Pavel Labath 96e600fcf5 Add a NativeProcessProtocol Factory class ...

Summary:
This replaces the static functions used for creating
NativeProcessProtocol instances with a factory pattern, and modernizes
the interface of the new class in the process -- I use llvm::Expected
instead of the Status+value combo. I also move some of the common code
(like the Delegate registration into the base class). The new
arrangement has multiple benefits:
- it removes the NativeProcess*** dependency from Process/gdb-remote
  (which for example means that liblldb no longer pulls in this code).
- it enables unit testing of the GDBRemoteCommunicationServerLLGS class
  (by providing a mock Native Process).
- serves as another example on how to use the llvm::Expected class (I
  couldn't get rid of the Initialize-type functions completely here
  because of the use of shared_from_this, but that's the next thing on
  my list here)

Tests still pass on Linux and I've made sure NetBSD compiles after this.

Reviewers: zturner, eugene, krytarowski

Subscribers: srhines, lldb-commits, mgorny

Differential Revision: https://reviews.llvm.org/D33778

llvm-svn: 307390

2017-07-07 11:02:19 +00:00

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