diff options
30 files changed, 1104 insertions, 361 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt index 77ae631d0e81..1eafa4078a75 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -17,6 +17,12 @@ # We require 3.0 for modern, target-based CMake. We require 3.1 for the use of # CXX_STANDARD in our targets. cmake_minimum_required(VERSION 3.1) + +# Compiler id for Apple Clang is now AppleClang. +if (POLICY CMP0025) + cmake_policy(SET CMP0025 NEW) +endif() + project(absl) list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/CMake) @@ -68,6 +74,12 @@ set(CMAKE_CXX_FLAGS "${ABSL_STD_CXX_FLAG} ${CMAKE_CXX_FLAGS}") # -fexceptions set(ABSL_EXCEPTIONS_FLAG "${CMAKE_CXX_EXCEPTIONS}") +if("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang") + set(ABSL_USING_CLANG ON) +else() + set(ABSL_USING_CLANG OFF) +endif() + # find dependencies ## pthread find_package(Threads REQUIRED) diff --git a/absl/base/BUILD.bazel b/absl/base/BUILD.bazel index 44de05e3e094..4566c697cfdd 100644 --- a/absl/base/BUILD.bazel +++ b/absl/base/BUILD.bazel @@ -107,6 +107,7 @@ cc_library( "internal/identity.h", "internal/inline_variable.h", "internal/invoke.h", + "internal/scheduling_mode.h", ], copts = ABSL_DEFAULT_COPTS, visibility = [ @@ -314,6 +315,33 @@ cc_test( ) cc_library( + name = "spinlock_benchmark_common", + testonly = 1, + srcs = ["internal/spinlock_benchmark.cc"], + copts = ABSL_DEFAULT_COPTS, + visibility = [ + "//absl/base:__pkg__", + ], + deps = [ + ":base", + ":base_internal", + "//absl/synchronization", + "@com_github_google_benchmark//:benchmark_main", + ], + alwayslink = 1, +) + +cc_binary( + name = "spinlock_benchmark", + testonly = 1, + copts = ABSL_DEFAULT_COPTS, + visibility = ["//visibility:private"], + deps = [ + ":spinlock_benchmark_common", + ], +) + +cc_library( name = "endian", hdrs = [ "internal/endian.h", diff --git a/absl/base/internal/spinlock.h b/absl/base/internal/spinlock.h index dcce01092235..eb3eec9cd0a1 100644 --- a/absl/base/internal/spinlock.h +++ b/absl/base/internal/spinlock.h @@ -101,8 +101,8 @@ class LOCKABLE SpinLock { inline void Unlock() UNLOCK_FUNCTION() { ABSL_TSAN_MUTEX_PRE_UNLOCK(this, 0); uint32_t lock_value = lockword_.load(std::memory_order_relaxed); - lockword_.store(lock_value & kSpinLockCooperative, - std::memory_order_release); + lock_value = lockword_.exchange(lock_value & kSpinLockCooperative, + std::memory_order_release); if ((lock_value & kSpinLockDisabledScheduling) != 0) { base_internal::SchedulingGuard::EnableRescheduling(true); diff --git a/absl/base/internal/spinlock_benchmark.cc b/absl/base/internal/spinlock_benchmark.cc new file mode 100644 index 000000000000..907d3e2745b3 --- /dev/null +++ b/absl/base/internal/spinlock_benchmark.cc @@ -0,0 +1,52 @@ +// Copyright 2018 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 +// +// http://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. + +// See also //absl/synchronization:mutex_benchmark for a comparison of SpinLock +// and Mutex performance under varying levels of contention. + +#include "absl/base/internal/raw_logging.h" +#include "absl/base/internal/scheduling_mode.h" +#include "absl/base/internal/spinlock.h" +#include "absl/synchronization/internal/create_thread_identity.h" +#include "benchmark/benchmark.h" + +namespace { + +template <absl::base_internal::SchedulingMode scheduling_mode> +static void BM_SpinLock(benchmark::State& state) { + // Ensure a ThreadIdentity is installed. + ABSL_INTERNAL_CHECK( + absl::synchronization_internal::GetOrCreateCurrentThreadIdentity() != + nullptr, + "GetOrCreateCurrentThreadIdentity() failed"); + + static auto* spinlock = new absl::base_internal::SpinLock(scheduling_mode); + for (auto _ : state) { + absl::base_internal::SpinLockHolder holder(spinlock); + } +} + +BENCHMARK_TEMPLATE(BM_SpinLock, + absl::base_internal::SCHEDULE_KERNEL_ONLY) + ->UseRealTime() + ->Threads(1) + ->ThreadPerCpu(); + +BENCHMARK_TEMPLATE(BM_SpinLock, + absl::base_internal::SCHEDULE_COOPERATIVE_AND_KERNEL) + ->UseRealTime() + ->Threads(1) + ->ThreadPerCpu(); + +} // namespace diff --git a/absl/container/CMakeLists.txt b/absl/container/CMakeLists.txt index 7cddd84bd693..8605facc2e2d 100644 --- a/absl/container/CMakeLists.txt +++ b/absl/container/CMakeLists.txt @@ -30,7 +30,7 @@ absl_cc_library( absl_cc_library( NAME compressed_tuple - SRCS + HDRS "internal/compressed_tuple.h" DEPS absl::utility diff --git a/absl/container/flat_hash_set.h b/absl/container/flat_hash_set.h index 5ea6a81652d0..84984cc4927b 100644 --- a/absl/container/flat_hash_set.h +++ b/absl/container/flat_hash_set.h @@ -279,8 +279,7 @@ class flat_hash_set // // The element may be constructed even if there already is an element with the // key in the container, in which case the newly constructed element will be - // destroyed immediately. Prefer `try_emplace()` unless your key is not - // copyable or moveable. + // destroyed immediately. // // If rehashing occurs due to the insertion, all iterators are invalidated. using Base::emplace; @@ -294,8 +293,7 @@ class flat_hash_set // // The element may be constructed even if there already is an element with the // key in the container, in which case the newly constructed element will be - // destroyed immediately. Prefer `try_emplace()` unless your key is not - // copyable or moveable. + // destroyed immediately. // // If rehashing occurs due to the insertion, all iterators are invalidated. using Base::emplace_hint; diff --git a/absl/container/inlined_vector.h b/absl/container/inlined_vector.h index 642dae6cb907..5f3f0095bca8 100644 --- a/absl/container/inlined_vector.h +++ b/absl/container/inlined_vector.h @@ -66,12 +66,11 @@ namespace absl { // designed to cover the same API footprint as covered by `std::vector`. template <typename T, size_t N, typename A = std::allocator<T>> class InlinedVector { + static_assert(N > 0, "InlinedVector requires inline capacity greater than 0"); constexpr static typename A::size_type inlined_capacity() { return static_cast<typename A::size_type>(N); } - static_assert(inlined_capacity() > 0, "InlinedVector needs inlined capacity"); - template <typename Iterator> using DisableIfIntegral = absl::enable_if_t<!std::is_integral<Iterator>::value>; @@ -131,7 +130,8 @@ class InlinedVector { InlinedVector(std::initializer_list<value_type> init_list, const allocator_type& alloc = allocator_type()) : allocator_and_tag_(alloc) { - AppendRange(init_list.begin(), init_list.end()); + AppendRange(init_list.begin(), init_list.end(), + IteratorCategory<decltype(init_list.begin())>{}); } // Creates an inlined vector with elements constructed from the provided @@ -144,7 +144,7 @@ class InlinedVector { InlinedVector(InputIterator first, InputIterator last, const allocator_type& alloc = allocator_type()) : allocator_and_tag_(alloc) { - AppendRange(first, last); + AppendRange(first, last, IteratorCategory<InputIterator>{}); } // Creates a copy of `other` using `other`'s allocator. @@ -366,7 +366,6 @@ class InlinedVector { // Returns a copy of the allocator of the inlined vector. allocator_type get_allocator() const { return allocator(); } - // --------------------------------------------------------------------------- // InlinedVector Member Mutators // --------------------------------------------------------------------------- @@ -376,7 +375,8 @@ class InlinedVector { // Replaces the contents of the inlined vector with copies of the elements in // the provided `std::initializer_list`. InlinedVector& operator=(std::initializer_list<value_type> init_list) { - AssignRange(init_list.begin(), init_list.end()); + AssignRange(init_list.begin(), init_list.end(), + IteratorCategory<decltype(init_list.begin())>{}); return *this; } @@ -453,14 +453,15 @@ class InlinedVector { // inlined vector with copies of the values in the provided // `std::initializer_list`. void assign(std::initializer_list<value_type> init_list) { - AssignRange(init_list.begin(), init_list.end()); + AssignRange(init_list.begin(), init_list.end(), + IteratorCategory<decltype(init_list.begin())>{}); } // Overload of `InlinedVector::assign()` to replace the contents of the // inlined vector with values constructed from the range [`first`, `last`). template <typename InputIterator, DisableIfIntegral<InputIterator>* = nullptr> void assign(InputIterator first, InputIterator last) { - AssignRange(first, last); + AssignRange(first, last, IteratorCategory<InputIterator>{}); } // `InlinedVector::resize()` @@ -845,40 +846,28 @@ class InlinedVector { void Destroy(pointer from, pointer to); template <typename Iterator> - void AppendRange(Iterator first, Iterator last, std::input_iterator_tag) { - std::copy(first, last, std::back_inserter(*this)); - } - - template <typename Iterator> void AppendRange(Iterator first, Iterator last, std::forward_iterator_tag); template <typename Iterator> - void AppendRange(Iterator first, Iterator last) { - AppendRange(first, last, IteratorCategory<Iterator>()); - } - - template <typename Iterator> - void AssignRange(Iterator first, Iterator last, std::input_iterator_tag); + void AppendRange(Iterator first, Iterator last, std::input_iterator_tag); template <typename Iterator> void AssignRange(Iterator first, Iterator last, std::forward_iterator_tag); template <typename Iterator> - void AssignRange(Iterator first, Iterator last) { - AssignRange(first, last, IteratorCategory<Iterator>()); - } + void AssignRange(Iterator first, Iterator last, std::input_iterator_tag); iterator InsertWithCount(const_iterator position, size_type n, const_reference v); - template <typename InputIterator> - iterator InsertWithRange(const_iterator position, InputIterator first, - InputIterator last, std::input_iterator_tag); - template <typename ForwardIterator> iterator InsertWithRange(const_iterator position, ForwardIterator first, ForwardIterator last, std::forward_iterator_tag); + template <typename InputIterator> + iterator InsertWithRange(const_iterator position, InputIterator first, + InputIterator last, std::input_iterator_tag); + // Stores either the inlined or allocated representation union Rep { using ValueTypeBuffer = @@ -889,7 +878,7 @@ class InlinedVector { // Structs wrap the buffers to perform indirection that solves a bizarre // compilation error on Visual Studio (all known versions). struct InlinedRep { - ValueTypeBuffer inlined[inlined_capacity()]; + ValueTypeBuffer inlined[N]; }; struct AllocatedRep { AllocationBuffer allocation; @@ -1364,15 +1353,8 @@ void InlinedVector<T, N, A>::AppendRange(Iterator first, Iterator last, template <typename T, size_t N, typename A> template <typename Iterator> -void InlinedVector<T, N, A>::AssignRange(Iterator first, Iterator last, +void InlinedVector<T, N, A>::AppendRange(Iterator first, Iterator last, std::input_iterator_tag) { - // Optimized to avoid reallocation. - // Prefer reassignment to copy construction for elements. - iterator out = begin(); - for (; first != last && out != end(); ++first, ++out) { - *out = *first; - } - erase(out, end()); std::copy(first, last, std::back_inserter(*this)); } @@ -1399,6 +1381,20 @@ void InlinedVector<T, N, A>::AssignRange(Iterator first, Iterator last, } template <typename T, size_t N, typename A> +template <typename Iterator> +void InlinedVector<T, N, A>::AssignRange(Iterator first, Iterator last, + std::input_iterator_tag) { + // Optimized to avoid reallocation. + // Prefer reassignment to copy construction for elements. + iterator out = begin(); + for (; first != last && out != end(); ++first, ++out) { + *out = *first; + } + erase(out, end()); + std::copy(first, last, std::back_inserter(*this)); +} + +template <typename T, size_t N, typename A> auto InlinedVector<T, N, A>::InsertWithCount(const_iterator position, size_type n, const_reference v) -> iterator { @@ -1414,20 +1410,6 @@ auto InlinedVector<T, N, A>::InsertWithCount(const_iterator position, } template <typename T, size_t N, typename A> -template <typename InputIterator> -auto InlinedVector<T, N, A>::InsertWithRange(const_iterator position, - InputIterator first, - InputIterator last, - std::input_iterator_tag) - -> iterator { - assert(position >= begin() && position <= end()); - size_type index = position - cbegin(); - size_type i = index; - while (first != last) insert(begin() + i++, *first++); - return begin() + index; -} - -template <typename T, size_t N, typename A> template <typename ForwardIterator> auto InlinedVector<T, N, A>::InsertWithRange(const_iterator position, ForwardIterator first, @@ -1446,6 +1428,20 @@ auto InlinedVector<T, N, A>::InsertWithRange(const_iterator position, return it_pair.first; } +template <typename T, size_t N, typename A> +template <typename InputIterator> +auto InlinedVector<T, N, A>::InsertWithRange(const_iterator position, + InputIterator first, + InputIterator last, + std::input_iterator_tag) + -> iterator { + assert(position >= begin() && position <= end()); + size_type index = position - cbegin(); + size_type i = index; + while (first != last) insert(begin() + i++, *first++); + return begin() + index; +} + } // namespace absl #endif // ABSL_CONTAINER_INLINED_VECTOR_H_ diff --git a/absl/container/internal/layout.h b/absl/container/internal/layout.h index a9c1244a4e79..3d21ac963b45 100644 --- a/absl/container/internal/layout.h +++ b/absl/container/internal/layout.h @@ -253,8 +253,10 @@ template <class From, class To> using CopyConst = typename std::conditional<std::is_const<From>::value, const To, To>::type; +// Note: We're not qualifying this with absl:: because it doesn't compile under +// MSVC. template <class T> -using SliceType = absl::Span<T>; +using SliceType = Span<T>; // This namespace contains no types. It prevents functions defined in it from // being found by ADL. diff --git a/absl/container/internal/raw_hash_set.cc b/absl/container/internal/raw_hash_set.cc index 10153129fd1e..180d3fe5a91f 100644 --- a/absl/container/internal/raw_hash_set.cc +++ b/absl/container/internal/raw_hash_set.cc @@ -14,6 +14,7 @@ #include "absl/container/internal/raw_hash_set.h" +#include <atomic> #include <cstddef> #include "absl/base/config.h" @@ -29,7 +30,7 @@ inline size_t RandomSeed() { static thread_local size_t counter = 0; size_t value = ++counter; #else // ABSL_HAVE_THREAD_LOCAL - static std::atomic<size_t> counter; + static std::atomic<size_t> counter(0); size_t value = counter.fetch_add(1, std::memory_order_relaxed); #endif // ABSL_HAVE_THREAD_LOCAL return value ^ static_cast<size_t>(reinterpret_cast<uintptr_t>(&counter)); diff --git a/absl/container/node_hash_set.h b/absl/container/node_hash_set.h index e4034461a011..843b11aa58ad 100644 --- a/absl/container/node_hash_set.h +++ b/absl/container/node_hash_set.h @@ -273,8 +273,7 @@ class node_hash_set // // The element may be constructed even if there already is an element with the // key in the container, in which case the newly constructed element will be - // destroyed immediately. Prefer `try_emplace()` unless your key is not - // copyable or moveable. + // destroyed immediately. // // If rehashing occurs due to the insertion, all iterators are invalidated. using Base::emplace; @@ -288,8 +287,7 @@ class node_hash_set // // The element may be constructed even if there already is an element with the // key in the container, in which case the newly constructed element will be - // destroyed immediately. Prefer `try_emplace()` unless your key is not - // copyable or moveable. + // destroyed immediately. // // If rehashing occurs due to the insertion, all iterators are invalidated. using Base::emplace_hint; diff --git a/absl/debugging/CMakeLists.txt b/absl/debugging/CMakeLists.txt index c28eb14bcc28..f66688ba5bf0 100644 --- a/absl/debugging/CMakeLists.txt +++ b/absl/debugging/CMakeLists.txt @@ -14,204 +14,297 @@ # limitations under the License. # -list(APPEND DEBUGGING_PUBLIC_HEADERS - "failure_signal_handler.h" - "leak_check.h" - "stacktrace.h" - "symbolize.h" -) - -# TODO(cohenjon) The below is all kinds of wrong. Make this match what we do in -# Bazel -list(APPEND DEBUGGING_INTERNAL_HEADERS - "internal/address_is_readable.h" - "internal/demangle.h" - "internal/elf_mem_image.h" - "internal/examine_stack.h" - "internal/stacktrace_config.h" - "internal/symbolize.h" - "internal/vdso_support.h" -) - -list(APPEND DEBUGGING_INTERNAL_SRC - "internal/address_is_readable.cc" - "internal/elf_mem_image.cc" - "internal/vdso_support.cc" -) - - -list(APPEND STACKTRACE_SRC - "stacktrace.cc" - ${DEBUGGING_INTERNAL_SRC} - ${DEBUGGING_PUBLIC_HEADERS} - ${DEBUGGING_INTERNAL_HEADERS} +absl_cc_library( + NAME + stacktrace + HDRS + "stacktrace.h" + SRCS + "stacktrace.cc" + COPTS + ${ABSL_DEFAULT_COPTS} + DEPS + absl::debugging_internal + absl::base + absl::core_headers + PUBLIC ) -list(APPEND SYMBOLIZE_SRC - "symbolize.cc" - "symbolize_elf.inc" - "symbolize_unimplemented.inc" - "symbolize_win32.inc" - "internal/demangle.cc" - ${DEBUGGING_PUBLIC_HEADERS} - ${DEBUGGING_INTERNAL_HEADERS} - ${DEBUGGING_INTERNAL_SRC} +absl_cc_library( + NAME + symbolize + HDRS + "symbolize.h" + "internal/symbolize.h" + SRCS + "symbolize.cc" + "symbolize_elf.inc" + "symbolize_unimplemented.inc" + "symbolize_win32.inc" + COPTS + ${ABSL_DEFAULT_COPTS} + DEPS + absl::debugging_internal + absl::demangle_internal + absl::base + absl::core_headers + absl::malloc_internal + PUBLIC ) -list(APPEND FAILURE_SIGNAL_HANDLER_SRC - "failure_signal_handler.cc" - ${DEBUGGING_PUBLIC_HEADERS} +absl_cc_test( + NAME + symbolize_test + SRCS + "symbolize_test.cc" + COPTS + ${ABSL_TEST_COPTS} + DEPS + absl::stack_consumption + absl::symbolize + absl::base + absl::core_headers + absl::memory + gmock ) -list(APPEND EXAMINE_STACK_SRC - "internal/examine_stack.cc" - ${DEBUGGING_PUBLIC_HEADERS} - ${DEBUGGING_INTERNAL_HEADERS} +absl_cc_library( + NAME + examine_stack + HDRS + "internal/examine_stack.h" + SRCS + "internal/examine_stack.cc" + COPTS + ${ABSL_DEFAULT_COPTS} + DEPS + absl::stacktrace + absl::symbolize + absl::base + absl::core_headers ) -absl_library( - TARGET - absl_stacktrace - SOURCES - ${STACKTRACE_SRC} - EXPORT_NAME - stacktrace +absl_cc_library( + NAME + failure_signal_handler + HDRS + "failure_signal_handler.h" + SRCS + "failure_signal_handler.cc" + COPTS + ${ABSL_DEFAULT_COPTS} + DEPS + absl::examine_stack + absl::stacktrace + absl::base + absl::config + absl::core_headers + PUBLIC ) -absl_library( - TARGET - absl_symbolize - SOURCES - ${SYMBOLIZE_SRC} - PUBLIC_LIBRARIES +absl_cc_test( + NAME + failure_signal_handler_test + SRCS + "failure_signal_handler_test.cc" + COPTS + ${ABSL_TEST_COPTS} + DEPS + absl::failure_signal_handler + absl::stacktrace + absl::symbolize absl::base - absl::malloc_internal - EXPORT_NAME - symbolize + absl::strings + Threads::Threads + gmock ) -absl_library( - TARGET - absl_failure_signal_handler - SOURCES - ${FAILURE_SIGNAL_HANDLER_SRC} - PUBLIC_LIBRARIES - absl_base absl::examine_stack absl::stacktrace absl_synchronization - EXPORT_NAME - failure_signal_handler +absl_cc_library( + NAME + debugging_internal + HDRS + "internal/address_is_readable.h" + "internal/elf_mem_image.h" + "internal/stacktrace_aarch64-inl.inc" + "internal/stacktrace_arm-inl.inc" + "internal/stacktrace_config.h" + "internal/stacktrace_generic-inl.inc" + "internal/stacktrace_powerpc-inl.inc" + "internal/stacktrace_unimplemented-inl.inc" + "internal/stacktrace_win32-inl.inc" + "internal/stacktrace_x86-inl.inc" + "internal/vdso_support.h" + SRCS + "internal/address_is_readable.cc" + "internal/elf_mem_image.cc" + "internal/vdso_support.cc" + COPTS + ${ABSL_DEFAULT_COPTS} + DEPS + absl::base + absl::core_headers + absl::dynamic_annotations ) -# Internal-only. Projects external to Abseil should not depend -# directly on this library. -absl_library( - TARGET - absl_examine_stack - SOURCES - ${EXAMINE_STACK_SRC} - EXPORT_NAME - examine_stack +absl_cc_library( + NAME + demangle_internal + HDRS + "internal/demangle.h" + SRCS + "internal/demangle.cc" + COPTS + ${ABSL_DEFAULT_COPTS} + DEPS + absl::base + absl::core_headers + PUBLIC ) -list(APPEND LEAK_CHECK_SRC - "leak_check.cc" +absl_cc_test( + NAME + demangle_test + SRCS + "internal/demangle_test.cc" + COPTS + ${ABSL_TEST_COPTS} + DEPS + absl::demangle_internal + absl::stack_consumption + absl::base + absl::core_headers + absl::memory + gmock_main ) - -# leak_check library -absl_library( - TARGET - absl_leak_check - SOURCES - ${LEAK_CHECK_SRC} - PUBLIC_LIBRARIES - absl_base - EXPORT_NAME +absl_cc_library( + NAME leak_check + HDRS + "$<$<NOT:$<CXX_COMPILER_ID:MSVC>>:leak_check.h>" + SRCS + "$<$<NOT:$<CXX_COMPILER_ID:MSVC>>:leak_check.cc>" + COPTS + ${ABSL_DEFAULT_COPTS} + DEPS + absl::core_headers + PUBLIC ) - -# component target -absl_header_library( - TARGET - absl_debugging - PUBLIC_LIBRARIES - absl_stacktrace absl_leak_check - EXPORT_NAME - debugging +absl_cc_library( + NAME + leak_check_disable + SRCS + "leak_check_disable.cc" + PUBLIC ) -# -## TESTS -# +# TODO(cohenjon) Move into the copts code. +if(CMAKE_CXX_COMPILER_ID MATCHES "Clang") + set(ABSL_LSAN_LINKOPTS "-fsanitize=leak") +endif() -list(APPEND STACK_CONSUMPTION_SRC - "internal/stack_consumption.cc" - "internal/stack_consumption.h" +absl_cc_library( + NAME + leak_check_api_enabled_for_testing + HDRS + "leak_check.h" + SRCS + "leak_check.cc" + COPTS + $<$<BOOL:${ABSL_USING_CLANG}>:-DLEAK_SANITIZER> + TESTONLY ) -absl_library( - TARGET - absl_stack_consumption - SOURCES - ${STACK_CONSUMPTION_SRC} +absl_cc_library( + NAME + leak_check_api_disabled_for_testing + HDRS + "leak_check.h" + SRCS + "leak_check.cc" + COPTS + "-ULEAK_SANITIZER" + TESTONLY ) -absl_test( - TARGET - absl_stack_consumption_test - SOURCES - "internal/stack_consumption_test.cc" - PUBLIC_LIBRARIES - absl_stack_consumption +absl_cc_test( + NAME + leak_check_test + SRCS + "leak_check_test.cc" + COPTS + "$<$<CXX_COMPILER_ID:Clang>:-DABSL_EXPECT_LEAK_SANITIZER>" + LINKOPTS + "${ABSL_LSAN_LINKOPTS}" + DEPS + absl::leak_check_api_enabled_for_testing absl::base + gmock_main ) -list(APPEND DEMANGLE_TEST_SRC "internal/demangle_test.cc") - -absl_test( - TARGET - demangle_test - SOURCES - ${DEMANGLE_TEST_SRC} - PUBLIC_LIBRARIES - absl_symbolize absl_stack_consumption +absl_cc_test( + NAME + leak_check_no_lsan_test + SRCS + "leak_check_test.cc" + COPTS + "-UABSL_EXPECT_LEAK_SANITIZER" + DEPS + absl::leak_check_api_disabled_for_testing + absl::base + gmock_main ) -list(APPEND SYMBOLIZE_TEST_SRC "symbolize_test.cc") - -absl_test( - TARGET - symbolize_test - SOURCES - ${SYMBOLIZE_TEST_SRC} - PUBLIC_LIBRARIES - absl::base absl::memory absl_symbolize absl_stack_consumption +absl_cc_test( + NAME + disabled_leak_check_test + SRCS + "leak_check_fail_test.cc" + LINKOPTS + "${ABSL_LSAN_LINKOPTS}" + DEPS + absl::leak_check_api_enabled_for_testing + absl::leak_check_disable + absl::base + gmock_main ) -list(APPEND FAILURE_SIGNAL_HANDLER_TEST_SRC "failure_signal_handler_test.cc") - -absl_test( - TARGET - failure_signal_handler_test - SOURCES - ${FAILURE_SIGNAL_HANDLER_TEST_SRC} - PUBLIC_LIBRARIES - absl_examine_stack - absl_failure_signal_handler - absl_stacktrace - absl_symbolize +absl_cc_library( + NAME + stack_consumption + HDRS + "internal/stack_consumption.h" + SRCS + "internal/stack_consumption.cc" + COPTS + ${ABSL_DEFAULT_COPTS} + DEPS absl::base - absl::strings + absl::core_headers + TESTONLY ) -# test leak_check_test -list(APPEND LEAK_CHECK_TEST_SRC "leak_check_test.cc") +absl_cc_test( + NAME + stack_consumption_test + SRCS + "internal/stack_consumption_test.cc" + COPTS + ${ABSL_TEST_COPTS} + DEPS + absl::stack_consumption + absl::base + absl::core_headers + gmock_main +) -absl_test( - TARGET - leak_check_test - SOURCES - ${LEAK_CHECK_TEST_SRC} - PUBLIC_LIBRARIES - absl_leak_check +# component target +absl_cc_library( + NAME + debugging + DEPS + absl::stacktrace + absl::leak_check + PUBLIC ) diff --git a/absl/debugging/internal/demangle.cc b/absl/debugging/internal/demangle.cc index 48354459bc85..3ee3df514383 100644 --- a/absl/debugging/internal/demangle.cc +++ b/absl/debugging/internal/demangle.cc @@ -1636,6 +1636,15 @@ static bool ParseExpression(State *state) { } state->parse_state = copy; + // Pointer-to-member access expressions. This parses the same as a binary + // operator, but it's implemented separately because "ds" shouldn't be + // accepted in other contexts that parse an operator name. + if (ParseTwoCharToken(state, "ds") && ParseExpression(state) && + ParseExpression(state)) { + return true; + } + state->parse_state = copy; + // Parameter pack expansion if (ParseTwoCharToken(state, "sp") && ParseExpression(state)) { return true; diff --git a/absl/hash/CMakeLists.txt b/absl/hash/CMakeLists.txt index a0d59b0bd4d3..8f97d7cc1630 100644 --- a/absl/hash/CMakeLists.txt +++ b/absl/hash/CMakeLists.txt @@ -14,40 +14,30 @@ # limitations under the License. # -list(APPEND HASH_PUBLIC_HEADERS - "hash.h" -) - -list(APPEND HASH_INTERNAL_HEADERS - "internal/city.h" - "internal/hash.h" -) - -# absl_hash library -list(APPEND HASH_SRC - "internal/city.cc" - "internal/hash.cc" - ${HASH_PUBLIC_HEADERS} - ${HASH_INTERNAL_HEADERS} -) - -set(HASH_PUBLIC_LIBRARIES absl::hash absl::fixed_array absl::strings absl::str_format absl::utility) - -absl_library( - TARGET - absl_hash - SOURCES - ${HASH_SRC} - PUBLIC_LIBRARIES - ${HASH_PUBLIC_LIBRARIES} - EXPORT_NAME +absl_cc_library( + NAME hash + HDRS + "hash.h" + SRCS + "internal/hash.cc" + "internal/hash.h" + COPTS + ${ABSL_DEFAULT_COPTS} + DEPS + absl::core_headers + absl::endian + absl::fixed_array + absl::meta + absl::int128 + absl::strings + absl::optional + absl::variant + absl::utility + absl::city + PUBLIC ) -# -## TESTS -# - absl_cc_library( NAME hash_testing @@ -62,11 +52,29 @@ absl_cc_library( TESTONLY ) +absl_cc_test( + NAME + hash_test + SRCS + "hash_test.cc" + DEPS + absl::hash + absl::hash_testing + absl::core_headers + absl::flat_hash_set + absl::spy_hash_state + absl::meta + absl::int128 + gmock_main +) + absl_cc_library( NAME spy_hash_state HDRS "internal/spy_hash_state.h" + COPTS + ${ABSL_DEFAULT_COPTS} DEPS absl::hash absl::strings @@ -74,32 +82,30 @@ absl_cc_library( TESTONLY ) -# testing support -set(HASH_TEST_HEADERS hash_testing.h internal/spy_hash_state.h) -set(HASH_TEST_PUBLIC_LIBRARIES absl::hash absl::flat_hash_set absl::numeric absl::strings absl::str_format) - -# hash_test -set(HASH_TEST_SRC "hash_test.cc" ${HASH_TEST_HEADERS}) - -absl_test( - TARGET - hash_test - SOURCES - ${HASH_TEST_SRC} - PUBLIC_LIBRARIES - ${HASH_TEST_PUBLIC_LIBRARIES} +absl_cc_library( + NAME + city + HDRS + "internal/city.h" + SRCS + "internal/city.cc" + COPTS + ${ABSL_DEFAULT_COPTS} + DEPS + absl::config + absl::core_headers + absl::endian ) -# hash_test -set(CITY_TEST_SRC "internal/city_test.cc") - -absl_test( - TARGET +absl_cc_test( + NAME city_test - SOURCES - ${CITY_TEST_SRC} - PUBLIC_LIBRARIES - ${HASH_TEST_PUBLIC_LIBRARIES} + SRCS + "internal/city_test.cc" + COPTS + ${ABSL_TEST_COPTS} + DEPS + absl::city + gmock_main ) - diff --git a/absl/memory/CMakeLists.txt b/absl/memory/CMakeLists.txt index 8f9e731fe6a0..4b494dc011a3 100644 --- a/absl/memory/CMakeLists.txt +++ b/absl/memory/CMakeLists.txt @@ -14,55 +14,45 @@ # limitations under the License. # -list(APPEND MEMORY_PUBLIC_HEADERS - "memory.h" -) - - -absl_header_library( - TARGET - absl_memory - EXPORT_NAME +absl_cc_library( + NAME memory + HDRS + "memory.h" + COPTS + ${ABSL_DEFAULT_COPTS} + DEPS + absl::core_headers + absl::meta + PUBLIC ) -# -## TESTS -# - -# test memory_test -list(APPEND MEMORY_TEST_SRC - "memory_test.cc" - ${MEMORY_PUBLIC_HEADERS} -) -set(MEMORY_TEST_PUBLIC_LIBRARIES absl::base absl::memory) - - - -absl_test( - TARGET +absl_cc_test( + NAME memory_test - SOURCES - ${MEMORY_TEST_SRC} - PUBLIC_LIBRARIES - ${MEMORY_TEST_PUBLIC_LIBRARIES} -) - - -# test memory_exception_safety_test -set(MEMORY_EXCEPTION_SAFETY_TEST_SRC "memory_exception_safety_test.cc") -set(MEMORY_EXCEPTION_SAFETY_TEST_PUBLIC_LIBRARIES - absl::memory - absl_internal_exception_safety_testing + SRCS + "memory_test.cc" + COPTS + ${ABSL_TEST_COPTS} + DEPS + absl::memory + absl::base + absl::core_headers + gmock_main ) -absl_test( - TARGET +absl_cc_test( + NAME memory_exception_safety_test - SOURCES - ${MEMORY_EXCEPTION_SAFETY_TEST_SRC} - PUBLIC_LIBRARIES - ${MEMORY_EXCEPTION_SAFETY_TEST_PUBLIC_LIBRARIES} - PRIVATE_COMPILE_FLAGS + SRCS + "memory_exception_safety_test.cc" + COPTS + ${ABSL_TEST_COPTS} ${ABSL_EXCEPTIONS_FLAG} + LINKOPTS + ${ABSL_EXCEPTIONS_FLAG_LINKOPTS} + DEPS + absl::memory + absl::exception_safety_testing + gmock_main ) diff --git a/absl/memory/memory_test.cc b/absl/memory/memory_test.cc index 54f920b54964..21fe32f9350b 100644 --- a/absl/memory/memory_test.cc +++ b/absl/memory/memory_test.cc @@ -69,6 +69,45 @@ TEST(MakeUniqueTest, Basic) { EXPECT_EQ("hi", *p); } +// InitializationVerifier fills in a pattern when allocated so we can +// distinguish between its default and value initialized states (without +// accessing truly uninitialized memory). +struct InitializationVerifier { + static constexpr int kDefaultScalar = 0x43; + static constexpr int kDefaultArray = 0x4B; + + static void* operator new(size_t n) { + void* ret = ::operator new(n); + memset(ret, kDefaultScalar, n); + return ret; + } + + static void* operator new[](size_t n) { + void* ret = ::operator new[](n); + memset(ret, kDefaultArray, n); + return ret; + } + + int a; + int b; +}; + +TEST(Initialization, MakeUnique) { + auto p = absl::make_unique<InitializationVerifier>(); + + EXPECT_EQ(0, p->a); + EXPECT_EQ(0, p->b); +} + +TEST(Initialization, MakeUniqueArray) { + auto p = absl::make_unique<InitializationVerifier[]>(2); + + EXPECT_EQ(0, p[0].a); + EXPECT_EQ(0, p[0].b); + EXPECT_EQ(0, p[1].a); + EXPECT_EQ(0, p[1].b); +} + struct MoveOnly { MoveOnly() = default; explicit MoveOnly(int i1) : ip1{new int{i1}} {} diff --git a/absl/strings/BUILD.bazel b/absl/strings/BUILD.bazel index 6d7c2619a530..3b85f1b4624e 100644 --- a/absl/strings/BUILD.bazel +++ b/absl/strings/BUILD.bazel @@ -413,6 +413,7 @@ cc_test( copts = ABSL_TEST_COPTS, visibility = ["//visibility:private"], deps = [ + ":pow10_helper", ":strings", "//absl/base", "//absl/base:core_headers", @@ -471,6 +472,8 @@ cc_test( srcs = ["charconv_test.cc"], copts = ABSL_TEST_COPTS, deps = [ + ":pow10_helper", + ":str_format", ":strings", "//absl/base", "@com_google_googletest//:gtest_main", @@ -659,3 +662,23 @@ cc_test( "@com_google_googletest//:gtest_main", ], ) + +cc_library( + name = "pow10_helper", + testonly = True, + srcs = ["internal/pow10_helper.cc"], + hdrs = ["internal/pow10_helper.h"], + visibility = ["//visibility:private"], +) + +cc_test( + name = "pow10_helper_test", + srcs = ["internal/pow10_helper_test.cc"], + copts = ABSL_TEST_COPTS, + visibility = ["//visibility:private"], + deps = [ + ":pow10_helper", + ":str_format", + "@com_google_googletest//:gtest_main", + ], +) diff --git a/absl/strings/CMakeLists.txt b/absl/strings/CMakeLists.txt index a6574c17af3b..5b877ad1ad27 100644 --- a/absl/strings/CMakeLists.txt +++ b/absl/strings/CMakeLists.txt @@ -131,6 +131,15 @@ absl_library( absl::strings ) +# pow10_helper +absl_library( + TARGET + pow10_helper + SOURCES + "internal/pow10_helper.cc" + "internal/pow10_helper.h" +) + # ## TESTS # @@ -316,7 +325,7 @@ absl_test( # test numbers_test set(NUMBERS_TEST_SRC "numbers_test.cc") -set(NUMBERS_TEST_PUBLIC_LIBRARIES absl::strings) +set(NUMBERS_TEST_PUBLIC_LIBRARIES absl::strings pow10_helper) absl_test( TARGET @@ -358,7 +367,7 @@ absl_test( # test charconv_test set(CHARCONV_TEST_SRC "charconv_test.cc") -set(CHARCONV_TEST_PUBLIC_LIBRARIES absl::strings) +set(CHARCONV_TEST_PUBLIC_LIBRARIES absl::strings absl::str_format pow10_helper) absl_test( TARGET @@ -460,3 +469,13 @@ absl_test( absl::base ) +# test pow10_helper_test +absl_test( + TARGET + pow10_helper_test + SOURCES + "internal/pow10_helper_test.cc" + PUBLIC_LIBRARIES + pow10_helper + absl::str_format +) diff --git a/absl/strings/charconv_test.cc b/absl/strings/charconv_test.cc index 89418fe948ff..d07537eb590c 100644 --- a/absl/strings/charconv_test.cc +++ b/absl/strings/charconv_test.cc @@ -19,7 +19,9 @@ #include "gmock/gmock.h" #include "gtest/gtest.h" +#include "absl/strings/internal/pow10_helper.h" #include "absl/strings/str_cat.h" +#include "absl/strings/str_format.h" #ifdef _MSC_FULL_VER #define ABSL_COMPILER_DOES_EXACT_ROUNDING 0 @@ -31,6 +33,8 @@ namespace { +using absl::strings_internal::Pow10; + #if ABSL_COMPILER_DOES_EXACT_ROUNDING // Tests that the given string is accepted by absl::from_chars, and that it @@ -678,7 +682,8 @@ void TestOverflowAndUnderflow( auto result = absl::from_chars(input.data(), input.data() + input.size(), actual); EXPECT_EQ(result.ec, std::errc()); - EXPECT_EQ(expected, actual); + EXPECT_EQ(expected, actual) + << absl::StrFormat("%a vs %a", expected, actual); } // test legal values near upper_bound for (index = upper_bound, step = 1; index > lower_bound; @@ -690,7 +695,8 @@ void TestOverflowAndUnderflow( auto result = absl::from_chars(input.data(), input.data() + input.size(), actual); EXPECT_EQ(result.ec, std::errc()); - EXPECT_EQ(expected, actual); + EXPECT_EQ(expected, actual) + << absl::StrFormat("%a vs %a", expected, actual); } // Test underflow values below lower_bound for (index = lower_bound - 1, step = 1; index > -1000000; @@ -747,7 +753,7 @@ TEST(FromChars, HexdecimalFloatLimits) { // acceptable exponents in this test. TEST(FromChars, DecimalDoubleLimits) { auto input_gen = [](int index) { return absl::StrCat("1.0e", index); }; - auto expected_gen = [](int index) { return std::pow(10.0, index); }; + auto expected_gen = [](int index) { return Pow10(index); }; TestOverflowAndUnderflow<double>(input_gen, expected_gen, -323, 308); } @@ -759,7 +765,7 @@ TEST(FromChars, DecimalDoubleLimits) { // acceptable exponents in this test. TEST(FromChars, DecimalFloatLimits) { auto input_gen = [](int index) { return absl::StrCat("1.0e", index); }; - auto expected_gen = [](int index) { return std::pow(10.0, index); }; + auto expected_gen = [](int index) { return Pow10(index); }; TestOverflowAndUnderflow<float>(input_gen, expected_gen, -45, 38); } diff --git a/absl/strings/internal/pow10_helper.cc b/absl/strings/internal/pow10_helper.cc new file mode 100644 index 000000000000..66be163f43fe --- /dev/null +++ b/absl/strings/internal/pow10_helper.cc @@ -0,0 +1,120 @@ +// Copyright 2018 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 +// +// http://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. + +#include "absl/strings/internal/pow10_helper.h" + +#include <cmath> + +namespace absl { +namespace strings_internal { + +namespace { + +// The exact value of 1e23 falls precisely halfway between two representable +// doubles. Furthermore, the rounding rules we prefer (break ties by rounding +// to the nearest even) dictate in this case that the number should be rounded +// down, but this is not completely specified for floating-point literals in +// C++. (It just says to use the default rounding mode of the standard +// library.) We ensure the result we want by using a number that has an +// unambiguous correctly rounded answer. +constexpr double k1e23 = 9999999999999999e7; + +constexpr double kPowersOfTen[] = { + 0.0, 1e-323, 1e-322, 1e-321, 1e-320, 1e-319, 1e-318, 1e-317, 1e-316, + 1e-315, 1e-314, 1e-313, 1e-312, 1e-311, 1e-310, 1e-309, 1e-308, 1e-307, + 1e-306, 1e-305, 1e-304, 1e-303, 1e-302, 1e-301, 1e-300, 1e-299, 1e-298, + 1e-297, 1e-296, 1e-295, 1e-294, 1e-293, 1e-292, 1e-291, 1e-290, 1e-289, + 1e-288, 1e-287, 1e-286, 1e-285, 1e-284, 1e-283, 1e-282, 1e-281, 1e-280, + 1e-279, 1e-278, 1e-277, 1e-276, 1e-275, 1e-274, 1e-273, 1e-272, 1e-271, + 1e-270, 1e-269, 1e-268, 1e-267, 1e-266, 1e-265, 1e-264, 1e-263, 1e-262, + 1e-261, 1e-260, 1e-259, 1e-258, 1e-257, 1e-256, 1e-255, 1e-254, 1e-253, + 1e-252, 1e-251, 1e-250, 1e-249, 1e-248, 1e-247, 1e-246, 1e-245, 1e-244, + 1e-243, 1e-242, 1e-241, 1e-240, 1e-239, 1e-238, 1e-237, 1e-236, 1e-235, + 1e-234, 1e-233, 1e-232, 1e-231, 1e-230, 1e-229, 1e-228, 1e-227, 1e-226, + 1e-225, 1e-224, 1e-223, 1e-222, 1e-221, 1e-220, 1e-219, 1e-218, 1e-217, + 1e-216, 1e-215, 1e-214, 1e-213, 1e-212, 1e-211, 1e-210, 1e-209, 1e-208, + 1e-207, 1e-206, 1e-205, 1e-204, 1e-203, 1e-202, 1e-201, 1e-200, 1e-199, + 1e-198, 1e-197, 1e-196, 1e-195, 1e-194, 1e-193, 1e-192, 1e-191, 1e-190, + 1e-189, 1e-188, 1e-187, 1e-186, 1e-185, 1e-184, 1e-183, 1e-182, 1e-181, + 1e-180, 1e-179, 1e-178, 1e-177, 1e-176, 1e-175, 1e-174, 1e-173, 1e-172, + 1e-171, 1e-170, 1e-169, 1e-168, 1e-167, 1e-166, 1e-165, 1e-164, 1e-163, + 1e-162, 1e-161, 1e-160, 1e-159, 1e-158, 1e-157, 1e-156, 1e-155, 1e-154, + 1e-153, 1e-152, 1e-151, 1e-150, 1e-149, 1e-148, 1e-147, 1e-146, 1e-145, + 1e-144, 1e-143, 1e-142, 1e-141, 1e-140, 1e-139, 1e-138, 1e-137, 1e-136, + 1e-135, 1e-134, 1e-133, 1e-132, 1e-131, 1e-130, 1e-129, 1e-128, 1e-127, + 1e-126, 1e-125, 1e-124, 1e-123, 1e-122, 1e-121, 1e-120, 1e-119, 1e-118, + 1e-117, 1e-116, 1e-115, 1e-114, 1e-113, 1e-112, 1e-111, 1e-110, 1e-109, + 1e-108, 1e-107, 1e-106, 1e-105, 1e-104, 1e-103, 1e-102, 1e-101, 1e-100, + 1e-99, 1e-98, 1e-97, 1e-96, 1e-95, 1e-94, 1e-93, 1e-92, 1e-91, + 1e-90, 1e-89, 1e-88, 1e-87, 1e-86, 1e-85, 1e-84, 1e-83, 1e-82, + 1e-81, 1e-80, 1e-79, 1e-78, 1e-77, 1e-76, 1e-75, 1e-74, 1e-73, + 1e-72, 1e-71, 1e-70, 1e-69, 1e-68, 1e-67, 1e-66, 1e-65, 1e-64, + 1e-63, 1e-62, 1e-61, 1e-60, 1e-59, 1e-58, 1e-57, 1e-56, 1e-55, + 1e-54, 1e-53, 1e-52, 1e-51, 1e-50, 1e-49, 1e-48, 1e-47, 1e-46, + 1e-45, 1e-44, 1e-43, 1e-42, 1e-41, 1e-40, 1e-39, 1e-38, 1e-37, + 1e-36, 1e-35, 1e-34, 1e-33, 1e-32, 1e-31, 1e-30, 1e-29, 1e-28, + 1e-27, 1e-26, 1e-25, 1e-24, 1e-23, 1e-22, 1e-21, 1e-20, 1e-19, + 1e-18, 1e-17, 1e-16, 1e-15, 1e-14, 1e-13, 1e-12, 1e-11, 1e-10, + 1e-9, 1e-8, 1e-7, 1e-6, 1e-5, 1e-4, 1e-3, 1e-2, 1e-1, + 1e+0, 1e+1, 1e+2, 1e+3, 1e+4, 1e+5, 1e+6, 1e+7, 1e+8, + 1e+9, 1e+10, 1e+11, 1e+12, 1e+13, 1e+14, 1e+15, 1e+16, 1e+17, + 1e+18, 1e+19, 1e+20, 1e+21, 1e+22, k1e23, 1e+24, 1e+25, 1e+26, + 1e+27, 1e+28, 1e+29, 1e+30, 1e+31, 1e+32, 1e+33, 1e+34, 1e+35, + 1e+36, 1e+37, 1e+38, 1e+39, 1e+40, 1e+41, 1e+42, 1e+43, 1e+44, + 1e+45, 1e+46, 1e+47, 1e+48, 1e+49, 1e+50, 1e+51, 1e+52, 1e+53, + 1e+54, 1e+55, 1e+56, 1e+57, 1e+58, 1e+59, 1e+60, 1e+61, 1e+62, + 1e+63, 1e+64, 1e+65, 1e+66, 1e+67, 1e+68, 1e+69, 1e+70, 1e+71, + 1e+72, 1e+73, 1e+74, 1e+75, 1e+76, 1e+77, 1e+78, 1e+79, 1e+80, + 1e+81, 1e+82, 1e+83, 1e+84, 1e+85, 1e+86, 1e+87, 1e+88, 1e+89, + 1e+90, 1e+91, 1e+92, 1e+93, 1e+94, 1e+95, 1e+96, 1e+97, 1e+98, + 1e+99, 1e+100, 1e+101, 1e+102, 1e+103, 1e+104, 1e+105, 1e+106, 1e+107, + 1e+108, 1e+109, 1e+110, 1e+111, 1e+112, 1e+113, 1e+114, 1e+115, 1e+116, + 1e+117, 1e+118, 1e+119, 1e+120, 1e+121, 1e+122, 1e+123, 1e+124, 1e+125, + 1e+126, 1e+127, 1e+128, 1e+129, 1e+130, 1e+131, 1e+132, 1e+133, 1e+134, + 1e+135, 1e+136, 1e+137, 1e+138, 1e+139, 1e+140, 1e+141, 1e+142, 1e+143, + 1e+144, 1e+145, 1e+146, 1e+147, 1e+148, 1e+149, 1e+150, 1e+151, 1e+152, + 1e+153, 1e+154, 1e+155, 1e+156, 1e+157, 1e+158, 1e+159, 1e+160, 1e+161, + 1e+162, 1e+163, 1e+164, 1e+165, 1e+166, 1e+167, 1e+168, 1e+169, 1e+170, + 1e+171, 1e+172, 1e+173, 1e+174, 1e+175, 1e+176, 1e+177, 1e+178, 1e+179, + 1e+180, 1e+181, 1e+182, 1e+183, 1e+184, 1e+185, 1e+186, 1e+187, 1e+188, + 1e+189, 1e+190, 1e+191, 1e+192, 1e+193, 1e+194, 1e+195, 1e+196, 1e+197, + 1e+198, 1e+199, 1e+200, 1e+201, 1e+202, 1e+203, 1e+204, 1e+205, 1e+206, + 1e+207, 1e+208, 1e+209, 1e+210, 1e+211, 1e+212, 1e+213, 1e+214, 1e+215, + 1e+216, 1e+217, 1e+218, 1e+219, 1e+220, 1e+221, 1e+222, 1e+223, 1e+224, + 1e+225, 1e+226, 1e+227, 1e+228, 1e+229, 1e+230, 1e+231, 1e+232, 1e+233, + 1e+234, 1e+235, 1e+236, 1e+237, 1e+238, 1e+239, 1e+240, 1e+241, 1e+242, + 1e+243, 1e+244, 1e+245, 1e+246, 1e+247, 1e+248, 1e+249, 1e+250, 1e+251, + 1e+252, 1e+253, 1e+254, 1e+255, 1e+256, 1e+257, 1e+258, 1e+259, 1e+260, + 1e+261, 1e+262, 1e+263, 1e+264, 1e+265, 1e+266, 1e+267, 1e+268, 1e+269, + 1e+270, 1e+271, 1e+272, 1e+273, 1e+274, 1e+275, 1e+276, 1e+277, 1e+278, + 1e+279, 1e+280, 1e+281, 1e+282, 1e+283, 1e+284, 1e+285, 1e+286, 1e+287, + 1e+288, 1e+289, 1e+290, 1e+291, 1e+292, 1e+293, 1e+294, 1e+295, 1e+296, + 1e+297, 1e+298, 1e+299, 1e+300, 1e+301, 1e+302, 1e+303, 1e+304, 1e+305, + 1e+306, 1e+307, 1e+308, +}; + +} // namespace + +double Pow10(int exp) { + if (exp < -324) { + return 0.0; + } else if (exp > 308) { + return INFINITY; + } else { + return kPowersOfTen[exp + 324]; + } +} + +} // namespace strings_internal +} // namespace absl diff --git a/absl/strings/internal/pow10_helper.h b/absl/strings/internal/pow10_helper.h new file mode 100644 index 000000000000..39c153928de2 --- /dev/null +++ b/absl/strings/internal/pow10_helper.h @@ -0,0 +1,36 @@ +// +// Copyright 2018 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 +// +// http://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. +// +// This test helper library contains a table of powers of 10, to guarantee +// precise values are computed across the full range of doubles. We can't rely +// on the pow() function, because not all standard libraries ship a version +// that is precise. +#ifndef ABSL_STRINGS_POW10_HELPER_H_ +#define ABSL_STRINGS_POW10_HELPER_H_ + +#include <vector> + +namespace absl { +namespace strings_internal { + +// Computes the precise value of 10^exp. (I.e. the nearest representable +// double to the exact value, rounding to nearest-even in the (single) case of +// being exactly halfway between.) +double Pow10(int exp); + +} // namespace strings_internal +} // namespace absl + +#endif // ABSL_STRINGS_POW10_HELPER_H_ diff --git a/absl/strings/internal/pow10_helper_test.cc b/absl/strings/internal/pow10_helper_test.cc new file mode 100644 index 000000000000..9a13d5240da7 --- /dev/null +++ b/absl/strings/internal/pow10_helper_test.cc @@ -0,0 +1,120 @@ +// Copyright 2018 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 +// +// http://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. + +#include "absl/strings/internal/pow10_helper.h" + +#include <cmath> + +#include "gtest/gtest.h" +#include "absl/strings/str_format.h" + +namespace absl { +namespace strings_internal { + +namespace { + +struct TestCase { + int power; // Testing Pow10(power) + uint64_t significand; // Raw bits of the expected value + int radix; // significand is adjusted by 2^radix +}; + +TEST(Pow10HelperTest, Works) { + // The logic in pow10_helper.cc is so simple that theoretically we don't even + // need a test. However, we're paranoid and believe that there may be + // compilers that don't round floating-point literals correctly, even though + // it is specified by the standard. We check various edge cases, just to be + // sure. + constexpr TestCase kTestCases[] = { + // Subnormals + {-323, 0x2, -1074}, + {-322, 0x14, -1074}, + {-321, 0xca, -1074}, + {-320, 0x7e8, -1074}, + {-319, 0x4f10, -1074}, + {-318, 0x316a2, -1074}, + {-317, 0x1ee257, -1074}, + {-316, 0x134d761, -1074}, + {-315, 0xc1069cd, -1074}, + {-314, 0x78a42205, -1074}, + {-313, 0x4b6695433, -1074}, + {-312, 0x2f201d49fb, -1074}, + {-311, 0x1d74124e3d1, -1074}, + {-310, 0x12688b70e62b, -1074}, + {-309, 0xb8157268fdaf, -1074}, + {-308, 0x730d67819e8d2, -1074}, + // Values that are very close to rounding the other way. + // Comment shows difference of significand from the true value. + {-307, 0x11fa182c40c60d, -1072}, // -.4588 + {-290, 0x18f2b061aea072, -1016}, // .4854 + {-276, 0x11BA03F5B21000, -969}, // .4709 + {-259, 0x1899C2F6732210, -913}, // .4830 + {-252, 0x1D53844EE47DD1, -890}, // -.4743 + {-227, 0x1E5297287C2F45, -807}, // -.4708 + {-198, 0x1322E220A5B17E, -710}, // -.4714 + {-195, 0x12B010D3E1CF56, -700}, // .4928 + {-192, 0x123FF06EEA847A, -690}, // .4968 + {-163, 0x1708D0F84D3DE7, -594}, // -.4977 + {-145, 0x13FAAC3E3FA1F3, -534}, // -.4785 + {-111, 0x133D4032C2C7F5, -421}, // .4774 + {-106, 0x1D5B561574765B, -405}, // -.4869 + {-104, 0x16EF5B40C2FC77, -398}, // -.4741 + {-88, 0x197683DF2F268D, -345}, // -.4738 + {-86, 0x13E497065CD61F, -338}, // .4736 + {-76, 0x17288E1271F513, -305}, // -.4761 + {-63, 0x1A53FC9631D10D, -262}, // .4929 + {-30, 0x14484BFEEBC2A0, -152}, // .4758 + {-21, 0x12E3B40A0E9B4F, -122}, // -.4916 + {-5, 0x14F8B588E368F1, -69}, // .4829 + {23, 0x152D02C7E14AF6, 24}, // -.5000 (exactly, round-to-even) + {29, 0x1431E0FAE6D721, 44}, // -.4870 + {34, 0x1ED09BEAD87C03, 60}, // -.4721 + {70, 0x172EBAD6DDC73D, 180}, // .4733 + {105, 0x1BE7ABD3781ECA, 296}, // -.4850 + {126, 0x17A2ECC414A03F, 366}, // -.4999 + {130, 0x1CDA62055B2D9E, 379}, // .4855 + {165, 0x115D847AD00087, 496}, // -.4913 + {172, 0x14B378469B6732, 519}, // .4818 + {187, 0x1262DFEEBBB0F9, 569}, // -.4805 + {210, 0x18557F31326BBB, 645}, // -.4992 + {212, 0x1302CB5E6F642A, 652}, // -.4838 + {215, 0x1290BA9A38C7D1, 662}, // -.4881 + {236, 0x1F736F9B3494E9, 731}, // .4707 + {244, 0x176EC98994F489, 758}, // .4924 + {250, 0x1658E3AB795204, 778}, // -.4963 + {252, 0x117571DDF6C814, 785}, // .4873 + {254, 0x1B4781EAD1989E, 791}, // -.4887 + {260, 0x1A03FDE214CAF1, 811}, // .4784 + {284, 0x1585041B2C477F, 891}, // .4798 + {304, 0x1D2A1BE4048F90, 957}, // -.4987 + // Out-of-range values + {-324, 0x0, 0}, + {-325, 0x0, 0}, + {-326, 0x0, 0}, + {309, 1, 2000}, + {310, 1, 2000}, + {311, 1, 2000}, + }; + for (const TestCase& test_case : kTestCases) { + EXPECT_EQ(Pow10(test_case.power), + std::ldexp(test_case.significand, test_case.radix)) + << absl::StrFormat("Failure for Pow10(%d): %a vs %a", test_case.power, + Pow10(test_case.power), + std::ldexp(test_case.significand, test_case.radix)); + } +} + +} // namespace +} // namespace strings_internal +} // namespace absl diff --git a/absl/strings/numbers_test.cc b/absl/strings/numbers_test.cc index 36fc0d64fd51..099326c270a3 100644 --- a/absl/strings/numbers_test.cc +++ b/absl/strings/numbers_test.cc @@ -39,6 +39,7 @@ #include "absl/strings/str_cat.h" #include "absl/strings/internal/numbers_test_common.h" +#include "absl/strings/internal/pow10_helper.h" namespace { @@ -871,7 +872,7 @@ TEST_F(SimpleDtoaTest, ExhaustiveDoubleToSixDigits) { } for (int exponent = -324; exponent <= 308; ++exponent) { - double powten = pow(10.0, exponent); + double powten = absl::strings_internal::Pow10(exponent); if (powten == 0) powten = 5e-324; if (kFloatNumCases >= 1e9) { // The exhaustive test takes a very long time, so log progress. diff --git a/absl/synchronization/BUILD.bazel b/absl/synchronization/BUILD.bazel index f52e9d41644a..e63b1d168ff9 100644 --- a/absl/synchronization/BUILD.bazel +++ b/absl/synchronization/BUILD.bazel @@ -170,18 +170,32 @@ cc_test( ], ) -cc_test( - name = "mutex_benchmark", +cc_library( + name = "mutex_benchmark_common", + testonly = 1, srcs = ["mutex_benchmark.cc"], - copts = ABSL_TEST_COPTS, - tags = ["benchmark"], - visibility = ["//visibility:private"], + copts = ABSL_DEFAULT_COPTS, + visibility = [ + "//absl/synchronization:__pkg__", + ], deps = [ ":synchronization", ":thread_pool", "//absl/base", + "//absl/base:base_internal", "@com_github_google_benchmark//:benchmark_main", ], + alwayslink = 1, +) + +cc_binary( + name = "mutex_benchmark", + testonly = 1, + copts = ABSL_DEFAULT_COPTS, + visibility = ["//visibility:private"], + deps = [ + ":mutex_benchmark_common", + ], ) cc_test( diff --git a/absl/synchronization/mutex_benchmark.cc b/absl/synchronization/mutex_benchmark.cc index 1e019e001ae4..2652bb974e99 100644 --- a/absl/synchronization/mutex_benchmark.cc +++ b/absl/synchronization/mutex_benchmark.cc @@ -12,16 +12,154 @@ // See the License for the specific language governing permissions and // limitations under the License. +#include <cstdint> +#include <mutex> // NOLINT(build/c++11) #include <vector> -#include "benchmark/benchmark.h" -#include "absl/base/internal/sysinfo.h" +#include "absl/base/internal/cycleclock.h" +#include "absl/base/internal/spinlock.h" #include "absl/synchronization/blocking_counter.h" #include "absl/synchronization/internal/thread_pool.h" #include "absl/synchronization/mutex.h" +#include "benchmark/benchmark.h" namespace { +void BM_Mutex(benchmark::State& state) { + static absl::Mutex* mu = new absl::Mutex; + for (auto _ : state) { + absl::MutexLock lock(mu); + } +} +BENCHMARK(BM_Mutex)->UseRealTime()->Threads(1)->ThreadPerCpu(); + +static void DelayNs(int64_t ns, int* data) { + int64_t end = absl::base_internal::CycleClock::Now() + + ns * absl::base_internal::CycleClock::Frequency() / 1e9; + while (absl::base_internal::CycleClock::Now() < end) { + ++(*data); + benchmark::DoNotOptimize(*data); + } +} + +template <typename MutexType> +class RaiiLocker { + public: + explicit RaiiLocker(MutexType* mu) : mu_(mu) { mu_->Lock(); } + ~RaiiLocker() { mu_->Unlock(); } + private: + MutexType* mu_; +}; + +template <> +class RaiiLocker<std::mutex> { + public: + explicit RaiiLocker(std::mutex* mu) : mu_(mu) { mu_->lock(); } + ~RaiiLocker() { mu_->unlock(); } + private: + std::mutex* mu_; +}; + +template <typename MutexType> +void BM_Contended(benchmark::State& state) { + struct Shared { + MutexType mu; + int data = 0; + }; + static auto* shared = new Shared; + int local = 0; + for (auto _ : state) { + // Here we model both local work outside of the critical section as well as + // some work inside of the critical section. The idea is to capture some + // more or less realisitic contention levels. + // If contention is too low, the benchmark won't measure anything useful. + // If contention is unrealistically high, the benchmark will favor + // bad mutex implementations that block and otherwise distract threads + // from the mutex and shared state for as much as possible. + // To achieve this amount of local work is multiplied by number of threads + // to keep ratio between local work and critical section approximately + // equal regardless of number of threads. + DelayNs(100 * state.threads, &local); + RaiiLocker<MutexType> locker(&shared->mu); + DelayNs(state.range(0), &shared->data); + } +} + +BENCHMARK_TEMPLATE(BM_Contended, absl::Mutex) + ->UseRealTime() + // ThreadPerCpu poorly handles non-power-of-two CPU counts. + ->Threads(1) + ->Threads(2) + ->Threads(4) + ->Threads(6) + ->Threads(8) + ->Threads(12) + ->Threads(16) + ->Threads(24) + ->Threads(32) + ->Threads(48) + ->Threads(64) + ->Threads(96) + ->Threads(128) + ->Threads(192) + ->Threads(256) + // Some empirically chosen amounts of work in critical section. + // 1 is low contention, 200 is high contention and few values in between. + ->Arg(1) + ->Arg(20) + ->Arg(50) + ->Arg(200); + +BENCHMARK_TEMPLATE(BM_Contended, absl::base_internal::SpinLock) + ->UseRealTime() + // ThreadPerCpu poorly handles non-power-of-two CPU counts. + ->Threads(1) + ->Threads(2) + ->Threads(4) + ->Threads(6) + ->Threads(8) + ->Threads(12) + ->Threads(16) + ->Threads(24) + ->Threads(32) + ->Threads(48) + ->Threads(64) + ->Threads(96) + ->Threads(128) + ->Threads(192) + ->Threads(256) + // Some empirically chosen amounts of work in critical section. + // 1 is low contention, 200 is high contention and few values in between. + ->Arg(1) + ->Arg(20) + ->Arg(50) + ->Arg(200); + +BENCHMARK_TEMPLATE(BM_Contended, std::mutex) + ->UseRealTime() + // ThreadPerCpu poorly handles non-power-of-two CPU counts. + ->Threads(1) + ->Threads(2) + ->Threads(4) + ->Threads(6) + ->Threads(8) + ->Threads(12) + ->Threads(16) + ->Threads(24) + ->Threads(32) + ->Threads(48) + ->Threads(64) + ->Threads(96) + ->Threads(128) + ->Threads(192) + ->Threads(256) + // Some empirically chosen amounts of work in critical section. + // 1 is low contention, 200 is high contention and few values in between. + ->Arg(1) + ->Arg(20) + ->Arg(50) + ->Arg(200); + // Measure the overhead of conditions on mutex release (when they must be // evaluated). Mutex has (some) support for equivalence classes allowing // Conditions with the same function/argument to potentially not be multiply @@ -82,13 +220,4 @@ constexpr int kMaxConditionWaiters = 1024; #endif BENCHMARK(BM_ConditionWaiters)->RangePair(0, 2, 1, kMaxConditionWaiters); -void BM_ContendedMutex(benchmark::State& state) { - static absl::Mutex* mu = new absl::Mutex; - for (auto _ : state) { - absl::MutexLock lock(mu); - } -} -BENCHMARK(BM_ContendedMutex)->Threads(1); -BENCHMARK(BM_ContendedMutex)->ThreadPerCpu(); - } // namespace diff --git a/absl/synchronization/notification.h b/absl/synchronization/notification.h index 107932f2909e..f95f4d142a00 100644 --- a/absl/synchronization/notification.h +++ b/absl/synchronization/notification.h @@ -52,6 +52,7 @@ #include <atomic> +#include "absl/base/macros.h" #include "absl/synchronization/mutex.h" #include "absl/time/time.h" diff --git a/absl/time/duration.cc b/absl/time/duration.cc index 2950c7cdc632..b77d5ec9006d 100644 --- a/absl/time/duration.cc +++ b/absl/time/duration.cc @@ -78,10 +78,16 @@ constexpr int64_t kint64min = std::numeric_limits<int64_t>::min(); // Can't use std::isinfinite() because it doesn't exist on windows. inline bool IsFinite(double d) { + if (std::isnan(d)) return false; return d != std::numeric_limits<double>::infinity() && d != -std::numeric_limits<double>::infinity(); } +inline bool IsValidDivisor(double d) { + if (std::isnan(d)) return false; + return d != 0.0; +} + // Can't use std::round() because it is only available in C++11. // Note that we ignore the possibility of floating-point over/underflow. template <typename Double> @@ -455,7 +461,7 @@ Duration& Duration::operator/=(int64_t r) { } Duration& Duration::operator/=(double r) { - if (time_internal::IsInfiniteDuration(*this) || r == 0.0) { + if (time_internal::IsInfiniteDuration(*this) || !IsValidDivisor(r)) { const bool is_neg = (std::signbit(r) != 0) != (rep_hi_ < 0); return *this = is_neg ? -InfiniteDuration() : InfiniteDuration(); } diff --git a/absl/time/duration_test.cc b/absl/time/duration_test.cc index 775da91e6929..61f3c5c07fa1 100644 --- a/absl/time/duration_test.cc +++ b/absl/time/duration_test.cc @@ -803,6 +803,40 @@ TEST(Duration, DivisionByZero) { EXPECT_EQ(-dbl_inf, absl::FDivDuration(-any_dur, zero)); } +TEST(Duration, NaN) { + // Note that IEEE 754 does not define the behavior of a nan's sign when it is + // copied, so the code below allows for either + or - InfiniteDuration. +#define TEST_NAN_HANDLING(NAME, NAN) \ + do { \ + const auto inf = absl::InfiniteDuration(); \ + auto x = NAME(NAN); \ + EXPECT_TRUE(x == inf || x == -inf); \ + auto y = NAME(42); \ + y *= NAN; \ + EXPECT_TRUE(y == inf || y == -inf); \ + auto z = NAME(42); \ + z /= NAN; \ + EXPECT_TRUE(z == inf || z == -inf); \ + } while (0) + + const double nan = std::numeric_limits<double>::quiet_NaN(); + TEST_NAN_HANDLING(absl::Nanoseconds, nan); + TEST_NAN_HANDLING(absl::Microseconds, nan); + TEST_NAN_HANDLING(absl::Milliseconds, nan); + TEST_NAN_HANDLING(absl::Seconds, nan); + TEST_NAN_HANDLING(absl::Minutes, nan); + TEST_NAN_HANDLING(absl::Hours, nan); + + TEST_NAN_HANDLING(absl::Nanoseconds, -nan); + TEST_NAN_HANDLING(absl::Microseconds, -nan); + TEST_NAN_HANDLING(absl::Milliseconds, -nan); + TEST_NAN_HANDLING(absl::Seconds, -nan); + TEST_NAN_HANDLING(absl::Minutes, -nan); + TEST_NAN_HANDLING(absl::Hours, -nan); + +#undef TEST_NAN_HANDLING +} + TEST(Duration, Range) { const absl::Duration range = ApproxYears(100 * 1e9); const absl::Duration range_future = range; diff --git a/absl/time/time.h b/absl/time/time.h index 3fa9378fc849..b86abf27b045 100644 --- a/absl/time/time.h +++ b/absl/time/time.h @@ -69,6 +69,7 @@ #include <winsock2.h> #endif #include <chrono> // NOLINT(build/c++11) +#include <cmath> #include <cstdint> #include <ctime> #include <ostream> @@ -411,10 +412,12 @@ Duration Milliseconds(T n) { } template <typename T, time_internal::EnableIfFloat<T> = 0> Duration Seconds(T n) { - if (n >= 0) { + if (n >= 0) { // Note: `NaN >= 0` is false. if (n >= (std::numeric_limits<int64_t>::max)()) return InfiniteDuration(); return time_internal::MakePosDoubleDuration(n); } else { + if (std::isnan(n)) + return std::signbit(n) ? -InfiniteDuration() : InfiniteDuration(); if (n <= (std::numeric_limits<int64_t>::min)()) return -InfiniteDuration(); return -time_internal::MakePosDoubleDuration(-n); } diff --git a/absl/types/internal/variant.h b/absl/types/internal/variant.h index eff4fefed409..477e5895ed73 100644 --- a/absl/types/internal/variant.h +++ b/absl/types/internal/variant.h @@ -15,6 +15,7 @@ // Implementation details of absl/types/variant.h, pulled into a // separate file to avoid cluttering the top of the API header with // implementation details. +// #ifndef ABSL_TYPES_variant_internal_H_ #define ABSL_TYPES_variant_internal_H_ @@ -1234,23 +1235,29 @@ using VariantCopyBase = absl::conditional_t< // Base that is dependent on whether or not the move-assign can be trivial. template <class... T> using VariantMoveAssignBase = absl::conditional_t< - absl::disjunction<absl::conjunction<absl::is_move_assignable<Union<T...>>, - std::is_move_constructible<Union<T...>>, - std::is_destructible<Union<T...>>>, - absl::negation<absl::conjunction< - std::is_move_constructible<T>..., - absl::is_move_assignable<T>...>>>::value, + absl::disjunction< + absl::conjunction<absl::is_move_assignable<Union<T...>>, + std::is_move_constructible<Union<T...>>, + std::is_destructible<Union<T...>>>, + absl::negation<absl::conjunction<std::is_move_constructible<T>..., + // Note: We're not qualifying this with + // absl:: because it doesn't compile + // under MSVC. + is_move_assignable<T>...>>>::value, VariantCopyBase<T...>, VariantMoveAssignBaseNontrivial<T...>>; // Base that is dependent on whether or not the copy-assign can be trivial. template <class... T> using VariantCopyAssignBase = absl::conditional_t< - absl::disjunction<absl::conjunction<absl::is_copy_assignable<Union<T...>>, - std::is_copy_constructible<Union<T...>>, - std::is_destructible<Union<T...>>>, - absl::negation<absl::conjunction< - std::is_copy_constructible<T>..., - absl::is_copy_assignable<T>...>>>::value, + absl::disjunction< + absl::conjunction<absl::is_copy_assignable<Union<T...>>, + std::is_copy_constructible<Union<T...>>, + std::is_destructible<Union<T...>>>, + absl::negation<absl::conjunction<std::is_copy_constructible<T>..., + // Note: We're not qualifying this with + // absl:: because it doesn't compile + // under MSVC. + is_copy_assignable<T>...>>>::value, VariantMoveAssignBase<T...>, VariantCopyAssignBaseNontrivial<T...>>; template <class... T> diff --git a/absl/types/variant.h b/absl/types/variant.h index 28aaef4feb6e..48c5d7bf2c2b 100644 --- a/absl/types/variant.h +++ b/absl/types/variant.h @@ -82,7 +82,7 @@ namespace absl { // absl::variant // ----------------------------------------------------------------------------- // -// An 'absl::variant` type is a form of type-safe union. An `absl::variant` -- +// An `absl::variant` type is a form of type-safe union. An `absl::variant` -- // except in exceptional cases -- always holds a value of one of its alternative // types. // @@ -136,7 +136,7 @@ void swap(variant<Ts...>& v, variant<Ts...>& w) noexcept(noexcept(v.swap(w))) { // variant_size // -// Returns the number of alterative types available for a given `absl::variant` +// Returns the number of alternative types available for a given `absl::variant` // type as a compile-time constant expression. As this is a class template, it // is not generally useful for accessing the number of alternative types of // any given `absl::variant` instance. @@ -454,7 +454,7 @@ class variant<T0, Tn...> : private variant_internal::VariantBase<T0, Tn...> { std::is_object<Tn>...>::value, "Attempted to instantiate a variant containing a non-object " "type."); - // Intentionally not qualifing `negation` with `absl::` to work around a bug + // Intentionally not qualifying `negation` with `absl::` to work around a bug // in MSVC 2015 with inline namespace and variadic template. static_assert(absl::conjunction<negation<std::is_array<T0> >, negation<std::is_array<Tn> >...>::value, @@ -562,7 +562,7 @@ class variant<T0, Tn...> : private variant_internal::VariantBase<T0, Tn...> { // Assignment Operators - // Copy assignement operator + // Copy assignment operator variant& operator=(const variant& other) = default; // Move assignment operator |