lazarus at kluug.net
Mon Feb 19 12:17:19 CET 2018
On 19.02.2018 11:14, Sven Barth via fpc-devel wrote:
> Am 19.02.2018 11:01 schrieb "Ondrej Pokorny" <lazarus at kluug.net
> <mailto:lazarus at kluug.net>>:
> I agree with Simon here. It's a similar scenario like heaptrc. Why
> not to add a compiler parameter to include profiling info? That
> would be just great.
> It's not the same scenario as heaptrc is entirely working in the RTL
> without any compiler extension (aside from the -gh parameter).
First of all - if you read my sentence again I said it is a */similar/*
scenario and not the */same/* scenario.
BUT: to be completely exact a small compiler extension comes with -gh as
well and that you cannot achieve with the RTL - if
http://wiki.freepascal.org/heaptrc is not wrong: /Note: Do not add the
heaptrc unit manually. The heaptrc unit needs to be loaded before
lineinfo and only the compiler can do that./
So yes, -gh injects the heaptrc unit in front of lineinfo and the
profiling compiler parameter injects profiling code into every compiled
procedure/method. Don't tell me you don't see any similarities here :)
And yes, even the word "same" can be seen as valid here, if you like
word games :)
Second: FPProfiler works already now entirely in the RTL without any
compiler extension. Your above statement just doesn't make sense.
> Profiling code however would require extensions to the compiler
> whereby it would also need to handle exceptions correctly and such things.
Yes, I am again absolutely aware of this and I still believe it's
possible and probably even not that hard to achieve. You just need to
inject a try-finally block (= "handles exceptions correctly") around
every procedure/function block:
// <<< real code here
Of course EnterProfiling and LeaveProfiling must be thread safe (every
thread to be profiled separately) - and they even can be a part of the
RTL, the same as heaptrc code is. EnterProfiling and LeaveProfiling must
eat all intern exceptions - this is perfectly doable in the RTL.
All in all, in my eyes absolutely doable and a great and valid compiler
extension. And again - very very similar scenario to heaptrc, if you
don't like the word "same".
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the fpc-devel