Its very hard. This post is about compiling a much simpler language with well defined semantics. Ruby and Python are simply not very well defined or simple, unl

Its very hard. This post is about compiling a much simpler language with well defined semantics. Ruby and Python are simply not very well defined or simple, unlike Lua, which is why PyPy is a much more complex solution than LuaJIT (indeed Lua was chosen for LuaJIT for these reasons). Simplicity has performance benefits.