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- 51e2d3690b9065da84dbbf71fb52f87149670719 Fix ABSL_HAVE_THREAD_LOCAL on Apple 32-bit iOS simulato... by Xiaoyi Zhang <zhangxy@google.com>

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- d38332e4d6b51542a42ff49fb0fc4f4a756fdd05 Internal change. by Abseil Team <absl-team@google.com>

GitOrigin-RevId: 51e2d3690b9065da84dbbf71fb52f87149670719
Change-Id: I9403fc6308a6c731f1c8e2cd70fdb382fafd960e
This commit is contained in:
Abseil Team 2018-04-09 08:30:09 -07:00 committed by Matt Calabrese
parent abd0824ba6
commit 3f622d6c59
2 changed files with 20 additions and 13 deletions
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14
absl/base/config.h
View file

@ -138,12 +138,16 @@
// supported. // supported.
#ifdef ABSL_HAVE_THREAD_LOCAL #ifdef ABSL_HAVE_THREAD_LOCAL
#error ABSL_HAVE_THREAD_LOCAL cannot be directly set #error ABSL_HAVE_THREAD_LOCAL cannot be directly set
#elif (!defined(__apple_build_version__) || \ #elif defined(__APPLE__)
(__apple_build_version__ >= 8000042)) && \
!(defined(__APPLE__) && TARGET_OS_IPHONE && \
__IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_9_0)
// Notes: Xcode's clang did not support `thread_local` until version // Notes: Xcode's clang did not support `thread_local` until version
// 8, and even then not for all iOS < 9.0. // 8, and even then not for all iOS < 9.0. Also, Xcode 9.3 started disallowing
// `thread_local` for 32-bit iOS simulator targeting iOS 9.x.
// `__has_feature` is only supported by Clang so it has be inside
// `defined(__APPLE__)` check.
#if __has_feature(cxx_thread_local)
#define ABSL_HAVE_THREAD_LOCAL 1
#endif
#else // !defined(__APPLE__)
#define ABSL_HAVE_THREAD_LOCAL 1 #define ABSL_HAVE_THREAD_LOCAL 1
#endif #endif

19
absl/time/duration.cc
View file

@ -62,6 +62,7 @@
#include <limits> #include <limits>
#include <string> #include <string>
#include "absl/base/casts.h"
#include "absl/numeric/int128.h" #include "absl/numeric/int128.h"
#include "absl/time/time.h" #include "absl/time/time.h"
@ -165,14 +166,16 @@ inline Duration MakeDurationFromU128(uint128 u128, bool is_neg) {
return time_internal::MakeDuration(rep_hi, rep_lo); return time_internal::MakeDuration(rep_hi, rep_lo);
} }
// Convert int64_t to uint64_t in twos-complement system. // Convert between int64_t and uint64_t, preserving representation. This
inline uint64_t EncodeTwosComp(int64_t v) { return static_cast<uint64_t>(v); } // allows us to do arithmetic in the unsigned domain, where overflow has
// well-defined behavior. See operator+=() and operator-=().
// Convert uint64_t to int64_t in twos-complement system. //
inline int64_t DecodeTwosComp(uint64_t v) { // C99 7.20.1.1.1, as referenced by C++11 18.4.1.2, says, "The typedef
if (v <= kint64max) return static_cast<int64_t>(v); // name intN_t designates a signed integer type with width N, no padding
return static_cast<int64_t>(v - kint64max - 1) + kint64min; // bits, and a two's complement representation." So, we can convert to
} // and from the corresponding uint64_t value using a bit cast.
inline uint64_t EncodeTwosComp(int64_t v) { return bit_cast<uint64_t>(v); }
inline int64_t DecodeTwosComp(uint64_t v) { return bit_cast<int64_t>(v); }
// Note: The overflow detection in this function is done using greater/less *or // Note: The overflow detection in this function is done using greater/less *or
// equal* because kint64max/min is too large to be represented exactly in a // equal* because kint64max/min is too large to be represented exactly in a