Horton

Re: JIT compiling with LLVM v9.0

Pierre Ducroquet <pierre.ducroquet@people-doc.com>

View thread View on postgr.es
From: Pierre Ducroquet <pierre.ducroquet@people-doc.com>
To: pgsql-hackers@lists.postgresql.org
Cc: Andres Freund <andres@anarazel.de>
Date: 2018-01-29T10:20:38Z
Lists: pgsql-hackers 
On Monday, January 29, 2018 10:46:13 AM CET Andres Freund wrote:
> Hi,
> 
> On 2018-01-28 23:02:56 +0100, Pierre Ducroquet wrote:
> > I have fixed the build issues with LLVM 3.9 and 4.0. The LLVM
> > documentation is really lacking when it comes to porting from version x
> > to x+1.
> > The only really missing part I found is that in 3.9, GlobalValueSummary
> > has no flag showing if it's not EligibleToImport. I am not sure about the
> > consequences.
> 
> I think that'd not be too bad, it'd just lead to some small increase in
> overhead as more modules would be loaded.
> 
> > BTW, the makefile for src/backend/lib does not remove the llvmjit_types.bc
> > file when cleaning, and doesn't seem to install in the right folder.
> 
> Hm, both seems to be right here? Note that the llvmjit_types.bc file
> should *not* go into the bitcode/ directory, as it's about syncing types
> not inlining. I've added a comment to that effect.

The file was installed in lib/ while the code expected it in lib/postgresql. 
So there was something wrong here.
And deleting the file when cleaning is needed if at configure another llvm 
version is used. The file must be generated with a clang release that is not 
more recent than the llvm version linked to postgresql. Otherwise, the bitcode 
generated is not accepted by llvm.

Regards

 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".