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| #![feature(lang_items)] | |
| #![no_std] | |
| #[no_mangle] | |
| pub fn add_one(x: i32) -> i32 { | |
| x + 1 | |
| } | |
| // 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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| $ rustup update nightly | |
| $ rustup target add wasm32-unknown-unknown --toolchain nightly | |
| $ rustc +nightly --target wasm32-unknown-unknown -O .\add.rs --crate-type=cdylib | |
| $ cargo install --git https://github.com/alexcrichton/wasm-gc | |
| $ wasm-gc .\add.wasm small-add.wasm |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>wasm wasm wasm</title> | |
| <script> | |
| fetch('small-add.wasm').then(response => | |
| response.arrayBuffer() | |
| ).then(bytes => | |
| WebAssembly.instantiate(bytes, {}) | |
| ).then(results => { | |
| alert(results.instance.exports.add_one(41)); | |
| }); | |
| </script> | |
| </head> | |
| </html> |
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