tree c7e7491992bcfa1f2ccda215b95f3d603890e59c
parent fdf05d1d34e1e7244acabc57c3f1f5823a260a13
author Sterling Augustine <saugustine@google.com> 1585606826 -0700
committer Copybara-Service <copybara-worker@google.com> 1598638591 -0700

Exit unwinding early when at the top of the stack and additional info won't be found.

Summary:
This patch follows libgcc's lead: When the return-address register is
zero, there won't be additional stack frames to examine, or gather
information about. Exit before spending time looking for something
known not to be found.

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D77099

GitOrigin-RevId: 71fbd6e40632f437049215904c28ad9d63cff4bc