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 nil.
The returned table can contain all the fields returned by lua_getinfo
, with the string what
describing which fields to fill in. The default for what
is to get all information available, except the table of valid lines. If present, the option 'f
' adds a field named func
with the function itself. If present, the option 'L
' adds a field named activelines
with the table of valid lines.
For instance, the expression debug.getinfo(1,"n").name
returns a name for the current function, if a reasonable name can be found, and the expression debug.getinfo(print)
returns a table with all available information about the print
function.
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