debug.setmetatable (value, table) Sets the metatable for the given value to the given table (which can be nil). Returns value.

debug.setlocal ([thread,] level, local, value) This function assigns the value value to the local variable with index local of the function at level level of the stack. The function returns nil if there is no local variable with the given index, and raises an error when called with a level out of range. (You can call getinfo to check whether the level is valid.) Otherwise, it returns the name of the local variable. See debug.getlocal for more information about variable indices and names.

debug.sethook ([thread,] hook, mask [, count]) Sets the given function as a hook. The string mask and the number count describe when the hook will be called. The string mask may have any combination of the following characters, with the given meaning: 'c': the hook is called every time Lua calls a function; 'r': the hook is called every time Lua returns from a function; 'l': the hook is called every time Lua enters a new line of code. Moreover, with a count different from zero, the

debug.getuservalue (u) Returns the Lua value associated to u. If u is not a full userdata, returns nil.

debug.getupvalue (f, up) This function returns the name and the value of the upvalue with index up of the function f. The function returns nil if there is no upvalue with the given index. Variable names starting with '(' (open parenthesis) represent variables with no known names (variables from chunks saved without debug information).

debug.getregistry () Returns the registry table (see §4.5).

debug.getmetatable (value) Returns the metatable of the given value or nil if it does not have a metatable.

debug.getlocal ([thread,] f, local) This function returns the name and the value of the local variable with index local of the function at level f of the stack. This function accesses not only explicit local variables, but also parameters, temporaries, etc. The first parameter or local variable has index 1, and so on, following the order that they are declared in the code, counting only the variables that are active in the current scope of the function. Negative indices refer to vararg para

debug.getinfo ([thread,] f [, what]) Returns a table with information about a function. You can give the function directly or you can give a number as the value of f, which means the function running at level f of the call stack of the given thread: level 0 is the current function (getinfo itself); level 1 is the function that called getinfo (except for tail calls, which do not count on the stack); and so on. If f is a number larger than the number of active functions, then getinfo returns ni

debug.gethook ([thread]) Returns the current hook settings of the thread, as three values: the current hook function, the current hook mask, and the current hook count (as set by the debug.sethook function).