4376cf2609
* Add differential fuzzing against V8 This commit adds a differential fuzzing target to Wasmtime along the lines of the wasmi and spec interpreters we already have, but with V8 instead. The intention here is that wasmi is unlikely to receive updates over time (e.g. for SIMD), and the spec interpreter is not suitable for fuzzing against in general due to its performance characteristics. The hope is that V8 is indeed appropriate to fuzz against because it's naturally receiving updates and it also is expected to have good performance. Here the `rusty_v8` crate is used which provides bindings to V8 as well as precompiled binaries by default. This matches exactly the use case we need and at least for now I think the `rusty_v8` crate will be maintained by the Deno folks as they continue to develop it. If it becomes an issue though maintaining we can evaluate other options to have differential fuzzing against. For now this commit enables the SIMD and bulk-memory feature of fuzz-target-generation which should enable them to get differentially-fuzzed with V8 in addition to the compilation fuzzing we're already getting. * Use weak linkage for GDB jit helpers This should help us deduplicate our symbol with other JIT runtimes, if any. For now this leans on some C helpers to define the weak linkage since Rust doesn't support that on stable yet. * Don't use rusty_v8 on MinGW They don't have precompiled libraries there. * Fix msvc build * Comment about execution
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.
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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 - [C++] - the
wasmtime-cpprepository - 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.