674a6208d8
* Enable the already-passing `bulk-memoryoperations/imports.wast` test * Implement support for the `memory.init` instruction and passive data This adds support for passive data segments and the `memory.init` instruction from the bulk memory operations proposal. Passive data segments are stored on the Wasm module and then `memory.init` instructions copy their contents into memory. * Implement the `data.drop` instruction This allows wasm modules to deallocate passive data segments that it doesn't need anymore. We keep track of which segments have not been dropped on an `Instance` and when dropping them, remove the entry from the instance's hash map. The module always needs all of the segments for new instantiations. * Enable final bulk memory operations spec test This requires special casing an expected error message for an `assert_trap`, since the expected error message contains the index of an uninitialized table element, but our trap implementation doesn't save that diagnostic information and shepherd it out.
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.
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.