[all-commits] [llvm/llvm-project] f597ce: [ORC][Runtime] Enhancing ELF Platform with Push-Re...

[SahilPatidar via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f597ce03a6b2b7268e6a5c11cf7478c87b65b2bc
      https://github.com/llvm/llvm-project/commit/f597ce03a6b2b7268e6a5c11cf7478c87b65b2bc
  Author: SahilPatidar <patidarsahil2001 at gmail.com>
  Date:   2024-09-28 (Sat, 28 Sep 2024)

  Changed paths:
    M compiler-rt/lib/orc/elfnix_platform.cpp
    M compiler-rt/lib/orc/elfnix_platform.h
    M compiler-rt/lib/orc/macho_platform.cpp
    A compiler-rt/lib/orc/sections_tracker.h
    M llvm/include/llvm/ExecutionEngine/Orc/ELFNixPlatform.h
    M llvm/lib/ExecutionEngine/Orc/ELFNixPlatform.cpp

  Log Message:
  -----------
  [ORC][Runtime] Enhancing ELF Platform with Push-Request Model for Initializers (#102846)

With the help of @lhames, this PR introduces a push-request model to manage
initializers in the runtime state for each `JITDylib`, similar to how `MachO`
and `COFF` handle it. Previously, the ELF runtime lacked the ability to
register, deregister, or retain initializers, causing issues when re-running
`dlopen`. Initializers were erased after `rt_getInitializers` was used.

To address this, we introduce `__orc_rt_elfnix_register_init_sections` and
`__orc_rt_elfnix_register_jitdylib` (and corresponding deregister functions).
This model allows the runtime to request the push of initializers for the
`JITDylib`, with the platform handling this via a record method. Additionally,
we leverage `MachO`'s `RecordSectionsTracker` to store initializers, ensuring
only newly updated initializers are executed using `processNewSections`,
improving the runtime's efficiency and reliability.



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