6fbddc1931
* Replace some cfg(debug) with cfg(debug_assertions)
Cargo nor rustc ever sets `cfg(debug)` automatically, so it's expected
that these usages were intended to be `cfg(debug_assertions)`.
* Fix MachBuffer debug-assertion invariant checks.
We should only check invariants when we expect them to be true --
specifically, before the branch-simplification algorithm runs. At other
times, they may be temporarily violated: e.g., after
`add_{cond,uncond}_branch()` but before emitting the branch bytes. This
is the expected sequence, and the rest of the code is consistent with
that.
Some of the checks also were not quite right (w.r.t. the written
invariants); specifically, we should not check validity of a label's
offset when the label has been aliased to another label.
It seems that this is an unfortunate consequence of leftover
debug-assertions that weren't actually being run, so weren't kept
up-to-date. Should no longer happen now that we actually check these!
Co-authored-by: Chris Fallin <chris@cfallin.org>
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, generate code blazingly fast with Lightbeam, 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 - [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.