Welcome to AHA! Lang

AHA! Lang — Advanced Hybrid Architecture — is a modern programming language with an LLVM backend. It is designed to be understood at a glance, yet strong enough to build real software.

What is AHA! Lang?

AHA! is a complete compiler project written in Rust. Source code flows through a lexer, a Pratt parser, a type-checking pass, LLVM IR code generation, and finally JIT execution — all inside one binary. No interpreter, no transpiler, no magic.

• LLVM-Powered — compiles to LLVM IR and executes through a built-in JIT
• Expression-oriented — the last expression is the result; if/else produces values
• Real type system — Int, Bool, and String are checked at compile time
• Boolean algebra that composes — comparisons and &&/|| return Int 0/1
• Strings done right — a {pointer, length} struct with O(1) len()
• Honest tooling — clean CLI, VS Code extension, 305+ tests running in CI

Quick Links

A First Taste

AHA! is expression-oriented — every construct that can be a value is a value:

// the last expression of the program is its result
let x = 10;
let y = 20;

if x > y {
    x
} else {
    y
}

Run it through the JIT and you get 20.

Requirements

• Rust (stable toolchain)
• LLVM 14 with Clang 14 and Polly (one-line install on Ubuntu/Debian)

See Getting Started for the full setup.