Rust bindings for WABT.
Add this to your Cargo.toml:
[dependencies]
wabt = "0.9.0"Assemble a given program in WebAssembly text format (aka wat) and translate it into binary.
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
]
);
}or disassemble a wasm binary into the text format.
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.
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
(get_local $x) (get_local $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::<f32, f64>::from_str(wast)?;
while let Some(Command { kind, .. }) = parser.next()? {
match kind {
CommandKind::Module { module, name } => {
// The module is declared as anonymous.
assert_eq!(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"),
}
}You might find wat or wast
crate useful if you only want to parse .wat or .wast source. The advantage of using them is that
they are implemented completely in Rust. Moreover, wast among other things
allows you to add your own extensions to WebAssembly text format.
For print the text representation of a wasm binary, wasmprinter
can work better for you, since it is implemented completely in Rust.
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