tree d59d96700552a049fd007209b8fe2f1bbb40f088
parent 019d7694df91d75322e3c19ebc2e1aa7d3120e02
author Pavel Labath <pavel@labath.sk> 1747214996 +0200
committer GitHub <noreply@github.com> 1747214996 +0200
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[lldb] Merge/unify ABI-provided AArch64 unwind plans (#139545)

The macos and sysv ABIs return functionally equivalent unwind plans, so
they can be implemented in the base AArch64 class. The only difference
between them was that the macos plan provided a "pc=lr" rule whereas the
sysv plan called SetReturnAddressRegister (which causes the unwind
machinery to act as if that rule was present). This difference was
enough to cause `CompareUnwindPlansForIdenticalInitialPCLocation` to
return a different value and break the (temporarily reverted)
TestUnwindFramelessFaulted test.

While merging the two functions, I couldn't stop myself from simplifying
them to use the generic register number schemes -- which exposed another
bug in CompareUnwindPlansForIdenticalInitialPCLocation, namely that it
was expecting all unwind plans to use the LLDB numbering scheme. This
patch fixes that as well.