Export of internal Abseil changes.

--
7a6ff16a85beb730c172d5d25cf1b5e1be885c56 by Laramie Leavitt <lar@google.com>:

Internal change.

PiperOrigin-RevId: 254454546

--
ff8f9bafaefc26d451f576ea4a06d150aed63f6f by Andy Soffer <asoffer@google.com>:

Internal changes

PiperOrigin-RevId: 254451562

--
deefc5b651b479ce36f0b4ef203e119c0c8936f2 by CJ Johnson <johnsoncj@google.com>:

Account for subtracting unsigned values from the size of InlinedVector

PiperOrigin-RevId: 254450625

--
3c677316a27bcadc17e41957c809ca472d5fef14 by Andy Soffer <asoffer@google.com>:

Add C++17's std::make_from_tuple to absl/utility/utility.h

PiperOrigin-RevId: 254411573

--
4ee3536a918830eeec402a28fc31a62c7c90b940 by CJ Johnson <johnsoncj@google.com>:

Adds benchmark for the rest of the InlinedVector public API

PiperOrigin-RevId: 254408378

--
e5a21a00700ee83498ff1efbf649169756463ee4 by CJ Johnson <johnsoncj@google.com>:

Updates the definition of InlinedVector::shrink_to_fit() to be exception safe and adds exception safety tests for it.

PiperOrigin-RevId: 254401387

--
2ea82e72b86d82d78b4e4712a63a55981b53c64b by Laramie Leavitt <lar@google.com>:

Use absl::InsecureBitGen in place of std::mt19937
in tests absl/random/...distribution_test.cc

PiperOrigin-RevId: 254289444

--
fa099e02c413a7ffda732415e8105cad26a90337 by Andy Soffer <asoffer@google.com>:

Internal changes

PiperOrigin-RevId: 254286334

--
ce34b7f36933b30cfa35b9c9a5697a792b5666e4 by Andy Soffer <asoffer@google.com>:

Internal changes

PiperOrigin-RevId: 254273059

--
6f9c473da7c2090c2e85a37c5f00622e8a912a89 by Jorg Brown <jorg@google.com>:

Change absl::container_internal::CompressedTuple to instantiate its
internal Storage class with the name of the type it's holding, rather
than the name of the Tuple.  This is not an externally-visible change,
other than less compiler memory is used and less debug information is
generated.

PiperOrigin-RevId: 254269285

--
8bd3c186bf2fc0c55d8a2dd6f28a5327502c9fba by Andy Soffer <asoffer@google.com>:

Adding short-hand IntervalClosed for IntervalClosedClosed and IntervalOpen for
IntervalOpenOpen.

PiperOrigin-RevId: 254252419

--
ea957f99b6a04fccd42aa05605605f3b44b1ecfd by Abseil Team <absl-team@google.com>:

Do not directly use __SIZEOF_INT128__.

In order to avoid linker errors when building with clang-cl (__fixunsdfti, __udivti3 and __fixunssfti are undefined), this CL uses ABSL_HAVE_INTRINSIC_INT128 which is not defined for clang-cl.

PiperOrigin-RevId: 254250739

--
89ab385cd26b34d64130bce856253aaba96d2345 by Andy Soffer <asoffer@google.com>:

Internal changes

PiperOrigin-RevId: 254242321

--
cffc793d93eca6d6bdf7de733847b6ab4a255ae9 by CJ Johnson <johnsoncj@google.com>:

Adds benchmark for InlinedVector::reserve(size_type)

PiperOrigin-RevId: 254199226

--
c90c7a9fa3c8f0c9d5114036979548b055ea2f2a by Gennadiy Rozental <rogeeff@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 254072387

--
c4c388beae016c9570ab54ffa1d52660e4a85b7b by Laramie Leavitt <lar@google.com>:

Internal cleanup.

PiperOrigin-RevId: 254062381

--
d3c992e221cc74e5372d0c8fa410170b6a43c062 by Tom Manshreck <shreck@google.com>:

Update distributions.h to Abseil standards

PiperOrigin-RevId: 254054946

--
d15ad0035c34ef11b14fadc5a4a2d3ec415f5518 by CJ Johnson <johnsoncj@google.com>:

Removes functions with only one caller from the implementation details of InlinedVector by manually inlining the definitions

PiperOrigin-RevId: 254005427

--
2f37e807efc3a8ef1f4b539bdd379917d4151520 by Andy Soffer <asoffer@google.com>:

Initial release of Abseil Random

PiperOrigin-RevId: 253999861

--
24ed1694b6430791d781ed533a8f8ccf6cac5856 by CJ Johnson <johnsoncj@google.com>:

Updates the definition of InlinedVector::assign(...)/InlinedVector::operator=(...) to new, exception-safe implementations with exception safety tests to boot

PiperOrigin-RevId: 253993691

--
5613d95f5a7e34a535cfaeadce801441e990843e by CJ Johnson <johnsoncj@google.com>:

Adds benchmarks for InlinedVector::shrink_to_fit()

PiperOrigin-RevId: 253989647

--
2a96ddfdac40bbb8cb6a7f1aeab90917067c6e63 by Abseil Team <absl-team@google.com>:

Initial release of Abseil Random

PiperOrigin-RevId: 253927497

--
bf1aff8fc9ffa921ad74643e9525ecf25b0d8dc1 by Andy Soffer <asoffer@google.com>:

Initial release of Abseil Random

PiperOrigin-RevId: 253920512

--
bfc03f4a3dcda3cf3a4b84bdb84cda24e3394f41 by Laramie Leavitt <lar@google.com>:

Internal change.

PiperOrigin-RevId: 253886486

--
05036cfcc078ca7c5f581a00dfb0daed568cbb69 by Eric Fiselier <ericwf@google.com>:

Don't include `winsock2.h` because it drags in `windows.h` and friends,
and they define awful macros like OPAQUE, ERROR, and more. This has the
potential to break abseil users.

Instead we only forward declare `timeval` and require Windows users
include `winsock2.h` themselves. This is both inconsistent and poor QoI, but so
including 'windows.h' is bad too.

PiperOrigin-RevId: 253852615
GitOrigin-RevId: 7a6ff16a85beb730c172d5d25cf1b5e1be885c56
Change-Id: Icd6aff87da26f29ec8915da856f051129987cef6

1 files changed, 212 insertions, 0 deletions

diff --git a/absl/random/internal/platform.h b/absl/random/internal/platform.h
new file mode 100644
index 000000000000..5edab3448bbf
--- /dev/null
+++ b/absl/random/internal/platform.h
@@ -0,0 +1,212 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_RANDOM_INTERNAL_PLATFORM_H_
+#define ABSL_RANDOM_INTERNAL_PLATFORM_H_
+
+// HERMETIC NOTE: The randen_hwaes target must not introduce duplicate
+// symbols from arbitrary system and other headers, since it may be built
+// with different flags from other targets, using different levels of
+// optimization, potentially introducing ODR violations.
+
+// -----------------------------------------------------------------------------
+// Platform Feature Checks
+// -----------------------------------------------------------------------------
+
+// Currently supported operating systems and associated preprocessor
+// symbols:
+//
+//   Linux and Linux-derived           __linux__
+//   Android                           __ANDROID__ (implies __linux__)
+//   Linux (non-Android)               __linux__ && !__ANDROID__
+//   Darwin (Mac OS X and iOS)         __APPLE__
+//   Akaros (http://akaros.org)        __ros__
+//   Windows                           _WIN32
+//   NaCL                              __native_client__
+//   AsmJS                             __asmjs__
+//   WebAssembly                       __wasm__
+//   Fuchsia                           __Fuchsia__
+//
+// Note that since Android defines both __ANDROID__ and __linux__, one
+// may probe for either Linux or Android by simply testing for __linux__.
+//
+// NOTE: For __APPLE__ platforms, we use #include <TargetConditionals.h>
+// to distinguish os variants.
+//
+// http://nadeausoftware.com/articles/2012/01/c_c_tip_how_use_compiler_predefined_macros_detect_operating_system
+
+#if defined(__APPLE__)
+#include <TargetConditionals.h>
+#endif
+
+// -----------------------------------------------------------------------------
+// Architecture Checks
+// -----------------------------------------------------------------------------
+
+// These preprocessor directives are trying to determine CPU architecture,
+// including necessary headers to support hardware AES.
+//
+// ABSL_ARCH_{X86/PPC/ARM} macros determine the platform.
+#if defined(__x86_64__) || defined(__x86_64) || defined(_M_AMD64) || \
+    defined(_M_X64)
+#define ABSL_ARCH_X86_64
+#elif defined(__i386) || defined(_M_IX86)
+#define ABSL_ARCH_X86_32
+#elif defined(__aarch64__) || defined(__arm64__) || defined(_M_ARM64)
+#define ABSL_ARCH_AARCH64
+#elif defined(__arm__) || defined(__ARMEL__) || defined(_M_ARM)
+#define ABSL_ARCH_ARM
+#elif defined(__powerpc64__) || defined(__PPC64__) || defined(__powerpc__) || \
+    defined(__ppc__) || defined(__PPC__)
+#define ABSL_ARCH_PPC
+#else
+// Unsupported architecture.
+//  * https://sourceforge.net/p/predef/wiki/Architectures/
+//  * https://msdn.microsoft.com/en-us/library/b0084kay.aspx
+//  * for gcc, clang: "echo | gcc -E -dM -"
+#endif
+
+// -----------------------------------------------------------------------------
+// Attribute Checks
+// -----------------------------------------------------------------------------
+
+// ABSL_HAVE_ATTRIBUTE
+#undef ABSL_HAVE_ATTRIBUTE
+#ifdef __has_attribute
+#define ABSL_HAVE_ATTRIBUTE(x) __has_attribute(x)
+#else
+#define ABSL_HAVE_ATTRIBUTE(x) 0
+#endif
+
+// ABSL_ATTRIBUTE_ALWAYS_INLINE forces inlining of the method.
+#undef ABSL_ATTRIBUTE_ALWAYS_INLINE
+#if ABSL_HAVE_ATTRIBUTE(always_inline) || \
+    (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_ATTRIBUTE_ALWAYS_INLINE __attribute__((always_inline))
+#elif defined(_MSC_VER)
+// We can achieve something similar to attribute((always_inline)) with MSVC by
+// using the __forceinline keyword, however this is not perfect. MSVC is
+// much less aggressive about inlining, and even with the __forceinline keyword.
+#define ABSL_ATTRIBUTE_ALWAYS_INLINE __forceinline
+#else
+#define ABSL_ATTRIBUTE_ALWAYS_INLINE
+#endif
+
+// ABSL_ATTRIBUTE_NEVER_INLINE prevents inlining of the method.
+#undef ABSL_ATTRIBUTE_NEVER_INLINE
+#if ABSL_HAVE_ATTRIBUTE(noinline) || (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_ATTRIBUTE_NEVER_INLINE __attribute__((noinline))
+#elif defined(_MSC_VER)
+#define ABSL_ATTRIBUTE_NEVER_INLINE __declspec(noinline)
+#else
+#define ABSL_ATTRIBUTE_NEVER_INLINE
+#endif
+
+// ABSL_ATTRIBUTE_FLATTEN enables much more aggressive inlining within
+// the indicated function.
+#undef ABSL_ATTRIBUTE_FLATTEN
+#if ABSL_HAVE_ATTRIBUTE(flatten) || (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_ATTRIBUTE_FLATTEN __attribute__((flatten))
+#else
+#define ABSL_ATTRIBUTE_FLATTEN
+#endif
+
+// ABSL_RANDOM_INTERNAL_RESTRICT annotates whether pointers may be considered
+// to be unaliased.
+#undef ABSL_RANDOM_INTERNAL_RESTRICT
+#if defined(__clang__) || defined(__GNUC__)
+#define ABSL_RANDOM_INTERNAL_RESTRICT __restrict__
+#elif defined(_MSC_VER)
+#define ABSL_RANDOM_INTERNAL_RESTRICT __restrict
+#else
+#define ABSL_RANDOM_INTERNAL_RESTRICT
+#endif
+
+// ABSL_HAVE_ACCELERATED_AES indicates whether the currently active compiler
+// flags (e.g. -maes) allow using hardware accelerated AES instructions, which
+// implies us assuming that the target platform supports them.
+#define ABSL_HAVE_ACCELERATED_AES 0
+
+#if defined(ABSL_ARCH_X86_64)
+
+#if defined(__AES__) || defined(__AVX__)
+#undef ABSL_HAVE_ACCELERATED_AES
+#define ABSL_HAVE_ACCELERATED_AES 1
+#endif
+
+#elif defined(ABSL_ARCH_PPC)
+
+// Rely on VSX and CRYPTO extensions for vcipher on PowerPC.
+#if (defined(__VEC__) || defined(__ALTIVEC__)) && defined(__VSX__) && \
+    defined(__CRYPTO__)
+#undef ABSL_HAVE_ACCELERATED_AES
+#define ABSL_HAVE_ACCELERATED_AES 1
+#endif
+
+#elif defined(ABSL_ARCH_ARM) || defined(ABSL_ARCH_AARCH64)
+
+// http://infocenter.arm.com/help/topic/com.arm.doc.ihi0053c/IHI0053C_acle_2_0.pdf
+// Rely on NEON+CRYPTO extensions for ARM.
+#if defined(__ARM_NEON) && defined(__ARM_FEATURE_CRYPTO)
+#undef ABSL_HAVE_ACCELERATED_AES
+#define ABSL_HAVE_ACCELERATED_AES 1
+#endif
+
+#endif
+
+// NaCl does not allow AES.
+#if defined(__native_client__)
+#undef ABSL_HAVE_ACCELERATED_AES
+#define ABSL_HAVE_ACCELERATED_AES 0
+#endif
+
+// ABSL_RANDOM_INTERNAL_AES_DISPATCH indicates whether the currently active
+// platform has, or should use run-time dispatch for selecting the
+// acclerated Randen implementation.
+#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 0
+
+#if defined(ABSL_ARCH_X86_64)
+// Dispatch is available on x86_64
+#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
+#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 1
+#elif defined(__linux__) && defined(ABSL_ARCH_PPC)
+// Or when running linux PPC
+#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
+#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 1
+#elif defined(__linux__) && defined(ABSL_ARCH_AARCH64)
+// Or when running linux AArch64
+#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
+#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 1
+#elif defined(__linux__) && defined(ABSL_ARCH_ARM) && (__ARM_ARCH >= 8)
+// Or when running linux ARM v8 or higher.
+// (This captures a lot of Android configurations.)
+#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
+#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 1
+#endif
+
+// NaCl does not allow dispatch.
+#if defined(__native_client__)
+#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
+#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 0
+#endif
+
+// iOS does not support dispatch, even on x86, since applications
+// should be bundled as fat binaries, with a different build tailored for
+// each specific supported platform/architecture.
+#if defined(__APPLE__) && (TARGET_OS_IPHONE || TARGET_OS_IPHONE_SIMULATOR)
+#undef ABSL_RANDOM_INTERNAL_AES_DISPATCH
+#define ABSL_RANDOM_INTERNAL_AES_DISPATCH 0
+#endif
+
+#endif  // ABSL_RANDOM_INTERNAL_PLATFORM_H_