490d49a768
* Adjust dependency directives between crates This commit is a preparation for the release process for Wasmtime. The specific changes here are to delineate which crates are "public", and all version requirements on non-public crates will now be done with `=A.B.C` version requirements instead of today's `A.B.C` version requirements. The purpose for doing this is to assist with patch releases that might happen in the future. Patch releases of wasmtime are already required to not break the APIs of "public" crates, but no such guarantee is given about "internal" crates. This means that a patch release runs the risk, for example, of breaking an internal API. In doing so though we would also need to release a new major version of the internal crate, but we wouldn't have a great hole in the number scheme of major versions to do so. By using `=A.B.C` requirements for internal crates it means we can safely ignore strict semver-compatibility between releases of internal crates for patch releases, since the only consumers of the crate will be the corresponding patch release of the `wasmtime` crate itself (or other public crates). The `publish.rs` script has been updated with a check to verify that dependencies on internal crates are all specified with an `=` dependency, and dependnecies on all public crates are without a `=` dependency. This will hopefully make it so we don't have to worry about what to use where, we just let CI tell us what to do. Using this modification all version dependency declarations have been updated. Note that some crates were adjusted to simply remove their `version` requirement in cases such as the crate wasn't published anyway (`publish = false` was specified) or it's in the `dev-dependencies` section which doesn't need version specifiers for path dependencies. * Switch to normal sever deps for cranelift dependencies These crates will now all be considered "public" where in patch releases they will be guaranteed to not have breaking changes.
wasmtime
A standalone runtime for WebAssembly
A Bytecode Alliance project
Guide | Contributing | Website | Chat
Installation
The Wasmtime CLI can be installed on Linux and macOS with a small install script:
$ curl https://wasmtime.dev/install.sh -sSf | bash
Windows or otherwise interested users can download installers and binaries directly from the GitHub Releases page.
Example
If you've got the Rust compiler installed then you can take some Rust source code:
fn main() {
println!("Hello, world!");
}
and compile/run it with:
$ rustup target add wasm32-wasi
$ rustc hello.rs --target wasm32-wasi
$ wasmtime hello.wasm
Hello, world!
Features
-
Lightweight. Wasmtime is a standalone runtime for WebAssembly that scales with your needs. It fits on tiny chips as well as makes use of huge servers. Wasmtime can be embedded into almost any application too.
-
Fast. Wasmtime is built on the optimizing Cranelift code generator to quickly generate high-quality machine code at runtime.
-
Configurable. Whether you need to precompile your wasm ahead of time, or interpret it at runtime, Wasmtime has you covered for all your wasm-executing needs.
-
WASI. Wasmtime supports a rich set of APIs for interacting with the host environment through the WASI standard.
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Standards Compliant. Wasmtime passes the official WebAssembly test suite, implements the official C API of wasm, and implements future proposals to WebAssembly as well. Wasmtime developers are intimately engaged with the WebAssembly standards process all along the way too.
Language Support
You can use Wasmtime from a variety of different languages through embeddings of the implementation:
- Rust - the
wasmtimecrate - C - the
wasm.h,wasi.h, andwasmtime.hheaders or usewasmtimeConan package - [C++] - the
wasmtime-cpprepository or usewasmtime-cppConan package - Python - the
wasmtimePyPI package - .NET - the
WasmtimeNuGet package - Go - the
wasmtime-gorepository
Documentation
📚 Read the Wasmtime guide here! 📚
The wasmtime guide is the best starting point to learn about what Wasmtime can do for you or help answer your questions about Wasmtime. If you're curious in contributing to Wasmtime, it can also help you do that!
It's Wasmtime.