summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--absl/base/config.h2
-rw-r--r--absl/base/internal/cycleclock.cc53
-rw-r--r--absl/base/internal/cycleclock.h69
-rw-r--r--absl/base/internal/unscaledcycleclock.cc6
-rw-r--r--absl/base/internal/unscaledcycleclock.h10
-rw-r--r--absl/random/internal/generate_real.h4
-rw-r--r--absl/random/uniform_real_distribution.h2
-rw-r--r--absl/random/uniform_real_distribution_test.cc121
-rw-r--r--absl/status/status.h4
-rw-r--r--absl/strings/cord.h6
10 files changed, 176 insertions, 101 deletions
diff --git a/absl/base/config.h b/absl/base/config.h
index cd7781c0..8c100d8e 100644
--- a/absl/base/config.h
+++ b/absl/base/config.h
@@ -425,7 +425,7 @@ static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != 'h' ||
#ifdef ABSL_HAVE_PTHREAD_GETSCHEDPARAM
#error ABSL_HAVE_PTHREAD_GETSCHEDPARAM cannot be directly set
#elif defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \
- defined(_AIX) || defined(__ros__) || defined(__OpenBSD__) || \
+ defined(_AIX) || defined(__ros__) || defined(__OpenBSD__) || \
defined(__NetBSD__)
#define ABSL_HAVE_PTHREAD_GETSCHEDPARAM 1
#endif
diff --git a/absl/base/internal/cycleclock.cc b/absl/base/internal/cycleclock.cc
index 0e65005b..f6e64242 100644
--- a/absl/base/internal/cycleclock.cc
+++ b/absl/base/internal/cycleclock.cc
@@ -25,6 +25,7 @@
#include <atomic>
#include <chrono> // NOLINT(build/c++11)
+#include "absl/base/attributes.h"
#include "absl/base/internal/unscaledcycleclock.h"
namespace absl {
@@ -33,44 +34,18 @@ namespace base_internal {
#if ABSL_USE_UNSCALED_CYCLECLOCK
-namespace {
+constexpr int32_t CycleClock::kShift;
+constexpr double CycleClock::kFrequencyScale;
-#ifdef NDEBUG
-#ifdef ABSL_INTERNAL_UNSCALED_CYCLECLOCK_FREQUENCY_IS_CPU_FREQUENCY
-// Not debug mode and the UnscaledCycleClock frequency is the CPU
-// frequency. Scale the CycleClock to prevent overflow if someone
-// tries to represent the time as cycles since the Unix epoch.
-static constexpr int32_t kShift = 1;
-#else
-// Not debug mode and the UnscaledCycleClock isn't operating at the
-// raw CPU frequency. There is no need to do any scaling, so don't
-// needlessly sacrifice precision.
-static constexpr int32_t kShift = 0;
-#endif
-#else
-// In debug mode use a different shift to discourage depending on a
-// particular shift value.
-static constexpr int32_t kShift = 2;
-#endif
-
-static constexpr double kFrequencyScale = 1.0 / (1 << kShift);
-static std::atomic<CycleClockSourceFunc> cycle_clock_source;
+ABSL_CONST_INIT std::atomic<CycleClockSourceFunc>
+ CycleClock::cycle_clock_source_{nullptr};
-CycleClockSourceFunc LoadCycleClockSource() {
- // Optimize for the common case (no callback) by first doing a relaxed load;
- // this is significantly faster on non-x86 platforms.
- if (cycle_clock_source.load(std::memory_order_relaxed) == nullptr) {
- return nullptr;
- }
- // This corresponds to the store(std::memory_order_release) in
- // CycleClockSource::Register, and makes sure that any updates made prior to
- // registering the callback are visible to this thread before the callback is
- // invoked.
- return cycle_clock_source.load(std::memory_order_acquire);
+void CycleClockSource::Register(CycleClockSourceFunc source) {
+ // Corresponds to the load(std::memory_order_acquire) in LoadCycleClockSource.
+ CycleClock::cycle_clock_source_.store(source, std::memory_order_release);
}
-} // namespace
-
+#ifdef _WIN32
int64_t CycleClock::Now() {
auto fn = LoadCycleClockSource();
if (fn == nullptr) {
@@ -78,15 +53,7 @@ int64_t CycleClock::Now() {
}
return fn() >> kShift;
}
-
-double CycleClock::Frequency() {
- return kFrequencyScale * base_internal::UnscaledCycleClock::Frequency();
-}
-
-void CycleClockSource::Register(CycleClockSourceFunc source) {
- // Corresponds to the load(std::memory_order_acquire) in LoadCycleClockSource.
- cycle_clock_source.store(source, std::memory_order_release);
-}
+#endif
#else
diff --git a/absl/base/internal/cycleclock.h b/absl/base/internal/cycleclock.h
index a18b5844..9704e388 100644
--- a/absl/base/internal/cycleclock.h
+++ b/absl/base/internal/cycleclock.h
@@ -42,14 +42,19 @@
#ifndef ABSL_BASE_INTERNAL_CYCLECLOCK_H_
#define ABSL_BASE_INTERNAL_CYCLECLOCK_H_
+#include <atomic>
#include <cstdint>
+#include "absl/base/attributes.h"
#include "absl/base/config.h"
+#include "absl/base/internal/unscaledcycleclock.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
+using CycleClockSourceFunc = int64_t (*)();
+
// -----------------------------------------------------------------------------
// CycleClock
// -----------------------------------------------------------------------------
@@ -68,12 +73,37 @@ class CycleClock {
static double Frequency();
private:
+#if ABSL_USE_UNSCALED_CYCLECLOCK
+ static CycleClockSourceFunc LoadCycleClockSource();
+
+#ifdef NDEBUG
+#ifdef ABSL_INTERNAL_UNSCALED_CYCLECLOCK_FREQUENCY_IS_CPU_FREQUENCY
+ // Not debug mode and the UnscaledCycleClock frequency is the CPU
+ // frequency. Scale the CycleClock to prevent overflow if someone
+ // tries to represent the time as cycles since the Unix epoch.
+ static constexpr int32_t kShift = 1;
+#else
+ // Not debug mode and the UnscaledCycleClock isn't operating at the
+ // raw CPU frequency. There is no need to do any scaling, so don't
+ // needlessly sacrifice precision.
+ static constexpr int32_t kShift = 0;
+#endif
+#else // NDEBUG
+ // In debug mode use a different shift to discourage depending on a
+ // particular shift value.
+ static constexpr int32_t kShift = 2;
+#endif // NDEBUG
+
+ static constexpr double kFrequencyScale = 1.0 / (1 << kShift);
+ ABSL_CONST_INIT static std::atomic<CycleClockSourceFunc> cycle_clock_source_;
+#endif // ABSL_USE_UNSCALED_CYCLECLOC
+
CycleClock() = delete; // no instances
CycleClock(const CycleClock&) = delete;
CycleClock& operator=(const CycleClock&) = delete;
-};
-using CycleClockSourceFunc = int64_t (*)();
+ friend class CycleClockSource;
+};
class CycleClockSource {
private:
@@ -87,6 +117,41 @@ class CycleClockSource {
static void Register(CycleClockSourceFunc source);
};
+#if ABSL_USE_UNSCALED_CYCLECLOCK
+
+inline CycleClockSourceFunc CycleClock::LoadCycleClockSource() {
+#if !defined(__x86_64__)
+ // Optimize for the common case (no callback) by first doing a relaxed load;
+ // this is significantly faster on non-x86 platforms.
+ if (cycle_clock_source_.load(std::memory_order_relaxed) == nullptr) {
+ return nullptr;
+ }
+#endif // !defined(__x86_64__)
+
+ // This corresponds to the store(std::memory_order_release) in
+ // CycleClockSource::Register, and makes sure that any updates made prior to
+ // registering the callback are visible to this thread before the callback
+ // is invoked.
+ return cycle_clock_source_.load(std::memory_order_acquire);
+}
+
+// Accessing globals in inlined code in Window DLLs is problematic.
+#ifndef _WIN32
+inline int64_t CycleClock::Now() {
+ auto fn = LoadCycleClockSource();
+ if (fn == nullptr) {
+ return base_internal::UnscaledCycleClock::Now() >> kShift;
+ }
+ return fn() >> kShift;
+}
+#endif
+
+inline double CycleClock::Frequency() {
+ return kFrequencyScale * base_internal::UnscaledCycleClock::Frequency();
+}
+
+#endif // ABSL_USE_UNSCALED_CYCLECLOCK
+
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
diff --git a/absl/base/internal/unscaledcycleclock.cc b/absl/base/internal/unscaledcycleclock.cc
index 4d352bd1..7b79d19e 100644
--- a/absl/base/internal/unscaledcycleclock.cc
+++ b/absl/base/internal/unscaledcycleclock.cc
@@ -49,12 +49,6 @@ double UnscaledCycleClock::Frequency() {
#elif defined(__x86_64__)
-int64_t UnscaledCycleClock::Now() {
- uint64_t low, high;
- __asm__ volatile("rdtsc" : "=a"(low), "=d"(high));
- return (high << 32) | low;
-}
-
double UnscaledCycleClock::Frequency() {
return base_internal::NominalCPUFrequency();
}
diff --git a/absl/base/internal/unscaledcycleclock.h b/absl/base/internal/unscaledcycleclock.h
index 681ff8f9..07f867a6 100644
--- a/absl/base/internal/unscaledcycleclock.h
+++ b/absl/base/internal/unscaledcycleclock.h
@@ -115,6 +115,16 @@ class UnscaledCycleClock {
friend class base_internal::UnscaledCycleClockWrapperForInitializeFrequency;
};
+#if defined(__x86_64__)
+
+inline int64_t UnscaledCycleClock::Now() {
+ uint64_t low, high;
+ __asm__ volatile("rdtsc" : "=a"(low), "=d"(high));
+ return (high << 32) | low;
+}
+
+#endif
+
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
diff --git a/absl/random/internal/generate_real.h b/absl/random/internal/generate_real.h
index d5fbb44c..b569450c 100644
--- a/absl/random/internal/generate_real.h
+++ b/absl/random/internal/generate_real.h
@@ -50,10 +50,10 @@ struct GenerateSignedTag {};
// inputs, otherwise it never returns 0.
//
// When a value in U(0,1) is required, use:
-// Uniform64ToReal<double, PositiveValueT, true>;
+// GenerateRealFromBits<double, PositiveValueT, true>;
//
// When a value in U(-1,1) is required, use:
-// Uniform64ToReal<double, SignedValueT, false>;
+// GenerateRealFromBits<double, SignedValueT, false>;
//
// This generates more distinct values than the mathematical equivalent
// `U(0, 1) * 2.0 - 1.0`.
diff --git a/absl/random/uniform_real_distribution.h b/absl/random/uniform_real_distribution.h
index 5ba17b23..19683341 100644
--- a/absl/random/uniform_real_distribution.h
+++ b/absl/random/uniform_real_distribution.h
@@ -73,12 +73,12 @@ class uniform_real_distribution {
: lo_(lo), hi_(hi), range_(hi - lo) {
// [rand.dist.uni.real] preconditions 2 & 3
assert(lo <= hi);
+
// NOTE: For integral types, we can promote the range to an unsigned type,
// which gives full width of the range. However for real (fp) types, this
// is not possible, so value generation cannot use the full range of the
// real type.
assert(range_ <= (std::numeric_limits<result_type>::max)());
- assert(std::isfinite(range_));
}
result_type a() const { return lo_; }
diff --git a/absl/random/uniform_real_distribution_test.cc b/absl/random/uniform_real_distribution_test.cc
index 035bd284..07f199d3 100644
--- a/absl/random/uniform_real_distribution_test.cc
+++ b/absl/random/uniform_real_distribution_test.cc
@@ -78,62 +78,74 @@ TYPED_TEST(UniformRealDistributionTest, ParamSerializeTest) {
GTEST_SKIP()
<< "Skipping the test because we detected x87 floating-point semantics";
#endif
+ using DistributionType = absl::uniform_real_distribution<TypeParam>;
+ using real_type = TypeParam;
+ using param_type = typename DistributionType::param_type;
- using param_type =
- typename absl::uniform_real_distribution<TypeParam>::param_type;
+ constexpr const real_type kMax = std::numeric_limits<real_type>::max();
+ constexpr const real_type kMin = std::numeric_limits<real_type>::min();
+ constexpr const real_type kEpsilon =
+ std::numeric_limits<real_type>::epsilon();
+ constexpr const real_type kLowest =
+ std::numeric_limits<real_type>::lowest(); // -max
- constexpr const TypeParam a{1152921504606846976};
+ const real_type kDenormMax = std::nextafter(kMin, real_type{0});
+ const real_type kOneMinusE =
+ std::nextafter(real_type{1}, real_type{0}); // 1 - epsilon
+
+ constexpr const real_type kTwo60{1152921504606846976}; // 2^60
constexpr int kCount = 1000;
absl::InsecureBitGen gen;
for (const auto& param : {
param_type(),
- param_type(TypeParam(2.0), TypeParam(2.0)), // Same
- param_type(TypeParam(-0.1), TypeParam(0.1)),
- param_type(TypeParam(0.05), TypeParam(0.12)),
- param_type(TypeParam(-0.05), TypeParam(0.13)),
- param_type(TypeParam(-0.05), TypeParam(-0.02)),
+ param_type(real_type{0}, real_type{1}),
+ param_type(real_type(-0.1), real_type(0.1)),
+ param_type(real_type(0.05), real_type(0.12)),
+ param_type(real_type(-0.05), real_type(0.13)),
+ param_type(real_type(-0.05), real_type(-0.02)),
+ // range = 0
+ param_type(real_type(2.0), real_type(2.0)), // Same
// double range = 0
// 2^60 , 2^60 + 2^6
- param_type(a, TypeParam(1152921504606847040)),
+ param_type(kTwo60, real_type(1152921504606847040)),
// 2^60 , 2^60 + 2^7
- param_type(a, TypeParam(1152921504606847104)),
+ param_type(kTwo60, real_type(1152921504606847104)),
// double range = 2^8
// 2^60 , 2^60 + 2^8
- param_type(a, TypeParam(1152921504606847232)),
+ param_type(kTwo60, real_type(1152921504606847232)),
// float range = 0
// 2^60 , 2^60 + 2^36
- param_type(a, TypeParam(1152921573326323712)),
+ param_type(kTwo60, real_type(1152921573326323712)),
// 2^60 , 2^60 + 2^37
- param_type(a, TypeParam(1152921642045800448)),
+ param_type(kTwo60, real_type(1152921642045800448)),
// float range = 2^38
// 2^60 , 2^60 + 2^38
- param_type(a, TypeParam(1152921779484753920)),
+ param_type(kTwo60, real_type(1152921779484753920)),
// Limits
- param_type(0, std::numeric_limits<TypeParam>::max()),
- param_type(std::numeric_limits<TypeParam>::lowest(), 0),
- param_type(0, std::numeric_limits<TypeParam>::epsilon()),
- param_type(-std::numeric_limits<TypeParam>::epsilon(),
- std::numeric_limits<TypeParam>::epsilon()),
- param_type(std::numeric_limits<TypeParam>::epsilon(),
- 2 * std::numeric_limits<TypeParam>::epsilon()),
+ param_type(0, kMax),
+ param_type(kLowest, 0),
+ param_type(0, kMin),
+ param_type(0, kEpsilon),
+ param_type(-kEpsilon, kEpsilon),
+ param_type(0, kOneMinusE),
+ param_type(0, kDenormMax),
}) {
// Validate parameters.
const auto a = param.a();
const auto b = param.b();
- absl::uniform_real_distribution<TypeParam> before(a, b);
+ DistributionType before(a, b);
EXPECT_EQ(before.a(), param.a());
EXPECT_EQ(before.b(), param.b());
{
- absl::uniform_real_distribution<TypeParam> via_param(param);
+ DistributionType via_param(param);
EXPECT_EQ(via_param, before);
}
std::stringstream ss;
ss << before;
- absl::uniform_real_distribution<TypeParam> after(TypeParam(1.0),
- TypeParam(3.1));
+ DistributionType after(real_type(1.0), real_type(3.1));
EXPECT_NE(before.a(), after.a());
EXPECT_NE(before.b(), after.b());
@@ -168,7 +180,7 @@ TYPED_TEST(UniformRealDistributionTest, ParamSerializeTest) {
}
}
- if (!std::is_same<TypeParam, long double>::value) {
+ if (!std::is_same<real_type, long double>::value) {
// static_cast<double>(long double) can overflow.
std::string msg = absl::StrCat("Range: ", static_cast<double>(sample_min),
", ", static_cast<double>(sample_max));
@@ -182,33 +194,52 @@ TYPED_TEST(UniformRealDistributionTest, ParamSerializeTest) {
#pragma warning(disable:4756) // Constant arithmetic overflow.
#endif
TYPED_TEST(UniformRealDistributionTest, ViolatesPreconditionsDeathTest) {
+ using DistributionType = absl::uniform_real_distribution<TypeParam>;
+ using real_type = TypeParam;
+
#if GTEST_HAS_DEATH_TEST
// Hi < Lo
- EXPECT_DEBUG_DEATH(
- { absl::uniform_real_distribution<TypeParam> dist(10.0, 1.0); }, "");
+ EXPECT_DEBUG_DEATH({ DistributionType dist(10.0, 1.0); }, "");
// Hi - Lo > numeric_limits<>::max()
EXPECT_DEBUG_DEATH(
{
- absl::uniform_real_distribution<TypeParam> dist(
- std::numeric_limits<TypeParam>::lowest(),
- std::numeric_limits<TypeParam>::max());
+ DistributionType dist(std::numeric_limits<real_type>::lowest(),
+ std::numeric_limits<real_type>::max());
+ },
+ "");
+
+ // kEpsilon guarantees that max + kEpsilon = inf.
+ const auto kEpsilon = std::nexttoward(
+ (std::numeric_limits<real_type>::max() -
+ std::nexttoward(std::numeric_limits<real_type>::max(), 0.0)) /
+ 2,
+ std::numeric_limits<real_type>::max());
+ EXPECT_DEBUG_DEATH(
+ {
+ DistributionType dist(-kEpsilon, std::numeric_limits<real_type>::max());
},
"");
+ EXPECT_DEBUG_DEATH(
+ {
+ DistributionType dist(std::numeric_limits<real_type>::lowest(),
+ kEpsilon);
+ },
+ "");
+
#endif // GTEST_HAS_DEATH_TEST
#if defined(NDEBUG)
// opt-mode, for invalid parameters, will generate a garbage value,
// but should not enter an infinite loop.
absl::InsecureBitGen gen;
{
- absl::uniform_real_distribution<TypeParam> dist(10.0, 1.0);
+ DistributionType dist(10.0, 1.0);
auto x = dist(gen);
EXPECT_FALSE(std::isnan(x)) << x;
}
{
- absl::uniform_real_distribution<TypeParam> dist(
- std::numeric_limits<TypeParam>::lowest(),
- std::numeric_limits<TypeParam>::max());
+ DistributionType dist(std::numeric_limits<real_type>::lowest(),
+ std::numeric_limits<real_type>::max());
auto x = dist(gen);
// Infinite result.
EXPECT_FALSE(std::isfinite(x)) << x;
@@ -220,6 +251,8 @@ TYPED_TEST(UniformRealDistributionTest, ViolatesPreconditionsDeathTest) {
#endif
TYPED_TEST(UniformRealDistributionTest, TestMoments) {
+ using DistributionType = absl::uniform_real_distribution<TypeParam>;
+
constexpr int kSize = 1000000;
std::vector<double> values(kSize);
@@ -228,7 +261,7 @@ TYPED_TEST(UniformRealDistributionTest, TestMoments) {
// implementation.
absl::random_internal::pcg64_2018_engine rng{0x2B7E151628AED2A6};
- absl::uniform_real_distribution<TypeParam> dist;
+ DistributionType dist;
for (int i = 0; i < kSize; i++) {
values[i] = dist(rng);
}
@@ -242,9 +275,10 @@ TYPED_TEST(UniformRealDistributionTest, TestMoments) {
}
TYPED_TEST(UniformRealDistributionTest, ChiSquaredTest50) {
+ using DistributionType = absl::uniform_real_distribution<TypeParam>;
+ using param_type = typename DistributionType::param_type;
+
using absl::random_internal::kChiSquared;
- using param_type =
- typename absl::uniform_real_distribution<TypeParam>::param_type;
constexpr size_t kTrials = 100000;
constexpr int kBuckets = 50;
@@ -269,7 +303,7 @@ TYPED_TEST(UniformRealDistributionTest, ChiSquaredTest50) {
const double factor = kBuckets / (max_val - min_val);
std::vector<int32_t> counts(kBuckets, 0);
- absl::uniform_real_distribution<TypeParam> dist(param);
+ DistributionType dist(param);
for (size_t i = 0; i < kTrials; i++) {
auto x = dist(rng);
auto bucket = static_cast<size_t>((x - min_val) * factor);
@@ -297,8 +331,11 @@ TYPED_TEST(UniformRealDistributionTest, ChiSquaredTest50) {
}
TYPED_TEST(UniformRealDistributionTest, StabilityTest) {
+ using DistributionType = absl::uniform_real_distribution<TypeParam>;
+ using real_type = TypeParam;
+
// absl::uniform_real_distribution stability relies only on
- // random_internal::RandU64ToDouble and random_internal::RandU64ToFloat.
+ // random_internal::GenerateRealFromBits.
absl::random_internal::sequence_urbg urbg(
{0x0003eb76f6f7f755ull, 0xFFCEA50FDB2F953Bull, 0xC332DDEFBE6C5AA5ull,
0x6558218568AB9702ull, 0x2AEF7DAD5B6E2F84ull, 0x1521B62829076170ull,
@@ -307,9 +344,9 @@ TYPED_TEST(UniformRealDistributionTest, StabilityTest) {
std::vector<int> output(12);
- absl::uniform_real_distribution<TypeParam> dist;
+ DistributionType dist;
std::generate(std::begin(output), std::end(output), [&] {
- return static_cast<int>(TypeParam(1000000) * dist(urbg));
+ return static_cast<int>(real_type(1000000) * dist(urbg));
});
EXPECT_THAT(
diff --git a/absl/status/status.h b/absl/status/status.h
index 2d003ce6..193db8d8 100644
--- a/absl/status/status.h
+++ b/absl/status/status.h
@@ -613,10 +613,6 @@ class Status final {
const status_internal::Payloads* GetPayloads() const;
status_internal::Payloads* GetPayloads();
- // Takes ownership of payload.
- static uintptr_t NewRep(
- absl::StatusCode code, absl::string_view msg,
- std::unique_ptr<status_internal::Payloads> payload);
static bool EqualsSlow(const absl::Status& a, const absl::Status& b);
// MSVC 14.0 limitation requires the const.
diff --git a/absl/strings/cord.h b/absl/strings/cord.h
index 081b6311..5ad4ea0c 100644
--- a/absl/strings/cord.h
+++ b/absl/strings/cord.h
@@ -768,6 +768,7 @@ class Cord {
// Returns nullptr if holding bytes
absl::cord_internal::CordRep* tree() const;
absl::cord_internal::CordRep* as_tree() const;
+ const char* as_chars() const;
// Returns non-null iff was holding a pointer
absl::cord_internal::CordRep* clear();
// Converts to pointer if necessary.
@@ -1094,6 +1095,11 @@ inline const char* Cord::InlineRep::data() const {
return is_tree() ? nullptr : data_.as_chars();
}
+inline const char* Cord::InlineRep::as_chars() const {
+ assert(!data_.is_tree());
+ return data_.as_chars();
+}
+
inline absl::cord_internal::CordRep* Cord::InlineRep::as_tree() const {
assert(data_.is_tree());
return data_.as_tree();
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-20 06:09:39 +0000