RegisterContextUnwind::SavedLocationForRegister is around 450 lines that
first find an abstract register location (e.g. "CFA-8") for a register
by looking in the UnwindPlans. Then it evaluates the abstract register
location to create a concrete register location (e.g. "stored at address
0x...", "live in register at frame 0"). There are some complicated cases
in the first half of the method to handle return address register
architectures correctly, in particular.

Looking at the two halves, they're both exactly 226 lines long and
there's little involvement between them except for passing an abstract
register location along.

(there were some parts in the "abstract register location" code that
would set the concrete register location, unnecessarily)

It's also a complex enough method that there are some bits of code that
aren't actually doing anything at this point.

This patch adds a RegisterContextUnwind::GetAbstractRegisterLocation
method, which does the first half, and has a clearly defined return
values.

The code to convert an AbstractRegisterLocation into a
ConcreteRegisterLocation remains in SavedLocationForRegister.

It's a bit of a tricky patch to visually inspect, despite it not
changing functionality, the reorganizations and rewrites make the diff
unreadable. Nearly all the real changes are in the "find the abstract
register location" first half of the method. I think reading the new
code in its new form is the easiest way to inspect this PR. With a
defined interface between the two of what is expected, it's pretty easy
to look at the code and reason about whether it is written correctly.

(whereas before, that was very difficult, for me at least.)

---------

Co-authored-by: Pavel Labath <pavel@labath.sk>

This converts a default constructor's member initializers into C++11
default member initializers. This patch was automatically generated with
clang-tidy and the modernize-use-default-member-init check.

$ run-clang-tidy.py -header-filter='lldb' -checks='-*,modernize-use-default-member-init' -fix

This is a mass-refactoring patch and this commit will be added to
.git-blame-ignore-revs.

Differential revision: https://reviews.llvm.org/D103483

Summary:
A *.cpp file header in LLDB (and in LLDB) should like this:
```
//===-- TestUtilities.cpp -------------------------------------------------===//
```
However in LLDB most of our source files have arbitrary changes to this format and
these changes are spreading through LLDB as folks usually just use the existing
source files as templates for their new files (most notably the unnecessary
editor language indicator `-*- C++ -*-` is spreading and in every review
someone is pointing out that this is wrong, resulting in people pointing out that this
is done in the same way in other files).

This patch removes most of these inconsistencies including the editor language indicators,
all the different missing/additional '-' characters, files that center the file name, missing
trailing `===//` (mostly caused by clang-format breaking the line).

Reviewers: aprantl, espindola, jfb, shafik, JDevlieghere

Reviewed By: JDevlieghere

Subscribers: dexonsmith, wuzish, emaste, sdardis, nemanjai, kbarton, MaskRay, atanasyan, arphaman, jfb, abidh, jsji, JDevlieghere, usaxena95, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D73258

to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636

This patch simplifies boolean expressions acorss LLDB. It was generated
using clang-tidy with the following command:

run-clang-tidy.py -checks='-*,readability-simplify-boolean-expr' -format -fix $PWD

Differential revision: https://reviews.llvm.org/D55584

llvm-svn: 349215

With this patch, the only dependency left is from Utility
to Host.  After this is broken, Utility will finally be
standalone.

Differential Revision: https://reviews.llvm.org/D29909

llvm-svn: 295088