7d05ebe7ff
* Move wasm data/debuginfo into the ELF compilation image This commit moves existing allocations of `Box<[u8]>` stored separately from compilation's final ELF image into the ELF image itself. The goal of this commit is to reduce the amount of data which `bincode` will need to process in the future. DWARF debugging information and wasm data segments can be quite large, and they're relatively rarely read, so there's typically no need to copy them around. Instead by moving them into the ELF image this opens up the opportunity in the future to eliminate copies and use data directly as-found in the image itself. For information accessed possibly-multiple times, such as the wasm data ranges, the indexes of the data within the ELF image are computed when a `CompiledModule` is created. These indexes are then used to directly index into the image without having to root around in the ELF file each time they're accessed. One other change located here is that the symbolication context previously cloned the debug information into it to adhere to the `'static` lifetime safely, but this isn't actually ever used in `wasmtime` right now so the unsafety around this has been removed and instead borrowed data is returned (no more clones, yay!). * Fix lightbeam
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 - [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.