[all-commits] [llvm/llvm-project] f178a0: [libunwind] Fix unwind_leaffunction test
PiJoules via All-commits
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Fri Dec 3 11:21:47 PST 2021
Author: Leonard Chan <leonardchan at google.com>
Date: 2021-12-03 (Fri, 03 Dec 2021)
[libunwind] Fix unwind_leaffunction test
It's possible for this test not to pass if the libc used does not provide
unwind info for raise. We can replace it with __builtin_cast, which can lead
to a SIGTRAP on x86_64 and a SIGILL on aarch64.
Using this alternative, a nop is needed before the __builtin_cast. This is
because libunwind incorrectly decrements pc, which can cause pc to jump into
the previous function and use the incorrect FDE.
Differential Revision: https://reviews.llvm.org/D114818
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