Released 2022-11-21
Added
* New `WasiCtx::{push_file, push_dir}` methods exist for embedders to add their
own objects.
[5027](https://github.com/bytecodealliance/wasmtime/pull/5027)
* Wasmtime's `component-model` support now supports `async` host functions and
embedding in the same manner as core wasm.
[5055](https://github.com/bytecodealliance/wasmtime/pull/5055)
* The `wasmtime` CLI executable now supports a `--max-wasm-stack` flag.
[5156](https://github.com/bytecodealliance/wasmtime/pull/5156)
* AOT compilation support has been implemented for components (aka the
`component-model` feature of the Wasmtime crate).
[5160](https://github.com/bytecodealliance/wasmtime/pull/5160)
* A new `wasi_config_set_stdin_bytes` function is available in the C API to set
the stdin of a WASI-using module from an in-memory slice.
[5179](https://github.com/bytecodealliance/wasmtime/pull/5179)
* When using the pooling allocator there are now options to reset memory with
`memset` instead of `madvisev` on Linux to keep pages resident in memory to
reduce page faults when reusing linear memory slots.
[5207](https://github.com/bytecodealliance/wasmtime/pull/5207)
Changed
* Consuming 0 fuel with 0 fuel left is now considered to succeed. Additionally a
store may not consume its last unit of fuel.
[5013](https://github.com/bytecodealliance/wasmtime/pull/5013)
* A number of variants in the `wasi_common::ErrorKind` enum have been removed.
[5015](https://github.com/bytecodealliance/wasmtime/pull/5015)
* Methods on `WasiDir` now error-by-default instead of requiring a definition by
default.
[5019](https://github.com/bytecodealliance/wasmtime/pull/5019)
* Bindings generated by the `wiggle` crate now always depend on the `wasmtime`
crate meaning crates like `wasi-common` no longer compile for platforms such
as `wasm32-unknown-emscripten`.
[5137](https://github.com/bytecodealliance/wasmtime/pull/5137)
* Error handling in the `wasmtime` crate's API has been changed to primarily
work with `anyhow::Error` for custom errors. The `Trap` type has been replaced
with a simple `enum Trap { ... }` and backtrace information is now stored as a
`WasmBacktrace` type inserted as context into an `anyhow::Error`.
Host-functions are expected to return `anyhow::Result<T>` instead of the prior
`Trap` error return from before. Additionally the old `Trap::i32_exit`
constructor is now a concrete `wasi_commont::I32Exit` type which can be tested
for with a `downcast_ref` on the error returned from Wasmtime.
[5149](https://github.com/bytecodealliance/wasmtime/pull/5149)
* Configuration of the pooling allocator is now done through a builder-style
`PoolingAllocationConfig` API instead of the prior enum-variant API.
[5205](https://github.com/bytecodealliance/wasmtime/pull/5205)
Fixed
* The instruction cache is now properly flushed for AArch64 on Windows.
[4997](https://github.com/bytecodealliance/wasmtime/pull/4997)
* Backtrace capturing with many sequences of wasm->host calls on the stack no
longer exhibit quadratic capturing behavior.
[5049](https://github.com/bytecodealliance/wasmtime/pull/5049)
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