9c5c872b3b
This adds support for all atomic operations that were unimplemented so far in the s390x back end: - atomic_rmw operations xchg, nand, smin, smax, umin, umax - $I8 and $I16 versions of atomic_rmw and atomic_cas - little endian versions of atomic_rmw and atomic_cas All of these have to be implemented by a compare-and-swap loop; and for the $I8 and $I16 versions the actual atomic instruction needs to operate on the surrounding aligned 32-bit word. Since we cannot emit new control flow during ISLE instruction selection, these compare-and-swap loops are emitted as a single meta-instruction to be expanded at emit time. However, since there is a large number of different versions of the loop required to implement all the above operations, I've implemented a facility to allow specifying the loop bodies from within ISLE after all, by creating a vector of MInst structures that will be emitted as part of the meta-instruction. There are still restrictions, in particular instructions that are part of the loop body may not modify any virtual register. But even so, this approach looks preferable to doing everything in emit.rs. A few instructions needed in those compare-and-swap loop bodies were added as well, in particular the RxSBG family of instructions as well as the LOAD REVERSED in-register byte-swap instructions. This patch also adds filetest runtests to verify the semantics of all operations, in particular the subword and little-endian variants (those are currently only executed on s390x).
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.
-
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.