Horton

Re: JIT compiling with LLVM v10.0

Andres Freund <andres@anarazel.de>

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From: Andres Freund <andres@anarazel.de>
To: pgsql-hackers@postgresql.org
Date: 2018-02-07T14:54:05Z
Lists: pgsql-hackers 
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.


I've also rebased onto a recent master version.

postgres[21915][1]=# SELECT pg_llvmjit_available();
┌──────────────────────┐
│ pg_llvmjit_available │
├──────────────────────┤
│ t                    │
└──────────────────────┘
(1 row)

make -C src/backend/jit/llvm/ uninstall
postgres[21915][1]=# \c
You are now connected to database "postgres" as user "andres".
postgres[21922][1]=# SELECT pg_llvmjit_available();
┌──────────────────────┐
│ pg_llvmjit_available │
├──────────────────────┤
│ f                    │
└──────────────────────┘
(1 row)

Yeha ;)

Greetings,

Andres Freund

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".