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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
tree | f435a8308119effd964b339f76abb83a57c29483 /third_party/rust/wasi/README.md | |
parent | Initial commit. (diff) | |
download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/rust/wasi/README.md')
-rw-r--r-- | third_party/rust/wasi/README.md | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/third_party/rust/wasi/README.md b/third_party/rust/wasi/README.md new file mode 100644 index 0000000000..801f56a4e0 --- /dev/null +++ b/third_party/rust/wasi/README.md @@ -0,0 +1,94 @@ +<div align="center"> + <h1><code>wasi</code></h1> + +<strong>A <a href="https://bytecodealliance.org/">Bytecode Alliance</a> project</strong> + + <p> + <strong>WASI API Bindings for Rust</strong> + </p> + + <p> + <a href="https://crates.io/crates/wasi"><img src="https://img.shields.io/crates/v/wasi.svg?style=flat-square" alt="Crates.io version" /></a> + <a href="https://crates.io/crates/wasi"><img src="https://img.shields.io/crates/d/wasi.svg?style=flat-square" alt="Download" /></a> + <a href="https://docs.rs/wasi/"><img src="https://img.shields.io/badge/docs-latest-blue.svg?style=flat-square" alt="docs.rs docs" /></a> + </p> +</div> + +This crate contains API bindings for [WASI](https://github.com/WebAssembly/WASI) +system calls in Rust, and currently reflects the `wasi_snapshot_preview1` +module. This crate is quite low-level and provides conceptually a "system call" +interface. In most settings, it's better to use the Rust standard library, which +has WASI support. + +The `wasi` crate is also entirely procedurally generated from the `*.witx` files +describing the WASI apis. While some conveniences are provided the bindings here +are intentionally low-level! + +# Usage + +First you can depend on this crate via `Cargo.toml`: + +```toml +[dependencies] +wasi = "0.8.0" +``` + +Next you can use the APIs in the root of the module like so: + +```rust +fn main() { + let stdout = 1; + let message = "Hello, World!\n"; + let data = [wasi::Ciovec { + buf: message.as_ptr(), + buf_len: message.len(), + }]; + wasi::fd_write(stdout, &data).unwrap(); +} +``` + +Next you can use a tool like [`cargo +wasi`](https://github.com/bytecodealliance/cargo-wasi) to compile and run your +project: + +To compile Rust projects to wasm using WASI, use the `wasm32-wasi` target, +like this: + +``` +$ cargo wasi run + Compiling wasi v0.8.0+wasi-snapshot-preview1 + Compiling wut v0.1.0 (/code) + Finished dev [unoptimized + debuginfo] target(s) in 0.34s + Running `/.cargo/bin/cargo-wasi target/wasm32-wasi/debug/wut.wasm` + Running `target/wasm32-wasi/debug/wut.wasm` +Hello, World! +``` + +# Development + +The bulk of the `wasi` crate is generated by the `witx-bindgen` tool, which lives at +`crates/witx-bindgen` and is part of the cargo workspace. + +The `src/lib_generated.rs` file can be re-generated with the following +command: + +``` +cargo run -p witx-bindgen -- crates/witx-bindgen/WASI/phases/snapshot/witx/wasi_snapshot_preview1.witx > src/lib_generated.rs +``` + +Note that this uses the WASI standard repository as a submodule. If you do not +have this submodule present in your source tree, run: +``` +git submodule update --init +``` + +# License + +This project is licensed under the Apache 2.0 license with the LLVM exception. +See [LICENSE](LICENSE) for more details. + +### Contribution + +Unless you explicitly state otherwise, any contribution intentionally submitted +for inclusion in this project by you, as defined in the Apache-2.0 license, +shall be licensed as above, without any additional terms or conditions. |