Inside Julia compiler/runtime there is an interpreter, because Julia uses a heuristic to determine whether to compile or interpret a function. There is also int

Inside Julia compiler/runtime there is an interpreter, because Julia uses a heuristic to determine whether to compile or interpret a function. There is also interpreter code in Julia debugger. I don't know how full featured they are, but one does not have to start from scratch. On the other hand, implementing a tracing JIT for Julia is going to be such a big task, I am not sure how much help existing interpreters are going to be. At the very least there needs to be a new GC, which necessitates changes everywhere except the parser. LLVM integration may also prove awkward for a tracing JIT.