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The `DebugObjectManagerPlugin` implements debugger support for ELF
platforms with the GDB JIT Interface. It emits a separate debug object
allocation in addition to the LinkGraph's own allocation. This used to
happen in the plugin's `notifyEmitted()` callback, i.e. after the
LinkGraph's allocation was finalized. In the meantime, it had to block
finalization of the corresponding materialization unit to make sure that
the debugger can register the object before the code runs.
This patch switches the plugin to use an allocation action instead. We
can remove the `notifyEmitted()` hook and implement all steps as JITLink
passes.
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This simplifies resource management, and should improve performance for most use
cases.
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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
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