b73b831892
This commit removes the binaryen support for fuzzing from wasmtime, instead switching over to `wasm-smith`. In general it's great to have what fuzzing we can, but our binaryen support suffers from a few issues: * The Rust crate, binaryen-sys, seems largely unmaintained at this point. While we could likely take ownership and/or send PRs to update the crate it seems like the maintenance is largely on us at this point. * Currently the binaryen-sys crate doesn't support fuzzing anything beyond MVP wasm, but we're interested at least in features like bulk memory and reference types. Additionally we'll also be interested in features like module-linking. New features would require either implementation work in binaryen or the binaryen-sys crate to support. * We have 4-5 fuzz-bugs right now related to timeouts simply in generating a module for wasmtime to fuzz. One investigation along these lines in the past revealed a bug in binaryen itself, and in any case these bugs would otherwise need to get investigated, reported, and possibly fixed ourselves in upstream binaryen. Overall I'm not sure at this point if maintaining binaryen fuzzing is worth it with the advent of `wasm-smith` which has similar goals for wasm module generation, but is much more readily maintainable on our end. Additonally in this commit I've added a fuzzer for wasm-smith's `SwarmConfig`-based fuzzer which should expand the coverage of tested modules. Closes #2163
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.
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Configurable. Whether you need to precompile your wasm ahead of time, generate code blazingly fast with Lightbeam, or interpret it at runtime, Wasmtime has you covered for all your wasm-executing needs.
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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 - 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.