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- Subject: Lua debug hook events
- From: Tim Gogolin <tgogolin@...>
- Date: Tue, 10 Aug 2004 13:48:20 -0500
Oh gurus of the Lua Virtual Machine and debug hook system...
Some test code for me to understand the lua debugging hooks:
LINE 1: _G.aaa = 100
LINE 2: function foo()
LINE 3: _G.aaa = _G.aaa + 1
LINE 4: halt()
LINE 5: _G.aaa = _G.aaa + 1
LINE 6: _G.aaa = _G.aaa + 1
LINE 7: _G.aaa = _G.aaa + 1
LINE 8: end
In the halt() function (implemented in C), I set the hook mask to
LUA_MASKCALL | LUA_MASKRET | LUA_MASKLINE
and I begin to printf all the events I get.
I get a HOOKRET from inside halt(), with the calling function being
foo(), LINE 4.
I'm happy so far.
The very next event I get is HOOKLINE with the current function being
foo(), LINE 6. The value of _G.aaa is 102 (i.e. LINE 5 executed, but
not LINE 6 yet)
I was expecting to get a HOOKLINE on LINE 5, with _G.aaa being 101
(since we wouldn't have yet executed LINE 5)
Is my expectation incorrect? Why does the VM not send me the HOOKLINE
immediately after returning from a function? (This is executed on Lua
The lua 5 ref manual says that the line hook is executed when the
interpreter is about to start the execution of a new line of code...
Shouldn't I have gotten a hook for LINE 5?
Thanks for any pointers or additional references!
-- Tim Gogolin