tree 3f9fed0831c8fcc6c1f91d4cdf6c1d2754ba14d1
parent cac8808a25362ae658f9245c02652cd44b8d43aa
author Scott Graham <scottmg@chromium.org> 1478037910 -0700
committer Mark Mentovai <mark@chromium.org> 1479240656 -0500

Basic handling of CIE version 4 in dwarf reading

CIE looks like it's been emitted by clang since ~May 2015 [1]. This
means that we didn't have any CFI because this parse aborted, which
meant that all stack walks reverted to stack scanning. Allow expected
values for address size and segment descriptor size through so that
dump_syms can generate at least somewhat reasonable data.

[1]: http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20150518/277292.html

R=mark@chromium.org
BUG=chromium:627529

Change-Id: I6dc92f51c4afd25c2adff92c09ccb8bb03bf9112
Reviewed-on: https://chromium-review.googlesource.com/406012
Reviewed-by: Mark Mentovai <mark@chromium.org>
Cr-Mirrored-From: https://chromium.googlesource.com/breakpad/breakpad
Cr-Mirrored-Commit: bbebd8d5e7d61666c3a2dae82867bb7b5aeda639