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Greatest common divisor in '.wasm'
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| #![feature(lang_items)] | |
| #![no_std] | |
| #[no_mangle] | |
| pub extern "C" fn gcd(mut n: i32, mut m: i32) -> i32 { | |
| assert!(n != 0 && m != 0); | |
| while m != 0 { | |
| if m < n { | |
| let t = m; | |
| m = n; | |
| n = t; | |
| } | |
| m = m % n; | |
| } | |
| n | |
| } | |
| // needed for no_std | |
| #[lang = "panic_fmt"] | |
| #[no_mangle] | |
| pub extern fn rust_begin_panic(_msg: core::fmt::Arguments, | |
| _file: &'static str, | |
| _line: u32, | |
| _column: u32) -> ! { | |
| loop {} | |
| } |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset='utf-8'> | |
| <title>wasm wasm wasm</title> | |
| </head> | |
| <body> | |
| <form id='form'> | |
| <div> | |
| <label for='a'>Number A</label> | |
| <input id='a' name='a' /> | |
| </div> | |
| <div> | |
| <label for='b'>Number B</label> | |
| <input id='b' name='b' /> | |
| </div> | |
| <div> | |
| <button type='submit'>Compute</button> | |
| </div> | |
| <div id='result'></div> | |
| </form> | |
| <script> | |
| const gcdWasm = fetch('gcd.wasm').then(response => | |
| response.arrayBuffer() | |
| ).then(bytes => | |
| WebAssembly.instantiate(bytes, {}) | |
| ).then(results => results.instance.exports.gcd); | |
| const form = document.querySelector('#form') | |
| const result = document.querySelector('#result') | |
| form.addEventListener('submit', evt => { | |
| evt.preventDefault() | |
| const d = new FormData(form) | |
| const a = parseInt(d.get('a'), 10) | |
| const b = parseInt(d.get('b'), 10) | |
| gcdWasm.then(fn => { | |
| result.innerHTML = `The GCD of those two numbers is ${fn(a, b)}` | |
| }) | |
| }) | |
| </script> | |
| </body> | |
| </html> |
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