Interacting with Assembly in Rust

We'll explore what tools the Rust community has to offer for extracting and embedding assembly. The Rust compiler emits various types of output, one of which is assembly. Rust also has facilities for embedding assembly.

For many Rust developers, the process of producing a binary from their Rust code is a straightforward process that doesn’t require much thought. However, modern compilers are complicated programs in and of themselves and may yield binaries that perform very differently in response to a minor change in the source code.

In diagnosing performance issues like this, inspecting the output of the compiler can be helpful. The Rust compiler emits various types of output, one of which is assembly. Rust also has facilities for embedding assembly. In this guide, we’ll explore what the Rust community has to offer for extracting and embedding assembly.

Viewing assembly

To view the assembly output of each tool, we’ll use the following example program.

const NAMES: [&'static str; 10] = [
    "Kaladin", "Teft", "Drehy", "Skar", "Rock", "Sigzil", "Moash", "Leyten", "Lopen", "Hobber",
];

fn main() {
    roll_call();
}

pub fn roll_call() {
    println!("SOUND OFF");
    for name in NAMES.iter() {
        println!("{}: HERE!", name);
    }
    let num_present = NAMES.len();
    println!("All {} accounted for!", num_present);
}

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