V8 Bytecode — Decompiler

function max(x, y) return x > y ? x : y;

function add(a, b) return a + b;

def recover_structures(self): # Match patterns: if-else, loops, try-catch # Transform CFG into AST nodes pass v8 bytecode decompiler

def ssa_convert(self): # Rename registers to virtual variables pass function max(x, y) return x > y

1. Introduction V8, Google’s high-performance JavaScript and WebAssembly engine, compiles JavaScript code through multiple tiers. The first executed tier is Ignition — a register-based bytecode interpreter. While V8 is famous for its TurboFan optimizing compiler, the bytecode generated by Ignition contains a structured, high-level representation of the original source code. The first executed tier is Ignition — a

def build_cfg(self): # Split at jumps, create basic blocks pass

def generate_js(self, ast): # Recursive JS code emission pass Input V8 bytecode (from function max(x, y) return x > y ? x : y; ):