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Kotlin IR Fuzz Playground

Why I built this

I wanted to experiment with compiler fuzzing in a small and simple project. This playground generates random Kotlin programs, compiles them with kotlinc, and saves interesting crash cases for later analysis

What it does

  • Generates many small random programs (functions, loops, inline functions).
  • Compiles them with kotlinc.
  • If the compiler crashes or prints an internal error, the input is saved to crashes/ for further analysis.

How to run

python3 src/main.py --iterations 200

CLI options

  • --iterations — number of fuzzing iterations
  • --kotlinc — Kotlin compiler executable or path
  • --output-dir — directory for saved crash cases

Requirements

  • Python 3.10+
  • Kotlin compiler (kotlinc) available in PATH