It is a small experimental interpreter example!
Custom intermediate code input (recursive fibonacci example) parsing and interpreting.
Optimizations didn't applied, application can be re-design.

$ gcc -Wall -O3 stage1.c stage2.c stage3.c -o app && ./app fib(37) = 24157817 Interpreter runs in 1505 ms fib(37) = 24157817 Real C function runs in 83 ms Interpreter 18x slow!