Rust bindings for WABT. Work in progress.
Add this to your Cargo.toml:
toml
[dependencies]
wabt = "0.2"
wat2wasm (previously known as wast2wasm):
```rust extern crate wabt; use wabt::wat2wasm;
fn main() { assert_eq!( wat2wasm("(module)").unwrap(), &[ 0, 97, 115, 109, // \0ASM - magic 1, 0, 0, 0 // 0x01 - version ] ); } ```
wasm2wat:
rust
extern crate wabt;
use wabt::wasm2wat;
fn main() {
assert_eq!(
wasm2wat(&[
0, 97, 115, 109, // \0ASM - magic
1, 0, 0, 0 // 01 - version
]),
Ok("(module)\n".to_owned()),
);
}
wabt can be also used for parsing the official testsuite scripts.
```rust use wabt::script::{ScriptParser, Command, CommandKind, Action, Value};
let wast = r#"
;; Define anonymous module with function export named sub.
(module
(func (export "sub") (param $x i32) (param $y i32) (result i32)
;; return x - y;
(i32.sub
(getlocal $x) (getlocal $y)
)
)
)
;; Assert that invoking export sub with parameters (8, 3)
;; should return 5.
(assert_return
(invoke "sub"
(i32.const 8) (i32.const 3)
)
(i32.const 5)
)
"#;
let mut parser = ScriptParser::fromstr(wast)?; while let Some(Command { kind, .. }) = parser.next()? { match kind { CommandKind::Module { module, name } => { // The module is declared as annonymous. asserteq!(name, None);
// Convert the module into the binary representation and check the magic number.
let module_binary = module.into_vec()?;
assert_eq!(&module_binary[0..4], &[0, 97, 115, 109]);
}
CommandKind::AssertReturn { action, expected } => {
assert_eq!(action, Action::Invoke {
module: None,
field: "sub".to_string(),
args: vec![
Value::I32(8),
Value::I32(3)
],
});
assert_eq!(expected, vec![Value::I32(5)]);
},
_ => panic!("there are no other commands apart from that defined above"),
}
} ```