Re: Re: cannot receive LUA_HOOKTAILRET event of tail callafterdebug.sethook

On 6 June 2016 at 00:08, cx0cx2001 <cx0cx2001@aliyun.com> wrote:

> The lua version used is lua5.1.4

> 2016-06-05

> ________________________________

> cx0cx2001

> ________________________________

> 发件人： cx0cx2001

> 发送时间： 2016-06-05 22:04:41

> 收件人： lua-l

> 抄送：

> 主题： cannot receive LUA_HOOKTAILRET event of tail call afterdebug.sethook

> <code>

> function hook(event)

> print(event);

> end

> function test1()

> end

> function test()

> return test1();

> end

> debug.sethook(hook, "cr");

> test();

> </code>

> The output of the above code is following:

> call

> return

> The count of return hook is not same as the count of call hook.

> I found that the return or tailretun event is missing when there is tail

> call.

> Because of this bug, it's impossible to collect the function's execute

> time(between call hook and return hook) of lua code.

> 2016-06-05

> ________________________________

> cx0cx2001

Please do not send HTML formatted email; and please bottom post.

In Lua 5.1.5 I get:

return

call

return

tail return

return

In Lua 5.3.2 I get:

return

call

tail call

return

The first `return` in both outputs is debug.sethook itself returning,

the final `return` in both outputs is the test itself finishing. These

can be ignored for the sake of your example.

In 5.1 if you count +1 for each "call", and -1 for each "return" or

"tail return" it is balanced:

call --> 1

call --> 2

return --> 1

tail return --> 0