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Changes imported from Abseil "staging" branch:

Browse source 
- 3e05f2c346a9faf07088c49d590d49a9199e7edd Simplify Duration's operator-() by Jorg Brown <jorg@google.com>
  - 3c4942375a6d17e887bb6ab7cf2d0e763d58a511 Rewrite `noexcept(noexcept(allocator_type()))` to instead... by Matt Calabrese <calabrese@google.com>
  - 02f35a684201a6aa9f70e8b0a041993676f2d230 Fix comment on remove_prefix since the function is not re... by Abseil Team <absl-team@google.com>
  - ceb40aba8031e0ccec9cd49da844882df100c56f Fix mutex_test under TSAN. by Derek Mauro <dmauro@google.com>
  - 7bd12e7ddc5d074e1b9c9f037879211fa1d81f8c Slight wording tweaks for "adopting" wrappers by Abseil Team <absl-team@google.com>
  - c3580afe092e0357d40b1769314f36da1b887c65 Internal cleanup. by Greg Miller <jgm@google.com>

GitOrigin-RevId: 3e05f2c346a9faf07088c49d590d49a9199e7edd
Change-Id: If3df72fba3803398cfcbb323fb4cb84ec55511aa
This commit is contained in:
Abseil Team 2017-10-10 17:07:46 -07:00 committed by Gennadiy Rozental
parent 962e9931d5
commit 029795a9b5
7 changed files with 93 additions and 96 deletions
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8
.ci/abseil-cpp.json
View file

@ -1,8 +0,0 @@
// This is a relaxed JSON format, you can have comments in it.
// This is a list of configuration for the job that does not specify a configuration.
[
{"node": "linux-x86_64"},
{"node": "ubuntu_16.04-x86_64"},
{"node": "darwin-x86_64"},
{"node": "windows-x86_64"}
]

3
absl/container/inlined_vector.h
View file

@ -82,7 +82,8 @@ class InlinedVector {
using reverse_iterator = std::reverse_iterator<iterator>;
using const_reverse_iterator = std::reverse_iterator<const_iterator>;
InlinedVector() noexcept(noexcept(allocator_type()))
InlinedVector() noexcept(
std::is_nothrow_default_constructible<allocator_type>::value)
: allocator_and_tag_(allocator_type()) {}
explicit InlinedVector(const allocator_type& alloc) noexcept

21
absl/memory/memory.h
View file

@ -38,8 +38,8 @@ namespace absl {
// Function Template: WrapUnique()
// -----------------------------------------------------------------------------
//
// Transfers ownership of a raw pointer to a `std::unique_ptr`. The returned
// value is a `std::unique_ptr` of deduced type.
// Adopts ownership from a raw pointer and transfers it to the returned
// `std::unique_ptr`, whose type is deduced.
//
// Example:
// X* NewX(int, int);
@ -169,8 +169,8 @@ typename memory_internal::MakeUniqueResult<T>::invalid make_unique(
// Function Template: RawPtr()
// -----------------------------------------------------------------------------
//
// Extracts the raw pointer from a pointer-like 'ptr'. `absl::RawPtr` is useful
// within templates that need to handle a complement of raw pointers,
// Extracts the raw pointer from a pointer-like value `ptr`. `absl::RawPtr` is
// useful within templates that need to handle a complement of raw pointers,
// `std::nullptr_t`, and smart pointers.
template <typename T>
auto RawPtr(T&& ptr) -> decltype(&*ptr) {
@ -183,9 +183,9 @@ inline std::nullptr_t RawPtr(std::nullptr_t) { return nullptr; }
// Function Template: ShareUniquePtr()
// -----------------------------------------------------------------------------
//
// Transforms a `std::unique_ptr` rvalue into a `std::shared_ptr`. The returned
// value is a `std::shared_ptr` of deduced type and ownership is transferred to
// the shared pointer.
// Adopts a `std::unique_ptr` rvalue and returns a `std::shared_ptr` of deduced
// type. Ownership (if any) of the held value is transferred to the returned
// shared pointer.
//
// Example:
//
@ -194,8 +194,11 @@ inline std::nullptr_t RawPtr(std::nullptr_t) { return nullptr; }
// CHECK_EQ(*sp, 10);
// CHECK(up == nullptr);
//
// Note that this conversion is correct even when T is an array type, although
// the resulting shared pointer may not be very useful.
// Note that this conversion is correct even when T is an array type, and more
// generally it works for *any* deleter of the `unique_ptr` (single-object
// deleter, array deleter, or any custom deleter), since the deleter is adopted
// by the shared pointer as well. The deleter is copied (unless it is a
// reference).
//
// Implements the resolution of [LWG 2415](http://wg21.link/lwg2415), by which a
// null shared pointer does not attempt to call the deleter.

5
absl/strings/string_view.h
View file

@ -295,9 +295,8 @@ class string_view {
// string_view::remove_prefix()
//
// Removes the first `n` characters from the `string_view`, returning a
// pointer to the new first character. Note that the underlying std::string is not
// changed, only the view.
// Removes the first `n` characters from the `string_view`. Note that the
// underlying std::string is not changed, only the view.
void remove_prefix(size_type n) {
assert(n <= length_);
ptr_ += n;

103
absl/synchronization/mutex_test.cc
View file

@ -89,8 +89,6 @@ static void CheckSumG0G1(void *v) {
}
static void TestMu(TestContext *cxt, int c) {
SetInvariantChecked(false);
cxt->mu.EnableInvariantDebugging(CheckSumG0G1, cxt);
for (int i = 0; i != cxt->iterations; i++) {
absl::MutexLock l(&cxt->mu);
int a = cxt->g0 + 1;
@ -100,8 +98,6 @@ static void TestMu(TestContext *cxt, int c) {
}
static void TestTry(TestContext *cxt, int c) {
SetInvariantChecked(false);
cxt->mu.EnableInvariantDebugging(CheckSumG0G1, cxt);
for (int i = 0; i != cxt->iterations; i++) {
do {
std::this_thread::yield();
@ -122,8 +118,6 @@ static void TestR20ms(TestContext *cxt, int c) {
}
static void TestRW(TestContext *cxt, int c) {
SetInvariantChecked(false);
cxt->mu.EnableInvariantDebugging(CheckSumG0G1, cxt);
if ((c & 1) == 0) {
for (int i = 0; i != cxt->iterations; i++) {
absl::WriterMutexLock l(&cxt->mu);
@ -356,67 +350,57 @@ static void EndTest(int *c0, int *c1, absl::Mutex *mu, absl::CondVar *cv,
cv->Signal();
}
// Basis for the parameterized tests configured below.
static int RunTest(void (*test)(TestContext *cxt, int), int threads,
int iterations, int operations) {
TestContext cxt;
// Code common to RunTest() and RunTestWithInvariantDebugging().
static int RunTestCommon(TestContext *cxt, void (*test)(TestContext *cxt, int),
int threads, int iterations, int operations) {
absl::Mutex mu2;
absl::CondVar cv2;
int c0;
int c1;
// run with large thread count for full test and to get timing
#if !defined(ABSL_MUTEX_ENABLE_INVARIANT_DEBUGGING_NOT_IMPLEMENTED)
absl::EnableMutexInvariantDebugging(false);
#endif
c0 = 0;
c1 = 0;
cxt.g0 = 0;
cxt.g1 = 0;
cxt.iterations = iterations;
cxt.threads = threads;
int c0 = 0;
int c1 = 0;
cxt->g0 = 0;
cxt->g1 = 0;
cxt->iterations = iterations;
cxt->threads = threads;
absl::synchronization_internal::ThreadPool tp(threads);
for (int i = 0; i != threads; i++) {
tp.Schedule(std::bind(&EndTest, &c0, &c1, &mu2, &cv2,
std::function<void(int)>(
std::bind(test, &cxt, std::placeholders::_1))));
std::bind(test, cxt, std::placeholders::_1))));
}
mu2.Lock();
while (c1 != threads) {
cv2.Wait(&mu2);
}
mu2.Unlock();
int saved_g0 = cxt.g0;
return cxt->g0;
}
// run again with small number of iterations to test invariant checking
// Basis for the parameterized tests configured below.
static int RunTest(void (*test)(TestContext *cxt, int), int threads,
int iterations, int operations) {
TestContext cxt;
return RunTestCommon(&cxt, test, threads, iterations, operations);
}
// Like RunTest(), but sets an invariant on the tested Mutex and
// verifies that the invariant check happened. The invariant function
// will be passed the TestContext* as its arg and must call
// SetInvariantChecked(true);
#if !defined(ABSL_MUTEX_ENABLE_INVARIANT_DEBUGGING_NOT_IMPLEMENTED)
static int RunTestWithInvariantDebugging(void (*test)(TestContext *cxt, int),
int threads, int iterations,
int operations,
void (*invariant)(void *)) {
absl::EnableMutexInvariantDebugging(true);
#endif
SetInvariantChecked(true);
c0 = 0;
c1 = 0;
cxt.g0 = 0;
cxt.g1 = 0;
cxt.iterations = (iterations > 10 ? 10 : iterations);
cxt.threads = threads;
for (int i = 0; i != threads; i++) {
tp.Schedule(std::bind(&EndTest, &c0, &c1, &mu2, &cv2,
std::function<void(int)>(
std::bind(test, &cxt, std::placeholders::_1))));
}
mu2.Lock();
while (c1 != threads) {
cv2.Wait(&mu2);
}
mu2.Unlock();
#if !defined(ABSL_MUTEX_ENABLE_INVARIANT_DEBUGGING_NOT_IMPLEMENTED)
SetInvariantChecked(false);
TestContext cxt;
cxt.mu.EnableInvariantDebugging(invariant, &cxt);
int ret = RunTestCommon(&cxt, test, threads, iterations, operations);
ABSL_RAW_CHECK(GetInvariantChecked(), "Invariant not checked");
#endif
return saved_g0;
absl::EnableMutexInvariantDebugging(false); // Restore.
return ret;
}
#endif
// --------------------------------------------------------
// Test for fix of bug in TryRemove()
@ -1463,6 +1447,13 @@ TEST_P(MutexVariableThreadCountTest, Mutex) {
int iterations = ScaleIterations(10000000) / threads;
int operations = threads * iterations;
EXPECT_EQ(RunTest(&TestMu, threads, iterations, operations), operations);
#if !defined(ABSL_MUTEX_ENABLE_INVARIANT_DEBUGGING_NOT_IMPLEMENTED)
iterations = std::min(iterations, 10);
operations = threads * iterations;
EXPECT_EQ(RunTestWithInvariantDebugging(&TestMu, threads, iterations,
operations, CheckSumG0G1),
operations);
#endif
}
TEST_P(MutexVariableThreadCountTest, Try) {
@ -1470,6 +1461,13 @@ TEST_P(MutexVariableThreadCountTest, Try) {
int iterations = 1000000 / threads;
int operations = iterations * threads;
EXPECT_EQ(RunTest(&TestTry, threads, iterations, operations), operations);
#if !defined(ABSL_MUTEX_ENABLE_INVARIANT_DEBUGGING_NOT_IMPLEMENTED)
iterations = std::min(iterations, 10);
operations = threads * iterations;
EXPECT_EQ(RunTestWithInvariantDebugging(&TestTry, threads, iterations,
operations, CheckSumG0G1),
operations);
#endif
}
TEST_P(MutexVariableThreadCountTest, R20ms) {
@ -1484,6 +1482,13 @@ TEST_P(MutexVariableThreadCountTest, RW) {
int iterations = ScaleIterations(20000000) / threads;
int operations = iterations * threads;
EXPECT_EQ(RunTest(&TestRW, threads, iterations, operations), operations / 2);
#if !defined(ABSL_MUTEX_ENABLE_INVARIANT_DEBUGGING_NOT_IMPLEMENTED)
iterations = std::min(iterations, 10);
operations = threads * iterations;
EXPECT_EQ(RunTestWithInvariantDebugging(&TestRW, threads, iterations,
operations, CheckSumG0G1),
operations / 2);
#endif
}
TEST_P(MutexVariableThreadCountTest, Await) {

2
absl/time/internal/test_util.cc
View file

@ -63,7 +63,7 @@ const struct ZoneInfo {
{"US/Pacific", //
reinterpret_cast<char*>(America_Los_Angeles), America_Los_Angeles_len},
// Allows use of the local time zone from a common system-specific location.
// Allows use of the local time zone from a system-specific location.
#ifdef _MSC_VER
{"localtime", //
reinterpret_cast<char*>(America_Los_Angeles), America_Los_Angeles_len},

27
absl/time/time.h
View file

@ -1126,8 +1126,10 @@ constexpr Duration OppositeInfinity(Duration d) {
: MakeDuration(std::numeric_limits<int64_t>::min(), ~0U);
}
// Returns (-n)-1 (equivalently -(n+1)) without overflowing on any input value.
// Returns (-n)-1 (equivalently -(n+1)) without avoidable overflow.
constexpr int64_t NegateAndSubtractOne(int64_t n) {
// Note: Good compilers will optimize this expression to ~n when using
// a two's-complement representation (which is required for int64_t).
return (n < 0) ? -(n + 1) : (-n) - 1;
}
@ -1232,26 +1234,21 @@ constexpr bool operator==(Duration lhs, Duration rhs) {
constexpr Duration operator-(Duration d) {
// This is a little interesting because of the special cases.
//
// Infinities stay infinite, and just change direction.
// If rep_lo_ is zero, we have it easy; it's safe to negate rep_hi_, we're
// dealing with an integral number of seconds, and the only special case is
// the maximum negative finite duration, which can't be negated.
//
// The maximum negative finite duration can't be negated (at least, not
// on a two's complement machine), so we return infinity for that case.
// Next we dispatch the case where rep_lo_ is zero, observing that it's
// safe to negate rep_hi_ in this case because it's not int64_t-min (or
// else we'd have handled it above, returning InfiniteDuration()).
// Infinities stay infinite, and just change direction.
//
// Finally we're in the case where rep_lo_ is non-zero, and we can borrow
// a second's worth of ticks and avoid overflow (as negating int64_t-min + 1
// is safe).
return time_internal::IsInfiniteDuration(d)
? time_internal::OppositeInfinity(d)
: (time_internal::GetRepHi(d) ==
std::numeric_limits<int64_t>::min() &&
time_internal::GetRepLo(d) == 0)
return time_internal::GetRepLo(d) == 0
? time_internal::GetRepHi(d) == std::numeric_limits<int64_t>::min()
? InfiniteDuration()
: (time_internal::GetRepLo(d) == 0)
? time_internal::MakeDuration(
-time_internal::GetRepHi(d))
: time_internal::MakeDuration(-time_internal::GetRepHi(d))
: time_internal::IsInfiniteDuration(d)
? time_internal::OppositeInfinity(d)
: time_internal::MakeDuration(
time_internal::NegateAndSubtractOne(
time_internal::GetRepHi(d)),