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steveklabnik/add.rs

Last active April 9, 2023 16:20
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Raw
add.rs
#![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 {}
}
Raw
compile.txt
$ 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
Raw
gistfile1.txt
<!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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