[all-commits] [llvm/llvm-project] 63bb4b: [ORC] Add ExecutionSession convenience methods to ...

[Lang Hames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 63bb4ba84a22279c1cdd4953f0c19269b23a9d32
      https://github.com/llvm/llvm-project/commit/63bb4ba84a22279c1cdd4953f0c19269b23a9d32
  Author: Lang Hames <lhames at gmail.com>
  Date:   2025-02-07 (Fri, 07 Feb 2025)

  Changed paths:
    M llvm/include/llvm/ExecutionEngine/Orc/Core.h

  Log Message:
  -----------
  [ORC] Add ExecutionSession convenience methods to access bootstrap values.

The getBootstrapMap, getBootstrapMapValue, getBootstrapSymbolsMap, and
getBootstrapSymbols methods forward to their respective counterparts in
ExecutorProcessControl, similar to the callWrapper functions.

These methods will be used to simplify an upcoming patch that accesses
the bootstrap values.


  Commit: e2eaf8ded78507100513a17e8193e2c4b094f8da
      https://github.com/llvm/llvm-project/commit/e2eaf8ded78507100513a17e8193e2c4b094f8da
  Author: Lang Hames <lhames at gmail.com>
  Date:   2025-02-07 (Fri, 07 Feb 2025)

  Changed paths:
    M llvm/include/llvm/ExecutionEngine/Orc/MachOPlatform.h
    A llvm/include/llvm/ExecutionEngine/Orc/TargetProcess/DefaultHostBootstrapValues.h
    M llvm/lib/ExecutionEngine/Orc/ExecutorProcessControl.cpp
    M llvm/lib/ExecutionEngine/Orc/LLJIT.cpp
    M llvm/lib/ExecutionEngine/Orc/MachOPlatform.cpp
    M llvm/lib/ExecutionEngine/Orc/TargetProcess/CMakeLists.txt
    A llvm/lib/ExecutionEngine/Orc/TargetProcess/DefaultHostBootstrapValues.cpp
    M llvm/lib/ExecutionEngine/Orc/TargetProcess/OrcRTBootstrap.cpp
    M llvm/tools/llvm-jitlink/llvm-jitlink-executor/llvm-jitlink-executor.cpp

  Log Message:
  -----------
  [ORC] Force eh-frame use for older Darwins on x86-64 in MachOPlatform, LLJIT.

The system libunwind on older Darwins does not support JIT registration of
compact-unwind. Since the CompactUnwindManager utility discards redundant
eh-frame FDEs by default we need to remove the compact-unwind section first
when targeting older libunwinds in order to preserve eh-frames.

While LLJIT was already doing this as of eae6d6d18bd, MachOPlatform was not.
This was causing buildbot failures in the ORC runtime (e.g. in
https://green.lab.llvm.org/job/llvm.org/job/clang-stage1-RA/3479/).

This patch updates both LLJIT and MachOPlatform to check a bootstrap value,
"darwin-use-ehframes-only", to determine whether to forcibly preserve
eh-frame sections. If this value is present and set to true then compact-unwind
sections will be discarded, causing eh-frames to be preserved. If the value is
absent or set to false then compact-unwind will be used and redundant FDEs in
eh-frames discarded (FDEs that are needed by the compact-unwind section are
always preserved).

rdar://143895614


Compare: https://github.com/llvm/llvm-project/compare/a1984ec5eab0...e2eaf8ded785

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