------------------------------------------------------------------------------

Released 2023-12-20

Added

* Add yielding support in `wasmtime_store_epoch_deadline_callback` in the C API.
[7476](https://github.com/bytecodealliance/wasmtime/pull/7476)

* Support for the `wasi_unstable` module ("wasi preview0" canonically) has been
added to the `-Spreview2` support in the CLI.
[7548](https://github.com/bytecodealliance/wasmtime/pull/7548)

* The original module can now be obtained from an "instance pre" in the C API.
[7572](https://github.com/bytecodealliance/wasmtime/pull/7572)

* Usage of Mach ports on macOS can now be disabled in the C API.
[7595](https://github.com/bytecodealliance/wasmtime/pull/7595)

Changed

* The preview1-to-preview2 component adapters now import a smaller number of
interfaces by default.
[7543](https://github.com/bytecodealliance/wasmtime/pull/7543)
[7544](https://github.com/bytecodealliance/wasmtime/pull/7544)

* Wasmtime and Cranelift now require Rust 1.72.0 to build.
[7554](https://github.com/bytecodealliance/wasmtime/pull/7554)

* The default `world` supported by `wasmtime serve` has been slimmed down to
exactly what `wasi:http/proxy` specifies by default. Support for other WASI
APIs can be included with the `-S common` command-line flag.
[7597](https://github.com/bytecodealliance/wasmtime/pull/7597)

* The `wasmtime --version` CLI output will now include date/commit information
when Wasmtime is built from a git checkout.
[7610](https://github.com/bytecodealliance/wasmtime/pull/7610)

* Debug intrinsic symbols required by LLDB and GDB have been moved behind a
`debug-builtins` feature of the `wasmtime` crate which is enabled by default.
[7626](https://github.com/bytecodealliance/wasmtime/pull/7626)

Fixed

* MPK support is now explicitly disabled on AMD-based CPUs since the
implementation does not currently support it.
[7513](https://github.com/bytecodealliance/wasmtime/pull/7513)

* Initialization of a WebAssembly data segment with a negative offset is fixed
to zero-extend the offset instead of sign-extend.
[7559](https://github.com/bytecodealliance/wasmtime/pull/7559)

* The reported offset of `O_APPEND` files in preview1 has been fixed.
[7586](https://github.com/bytecodealliance/wasmtime/pull/7586)

* MPK support does a better job of compacting memories to minimize virtual
memory used.
[7622](https://github.com/bytecodealliance/wasmtime/pull/7622)

Cranelift

* Union node bitpacking has been fixed with egraph optimizations to ensure the
minimal cost node is selected.
[7465](https://github.com/bytecodealliance/wasmtime/pull/7465)

* Equivalent-cost expressions now have ties broken with expression depth in
egraphs to prefer "shallow" expression trees.
[7456](https://github.com/bytecodealliance/wasmtime/pull/7456)

* Long-and-narrow chains of expressions are now optimized into shallow-and-wide
trees.
[7466](https://github.com/bytecodealliance/wasmtime/pull/7466)

--------------------------------------------------------------------------------

Released 2023-12-01.

Fixed

* The `wasi:random/insecure{,_seed}` interfaces are now available through the
CLI.
[7614](https://github.com/bytecodealliance/wasmtime/pull/7614)

* A stray debugging `println!` was removed.
[7618](https://github.com/bytecodealliance/wasmtime/pull/7618)

--------------------------------------------------------------------------------

Released 2023-11-20

Added

* Multiple versions of interfaces are now supported in `bindgen!`.
[7172](https://github.com/bytecodealliance/wasmtime/pull/7172)

* UDP has been implemented in `wasi:sockets`.
[7148](https://github.com/bytecodealliance/wasmtime/pull/7148)
[7243](https://github.com/bytecodealliance/wasmtime/pull/7243)

* Support for custom stack memory allocation has been added.
[7209](https://github.com/bytecodealliance/wasmtime/pull/7209)

* The `memory_init_cow` setting can now be configured in the C API.
[7227](https://github.com/bytecodealliance/wasmtime/pull/7227)

* The `splice` method of WASI streams has been implemented.
[7234](https://github.com/bytecodealliance/wasmtime/pull/7234)

* Wasmtime binary releases now have a `wasmtime-min` executable in addition to
`libwasmtime-min.*` libraries for the C API. These showcase a minimal
build of Wasmtime for comparison.
[7282](https://github.com/bytecodealliance/wasmtime/pull/7282)
[7315](https://github.com/bytecodealliance/wasmtime/pull/7315)
[7350](https://github.com/bytecodealliance/wasmtime/pull/7350)

Changed

* Many changes to `wasi:http` WITs have happened to keep up with the proposal as
it prepares to reach a more stable status.
[7161](https://github.com/bytecodealliance/wasmtime/pull/7161)
[7406](https://github.com/bytecodealliance/wasmtime/pull/7406)
[7383](https://github.com/bytecodealliance/wasmtime/pull/7383)
[7417](https://github.com/bytecodealliance/wasmtime/pull/7417)
[7451](https://github.com/bytecodealliance/wasmtime/pull/7451)

* Add an error resource to WASI streams.
[7152](https://github.com/bytecodealliance/wasmtime/pull/7152)

* Syntax in `bindgen!`'s `trappable_error_type` configuration has changed.
[7170](https://github.com/bytecodealliance/wasmtime/pull/7170)

* TCP errors in `wasi:sockets` have been simplified and clarified.
[7120](https://github.com/bytecodealliance/wasmtime/pull/7120)

* Wasmtime/Cranelift now require Rust 1.71.0 to compile.
[7206](https://github.com/bytecodealliance/wasmtime/pull/7206)

* Logging in Wasmtime is now configured with `WASMTIME_LOG` instead of
`RUST_LOG`.
[7239](https://github.com/bytecodealliance/wasmtime/pull/7239)

* Fuel-related APIs on `Store` have been refactored and reimplemented with two
new methods `set_fuel` and `reset_fuel`. Previous methods have been removed.
[7240](https://github.com/bytecodealliance/wasmtime/pull/7240)
[7298](https://github.com/bytecodealliance/wasmtime/pull/7298)

* The `forward` method of WASI streams has been removed.
[7234](https://github.com/bytecodealliance/wasmtime/pull/7234)

* The WebAssembly `threads`, `multi-memory`, and `relaxed-simd` proposals are
now enabled by default.
[7285](https://github.com/bytecodealliance/wasmtime/pull/7285)

* Logging is now implemented for `wasmtime serve`.
[7366](https://github.com/bytecodealliance/wasmtime/pull/7366)

* Filesystem locking has been temporarily removed from WASI.
[7355](https://github.com/bytecodealliance/wasmtime/pull/7355)

* Wasmtime's implementation of WASI preview1 built on top of preview2
(`-Spreview2`) has been enabled by default.
[7365](https://github.com/bytecodealliance/wasmtime/pull/7365)

* The `wasi:clocks` interface now has two `subscribe` functions and a `duration`
type.
[7358](https://github.com/bytecodealliance/wasmtime/pull/7358)

* The `wasi:io/poll` interface has seen some refactoring.
[7427](https://github.com/bytecodealliance/wasmtime/pull/7427)

Fixed

* Profiling the first function in a module now works.
[7254](https://github.com/bytecodealliance/wasmtime/pull/7254)

* Consecutive writes to files in preview2 have been fixed.
[7394](https://github.com/bytecodealliance/wasmtime/pull/7394)

* Copy-on-write initialization of linear memories has been fixed for components.
[7459](https://github.com/bytecodealliance/wasmtime/pull/7459)

Cranelift

* Support for proof-carrying code has been added to Cranelift to assist with an
extra layer of validation about properties such as WebAssembly memory accesses
in the future.
[7165](https://github.com/bytecodealliance/wasmtime/pull/7165)
[7180](https://github.com/bytecodealliance/wasmtime/pull/7180)
[7219](https://github.com/bytecodealliance/wasmtime/pull/7219)
[7231](https://github.com/bytecodealliance/wasmtime/pull/7231)
[7262](https://github.com/bytecodealliance/wasmtime/pull/7262)
[7263](https://github.com/bytecodealliance/wasmtime/pull/7263)
[7274](https://github.com/bytecodealliance/wasmtime/pull/7274)
[7280](https://github.com/bytecodealliance/wasmtime/pull/7280)
[7281](https://github.com/bytecodealliance/wasmtime/pull/7281)
[7352](https://github.com/bytecodealliance/wasmtime/pull/7352)
[7389](https://github.com/bytecodealliance/wasmtime/pull/7389)
[7468](https://github.com/bytecodealliance/wasmtime/pull/7468)

* Rematerialization of values no longer accidentally overrides LICM.
[7306](https://github.com/bytecodealliance/wasmtime/pull/7306)

* Inline stack probes no longer make Valgrind unhappy.
[7470](https://github.com/bytecodealliance/wasmtime/pull/7470)

--------------------------------------------------------------------------------

Released 2023-11-01

Fixed

* Using the `--dir` argument combined with a `::`-remapped path no longer prints
a warning about compatibility with the old CLI and works with remapping.
[7416](https://github.com/bytecodealliance/wasmtime/pull/7416)

* Consecutive file writes in preview2 have been fixed.
[7394](https://github.com/bytecodealliance/wasmtime/pull/7394)

--------------------------------------------------------------------------------