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debug.traceback

Summary

Returns a string with a traceback of the stack call

Prototype

s = debug.traceback ( [thread,] message [, level])


Description

Returns a string with a traceback of the stack call. An optional message string is prepended to the beginning of the traceback message.


function f ()
  function g ()
  print (debug.traceback ("traceback in g"))
  end -- g
  g ()
end -- f

f ()

 -->
 
traceback in g
stack traceback:
        stdin:3: in function `g'
        stdin:6: in function `f'
        stdin:1: in main chunk
        [C]: ?


You can optionally supply a thread (coroutine) to be traced. This is useful if you get an error after calling coroutine.resume.

An optional level number tells at which level to start the tracekback - the default is 1 which is the function calling traceback.


See Also ...

Lua functions

debug.debug - Enters interactive debugging
debug.getfenv - Returns the environment of an object
debug.gethook - Returns the current hook settings
debug.getinfo - Returns a table with information about a function
debug.getlocal - Returns name and value of a local variable
debug.getmetatable - Returns the metatable of the given object
debug.getregistry - Returns the registry table
debug.getupvalue - Returns the name and value of an upvalue
debug.setfenv - Sets the environment of an object
debug.sethook - Sets a debug hook function
debug.setlocal - Sets the value of the local variable
debug.setmetatable - Sets the metatable for an object
debug.setupvalue - Sets an upvalue for a function

Topics

Lua base functions
Lua bc (big number) functions
Lua bit manipulation functions
Lua coroutine functions
Lua debug functions
Lua io functions
Lua math functions
Lua os functions
Lua package functions
Lua PCRE regular expression functions
Lua script extensions
Lua string functions
Lua syntax
Lua table functions
Lua utilities
Scripting
Scripting callbacks - plugins

(Help topic: lua=debug.traceback)

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