Lua Quick Start Guide

Introspective information

Lua provides the debug.getinfo function to inspect the currently running code. This function takes one of two arguments, either a function or an integer. When the argument is an integer, getinfo will look the specified number of steps up the callstack. For example, let's assume you have the following code:

function one()   print ("one")endfunction two()  one()  print("two")endfunction three()  two()  print("three")  debug.getinfo(1)end

Providing an argument of 1 will inspect the function calling debug.getinfo, or function three. Providing 2 will go one more function up the callstack, inspecting function two. Or, providing 3 will look even further up the callstack and inspect function one.