# Wasmtime Releases -------------------------------------------------------------------------------- ## 0.13.0 Unreleased ### Added * Lots of documentation of `wasmtime` has been updated. Be sure to check out the [book](https://bytecodealliance.github.io/wasmtime/) and [API documentation](https://bytecodealliance.github.io/wasmtime/api/wasmtime/)! * All wasmtime example programs are now in a top-level `examples` directory and are available in both C and Rust. [#1286](https://github.com/bytecodealliance/wasmtime/pull/1286) * A `wasmtime::Linker` type was added to conveniently link link wasm modules together and create instances that reference one another. [#1384](https://github.com/bytecodealliance/wasmtime/pull/1384) * Wasmtime now has "jitdump" support enabled by default which allows [profiling wasm code on linux][jitdump]. [#1310](https://github.com/bytecodealliance/wasmtime/pull/1310) * The `wasmtime::Caller` type now exists as a first-class way to access the caller's exports, namely memory, when implementing host APIs. This can be the first argument of functions defined with `Func::new` or `Func::wrap` which allows easily implementing methods which take a pointer into wasm memory. Note that this only works for accessing the caller's `Memory` for now and it must be exported. This will eventually be replaced with a more general-purpose mechanism like interface types. [#1290](https://github.com/bytecodealliance/wasmtime/pull/1290) * The bulk memory proposal has been fully implemented. [#1264](https://github.com/bytecodealliance/wasmtime/pull/1264) [#976](https://github.com/bytecodealliance/wasmtime/pull/976) * Virtual file support has been added to `wasi-common`. [#701](https://github.com/bytecodealliance/wasmtime/pull/701) * The C API has been enhanced with a Wasmtime-specific `wasmtime_wat2wasm` to parse `*.wat` files via the C API. [#1206](https://github.com/bytecodealliance/wasmtime/pull/1206) [jitdump]: https://bytecodealliance.github.io/wasmtime/examples-profiling.html ### Changed * The `wast` and `wasm2obj` standalone binaries have been removed. They're available via the `wasmtime wast` and `wasmtime wasm2obj` subcommands. [#1372](https://github.com/bytecodealliance/wasmtime/pull/1372) * The `wasi-common` crate now uses the new `wiggle` crate to auto-generate a trait which is implemented for the current wasi snapshot. [#1202](https://github.com/bytecodealliance/wasmtime/pull/1202) * Wasmtime no longer has a dependency on a C++ compiler. [#1365](https://github.com/bytecodealliance/wasmtime/pull/1365) * The `Func::wrapN` APIs have been consolidated into one `Func::wrap` API. [#1363](https://github.com/bytecodealliance/wasmtime/pull/1363) * The `Callable` trait has been removed and now `Func::new` takes a closure directly. [#1363](https://github.com/bytecodealliance/wasmtime/pull/1363) * The Cranelift repository has been merged into the Wasmtime repository. * Support for interface types has been temporarily removed. [#1292](https://github.com/bytecodealliance/wasmtime/pull/1292) * The exit code of the `wasmtime` CLI has changed if the program traps. [#1274](https://github.com/bytecodealliance/wasmtime/pull/1274) * The `wasmtime` CLI now logs to stderr by default and the `-d` flag has been renamed to `--log-to-file`. [#1266](https://github.com/bytecodealliance/wasmtime/pull/1266) * Values cannot cross `Store` objects, meaning you can't instantiate a module with values from different stores nor pass values from different stores into methods. [#1016](https://github.com/bytecodealliance/wasmtime/pull/1016) -------------------------------------------------------------------------------- ## 0.12.0 Released 2020-02-26. ### Added * Support for the [WebAssembly text annotations proposal][annotations-proposal] has been added. [#998](https://github.com/bytecodealliance/wasmtime/pull/998) * An initial C API for instantiating WASI modules has been added. [#977](https://github.com/bytecodealliance/wasmtime/pull/977) * A new suite of `Func::getN` functions have been added to the `wasmtime` API to call statically-known function signatures in a highly optimized fashion. [#955](https://github.com/bytecodealliance/wasmtime/pull/955) * Initial support for profiling JIT code through perf jitdump has been added. [#360](https://github.com/bytecodealliance/wasmtime/pull/360) * More CLI flags corresponding to proposed WebAssembly features have been added. [#917](https://github.com/bytecodealliance/wasmtime/pull/917) [annotations-proposal]: https://github.com/webassembly/annotations ### Changed * The `wasmtime` CLI as well as embedding API will optimize WebAssembly code by default now. [#973](https://github.com/bytecodealliance/wasmtime/pull/973) [#988](https://github.com/bytecodealliance/wasmtime/pull/988) * The `verifier` pass in Cranelift is now no longer run by default when using the embedding API. [#882](https://github.com/bytecodealliance/wasmtime/pull/882) ### Fixed * Code caching now accurately accounts for optimization levels, ensuring that if you ask for optimized code you're not accidentally handed unoptimized code from the cache. [#974](https://github.com/bytecodealliance/wasmtime/pull/974) * Automated releases for tags should be up and running again, along with automatic publication of the `wasmtime` Python package. [#971](https://github.com/bytecodealliance/wasmtime/pull/971)