src/contrib/llvm/tools/lldb/source/Plugins/Process/FreeBSD, branch main

Move all sources from the llvm project into contrib/llvm-project.

2019-12-20T19:53:05+00:00

This uses the new layout of the upstream repository, which was recently
migrated to GitHub, and converted into a "monorepo".  That is, most of
the earlier separate sub-projects with their own branches and tags were
consolidated into one top-level directory, and are now branched and
tagged together.

Updating the vendor area to match this layout is next.

Pull in r374444 from upstream lldb trunk (by me):

2019-10-10T20:33:55+00:00

  Fix process launch failure on FreeBSD after r365761

  Summary:
  After rLLDB365761, and with `LLVM_ENABLE_ABI_BREAKING_CHECKS`
  enabled, launching any process on FreeBSD crashes lldb with:

  ```
  Expected must be checked before access or destruction.
  Expected value was in success state. (Note: Expected values in
  success mode must still be checked prior to being destroyed).
  ```

  This is because `m_operation_thread` and `m_monitor_thread` were
  wrapped in `llvm::Expected<>`, but this requires the objects to be
  correctly initialized before accessing them.

  To fix the crashes, use `llvm::Optional<>` for the members (as
  indicated by labath), and use local variables to store the return
  values of `LaunchThread` and `StartMonitoringChildProcess`.  Then,
  only assign to the member variables after checking if the return
  values indicated success.

  Reviewers: devnexen, emaste, MaskRay, mgorny

  Reviewed By: devnexen

  Subscribers: jfb, labath, krytarowski, lldb-commits

  Differential Revision: https://reviews.llvm.org/D68723

PR:		241137
MFC after:	1 month
X-MFC-With:	r353358

Revert r353363 in preparation for applying upstream fix:

2019-10-10T20:30:54+00:00

Put in a band-aid fix for lldb 9 exiting with "Expected must be
checked before access or destruction" when launching executables, while
we sort this out with upstream.

PR:		241137
MFC after:	1 month
X-MFC-With:	r353358

Put in a band-aid fix for lldb 9 exiting with "Expected must be

2019-10-09T19:51:41+00:00

checked before access or destruction" when launching executables, while
we sort this out with upstream.

Reported by:	jbeich
PR:		241137
MFC after:	1 month
X-MFC-With:	r353358

Merge ^/head r351317 through r351731.

2019-09-03T05:58:43+00:00

lldb: shorten thread names to make logs easier to follow

2019-09-01T16:50:34+00:00

lldb prepends the thread name to log entries, and the existing thread
name for the FreeBSD ProcessMonitor thread was longer than the kernel's
supported thread name length, and so was truncated.  This made logs hard
to read, as the truncated thread name ran into the log message.  Shorten
"lldb.process.freebsd.operation" to just "freebsd.op" so that logs are
more readable.

(Upstreaming to lldb still to be done).

Merge lldb trunk r366426, resolve conflicts, and update FREEBSD-Xlist.

2019-08-22T19:14:02+00:00

Merge lldb trunk r351319, resolve conflicts, and update FREEBSD-Xlist.

2019-01-20T15:00:15+00:00

Merge lldb trunk r338150, and resolve conflicts.

2018-07-31T17:51:25+00:00

lldb: remove assertion that target_arch is FreeBSD

2018-04-24T19:26:58+00:00

The target is not necessarily a FreeBSD binary - for example, it may be
a Linux binary running under the linuxulator.  Basic ptrace (live)
debugging already worked in this case, except for the assertion.

Sponsored by:	Turing Robotic Industries Inc.