Horton

Re: JIT compiling with LLVM v10.0

Pierre Ducroquet <p.psql@pinaraf.info>

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From: Pierre Ducroquet <p.psql@pinaraf.info>
To: pgsql-hackers@lists.postgresql.org
Cc: Andres Freund <andres@anarazel.de>, pgsql-hackers@postgresql.org
Date: 2018-02-07T19:35:12Z
Lists: pgsql-hackers

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On Wednesday, February 7, 2018 3:54:05 PM CET Andres Freund wrote:
> Hi,
> 
> I've pushed v10.0. The big (and pretty painful to make) change is that
> now all the LLVM specific code lives in src/backend/jit/llvm, which is
> built as a shared library which is loaded on demand.
> 
> The layout is now as follows:
> 
> src/backend/jit/jit.c:
>     Part of JITing always linked into the server. Supports loading the
>     LLVM using JIT library.
> 
> src/backend/jit/llvm/
> Infrastructure:
>  llvmjit.c:
>     General code generation and optimization infrastructure
>  llvmjit_error.cpp, llvmjit_wrap.cpp:
>     Error / backward compat wrappers
>  llvmjit_inline.cpp:
>     Cross module inlining support
> Code-Gen:
>   llvmjit_expr.c
>     Expression compilation
>   llvmjit_deform.c
>     Deform compilation
> 
> I generally like how this shaped out. There's a good amount of followup
> cleanup needed, but I'd appreciate some early feedback.

Hi

I also find it more readable and it looks cleaner, insane guys could be able 
to write their own JIT engines for PostgreSQL by patching a single file :) 
Since it's now in its own .so file, does it still make as much sense using 
mostly the LLVM C API ?
I'll really look in the jit code itself later, right now I've just rebased my 
previous patches and did a quick check that everything worked for LLVM4 and 
3.9.
I included a small addition to the gitignore file, I'm surprised you were not 
bothered by the various .bc files generated.

Anyway, great work, and I look forward exploring the code :)

 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".