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Peepmatic was an early attempt at a DSL for peephole optimizations, with the idea that maybe sometime in the future we could user it for instruction selection as well. It didn't really pan out, however: * Peepmatic wasn't quite flexible enough, and adding new operators or snippets of code implemented externally in Rust was a bit of a pain. * The performance was never competitive with the hand-written peephole optimizers. It was *very* size efficient, but that came at the cost of run-time efficiency. Everything was table-based and interpreted, rather than generating any Rust code. Ultimately, because of these reasons, we never turned Peepmatic on by default. These days, we just landed the ISLE domain-specific language, and it is better suited than Peepmatic for all the things that Peepmatic was originally designed to do. It is more flexible and easy to integrate with external Rust code. It is has better time efficiency, meeting or even beating hand-written code. I think a small part of the reason why ISLE excels in these things is because its design was informed by Peepmatic's failures. I still plan on continuing Peepmatic's mission to make Cranelift's peephole optimizer passes generated from DSL rewrite rules, but using ISLE instead of Peepmatic. Thank you Peepmatic, rest in peace!
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.
-
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.