Horton

Re: JIT compiling with LLVM v9.0

Pierre Ducroquet <p.psql@pinaraf.info>

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From: Pierre Ducroquet <p.psql@pinaraf.info>
To: pgsql-hackers@lists.postgresql.org
Date: 2018-01-25T09:00:14Z
Lists: pgsql-hackers 
On Thursday, January 25, 2018 7:38:16 AM CET Andres Freund wrote:
> Hi,
> 
> On 2018-01-24 22:33:30 -0800, Jeff Davis wrote:
> > On Wed, Jan 24, 2018 at 1:35 PM, Pierre Ducroquet <p.psql@pinaraf.info> 
wrote:
> > > In LLVM 5.0, it looks like DebugInfo.h is not available in llvm-c, only
> > > as a C ++ API in llvm/IR/DebugInfo.h.
> > 
> > The LLVM APIs don't seem to be very stable; won't there just be a
> > continuous stream of similar issues?
> 
> There'll be some of that yes. But the entire difference between 5 and
> what will be 6 was not including one header, and not calling one unneded
> function. That doesn't seem like a crazy amount of adaption that needs
> to be done.  From a quick look about porting to 4, it'll be a bit, but
> not much more effort.

I don't know when this would be released, but the minimal supported LLVM 
version will have a strong influence on the availability of that feature. If 
today this JIT compiling was released with only LLVM 5/6 support, it would be 
unusable for most Debian users (llvm-5 is only available in sid). Even llvm 4 
is not available in latest stable.
I'm already trying to build with llvm-4 and I'm going to try further with llvm 
3.9 (Debian Stretch doesn't have a more recent than this one, and I won't have 
something better to play with my data), I'll keep you informed. For sport, I 
may also try llvm 3.5 (for Debian Jessie).

 Pierre

Commits

  1. Improve JIT docs.

  2. Add documentation for the JIT feature.

  3. Add EXPLAIN support for JIT.

  4. Add inlining support to LLVM JIT provider.

  5. JIT tuple deforming in LLVM JIT provider.

  6. Add FIELDNO_* macro designating offset into structs required for JIT.

  7. Add expression compilation support to LLVM JIT provider.

  8. Expand list of synchronized types and functions in LLVM JIT provider.

  9. Add helpers for emitting LLVM IR.

  10. Basic planner and executor integration for JIT.

  11. Debugging and profiling support for LLVM JIT provider.

  12. Support for optimizing and emitting code in LLVM JIT provider.

  13. Add file containing extensions of the LLVM C API.

  14. Basic JIT provider and error handling infrastructure.

  15. Add configure infrastructure (--with-llvm) to enable LLVM support.

  16. Add C++ support to configure.

  17. Add PGAC_PROG_VARCC_VARFLAGS_OPT autoconf macro.

  18. Fix VM buffer pin management in heap_lock_updated_tuple_rec().

  19. Allow tupleslots to have a fixed tupledesc, use in executor nodes.

  20. Expression evaluation based aggregate transition invocation.

  21. Perform slot validity checks in a separate pass over expression.

  22. Rely on executor utils to build targetlist for DML RETURNING.

  23. Refer to OS X as "macOS", except for the port name which is still "darwin".