Memory leaks (detected by Valgrind)

[Andrea Corallo]

Marc Nieper-Wißkirchen <marc.nieper+gnu@gmail.com> writes:

> Am Fr., 17. Dez. 2021 um 15:54 Uhr schrieb Andrea Corallo <mailto:andrea.corallo@arm.com>:Marc Nieper-Wißkirchen via Jit <mailto:jit@gcc.gnu.org> writes:
>
>> Am Fr., 17. Dez. 2021 um 11:52 Uhr schrieb Alex Coplan <mailto:Alex.Coplan@arm.com
>>>:
>>
>>> Hi,
>>>
>>> > -----Original Message-----
>>> > From: Jit <jit-bounces+alex.coplan=mailto:arm.com@gcc.gnu.org> On Behalf Of
>>> Marc
>>> > Nieper-Wißkirchen via Jit
>>> > Sent: 17 December 2021 10:29
>>> > To: Mark Wielaard <mailto:mark@klomp.org>
>>> > Cc: Marc Nieper-Wißkirchen <mailto:marc.nieper%2Bgnu@gmail.com>; mailto:jit@gcc.gnu.org
>>> > Subject: Re: Memory leaks (detected by Valgrind)
>>> >
>>> > Thanks!
>>> >
>>> > With `--enable-valgrind-annotations`, the "uses of uninitialized values"
>>> > have gone away, but a lot of small leaks are still present:
>>>
>>> Memory leaks with libgccjit are a known issue, see
>>> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63854
>>
>>
>> Oh, that the bug has been open so long and is still open is unfortunate as
>> a process using libgccjit usually lasts a lot longer than a single compiler
>> run by gcc.
>
> This weakens the usefulness of libgccjit considerably, doesn't it?

Agree, IMO it does.

> If I have to start a new process to invoke it, only a bit is won
> compared to writing out C and using the C frontend of GCC through
> exec, no?

Correct.  We leave with that also because we use subprocesses to obtain
parallelism (we have no posix thread exposure in Elisp) *and* in any
case we would not be able to backport the hypothetical fix to old
distros.

> How to you pass back the result of the compilation from the
> subprocess to the original process in Emacs?

For us it's easy as the output of the compilation is a file (we'll reuse
it in different sessions).

> PS How difficult is it to fix the memory leaks?

Good question.

  Andrea
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