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Practical WebAssembly

Converting Rust into WebAssembly via rustc

Explore the process of converting Rust programs into WebAssembly modules using the rustc compiler. Understand how the LLVM backend transforms Rust code into WebAssembly via intermediate representations and the role of the wasm32-unknown-emscripten target in targeting the Emscripten runtime. This lesson guides you through compiling and running Rust-based WebAssembly code in a browser environment.

We'll cover the following...

Rust uses the LLVM compiler, which we’ll create now, in order to generate machine-native code. rustc uses LLVM’s capability to convert the native code into a WebAssembly module. Let’s start converting Rust into a WebAssembly module using rustc.

Getting started with the project

We’ll start with Hello World:

  1. Let’s create a file called hello_world.rs:

Shell
touch hello_world.rs

  1. Start writing the Rust code:

Rust 1.40.0
fn main() {
  println!("Hello World!");
}

We have defined a main function. Similar to C, main is a special function that marks the entry point to a program after it has been ...