tree d885e89285e12af8d6de0442aea816a2e8ad7372
parent 5e2d9b0c19cc6f718e60e4208717df3ad409fc14
author Jason Molenda <jason@molenda.com> 1613634243 -0800
committer Copybara-Service <copybara-worker@google.com> 1613726142 -0800

Add a new Row setting to mark all un-declared regs as Undefined

Add a new state for UnwindPlan::Row which indicates that any
register not listed is not defined, and should not be found in
stack frames newer than this one and passed up the stack.  Mostly
intended for use with architectural default unwind plans that are
used for jitted stack frames, where we have no unwind information
or start address.  lldb has no way to tell if registers were
spilled in the jitted frame & overwritten, so passing register
values up the stack is not safe to show the user.

Architectural default unwind plans are also used as a fast unwind
plan on x86_64 in particular, and are used as the fallback unwind
plans when lldb thinks it may be able to work around a problem
which causes the unwinder to stop walking the stack early.

For fast unwind plans, when we don't find a register location in
the arch default unwind plan, we fall back to computing & using
the full unwind plan. One small part of this patch is to know that
a register marked as Undefined in the fast unwind plan is a special
case, and we should continue on to the full unwind plan to find what
the real unwind rule is for this register.

Differential Revision: https://reviews.llvm.org/D96829
<rdar://problem/70398009>

GitOrigin-RevId: fcdef15d77bde8a200cd28242077cd2496f138a4