llvm dev - Mar 2020 - ORC JIT Weekly #8: Basic OrcV2 C Bindings, MachO and COFF improvements.

Hi All,

I've added a very basic set of C bindings for OrcV2 in 633ea07200e, with an
example in llvm/example/OrcV2Examples/BasicOrcV2CBindings. Development of
the C APIs is being tracked by http://llvm.org/PR31103 -- if you're
interested in C APIs for OrcV2 please get involved. I would especially
appreciate feedback and patches from C API users: I don't have a use case
for the C APIs myself, so I'm just guessing as to what you need/want most
from these APIs.

Other notes from this week:

The JITEventListeners support patch in https://reviews.llvm.org/D75838 will
be (re)committed along with some example code as soon as I work out the
kinks in the object buffer ownership -- Hopefully Monday or Tuesday this
week.

LLJIT now enables exception handling for MachO by default (7266a8bfeb8).

RuntimeDyldCOFF will now build stubs for dllimports (337e131ca7de).

JITLink now correctly scopes MachO linker-private symbols (b64afadf306,
9c9eb60b4b), and reads the 'weak' flag from the correct nlist field
(c700e0317c2).

Stackmaps and DWARF can now be used in the same file without triggering an
assertion (3f981cdde90f).

-- Lang.
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Hi,

On 2020-03-15 22:58:10 -0700, Lang Hames wrote:
> I've added a very basic set of C bindings for OrcV2 in 633ea07200e,
with an
> example in llvm/example/OrcV2Examples/BasicOrcV2CBindings. Development of
> the C APIs is being tracked by http://llvm.org/PR31103 -- if you're
> interested in C APIs for OrcV2 please get involved. I would especially
> appreciate feedback and patches from C API users: I don't have a use
case
> for the C APIs myself, so I'm just guessing as to what you need/want
most
> from these APIs.
Nice! I think the best I can do to validate the new API is to port
postgres to it - unless you have a different wish?

> Other notes from this week:
> 
> The JITEventListeners support patch in https://reviews.llvm.org/D75838 will
> be (re)committed along with some example code as soon as I work out the
> kinks in the object buffer ownership -- Hopefully Monday or Tuesday this
> week.
Cool! I'll verify that I can get a perf profile with the perf listener
using it.

Greetings,

Andres Freund

Hi Andres,

Nice! I think the best I can do to validate the new API is to
port
> postgres to it - unless you have a different wish?

That sounds great to me!

Cool! I'll verify that I can get a perf profile with the perf
listener
> using it.

If you're registering event listeners via the C API that will be a nice
first step: We'll need to add new functions to the bare-bones C API to
register and deregister event listeners.

-- Lang.

On Mon, Mar 16, 2020 at 11:48 AM Andres Freund <andres at anarazel.de>
wrote:
> Hi,
>
> On 2020-03-15 22:58:10 -0700, Lang Hames wrote:
> > I've added a very basic set of C bindings for OrcV2 in
633ea07200e, with
> an
> > example in llvm/example/OrcV2Examples/BasicOrcV2CBindings. Development
of
> > the C APIs is being tracked by http://llvm.org/PR31103 -- if
you're
> > interested in C APIs for OrcV2 please get involved. I would especially
> > appreciate feedback and patches from C API users: I don't have a
use case
> > for the C APIs myself, so I'm just guessing as to what you
need/want most
> > from these APIs.
>
> Nice! I think the best I can do to validate the new API is to port
> postgres to it - unless you have a different wish?
>
>
> > Other notes from this week:
> >
> > The JITEventListeners support patch in https://reviews.llvm.org/D75838
> will
> > be (re)committed along with some example code as soon as I work out
the
> > kinks in the object buffer ownership -- Hopefully Monday or Tuesday
this
> > week.
>
> Cool! I'll verify that I can get a perf profile with the perf listener
> using it.
>
> Greetings,
>
> Andres Freund
>
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Hi All,

The JITEventListeners support patch in https://reviews.llvm.org/D75838
will
> be (re)committed along with some example code as soon as I work out the
> kinks in the object buffer ownership -- Hopefully Monday or Tuesday this
> week.

Testing on Linux also threw up some thread safety issues related to this
that I need to track down, so the new ETA for D75838 is later this week.

-- Lang.

On Sun, Mar 15, 2020 at 10:58 PM Lang Hames <lhames at gmail.com> wrote:
> Hi All,
>
> I've added a very basic set of C bindings for OrcV2 in 633ea07200e,
with
> an example in llvm/example/OrcV2Examples/BasicOrcV2CBindings. Development
> of the C APIs is being tracked by http://llvm.org/PR31103 -- if you're
> interested in C APIs for OrcV2 please get involved. I would especially
> appreciate feedback and patches from C API users: I don't have a use
case
> for the C APIs myself, so I'm just guessing as to what you need/want
most
> from these APIs.
>
> Other notes from this week:
>
> The JITEventListeners support patch in https://reviews.llvm.org/D75838
> will be (re)committed along with some example code as soon as I work out
> the kinks in the object buffer ownership -- Hopefully Monday or Tuesday
> this week.
>
> LLJIT now enables exception handling for MachO by default (7266a8bfeb8).
>
> RuntimeDyldCOFF will now build stubs for dllimports (337e131ca7de).
>
> JITLink now correctly scopes MachO linker-private symbols (b64afadf306,
> 9c9eb60b4b), and reads the 'weak' flag from the correct nlist field
> (c700e0317c2).
>
> Stackmaps and DWARF can now be used in the same file without triggering an
> assertion (3f981cdde90f).
>
> -- Lang.
>
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Hi All,

The JITEventListener support (https://reviews.llvm.org/D75838) has been
re-enabled with fixes in 39253a50f0f.

Andres -- Let me know if/when you want to test this out and add C API for
it.

Regards,
Lang.

On Tue, Mar 17, 2020 at 4:54 PM Lang Hames <lhames at gmail.com> wrote:
> Hi All,
>
> The JITEventListeners support patch in https://reviews.llvm.org/D75838
>> will be (re)committed along with some example code as soon as I work
out
>> the kinks in the object buffer ownership -- Hopefully Monday or Tuesday
>> this week.
>
>
> Testing on Linux also threw up some thread safety issues related to this
> that I need to track down, so the new ETA for D75838 is later this week.
>
> -- Lang.
>
> On Sun, Mar 15, 2020 at 10:58 PM Lang Hames <lhames at gmail.com>
wrote:
>
>> Hi All,
>>
>> I've added a very basic set of C bindings for OrcV2 in 633ea07200e,
with
>> an example in llvm/example/OrcV2Examples/BasicOrcV2CBindings.
Development
>> of the C APIs is being tracked by http://llvm.org/PR31103 -- if
you're
>> interested in C APIs for OrcV2 please get involved. I would especially
>> appreciate feedback and patches from C API users: I don't have a
use case
>> for the C APIs myself, so I'm just guessing as to what you
need/want most
>> from these APIs.
>>
>> Other notes from this week:
>>
>> The JITEventListeners support patch in https://reviews.llvm.org/D75838
>> will be (re)committed along with some example code as soon as I work
out
>> the kinks in the object buffer ownership -- Hopefully Monday or Tuesday
>> this week.
>>
>> LLJIT now enables exception handling for MachO by default
(7266a8bfeb8).
>>
>> RuntimeDyldCOFF will now build stubs for dllimports (337e131ca7de).
>>
>> JITLink now correctly scopes MachO linker-private symbols (b64afadf306,
>> 9c9eb60b4b), and reads the 'weak' flag from the correct nlist
field
>> (c700e0317c2).
>>
>> Stackmaps and DWARF can now be used in the same file without triggering
>> an assertion (3f981cdde90f).
>>
>> -- Lang.
>>
>
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