[LLVMdev] memory leaks at compiler termination

[Justin Holewinski]

On Sat, Mar 2, 2013 at 12:56 PM, Alexander Potapenko <glider at google.com>wrote:

>
> On Mar 2, 2013 3:18 AM, "reed kotler" <rkotler at mips.com> wrote:
> >
> > Does LLVM try and make sure that all memory is freed before compiler
> exit?
> >
> > For example, It seems like the ARM constant pool code that I'm reading
> will leave a lot of un-deallocated memory.
> >
> > Maybe I'm missing something here.
> Is it that necessary to have the compiler free everything?
> It usually makes sense to ensure all the allocated memory is still
> reachable (i.e. there are no uncontrollable leaks), but if there are
> pointers to that memory it should be fine to leave that memory unfreed to
> speed up the process shutdown.


It can be very important if you're using llvm/clang as a library instead of
a stand-alone process.  If a compilation does not free all of its memory
and is repeatedly invoked, this can lead to increasing memory usage.  I'm
not saying this is the case for the ARM constant pool (I don't know).

I've recently ran into an issue where the PassRegistry is not completely
cleaned up on exit.


>
> > Reed
> >
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-- 

Thanks,

Justin Holewinski
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