Summary:Because sometimes things are just different.

MSVC warns about the `dynamic_cast` done against this class because the class's declaration doesn't show that it would need a vtordisp. While I don't believe the `dynamic_cast` in question is actually called in either the constructor or destructor paths for the class, better to be safe and force the disp to be created.

Reviewed By: yfeldblum

Differential Revision: D2887490

Pulled By: Orvid

fb-gh-sync-id: 821a6fc820087ac7120fffd9f8b95a26c2b4e71b
shipit-source-id: 821a6fc820087ac7120fffd9f8b95a26c2b4e71b

Summary:Callbacks passed to e.g. folly::Future::then (or
folly::Future::ensure) may delete the promise that keeps the
Core of the same future alive. The Core must protect itself from
destruction during callback execution.

This commit also adds a unit test to check for correct behaviour
in the "self destruction" scenario. The test should usually pass
even without the fix in Core.h. However, when you run the test
in Valgrind or ASAN, it will report problems unless the fix in
Core.h is applied.

Reviewed By: mhx

Differential Revision: D2938094

fb-gh-sync-id: 22796e168e1876ef2e3c7d7619da020be6a22073
shipit-source-id: 22796e168e1876ef2e3c7d7619da020be6a22073

Summary: Allow createGlobal() to create dependent objects.

Reviewed By: yfeldblum

Differential Revision: D2963111

fb-gh-sync-id: 8e4da48a7a1000934963396b423e8eff98a8aade
shipit-source-id: 8e4da48a7a1000934963396b423e8eff98a8aade

Summary:[Folly] Fix Build: `folly/test/IndestructibleTest.cpp` under LSAN.

Leaks of Meyers singletons are ignored automatically, while normal locals are not. So we make our instances be Meyers singletons.

Differential Revision: D2968368

fb-gh-sync-id: 385ac4491d9a105885af82d85354af929d69cc80
shipit-source-id: 385ac4491d9a105885af82d85354af929d69cc80

Summary: Use Meyers singleton instead.

Reviewed By: afrind

Differential Revision: D2963282

fb-gh-sync-id: 7aec36e7cc3b0ab09b2b093202f40d5b0d399f4d
shipit-source-id: 7aec36e7cc3b0ab09b2b093202f40d5b0d399f4d

Summary: AsyncSocketException: add detailed information in error message

Reviewed By: yfeldblum

Differential Revision: D2953030

fb-gh-sync-id: a5e26036657ecc6c74ad0369650730a2af13bead
shipit-source-id: a5e26036657ecc6c74ad0369650730a2af13bead

Summary:Benchmarks need their own main function, which means they
aren't really useful in cases we can't use a custom main function.

Reviewed By: yfeldblum

Differential Revision: D2962104

fb-gh-sync-id: 25bdc6e5a8bdf8c3aa94d393207a74797b2e1234
shipit-source-id: 25bdc6e5a8bdf8c3aa94d393207a74797b2e1234

Summary:Presence of .debug_aranges implies user expects fast address lookup.
Some addresses might not be avaialble in .debug_aranges.

Don't do slow lookup in .debug_info, as it can lead to unexpected slowdowns.

override-unit-failures

Reviewed By: philippv

Differential Revision: D2965323

fb-gh-sync-id: 405daefd57cdff4344fd231c5f5b7ff4dcd9df8c
shipit-source-id: 405daefd57cdff4344fd231c5f5b7ff4dcd9df8c

Summary: Fixed the build using the homebrew instructions

Reviewed By: yfeldblum

Differential Revision: D2960409

fb-gh-sync-id: 218b879f26b3baab09676cac51787bf36d0b4bed
shipit-source-id: 218b879f26b3baab09676cac51787bf36d0b4bed

Summary:This diff moves all data accessed during
AccessSpreader<>::current(x) into the .data segment, avoiding SIOF
without adding indirection or dynamic gating as would be the case for
normal singleton-like constructs.  The diff also trims the AccessSpreader
API to include only those methods that people actually seem to use.

Reviewed By: djwatson

Differential Revision: D2945205

fb-gh-sync-id: 847e31adc4450217f4ed0575686be261fb504d7c
shipit-source-id: 847e31adc4450217f4ed0575686be261fb504d7c

Summary: test/common/TestMain.cpp should provide the necessary initialization.

Reviewed By: yfeldblum

Differential Revision: D2947245

fb-gh-sync-id: 75b9d241673667badf4dc8fb81285c60cbb8166a
shipit-source-id: 75b9d241673667badf4dc8fb81285c60cbb8166a

Summary: All singleton registration has to happen in .cpp. Otherwise singleton may be double registered if inlined.

Reviewed By: yfeldblum

Differential Revision: D2956951

fb-gh-sync-id: bea425c31270d614f4b8a780204694168602fe86
shipit-source-id: bea425c31270d614f4b8a780204694168602fe86

Summary:It's possible to have nested loopUntilNoReady (with different FiberManagers). See unit test for a simple example.
This diff fixes currentFiberManager_ to be a stack.

Reviewed By: meyering

Differential Revision: D2953468

fb-gh-sync-id: 0abdcb7f43c94e7bb0adef8440699dc8e138d21a
shipit-source-id: 0abdcb7f43c94e7bb0adef8440699dc8e138d21a

Summary: EventBase loop should do it as well, but it's possible for LoopCallback to be removed before EventBaseOnDestructionCallback.

Reviewed By: pavlo-fb

Differential Revision: D2951303

fb-gh-sync-id: 43f5a91e7ecffa7ab7feec32fa45e01b28db66a3
shipit-source-id: 43f5a91e7ecffa7ab7feec32fa45e01b28db66a3

Summary:This implements StaticSingletonManager which is then used to create all leaked Meyers singletons.

StaticSingletonManager is a singleton itself, which is created in a separate compilation unit (Singleton.cpp) and so we can be sure that other compilation units will always see a single instance of StaticSingletonManager, even if linked dynamically.

StaticSingletonManager then keeps a dictionary of typeid -> object pointer, which is used to de-duplicate same singleton being re-created from different compilation units (linked dynamically), usually because of code inlining.

override-unit-failures

Reviewed By: yfeldblum

Differential Revision: D2913027

fb-gh-sync-id: 1f5015a79a7a8297ebf5f0fe3fd0cc7eb44f706b
shipit-source-id: 1f5015a79a7a8297ebf5f0fe3fd0cc7eb44f706b

Summary: `mask(numBits)` returns a temporary variable. After its lifetime ends, subbytes becomes a dangling pointer.

Reviewed By: yfeldblum

Differential Revision: D2953699

fb-gh-sync-id: 5d5a35716ecaa1b3d96edb5a459615756848b92f
shipit-source-id: 5d5a35716ecaa1b3d96edb5a459615756848b92f

Summary:[Folly] `Indestructible`.

For when you need a Meyers singleton that will never be destructed, even at program exit.

Good for large data structures with many heap allocations, as long as they have no behavior. No point in ever destructing them.

HT: Proxygen, and Orvid.

Reviewed By: andriigrynenko

Differential Revision: D2947959

fb-gh-sync-id: 7dd1f725edf137ba81fbf4032a0819fd7c627261
shipit-source-id: 7dd1f725edf137ba81fbf4032a0819fd7c627261

folly: symbolizer: slow address->{file+line-number} lookup if `.debug_aranges` is missing (e.g. --strip-debug-non-line)

Summary:Binaries linked with `gold` and `--strip-debug-non-line` don't have an `.debug_aranges` section

We still want to map `address->{file+line-number}` to get nice stack
traces even though this might be slower (linear search all compilation unit entries in `.debug_info`).

Before:
```
$ # link with gold + --strip-debug-non-line
$ folly/experimental/exception_tracer/exception_tracer_test
E0217 15:02:13.694947 1321814 ExceptionTracer.cpp:179] Exception type: std::runtime_error (9 frames)
    @ 000000000040ad2d __cxa_throw
    @ 0000000000409df3 bar()
    @ 0000000000409eab baz()
    @ 0000000000407c77 main
    @ 00007f00dd9860f5 __libc_start_main
    @ 000000000040991b (unknown)
```

After (similar to the output without `--strip-debug-non-line`):
```
E0217 18:37:37.579596 1583124 ExceptionTracer.cpp:179] Exception type: std::runtime_error (9 frames)
    @ 000000000040ad6d __cxa_throw
                       ./folly/experimental/exception_tracer/ExceptionTracerLib.cpp:57
    @ 0000000000409e33 bar()
                       ./folly/experimental/exception_tracer/ExceptionTracerTest.cpp:24
    @ 0000000000409eeb baz()
                       ./folly/experimental/exception_tracer/ExceptionTracerTest.cpp:51
    @ 0000000000407c87 main
                       ./folly/experimental/exception_tracer/ExceptionTracerTest.cpp:96
    @ 00007f1d16ff80f5 __libc_start_main
    @ 000000000040995b (unknown)
```

Differential Revision: D2947965

fb-gh-sync-id: e517bab324b1dcb70cadc9a5211ce794e35c83a5
shipit-source-id: e517bab324b1dcb70cadc9a5211ce794e35c83a5

Summary: MSVC is actually smarter about this than GCC, as MSVC doesn't support VLAs, it tries to eval the length at compile time. GCC on the other hand doesn't try to eval it at compile time, resulting in compiles via CMake telling us that this is a VLA.

Reviewed By: yfeldblum

Differential Revision: D2911929

fb-gh-sync-id: ffaa133bcf4129a3e02f7e875966d3ae6a97be6a
shipit-source-id: ffaa133bcf4129a3e02f7e875966d3ae6a97be6a

Summary:The existing implementation of folly::applyTuple does not support
mutable callables (such as mutable lambdas and other functor objects
that only implement non-const operator()).

This commit adds a few more unit tests and changes the implementation
so that new and existing tests pass.

Reviewed By: yfeldblum

Differential Revision: D2942622

fb-gh-sync-id: 82478f290e9fd2020358ff79ef0a6bcf8a43738c
shipit-source-id: 82478f290e9fd2020358ff79ef0a6bcf8a43738c

Summary:[Folly] Sort the `Makefile` headers a bit.

Just manually moving a few obviously out-of-order entries.

Reviewed By: Orvid

Differential Revision: D2945668

fb-gh-sync-id: 604976d25e5913ef01d591e23737d61dacfbfc86
shipit-source-id: 604976d25e5913ef01d591e23737d61dacfbfc86

Reviewed By: djwatson

Differential Revision: D2945770

fb-gh-sync-id: 9e4ee3b052b0bbb33ef796b8070edd24c6942589
shipit-source-id: 9e4ee3b052b0bbb33ef796b8070edd24c6942589

Summary: std::call_once is a nice API but the current GCC implementation is slower than it needs to be.  Adding a header-only wrapper with an additional atomic bool.

Reviewed By: luciang

Differential Revision: D2938884

fb-gh-sync-id: 5939c94fe62a1523053dcff26c880ecaec9e1150
shipit-source-id: 5939c94fe62a1523053dcff26c880ecaec9e1150

Summary:--Perhaps this should move to Portability.h instead.  There is another instance of this in io/async/AsyncSocket.cpp.--

Added `portability/SysUio.h` to handle the c-macro conversion into a usable value.

Reviewed By: yfeldblum

Differential Revision: D2940778

fb-gh-sync-id: 897e44b430c02e5a7d826f3e8da9e4979b7b898c
shipit-source-id: 897e44b430c02e5a7d826f3e8da9e4979b7b898c

Summary: Minor changes to AsyncSSLSocket for async crypto

Reviewed By: siyengar

Differential Revision: D2516765

fb-gh-sync-id: 354baeb94e6f63e8d5cdf8455ff5ca49a6aa479c
shipit-source-id: 354baeb94e6f63e8d5cdf8455ff5ca49a6aa479c

Summary: `folly::wrapvFull` fail if the passed in `iovec*` has more than 1024 (`IOV_MAX`) elements. In particular, it returns -1 with errno 22 [Invalid argument]. The fix is to limit maximum size of iovec* to IOV_MAX that is passed in to `readv/writev/...` in a single iteration of outer loop.

Reviewed By: yfeldblum

Differential Revision: D2935540

fb-gh-sync-id: 6c0a073ac0b59db3d53fb4269b13ddfcc479efb1
shipit-source-id: 6c0a073ac0b59db3d53fb4269b13ddfcc479efb1

Summary:There doesn't appear to be a way to use std::enable_if on a
destructor, so conditionally select from one of two storage types.

Reviewed By: yfeldblum

Differential Revision: D2923902

fb-gh-sync-id: 2def8d1031d70379fd84e8eb555dad9d2b4996f2
shipit-source-id: 2def8d1031d70379fd84e8eb555dad9d2b4996f2

Summary: If getVia was called on a future modified using via, getVia could deadlock if the original future was updated to a new executor and there was no callback chained after the call to via. In effect: f.via(executor).getVia(executor); deadlocks. This can be a problem if the code is hidden in a library and the precise semantics are unclear. This diff adds a test that exposes the problem and a fix by forcing waitVia to add a callback that will satisfy the new exector, ensuring that drive() has a callback to trigger once the future is satisfied.

Reviewed By: andriigrynenko

Differential Revision: D2906858

fb-gh-sync-id: a3105079530f15d7a7d39a9381c4078665b721a7
shipit-source-id: a3105079530f15d7a7d39a9381c4078665b721a7

Summary: This also fixes a bug where exception was not re-thrown for functions returning void.

Reviewed By: spalamarchuk

Differential Revision: D2936887

fb-gh-sync-id: 9828dec131203528c27eae874aba147168f40d0d
shipit-source-id: 9828dec131203528c27eae874aba147168f40d0d

Summary:Adding padding for Android was wrong, instead, we should have
used `std::aligned_storage`.

Reviewed By: fugalh

Differential Revision: D2934566

fb-gh-sync-id: f541b89309be70791fced48f63b6b5aecc49bfbb
shipit-source-id: f541b89309be70791fced48f63b6b5aecc49bfbb

Summary:Json.PrintTo test if failing with heap-buffer-overflow asan abort. The problem here comes up
when values of `std::string` and `std::ostrstring::str()` are compared.  `std::ostrstring::str()` returns
*non null* terminated array of `char`s. When compared with `std::string` a read from memory after
the end that array is made. Fixing the test by replacing `std::ostrstream` with `std::ostringstream`,
that does append `\0`.

Reviewed By: yfeldblum

Differential Revision: D2934352

fb-gh-sync-id: c6a5d765c9951716b8a14715702cf3d940c6d723
shipit-source-id: c6a5d765c9951716b8a14715702cf3d940c6d723

Summary:This depends on D2897095.

The main goal here is to start moving onRequestSuccess and onRequestFailure calls higher in the stack.

Reviewed By: mmcduff

Differential Revision: D2899959

fb-gh-sync-id: 4e074c2d734f88f5be56000095b892c6d47c0dcc
shipit-source-id: 4e074c2d734f88f5be56000095b892c6d47c0dcc

Summary: Update copyright for 2016

Reviewed By: igorsugak

Differential Revision: D2828047

fb-gh-sync-id: 8638188aeb694c3ca2a615cc2bc3bc9d251e388d
shipit-source-id: 8638188aeb694c3ca2a615cc2bc3bc9d251e388d

Summary: This adds a folly::Singleton->folly::ThreadLocal dependency to make sure folly::ThreadLocal is always loaded first. Otherwise PthreadKeyUnregister singleton is created after folly::Singleton storage, even though it has higher priority.

Reviewed By: andrewjcg

Differential Revision: D2931170

fb-gh-sync-id: 36392d76e98201f2b4416b4bbef451d6c0e8c69d
shipit-source-id: 36392d76e98201f2b4416b4bbef451d6c0e8c69d

Summary:I hit a landmine where rate() returned 0 for my tests where fewer than 60 items were added per minute.  This was because it was truncating it.  And yet, countRate() was working.
It doesn't make sense for a rate (value accumulated per time period) to be integral.
Folly: I changed rate() to return a double by default for folly, as was done by avg() and countRate().  Looked like a typo to me.
Common wrapper: I changed getRate() to allow you to override and make it double, as was done by getAvg().  Defaulting to int (which is usually the value type) is a bad call IMO but it's a riskier change to change it to double, and I want to be consistent with getAvg().

Reviewed By: tracelog

Differential Revision: D2921061

fb-gh-sync-id: 00875f2ab7963ef3ba2db475aedaf6ebd413b38f
shipit-source-id: 00875f2ab7963ef3ba2db475aedaf6ebd413b38f

Summary: Didn't check this with -Wshadow when I first wrote it.

Reviewed By: ranjeeth

Differential Revision: D2926047

fb-gh-sync-id: 8391986dee2d6b5698491bd2995f039468ec684d
shipit-source-id: 8391986dee2d6b5698491bd2995f039468ec684d

Summary: It should be UL instead of ULL.

Reviewed By: siyengar

Differential Revision: D2926005

fb-gh-sync-id: d2387eb601c50d9820907c831277aa6f8e938cbb
shipit-source-id: d2387eb601c50d9820907c831277aa6f8e938cbb

Summary: Remove boost regex from `stripLeftMargin`. We can shrink some binaries by not including it in the core folly library.

Reviewed By: yfeldblum

Differential Revision: D2922415

fb-gh-sync-id: cee89164c650706f0e5c07eed3d40500831918cd
shipit-source-id: cee89164c650706f0e5c07eed3d40500831918cd

Summary: We want onThreadExit to be canceled as late as possible. Otherwise accessAllThreads() may crash on shutdown (because ThreadEntry is destroyed, but not removed from the global list).

Reviewed By: igorsugak

Differential Revision: D2923435

fb-gh-sync-id: 3a8eef05844bb547c06db33cb96734df1169852a
shipit-source-id: 3a8eef05844bb547c06db33cb96734df1169852a

Summary:
When compiled for -m32, this test fails because of the
difference between longs.

Reviewed By: yfeldblum

Differential Revision: D2924626

fb-gh-sync-id: 8ee863fa2b6df8519bd52d0d3144697a297780bb
shipit-source-id: 8ee863fa2b6df8519bd52d0d3144697a297780bb