Wasm Builders 🧱

gunjan agarwal
gunjan agarwal

Posted on

Compiling Rust to webassembly

#rust #opensource #webassembly #learning

Hundreds of companies around the world are using Rust in production today for fast, low-resource, cross-platform solutions. Software you know and love, like Firefox, Dropbox, and Cloudflare, uses Rust. From startups to large corporations, from embedded devices to scalable web services, Rust is a great fit.

Rust is also, widely used in confidential computing applications to provide secure environments.

Environment setup

  • Rust 
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
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  • Wasmtime 
curl https://wasmtime.dev/install.sh -sSf | bash
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  • WebAssembly Rust toolchain 
 rustup target install wasm32-wasi
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There are 3 steps

  1. Compile the rust code
  2. Compile rust code to WASM Binary
  3. Execute it using WASM Runtime

So, lets start.

Compile the Rust code

  • make the new project at any preferred location in your machine 
cargo new sum-of-2-nos
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  • open your favorite code editor and write rust code. (Here I am demonstrating sum of 2 numbers) in main.rs. 
use std::io;
use std::{i32};

fn main() {
          // User will enter first number

          println!("Input First number");

          let mut var1 = String::new();

          io::stdin().read_line(&mut var1).expect("Unable to read entered data");

          // User will enter Second number

          println!("Input second number");
          let mut var2 = String::new();
          io::stdin().read_line(&mut var2).expect("Unable to read entered data");

          // Converting string to integer
          let a: i32 = var1.trim().parse().ok().expect("Program only processes numbers, Enter number");
          let b: i32 = var2.trim().parse().ok().expect("Program only processes numbers, Enter number");

          // Output of basic operations
          println!("The sum of a &  b is : {}", a + b);

}
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  • complile and execute rust code. 
cargo build
cargo run
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Terminal-ss

Compile Rust code to WASM Binary

It can be done using following command.

cargo build --target=wasm32-wasi
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We have now converted our rust code to web assembly code.

ss

Execute it using WASM Runtime

Execute the following command to see the results.

cd target/wasm32-wasi/debug
wasmtime sum-of-2-nos.wasm
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ss

Happy Hacking :)

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