llvm-project.git/llvm/lib/ExecutionEngine/Orc/TargetProcess/DefaultHostBootstrapValues.cpp, branch users/nico/python-2 Unnamed repository; edit this file 'description' to name the repository. [ORC] Drop EHFrameRegistrar, register eh-frames with AllocActions (#130719) 2025-03-11T23:02:30+00:00 Lang Hames lhames@gmail.com 2025-03-11T23:02:30+00:00 76d5a79bed007769745d44a5e298c09614cad423 This simplifies resource management, and should improve performance for most use cases. 
This simplifies resource management, and should improve performance for most use
cases.
 [ORC] Force eh-frame use for older Darwins on x86-64 in MachOPlatform, LLJIT. 2025-02-07T06:04:05+00:00 Lang Hames lhames@gmail.com 2025-02-07T05:51:52+00:00 e2eaf8ded78507100513a17e8193e2c4b094f8da 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 
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