[all-commits] [llvm/llvm-project] 08c5f1: [ORC] Add absoluteSymbolsLinkGraph to expose absol...

[Ben Langmuir via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 08c5f1fede969e687e77d0508008682e5f188f49
      https://github.com/llvm/llvm-project/commit/08c5f1fede969e687e77d0508008682e5f188f49
  Author: Ben Langmuir <blangmuir at apple.com>
  Date:   2024-01-05 (Fri, 05 Jan 2024)

  Changed paths:
    M bolt/lib/Rewrite/JITLinkLinker.cpp
    M llvm/include/llvm/ExecutionEngine/JITLink/JITLink.h
    M llvm/include/llvm/ExecutionEngine/Orc/EPCDynamicLibrarySearchGenerator.h
    M llvm/include/llvm/ExecutionEngine/Orc/ExecutionUtils.h
    M llvm/lib/ExecutionEngine/JITLink/JITLink.cpp
    M llvm/lib/ExecutionEngine/JITLink/JITLinkGeneric.cpp
    M llvm/lib/ExecutionEngine/Orc/EPCDynamicLibrarySearchGenerator.cpp
    M llvm/lib/ExecutionEngine/Orc/ExecutionUtils.cpp
    M llvm/lib/ExecutionEngine/Orc/MachOPlatform.cpp
    M llvm/lib/ExecutionEngine/Orc/ObjectLinkingLayer.cpp
    M llvm/unittests/ExecutionEngine/Orc/ObjectLinkingLayerTest.cpp

  Log Message:
  -----------
  [ORC] Add absoluteSymbolsLinkGraph to expose absolute symbols to platform (#77008)

Adds a function to create a LinkGraph of absolute symbols, and a
callback in dynamic library search generators to enable using it to
expose its symbols to the platform/orc runtime. This allows e.g. using
__orc_rt_run_program to run a precompiled function that was found via
dlsym. Ideally we would use this in llvm-jitlink's own search generator,
but it will require more work to align with the Process/Platform
JITDylib split, so not handled here.

As part of this change we need to handle LinkGraphs that only have
absolute symbols.