Difference between revisions of "Debug.sethook"
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When the hook is called, its first parameter is a string describing the event that has triggered its call: "call", "return" (or "tail return", when simulating a return from a tail call), "line", and "count". For line events, the hook also gets the new line number as its second parameter. Inside a hook, you can call getinfo with level 2 to get more information about the running function (level 0 is the getinfo function, and level 1 is the hook function), unless the event is "tail return". In this case, Lua is only simulating the return, and a call to getinfo will return invalid data. | When the hook is called, its first parameter is a string describing the event that has triggered its call: "call", "return" (or "tail return", when simulating a return from a tail call), "line", and "count". For line events, the hook also gets the new line number as its second parameter. Inside a hook, you can call getinfo with level 2 to get more information about the running function (level 0 is the getinfo function, and level 1 is the hook function), unless the event is "tail return". In this case, Lua is only simulating the return, and a call to getinfo will return invalid data. | ||
<source lang="lua"> | <source lang="lua"> | ||
| − | + | debug.sethook(hook,mask,count) | |
</source> | </source> | ||
| − | '''hook | + | '''hook''': (function) function to be executed as hook ''''''<br/> |
| − | '''mask | + | '''mask''': (string) mask of the hook "c", "r" or "l" ''''''<br/> |
| − | '''count | + | '''count''': (number) hook count '''optional'''<br/> |
Revision as of 10:17, 23 August 2018
Available since: Gideros 2011.6
Description
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 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.
With a count different from zero, the hook is called after every count instructions.
When called without arguments, debug.sethook turns off the hook.
When the hook is called, its first parameter is a string describing the event that has triggered its call: "call", "return" (or "tail return", when simulating a return from a tail call), "line", and "count". For line events, the hook also gets the new line number as its second parameter. Inside a hook, you can call getinfo with level 2 to get more information about the running function (level 0 is the getinfo function, and level 1 is the hook function), unless the event is "tail return". In this case, Lua is only simulating the return, and a call to getinfo will return invalid data.
debug.sethook(hook,mask,count)
'hook: (function) function to be executed as hook '
'mask: (string) mask of the hook "c", "r" or "l" '
count: (number) hook count optional
