666c2554ea
* Run the GC smoketest with epoch support enabled as well. * Handle safepoints in cold blocks properly. Currently, the way that we find safepoint slots for a given instruction relies on the instruction index order in the safepoint list matching the order of instruction emission. Previous to the introduction of cold-block support, this was trivially satisfied by sorting the safepoint list: we emit instructions 0, 1, 2, 3, 4, ..., and so if we have safepoints at instructions 1 and 4, we will encounter them in that order. However, cold blocks are supported by swizzling the emission order at the last moment (to avoid having to renumber instructions partway through the compilation pipeline), so we actually emit instructions out of index order when cold blocks are present. Reference-type support in Wasm in particular uses cold blocks for slowpaths, and has live refs and safepoints in these slowpaths, so we can reliably "skip" a safepoint (not emit any metadata for it) in the presence of reftype usage. This PR fixes the emission code by building a map from instruction index to safepoint index first, then doing lookups through this map, rather than following along in-order as it emits instructions.
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.
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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 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.