Summary: This adds `asm_volatile_memory`, which goes along with the same style used by `asm_volatile_pause`.
This also switches the two places in `RWSpinLock.h` that were using inline assembly for this to use the new functions instead.
Closes #260

Reviewed By: @yfeldblum

Differential Revision: D2283541

Pulled By: @sgolemon

Summary: This adds `FOLLY_ALIGNED` to `Portability.h`, and adjusts the places that were previously using the raw aligned attribute to use this instead.

Closes #262

Reviewed By: @yfeldblum

Differential Revision: D2283639

Pulled By: @sgolemon

Summary: With MSVC, `seedData.begin()` does not return a `void*`, so get a pointer to the data, and explicitly cast that to a `void*` instead.
Closes #251

Reviewed By: @yfeldblum

Differential Revision: D2282929

Pulled By: @sgolemon

Summary: This implements it via a function called on startup. The mechanism used is roughly equivelent of `__attribute__((__constructor__))` in that it doesn't have the ability to set the order of invokation.
Closes #249

Reviewed By: @yfeldblum

Differential Revision: D2282860

Pulled By: @sgolemon

Summary: Before this change you would get an error like:
"Expected to get greater than or equal to1 for value 0"

Now it add in the space correctly:
"Expected to get greater than or equal to 1 for value 0"

Reviewed By: @snarkmaster

Differential Revision: D2288454

Summary: exit() is evil, let's make it easier for programs that want to exit
successfully.

Reviewed By: @meyering

Differential Revision: D2290201

Summary: This diff adds partial specializations of folly::hasher for enum types, std::pair and std::tuple.
We also restrict the specialization for folly::Range to POD value types.

Reviewed By: @ot, @ddrcoder

Differential Revision: D2285554

Summary: [Folly] Fix Build: FOLLY_SSE and preprocessor floats.

Float values for preprocessor symbols are not a thing.

Reviewed By: @​fyan

Differential Revision: D2289436

Summary: This diff fixes the helper template ReturnValue to enable using of applyTuple with
constant refs.

Reviewed By: @ot, @ddrcoder

Differential Revision: D2284733

Summary: Also fix URLs hand-modified by D2219135 which didn't quite update them enough.
Point them at the new repo.

Reviewed By: @yfeldblum

Differential Revision: D2285053

Summary: MSVC will just produce syntax errors if these are left where they currently are. GCC and LLVM support them in either location with the same meaning.
Closes #267

Reviewed By: @yfeldblum

Differential Revision: D2283889

Pulled By: @sgolemon

Summary: Closes #266

Reviewed By: @yfeldblum

Differential Revision: D2283774

Pulled By: @sgolemon

Summary: Closes #261

Reviewed By: @yfeldblum

Differential Revision: D2283554

Pulled By: @sgolemon

Summary: This adds MSVC support for `FOLLY_DEPRECATED`.
Closes #257

Reviewed By: @yfeldblum

Differential Revision: D2283484

Pulled By: @sgolemon

Summary: This unifies ways of detecting SSE support into the FOLLY_SSE define which is a numeric value from 0 to 4.2 depending on detected level.
This also adds a `#define` for `__extension__` which is used in folly, but is GCC specific.
Closes #259

Reviewed By: @yfeldblum

Differential Revision: D2283522

Pulled By: @sgolemon

Summary: This adds MSVC support for `FOLLY_FINAL` and `FOLLY_OVERRIDE`.
Closes #258

Reviewed By: @yfeldblum

Differential Revision: D2283502

Pulled By: @sgolemon

Summary: This adds MSVC support to the detection of FOLLY_HAS_RTTI.
Closes #255

Reviewed By: @yfeldblum

Differential Revision: D2283036

Pulled By: @sgolemon

Summary: Update the internal lambda to mutable to support mutable lambdas as
parameters to Future::ensure()

Reviewed By: @yfeldblum

Differential Revision: D2286097

Summary: MSVC complains if these are not there.
Closes #248

Reviewed By: @yfeldblum

Differential Revision: D2282845

Pulled By: @sgolemon

Summary: MSVC supports the intrinsics used by it without any issue other changes, so just make sure the error doesn't trigger on MSVC.
Closes #252

Reviewed By: @yfeldblum

Differential Revision: D2282942

Pulled By: @sgolemon

Summary: This implements support for `asm_volatile_pause` and `asm_pause`, as defined in `Portability.h`, for MSVC.
This is needed because MSVC x64 doesn't support inline assembly.
Closes #254

Reviewed By: @yfeldblum

Differential Revision: D2283006

Pulled By: @sgolemon

Summary: Noticed because of a warning emitted by MSVC, this fixees the literal for `kLockedPtr_` to correctly be 64-bits under MSVC, rather than 32-bit.
Closes #245

Reviewed By: @yfeldblum

Differential Revision: D2282806

Pulled By: @sgolemon

Summary: MSVC defaults enum sizes to int, so explicitly use `size_t` as the base to have it correctly sized.
Closes #246

Reviewed By: @yfeldblum

Differential Revision: D2282816

Pulled By: @sgolemon

Summary: fix a use after free bug. this line is stupid!

Reviewed By: @siyengar

Differential Revision: D2283041

Summary: she's gooooooone, oh why, oh why, i better learn how to face it...

https://www.youtube.com/watch?v=bnVXIUyshng

Reviewed By: @djwatson

Differential Revision: D2219135

Summary: We have this previously-unused "NOT STARTED" status, which I recently appropriated to denote moved-out `ProcessReturnCode`s.

It's natural to also use this for default-constructed `ProcessReturnCodes`. Lacking a default constructor leads to a bunch of unnecessarily annoying use of `folly::Optional` in my upcoming diff, so I wanted to get rid of that, see e.g.

differential/diff/7657906/

Reviewed By: @tudor

Differential Revision: D2097368

Summary: Using `checkUnixError` after `waitpid()` is confusing and useless, because the only two possible errors are `ECHILD` (some other part of the program waited for this process!?) and `EINVAL` (invalid options, which are hardcoded in both `Subprocess::wait()` and `poll()`). Neither of these are recoverable. Moreover, even if the caller catches the exception, `~Subprocess` is still booby-trapped to `abort()` since its status remains `RUNNING`.

In short, just abort.

Reviewed By: @yfeldblum

Differential Revision: D2079415

Summary: Remove a couple of unused variables, and move one
that was only used inside an ifdef

Reviewed By: @yfeldblum

Differential Revision: D2279989

Summary: IndexedMemPool had one bare usage of std::atomic, rather than
the templated type Atom.  This doesn't affect any non-testing template
instantiations, because those two are usually synonyms, but it could cause
spurious failures of DeterministicSchedule tests.  Found via inspection,
not via failed tests.

Reviewed By: @yfeldblum

Differential Revision: D2277424

Summary: As titled
Trying to troubleshoot shutdown problems in HHVM and I see:
  EventBase::runAfterDelay() callback threw St13runtime_error exception: Raw pointer to a singleton requested after its destruction.
Would be much easier to troubleshoot if I know what is it being requested.

Reviewed By: @chipturner

Differential Revision: D2274497

Summary: This diff isolates the CacheLocality back end for DeterministicSchedule
from one invocation to the next (the last one was deterministic
across the entire program but not per-DeterministicSchedule instance),
and makes it easy to do extensive tracing of memory accesses during
a deterministic test.  These changes were made while tracking down a
bug, but don't fix any bugs on their own (and in fact don't affect any
production code at all).

Reviewed By: @yfeldblum

Differential Revision: D1842390

Summary: Add program_options to fix oss build

Reviewed By: @tudor

Differential Revision: D2274863

Summary: This diff is not yet complete, I want to see the contbuild before I change the
functions that return references to member functions.

It is unsafe to return a pointer when the dynamic object is a rvalue, because if
the pointer escapes the expression after the object is destroyed, we go into
segfault / undefined behavior land.
I have deleted these overloads.  The amount of valid code that is now disallowed
is minimal.  The only valid case I can think of is returing a pointer and
passing it to a function in the same expression that does not save the pointer.
However, this case is also dangerous, because if the function you pass it to
decides to save the pointer for later, we are in trouble, e.g.

  save_ptr(dynamic("str").c_str())

Since there are simple workarounds (naming the object), I think that is a small
price to pay for the greatly increased safety.

The next step is to overload all members that return a reference to a member
to move the member out if the dynamic is a rvalue:

  const dynamic& at(dynamic const&) const&;
        dynamic& at(dynamic const&)      &;
        dynamic  at(dynamic const&)      &&;  // Move out

I also need to go over the code more carefully to make sure that nothing went
wrong.

Reviewed By: @marcinpe

Differential Revision: D2257914

Summary: Many command line apps are of the form
"program [--global_options] command [--command_options] args..."

Make writing such things less painful.

+jdelong because smcc

Reviewed By: @meyering

Differential Revision: D2217248

Summary: GFlags is useful for global program options. boost::program_options makes it
easier to write command-line utilities. They don't, unfortunately, play
very nicely with each other.

Add a addGFlags() function to convert all GFlags to boost::program_options
options; you can then use boost::program_options::parse_command_line() to
parse all arguments, GFlags or not.

Also add a helper function to make parsing nested command lines easier.

Reviewed By: @fugalh

Differential Revision: D2215285

Summary: SharedMutex purposely allows the inline reader count to underflow in some
situations while preserving proper locking behavior (the inline reader
count is only trusted if all deferred locks have been applied), but there
was an additional way that this could occur that wasn't documented or
allowed by the asserts.  The effect was a false positive assert in rare
conditions or the possibility of losing track of a deferred lock slot.
This diff fixes both the over-aggressive assert and the potential loss
of the shared slot.  If the assert didn't fire for you then this diff
won't change the correctness of your program.

Reviewed By: @yfeldblum

Differential Revision: D2269018

Summary: Because I didn't want to write it again.

Reviewed By: @yfeldblum

Differential Revision: D2217246

Summary: fixing compiler errors when compiling with Wunused-parameter

Reviewed By: @yfeldblum

Differential Revision: D2267014

Summary: Thanks @​peijinz for finding this.

Reviewed By: @​peijinz

Differential Revision: D2268532