[cfe-dev] libclang cancellation of long running tasks

[Manuel Klimek]

On Tue Jan 13 2015 at 12:46:57 PM David Chisnall <
David.Chisnall at cl.cam.ac.uk> wrote:

> On 13 Jan 2015, at 11:17, Manuel Klimek <klimek at google.com> wrote:
> >
> > On Tue Jan 13 2015 at 12:13:53 PM John Sully <john at csquare.ca> wrote:
> > > The problem is that most of the time is spent throughout various
> functions of Sema in clang, so the only way I see is to have every function
> in Sema check for abortion, which sounds like it would horribly clutter the
> code...
> >
> > I don't think it needs to be that extreme.  Once every 100ms would be
> sufficient for my purposes which would drastically reduce the number of
> checks needed.  My own profiles are also showing a fair amount of time in
> the Lex code as well.  I'm still learning the code but I suspect it would
> be feasible to check in-between major phases.
> >
> > I suspect it won't, but feel free to give it a try - for really long TUs
> we see all of the time spent in Sema trying to parse C++, and it's
> basically a flat profile.
>
> A check in Sema at the start of processing each FunctionDecl might be
> enough.  Even long functions with a lot of template instantiations probably
> don't take more than 100ms in most code.  Unless you're trying to use
> libclang with the raytracer written in C++ templates or something equally
> silly (boost, perhaps)...
>

That would definitely help already. Great idea.


>
> David
>
>
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