Summary:PicoSpinLock only works on x86_64, Arm64, and ppc64 (i.e.,
not 32-bit).  Add a bit of gating so we can continue to run tests and
use headers when compiling for i386.

Reviewed By: yfeldblum

Differential Revision: D2991328

fb-gh-sync-id: b0d0c229508f65dff62b24fdd9d80c799cd97935
shipit-source-id: b0d0c229508f65dff62b24fdd9d80c799cd97935

Summary: Address the exception safety hole described in https://fburl.com/scopeguard-oops. Addnditional noexcept to the places that need it.

Reviewed By: dcolascione

Differential Revision: D3033015

fb-gh-sync-id: 8dfec103bbc86abef425585371994756d3df0a14
shipit-source-id: 8dfec103bbc86abef425585371994756d3df0a14

Summary:The vast majority of `folly::dynamic` array initializations are
single-line and with no nested arrays, so we can fix them with a
syntactic codemod. This also fixes a couple of singletons.

For empty arrays:
```
codemod '((?:folly::)?)(dynamic\s+\w+\s*=\s*)({\s*})' '\1\2\1dynamic::array'
```

For non-empty ones:
```
codemod '((?:folly::)?)(dynamic\s+\w+\s*=\s*)(?:{\s*([^{}]+?)\s*})' '\1\2\1dynamic::array(\3)'
```

Reviewed By: igorsugak

Differential Revision: D3030338

fb-gh-sync-id: 3e56704a6c6294d6f6270e42a1776d991a7938df
shipit-source-id: 3e56704a6c6294d6f6270e42a1776d991a7938df

Summary: This allows HTTPTransactions to be held back until the transport is replay-safe.

Reviewed By: siyengar

Differential Revision: D2974083

fb-gh-sync-id: 037b14c24a80c828a25e483b6873a8e782af0cb4
shipit-source-id: 037b14c24a80c828a25e483b6873a8e782af0cb4

Summary: Windows has it, but it doesn't define lstat, and a few other functions have other names.

Reviewed By: yfeldblum

Differential Revision: D3003096

fb-gh-sync-id: e7bc210390d18806c8c89cbc18711bb7a728e12f
shipit-source-id: e7bc210390d18806c8c89cbc18711bb7a728e12f

Summary: This was causing a bunch of SIGBUS's on ARM platforms.

Reviewed By: yfeldblum, mzlee

Differential Revision: D3013458

fb-gh-sync-id: 6d3f60c3f59d16cd3454e3a4231b967e5378724a
shipit-source-id: 6d3f60c3f59d16cd3454e3a4231b967e5378724a

Summary:SSLContext and AsyncSSLSocket are growing with a lot of code that is
OpenSSL-specific, and it may be good to refactor some of these before it gets
out of hand.

This is also useful to reduce complexity as we some additional features such as ServerHello parsing and TLS Cached Info (D2936570)

Main changes:
 * Created a subdirectory folly/io/async/ssl to refactor code from folly/io/async. We may want to consider moving this out of folly/io/async
 * Moved OpenSSLPtrTypes.h to folly/io/async/ssl/OpenSSLPtrTypes.h
 * Moved 'OpenSSLUtils' from SSLContext to separate file OpenSSLUtils.{h,cpp}
 * Moved TLSExtensions and ClientHelloInfo from AsyncSSLSocket to TLSDefinitions.h

Reviewed By: siyengar

Differential Revision: D2978707

fb-gh-sync-id: a21f02947aeffccc447da2124a91cc99315df1c7
shipit-source-id: a21f02947aeffccc447da2124a91cc99315df1c7

Summary:This diff uses the x86 "pause" instruction or its equivalent when
spinning in the MicroLock slow loop.  This gives a hint to the processor
that it should devote more resources to the other execution contexts
sharing the same core.  This diff also removes an mfence on x86 by using
a slightly stronger memory model on the preceding compare_exchange_weak,
and switches to a more portable way of invoking sched_yield().

Reviewed By: dcolascione

Differential Revision: D3018568

fb-gh-sync-id: 02e0ab3a9d9bb9901eddf54e45b71cbb7758a227
shipit-source-id: 02e0ab3a9d9bb9901eddf54e45b71cbb7758a227

Summary:After DR95 the single braces dispatch to the copy constructor
(http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1467),
so it is not possible anymore to initialize a singleton dynamic array
using the braces syntax. The initializer list constructor already had
a special case for empty lists, which unconditionally called the
default constructor if defined.

This diff deprecates the braces syntax and defines the following alternative:
```
dynamic empty = dynamic::array;
dynamic a = dynamic::array(1, 2, "foo");
```

Reviewed By: luciang, yfeldblum

Differential Revision: D3013423

fb-gh-sync-id: a0cf09dfd96e9806044f7c3bf3592c637a9bc932
shipit-source-id: a0cf09dfd96e9806044f7c3bf3592c637a9bc932

Summary:Guarding this the same way it is done in
detail/CacheLocality.cpp

Reviewed By: yfeldblum

Differential Revision: D3013288

fb-gh-sync-id: a1cc65cccc5cdf32339a739853c27a11ecd98ba0
shipit-source-id: a1cc65cccc5cdf32339a739853c27a11ecd98ba0

Summary: Because Windows' defines seem to get in the way more than they help.

Reviewed By: yfeldblum

Differential Revision: D2989507

fb-gh-sync-id: 148f390ef6adf977bffa2262aa76839b2bf4f507
shipit-source-id: 148f390ef6adf977bffa2262aa76839b2bf4f507

Summary: [Folly] A warning for the `portability` headers.

Reviewed By: mzlee, Orvid, meyering

Differential Revision: D3014442

fb-gh-sync-id: f6557d8021dc2a50a656685492d717fdbff1124a
shipit-source-id: f6557d8021dc2a50a656685492d717fdbff1124a

Summary: tmpdir does not work on all platforms. TemporaryDirectory is more robust.

Reviewed By: yfeldblum

Differential Revision: D3013866

fb-gh-sync-id: 51e2b7ec2348eb95b99c125a27bb2aca2b87ac21
shipit-source-id: 51e2b7ec2348eb95b99c125a27bb2aca2b87ac21

Summary: Windows has it, but it doesn't define pid_t. It also doesn't define ssize_t, and it's not worth a separate header for a single typedef, so define it here as well.

Reviewed By: yfeldblum

Differential Revision: D3001168

fb-gh-sync-id: 3722270181c200bbcf39043960f81609c854b132
shipit-source-id: 3722270181c200bbcf39043960f81609c854b132

Summary: clang would complain about losing integer precision. Use unsigned for offset calculation.

Reviewed By: luciang

Differential Revision: D3011253

fb-gh-sync-id: 10cb603708a22bf0e57f41b2486ffca4f5bf7a14
shipit-source-id: 10cb603708a22bf0e57f41b2486ffca4f5bf7a14

Summary: This allows the transport to signal to a higher layer when it has become replay-safe.

Reviewed By: siyengar

Differential Revision: D2974057

fb-gh-sync-id: 436f0c66b78f72ad34cdf4fe117771ea96b4388b
shipit-source-id: 436f0c66b78f72ad34cdf4fe117771ea96b4388b

Summary:The class name for std::runtime_erorr is sometimes
St13runtime_error instead. And there is simlar mapping for other
classes.

Reviewed By: yfeldblum

Differential Revision: D3013228

fb-gh-sync-id: 6a162de348eeaa51c059f9619e25ecf051615bfc
shipit-source-id: 6a162de348eeaa51c059f9619e25ecf051615bfc

Summary: Apparently I don't know what I'm doing. But given lock_ is 8bit and the assert, I suppose cast offset_bytes to unsigned is safe.

Reviewed By: dcolascione

Differential Revision: D3010732

fb-gh-sync-id: 1f3440a72d2f0b2fb145ab36966f0382a3009e0c
shipit-source-id: 1f3440a72d2f0b2fb145ab36966f0382a3009e0c

Summary: Remove persistent cork

Reviewed By: francis-ma

Differential Revision: D3008550

fb-gh-sync-id: a5ce492876d98d74f5669c5ec5ff3486c0cb0b2c
shipit-source-id: a5ce492876d98d74f5669c5ec5ff3486c0cb0b2c

Summary: Instructions.h depends on glog/logging.h because of DCHECK_GT macros.

Reviewed By: ot

Differential Revision: D3009084

fb-gh-sync-id: 05012e635a8c623ca1e653cc41a460778942c39e
shipit-source-id: 05012e635a8c623ca1e653cc41a460778942c39e

Summary:MicroLock is a full-featured lock that fills the niche that
MicroSpinLock and PicoSpinLock currently inhabit.  Unlike these two
classes, MicroLock is a sleeping lock.  MicroLock requires two bits of
a single word and has no particular alignment requirements.

Reviewed By: ot

Differential Revision: D3004474

fb-gh-sync-id: a9bd28bd3f48e894d5bff407612ee4b228466209
shipit-source-id: a9bd28bd3f48e894d5bff407612ee4b228466209

Summary: rand_r is not provided on all platforms, so use `folly::Random` instead.

Reviewed By: yfeldblum

Differential Revision: D3000351

fb-gh-sync-id: 45df3e1957c4b529ab2d2cb4db13b71d13dcef5d
shipit-source-id: 45df3e1957c4b529ab2d2cb4db13b71d13dcef5d

Summary:DynamicConverter doesn't currently support reading enums.
This diff addresses that by adding an enum specialization that uses integers as its underlying implementation.
A follow-up is to handle both integers and strings, but that would require a way to parse strings into enums like Thrift static reflection provides (see https://github.com/facebook/fbthrift/blob/d17b072daddbd318f9afaa5562100eaba0f890e3/thrift/lib/cpp2/fatal/folly_dynamic-inl.h#L88,L92.

Reviewed By: yfeldblum

Differential Revision: D3002569

fb-gh-sync-id: 27bf4a9d5a7844762f5311e2c777606a0e7753f0
shipit-source-id: 27bf4a9d5a7844762f5311e2c777606a0e7753f0

Summary:uint64_t is an unsigned long for 64-bit, but a long long int
for 32-bit.  `%lu` can cause truncation in certain implementations of
libc.

Reviewed By: ngoyal

Differential Revision: D3007568

fb-gh-sync-id: bbb1896c9727cbff413ac73ff0caa12bae5d8a6a
shipit-source-id: bbb1896c9727cbff413ac73ff0caa12bae5d8a6a

Summary:Allow applications to specify a service identity tied to an SSLSocket
that can be used as a ticket cache key.

Further, add the cache key to the SSL_SESSION object and serialize it.

Reviewed By: siyengar

Differential Revision: D2991005

fb-gh-sync-id: 25a5ddbb66bd9da2084159136cbe4d55b9e00f28
shipit-source-id: 25a5ddbb66bd9da2084159136cbe4d55b9e00f28

Summary: All the work we do in SSLContext to check the cipher and NPN usage is actually completely unnecessary since OpenSSL internally checks the cipher and use of ALPN/NPN after you set the SSL_MODE option (see `ssl3_can_cutthrough()` in ssl_lib.c). This just sets the option on the SSLContext instead.

Reviewed By: siyengar

Differential Revision: D3002063

fb-gh-sync-id: 4514faf9ed2eb42a6e41d9e682b2c8aa52c46691
shipit-source-id: 4514faf9ed2eb42a6e41d9e682b2c8aa52c46691

Summary:https://www.openssl.org/docs/manmaster/ssl/SSL_get_error.html
OpenSSL errors are a pain to deal with and we were handling several cases
incorrectly, resulting in a ton of "DH lib" errors when none were likely
actually DH lib errors.

Reviewed By: siyengar

Differential Revision: D2999084

fb-gh-sync-id: b3182be2c199f79ed341af7dbf7524197a838584
shipit-source-id: b3182be2c199f79ed341af7dbf7524197a838584

Summary: Windows doesn't have it.

Reviewed By: yfeldblum

Differential Revision: D2990219

fb-gh-sync-id: e9fe96905ec415874f0e2732b0685f3e7ad5d018
shipit-source-id: e9fe96905ec415874f0e2732b0685f3e7ad5d018

Summary: We could provide `posix_memalign` instead as part of portability, but I am not sure how to tell whether or not it will be available.

Reviewed By: yfeldblum

Differential Revision: D2991432

fb-gh-sync-id: 587314d43779f3b8fead2c41ed05016e6350f2ee
shipit-source-id: 587314d43779f3b8fead2c41ed05016e6350f2ee

Reviewed By: yfeldblum

Differential Revision: D2998122

fb-gh-sync-id: a113ba1a474da8a46052091acadb90c95d3c0c28
shipit-source-id: a113ba1a474da8a46052091acadb90c95d3c0c28

Summary:On i368 (until, I'm lead to believe i686) `%ebx` is used for the PIC register. Thus, when we use cpuid, we clobber that register and gcc loudly complains:

  folly/CpuId.h: In member function 'virtual void CpuId_Simple_Test::TestBody()':
  folly/CpuId.h:67:61: error: PIC register clobbered by 'ebx' in 'asm'
       __asm__("cpuid" : "=a"(n) : "a"(0) : "ebx", "edx", "ecx");

Reviewed By: yfeldblum

Differential Revision: D2991229

fb-gh-sync-id: ee8795e36a4c173147d61e26c9590ec5da1d02b5
shipit-source-id: ee8795e36a4c173147d61e26c9590ec5da1d02b5

Summary: Although MSVC does have time.h, and does have equivelents of these functions, those have slightly different semantics so we have to wrap them.

Reviewed By: yfeldblum

Differential Revision: D2983613

fb-gh-sync-id: 676cd524ffa834a4250a2acc76aa1200eefe62cc
shipit-source-id: 676cd524ffa834a4250a2acc76aa1200eefe62cc

Summary: Spinlocks are a bad idea most of the time.

Reviewed By: rickbrew

Differential Revision: D2996558

fb-gh-sync-id: e86f1f0a084bda0c16759e979201db2e18102555
shipit-source-id: e86f1f0a084bda0c16759e979201db2e18102555

Summary: This causes a symbol collision tests are compiled into a library.

Differential Revision: D2991357

fb-gh-sync-id: 912be0df42216004a07213d62b68ff3f4713beb0
shipit-source-id: 912be0df42216004a07213d62b68ff3f4713beb0

Summary:As-per the documenation of FILETIME:

"Do not cast a pointer to a FILETIME structure to either a ULARGE_INTEGER* or __int64* value because it can cause alignment faults on 64-bit Windows."

Reviewed By: yfeldblum

Differential Revision: D2989434

fb-gh-sync-id: cf57d569a785e0eb7225b346730bf2ed4c50dc55
shipit-source-id: cf57d569a785e0eb7225b346730bf2ed4c50dc55

Summary: I missed these in my initial diff.

Reviewed By: yfeldblum

Differential Revision: D2989977

fb-gh-sync-id: 0efb92286a8aed91ec1d394572cd709e5b6b37ab
shipit-source-id: 0efb92286a8aed91ec1d394572cd709e5b6b37ab

Summary:Changed from size_t to unsigned in a recent tp2 update
https://github.com/jemalloc/jemalloc/blame/3c07f803aa282598451eb0664cc94717b769a5e6/test/unit/mallctl.c

Reviewed By: jasone, mhlakhani

Differential Revision: D2991755

fb-gh-sync-id: 46f2be722a30706333eac6428f4183ca9cb85543
shipit-source-id: 46f2be722a30706333eac6428f4183ca9cb85543

Summary: Also remove an extra `#include <strstream>` from JsonTest.cpp as it is no longer necessary.

Reviewed By: yfeldblum

Differential Revision: D2991381

fb-gh-sync-id: 386b8281726d034933ebdc26733dd35dc5ace949
shipit-source-id: 386b8281726d034933ebdc26733dd35dc5ace949

Summary: We do not need this main function, so remove it.

Reviewed By: markisaa

Differential Revision: D2992000

fb-gh-sync-id: 30bc0734af0f61e047276dab9639ae29cc999bbb
shipit-source-id: 30bc0734af0f61e047276dab9639ae29cc999bbb

Summary:previously we were not able to do

Future<Base> f = makeFuture<Derived>();

This is because Future did not declare a conversion
constructor.

Adding a proper conversion ctor for Future is very
tricky because of the way Core is managed under the hood.
Core is not movable, and cannot be moved otherwise we
would have to retain pointers to the Future and Promises which
pointed to a particular core. This would be inefficient.

Instead we compromise and allow a very small subset of conversions
from objects whose templated types are convertible and also the
sizes of their Cores are also the same. As a result, we can
convert between types like unique_ptrs however not always between
full objects.

Reviewed By: jsedgwick

Differential Revision: D2943775

fb-gh-sync-id: 7c2388f2fb49d789c80ae2477814e960a099771b
shipit-source-id: 7c2388f2fb49d789c80ae2477814e960a099771b