diff options
Diffstat (limited to 'third_party/abseil-cpp/absl/container')
53 files changed, 5772 insertions, 2622 deletions
diff --git a/third_party/abseil-cpp/absl/container/BUILD.bazel b/third_party/abseil-cpp/absl/container/BUILD.bazel index f221714027..ffaee19cdb 100644 --- a/third_party/abseil-cpp/absl/container/BUILD.bazel +++ b/third_party/abseil-cpp/absl/container/BUILD.bazel @@ -14,7 +14,6 @@ # limitations under the License. # -load("@rules_cc//cc:defs.bzl", "cc_library", "cc_test") load( "//absl:copts/configure_copts.bzl", "ABSL_DEFAULT_COPTS", @@ -24,7 +23,7 @@ load( package(default_visibility = ["//visibility:public"]) -licenses(["notice"]) # Apache 2.0 +licenses(["notice"]) cc_library( name = "compressed_tuple", @@ -60,6 +59,7 @@ cc_library( deps = [ ":compressed_tuple", "//absl/algorithm", + "//absl/base:config", "//absl/base:core_headers", "//absl/base:dynamic_annotations", "//absl/base:throw_delegate", @@ -73,7 +73,9 @@ cc_test( copts = ABSL_TEST_COPTS, linkopts = ABSL_DEFAULT_LINKOPTS, deps = [ + ":counting_allocator", ":fixed_array", + "//absl/base:config", "//absl/base:exception_testing", "//absl/hash:hash_testing", "//absl/memory", @@ -153,6 +155,7 @@ cc_test( ":counting_allocator", ":inlined_vector", ":test_instance_tracker", + "//absl/base:config", "//absl/base:core_headers", "//absl/base:exception_testing", "//absl/base:raw_logging_internal", @@ -255,6 +258,7 @@ cc_test( ":unordered_map_lookup_test", ":unordered_map_members_test", ":unordered_map_modifiers_test", + "//absl/base:raw_logging_internal", "//absl/types:any", "@com_google_googletest//:gtest_main", ], @@ -288,6 +292,7 @@ cc_test( ":unordered_set_lookup_test", ":unordered_set_members_test", ":unordered_set_modifiers_test", + "//absl/base:raw_logging_internal", "//absl/memory", "//absl/strings", "@com_google_googletest//:gtest_main", @@ -363,7 +368,9 @@ cc_library( copts = ABSL_DEFAULT_COPTS, linkopts = ABSL_DEFAULT_LINKOPTS, deps = [ + "//absl/base:config", "//absl/memory", + "//absl/meta:type_traits", "//absl/utility", ], ) @@ -376,6 +383,7 @@ cc_test( tags = NOTEST_TAGS_NONMOBILE, deps = [ ":container_memory", + ":test_instance_tracker", "//absl/strings", "@com_google_googletest//:gtest_main", ], @@ -390,6 +398,7 @@ cc_library( "//absl/base:config", "//absl/hash", "//absl/strings", + "//absl/strings:cord", ], ) @@ -402,7 +411,10 @@ cc_test( deps = [ ":hash_function_defaults", "//absl/hash", + "//absl/random", "//absl/strings", + "//absl/strings:cord", + "//absl/strings:cord_test_helpers", "@com_google_googletest//:gtest_main", ], ) @@ -497,9 +509,10 @@ cc_library( ":have_sse", "//absl/base", "//absl/base:core_headers", - "//absl/base:exponential_biased", "//absl/debugging:stacktrace", "//absl/memory", + "//absl/profiling:exponential_biased", + "//absl/profiling:sample_recorder", "//absl/synchronization", "//absl/utility", ], @@ -513,6 +526,7 @@ cc_test( ":hashtablez_sampler", ":have_sse", "//absl/base:core_headers", + "//absl/profiling:sample_recorder", "//absl/synchronization", "//absl/synchronization:thread_pool", "//absl/time", @@ -585,13 +599,12 @@ cc_library( ":hashtable_debug_hooks", ":hashtablez_sampler", ":have_sse", - ":layout", - "//absl/base:bits", "//absl/base:config", "//absl/base:core_headers", "//absl/base:endian", "//absl/memory", "//absl/meta:type_traits", + "//absl/numeric:bits", "//absl/utility", ], ) @@ -609,6 +622,7 @@ cc_test( ":hashtable_debug", ":raw_hash_set", "//absl/base", + "//absl/base:config", "//absl/base:core_headers", "//absl/base:raw_logging_internal", "//absl/strings", @@ -616,6 +630,45 @@ cc_test( ], ) +cc_binary( + name = "raw_hash_set_benchmark", + testonly = 1, + srcs = ["internal/raw_hash_set_benchmark.cc"], + copts = ABSL_TEST_COPTS, + linkopts = ABSL_DEFAULT_LINKOPTS, + tags = ["benchmark"], + visibility = ["//visibility:private"], + deps = [ + ":hash_function_defaults", + ":raw_hash_set", + "//absl/base:raw_logging_internal", + "//absl/strings:str_format", + "@com_github_google_benchmark//:benchmark_main", + ], +) + +cc_binary( + name = "raw_hash_set_probe_benchmark", + testonly = 1, + srcs = ["internal/raw_hash_set_probe_benchmark.cc"], + copts = ABSL_TEST_COPTS, + linkopts = select({ + "//conditions:default": [], + }) + ABSL_DEFAULT_LINKOPTS, + tags = ["benchmark"], + visibility = ["//visibility:private"], + deps = [ + ":flat_hash_map", + ":hash_function_defaults", + ":hashtable_debug", + ":raw_hash_set", + "//absl/random", + "//absl/random:distributions", + "//absl/strings", + "//absl/strings:str_format", + ], +) + cc_test( name = "raw_hash_set_allocator_test", size = "small", @@ -636,6 +689,7 @@ cc_library( copts = ABSL_DEFAULT_COPTS, linkopts = ABSL_DEFAULT_LINKOPTS, deps = [ + "//absl/base:config", "//absl/base:core_headers", "//absl/meta:type_traits", "//absl/strings", @@ -654,6 +708,7 @@ cc_test( visibility = ["//visibility:private"], deps = [ ":layout", + "//absl/base:config", "//absl/base:core_headers", "//absl/base:raw_logging_internal", "//absl/types:span", @@ -661,6 +716,22 @@ cc_test( ], ) +cc_binary( + name = "layout_benchmark", + testonly = 1, + srcs = ["internal/layout_benchmark.cc"], + copts = ABSL_TEST_COPTS, + linkopts = ABSL_DEFAULT_LINKOPTS, + tags = ["benchmark"], + visibility = ["//visibility:private"], + deps = [ + ":layout", + "//absl/base:core_headers", + "//absl/base:raw_logging_internal", + "@com_github_google_benchmark//:benchmark_main", + ], +) + cc_library( name = "tracked", testonly = 1, @@ -805,6 +876,22 @@ cc_test( ], ) +cc_test( + name = "sample_element_size_test", + srcs = ["sample_element_size_test.cc"], + copts = ABSL_TEST_COPTS, + linkopts = ABSL_DEFAULT_LINKOPTS, + tags = NOTEST_TAGS_NONMOBILE, + visibility = ["//visibility:private"], + deps = [ + ":flat_hash_map", + ":flat_hash_set", + ":node_hash_map", + ":node_hash_set", + "@com_google_googletest//:gtest_main", + ], +) + cc_library( name = "btree", srcs = [ @@ -828,6 +915,7 @@ cc_library( "//absl/memory", "//absl/meta:type_traits", "//absl/strings", + "//absl/strings:cord", "//absl/types:compare", "//absl/utility", ], @@ -844,6 +932,7 @@ cc_library( ":btree", ":flat_hash_set", "//absl/strings", + "//absl/strings:cord", "//absl/time", ], ) @@ -895,6 +984,7 @@ cc_binary( "//absl/flags:flag", "//absl/hash", "//absl/memory", + "//absl/strings:cord", "//absl/strings:str_format", "//absl/time", "@com_github_google_benchmark//:benchmark_main", diff --git a/third_party/abseil-cpp/absl/container/CMakeLists.txt b/third_party/abseil-cpp/absl/container/CMakeLists.txt index e702ba8576..78584d2cef 100644 --- a/third_party/abseil-cpp/absl/container/CMakeLists.txt +++ b/third_party/abseil-cpp/absl/container/CMakeLists.txt @@ -14,15 +14,6 @@ # limitations under the License. # -# This is deprecated and will be removed in the future. It also doesn't do -# anything anyways. Prefer to use the library associated with the API you are -# using. -absl_cc_library( - NAME - container - PUBLIC -) - absl_cc_library( NAME btree @@ -40,6 +31,7 @@ absl_cc_library( absl::compare absl::compressed_tuple absl::container_memory + absl::cord absl::core_headers absl::layout absl::memory @@ -60,6 +52,7 @@ absl_cc_library( ${ABSL_DEFAULT_LINKOPTS} DEPS absl::btree + absl::cord absl::flat_hash_set absl::strings absl::time @@ -87,7 +80,7 @@ absl_cc_test( absl::strings absl::test_instance_tracker absl::type_traits - gmock_main + GTest::gmock_main ) absl_cc_library( @@ -116,7 +109,7 @@ absl_cc_test( absl::optional absl::test_instance_tracker absl::utility - gmock_main + GTest::gmock_main ) absl_cc_library( @@ -129,6 +122,7 @@ absl_cc_library( DEPS absl::compressed_tuple absl::algorithm + absl::config absl::core_headers absl::dynamic_annotations absl::throw_delegate @@ -145,10 +139,12 @@ absl_cc_test( ${ABSL_TEST_COPTS} DEPS absl::fixed_array + absl::counting_allocator + absl::config absl::exception_testing absl::hash_testing absl::memory - gmock_main + GTest::gmock_main ) absl_cc_test( @@ -162,7 +158,7 @@ absl_cc_test( absl::fixed_array absl::config absl::exception_safety_testing - gmock_main + GTest::gmock_main ) absl_cc_library( @@ -219,13 +215,14 @@ absl_cc_test( absl::counting_allocator absl::inlined_vector absl::test_instance_tracker + absl::config absl::core_headers absl::exception_testing absl::hash_testing absl::memory absl::raw_logging_internal absl::strings - gmock_main + GTest::gmock_main ) absl_cc_test( @@ -239,7 +236,7 @@ absl_cc_test( absl::inlined_vector absl::config absl::exception_safety_testing - gmock_main + GTest::gmock_main ) absl_cc_library( @@ -265,7 +262,7 @@ absl_cc_test( ${ABSL_TEST_COPTS} DEPS absl::test_instance_tracker - gmock_main + GTest::gmock_main ) absl_cc_library( @@ -299,7 +296,8 @@ absl_cc_test( absl::unordered_map_members_test absl::unordered_map_modifiers_test absl::any - gmock_main + absl::raw_logging_internal + GTest::gmock_main ) absl_cc_library( @@ -335,8 +333,9 @@ absl_cc_test( absl::unordered_set_members_test absl::unordered_set_modifiers_test absl::memory + absl::raw_logging_internal absl::strings - gmock_main + GTest::gmock_main ) absl_cc_library( @@ -371,7 +370,7 @@ absl_cc_test( absl::unordered_map_lookup_test absl::unordered_map_members_test absl::unordered_map_modifiers_test - gmock_main + GTest::gmock_main ) absl_cc_library( @@ -405,7 +404,7 @@ absl_cc_test( absl::unordered_set_lookup_test absl::unordered_set_members_test absl::unordered_set_modifiers_test - gmock_main + GTest::gmock_main ) absl_cc_library( @@ -416,7 +415,9 @@ absl_cc_library( COPTS ${ABSL_DEFAULT_COPTS} DEPS + absl::config absl::memory + absl::type_traits absl::utility PUBLIC ) @@ -431,7 +432,8 @@ absl_cc_test( DEPS absl::container_memory absl::strings - gmock_main + absl::test_instance_tracker + GTest::gmock_main ) absl_cc_library( @@ -443,6 +445,7 @@ absl_cc_library( ${ABSL_DEFAULT_COPTS} DEPS absl::config + absl::cord absl::hash absl::strings PUBLIC @@ -456,10 +459,13 @@ absl_cc_test( COPTS ${ABSL_TEST_COPTS} DEPS + absl::cord + absl::cord_test_helpers absl::hash_function_defaults absl::hash + absl::random_random absl::strings - gmock_main + GTest::gmock_main ) absl_cc_library( @@ -501,7 +507,7 @@ absl_cc_test( ${ABSL_TEST_COPTS} DEPS absl::hash_policy_testing - gmock_main + GTest::gmock_main ) absl_cc_library( @@ -525,7 +531,7 @@ absl_cc_test( ${ABSL_TEST_COPTS} DEPS absl::hash_policy_traits - gmock_main + GTest::gmock_main ) absl_cc_library( @@ -542,6 +548,7 @@ absl_cc_library( absl::base absl::exponential_biased absl::have_sse + absl::sample_recorder absl::synchronization ) @@ -555,7 +562,7 @@ absl_cc_test( DEPS absl::hashtablez_sampler absl::have_sse - gmock_main + GTest::gmock_main ) absl_cc_library( @@ -612,7 +619,7 @@ absl_cc_test( DEPS absl::hash_policy_traits absl::node_hash_policy - gmock_main + GTest::gmock_main ) absl_cc_library( @@ -660,7 +667,6 @@ absl_cc_library( absl::hash_policy_traits absl::hashtable_debug_hooks absl::have_sse - absl::layout absl::memory absl::meta absl::optional @@ -683,10 +689,11 @@ absl_cc_test( absl::hashtable_debug absl::raw_hash_set absl::base + absl::config absl::core_headers absl::raw_logging_internal absl::strings - gmock_main + GTest::gmock_main ) absl_cc_test( @@ -700,7 +707,7 @@ absl_cc_test( absl::raw_hash_set absl::tracked absl::core_headers - gmock_main + GTest::gmock_main ) absl_cc_library( @@ -711,6 +718,7 @@ absl_cc_library( COPTS ${ABSL_DEFAULT_COPTS} DEPS + absl::config absl::core_headers absl::meta absl::strings @@ -728,10 +736,11 @@ absl_cc_test( ${ABSL_TEST_COPTS} DEPS absl::layout + absl::config absl::core_headers absl::raw_logging_internal absl::span - gmock_main + GTest::gmock_main ) absl_cc_library( @@ -756,7 +765,7 @@ absl_cc_library( DEPS absl::hash_generator_testing absl::hash_policy_testing - gmock + GTest::gmock TESTONLY ) @@ -770,7 +779,7 @@ absl_cc_library( DEPS absl::hash_generator_testing absl::hash_policy_testing - gmock + GTest::gmock TESTONLY ) @@ -783,7 +792,7 @@ absl_cc_library( ${ABSL_TEST_COPTS} DEPS absl::type_traits - gmock + GTest::gmock TESTONLY ) @@ -797,7 +806,7 @@ absl_cc_library( DEPS absl::hash_generator_testing absl::hash_policy_testing - gmock + GTest::gmock TESTONLY ) @@ -811,7 +820,7 @@ absl_cc_library( DEPS absl::hash_generator_testing absl::hash_policy_testing - gmock + GTest::gmock TESTONLY ) @@ -825,7 +834,7 @@ absl_cc_library( DEPS absl::hash_generator_testing absl::hash_policy_testing - gmock + GTest::gmock TESTONLY ) @@ -838,7 +847,7 @@ absl_cc_library( ${ABSL_TEST_COPTS} DEPS absl::type_traits - gmock + GTest::gmock TESTONLY ) @@ -852,7 +861,7 @@ absl_cc_library( DEPS absl::hash_generator_testing absl::hash_policy_testing - gmock + GTest::gmock TESTONLY ) @@ -868,7 +877,7 @@ absl_cc_test( absl::unordered_set_lookup_test absl::unordered_set_members_test absl::unordered_set_modifiers_test - gmock_main + GTest::gmock_main ) absl_cc_test( @@ -883,5 +892,20 @@ absl_cc_test( absl::unordered_map_lookup_test absl::unordered_map_members_test absl::unordered_map_modifiers_test - gmock_main + GTest::gmock_main +) + +absl_cc_test( + NAME + sample_element_size_test + SRCS + "sample_element_size_test.cc" + COPTS + ${ABSL_TEST_COPTS} + DEPS + absl::flat_hash_map + absl::flat_hash_set + absl::node_hash_map + absl::node_hash_set + GTest::gmock_main ) diff --git a/third_party/abseil-cpp/absl/container/btree_benchmark.cc b/third_party/abseil-cpp/absl/container/btree_benchmark.cc index 4af92f9fd8..65b6790b71 100644 --- a/third_party/abseil-cpp/absl/container/btree_benchmark.cc +++ b/third_party/abseil-cpp/absl/container/btree_benchmark.cc @@ -26,6 +26,7 @@ #include <unordered_set> #include <vector> +#include "benchmark/benchmark.h" #include "absl/base/internal/raw_logging.h" #include "absl/container/btree_map.h" #include "absl/container/btree_set.h" @@ -36,9 +37,9 @@ #include "absl/flags/flag.h" #include "absl/hash/hash.h" #include "absl/memory/memory.h" +#include "absl/strings/cord.h" #include "absl/strings/str_format.h" #include "absl/time/time.h" -#include "benchmark/benchmark.h" namespace absl { ABSL_NAMESPACE_BEGIN @@ -100,36 +101,24 @@ void BM_InsertSorted(benchmark::State& state) { BM_InsertImpl<T>(state, true); } -// container::insert sometimes returns a pair<iterator, bool> and sometimes -// returns an iterator (for multi- containers). -template <typename Iter> -Iter GetIterFromInsert(const std::pair<Iter, bool>& pair) { - return pair.first; -} -template <typename Iter> -Iter GetIterFromInsert(const Iter iter) { - return iter; -} - -// Benchmark insertion of values into a container at the end. +// Benchmark inserting the first few elements in a container. In b-tree, this is +// when the root node grows. template <typename T> -void BM_InsertEnd(benchmark::State& state) { +void BM_InsertSmall(benchmark::State& state) { using V = typename remove_pair_const<typename T::value_type>::type; - typename KeyOfValue<typename T::key_type, V>::type key_of_value; + const int kSize = 8; + std::vector<V> values = GenerateValues<V>(kSize); T container; - const int kSize = 10000; - for (int i = 0; i < kSize; ++i) { - container.insert(Generator<V>(kSize)(i)); - } - V v = Generator<V>(kSize)(kSize - 1); - typename T::key_type k = key_of_value(v); - auto it = container.find(k); - while (state.KeepRunning()) { - // Repeatedly removing then adding v. - container.erase(it); - it = GetIterFromInsert(container.insert(v)); + while (state.KeepRunningBatch(kSize)) { + for (int i = 0; i < kSize; ++i) { + benchmark::DoNotOptimize(container.insert(values[i])); + } + state.PauseTiming(); + // Do not measure the time it takes to clear the container. + container.clear(); + state.ResumeTiming(); } } @@ -438,6 +427,7 @@ using StdString = std::string; STL_ORDERED_TYPES(int32_t); STL_ORDERED_TYPES(int64_t); STL_ORDERED_TYPES(StdString); +STL_ORDERED_TYPES(Cord); STL_ORDERED_TYPES(Time); #define STL_UNORDERED_TYPES(value) \ @@ -458,6 +448,8 @@ STL_ORDERED_TYPES(Time); using stl_unordered_multimap_##value = \ std::unordered_multimap<value, intptr_t, hash> +STL_UNORDERED_TYPES_CUSTOM_HASH(Cord, absl::Hash<absl::Cord>); + STL_UNORDERED_TYPES(int32_t); STL_UNORDERED_TYPES(int64_t); STL_UNORDERED_TYPES(StdString); @@ -478,6 +470,7 @@ STL_UNORDERED_TYPES_CUSTOM_HASH(Time, absl::Hash<absl::Time>); BTREE_TYPES(int32_t); BTREE_TYPES(int64_t); BTREE_TYPES(StdString); +BTREE_TYPES(Cord); BTREE_TYPES(Time); #define MY_BENCHMARK4(type, func) \ @@ -487,7 +480,7 @@ BTREE_TYPES(Time); #define MY_BENCHMARK3(type) \ MY_BENCHMARK4(type, Insert); \ MY_BENCHMARK4(type, InsertSorted); \ - MY_BENCHMARK4(type, InsertEnd); \ + MY_BENCHMARK4(type, InsertSmall); \ MY_BENCHMARK4(type, Lookup); \ MY_BENCHMARK4(type, FullLookup); \ MY_BENCHMARK4(type, Delete); \ @@ -526,6 +519,7 @@ BTREE_TYPES(Time); MY_BENCHMARK(int32_t); MY_BENCHMARK(int64_t); MY_BENCHMARK(StdString); +MY_BENCHMARK(Cord); MY_BENCHMARK(Time); // Define a type whose size and cost of moving are independently customizable. @@ -538,19 +532,19 @@ struct BigType { BigType() : BigType(0) {} explicit BigType(int x) { std::iota(values.begin(), values.end(), x); } - void Copy(const BigType& x) { - for (int i = 0; i < Size && i < Copies; ++i) values[i] = x.values[i]; + void Copy(const BigType& other) { + for (int i = 0; i < Size && i < Copies; ++i) values[i] = other.values[i]; // If Copies > Size, do extra copies. for (int i = Size, idx = 0; i < Copies; ++i) { - int64_t tmp = x.values[idx]; + int64_t tmp = other.values[idx]; benchmark::DoNotOptimize(tmp); idx = idx + 1 == Size ? 0 : idx + 1; } } - BigType(const BigType& x) { Copy(x); } - BigType& operator=(const BigType& x) { - Copy(x); + BigType(const BigType& other) { Copy(other); } + BigType& operator=(const BigType& other) { + Copy(other); return *this; } @@ -641,14 +635,14 @@ struct BigTypePtr { explicit BigTypePtr(int x) { ptr = absl::make_unique<BigType<Size, Size>>(x); } - BigTypePtr(const BigTypePtr& x) { - ptr = absl::make_unique<BigType<Size, Size>>(*x.ptr); + BigTypePtr(const BigTypePtr& other) { + ptr = absl::make_unique<BigType<Size, Size>>(*other.ptr); } - BigTypePtr(BigTypePtr&& x) noexcept = default; - BigTypePtr& operator=(const BigTypePtr& x) { - ptr = absl::make_unique<BigType<Size, Size>>(*x.ptr); + BigTypePtr(BigTypePtr&& other) noexcept = default; + BigTypePtr& operator=(const BigTypePtr& other) { + ptr = absl::make_unique<BigType<Size, Size>>(*other.ptr); } - BigTypePtr& operator=(BigTypePtr&& x) noexcept = default; + BigTypePtr& operator=(BigTypePtr&& other) noexcept = default; bool operator<(const BigTypePtr& other) const { return *ptr < *other.ptr; } bool operator==(const BigTypePtr& other) const { return *ptr == *other.ptr; } diff --git a/third_party/abseil-cpp/absl/container/btree_map.h b/third_party/abseil-cpp/absl/container/btree_map.h index d23f4ee5e6..f0a8d4a6a4 100644 --- a/third_party/abseil-cpp/absl/container/btree_map.h +++ b/third_party/abseil-cpp/absl/container/btree_map.h @@ -185,7 +185,7 @@ class btree_map // template <typename K> size_type erase(const K& key): // // Erases the element with the matching key, if it exists, returning the - // number of elements erased. + // number of elements erased (0 or 1). using Base::erase; // btree_map::insert() @@ -318,13 +318,18 @@ class btree_map // Extracts the element at the indicated position and returns a node handle // owning that extracted data. // - // template <typename K> node_type extract(const K& x): + // template <typename K> node_type extract(const K& k): // // Extracts the element with the key matching the passed key value and // returns a node handle owning that extracted data. If the `btree_map` // does not contain an element with a matching key, this function returns an // empty node handle. // + // NOTE: when compiled in an earlier version of C++ than C++17, + // `node_type::key()` returns a const reference to the key instead of a + // mutable reference. We cannot safely return a mutable reference without + // std::launder (which is not available before C++17). + // // NOTE: In this context, `node_type` refers to the C++17 concept of a // move-only type that owns and provides access to the elements in associative // containers (https://en.cppreference.com/w/cpp/container/node_handle). @@ -361,8 +366,8 @@ class btree_map // Determines whether an element comparing equal to the given `key` exists // within the `btree_map`, returning `true` if so or `false` otherwise. // - // Supports heterogeneous lookup, provided that the map is provided a - // compatible heterogeneous comparator. + // Supports heterogeneous lookup, provided that the map has a compatible + // heterogeneous comparator. using Base::contains; // btree_map::count() @@ -373,15 +378,14 @@ class btree_map // the `btree_map`. Note that this function will return either `1` or `0` // since duplicate elements are not allowed within a `btree_map`. // - // Supports heterogeneous lookup, provided that the map is provided a - // compatible heterogeneous comparator. + // Supports heterogeneous lookup, provided that the map has a compatible + // heterogeneous comparator. using Base::count; // btree_map::equal_range() // - // Returns a closed range [first, last], defined by a `std::pair` of two - // iterators, containing all elements with the passed key in the - // `btree_map`. + // Returns a half-open range [first, last), defined by a `std::pair` of two + // iterators, containing all elements with the passed key in the `btree_map`. using Base::equal_range; // btree_map::find() @@ -391,10 +395,34 @@ class btree_map // // Finds an element with the passed `key` within the `btree_map`. // - // Supports heterogeneous lookup, provided that the map is provided a - // compatible heterogeneous comparator. + // Supports heterogeneous lookup, provided that the map has a compatible + // heterogeneous comparator. using Base::find; + // btree_map::lower_bound() + // + // template <typename K> iterator lower_bound(const K& key): + // template <typename K> const_iterator lower_bound(const K& key) const: + // + // Finds the first element with a key that is not less than `key` within the + // `btree_map`. + // + // Supports heterogeneous lookup, provided that the map has a compatible + // heterogeneous comparator. + using Base::lower_bound; + + // btree_map::upper_bound() + // + // template <typename K> iterator upper_bound(const K& key): + // template <typename K> const_iterator upper_bound(const K& key) const: + // + // Finds the first element with a key that is greater than `key` within the + // `btree_map`. + // + // Supports heterogeneous lookup, provided that the map has a compatible + // heterogeneous comparator. + using Base::upper_bound; + // btree_map::operator[]() // // Returns a reference to the value mapped to the passed key within the @@ -645,13 +673,18 @@ class btree_multimap // Extracts the element at the indicated position and returns a node handle // owning that extracted data. // - // template <typename K> node_type extract(const K& x): + // template <typename K> node_type extract(const K& k): // // Extracts the element with the key matching the passed key value and // returns a node handle owning that extracted data. If the `btree_multimap` // does not contain an element with a matching key, this function returns an // empty node handle. // + // NOTE: when compiled in an earlier version of C++ than C++17, + // `node_type::key()` returns a const reference to the key instead of a + // mutable reference. We cannot safely return a mutable reference without + // std::launder (which is not available before C++17). + // // NOTE: In this context, `node_type` refers to the C++17 concept of a // move-only type that owns and provides access to the elements in associative // containers (https://en.cppreference.com/w/cpp/container/node_handle). @@ -660,9 +693,8 @@ class btree_multimap // btree_multimap::merge() // - // Extracts elements from a given `source` btree_multimap into this - // `btree_multimap`. If the destination `btree_multimap` already contains an - // element with an equivalent key, that element is not extracted. + // Extracts all elements from a given `source` btree_multimap into this + // `btree_multimap`. using Base::merge; // btree_multimap::swap(btree_multimap& other) @@ -682,8 +714,8 @@ class btree_multimap // Determines whether an element comparing equal to the given `key` exists // within the `btree_multimap`, returning `true` if so or `false` otherwise. // - // Supports heterogeneous lookup, provided that the map is provided a - // compatible heterogeneous comparator. + // Supports heterogeneous lookup, provided that the map has a compatible + // heterogeneous comparator. using Base::contains; // btree_multimap::count() @@ -693,13 +725,13 @@ class btree_multimap // Returns the number of elements comparing equal to the given `key` within // the `btree_multimap`. // - // Supports heterogeneous lookup, provided that the map is provided a - // compatible heterogeneous comparator. + // Supports heterogeneous lookup, provided that the map has a compatible + // heterogeneous comparator. using Base::count; // btree_multimap::equal_range() // - // Returns a closed range [first, last], defined by a `std::pair` of two + // Returns a half-open range [first, last), defined by a `std::pair` of two // iterators, containing all elements with the passed key in the // `btree_multimap`. using Base::equal_range; @@ -711,10 +743,34 @@ class btree_multimap // // Finds an element with the passed `key` within the `btree_multimap`. // - // Supports heterogeneous lookup, provided that the map is provided a - // compatible heterogeneous comparator. + // Supports heterogeneous lookup, provided that the map has a compatible + // heterogeneous comparator. using Base::find; + // btree_multimap::lower_bound() + // + // template <typename K> iterator lower_bound(const K& key): + // template <typename K> const_iterator lower_bound(const K& key) const: + // + // Finds the first element with a key that is not less than `key` within the + // `btree_multimap`. + // + // Supports heterogeneous lookup, provided that the map has a compatible + // heterogeneous comparator. + using Base::lower_bound; + + // btree_multimap::upper_bound() + // + // template <typename K> iterator upper_bound(const K& key): + // template <typename K> const_iterator upper_bound(const K& key) const: + // + // Finds the first element with a key that is greater than `key` within the + // `btree_multimap`. + // + // Supports heterogeneous lookup, provided that the map has a compatible + // heterogeneous comparator. + using Base::upper_bound; + // btree_multimap::get_allocator() // // Returns the allocator function associated with this `btree_multimap`. diff --git a/third_party/abseil-cpp/absl/container/btree_set.h b/third_party/abseil-cpp/absl/container/btree_set.h index 127fb940d4..8973900693 100644 --- a/third_party/abseil-cpp/absl/container/btree_set.h +++ b/third_party/abseil-cpp/absl/container/btree_set.h @@ -183,7 +183,7 @@ class btree_set // template <typename K> size_type erase(const K& key): // // Erases the element with the matching key, if it exists, returning the - // number of elements erased. + // number of elements erased (0 or 1). using Base::erase; // btree_set::insert() @@ -263,7 +263,7 @@ class btree_set // Extracts the element at the indicated position and returns a node handle // owning that extracted data. // - // template <typename K> node_type extract(const K& x): + // template <typename K> node_type extract(const K& k): // // Extracts the element with the key matching the passed key value and // returns a node handle owning that extracted data. If the `btree_set` @@ -300,8 +300,8 @@ class btree_set // Determines whether an element comparing equal to the given `key` exists // within the `btree_set`, returning `true` if so or `false` otherwise. // - // Supports heterogeneous lookup, provided that the set is provided a - // compatible heterogeneous comparator. + // Supports heterogeneous lookup, provided that the set has a compatible + // heterogeneous comparator. using Base::contains; // btree_set::count() @@ -312,8 +312,8 @@ class btree_set // the `btree_set`. Note that this function will return either `1` or `0` // since duplicate elements are not allowed within a `btree_set`. // - // Supports heterogeneous lookup, provided that the set is provided a - // compatible heterogeneous comparator. + // Supports heterogeneous lookup, provided that the set has a compatible + // heterogeneous comparator. using Base::count; // btree_set::equal_range() @@ -330,10 +330,32 @@ class btree_set // // Finds an element with the passed `key` within the `btree_set`. // - // Supports heterogeneous lookup, provided that the set is provided a - // compatible heterogeneous comparator. + // Supports heterogeneous lookup, provided that the set has a compatible + // heterogeneous comparator. using Base::find; + // btree_set::lower_bound() + // + // template <typename K> iterator lower_bound(const K& key): + // template <typename K> const_iterator lower_bound(const K& key) const: + // + // Finds the first element that is not less than `key` within the `btree_set`. + // + // Supports heterogeneous lookup, provided that the set has a compatible + // heterogeneous comparator. + using Base::lower_bound; + + // btree_set::upper_bound() + // + // template <typename K> iterator upper_bound(const K& key): + // template <typename K> const_iterator upper_bound(const K& key) const: + // + // Finds the first element that is greater than `key` within the `btree_set`. + // + // Supports heterogeneous lookup, provided that the set has a compatible + // heterogeneous comparator. + using Base::upper_bound; + // btree_set::get_allocator() // // Returns the allocator function associated with this `btree_set`. @@ -567,7 +589,7 @@ class btree_multiset // Extracts the element at the indicated position and returns a node handle // owning that extracted data. // - // template <typename K> node_type extract(const K& x): + // template <typename K> node_type extract(const K& k): // // Extracts the element with the key matching the passed key value and // returns a node handle owning that extracted data. If the `btree_multiset` @@ -582,9 +604,8 @@ class btree_multiset // btree_multiset::merge() // - // Extracts elements from a given `source` btree_multiset into this - // `btree_multiset`. If the destination `btree_multiset` already contains an - // element with an equivalent key, that element is not extracted. + // Extracts all elements from a given `source` btree_multiset into this + // `btree_multiset`. using Base::merge; // btree_multiset::swap(btree_multiset& other) @@ -604,8 +625,8 @@ class btree_multiset // Determines whether an element comparing equal to the given `key` exists // within the `btree_multiset`, returning `true` if so or `false` otherwise. // - // Supports heterogeneous lookup, provided that the set is provided a - // compatible heterogeneous comparator. + // Supports heterogeneous lookup, provided that the set has a compatible + // heterogeneous comparator. using Base::contains; // btree_multiset::count() @@ -615,8 +636,8 @@ class btree_multiset // Returns the number of elements comparing equal to the given `key` within // the `btree_multiset`. // - // Supports heterogeneous lookup, provided that the set is provided a - // compatible heterogeneous comparator. + // Supports heterogeneous lookup, provided that the set has a compatible + // heterogeneous comparator. using Base::count; // btree_multiset::equal_range() @@ -633,10 +654,34 @@ class btree_multiset // // Finds an element with the passed `key` within the `btree_multiset`. // - // Supports heterogeneous lookup, provided that the set is provided a - // compatible heterogeneous comparator. + // Supports heterogeneous lookup, provided that the set has a compatible + // heterogeneous comparator. using Base::find; + // btree_multiset::lower_bound() + // + // template <typename K> iterator lower_bound(const K& key): + // template <typename K> const_iterator lower_bound(const K& key) const: + // + // Finds the first element that is not less than `key` within the + // `btree_multiset`. + // + // Supports heterogeneous lookup, provided that the set has a compatible + // heterogeneous comparator. + using Base::lower_bound; + + // btree_multiset::upper_bound() + // + // template <typename K> iterator upper_bound(const K& key): + // template <typename K> const_iterator upper_bound(const K& key) const: + // + // Finds the first element that is greater than `key` within the + // `btree_multiset`. + // + // Supports heterogeneous lookup, provided that the set has a compatible + // heterogeneous comparator. + using Base::upper_bound; + // btree_multiset::get_allocator() // // Returns the allocator function associated with this `btree_multiset`. diff --git a/third_party/abseil-cpp/absl/container/btree_test.cc b/third_party/abseil-cpp/absl/container/btree_test.cc index 9edf38f9d0..d27cf27105 100644 --- a/third_party/abseil-cpp/absl/container/btree_test.cc +++ b/third_party/abseil-cpp/absl/container/btree_test.cc @@ -15,6 +15,7 @@ #include "absl/container/btree_test.h" #include <cstdint> +#include <limits> #include <map> #include <memory> #include <stdexcept> @@ -52,7 +53,9 @@ using ::absl::test_internal::MovableOnlyInstance; using ::testing::ElementsAre; using ::testing::ElementsAreArray; using ::testing::IsEmpty; +using ::testing::IsNull; using ::testing::Pair; +using ::testing::SizeIs; template <typename T, typename U> void CheckPairEquals(const T &x, const U &y) { @@ -89,8 +92,8 @@ class base_checker { public: base_checker() : const_tree_(tree_) {} - base_checker(const base_checker &x) - : tree_(x.tree_), const_tree_(tree_), checker_(x.checker_) {} + base_checker(const base_checker &other) + : tree_(other.tree_), const_tree_(tree_), checker_(other.checker_) {} template <typename InputIterator> base_checker(InputIterator b, InputIterator e) : tree_(b, e), const_tree_(tree_), checker_(b, e) {} @@ -124,11 +127,11 @@ class base_checker { } return tree_iter; } - void value_check(const value_type &x) { + void value_check(const value_type &v) { typename KeyOfValue<typename TreeType::key_type, typename TreeType::value_type>::type key_of_value; - const key_type &key = key_of_value(x); - CheckPairEquals(*find(key), x); + const key_type &key = key_of_value(v); + CheckPairEquals(*find(key), v); lower_bound(key); upper_bound(key); equal_range(key); @@ -187,9 +190,9 @@ class base_checker { return res; } - base_checker &operator=(const base_checker &x) { - tree_ = x.tree_; - checker_ = x.checker_; + base_checker &operator=(const base_checker &other) { + tree_ = other.tree_; + checker_ = other.checker_; return *this; } @@ -250,9 +253,9 @@ class base_checker { tree_.clear(); checker_.clear(); } - void swap(base_checker &x) { - tree_.swap(x.tree_); - checker_.swap(x.checker_); + void swap(base_checker &other) { + tree_.swap(other.tree_); + checker_.swap(other.checker_); } void verify() const { @@ -323,28 +326,28 @@ class unique_checker : public base_checker<TreeType, CheckerType> { public: unique_checker() : super_type() {} - unique_checker(const unique_checker &x) : super_type(x) {} + unique_checker(const unique_checker &other) : super_type(other) {} template <class InputIterator> unique_checker(InputIterator b, InputIterator e) : super_type(b, e) {} unique_checker &operator=(const unique_checker &) = default; // Insertion routines. - std::pair<iterator, bool> insert(const value_type &x) { + std::pair<iterator, bool> insert(const value_type &v) { int size = this->tree_.size(); std::pair<typename CheckerType::iterator, bool> checker_res = - this->checker_.insert(x); - std::pair<iterator, bool> tree_res = this->tree_.insert(x); + this->checker_.insert(v); + std::pair<iterator, bool> tree_res = this->tree_.insert(v); CheckPairEquals(*tree_res.first, *checker_res.first); EXPECT_EQ(tree_res.second, checker_res.second); EXPECT_EQ(this->tree_.size(), this->checker_.size()); EXPECT_EQ(this->tree_.size(), size + tree_res.second); return tree_res; } - iterator insert(iterator position, const value_type &x) { + iterator insert(iterator position, const value_type &v) { int size = this->tree_.size(); std::pair<typename CheckerType::iterator, bool> checker_res = - this->checker_.insert(x); - iterator tree_res = this->tree_.insert(position, x); + this->checker_.insert(v); + iterator tree_res = this->tree_.insert(position, v); CheckPairEquals(*tree_res, *checker_res.first); EXPECT_EQ(this->tree_.size(), this->checker_.size()); EXPECT_EQ(this->tree_.size(), size + checker_res.second); @@ -371,25 +374,25 @@ class multi_checker : public base_checker<TreeType, CheckerType> { public: multi_checker() : super_type() {} - multi_checker(const multi_checker &x) : super_type(x) {} + multi_checker(const multi_checker &other) : super_type(other) {} template <class InputIterator> multi_checker(InputIterator b, InputIterator e) : super_type(b, e) {} multi_checker &operator=(const multi_checker &) = default; // Insertion routines. - iterator insert(const value_type &x) { + iterator insert(const value_type &v) { int size = this->tree_.size(); - auto checker_res = this->checker_.insert(x); - iterator tree_res = this->tree_.insert(x); + auto checker_res = this->checker_.insert(v); + iterator tree_res = this->tree_.insert(v); CheckPairEquals(*tree_res, *checker_res); EXPECT_EQ(this->tree_.size(), this->checker_.size()); EXPECT_EQ(this->tree_.size(), size + 1); return tree_res; } - iterator insert(iterator position, const value_type &x) { + iterator insert(iterator position, const value_type &v) { int size = this->tree_.size(); - auto checker_res = this->checker_.insert(x); - iterator tree_res = this->tree_.insert(position, x); + auto checker_res = this->checker_.insert(v); + iterator tree_res = this->tree_.insert(position, v); CheckPairEquals(*tree_res, *checker_res); EXPECT_EQ(this->tree_.size(), this->checker_.size()); EXPECT_EQ(this->tree_.size(), size + 1); @@ -592,7 +595,7 @@ void BtreeTest() { using V = typename remove_pair_const<typename T::value_type>::type; const std::vector<V> random_values = GenerateValuesWithSeed<V>( absl::GetFlag(FLAGS_test_values), 4 * absl::GetFlag(FLAGS_test_values), - testing::GTEST_FLAG(random_seed)); + GTEST_FLAG_GET(random_seed)); unique_checker<T, C> container; @@ -616,7 +619,7 @@ void BtreeMultiTest() { using V = typename remove_pair_const<typename T::value_type>::type; const std::vector<V> random_values = GenerateValuesWithSeed<V>( absl::GetFlag(FLAGS_test_values), 4 * absl::GetFlag(FLAGS_test_values), - testing::GTEST_FLAG(random_seed)); + GTEST_FLAG_GET(random_seed)); multi_checker<T, C> container; @@ -812,10 +815,12 @@ void MapTest() { TEST(Btree, set_int32) { SetTest<int32_t>(); } TEST(Btree, set_int64) { SetTest<int64_t>(); } TEST(Btree, set_string) { SetTest<std::string>(); } +TEST(Btree, set_cord) { SetTest<absl::Cord>(); } TEST(Btree, set_pair) { SetTest<std::pair<int, int>>(); } TEST(Btree, map_int32) { MapTest<int32_t>(); } TEST(Btree, map_int64) { MapTest<int64_t>(); } TEST(Btree, map_string) { MapTest<std::string>(); } +TEST(Btree, map_cord) { MapTest<absl::Cord>(); } TEST(Btree, map_pair) { MapTest<std::pair<int, int>>(); } template <typename K, int N = 256> @@ -847,10 +852,12 @@ void MultiMapTest() { TEST(Btree, multiset_int32) { MultiSetTest<int32_t>(); } TEST(Btree, multiset_int64) { MultiSetTest<int64_t>(); } TEST(Btree, multiset_string) { MultiSetTest<std::string>(); } +TEST(Btree, multiset_cord) { MultiSetTest<absl::Cord>(); } TEST(Btree, multiset_pair) { MultiSetTest<std::pair<int, int>>(); } TEST(Btree, multimap_int32) { MultiMapTest<int32_t>(); } TEST(Btree, multimap_int64) { MultiMapTest<int64_t>(); } TEST(Btree, multimap_string) { MultiMapTest<std::string>(); } +TEST(Btree, multimap_cord) { MultiMapTest<absl::Cord>(); } TEST(Btree, multimap_pair) { MultiMapTest<std::pair<int, int>>(); } struct CompareIntToString { @@ -1176,6 +1183,103 @@ TEST(Btree, RangeCtorSanity) { EXPECT_EQ(1, tmap.size()); } +} // namespace + +class BtreeNodePeer { + public: + // Yields the size of a leaf node with a specific number of values. + template <typename ValueType> + constexpr static size_t GetTargetNodeSize(size_t target_values_per_node) { + return btree_node< + set_params<ValueType, std::less<ValueType>, std::allocator<ValueType>, + /*TargetNodeSize=*/256, // This parameter isn't used here. + /*Multi=*/false>>::SizeWithNSlots(target_values_per_node); + } + + // Yields the number of slots in a (non-root) leaf node for this btree. + template <typename Btree> + constexpr static size_t GetNumSlotsPerNode() { + return btree_node<typename Btree::params_type>::kNodeSlots; + } + + template <typename Btree> + constexpr static size_t GetMaxFieldType() { + return std::numeric_limits< + typename btree_node<typename Btree::params_type>::field_type>::max(); + } + + template <typename Btree> + constexpr static bool UsesLinearNodeSearch() { + return btree_node<typename Btree::params_type>::use_linear_search::value; + } +}; + +namespace { + +class BtreeMapTest : public ::testing::Test { + public: + struct Key {}; + struct Cmp { + template <typename T> + bool operator()(T, T) const { + return false; + } + }; + + struct KeyLin { + using absl_btree_prefer_linear_node_search = std::true_type; + }; + struct CmpLin : Cmp { + using absl_btree_prefer_linear_node_search = std::true_type; + }; + + struct KeyBin { + using absl_btree_prefer_linear_node_search = std::false_type; + }; + struct CmpBin : Cmp { + using absl_btree_prefer_linear_node_search = std::false_type; + }; + + template <typename K, typename C> + static bool IsLinear() { + return BtreeNodePeer::UsesLinearNodeSearch<absl::btree_map<K, int, C>>(); + } +}; + +TEST_F(BtreeMapTest, TestLinearSearchPreferredForKeyLinearViaAlias) { + // Test requesting linear search by directly exporting an alias. + EXPECT_FALSE((IsLinear<Key, Cmp>())); + EXPECT_TRUE((IsLinear<KeyLin, Cmp>())); + EXPECT_TRUE((IsLinear<Key, CmpLin>())); + EXPECT_TRUE((IsLinear<KeyLin, CmpLin>())); +} + +TEST_F(BtreeMapTest, LinearChoiceTree) { + // Cmp has precedence, and is forcing binary + EXPECT_FALSE((IsLinear<Key, CmpBin>())); + EXPECT_FALSE((IsLinear<KeyLin, CmpBin>())); + EXPECT_FALSE((IsLinear<KeyBin, CmpBin>())); + EXPECT_FALSE((IsLinear<int, CmpBin>())); + EXPECT_FALSE((IsLinear<std::string, CmpBin>())); + // Cmp has precedence, and is forcing linear + EXPECT_TRUE((IsLinear<Key, CmpLin>())); + EXPECT_TRUE((IsLinear<KeyLin, CmpLin>())); + EXPECT_TRUE((IsLinear<KeyBin, CmpLin>())); + EXPECT_TRUE((IsLinear<int, CmpLin>())); + EXPECT_TRUE((IsLinear<std::string, CmpLin>())); + // Cmp has no preference, Key determines linear vs binary. + EXPECT_FALSE((IsLinear<Key, Cmp>())); + EXPECT_TRUE((IsLinear<KeyLin, Cmp>())); + EXPECT_FALSE((IsLinear<KeyBin, Cmp>())); + // arithmetic key w/ std::less or std::greater: linear + EXPECT_TRUE((IsLinear<int, std::less<int>>())); + EXPECT_TRUE((IsLinear<double, std::greater<double>>())); + // arithmetic key w/ custom compare: binary + EXPECT_FALSE((IsLinear<int, Cmp>())); + // non-arithmetic key: binary + EXPECT_FALSE((IsLinear<std::string, std::less<std::string>>())); +} + TEST(Btree, BtreeMapCanHoldMoveOnlyTypes) { absl::btree_map<std::string, std::unique_ptr<std::string>> m; @@ -1268,6 +1372,8 @@ TEST(Btree, KeyCompareToAdapter) { AssertKeyCompareToAdapted<std::less<absl::string_view>, absl::string_view>(); AssertKeyCompareToAdapted<std::greater<absl::string_view>, absl::string_view>(); + AssertKeyCompareToAdapted<std::less<absl::Cord>, absl::Cord>(); + AssertKeyCompareToAdapted<std::greater<absl::Cord>, absl::Cord>(); AssertKeyCompareToNotAdapted<std::less<int>, int>(); AssertKeyCompareToNotAdapted<std::greater<int>, int>(); } @@ -1319,28 +1425,6 @@ TEST(Btree, RValueInsert) { EXPECT_EQ(tracker.swaps(), 0); } -} // namespace - -class BtreeNodePeer { - public: - // Yields the size of a leaf node with a specific number of values. - template <typename ValueType> - constexpr static size_t GetTargetNodeSize(size_t target_values_per_node) { - return btree_node< - set_params<ValueType, std::less<ValueType>, std::allocator<ValueType>, - /*TargetNodeSize=*/256, // This parameter isn't used here. - /*Multi=*/false>>::SizeWithNValues(target_values_per_node); - } - - // Yields the number of values in a (non-root) leaf node for this set. - template <typename Set> - constexpr static size_t GetNumValuesPerNode() { - return btree_node<typename Set::params_type>::kNodeValues; - } -}; - -namespace { - // A btree set with a specific number of values per node. template <typename Key, int TargetValuesPerNode, typename Cmp = std::less<Key>> class SizedBtreeSet @@ -1374,7 +1458,7 @@ void ExpectOperationCounts(const int expected_moves, TEST(Btree, MovesComparisonsCopiesSwapsTracking) { InstanceTracker tracker; // Note: this is minimum number of values per node. - SizedBtreeSet<MovableOnlyInstance, /*TargetValuesPerNode=*/3> set3; + SizedBtreeSet<MovableOnlyInstance, /*TargetValuesPerNode=*/4> set4; // Note: this is the default number of values per node for a set of int32s // (with 64-bit pointers). SizedBtreeSet<MovableOnlyInstance, /*TargetValuesPerNode=*/61> set61; @@ -1385,28 +1469,28 @@ TEST(Btree, MovesComparisonsCopiesSwapsTracking) { std::vector<int> values = GenerateValuesWithSeed<int>(10000, 1 << 22, /*seed=*/23); - EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<decltype(set3)>(), 3); - EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<decltype(set61)>(), 61); - EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<decltype(set100)>(), 100); + EXPECT_EQ(BtreeNodePeer::GetNumSlotsPerNode<decltype(set4)>(), 4); + EXPECT_EQ(BtreeNodePeer::GetNumSlotsPerNode<decltype(set61)>(), 61); + EXPECT_EQ(BtreeNodePeer::GetNumSlotsPerNode<decltype(set100)>(), 100); if (sizeof(void *) == 8) { - EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<absl::btree_set<int32_t>>(), - BtreeNodePeer::GetNumValuesPerNode<decltype(set61)>()); + EXPECT_EQ(BtreeNodePeer::GetNumSlotsPerNode<absl::btree_set<int32_t>>(), + BtreeNodePeer::GetNumSlotsPerNode<decltype(set61)>()); } // Test key insertion/deletion in random order. - ExpectOperationCounts(45281, 132551, values, &tracker, &set3); + ExpectOperationCounts(56540, 134212, values, &tracker, &set4); ExpectOperationCounts(386718, 129807, values, &tracker, &set61); ExpectOperationCounts(586761, 130310, values, &tracker, &set100); // Test key insertion/deletion in sorted order. std::sort(values.begin(), values.end()); - ExpectOperationCounts(26638, 92134, values, &tracker, &set3); + ExpectOperationCounts(24972, 85563, values, &tracker, &set4); ExpectOperationCounts(20208, 87757, values, &tracker, &set61); ExpectOperationCounts(20124, 96583, values, &tracker, &set100); // Test key insertion/deletion in reverse sorted order. std::reverse(values.begin(), values.end()); - ExpectOperationCounts(49951, 119325, values, &tracker, &set3); + ExpectOperationCounts(54949, 127531, values, &tracker, &set4); ExpectOperationCounts(338813, 118266, values, &tracker, &set61); ExpectOperationCounts(534529, 125279, values, &tracker, &set100); } @@ -1423,9 +1507,9 @@ struct MovableOnlyInstanceThreeWayCompare { TEST(Btree, MovesComparisonsCopiesSwapsTrackingThreeWayCompare) { InstanceTracker tracker; // Note: this is minimum number of values per node. - SizedBtreeSet<MovableOnlyInstance, /*TargetValuesPerNode=*/3, + SizedBtreeSet<MovableOnlyInstance, /*TargetValuesPerNode=*/4, MovableOnlyInstanceThreeWayCompare> - set3; + set4; // Note: this is the default number of values per node for a set of int32s // (with 64-bit pointers). SizedBtreeSet<MovableOnlyInstance, /*TargetValuesPerNode=*/61, @@ -1440,28 +1524,28 @@ TEST(Btree, MovesComparisonsCopiesSwapsTrackingThreeWayCompare) { std::vector<int> values = GenerateValuesWithSeed<int>(10000, 1 << 22, /*seed=*/23); - EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<decltype(set3)>(), 3); - EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<decltype(set61)>(), 61); - EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<decltype(set100)>(), 100); + EXPECT_EQ(BtreeNodePeer::GetNumSlotsPerNode<decltype(set4)>(), 4); + EXPECT_EQ(BtreeNodePeer::GetNumSlotsPerNode<decltype(set61)>(), 61); + EXPECT_EQ(BtreeNodePeer::GetNumSlotsPerNode<decltype(set100)>(), 100); if (sizeof(void *) == 8) { - EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<absl::btree_set<int32_t>>(), - BtreeNodePeer::GetNumValuesPerNode<decltype(set61)>()); + EXPECT_EQ(BtreeNodePeer::GetNumSlotsPerNode<absl::btree_set<int32_t>>(), + BtreeNodePeer::GetNumSlotsPerNode<decltype(set61)>()); } // Test key insertion/deletion in random order. - ExpectOperationCounts(45281, 122560, values, &tracker, &set3); + ExpectOperationCounts(56540, 124221, values, &tracker, &set4); ExpectOperationCounts(386718, 119816, values, &tracker, &set61); ExpectOperationCounts(586761, 120319, values, &tracker, &set100); // Test key insertion/deletion in sorted order. std::sort(values.begin(), values.end()); - ExpectOperationCounts(26638, 92134, values, &tracker, &set3); + ExpectOperationCounts(24972, 85563, values, &tracker, &set4); ExpectOperationCounts(20208, 87757, values, &tracker, &set61); ExpectOperationCounts(20124, 96583, values, &tracker, &set100); // Test key insertion/deletion in reverse sorted order. std::reverse(values.begin(), values.end()); - ExpectOperationCounts(49951, 109326, values, &tracker, &set3); + ExpectOperationCounts(54949, 117532, values, &tracker, &set4); ExpectOperationCounts(338813, 108267, values, &tracker, &set61); ExpectOperationCounts(534529, 115280, values, &tracker, &set100); } @@ -1537,7 +1621,7 @@ TEST(Btree, MapAt) { #ifdef ABSL_HAVE_EXCEPTIONS EXPECT_THROW(map.at(3), std::out_of_range); #else - EXPECT_DEATH(map.at(3), "absl::btree_map::at"); + EXPECT_DEATH_IF_SUPPORTED(map.at(3), "absl::btree_map::at"); #endif } @@ -1624,10 +1708,25 @@ TEST(Btree, StrSplitCompatible) { EXPECT_EQ(split_set, expected_set); } -// We can't use EXPECT_EQ/etc. to compare absl::weak_ordering because they -// convert literal 0 to int and absl::weak_ordering can only be compared with -// literal 0. Defining this function allows for avoiding ClangTidy warnings. -bool Identity(const bool b) { return b; } +TEST(Btree, KeyComp) { + absl::btree_set<int> s; + EXPECT_TRUE(s.key_comp()(1, 2)); + EXPECT_FALSE(s.key_comp()(2, 2)); + EXPECT_FALSE(s.key_comp()(2, 1)); + + absl::btree_map<int, int> m1; + EXPECT_TRUE(m1.key_comp()(1, 2)); + EXPECT_FALSE(m1.key_comp()(2, 2)); + EXPECT_FALSE(m1.key_comp()(2, 1)); + + // Even though we internally adapt the comparator of `m2` to be three-way and + // heterogeneous, the comparator we expose through key_comp() is the original + // unadapted comparator. + absl::btree_map<std::string, int> m2; + EXPECT_TRUE(m2.key_comp()("a", "b")); + EXPECT_FALSE(m2.key_comp()("b", "b")); + EXPECT_FALSE(m2.key_comp()("b", "a")); +} TEST(Btree, ValueComp) { absl::btree_set<int> s; @@ -1640,13 +1739,13 @@ TEST(Btree, ValueComp) { EXPECT_FALSE(m1.value_comp()(std::make_pair(2, 0), std::make_pair(2, 0))); EXPECT_FALSE(m1.value_comp()(std::make_pair(2, 0), std::make_pair(1, 0))); + // Even though we internally adapt the comparator of `m2` to be three-way and + // heterogeneous, the comparator we expose through value_comp() is based on + // the original unadapted comparator. absl::btree_map<std::string, int> m2; - EXPECT_TRUE(Identity( - m2.value_comp()(std::make_pair("a", 0), std::make_pair("b", 0)) < 0)); - EXPECT_TRUE(Identity( - m2.value_comp()(std::make_pair("b", 0), std::make_pair("b", 0)) == 0)); - EXPECT_TRUE(Identity( - m2.value_comp()(std::make_pair("b", 0), std::make_pair("a", 0)) > 0)); + EXPECT_TRUE(m2.value_comp()(std::make_pair("a", 0), std::make_pair("b", 0))); + EXPECT_FALSE(m2.value_comp()(std::make_pair("b", 0), std::make_pair("b", 0))); + EXPECT_FALSE(m2.value_comp()(std::make_pair("b", 0), std::make_pair("a", 0))); } TEST(Btree, DefaultConstruction) { @@ -1954,6 +2053,30 @@ TEST(Btree, ExtractAndInsertNodeHandleMultiMap) { EXPECT_EQ(res, ++other.begin()); } +TEST(Btree, ExtractMultiMapEquivalentKeys) { + // Note: using string keys means a three-way comparator. + absl::btree_multimap<std::string, int> map; + for (int i = 0; i < 100; ++i) { + for (int j = 0; j < 100; ++j) { + map.insert({absl::StrCat(i), j}); + } + } + + for (int i = 0; i < 100; ++i) { + const std::string key = absl::StrCat(i); + auto node_handle = map.extract(key); + EXPECT_EQ(node_handle.key(), key); + EXPECT_EQ(node_handle.mapped(), 0) << i; + } + + for (int i = 0; i < 100; ++i) { + const std::string key = absl::StrCat(i); + auto node_handle = map.extract(key); + EXPECT_EQ(node_handle.key(), key); + EXPECT_EQ(node_handle.mapped(), 1) << i; + } +} + // For multisets, insert with hint also affects correctness because we need to // insert immediately before the hint if possible. struct InsertMultiHintData { @@ -2095,6 +2218,31 @@ TEST(Btree, MergeIntoMultiMapsWithDifferentComparators) { Pair(4, 1), Pair(4, 4), Pair(5, 5))); } +TEST(Btree, MergeIntoSetMovableOnly) { + absl::btree_set<MovableOnlyInstance> src; + src.insert(MovableOnlyInstance(1)); + absl::btree_multiset<MovableOnlyInstance> dst1; + dst1.insert(MovableOnlyInstance(2)); + absl::btree_set<MovableOnlyInstance> dst2; + + // Test merge into multiset. + dst1.merge(src); + + EXPECT_TRUE(src.empty()); + // ElementsAre/ElementsAreArray don't work with move-only types. + ASSERT_THAT(dst1, SizeIs(2)); + EXPECT_EQ(*dst1.begin(), MovableOnlyInstance(1)); + EXPECT_EQ(*std::next(dst1.begin()), MovableOnlyInstance(2)); + + // Test merge into set. + dst2.merge(dst1); + + EXPECT_TRUE(dst1.empty()); + ASSERT_THAT(dst2, SizeIs(2)); + EXPECT_EQ(*dst2.begin(), MovableOnlyInstance(1)); + EXPECT_EQ(*std::next(dst2.begin()), MovableOnlyInstance(2)); +} + struct KeyCompareToWeakOrdering { template <typename T> absl::weak_ordering operator()(const T &a, const T &b) const { @@ -2126,11 +2274,11 @@ TEST(Btree, UserProvidedKeyCompareToComparators) { TEST(Btree, TryEmplaceBasicTest) { absl::btree_map<int, std::string> m; - // Should construct a std::string from the literal. + // Should construct a string from the literal. m.try_emplace(1, "one"); EXPECT_EQ(1, m.size()); - // Try other std::string constructors and const lvalue key. + // Try other string constructors and const lvalue key. const int key(42); m.try_emplace(key, 3, 'a'); m.try_emplace(2, std::string("two")); @@ -2398,6 +2546,408 @@ TEST(Btree, BitfieldArgument) { m[n]; } +TEST(Btree, SetRangeConstructorAndInsertSupportExplicitConversionComparable) { + const absl::string_view names[] = {"n1", "n2"}; + + absl::btree_set<std::string> name_set1{std::begin(names), std::end(names)}; + EXPECT_THAT(name_set1, ElementsAreArray(names)); + + absl::btree_set<std::string> name_set2; + name_set2.insert(std::begin(names), std::end(names)); + EXPECT_THAT(name_set2, ElementsAreArray(names)); +} + +// A type that is explicitly convertible from int and counts constructor calls. +struct ConstructorCounted { + explicit ConstructorCounted(int i) : i(i) { ++constructor_calls; } + bool operator==(int other) const { return i == other; } + + int i; + static int constructor_calls; +}; +int ConstructorCounted::constructor_calls = 0; + +struct ConstructorCountedCompare { + bool operator()(int a, const ConstructorCounted &b) const { return a < b.i; } + bool operator()(const ConstructorCounted &a, int b) const { return a.i < b; } + bool operator()(const ConstructorCounted &a, + const ConstructorCounted &b) const { + return a.i < b.i; + } + using is_transparent = void; +}; + +TEST(Btree, + SetRangeConstructorAndInsertExplicitConvComparableLimitConstruction) { + const int i[] = {0, 1, 1}; + ConstructorCounted::constructor_calls = 0; + + absl::btree_set<ConstructorCounted, ConstructorCountedCompare> set{ + std::begin(i), std::end(i)}; + EXPECT_THAT(set, ElementsAre(0, 1)); + EXPECT_EQ(ConstructorCounted::constructor_calls, 2); + + set.insert(std::begin(i), std::end(i)); + EXPECT_THAT(set, ElementsAre(0, 1)); + EXPECT_EQ(ConstructorCounted::constructor_calls, 2); +} + +TEST(Btree, + SetRangeConstructorAndInsertSupportExplicitConversionNonComparable) { + const int i[] = {0, 1}; + + absl::btree_set<std::vector<void *>> s1{std::begin(i), std::end(i)}; + EXPECT_THAT(s1, ElementsAre(IsEmpty(), ElementsAre(IsNull()))); + + absl::btree_set<std::vector<void *>> s2; + s2.insert(std::begin(i), std::end(i)); + EXPECT_THAT(s2, ElementsAre(IsEmpty(), ElementsAre(IsNull()))); +} + +// libstdc++ included with GCC 4.9 has a bug in the std::pair constructors that +// prevents explicit conversions between pair types. +// We only run this test for the libstdc++ from GCC 7 or newer because we can't +// reliably check the libstdc++ version prior to that release. +#if !defined(__GLIBCXX__) || \ + (defined(_GLIBCXX_RELEASE) && _GLIBCXX_RELEASE >= 7) +TEST(Btree, MapRangeConstructorAndInsertSupportExplicitConversionComparable) { + const std::pair<absl::string_view, int> names[] = {{"n1", 1}, {"n2", 2}}; + + absl::btree_map<std::string, int> name_map1{std::begin(names), + std::end(names)}; + EXPECT_THAT(name_map1, ElementsAre(Pair("n1", 1), Pair("n2", 2))); + + absl::btree_map<std::string, int> name_map2; + name_map2.insert(std::begin(names), std::end(names)); + EXPECT_THAT(name_map2, ElementsAre(Pair("n1", 1), Pair("n2", 2))); +} + +TEST(Btree, + MapRangeConstructorAndInsertExplicitConvComparableLimitConstruction) { + const std::pair<int, int> i[] = {{0, 1}, {1, 2}, {1, 3}}; + ConstructorCounted::constructor_calls = 0; + + absl::btree_map<ConstructorCounted, int, ConstructorCountedCompare> map{ + std::begin(i), std::end(i)}; + EXPECT_THAT(map, ElementsAre(Pair(0, 1), Pair(1, 2))); + EXPECT_EQ(ConstructorCounted::constructor_calls, 2); + + map.insert(std::begin(i), std::end(i)); + EXPECT_THAT(map, ElementsAre(Pair(0, 1), Pair(1, 2))); + EXPECT_EQ(ConstructorCounted::constructor_calls, 2); +} + +TEST(Btree, + MapRangeConstructorAndInsertSupportExplicitConversionNonComparable) { + const std::pair<int, int> i[] = {{0, 1}, {1, 2}}; + + absl::btree_map<std::vector<void *>, int> m1{std::begin(i), std::end(i)}; + EXPECT_THAT(m1, + ElementsAre(Pair(IsEmpty(), 1), Pair(ElementsAre(IsNull()), 2))); + + absl::btree_map<std::vector<void *>, int> m2; + m2.insert(std::begin(i), std::end(i)); + EXPECT_THAT(m2, + ElementsAre(Pair(IsEmpty(), 1), Pair(ElementsAre(IsNull()), 2))); +} + +TEST(Btree, HeterogeneousTryEmplace) { + absl::btree_map<std::string, int> m; + std::string s = "key"; + absl::string_view sv = s; + m.try_emplace(sv, 1); + EXPECT_EQ(m[s], 1); + + m.try_emplace(m.end(), sv, 2); + EXPECT_EQ(m[s], 1); +} + +TEST(Btree, HeterogeneousOperatorMapped) { + absl::btree_map<std::string, int> m; + std::string s = "key"; + absl::string_view sv = s; + m[sv] = 1; + EXPECT_EQ(m[s], 1); + + m[sv] = 2; + EXPECT_EQ(m[s], 2); +} + +TEST(Btree, HeterogeneousInsertOrAssign) { + absl::btree_map<std::string, int> m; + std::string s = "key"; + absl::string_view sv = s; + m.insert_or_assign(sv, 1); + EXPECT_EQ(m[s], 1); + + m.insert_or_assign(m.end(), sv, 2); + EXPECT_EQ(m[s], 2); +} +#endif + +// This test requires std::launder for mutable key access in node handles. +#if defined(__cpp_lib_launder) && __cpp_lib_launder >= 201606 +TEST(Btree, NodeHandleMutableKeyAccess) { + { + absl::btree_map<std::string, std::string> map; + + map["key1"] = "mapped"; + + auto nh = map.extract(map.begin()); + nh.key().resize(3); + map.insert(std::move(nh)); + + EXPECT_THAT(map, ElementsAre(Pair("key", "mapped"))); + } + // Also for multimap. + { + absl::btree_multimap<std::string, std::string> map; + + map.emplace("key1", "mapped"); + + auto nh = map.extract(map.begin()); + nh.key().resize(3); + map.insert(std::move(nh)); + + EXPECT_THAT(map, ElementsAre(Pair("key", "mapped"))); + } +} +#endif + +struct MultiKey { + int i1; + int i2; +}; + +bool operator==(const MultiKey a, const MultiKey b) { + return a.i1 == b.i1 && a.i2 == b.i2; +} + +// A heterogeneous comparator that has different equivalence classes for +// different lookup types. +struct MultiKeyComp { + using is_transparent = void; + bool operator()(const MultiKey a, const MultiKey b) const { + if (a.i1 != b.i1) return a.i1 < b.i1; + return a.i2 < b.i2; + } + bool operator()(const int a, const MultiKey b) const { return a < b.i1; } + bool operator()(const MultiKey a, const int b) const { return a.i1 < b; } +}; + +// A heterogeneous, three-way comparator that has different equivalence classes +// for different lookup types. +struct MultiKeyThreeWayComp { + using is_transparent = void; + absl::weak_ordering operator()(const MultiKey a, const MultiKey b) const { + if (a.i1 < b.i1) return absl::weak_ordering::less; + if (a.i1 > b.i1) return absl::weak_ordering::greater; + if (a.i2 < b.i2) return absl::weak_ordering::less; + if (a.i2 > b.i2) return absl::weak_ordering::greater; + return absl::weak_ordering::equivalent; + } + absl::weak_ordering operator()(const int a, const MultiKey b) const { + if (a < b.i1) return absl::weak_ordering::less; + if (a > b.i1) return absl::weak_ordering::greater; + return absl::weak_ordering::equivalent; + } + absl::weak_ordering operator()(const MultiKey a, const int b) const { + if (a.i1 < b) return absl::weak_ordering::less; + if (a.i1 > b) return absl::weak_ordering::greater; + return absl::weak_ordering::equivalent; + } +}; + +template <typename Compare> +class BtreeMultiKeyTest : public ::testing::Test {}; +using MultiKeyComps = ::testing::Types<MultiKeyComp, MultiKeyThreeWayComp>; +TYPED_TEST_SUITE(BtreeMultiKeyTest, MultiKeyComps); + +TYPED_TEST(BtreeMultiKeyTest, EqualRange) { + absl::btree_set<MultiKey, TypeParam> set; + for (int i = 0; i < 100; ++i) { + for (int j = 0; j < 100; ++j) { + set.insert({i, j}); + } + } + + for (int i = 0; i < 100; ++i) { + auto equal_range = set.equal_range(i); + EXPECT_EQ(equal_range.first->i1, i); + EXPECT_EQ(equal_range.first->i2, 0) << i; + EXPECT_EQ(std::distance(equal_range.first, equal_range.second), 100) << i; + } +} + +TYPED_TEST(BtreeMultiKeyTest, Extract) { + absl::btree_set<MultiKey, TypeParam> set; + for (int i = 0; i < 100; ++i) { + for (int j = 0; j < 100; ++j) { + set.insert({i, j}); + } + } + + for (int i = 0; i < 100; ++i) { + auto node_handle = set.extract(i); + EXPECT_EQ(node_handle.value().i1, i); + EXPECT_EQ(node_handle.value().i2, 0) << i; + } + + for (int i = 0; i < 100; ++i) { + auto node_handle = set.extract(i); + EXPECT_EQ(node_handle.value().i1, i); + EXPECT_EQ(node_handle.value().i2, 1) << i; + } +} + +TYPED_TEST(BtreeMultiKeyTest, Erase) { + absl::btree_set<MultiKey, TypeParam> set = { + {1, 1}, {2, 1}, {2, 2}, {3, 1}}; + EXPECT_EQ(set.erase(2), 2); + EXPECT_THAT(set, ElementsAre(MultiKey{1, 1}, MultiKey{3, 1})); +} + +TYPED_TEST(BtreeMultiKeyTest, Count) { + const absl::btree_set<MultiKey, TypeParam> set = { + {1, 1}, {2, 1}, {2, 2}, {3, 1}}; + EXPECT_EQ(set.count(2), 2); +} + +TEST(Btree, AllocConstructor) { + using Alloc = CountingAllocator<int>; + using Set = absl::btree_set<int, std::less<int>, Alloc>; + int64_t bytes_used = 0; + Alloc alloc(&bytes_used); + Set set(alloc); + + set.insert({1, 2, 3}); + + EXPECT_THAT(set, ElementsAre(1, 2, 3)); + EXPECT_GT(bytes_used, set.size() * sizeof(int)); +} + +TEST(Btree, AllocInitializerListConstructor) { + using Alloc = CountingAllocator<int>; + using Set = absl::btree_set<int, std::less<int>, Alloc>; + int64_t bytes_used = 0; + Alloc alloc(&bytes_used); + Set set({1, 2, 3}, alloc); + + EXPECT_THAT(set, ElementsAre(1, 2, 3)); + EXPECT_GT(bytes_used, set.size() * sizeof(int)); +} + +TEST(Btree, AllocRangeConstructor) { + using Alloc = CountingAllocator<int>; + using Set = absl::btree_set<int, std::less<int>, Alloc>; + int64_t bytes_used = 0; + Alloc alloc(&bytes_used); + std::vector<int> v = {1, 2, 3}; + Set set(v.begin(), v.end(), alloc); + + EXPECT_THAT(set, ElementsAre(1, 2, 3)); + EXPECT_GT(bytes_used, set.size() * sizeof(int)); +} + +TEST(Btree, AllocCopyConstructor) { + using Alloc = CountingAllocator<int>; + using Set = absl::btree_set<int, std::less<int>, Alloc>; + int64_t bytes_used1 = 0; + Alloc alloc1(&bytes_used1); + Set set1(alloc1); + + set1.insert({1, 2, 3}); + + int64_t bytes_used2 = 0; + Alloc alloc2(&bytes_used2); + Set set2(set1, alloc2); + + EXPECT_THAT(set1, ElementsAre(1, 2, 3)); + EXPECT_THAT(set2, ElementsAre(1, 2, 3)); + EXPECT_GT(bytes_used1, set1.size() * sizeof(int)); + EXPECT_EQ(bytes_used1, bytes_used2); +} + +TEST(Btree, AllocMoveConstructor_SameAlloc) { + using Alloc = CountingAllocator<int>; + using Set = absl::btree_set<int, std::less<int>, Alloc>; + int64_t bytes_used = 0; + Alloc alloc(&bytes_used); + Set set1(alloc); + + set1.insert({1, 2, 3}); + + const int64_t original_bytes_used = bytes_used; + EXPECT_GT(original_bytes_used, set1.size() * sizeof(int)); + + Set set2(std::move(set1), alloc); + + EXPECT_THAT(set2, ElementsAre(1, 2, 3)); + EXPECT_EQ(bytes_used, original_bytes_used); +} + +TEST(Btree, AllocMoveConstructor_DifferentAlloc) { + using Alloc = CountingAllocator<int>; + using Set = absl::btree_set<int, std::less<int>, Alloc>; + int64_t bytes_used1 = 0; + Alloc alloc1(&bytes_used1); + Set set1(alloc1); + + set1.insert({1, 2, 3}); + + const int64_t original_bytes_used = bytes_used1; + EXPECT_GT(original_bytes_used, set1.size() * sizeof(int)); + + int64_t bytes_used2 = 0; + Alloc alloc2(&bytes_used2); + Set set2(std::move(set1), alloc2); + + EXPECT_THAT(set2, ElementsAre(1, 2, 3)); + // We didn't free these bytes allocated by `set1` yet. + EXPECT_EQ(bytes_used1, original_bytes_used); + EXPECT_EQ(bytes_used2, original_bytes_used); +} + +bool IntCmp(const int a, const int b) { return a < b; } + +TEST(Btree, SupportsFunctionPtrComparator) { + absl::btree_set<int, decltype(IntCmp) *> set(IntCmp); + set.insert({1, 2, 3}); + EXPECT_THAT(set, ElementsAre(1, 2, 3)); + EXPECT_TRUE(set.key_comp()(1, 2)); + EXPECT_TRUE(set.value_comp()(1, 2)); + + absl::btree_map<int, int, decltype(IntCmp) *> map(&IntCmp); + map[1] = 1; + EXPECT_THAT(map, ElementsAre(Pair(1, 1))); + EXPECT_TRUE(map.key_comp()(1, 2)); + EXPECT_TRUE(map.value_comp()(std::make_pair(1, 1), std::make_pair(2, 2))); +} + +template <typename Compare> +struct TransparentPassThroughComp { + using is_transparent = void; + + // This will fail compilation if we attempt a comparison that Compare does not + // support, and the failure will happen inside the function implementation so + // it can't be avoided by using SFINAE on this comparator. + template <typename T, typename U> + bool operator()(const T &lhs, const U &rhs) const { + return Compare()(lhs, rhs); + } +}; + +TEST(Btree, + SupportsTransparentComparatorThatDoesNotImplementAllVisibleOperators) { + absl::btree_set<MultiKey, TransparentPassThroughComp<MultiKeyComp>> set; + set.insert(MultiKey{1, 2}); + EXPECT_TRUE(set.contains(1)); +} + +TEST(Btree, ConstructImplicitlyWithUnadaptedComparator) { + absl::btree_set<MultiKey, MultiKeyComp> set = {{}, MultiKeyComp{}}; +} + } // namespace } // namespace container_internal ABSL_NAMESPACE_END diff --git a/third_party/abseil-cpp/absl/container/btree_test.h b/third_party/abseil-cpp/absl/container/btree_test.h index 218ba41dc2..624908072d 100644 --- a/third_party/abseil-cpp/absl/container/btree_test.h +++ b/third_party/abseil-cpp/absl/container/btree_test.h @@ -25,6 +25,7 @@ #include "absl/container/btree_map.h" #include "absl/container/btree_set.h" #include "absl/container/flat_hash_set.h" +#include "absl/strings/cord.h" #include "absl/time/time.h" namespace absl { @@ -100,6 +101,16 @@ struct Generator<std::string> { } }; +template <> +struct Generator<Cord> { + int maxval; + explicit Generator(int m) : maxval(m) {} + Cord operator()(int i) const { + char buf[16]; + return Cord(GenerateDigits(buf, i, maxval)); + } +}; + template <typename T, typename U> struct Generator<std::pair<T, U> > { Generator<typename remove_pair_const<T>::type> tgen; diff --git a/third_party/abseil-cpp/absl/container/fixed_array.h b/third_party/abseil-cpp/absl/container/fixed_array.h index a9ce99bafd..839ba0bc16 100644 --- a/third_party/abseil-cpp/absl/container/fixed_array.h +++ b/third_party/abseil-cpp/absl/container/fixed_array.h @@ -41,6 +41,7 @@ #include <type_traits> #include "absl/algorithm/algorithm.h" +#include "absl/base/config.h" #include "absl/base/dynamic_annotations.h" #include "absl/base/internal/throw_delegate.h" #include "absl/base/macros.h" @@ -72,11 +73,6 @@ constexpr static auto kFixedArrayUseDefault = static_cast<size_t>(-1); // uninitialized (e.g. int, int[4], double), and others default-constructed. // This matches the behavior of c-style arrays and `std::array`, but not // `std::vector`. -// -// Note that `FixedArray` does not provide a public allocator; if it requires a -// heap allocation, it will do so with global `::operator new[]()` and -// `::operator delete[]()`, even if T provides class-scope overrides for these -// operators. template <typename T, size_t N = kFixedArrayUseDefault, typename A = std::allocator<T>> class FixedArray { @@ -106,13 +102,13 @@ class FixedArray { public: using allocator_type = typename AllocatorTraits::allocator_type; - using value_type = typename allocator_type::value_type; - using pointer = typename allocator_type::pointer; - using const_pointer = typename allocator_type::const_pointer; - using reference = typename allocator_type::reference; - using const_reference = typename allocator_type::const_reference; - using size_type = typename allocator_type::size_type; - using difference_type = typename allocator_type::difference_type; + using value_type = typename AllocatorTraits::value_type; + using pointer = typename AllocatorTraits::pointer; + using const_pointer = typename AllocatorTraits::const_pointer; + using reference = value_type&; + using const_reference = const value_type&; + using size_type = typename AllocatorTraits::size_type; + using difference_type = typename AllocatorTraits::difference_type; using iterator = pointer; using const_iterator = const_pointer; using reverse_iterator = std::reverse_iterator<iterator>; @@ -217,7 +213,7 @@ class FixedArray { // Returns a reference the ith element of the fixed array. // REQUIRES: 0 <= i < size() reference operator[](size_type i) { - assert(i < size()); + ABSL_HARDENING_ASSERT(i < size()); return data()[i]; } @@ -225,14 +221,14 @@ class FixedArray { // ith element of the fixed array. // REQUIRES: 0 <= i < size() const_reference operator[](size_type i) const { - assert(i < size()); + ABSL_HARDENING_ASSERT(i < size()); return data()[i]; } // FixedArray::at // - // Bounds-checked access. Returns a reference to the ith element of the - // fiexed array, or throws std::out_of_range + // Bounds-checked access. Returns a reference to the ith element of the fixed + // array, or throws std::out_of_range reference at(size_type i) { if (ABSL_PREDICT_FALSE(i >= size())) { base_internal::ThrowStdOutOfRange("FixedArray::at failed bounds check"); @@ -252,20 +248,32 @@ class FixedArray { // FixedArray::front() // // Returns a reference to the first element of the fixed array. - reference front() { return *begin(); } + reference front() { + ABSL_HARDENING_ASSERT(!empty()); + return data()[0]; + } // Overload of FixedArray::front() to return a reference to the first element // of a fixed array of const values. - const_reference front() const { return *begin(); } + const_reference front() const { + ABSL_HARDENING_ASSERT(!empty()); + return data()[0]; + } // FixedArray::back() // // Returns a reference to the last element of the fixed array. - reference back() { return *(end() - 1); } + reference back() { + ABSL_HARDENING_ASSERT(!empty()); + return data()[size() - 1]; + } // Overload of FixedArray::back() to return a reference to the last element // of a fixed array of const values. - const_reference back() const { return *(end() - 1); } + const_reference back() const { + ABSL_HARDENING_ASSERT(!empty()); + return data()[size() - 1]; + } // FixedArray::begin() // @@ -410,15 +418,15 @@ class FixedArray { void AnnotateConstruct(size_type n); void AnnotateDestruct(size_type n); -#ifdef ADDRESS_SANITIZER +#ifdef ABSL_HAVE_ADDRESS_SANITIZER void* RedzoneBegin() { return &redzone_begin_; } void* RedzoneEnd() { return &redzone_end_ + 1; } -#endif // ADDRESS_SANITIZER +#endif // ABSL_HAVE_ADDRESS_SANITIZER private: - ADDRESS_SANITIZER_REDZONE(redzone_begin_); + ABSL_ADDRESS_SANITIZER_REDZONE(redzone_begin_); alignas(StorageElement) char buff_[sizeof(StorageElement[inline_elements])]; - ADDRESS_SANITIZER_REDZONE(redzone_end_); + ABSL_ADDRESS_SANITIZER_REDZONE(redzone_end_); }; class EmptyInlinedStorage { @@ -491,22 +499,26 @@ constexpr typename FixedArray<T, N, A>::size_type template <typename T, size_t N, typename A> void FixedArray<T, N, A>::NonEmptyInlinedStorage::AnnotateConstruct( typename FixedArray<T, N, A>::size_type n) { -#ifdef ADDRESS_SANITIZER +#ifdef ABSL_HAVE_ADDRESS_SANITIZER if (!n) return; - ANNOTATE_CONTIGUOUS_CONTAINER(data(), RedzoneEnd(), RedzoneEnd(), data() + n); - ANNOTATE_CONTIGUOUS_CONTAINER(RedzoneBegin(), data(), data(), RedzoneBegin()); -#endif // ADDRESS_SANITIZER + ABSL_ANNOTATE_CONTIGUOUS_CONTAINER(data(), RedzoneEnd(), RedzoneEnd(), + data() + n); + ABSL_ANNOTATE_CONTIGUOUS_CONTAINER(RedzoneBegin(), data(), data(), + RedzoneBegin()); +#endif // ABSL_HAVE_ADDRESS_SANITIZER static_cast<void>(n); // Mark used when not in asan mode } template <typename T, size_t N, typename A> void FixedArray<T, N, A>::NonEmptyInlinedStorage::AnnotateDestruct( typename FixedArray<T, N, A>::size_type n) { -#ifdef ADDRESS_SANITIZER +#ifdef ABSL_HAVE_ADDRESS_SANITIZER if (!n) return; - ANNOTATE_CONTIGUOUS_CONTAINER(data(), RedzoneEnd(), data() + n, RedzoneEnd()); - ANNOTATE_CONTIGUOUS_CONTAINER(RedzoneBegin(), data(), RedzoneBegin(), data()); -#endif // ADDRESS_SANITIZER + ABSL_ANNOTATE_CONTIGUOUS_CONTAINER(data(), RedzoneEnd(), data() + n, + RedzoneEnd()); + ABSL_ANNOTATE_CONTIGUOUS_CONTAINER(RedzoneBegin(), data(), RedzoneBegin(), + data()); +#endif // ABSL_HAVE_ADDRESS_SANITIZER static_cast<void>(n); // Mark used when not in asan mode } ABSL_NAMESPACE_END diff --git a/third_party/abseil-cpp/absl/container/fixed_array_exception_safety_test.cc b/third_party/abseil-cpp/absl/container/fixed_array_exception_safety_test.cc index a5bb009d98..e5f59299b3 100644 --- a/third_party/abseil-cpp/absl/container/fixed_array_exception_safety_test.cc +++ b/third_party/abseil-cpp/absl/container/fixed_array_exception_safety_test.cc @@ -150,8 +150,7 @@ TEST(FixedArrayExceptionSafety, InitListConstructorWithAlloc) { template <typename FixedArrT> testing::AssertionResult ReadMemory(FixedArrT* fixed_arr) { - // Marked volatile to prevent optimization. Used for running asan tests. - volatile int sum = 0; + int sum = 0; for (const auto& thrower : *fixed_arr) { sum += thrower.Get(); } diff --git a/third_party/abseil-cpp/absl/container/fixed_array_test.cc b/third_party/abseil-cpp/absl/container/fixed_array_test.cc index c960fe51c1..49598e7a05 100644 --- a/third_party/abseil-cpp/absl/container/fixed_array_test.cc +++ b/third_party/abseil-cpp/absl/container/fixed_array_test.cc @@ -27,7 +27,10 @@ #include "gmock/gmock.h" #include "gtest/gtest.h" +#include "absl/base/config.h" #include "absl/base/internal/exception_testing.h" +#include "absl/base/options.h" +#include "absl/container/internal/counting_allocator.h" #include "absl/hash/hash_testing.h" #include "absl/memory/memory.h" @@ -188,6 +191,21 @@ TEST(FixedArrayTest, AtThrows) { "failed bounds check"); } +TEST(FixedArrayTest, Hardened) { +#if !defined(NDEBUG) || ABSL_OPTION_HARDENED + absl::FixedArray<int> a = {1, 2, 3}; + EXPECT_EQ(a[2], 3); + EXPECT_DEATH_IF_SUPPORTED(a[3], ""); + EXPECT_DEATH_IF_SUPPORTED(a[-1], ""); + + absl::FixedArray<int> empty(0); + EXPECT_DEATH_IF_SUPPORTED(empty[0], ""); + EXPECT_DEATH_IF_SUPPORTED(empty[-1], ""); + EXPECT_DEATH_IF_SUPPORTED(empty.front(), ""); + EXPECT_DEATH_IF_SUPPORTED(empty.back(), ""); +#endif +} + TEST(FixedArrayRelationalsTest, EqualArrays) { for (int i = 0; i < 10; ++i) { absl::FixedArray<int, 5> a1(i); @@ -622,70 +640,9 @@ TEST(FixedArrayTest, DefaultCtorDoesNotValueInit) { } #endif // __GNUC__ -// This is a stateful allocator, but the state lives outside of the -// allocator (in whatever test is using the allocator). This is odd -// but helps in tests where the allocator is propagated into nested -// containers - that chain of allocators uses the same state and is -// thus easier to query for aggregate allocation information. -template <typename T> -class CountingAllocator : public std::allocator<T> { - public: - using Alloc = std::allocator<T>; - using pointer = typename Alloc::pointer; - using size_type = typename Alloc::size_type; - - CountingAllocator() : bytes_used_(nullptr), instance_count_(nullptr) {} - explicit CountingAllocator(int64_t* b) - : bytes_used_(b), instance_count_(nullptr) {} - CountingAllocator(int64_t* b, int64_t* a) - : bytes_used_(b), instance_count_(a) {} - - template <typename U> - explicit CountingAllocator(const CountingAllocator<U>& x) - : Alloc(x), - bytes_used_(x.bytes_used_), - instance_count_(x.instance_count_) {} - - pointer allocate(size_type n, const void* const hint = nullptr) { - assert(bytes_used_ != nullptr); - *bytes_used_ += n * sizeof(T); - return Alloc::allocate(n, hint); - } - - void deallocate(pointer p, size_type n) { - Alloc::deallocate(p, n); - assert(bytes_used_ != nullptr); - *bytes_used_ -= n * sizeof(T); - } - - template <typename... Args> - void construct(pointer p, Args&&... args) { - Alloc::construct(p, absl::forward<Args>(args)...); - if (instance_count_) { - *instance_count_ += 1; - } - } - - void destroy(pointer p) { - Alloc::destroy(p); - if (instance_count_) { - *instance_count_ -= 1; - } - } - - template <typename U> - class rebind { - public: - using other = CountingAllocator<U>; - }; - - int64_t* bytes_used_; - int64_t* instance_count_; -}; - TEST(AllocatorSupportTest, CountInlineAllocations) { constexpr size_t inlined_size = 4; - using Alloc = CountingAllocator<int>; + using Alloc = absl::container_internal::CountingAllocator<int>; using AllocFxdArr = absl::FixedArray<int, inlined_size, Alloc>; int64_t allocated = 0; @@ -706,7 +663,7 @@ TEST(AllocatorSupportTest, CountInlineAllocations) { TEST(AllocatorSupportTest, CountOutoflineAllocations) { constexpr size_t inlined_size = 4; - using Alloc = CountingAllocator<int>; + using Alloc = absl::container_internal::CountingAllocator<int>; using AllocFxdArr = absl::FixedArray<int, inlined_size, Alloc>; int64_t allocated = 0; @@ -727,7 +684,7 @@ TEST(AllocatorSupportTest, CountOutoflineAllocations) { TEST(AllocatorSupportTest, CountCopyInlineAllocations) { constexpr size_t inlined_size = 4; - using Alloc = CountingAllocator<int>; + using Alloc = absl::container_internal::CountingAllocator<int>; using AllocFxdArr = absl::FixedArray<int, inlined_size, Alloc>; int64_t allocated1 = 0; @@ -755,7 +712,7 @@ TEST(AllocatorSupportTest, CountCopyInlineAllocations) { TEST(AllocatorSupportTest, CountCopyOutoflineAllocations) { constexpr size_t inlined_size = 4; - using Alloc = CountingAllocator<int>; + using Alloc = absl::container_internal::CountingAllocator<int>; using AllocFxdArr = absl::FixedArray<int, inlined_size, Alloc>; int64_t allocated1 = 0; @@ -787,7 +744,7 @@ TEST(AllocatorSupportTest, SizeValAllocConstructor) { using testing::SizeIs; constexpr size_t inlined_size = 4; - using Alloc = CountingAllocator<int>; + using Alloc = absl::container_internal::CountingAllocator<int>; using AllocFxdArr = absl::FixedArray<int, inlined_size, Alloc>; { @@ -811,16 +768,16 @@ TEST(AllocatorSupportTest, SizeValAllocConstructor) { } } -#ifdef ADDRESS_SANITIZER +#ifdef ABSL_HAVE_ADDRESS_SANITIZER TEST(FixedArrayTest, AddressSanitizerAnnotations1) { absl::FixedArray<int, 32> a(10); int* raw = a.data(); raw[0] = 0; raw[9] = 0; - EXPECT_DEATH(raw[-2] = 0, "container-overflow"); - EXPECT_DEATH(raw[-1] = 0, "container-overflow"); - EXPECT_DEATH(raw[10] = 0, "container-overflow"); - EXPECT_DEATH(raw[31] = 0, "container-overflow"); + EXPECT_DEATH_IF_SUPPORTED(raw[-2] = 0, "container-overflow"); + EXPECT_DEATH_IF_SUPPORTED(raw[-1] = 0, "container-overflow"); + EXPECT_DEATH_IF_SUPPORTED(raw[10] = 0, "container-overflow"); + EXPECT_DEATH_IF_SUPPORTED(raw[31] = 0, "container-overflow"); } TEST(FixedArrayTest, AddressSanitizerAnnotations2) { @@ -828,10 +785,10 @@ TEST(FixedArrayTest, AddressSanitizerAnnotations2) { char* raw = a.data(); raw[0] = 0; raw[11] = 0; - EXPECT_DEATH(raw[-7] = 0, "container-overflow"); - EXPECT_DEATH(raw[-1] = 0, "container-overflow"); - EXPECT_DEATH(raw[12] = 0, "container-overflow"); - EXPECT_DEATH(raw[17] = 0, "container-overflow"); + EXPECT_DEATH_IF_SUPPORTED(raw[-7] = 0, "container-overflow"); + EXPECT_DEATH_IF_SUPPORTED(raw[-1] = 0, "container-overflow"); + EXPECT_DEATH_IF_SUPPORTED(raw[12] = 0, "container-overflow"); + EXPECT_DEATH_IF_SUPPORTED(raw[17] = 0, "container-overflow"); } TEST(FixedArrayTest, AddressSanitizerAnnotations3) { @@ -839,8 +796,8 @@ TEST(FixedArrayTest, AddressSanitizerAnnotations3) { uint64_t* raw = a.data(); raw[0] = 0; raw[19] = 0; - EXPECT_DEATH(raw[-1] = 0, "container-overflow"); - EXPECT_DEATH(raw[20] = 0, "container-overflow"); + EXPECT_DEATH_IF_SUPPORTED(raw[-1] = 0, "container-overflow"); + EXPECT_DEATH_IF_SUPPORTED(raw[20] = 0, "container-overflow"); } TEST(FixedArrayTest, AddressSanitizerAnnotations4) { @@ -852,13 +809,13 @@ TEST(FixedArrayTest, AddressSanitizerAnnotations4) { // there is only a 8-byte red zone before the container range, so we only // access the last 4 bytes of the struct to make sure it stays within the red // zone. - EXPECT_DEATH(raw[-1].z_ = 0, "container-overflow"); - EXPECT_DEATH(raw[10] = ThreeInts(), "container-overflow"); + EXPECT_DEATH_IF_SUPPORTED(raw[-1].z_ = 0, "container-overflow"); + EXPECT_DEATH_IF_SUPPORTED(raw[10] = ThreeInts(), "container-overflow"); // The actual size of storage is kDefaultBytes=256, 21*12 = 252, // so reading raw[21] should still trigger the correct warning. - EXPECT_DEATH(raw[21] = ThreeInts(), "container-overflow"); + EXPECT_DEATH_IF_SUPPORTED(raw[21] = ThreeInts(), "container-overflow"); } -#endif // ADDRESS_SANITIZER +#endif // ABSL_HAVE_ADDRESS_SANITIZER TEST(FixedArrayTest, AbslHashValueWorks) { using V = absl::FixedArray<int>; diff --git a/third_party/abseil-cpp/absl/container/flat_hash_map.h b/third_party/abseil-cpp/absl/container/flat_hash_map.h index fcb70d861f..74def0df0e 100644 --- a/third_party/abseil-cpp/absl/container/flat_hash_map.h +++ b/third_party/abseil-cpp/absl/container/flat_hash_map.h @@ -234,7 +234,8 @@ class flat_hash_map : public absl::container_internal::raw_hash_map< // // size_type erase(const key_type& key): // - // Erases the element with the matching key, if it exists. + // Erases the element with the matching key, if it exists, returning the + // number of elements erased (0 or 1). using Base::erase; // flat_hash_map::insert() @@ -383,6 +384,11 @@ class flat_hash_map : public absl::container_internal::raw_hash_map< // key value and returns a node handle owning that extracted data. If the // `flat_hash_map` does not contain an element with a matching key, this // function returns an empty node handle. + // + // NOTE: when compiled in an earlier version of C++ than C++17, + // `node_type::key()` returns a const reference to the key instead of a + // mutable reference. We cannot safely return a mutable reference without + // std::launder (which is not available before C++17). using Base::extract; // flat_hash_map::merge() diff --git a/third_party/abseil-cpp/absl/container/flat_hash_map_test.cc b/third_party/abseil-cpp/absl/container/flat_hash_map_test.cc index 728b693a07..8dda1d3539 100644 --- a/third_party/abseil-cpp/absl/container/flat_hash_map_test.cc +++ b/third_party/abseil-cpp/absl/container/flat_hash_map_test.cc @@ -16,6 +16,7 @@ #include <memory> +#include "absl/base/internal/raw_logging.h" #include "absl/container/internal/hash_generator_testing.h" #include "absl/container/internal/unordered_map_constructor_test.h" #include "absl/container/internal/unordered_map_lookup_test.h" @@ -34,6 +35,19 @@ using ::testing::IsEmpty; using ::testing::Pair; using ::testing::UnorderedElementsAre; +// Check that absl::flat_hash_map works in a global constructor. +struct BeforeMain { + BeforeMain() { + absl::flat_hash_map<int, int> x; + x.insert({1, 1}); + ABSL_RAW_CHECK(x.find(0) == x.end(), "x should not contain 0"); + auto it = x.find(1); + ABSL_RAW_CHECK(it != x.end(), "x should contain 1"); + ABSL_RAW_CHECK(it->second, "1 should map to 1"); + } +}; +const BeforeMain before_main; + template <class K, class V> using Map = flat_hash_map<K, V, StatefulTestingHash, StatefulTestingEqual, Alloc<std::pair<const K, V>>>; @@ -253,6 +267,47 @@ TEST(FlatHashMap, EraseIf) { } } +// This test requires std::launder for mutable key access in node handles. +#if defined(__cpp_lib_launder) && __cpp_lib_launder >= 201606 +TEST(FlatHashMap, NodeHandleMutableKeyAccess) { + flat_hash_map<std::string, std::string> map; + + map["key1"] = "mapped"; + + auto nh = map.extract(map.begin()); + nh.key().resize(3); + map.insert(std::move(nh)); + + EXPECT_THAT(map, testing::ElementsAre(Pair("key", "mapped"))); +} +#endif + +TEST(FlatHashMap, Reserve) { + // Verify that if we reserve(size() + n) then we can perform n insertions + // without a rehash, i.e., without invalidating any references. + for (size_t trial = 0; trial < 20; ++trial) { + for (size_t initial = 3; initial < 100; ++initial) { + // Fill in `initial` entries, then erase 2 of them, then reserve space for + // two inserts and check for reference stability while doing the inserts. + flat_hash_map<size_t, size_t> map; + for (size_t i = 0; i < initial; ++i) { + map[i] = i; + } + map.erase(0); + map.erase(1); + map.reserve(map.size() + 2); + size_t& a2 = map[2]; + // In the event of a failure, asan will complain in one of these two + // assignments. + map[initial] = a2; + map[initial + 1] = a2; + // Fail even when not under asan: + size_t& a2new = map[2]; + EXPECT_EQ(&a2, &a2new); + } + } +} + } // namespace } // namespace container_internal ABSL_NAMESPACE_END diff --git a/third_party/abseil-cpp/absl/container/flat_hash_set.h b/third_party/abseil-cpp/absl/container/flat_hash_set.h index 94be6e3d13..6b89da6571 100644 --- a/third_party/abseil-cpp/absl/container/flat_hash_set.h +++ b/third_party/abseil-cpp/absl/container/flat_hash_set.h @@ -227,7 +227,8 @@ class flat_hash_set // // size_type erase(const key_type& key): // - // Erases the element with the matching key, if it exists. + // Erases the element with the matching key, if it exists, returning the + // number of elements erased (0 or 1). using Base::erase; // flat_hash_set::insert() @@ -323,7 +324,7 @@ class flat_hash_set // flat_hash_set::merge() // - // Extracts elements from a given `source` flat hash map into this + // Extracts elements from a given `source` flat hash set into this // `flat_hash_set`. If the destination `flat_hash_set` already contains an // element with an equivalent key, that element is not extracted. using Base::merge; diff --git a/third_party/abseil-cpp/absl/container/flat_hash_set_test.cc b/third_party/abseil-cpp/absl/container/flat_hash_set_test.cc index 40d7f85c5d..8f6f9944ca 100644 --- a/third_party/abseil-cpp/absl/container/flat_hash_set_test.cc +++ b/third_party/abseil-cpp/absl/container/flat_hash_set_test.cc @@ -16,6 +16,7 @@ #include <vector> +#include "absl/base/internal/raw_logging.h" #include "absl/container/internal/hash_generator_testing.h" #include "absl/container/internal/unordered_set_constructor_test.h" #include "absl/container/internal/unordered_set_lookup_test.h" @@ -36,6 +37,17 @@ using ::testing::Pointee; using ::testing::UnorderedElementsAre; using ::testing::UnorderedElementsAreArray; +// Check that absl::flat_hash_set works in a global constructor. +struct BeforeMain { + BeforeMain() { + absl::flat_hash_set<int> x; + x.insert(1); + ABSL_RAW_CHECK(!x.contains(0), "x should not contain 0"); + ABSL_RAW_CHECK(x.contains(1), "x should contain 1"); + } +}; +const BeforeMain before_main; + template <class T> using Set = absl::flat_hash_set<T, StatefulTestingHash, StatefulTestingEqual, Alloc<T>>; diff --git a/third_party/abseil-cpp/absl/container/inlined_vector.h b/third_party/abseil-cpp/absl/container/inlined_vector.h index 2388d471dc..df9e09917d 100644 --- a/third_party/abseil-cpp/absl/container/inlined_vector.h +++ b/third_party/abseil-cpp/absl/container/inlined_vector.h @@ -48,6 +48,7 @@ #include "absl/algorithm/algorithm.h" #include "absl/base/internal/throw_delegate.h" +#include "absl/base/macros.h" #include "absl/base/optimization.h" #include "absl/base/port.h" #include "absl/container/internal/inlined_vector.h" @@ -63,7 +64,7 @@ ABSL_NAMESPACE_BEGIN // `std::vector` for use cases where the vector's size is sufficiently small // that it can be inlined. If the inlined vector does grow beyond its estimated // capacity, it will trigger an initial allocation on the heap, and will behave -// as a `std:vector`. The API of the `absl::InlinedVector` within this file is +// as a `std::vector`. The API of the `absl::InlinedVector` within this file is // 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 { @@ -71,37 +72,43 @@ class InlinedVector { using Storage = inlined_vector_internal::Storage<T, N, A>; - using AllocatorTraits = typename Storage::AllocatorTraits; - using RValueReference = typename Storage::RValueReference; - using MoveIterator = typename Storage::MoveIterator; - using IsMemcpyOk = typename Storage::IsMemcpyOk; + template <typename TheA> + using AllocatorTraits = inlined_vector_internal::AllocatorTraits<TheA>; + template <typename TheA> + using MoveIterator = inlined_vector_internal::MoveIterator<TheA>; + template <typename TheA> + using IsMemcpyOk = inlined_vector_internal::IsMemcpyOk<TheA>; - template <typename Iterator> + template <typename TheA, typename Iterator> using IteratorValueAdapter = - typename Storage::template IteratorValueAdapter<Iterator>; - using CopyValueAdapter = typename Storage::CopyValueAdapter; - using DefaultValueAdapter = typename Storage::DefaultValueAdapter; + inlined_vector_internal::IteratorValueAdapter<TheA, Iterator>; + template <typename TheA> + using CopyValueAdapter = inlined_vector_internal::CopyValueAdapter<TheA>; + template <typename TheA> + using DefaultValueAdapter = + inlined_vector_internal::DefaultValueAdapter<TheA>; template <typename Iterator> using EnableIfAtLeastForwardIterator = absl::enable_if_t< - inlined_vector_internal::IsAtLeastForwardIterator<Iterator>::value>; + inlined_vector_internal::IsAtLeastForwardIterator<Iterator>::value, int>; template <typename Iterator> using DisableIfAtLeastForwardIterator = absl::enable_if_t< - !inlined_vector_internal::IsAtLeastForwardIterator<Iterator>::value>; + !inlined_vector_internal::IsAtLeastForwardIterator<Iterator>::value, int>; public: - using allocator_type = typename Storage::allocator_type; - using value_type = typename Storage::value_type; - using pointer = typename Storage::pointer; - using const_pointer = typename Storage::const_pointer; - using size_type = typename Storage::size_type; - using difference_type = typename Storage::difference_type; - using reference = typename Storage::reference; - using const_reference = typename Storage::const_reference; - using iterator = typename Storage::iterator; - using const_iterator = typename Storage::const_iterator; - using reverse_iterator = typename Storage::reverse_iterator; - using const_reverse_iterator = typename Storage::const_reverse_iterator; + using allocator_type = A; + using value_type = inlined_vector_internal::ValueType<A>; + using pointer = inlined_vector_internal::Pointer<A>; + using const_pointer = inlined_vector_internal::ConstPointer<A>; + using size_type = inlined_vector_internal::SizeType<A>; + using difference_type = inlined_vector_internal::DifferenceType<A>; + using reference = inlined_vector_internal::Reference<A>; + using const_reference = inlined_vector_internal::ConstReference<A>; + using iterator = inlined_vector_internal::Iterator<A>; + using const_iterator = inlined_vector_internal::ConstIterator<A>; + using reverse_iterator = inlined_vector_internal::ReverseIterator<A>; + using const_reverse_iterator = + inlined_vector_internal::ConstReverseIterator<A>; // --------------------------------------------------------------------------- // InlinedVector Constructors and Destructor @@ -110,28 +117,28 @@ class InlinedVector { // Creates an empty inlined vector with a value-initialized allocator. InlinedVector() noexcept(noexcept(allocator_type())) : storage_() {} - // Creates an empty inlined vector with a copy of `alloc`. - explicit InlinedVector(const allocator_type& alloc) noexcept - : storage_(alloc) {} + // Creates an empty inlined vector with a copy of `allocator`. + explicit InlinedVector(const allocator_type& allocator) noexcept + : storage_(allocator) {} // Creates an inlined vector with `n` copies of `value_type()`. explicit InlinedVector(size_type n, - const allocator_type& alloc = allocator_type()) - : storage_(alloc) { - storage_.Initialize(DefaultValueAdapter(), n); + const allocator_type& allocator = allocator_type()) + : storage_(allocator) { + storage_.Initialize(DefaultValueAdapter<A>(), n); } // Creates an inlined vector with `n` copies of `v`. InlinedVector(size_type n, const_reference v, - const allocator_type& alloc = allocator_type()) - : storage_(alloc) { - storage_.Initialize(CopyValueAdapter(v), n); + const allocator_type& allocator = allocator_type()) + : storage_(allocator) { + storage_.Initialize(CopyValueAdapter<A>(std::addressof(v)), n); } // Creates an inlined vector with copies of the elements of `list`. InlinedVector(std::initializer_list<value_type> list, - const allocator_type& alloc = allocator_type()) - : InlinedVector(list.begin(), list.end(), alloc) {} + const allocator_type& allocator = allocator_type()) + : InlinedVector(list.begin(), list.end(), allocator) {} // Creates an inlined vector with elements constructed from the provided // forward iterator range [`first`, `last`). @@ -140,37 +147,40 @@ class InlinedVector { // this constructor with two integral arguments and a call to the above // `InlinedVector(size_type, const_reference)` constructor. template <typename ForwardIterator, - EnableIfAtLeastForwardIterator<ForwardIterator>* = nullptr> + EnableIfAtLeastForwardIterator<ForwardIterator> = 0> InlinedVector(ForwardIterator first, ForwardIterator last, - const allocator_type& alloc = allocator_type()) - : storage_(alloc) { - storage_.Initialize(IteratorValueAdapter<ForwardIterator>(first), + const allocator_type& allocator = allocator_type()) + : storage_(allocator) { + storage_.Initialize(IteratorValueAdapter<A, ForwardIterator>(first), std::distance(first, last)); } // Creates an inlined vector with elements constructed from the provided input // iterator range [`first`, `last`). template <typename InputIterator, - DisableIfAtLeastForwardIterator<InputIterator>* = nullptr> + DisableIfAtLeastForwardIterator<InputIterator> = 0> InlinedVector(InputIterator first, InputIterator last, - const allocator_type& alloc = allocator_type()) - : storage_(alloc) { + const allocator_type& allocator = allocator_type()) + : storage_(allocator) { std::copy(first, last, std::back_inserter(*this)); } // Creates an inlined vector by copying the contents of `other` using // `other`'s allocator. InlinedVector(const InlinedVector& other) - : InlinedVector(other, *other.storage_.GetAllocPtr()) {} - - // Creates an inlined vector by copying the contents of `other` using `alloc`. - InlinedVector(const InlinedVector& other, const allocator_type& alloc) - : storage_(alloc) { - if (IsMemcpyOk::value && !other.storage_.GetIsAllocated()) { + : InlinedVector(other, other.storage_.GetAllocator()) {} + + // Creates an inlined vector by copying the contents of `other` using the + // provided `allocator`. + InlinedVector(const InlinedVector& other, const allocator_type& allocator) + : storage_(allocator) { + if (other.empty()) { + // Empty; nothing to do. + } else if (IsMemcpyOk<A>::value && !other.storage_.GetIsAllocated()) { + // Memcpy-able and do not need allocation. storage_.MemcpyFrom(other.storage_); } else { - storage_.Initialize(IteratorValueAdapter<const_pointer>(other.data()), - other.size()); + storage_.InitFrom(other.storage_); } } @@ -191,23 +201,23 @@ class InlinedVector { InlinedVector(InlinedVector&& other) noexcept( absl::allocator_is_nothrow<allocator_type>::value || std::is_nothrow_move_constructible<value_type>::value) - : storage_(*other.storage_.GetAllocPtr()) { - if (IsMemcpyOk::value) { + : storage_(other.storage_.GetAllocator()) { + if (IsMemcpyOk<A>::value) { storage_.MemcpyFrom(other.storage_); other.storage_.SetInlinedSize(0); } else if (other.storage_.GetIsAllocated()) { - storage_.SetAllocatedData(other.storage_.GetAllocatedData(), - other.storage_.GetAllocatedCapacity()); + storage_.SetAllocation({other.storage_.GetAllocatedData(), + other.storage_.GetAllocatedCapacity()}); storage_.SetAllocatedSize(other.storage_.GetSize()); other.storage_.SetInlinedSize(0); } else { - IteratorValueAdapter<MoveIterator> other_values( - MoveIterator(other.storage_.GetInlinedData())); + IteratorValueAdapter<A, MoveIterator<A>> other_values( + MoveIterator<A>(other.storage_.GetInlinedData())); - inlined_vector_internal::ConstructElements( - storage_.GetAllocPtr(), storage_.GetInlinedData(), &other_values, + inlined_vector_internal::ConstructElements<A>( + storage_.GetAllocator(), storage_.GetInlinedData(), other_values, other.storage_.GetSize()); storage_.SetInlinedSize(other.storage_.GetSize()); @@ -215,30 +225,32 @@ class InlinedVector { } // Creates an inlined vector by moving in the contents of `other` with a copy - // of `alloc`. + // of `allocator`. // - // NOTE: if `other`'s allocator is not equal to `alloc`, even if `other` + // NOTE: if `other`'s allocator is not equal to `allocator`, even if `other` // contains allocated memory, this move constructor will still allocate. Since // allocation is performed, this constructor can only be `noexcept` if the // specified allocator is also `noexcept`. - InlinedVector(InlinedVector&& other, const allocator_type& alloc) noexcept( - absl::allocator_is_nothrow<allocator_type>::value) - : storage_(alloc) { - if (IsMemcpyOk::value) { + InlinedVector( + InlinedVector&& other, + const allocator_type& allocator) + noexcept(absl::allocator_is_nothrow<allocator_type>::value) + : storage_(allocator) { + if (IsMemcpyOk<A>::value) { storage_.MemcpyFrom(other.storage_); other.storage_.SetInlinedSize(0); - } else if ((*storage_.GetAllocPtr() == *other.storage_.GetAllocPtr()) && + } else if ((storage_.GetAllocator() == other.storage_.GetAllocator()) && other.storage_.GetIsAllocated()) { - storage_.SetAllocatedData(other.storage_.GetAllocatedData(), - other.storage_.GetAllocatedCapacity()); + storage_.SetAllocation({other.storage_.GetAllocatedData(), + other.storage_.GetAllocatedCapacity()}); storage_.SetAllocatedSize(other.storage_.GetSize()); other.storage_.SetInlinedSize(0); } else { - storage_.Initialize( - IteratorValueAdapter<MoveIterator>(MoveIterator(other.data())), - other.size()); + storage_.Initialize(IteratorValueAdapter<A, MoveIterator<A>>( + MoveIterator<A>(other.data())), + other.size()); } } @@ -307,16 +319,14 @@ class InlinedVector { // // Returns a `reference` to the `i`th element of the inlined vector. reference operator[](size_type i) { - assert(i < size()); - + ABSL_HARDENING_ASSERT(i < size()); return data()[i]; } // Overload of `InlinedVector::operator[](...)` that returns a // `const_reference` to the `i`th element of the inlined vector. const_reference operator[](size_type i) const { - assert(i < size()); - + ABSL_HARDENING_ASSERT(i < size()); return data()[i]; } @@ -331,7 +341,6 @@ class InlinedVector { base_internal::ThrowStdOutOfRange( "`InlinedVector::at(size_type)` failed bounds check"); } - return data()[i]; } @@ -345,7 +354,6 @@ class InlinedVector { base_internal::ThrowStdOutOfRange( "`InlinedVector::at(size_type) const` failed bounds check"); } - return data()[i]; } @@ -353,34 +361,30 @@ class InlinedVector { // // Returns a `reference` to the first element of the inlined vector. reference front() { - assert(!empty()); - - return at(0); + ABSL_HARDENING_ASSERT(!empty()); + return data()[0]; } // Overload of `InlinedVector::front()` that returns a `const_reference` to // the first element of the inlined vector. const_reference front() const { - assert(!empty()); - - return at(0); + ABSL_HARDENING_ASSERT(!empty()); + return data()[0]; } // `InlinedVector::back()` // // Returns a `reference` to the last element of the inlined vector. reference back() { - assert(!empty()); - - return at(size() - 1); + ABSL_HARDENING_ASSERT(!empty()); + return data()[size() - 1]; } // Overload of `InlinedVector::back()` that returns a `const_reference` to the // last element of the inlined vector. const_reference back() const { - assert(!empty()); - - return at(size() - 1); + ABSL_HARDENING_ASSERT(!empty()); + return data()[size() - 1]; } // `InlinedVector::begin()` @@ -447,7 +451,7 @@ class InlinedVector { // `InlinedVector::get_allocator()` // // Returns a copy of the inlined vector's allocator. - allocator_type get_allocator() const { return *storage_.GetAllocPtr(); } + allocator_type get_allocator() const { return storage_.GetAllocator(); } // --------------------------------------------------------------------------- // InlinedVector Member Mutators @@ -481,16 +485,16 @@ class InlinedVector { // unspecified state. InlinedVector& operator=(InlinedVector&& other) { if (ABSL_PREDICT_TRUE(this != std::addressof(other))) { - if (IsMemcpyOk::value || other.storage_.GetIsAllocated()) { - inlined_vector_internal::DestroyElements(storage_.GetAllocPtr(), data(), - size()); + if (IsMemcpyOk<A>::value || other.storage_.GetIsAllocated()) { + inlined_vector_internal::DestroyElements<A>(storage_.GetAllocator(), + data(), size()); storage_.DeallocateIfAllocated(); storage_.MemcpyFrom(other.storage_); other.storage_.SetInlinedSize(0); } else { - storage_.Assign(IteratorValueAdapter<MoveIterator>( - MoveIterator(other.storage_.GetInlinedData())), + storage_.Assign(IteratorValueAdapter<A, MoveIterator<A>>( + MoveIterator<A>(other.storage_.GetInlinedData())), other.size()); } } @@ -502,7 +506,7 @@ class InlinedVector { // // Replaces the contents of the inlined vector with `n` copies of `v`. void assign(size_type n, const_reference v) { - storage_.Assign(CopyValueAdapter(v), n); + storage_.Assign(CopyValueAdapter<A>(std::addressof(v)), n); } // Overload of `InlinedVector::assign(...)` that replaces the contents of the @@ -516,9 +520,9 @@ class InlinedVector { // // NOTE: this overload is for iterators that are "forward" category or better. template <typename ForwardIterator, - EnableIfAtLeastForwardIterator<ForwardIterator>* = nullptr> + EnableIfAtLeastForwardIterator<ForwardIterator> = 0> void assign(ForwardIterator first, ForwardIterator last) { - storage_.Assign(IteratorValueAdapter<ForwardIterator>(first), + storage_.Assign(IteratorValueAdapter<A, ForwardIterator>(first), std::distance(first, last)); } @@ -527,11 +531,11 @@ class InlinedVector { // // NOTE: this overload is for iterators that are "input" category. template <typename InputIterator, - DisableIfAtLeastForwardIterator<InputIterator>* = nullptr> + DisableIfAtLeastForwardIterator<InputIterator> = 0> void assign(InputIterator first, InputIterator last) { size_type i = 0; for (; i < size() && first != last; ++i, static_cast<void>(++first)) { - at(i) = *first; + data()[i] = *first; } erase(data() + i, data() + size()); @@ -542,9 +546,12 @@ class InlinedVector { // // Resizes the inlined vector to contain `n` elements. // - // NOTE: if `n` is smaller than `size()`, extra elements are destroyed. If `n` + // NOTE: If `n` is smaller than `size()`, extra elements are destroyed. If `n` // is larger than `size()`, new elements are value-initialized. - void resize(size_type n) { storage_.Resize(DefaultValueAdapter(), n); } + void resize(size_type n) { + ABSL_HARDENING_ASSERT(n <= max_size()); + storage_.Resize(DefaultValueAdapter<A>(), n); + } // Overload of `InlinedVector::resize(...)` that resizes the inlined vector to // contain `n` elements. @@ -552,7 +559,8 @@ class InlinedVector { // NOTE: if `n` is smaller than `size()`, extra elements are destroyed. If `n` // is larger than `size()`, new elements are copied-constructed from `v`. void resize(size_type n, const_reference v) { - storage_.Resize(CopyValueAdapter(v), n); + ABSL_HARDENING_ASSERT(n <= max_size()); + storage_.Resize(CopyValueAdapter<A>(std::addressof(v)), n); } // `InlinedVector::insert(...)` @@ -565,7 +573,7 @@ class InlinedVector { // Overload of `InlinedVector::insert(...)` that inserts `v` at `pos` using // move semantics, returning an `iterator` to the newly inserted element. - iterator insert(const_iterator pos, RValueReference v) { + iterator insert(const_iterator pos, value_type&& v) { return emplace(pos, std::move(v)); } @@ -573,12 +581,13 @@ class InlinedVector { // of `v` starting at `pos`, returning an `iterator` pointing to the first of // the newly inserted elements. iterator insert(const_iterator pos, size_type n, const_reference v) { - assert(pos >= begin()); - assert(pos <= end()); + ABSL_HARDENING_ASSERT(pos >= begin()); + ABSL_HARDENING_ASSERT(pos <= end()); if (ABSL_PREDICT_TRUE(n != 0)) { value_type dealias = v; - return storage_.Insert(pos, CopyValueAdapter(dealias), n); + return storage_.Insert(pos, CopyValueAdapter<A>(std::addressof(dealias)), + n); } else { return const_cast<iterator>(pos); } @@ -597,14 +606,15 @@ class InlinedVector { // // NOTE: this overload is for iterators that are "forward" category or better. template <typename ForwardIterator, - EnableIfAtLeastForwardIterator<ForwardIterator>* = nullptr> + EnableIfAtLeastForwardIterator<ForwardIterator> = 0> iterator insert(const_iterator pos, ForwardIterator first, ForwardIterator last) { - assert(pos >= begin()); - assert(pos <= end()); + ABSL_HARDENING_ASSERT(pos >= begin()); + ABSL_HARDENING_ASSERT(pos <= end()); if (ABSL_PREDICT_TRUE(first != last)) { - return storage_.Insert(pos, IteratorValueAdapter<ForwardIterator>(first), + return storage_.Insert(pos, + IteratorValueAdapter<A, ForwardIterator>(first), std::distance(first, last)); } else { return const_cast<iterator>(pos); @@ -617,10 +627,10 @@ class InlinedVector { // // NOTE: this overload is for iterators that are "input" category. template <typename InputIterator, - DisableIfAtLeastForwardIterator<InputIterator>* = nullptr> + DisableIfAtLeastForwardIterator<InputIterator> = 0> iterator insert(const_iterator pos, InputIterator first, InputIterator last) { - assert(pos >= begin()); - assert(pos <= end()); + ABSL_HARDENING_ASSERT(pos >= begin()); + ABSL_HARDENING_ASSERT(pos <= end()); size_type index = std::distance(cbegin(), pos); for (size_type i = index; first != last; ++i, static_cast<void>(++first)) { @@ -636,13 +646,13 @@ class InlinedVector { // `pos`, returning an `iterator` pointing to the newly emplaced element. template <typename... Args> iterator emplace(const_iterator pos, Args&&... args) { - assert(pos >= begin()); - assert(pos <= end()); + ABSL_HARDENING_ASSERT(pos >= begin()); + ABSL_HARDENING_ASSERT(pos <= end()); value_type dealias(std::forward<Args>(args)...); return storage_.Insert(pos, - IteratorValueAdapter<MoveIterator>( - MoveIterator(std::addressof(dealias))), + IteratorValueAdapter<A, MoveIterator<A>>( + MoveIterator<A>(std::addressof(dealias))), 1); } @@ -662,7 +672,7 @@ class InlinedVector { // Overload of `InlinedVector::push_back(...)` for inserting `v` at `end()` // using move semantics. - void push_back(RValueReference v) { + void push_back(value_type&& v) { static_cast<void>(emplace_back(std::move(v))); } @@ -670,9 +680,9 @@ class InlinedVector { // // Destroys the element at `back()`, reducing the size by `1`. void pop_back() noexcept { - assert(!empty()); + ABSL_HARDENING_ASSERT(!empty()); - AllocatorTraits::destroy(*storage_.GetAllocPtr(), data() + (size() - 1)); + AllocatorTraits<A>::destroy(storage_.GetAllocator(), data() + (size() - 1)); storage_.SubtractSize(1); } @@ -683,8 +693,8 @@ class InlinedVector { // // NOTE: may return `end()`, which is not dereferencable. iterator erase(const_iterator pos) { - assert(pos >= begin()); - assert(pos < end()); + ABSL_HARDENING_ASSERT(pos >= begin()); + ABSL_HARDENING_ASSERT(pos < end()); return storage_.Erase(pos, pos + 1); } @@ -695,9 +705,9 @@ class InlinedVector { // // NOTE: may return `end()`, which is not dereferencable. iterator erase(const_iterator from, const_iterator to) { - assert(from >= begin()); - assert(from <= to); - assert(to <= end()); + ABSL_HARDENING_ASSERT(from >= begin()); + ABSL_HARDENING_ASSERT(from <= to); + ABSL_HARDENING_ASSERT(to <= end()); if (ABSL_PREDICT_TRUE(from != to)) { return storage_.Erase(from, to); @@ -711,8 +721,8 @@ class InlinedVector { // Destroys all elements in the inlined vector, setting the size to `0` and // deallocating any held memory. void clear() noexcept { - inlined_vector_internal::DestroyElements(storage_.GetAllocPtr(), data(), - size()); + inlined_vector_internal::DestroyElements<A>(storage_.GetAllocator(), data(), + size()); storage_.DeallocateIfAllocated(); storage_.SetInlinedSize(0); @@ -725,15 +735,12 @@ class InlinedVector { // `InlinedVector::shrink_to_fit()` // - // Reduces memory usage by freeing unused memory. After being called, calls to - // `capacity()` will be equal to `max(N, size())`. - // - // If `size() <= N` and the inlined vector contains allocated memory, the - // elements will all be moved to the inlined space and the allocated memory - // will be deallocated. + // Attempts to reduce memory usage by moving elements to (or keeping elements + // in) the smallest available buffer sufficient for containing `size()` + // elements. // - // If `size() > N` and `size() < capacity()`, the elements will be moved to a - // smaller allocation. + // If `size()` is sufficiently small, the elements will be moved into (or kept + // in) the inlined space. void shrink_to_fit() { if (storage_.GetIsAllocated()) { storage_.ShrinkToFit(); diff --git a/third_party/abseil-cpp/absl/container/inlined_vector_benchmark.cc b/third_party/abseil-cpp/absl/container/inlined_vector_benchmark.cc index 3f2b4ed28a..e256fad60f 100644 --- a/third_party/abseil-cpp/absl/container/inlined_vector_benchmark.cc +++ b/third_party/abseil-cpp/absl/container/inlined_vector_benchmark.cc @@ -83,7 +83,7 @@ int GetNonShortStringOptimizationSize() { } ABSL_RAW_LOG( FATAL, - "Failed to find a std::string larger than the short std::string optimization"); + "Failed to find a string larger than the short string optimization"); return -1; } @@ -534,6 +534,28 @@ void BM_ConstructFromMove(benchmark::State& state) { ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_ConstructFromMove, TrivialType); ABSL_INTERNAL_BENCHMARK_ONE_SIZE(BM_ConstructFromMove, NontrivialType); +// Measure cost of copy-constructor+destructor. +void BM_CopyTrivial(benchmark::State& state) { + const int n = state.range(0); + InlVec<int64_t> src(n); + for (auto s : state) { + InlVec<int64_t> copy(src); + benchmark::DoNotOptimize(copy); + } +} +BENCHMARK(BM_CopyTrivial)->Arg(0)->Arg(1)->Arg(kLargeSize); + +// Measure cost of copy-constructor+destructor. +void BM_CopyNonTrivial(benchmark::State& state) { + const int n = state.range(0); + InlVec<InlVec<int64_t>> src(n); + for (auto s : state) { + InlVec<InlVec<int64_t>> copy(src); + benchmark::DoNotOptimize(copy); + } +} +BENCHMARK(BM_CopyNonTrivial)->Arg(0)->Arg(1)->Arg(kLargeSize); + template <typename T, size_t FromSize, size_t ToSize> void BM_AssignSizeRef(benchmark::State& state) { auto size = ToSize; diff --git a/third_party/abseil-cpp/absl/container/inlined_vector_test.cc b/third_party/abseil-cpp/absl/container/inlined_vector_test.cc index 2c9b0d0e03..98aff33498 100644 --- a/third_party/abseil-cpp/absl/container/inlined_vector_test.cc +++ b/third_party/abseil-cpp/absl/container/inlined_vector_test.cc @@ -30,6 +30,7 @@ #include "absl/base/internal/exception_testing.h" #include "absl/base/internal/raw_logging.h" #include "absl/base/macros.h" +#include "absl/base/options.h" #include "absl/container/internal/counting_allocator.h" #include "absl/container/internal/test_instance_tracker.h" #include "absl/hash/hash_testing.h" @@ -247,6 +248,16 @@ TEST(IntVec, Erase) { } } +TEST(IntVec, Hardened) { + IntVec v; + Fill(&v, 10); + EXPECT_EQ(v[9], 9); +#if !defined(NDEBUG) || ABSL_OPTION_HARDENED + EXPECT_DEATH_IF_SUPPORTED(v[10], ""); + EXPECT_DEATH_IF_SUPPORTED(v[-1], ""); +#endif +} + // At the end of this test loop, the elements between [erase_begin, erase_end) // should have reference counts == 0, and all others elements should have // reference counts == 1. @@ -725,22 +736,26 @@ TEST(OverheadTest, Storage) { // In particular, ensure that std::allocator doesn't cost anything to store. // The union should be absorbing some of the allocation bookkeeping overhead // in the larger vectors, leaving only the size_ field as overhead. - EXPECT_EQ(2 * sizeof(int*), - sizeof(absl::InlinedVector<int*, 1>) - 1 * sizeof(int*)); - EXPECT_EQ(1 * sizeof(int*), - sizeof(absl::InlinedVector<int*, 2>) - 2 * sizeof(int*)); - EXPECT_EQ(1 * sizeof(int*), - sizeof(absl::InlinedVector<int*, 3>) - 3 * sizeof(int*)); - EXPECT_EQ(1 * sizeof(int*), - sizeof(absl::InlinedVector<int*, 4>) - 4 * sizeof(int*)); - EXPECT_EQ(1 * sizeof(int*), - sizeof(absl::InlinedVector<int*, 5>) - 5 * sizeof(int*)); - EXPECT_EQ(1 * sizeof(int*), - sizeof(absl::InlinedVector<int*, 6>) - 6 * sizeof(int*)); - EXPECT_EQ(1 * sizeof(int*), - sizeof(absl::InlinedVector<int*, 7>) - 7 * sizeof(int*)); - EXPECT_EQ(1 * sizeof(int*), - sizeof(absl::InlinedVector<int*, 8>) - 8 * sizeof(int*)); + + struct T { void* val; }; + size_t expected_overhead = sizeof(T); + + EXPECT_EQ((2 * expected_overhead), + sizeof(absl::InlinedVector<T, 1>) - sizeof(T[1])); + EXPECT_EQ(expected_overhead, + sizeof(absl::InlinedVector<T, 2>) - sizeof(T[2])); + EXPECT_EQ(expected_overhead, + sizeof(absl::InlinedVector<T, 3>) - sizeof(T[3])); + EXPECT_EQ(expected_overhead, + sizeof(absl::InlinedVector<T, 4>) - sizeof(T[4])); + EXPECT_EQ(expected_overhead, + sizeof(absl::InlinedVector<T, 5>) - sizeof(T[5])); + EXPECT_EQ(expected_overhead, + sizeof(absl::InlinedVector<T, 6>) - sizeof(T[6])); + EXPECT_EQ(expected_overhead, + sizeof(absl::InlinedVector<T, 7>) - sizeof(T[7])); + EXPECT_EQ(expected_overhead, + sizeof(absl::InlinedVector<T, 8>) - sizeof(T[8])); } TEST(IntVec, Clear) { @@ -780,7 +795,7 @@ TEST(IntVec, Reserve) { TEST(StringVec, SelfRefPushBack) { std::vector<std::string> std_v; absl::InlinedVector<std::string, 4> v; - const std::string s = "A quite long std::string to ensure heap."; + const std::string s = "A quite long string to ensure heap."; std_v.push_back(s); v.push_back(s); for (int i = 0; i < 20; ++i) { @@ -795,7 +810,7 @@ TEST(StringVec, SelfRefPushBack) { TEST(StringVec, SelfRefPushBackWithMove) { std::vector<std::string> std_v; absl::InlinedVector<std::string, 4> v; - const std::string s = "A quite long std::string to ensure heap."; + const std::string s = "A quite long string to ensure heap."; std_v.push_back(s); v.push_back(s); for (int i = 0; i < 20; ++i) { @@ -808,7 +823,7 @@ TEST(StringVec, SelfRefPushBackWithMove) { } TEST(StringVec, SelfMove) { - const std::string s = "A quite long std::string to ensure heap."; + const std::string s = "A quite long string to ensure heap."; for (int len = 0; len < 20; len++) { SCOPED_TRACE(len); absl::InlinedVector<std::string, 8> v; diff --git a/third_party/abseil-cpp/absl/container/internal/btree.h b/third_party/abseil-cpp/absl/container/internal/btree.h index fd5c0e7aba..f636c5fc73 100644 --- a/third_party/abseil-cpp/absl/container/internal/btree.h +++ b/third_party/abseil-cpp/absl/container/internal/btree.h @@ -65,6 +65,7 @@ #include "absl/container/internal/layout.h" #include "absl/memory/memory.h" #include "absl/meta/type_traits.h" +#include "absl/strings/cord.h" #include "absl/strings/string_view.h" #include "absl/types/compare.h" #include "absl/utility/utility.h" @@ -87,12 +88,30 @@ struct StringBtreeDefaultLess { // Compatibility constructor. StringBtreeDefaultLess(std::less<std::string>) {} // NOLINT - StringBtreeDefaultLess(std::less<string_view>) {} // NOLINT + StringBtreeDefaultLess(std::less<absl::string_view>) {} // NOLINT + + // Allow converting to std::less for use in key_comp()/value_comp(). + explicit operator std::less<std::string>() const { return {}; } + explicit operator std::less<absl::string_view>() const { return {}; } + explicit operator std::less<absl::Cord>() const { return {}; } absl::weak_ordering operator()(absl::string_view lhs, absl::string_view rhs) const { return compare_internal::compare_result_as_ordering(lhs.compare(rhs)); } + StringBtreeDefaultLess(std::less<absl::Cord>) {} // NOLINT + absl::weak_ordering operator()(const absl::Cord &lhs, + const absl::Cord &rhs) const { + return compare_internal::compare_result_as_ordering(lhs.Compare(rhs)); + } + absl::weak_ordering operator()(const absl::Cord &lhs, + absl::string_view rhs) const { + return compare_internal::compare_result_as_ordering(lhs.Compare(rhs)); + } + absl::weak_ordering operator()(absl::string_view lhs, + const absl::Cord &rhs) const { + return compare_internal::compare_result_as_ordering(-rhs.Compare(lhs)); + } }; struct StringBtreeDefaultGreater { @@ -101,23 +120,41 @@ struct StringBtreeDefaultGreater { StringBtreeDefaultGreater() = default; StringBtreeDefaultGreater(std::greater<std::string>) {} // NOLINT - StringBtreeDefaultGreater(std::greater<string_view>) {} // NOLINT + StringBtreeDefaultGreater(std::greater<absl::string_view>) {} // NOLINT + + // Allow converting to std::greater for use in key_comp()/value_comp(). + explicit operator std::greater<std::string>() const { return {}; } + explicit operator std::greater<absl::string_view>() const { return {}; } + explicit operator std::greater<absl::Cord>() const { return {}; } absl::weak_ordering operator()(absl::string_view lhs, absl::string_view rhs) const { return compare_internal::compare_result_as_ordering(rhs.compare(lhs)); } + StringBtreeDefaultGreater(std::greater<absl::Cord>) {} // NOLINT + absl::weak_ordering operator()(const absl::Cord &lhs, + const absl::Cord &rhs) const { + return compare_internal::compare_result_as_ordering(rhs.Compare(lhs)); + } + absl::weak_ordering operator()(const absl::Cord &lhs, + absl::string_view rhs) const { + return compare_internal::compare_result_as_ordering(-lhs.Compare(rhs)); + } + absl::weak_ordering operator()(absl::string_view lhs, + const absl::Cord &rhs) const { + return compare_internal::compare_result_as_ordering(rhs.Compare(lhs)); + } }; // A helper class to convert a boolean comparison into a three-way "compare-to" -// comparison that returns a negative value to indicate less-than, zero to -// indicate equality and a positive value to indicate greater-than. This helper +// comparison that returns an `absl::weak_ordering`. This helper // class is specialized for less<std::string>, greater<std::string>, -// less<string_view>, and greater<string_view>. +// less<string_view>, greater<string_view>, less<absl::Cord>, and +// greater<absl::Cord>. // // key_compare_to_adapter is provided so that btree users // automatically get the more efficient compare-to code when using common -// google string types with common comparison functors. +// Abseil string types with common comparison functors. // These string-like specializations also turn on heterogeneous lookup by // default. template <typename Compare> @@ -145,10 +182,54 @@ struct key_compare_to_adapter<std::greater<absl::string_view>> { using type = StringBtreeDefaultGreater; }; +template <> +struct key_compare_to_adapter<std::less<absl::Cord>> { + using type = StringBtreeDefaultLess; +}; + +template <> +struct key_compare_to_adapter<std::greater<absl::Cord>> { + using type = StringBtreeDefaultGreater; +}; + +// Detects an 'absl_btree_prefer_linear_node_search' member. This is +// a protocol used as an opt-in or opt-out of linear search. +// +// For example, this would be useful for key types that wrap an integer +// and define their own cheap operator<(). For example: +// +// class K { +// public: +// using absl_btree_prefer_linear_node_search = std::true_type; +// ... +// private: +// friend bool operator<(K a, K b) { return a.k_ < b.k_; } +// int k_; +// }; +// +// btree_map<K, V> m; // Uses linear search +// +// If T has the preference tag, then it has a preference. +// Btree will use the tag's truth value. +template <typename T, typename = void> +struct has_linear_node_search_preference : std::false_type {}; +template <typename T, typename = void> +struct prefers_linear_node_search : std::false_type {}; +template <typename T> +struct has_linear_node_search_preference< + T, absl::void_t<typename T::absl_btree_prefer_linear_node_search>> + : std::true_type {}; +template <typename T> +struct prefers_linear_node_search< + T, absl::void_t<typename T::absl_btree_prefer_linear_node_search>> + : T::absl_btree_prefer_linear_node_search {}; + template <typename Key, typename Compare, typename Alloc, int TargetNodeSize, bool Multi, typename SlotPolicy> struct common_params { - // If Compare is a common comparator for a std::string-like type, then we adapt it + using original_key_compare = Compare; + + // If Compare is a common comparator for a string-like type, then we adapt it // to use heterogeneous lookup and to be a key-compare-to comparator. using key_compare = typename key_compare_to_adapter<Compare>::type; // A type which indicates if we have a key-compare-to functor or a plain old @@ -160,9 +241,6 @@ struct common_params { using size_type = std::make_signed<size_t>::type; using difference_type = ptrdiff_t; - // True if this is a multiset or multimap. - using is_multi_container = std::integral_constant<bool, Multi>; - using slot_policy = SlotPolicy; using slot_type = typename slot_policy::slot_type; using value_type = typename slot_policy::value_type; @@ -172,6 +250,23 @@ struct common_params { using reference = value_type &; using const_reference = const value_type &; + // For the given lookup key type, returns whether we can have multiple + // equivalent keys in the btree. If this is a multi-container, then we can. + // Otherwise, we can have multiple equivalent keys only if all of the + // following conditions are met: + // - The comparator is transparent. + // - The lookup key type is not the same as key_type. + // - The comparator is not a StringBtreeDefault{Less,Greater} comparator + // that we know has the same equivalence classes for all lookup types. + template <typename LookupKey> + constexpr static bool can_have_multiple_equivalent_keys() { + return Multi || + (IsTransparent<key_compare>::value && + !std::is_same<LookupKey, Key>::value && + !std::is_same<key_compare, StringBtreeDefaultLess>::value && + !std::is_same<key_compare, StringBtreeDefaultGreater>::value); + } + enum { kTargetNodeSize = TargetNodeSize, @@ -217,10 +312,6 @@ struct common_params { static void move(Alloc *alloc, slot_type *src, slot_type *dest) { slot_policy::move(alloc, src, dest); } - static void move(Alloc *alloc, slot_type *first, slot_type *last, - slot_type *result) { - slot_policy::move(alloc, first, last, result); - } }; // A parameters structure for holding the type parameters for a btree_map. @@ -238,23 +329,36 @@ struct map_params : common_params<Key, Compare, Alloc, TargetNodeSize, Multi, using value_type = typename super_type::value_type; using init_type = typename super_type::init_type; - using key_compare = typename super_type::key_compare; - // Inherit from key_compare for empty base class optimization. - struct value_compare : private key_compare { - value_compare() = default; - explicit value_compare(const key_compare &cmp) : key_compare(cmp) {} + using original_key_compare = typename super_type::original_key_compare; + // Reference: https://en.cppreference.com/w/cpp/container/map/value_compare + class value_compare { + template <typename Params> + friend class btree; + + protected: + explicit value_compare(original_key_compare c) : comp(std::move(c)) {} - template <typename T, typename U> - auto operator()(const T &left, const U &right) const - -> decltype(std::declval<key_compare>()(left.first, right.first)) { - return key_compare::operator()(left.first, right.first); + original_key_compare comp; // NOLINT + + public: + auto operator()(const value_type &lhs, const value_type &rhs) const + -> decltype(comp(lhs.first, rhs.first)) { + return comp(lhs.first, rhs.first); } }; using is_map_container = std::true_type; - static const Key &key(const value_type &x) { return x.first; } - static const Key &key(const init_type &x) { return x.first; } - static const Key &key(const slot_type *x) { return slot_policy::key(x); } + template <typename V> + static auto key(const V &value) -> decltype(value.first) { + return value.first; + } + static const Key &key(const slot_type *s) { return slot_policy::key(s); } + static const Key &key(slot_type *s) { return slot_policy::key(s); } + // For use in node handle. + static auto mutable_key(slot_type *s) + -> decltype(slot_policy::mutable_key(s)) { + return slot_policy::mutable_key(s); + } static mapped_type &value(value_type *value) { return value->second; } }; @@ -295,13 +399,6 @@ struct set_slot_policy { static void move(Alloc * /*alloc*/, slot_type *src, slot_type *dest) { *dest = std::move(*src); } - - template <typename Alloc> - static void move(Alloc *alloc, slot_type *first, slot_type *last, - slot_type *result) { - for (slot_type *src = first, *dest = result; src != last; ++src, ++dest) - move(alloc, src, dest); - } }; // A parameters structure for holding the type parameters for a btree_set. @@ -312,11 +409,14 @@ struct set_params : common_params<Key, Compare, Alloc, TargetNodeSize, Multi, set_slot_policy<Key>> { using value_type = Key; using slot_type = typename set_params::common_params::slot_type; - using value_compare = typename set_params::common_params::key_compare; + using value_compare = + typename set_params::common_params::original_key_compare; using is_map_container = std::false_type; - static const Key &key(const value_type &x) { return x; } - static const Key &key(const slot_type *x) { return *x; } + template <typename V> + static const V &key(const V &value) { return value; } + static const Key &key(const slot_type *slot) { return *slot; } + static const Key &key(slot_type *slot) { return *slot; } }; // An adapter class that converts a lower-bound compare into an upper-bound @@ -326,8 +426,8 @@ struct set_params : common_params<Key, Compare, Alloc, TargetNodeSize, Multi, template <typename Compare> struct upper_bound_adapter { explicit upper_bound_adapter(const Compare &c) : comp(c) {} - template <typename K, typename LK> - bool operator()(const K &a, const LK &b) const { + template <typename K1, typename K2> + bool operator()(const K1 &a, const K2 &b) const { // Returns true when a is not greater than b. return !compare_internal::compare_result_as_less_than(comp(b, a)); } @@ -352,6 +452,10 @@ struct SearchResult { // useful information. template <typename V> struct SearchResult<V, false> { + SearchResult() {} + explicit SearchResult(V value) : value(value) {} + SearchResult(V value, MatchKind /*match*/) : value(value) {} + V value; static constexpr bool HasMatch() { return false; } @@ -364,7 +468,6 @@ struct SearchResult<V, false> { template <typename Params> class btree_node { using is_key_compare_to = typename Params::is_key_compare_to; - using is_multi_container = typename Params::is_multi_container; using field_type = typename Params::node_count_type; using allocator_type = typename Params::allocator_type; using slot_type = typename Params::slot_type; @@ -382,18 +485,25 @@ class btree_node { using difference_type = typename Params::difference_type; // Btree decides whether to use linear node search as follows: + // - If the comparator expresses a preference, use that. + // - If the key expresses a preference, use that. // - If the key is arithmetic and the comparator is std::less or // std::greater, choose linear. // - Otherwise, choose binary. // TODO(ezb): Might make sense to add condition(s) based on node-size. using use_linear_search = std::integral_constant< bool, - std::is_arithmetic<key_type>::value && - (std::is_same<std::less<key_type>, key_compare>::value || - std::is_same<std::greater<key_type>, key_compare>::value)>; - - // This class is organized by gtl::Layout as if it had the following - // structure: + has_linear_node_search_preference<key_compare>::value + ? prefers_linear_node_search<key_compare>::value + : has_linear_node_search_preference<key_type>::value + ? prefers_linear_node_search<key_type>::value + : std::is_arithmetic<key_type>::value && + (std::is_same<std::less<key_type>, key_compare>::value || + std::is_same<std::greater<key_type>, + key_compare>::value)>; + + // This class is organized by absl::container_internal::Layout as if it had + // the following structure: // // A pointer to the node's parent. // btree_node *parent; // @@ -407,23 +517,23 @@ class btree_node { // // is the same as the count of values. // field_type finish; // // The maximum number of values the node can hold. This is an integer in - // // [1, kNodeValues] for root leaf nodes, kNodeValues for non-root leaf + // // [1, kNodeSlots] for root leaf nodes, kNodeSlots for non-root leaf // // nodes, and kInternalNodeMaxCount (as a sentinel value) for internal - // // nodes (even though there are still kNodeValues values in the node). + // // nodes (even though there are still kNodeSlots values in the node). // // TODO(ezb): make max_count use only 4 bits and record log2(capacity) // // to free extra bits for is_root, etc. // field_type max_count; // // // The array of values. The capacity is `max_count` for leaf nodes and - // // kNodeValues for internal nodes. Only the values in + // // kNodeSlots for internal nodes. Only the values in // // [start, finish) have been initialized and are valid. // slot_type values[max_count]; // // // The array of child pointers. The keys in children[i] are all less // // than key(i). The keys in children[i + 1] are all greater than key(i). - // // There are 0 children for leaf nodes and kNodeValues + 1 children for + // // There are 0 children for leaf nodes and kNodeSlots + 1 children for // // internal nodes. - // btree_node *children[kNodeValues + 1]; + // btree_node *children[kNodeSlots + 1]; // // This class is only constructed by EmptyNodeType. Normally, pointers to the // layout above are allocated, cast to btree_node*, and de-allocated within @@ -445,57 +555,62 @@ class btree_node { private: using layout_type = absl::container_internal::Layout<btree_node *, field_type, slot_type, btree_node *>; - constexpr static size_type SizeWithNValues(size_type n) { + constexpr static size_type SizeWithNSlots(size_type n) { return layout_type(/*parent*/ 1, /*position, start, finish, max_count*/ 4, - /*values*/ n, + /*slots*/ n, /*children*/ 0) .AllocSize(); } // A lower bound for the overhead of fields other than values in a leaf node. constexpr static size_type MinimumOverhead() { - return SizeWithNValues(1) - sizeof(value_type); + return SizeWithNSlots(1) - sizeof(value_type); } // Compute how many values we can fit onto a leaf node taking into account // padding. - constexpr static size_type NodeTargetValues(const int begin, const int end) { + constexpr static size_type NodeTargetSlots(const int begin, const int end) { return begin == end ? begin - : SizeWithNValues((begin + end) / 2 + 1) > + : SizeWithNSlots((begin + end) / 2 + 1) > params_type::kTargetNodeSize - ? NodeTargetValues(begin, (begin + end) / 2) - : NodeTargetValues((begin + end) / 2 + 1, end); + ? NodeTargetSlots(begin, (begin + end) / 2) + : NodeTargetSlots((begin + end) / 2 + 1, end); } enum { kTargetNodeSize = params_type::kTargetNodeSize, - kNodeTargetValues = NodeTargetValues(0, params_type::kTargetNodeSize), + kNodeTargetSlots = NodeTargetSlots(0, params_type::kTargetNodeSize), - // We need a minimum of 3 values per internal node in order to perform + // We need a minimum of 3 slots per internal node in order to perform // splitting (1 value for the two nodes involved in the split and 1 value - // propagated to the parent as the delimiter for the split). - kNodeValues = kNodeTargetValues >= 3 ? kNodeTargetValues : 3, + // propagated to the parent as the delimiter for the split). For performance + // reasons, we don't allow 3 slots-per-node due to bad worst case occupancy + // of 1/3 (for a node, not a b-tree). + kMinNodeSlots = 4, + + kNodeSlots = + kNodeTargetSlots >= kMinNodeSlots ? kNodeTargetSlots : kMinNodeSlots, // The node is internal (i.e. is not a leaf node) if and only if `max_count` // has this value. kInternalNodeMaxCount = 0, }; - // Leaves can have less than kNodeValues values. - constexpr static layout_type LeafLayout(const int max_values = kNodeValues) { + // Leaves can have less than kNodeSlots values. + constexpr static layout_type LeafLayout(const int slot_count = kNodeSlots) { return layout_type(/*parent*/ 1, /*position, start, finish, max_count*/ 4, - /*values*/ max_values, + /*slots*/ slot_count, /*children*/ 0); } constexpr static layout_type InternalLayout() { return layout_type(/*parent*/ 1, /*position, start, finish, max_count*/ 4, - /*values*/ kNodeValues, - /*children*/ kNodeValues + 1); + /*slots*/ kNodeSlots, + /*children*/ kNodeSlots + 1); } - constexpr static size_type LeafSize(const int max_values = kNodeValues) { - return LeafLayout(max_values).AllocSize(); + constexpr static size_type LeafSize(const int slot_count = kNodeSlots) { + return LeafLayout(slot_count).AllocSize(); } constexpr static size_type InternalSize() { return InternalLayout().AllocSize(); @@ -552,10 +667,10 @@ class btree_node { } field_type max_count() const { // Internal nodes have max_count==kInternalNodeMaxCount. - // Leaf nodes have max_count in [1, kNodeValues]. + // Leaf nodes have max_count in [1, kNodeSlots]. const field_type max_count = GetField<1>()[3]; return max_count == field_type{kInternalNodeMaxCount} - ? field_type{kNodeValues} + ? field_type{kNodeSlots} : max_count; } @@ -633,7 +748,7 @@ class btree_node { } ++s; } - return {s}; + return SearchResult<int, false>{s}; } // Returns the position of the first value whose key is not less than k using @@ -668,7 +783,7 @@ class btree_node { e = mid; } } - return {s}; + return SearchResult<int, false>{s}; } // Returns the position of the first value whose key is not less than k using @@ -677,7 +792,7 @@ class btree_node { SearchResult<int, true> binary_search_impl( const K &k, int s, int e, const CompareTo &comp, std::true_type /* IsCompareTo */) const { - if (is_multi_container::value) { + if (params_type::template can_have_multiple_equivalent_keys<K>()) { MatchKind exact_match = MatchKind::kNe; while (s != e) { const int mid = (s + e) >> 1; @@ -688,14 +803,14 @@ class btree_node { e = mid; if (c == 0) { // Need to return the first value whose key is not less than k, - // which requires continuing the binary search if this is a - // multi-container. + // which requires continuing the binary search if there could be + // multiple equivalent keys. exact_match = MatchKind::kEq; } } } return {s, exact_match}; - } else { // Not a multi-container. + } else { // Can't have multiple equivalent keys. while (s != e) { const int mid = (s + e) >> 1; const absl::weak_ordering c = comp(key(mid), k); @@ -716,14 +831,10 @@ class btree_node { template <typename... Args> void emplace_value(size_type i, allocator_type *alloc, Args &&... args); - // Removes the value at position i, shifting all existing values and children - // at positions > i to the left by 1. - void remove_value(int i, allocator_type *alloc); - - // Removes the values at positions [i, i + to_erase), shifting all values - // after that range to the left by to_erase. Does not change children at all. - void remove_values_ignore_children(int i, int to_erase, - allocator_type *alloc); + // Removes the values at positions [i, i + to_erase), shifting all existing + // values and children after that range to the left by to_erase. Clears all + // children between [i, i + to_erase). + void remove_values(field_type i, field_type to_erase, allocator_type *alloc); // Rebalances a node with its right sibling. void rebalance_right_to_left(int to_move, btree_node *right, @@ -735,75 +846,87 @@ class btree_node { void split(int insert_position, btree_node *dest, allocator_type *alloc); // Merges a node with its right sibling, moving all of the values and the - // delimiting key in the parent node onto itself. - void merge(btree_node *sibling, allocator_type *alloc); - - // Swap the contents of "this" and "src". - void swap(btree_node *src, allocator_type *alloc); + // delimiting key in the parent node onto itself, and deleting the src node. + void merge(btree_node *src, allocator_type *alloc); // Node allocation/deletion routines. - static btree_node *init_leaf(btree_node *n, btree_node *parent, - int max_count) { - n->set_parent(parent); - n->set_position(0); - n->set_start(0); - n->set_finish(0); - n->set_max_count(max_count); + void init_leaf(btree_node *parent, int max_count) { + set_parent(parent); + set_position(0); + set_start(0); + set_finish(0); + set_max_count(max_count); absl::container_internal::SanitizerPoisonMemoryRegion( - n->start_slot(), max_count * sizeof(slot_type)); - return n; + start_slot(), max_count * sizeof(slot_type)); } - static btree_node *init_internal(btree_node *n, btree_node *parent) { - init_leaf(n, parent, kNodeValues); + void init_internal(btree_node *parent) { + init_leaf(parent, kNodeSlots); // Set `max_count` to a sentinel value to indicate that this node is // internal. - n->set_max_count(kInternalNodeMaxCount); + set_max_count(kInternalNodeMaxCount); absl::container_internal::SanitizerPoisonMemoryRegion( - &n->mutable_child(n->start()), - (kNodeValues + 1) * sizeof(btree_node *)); - return n; - } - void destroy(allocator_type *alloc) { - for (int i = start(); i < finish(); ++i) { - value_destroy(i, alloc); - } + &mutable_child(start()), (kNodeSlots + 1) * sizeof(btree_node *)); } - public: - // Exposed only for tests. - static bool testonly_uses_linear_node_search() { - return use_linear_search::value; + static void deallocate(const size_type size, btree_node *node, + allocator_type *alloc) { + absl::container_internal::Deallocate<Alignment()>(alloc, node, size); } + // Deletes a node and all of its children. + static void clear_and_delete(btree_node *node, allocator_type *alloc); + private: template <typename... Args> - void value_init(const size_type i, allocator_type *alloc, Args &&... args) { + void value_init(const field_type i, allocator_type *alloc, Args &&... args) { absl::container_internal::SanitizerUnpoisonObject(slot(i)); params_type::construct(alloc, slot(i), std::forward<Args>(args)...); } - void value_destroy(const size_type i, allocator_type *alloc) { + void value_destroy(const field_type i, allocator_type *alloc) { params_type::destroy(alloc, slot(i)); absl::container_internal::SanitizerPoisonObject(slot(i)); } + void value_destroy_n(const field_type i, const field_type n, + allocator_type *alloc) { + for (slot_type *s = slot(i), *end = slot(i + n); s != end; ++s) { + params_type::destroy(alloc, s); + absl::container_internal::SanitizerPoisonObject(s); + } + } + + static void transfer(slot_type *dest, slot_type *src, allocator_type *alloc) { + absl::container_internal::SanitizerUnpoisonObject(dest); + params_type::transfer(alloc, dest, src); + absl::container_internal::SanitizerPoisonObject(src); + } + + // Transfers value from slot `src_i` in `src_node` to slot `dest_i` in `this`. + void transfer(const size_type dest_i, const size_type src_i, + btree_node *src_node, allocator_type *alloc) { + transfer(slot(dest_i), src_node->slot(src_i), alloc); + } - // Move n values starting at value i in this node into the values starting at - // value j in node x. - void uninitialized_move_n(const size_type n, const size_type i, - const size_type j, btree_node *x, - allocator_type *alloc) { - absl::container_internal::SanitizerUnpoisonMemoryRegion( - x->slot(j), n * sizeof(slot_type)); - for (slot_type *src = slot(i), *end = src + n, *dest = x->slot(j); + // Transfers `n` values starting at value `src_i` in `src_node` into the + // values starting at value `dest_i` in `this`. + void transfer_n(const size_type n, const size_type dest_i, + const size_type src_i, btree_node *src_node, + allocator_type *alloc) { + for (slot_type *src = src_node->slot(src_i), *end = src + n, + *dest = slot(dest_i); src != end; ++src, ++dest) { - params_type::construct(alloc, dest, src); + transfer(dest, src, alloc); } } - // Destroys a range of n values, starting at index i. - void value_destroy_n(const size_type i, const size_type n, - allocator_type *alloc) { - for (int j = 0; j < n; ++j) { - value_destroy(i + j, alloc); + // Same as above, except that we start at the end and work our way to the + // beginning. + void transfer_n_backward(const size_type n, const size_type dest_i, + const size_type src_i, btree_node *src_node, + allocator_type *alloc) { + for (slot_type *src = src_node->slot(src_i + n - 1), *end = src - n, + *dest = slot(dest_i + n - 1); + src != end; --src, --dest) { + transfer(dest, src, alloc); } } @@ -820,6 +943,7 @@ struct btree_iterator { using key_type = typename Node::key_type; using size_type = typename Node::size_type; using params_type = typename Node::params_type; + using is_map_container = typename params_type::is_map_container; using node_type = Node; using normal_node = typename std::remove_const<Node>::type; @@ -831,7 +955,7 @@ struct btree_iterator { using slot_type = typename params_type::slot_type; using iterator = - btree_iterator<normal_node, normal_reference, normal_pointer>; + btree_iterator<normal_node, normal_reference, normal_pointer>; using const_iterator = btree_iterator<const_node, const_reference, const_pointer>; @@ -848,20 +972,19 @@ struct btree_iterator { btree_iterator(Node *n, int p) : node(n), position(p) {} // NOTE: this SFINAE allows for implicit conversions from iterator to - // const_iterator, but it specifically avoids defining copy constructors so - // that btree_iterator can be trivially copyable. This is for performance and - // binary size reasons. + // const_iterator, but it specifically avoids hiding the copy constructor so + // that the trivial one will be used when possible. template <typename N, typename R, typename P, absl::enable_if_t< std::is_same<btree_iterator<N, R, P>, iterator>::value && std::is_same<btree_iterator, const_iterator>::value, int> = 0> - btree_iterator(const btree_iterator<N, R, P> &x) // NOLINT - : node(x.node), position(x.position) {} + btree_iterator(const btree_iterator<N, R, P> other) // NOLINT + : node(other.node), position(other.position) {} private: // This SFINAE allows explicit conversions from const_iterator to - // iterator, but also avoids defining a copy constructor. + // iterator, but also avoids hiding the copy constructor. // NOTE: the const_cast is safe because this constructor is only called by // non-const methods and the container owns the nodes. template <typename N, typename R, typename P, @@ -869,8 +992,8 @@ struct btree_iterator { std::is_same<btree_iterator<N, R, P>, const_iterator>::value && std::is_same<btree_iterator, iterator>::value, int> = 0> - explicit btree_iterator(const btree_iterator<N, R, P> &x) - : node(const_cast<node_type *>(x.node)), position(x.position) {} + explicit btree_iterator(const btree_iterator<N, R, P> other) + : node(const_cast<node_type *>(other.node)), position(other.position) {} // Increment/decrement the iterator. void increment() { @@ -890,16 +1013,27 @@ struct btree_iterator { void decrement_slow(); public: - bool operator==(const const_iterator &x) const { - return node == x.node && position == x.position; + bool operator==(const iterator &other) const { + return node == other.node && position == other.position; } - bool operator!=(const const_iterator &x) const { - return node != x.node || position != x.position; + bool operator==(const const_iterator &other) const { + return node == other.node && position == other.position; + } + bool operator!=(const iterator &other) const { + return node != other.node || position != other.position; + } + bool operator!=(const const_iterator &other) const { + return node != other.node || position != other.position; } // Accessors for the key/value the iterator is pointing at. - reference operator*() const { return node->value(position); } - pointer operator->() const { return &node->value(position); } + reference operator*() const { + ABSL_HARDENING_ASSERT(node != nullptr); + ABSL_HARDENING_ASSERT(node->start() <= position); + ABSL_HARDENING_ASSERT(node->finish() > position); + return node->value(position); + } + pointer operator->() const { return &operator*(); } btree_iterator &operator++() { increment(); @@ -921,6 +1055,8 @@ struct btree_iterator { } private: + friend iterator; + friend const_iterator; template <typename Params> friend class btree; template <typename Tree> @@ -931,8 +1067,6 @@ struct btree_iterator { friend class btree_map_container; template <typename Tree> friend class btree_multiset_container; - template <typename N, typename R, typename P> - friend struct btree_iterator; template <typename TreeType, typename CheckerType> friend class base_checker; @@ -942,7 +1076,8 @@ struct btree_iterator { // The node in the tree the iterator is pointing at. Node *node; // The position within the node of the tree the iterator is pointing at. - // TODO(ezb): make this a field_type + // NOTE: this is an int rather than a field_type because iterators can point + // to invalid positions (such as -1) in certain circumstances. int position; }; @@ -950,6 +1085,8 @@ template <typename Params> class btree { using node_type = btree_node<Params>; using is_key_compare_to = typename Params::is_key_compare_to; + using init_type = typename Params::init_type; + using field_type = typename node_type::field_type; // We use a static empty node for the root/leftmost/rightmost of empty btrees // in order to avoid branching in begin()/end(). @@ -984,9 +1121,9 @@ class btree { #endif } - enum { - kNodeValues = node_type::kNodeValues, - kMinNodeValues = kNodeValues / 2, + enum : uint32_t { + kNodeSlots = node_type::kNodeSlots, + kMinNodeValues = kNodeSlots / 2, }; struct node_stats { @@ -994,9 +1131,9 @@ class btree { node_stats(size_type l, size_type i) : leaf_nodes(l), internal_nodes(i) {} - node_stats &operator+=(const node_stats &x) { - leaf_nodes += x.leaf_nodes; - internal_nodes += x.internal_nodes; + node_stats &operator+=(const node_stats &other) { + leaf_nodes += other.leaf_nodes; + internal_nodes += other.internal_nodes; return *this; } @@ -1010,13 +1147,15 @@ class btree { using size_type = typename Params::size_type; using difference_type = typename Params::difference_type; using key_compare = typename Params::key_compare; + using original_key_compare = typename Params::original_key_compare; using value_compare = typename Params::value_compare; using allocator_type = typename Params::allocator_type; using reference = typename Params::reference; using const_reference = typename Params::const_reference; using pointer = typename Params::pointer; using const_pointer = typename Params::const_pointer; - using iterator = btree_iterator<node_type, reference, pointer>; + using iterator = + typename btree_iterator<node_type, reference, pointer>::iterator; using const_iterator = typename iterator::const_iterator; using reverse_iterator = std::reverse_iterator<iterator>; using const_reverse_iterator = std::reverse_iterator<const_iterator>; @@ -1028,28 +1167,46 @@ class btree { private: // For use in copy_or_move_values_in_order. - const value_type &maybe_move_from_iterator(const_iterator x) { return *x; } - value_type &&maybe_move_from_iterator(iterator x) { return std::move(*x); } + const value_type &maybe_move_from_iterator(const_iterator it) { return *it; } + value_type &&maybe_move_from_iterator(iterator it) { + // This is a destructive operation on the other container so it's safe for + // us to const_cast and move from the keys here even if it's a set. + return std::move(const_cast<value_type &>(*it)); + } // Copies or moves (depending on the template parameter) the values in - // x into this btree in their order in x. This btree must be empty before this - // method is called. This method is used in copy construction, copy - // assignment, and move assignment. + // other into this btree in their order in other. This btree must be empty + // before this method is called. This method is used in copy construction, + // copy assignment, and move assignment. template <typename Btree> - void copy_or_move_values_in_order(Btree *x); + void copy_or_move_values_in_order(Btree &other); // Validates that various assumptions/requirements are true at compile time. constexpr static bool static_assert_validation(); public: - btree(const key_compare &comp, const allocator_type &alloc); - - btree(const btree &x); - btree(btree &&x) noexcept - : root_(std::move(x.root_)), - rightmost_(absl::exchange(x.rightmost_, EmptyNode())), - size_(absl::exchange(x.size_, 0)) { - x.mutable_root() = EmptyNode(); + btree(const key_compare &comp, const allocator_type &alloc) + : root_(comp, alloc, EmptyNode()), rightmost_(EmptyNode()), size_(0) {} + + btree(const btree &other) : btree(other, other.allocator()) {} + btree(const btree &other, const allocator_type &alloc) + : btree(other.key_comp(), alloc) { + copy_or_move_values_in_order(other); + } + btree(btree &&other) noexcept + : root_(std::move(other.root_)), + rightmost_(absl::exchange(other.rightmost_, EmptyNode())), + size_(absl::exchange(other.size_, 0)) { + other.mutable_root() = EmptyNode(); + } + btree(btree &&other, const allocator_type &alloc) + : btree(other.key_comp(), alloc) { + if (alloc == other.allocator()) { + swap(other); + } else { + // Move values from `other` one at a time when allocators are different. + copy_or_move_values_in_order(other); + } } ~btree() { @@ -1059,9 +1216,9 @@ class btree { clear(); } - // Assign the contents of x to *this. - btree &operator=(const btree &x); - btree &operator=(btree &&x) noexcept; + // Assign the contents of other to *this. + btree &operator=(const btree &other); + btree &operator=(btree &&other) noexcept; iterator begin() { return iterator(leftmost()); } const_iterator begin() const { return const_iterator(leftmost()); } @@ -1078,17 +1235,22 @@ class btree { return const_reverse_iterator(begin()); } - // Finds the first element whose key is not less than key. + // Finds the first element whose key is not less than `key`. template <typename K> iterator lower_bound(const K &key) { - return internal_end(internal_lower_bound(key)); + return internal_end(internal_lower_bound(key).value); } template <typename K> const_iterator lower_bound(const K &key) const { - return internal_end(internal_lower_bound(key)); + return internal_end(internal_lower_bound(key).value); } - // Finds the first element whose key is greater than key. + // Finds the first element whose key is not less than `key` and also returns + // whether that element is equal to `key`. + template <typename K> + std::pair<iterator, bool> lower_bound_equal(const K &key) const; + + // Finds the first element whose key is greater than `key`. template <typename K> iterator upper_bound(const K &key) { return internal_end(internal_upper_bound(key)); @@ -1099,23 +1261,21 @@ class btree { } // Finds the range of values which compare equal to key. The first member of - // the returned pair is equal to lower_bound(key). The second member pair of - // the pair is equal to upper_bound(key). + // the returned pair is equal to lower_bound(key). The second member of the + // pair is equal to upper_bound(key). template <typename K> - std::pair<iterator, iterator> equal_range(const K &key) { - return {lower_bound(key), upper_bound(key)}; - } + std::pair<iterator, iterator> equal_range(const K &key); template <typename K> std::pair<const_iterator, const_iterator> equal_range(const K &key) const { - return {lower_bound(key), upper_bound(key)}; + return const_cast<btree *>(this)->equal_range(key); } // Inserts a value into the btree only if it does not already exist. The // boolean return value indicates whether insertion succeeded or failed. // Requirement: if `key` already exists in the btree, does not consume `args`. // Requirement: `key` is never referenced after consuming `args`. - template <typename... Args> - std::pair<iterator, bool> insert_unique(const key_type &key, Args &&... args); + template <typename K, typename... Args> + std::pair<iterator, bool> insert_unique(const K &key, Args &&... args); // Inserts with hint. Checks to see if the value should be placed immediately // before `position` in the tree. If so, then the insertion will take @@ -1123,14 +1283,23 @@ class btree { // logarithmic time as if a call to insert_unique() were made. // Requirement: if `key` already exists in the btree, does not consume `args`. // Requirement: `key` is never referenced after consuming `args`. - template <typename... Args> + template <typename K, typename... Args> std::pair<iterator, bool> insert_hint_unique(iterator position, - const key_type &key, + const K &key, Args &&... args); // Insert a range of values into the btree. + // Note: the first overload avoids constructing a value_type if the key + // already exists in the btree. + template <typename InputIterator, + typename = decltype(std::declval<const key_compare &>()( + params_type::key(*std::declval<InputIterator>()), + std::declval<const key_type &>()))> + void insert_iterator_unique(InputIterator b, InputIterator e, int); + // We need the second overload for cases in which we need to construct a + // value_type in order to compare it with the keys already in the btree. template <typename InputIterator> - void insert_iterator_unique(InputIterator b, InputIterator e); + void insert_iterator_unique(InputIterator b, InputIterator e, char); // Inserts a value into the btree. template <typename ValueType> @@ -1163,18 +1332,8 @@ class btree { // to the element after the last erased element. std::pair<size_type, iterator> erase_range(iterator begin, iterator end); - // Erases the specified key from the btree. Returns 1 if an element was - // erased and 0 otherwise. - template <typename K> - size_type erase_unique(const K &key); - - // Erases all of the entries matching the specified key from the - // btree. Returns the number of elements erased. - template <typename K> - size_type erase_multi(const K &key); - - // Finds the iterator corresponding to a key or returns end() if the key is - // not present. + // Finds an element with key equivalent to `key` or returns `end()` if `key` + // is not present. template <typename K> iterator find(const K &key) { return internal_end(internal_find(key)); @@ -1184,38 +1343,23 @@ class btree { return internal_end(internal_find(key)); } - // Returns a count of the number of times the key appears in the btree. - template <typename K> - size_type count_unique(const K &key) const { - const iterator begin = internal_find(key); - if (begin.node == nullptr) { - // The key doesn't exist in the tree. - return 0; - } - return 1; - } - // Returns a count of the number of times the key appears in the btree. - template <typename K> - size_type count_multi(const K &key) const { - const auto range = equal_range(key); - return std::distance(range.first, range.second); - } - // Clear the btree, deleting all of the values it contains. void clear(); - // Swap the contents of *this and x. - void swap(btree &x); + // Swaps the contents of `this` and `other`. + void swap(btree &other); const key_compare &key_comp() const noexcept { return root_.template get<0>(); } - template <typename K, typename LK> - bool compare_keys(const K &x, const LK &y) const { - return compare_internal::compare_result_as_less_than(key_comp()(x, y)); + template <typename K1, typename K2> + bool compare_keys(const K1 &a, const K2 &b) const { + return compare_internal::compare_result_as_less_than(key_comp()(a, b)); } - value_compare value_comp() const { return value_compare(key_comp()); } + value_compare value_comp() const { + return value_compare(original_key_compare(key_comp())); + } // Verifies the structure of the btree. void verify() const; @@ -1263,12 +1407,14 @@ class btree { } } - // The average number of bytes used per value stored in the btree. + // The average number of bytes used per value stored in the btree assuming + // random insertion order. static double average_bytes_per_value() { - // Returns the number of bytes per value on a leaf node that is 75% - // full. Experimentally, this matches up nicely with the computed number of - // bytes per value in trees that had their values inserted in random order. - return node_type::LeafSize() / (kNodeValues * 0.75); + // The expected number of values per node with random insertion order is the + // average of the maximum and minimum numbers of values per node. + const double expected_values_per_node = + (kNodeSlots + kMinNodeValues) / 2.0; + return node_type::LeafSize() / expected_values_per_node; } // The fullness of the btree. Computed as the number of elements in the btree @@ -1278,7 +1424,7 @@ class btree { // Returns 0 for empty trees. double fullness() const { if (empty()) return 0.0; - return static_cast<double>(size()) / (nodes() * kNodeValues); + return static_cast<double>(size()) / (nodes() * kNodeSlots); } // The overhead of the btree structure in bytes per node. Computed as the // total number of bytes used by the btree minus the number of bytes used for @@ -1322,38 +1468,24 @@ class btree { // Node creation/deletion routines. node_type *new_internal_node(node_type *parent) { - node_type *p = allocate(node_type::InternalSize()); - return node_type::init_internal(p, parent); + node_type *n = allocate(node_type::InternalSize()); + n->init_internal(parent); + return n; } node_type *new_leaf_node(node_type *parent) { - node_type *p = allocate(node_type::LeafSize()); - return node_type::init_leaf(p, parent, kNodeValues); + node_type *n = allocate(node_type::LeafSize()); + n->init_leaf(parent, kNodeSlots); + return n; } node_type *new_leaf_root_node(const int max_count) { - node_type *p = allocate(node_type::LeafSize(max_count)); - return node_type::init_leaf(p, p, max_count); + node_type *n = allocate(node_type::LeafSize(max_count)); + n->init_leaf(/*parent=*/n, max_count); + return n; } // Deletion helper routines. - void erase_same_node(iterator begin, iterator end); - iterator erase_from_leaf_node(iterator begin, size_type to_erase); iterator rebalance_after_delete(iterator iter); - // Deallocates a node of a certain size in bytes using the allocator. - void deallocate(const size_type size, node_type *node) { - absl::container_internal::Deallocate<node_type::Alignment()>( - mutable_allocator(), node, size); - } - - void delete_internal_node(node_type *node) { - node->destroy(mutable_allocator()); - deallocate(node_type::InternalSize(), node); - } - void delete_leaf_node(node_type *node) { - node->destroy(mutable_allocator()); - deallocate(node_type::LeafSize(node->max_count()), node); - } - // Rebalances or splits the node iter points to. void rebalance_or_split(iterator *iter); @@ -1391,28 +1523,19 @@ class btree { static IterType internal_last(IterType iter); // Returns an iterator pointing to the leaf position at which key would - // reside in the tree. We provide 2 versions of internal_locate. The first - // version uses a less-than comparator and is incapable of distinguishing when - // there is an exact match. The second version is for the key-compare-to - // specialization and distinguishes exact matches. The key-compare-to - // specialization allows the caller to avoid a subsequent comparison to - // determine if an exact match was made, which is important for keys with - // expensive comparison, such as strings. + // reside in the tree, unless there is an exact match - in which case, the + // result may not be on a leaf. When there's a three-way comparator, we can + // return whether there was an exact match. This allows the caller to avoid a + // subsequent comparison to determine if an exact match was made, which is + // important for keys with expensive comparison, such as strings. template <typename K> SearchResult<iterator, is_key_compare_to::value> internal_locate( const K &key) const; - template <typename K> - SearchResult<iterator, false> internal_locate_impl( - const K &key, std::false_type /* IsCompareTo */) const; - - template <typename K> - SearchResult<iterator, true> internal_locate_impl( - const K &key, std::true_type /* IsCompareTo */) const; - // Internal routine which implements lower_bound(). template <typename K> - iterator internal_lower_bound(const K &key) const; + SearchResult<iterator, is_key_compare_to::value> internal_lower_bound( + const K &key) const; // Internal routine which implements upper_bound(). template <typename K> @@ -1422,9 +1545,6 @@ class btree { template <typename K> iterator internal_find(const K &key) const; - // Deletes a node and all of its children. - void internal_clear(node_type *node); - // Verifies the tree structure of node. int internal_verify(const node_type *node, const key_type *lo, const key_type *hi) const; @@ -1444,13 +1564,6 @@ class btree { return res; } - public: - // Exposed only for tests. - static bool testonly_uses_linear_node_search() { - return node_type::testonly_uses_linear_node_search(); - } - - private: // We use compressed tuple in order to save space because key_compare and // allocator_type are usually empty. absl::container_internal::CompressedTuple<key_compare, allocator_type, @@ -1477,10 +1590,8 @@ inline void btree_node<P>::emplace_value(const size_type i, // Shift old values to create space for new value and then construct it in // place. if (i < finish()) { - value_init(finish(), alloc, slot(finish() - 1)); - for (size_type j = finish() - 1; j > i; --j) - params_type::move(alloc, slot(j - 1), slot(j)); - value_destroy(i, alloc); + transfer_n_backward(finish() - i, /*dest_i=*/i + 1, /*src_i=*/i, this, + alloc); } value_init(i, alloc, std::forward<Args>(args)...); set_finish(finish() + 1); @@ -1494,24 +1605,27 @@ inline void btree_node<P>::emplace_value(const size_type i, } template <typename P> -inline void btree_node<P>::remove_value(const int i, allocator_type *alloc) { - if (!leaf() && finish() > i + 1) { - assert(child(i + 1)->count() == 0); - for (size_type j = i + 1; j < finish(); ++j) { - set_child(j, child(j + 1)); +inline void btree_node<P>::remove_values(const field_type i, + const field_type to_erase, + allocator_type *alloc) { + // Transfer values after the removed range into their new places. + value_destroy_n(i, to_erase, alloc); + const field_type orig_finish = finish(); + const field_type src_i = i + to_erase; + transfer_n(orig_finish - src_i, i, src_i, this, alloc); + + if (!leaf()) { + // Delete all children between begin and end. + for (int j = 0; j < to_erase; ++j) { + clear_and_delete(child(i + j + 1), alloc); + } + // Rotate children after end into new positions. + for (int j = i + to_erase + 1; j <= orig_finish; ++j) { + set_child(j - to_erase, child(j)); + clear_child(j); } - clear_child(finish()); } - - remove_values_ignore_children(i, /*to_erase=*/1, alloc); -} - -template <typename P> -inline void btree_node<P>::remove_values_ignore_children( - const int i, const int to_erase, allocator_type *alloc) { - params_type::move(alloc, slot(i + to_erase), finish_slot(), slot(i)); - value_destroy_n(finish() - to_erase, to_erase, alloc); - set_finish(finish() - to_erase); + set_finish(orig_finish - to_erase); } template <typename P> @@ -1525,22 +1639,17 @@ void btree_node<P>::rebalance_right_to_left(const int to_move, assert(to_move <= right->count()); // 1) Move the delimiting value in the parent to the left node. - value_init(finish(), alloc, parent()->slot(position())); + transfer(finish(), position(), parent(), alloc); // 2) Move the (to_move - 1) values from the right node to the left node. - right->uninitialized_move_n(to_move - 1, right->start(), finish() + 1, this, - alloc); + transfer_n(to_move - 1, finish() + 1, right->start(), right, alloc); // 3) Move the new delimiting value to the parent from the right node. - params_type::move(alloc, right->slot(to_move - 1), - parent()->slot(position())); + parent()->transfer(position(), right->start() + to_move - 1, right, alloc); - // 4) Shift the values in the right node to their correct position. - params_type::move(alloc, right->slot(to_move), right->finish_slot(), - right->start_slot()); - - // 5) Destroy the now-empty to_move entries in the right node. - right->value_destroy_n(right->finish() - to_move, to_move, alloc); + // 4) Shift the values in the right node to their correct positions. + right->transfer_n(right->count() - to_move, right->start(), + right->start() + to_move, right, alloc); if (!leaf()) { // Move the child pointers from the right to the left node. @@ -1575,54 +1684,19 @@ void btree_node<P>::rebalance_left_to_right(const int to_move, // Lastly, a new delimiting value is moved from the left node into the // parent, and the remaining empty left node entries are destroyed. - if (right->count() >= to_move) { - // The original location of the right->count() values are sufficient to hold - // the new to_move entries from the parent and left node. - - // 1) Shift existing values in the right node to their correct positions. - right->uninitialized_move_n(to_move, right->finish() - to_move, - right->finish(), right, alloc); - for (slot_type *src = right->slot(right->finish() - to_move - 1), - *dest = right->slot(right->finish() - 1), - *end = right->start_slot(); - src >= end; --src, --dest) { - params_type::move(alloc, src, dest); - } - - // 2) Move the delimiting value in the parent to the right node. - params_type::move(alloc, parent()->slot(position()), - right->slot(to_move - 1)); - - // 3) Move the (to_move - 1) values from the left node to the right node. - params_type::move(alloc, slot(finish() - (to_move - 1)), finish_slot(), - right->start_slot()); - } else { - // The right node does not have enough initialized space to hold the new - // to_move entries, so part of them will move to uninitialized space. + // 1) Shift existing values in the right node to their correct positions. + right->transfer_n_backward(right->count(), right->start() + to_move, + right->start(), right, alloc); - // 1) Shift existing values in the right node to their correct positions. - right->uninitialized_move_n(right->count(), right->start(), - right->start() + to_move, right, alloc); + // 2) Move the delimiting value in the parent to the right node. + right->transfer(right->start() + to_move - 1, position(), parent(), alloc); - // 2) Move the delimiting value in the parent to the right node. - right->value_init(to_move - 1, alloc, parent()->slot(position())); - - // 3) Move the (to_move - 1) values from the left node to the right node. - const size_type uninitialized_remaining = to_move - right->count() - 1; - uninitialized_move_n(uninitialized_remaining, - finish() - uninitialized_remaining, right->finish(), - right, alloc); - params_type::move(alloc, slot(finish() - (to_move - 1)), - slot(finish() - uninitialized_remaining), - right->start_slot()); - } + // 3) Move the (to_move - 1) values from the left node to the right node. + right->transfer_n(to_move - 1, right->start(), finish() - (to_move - 1), this, + alloc); // 4) Move the new delimiting value to the parent from the left node. - params_type::move(alloc, slot(finish() - to_move), - parent()->slot(position())); - - // 5) Destroy the now-empty to_move entries in the left node. - value_destroy_n(finish() - to_move, to_move, alloc); + parent()->transfer(position(), finish() - to_move, this, alloc); if (!leaf()) { // Move the child pointers from the left to the right node. @@ -1645,7 +1719,7 @@ template <typename P> void btree_node<P>::split(const int insert_position, btree_node *dest, allocator_type *alloc) { assert(dest->count() == 0); - assert(max_count() == kNodeValues); + assert(max_count() == kNodeSlots); // We bias the split based on the position being inserted. If we're // inserting at the beginning of the left node then bias the split to put @@ -1653,7 +1727,7 @@ void btree_node<P>::split(const int insert_position, btree_node *dest, // right node then bias the split to put more values on the left node. if (insert_position == start()) { dest->set_finish(dest->start() + finish() - 1); - } else if (insert_position == kNodeValues) { + } else if (insert_position == kNodeSlots) { dest->set_finish(dest->start()); } else { dest->set_finish(dest->start() + count() / 2); @@ -1662,10 +1736,7 @@ void btree_node<P>::split(const int insert_position, btree_node *dest, assert(count() >= 1); // Move values from the left sibling to the right sibling. - uninitialized_move_n(dest->count(), finish(), dest->start(), dest, alloc); - - // Destroy the now-empty entries in the left node. - value_destroy_n(finish(), dest->count(), alloc); + dest->transfer_n(dest->count(), dest->start(), finish(), this, alloc); // The split key is the largest value in the left sibling. --mutable_finish(); @@ -1692,11 +1763,7 @@ void btree_node<P>::merge(btree_node *src, allocator_type *alloc) { value_init(finish(), alloc, parent()->slot(position())); // Move the values from the right to the left node. - src->uninitialized_move_n(src->count(), src->start(), finish() + 1, this, - alloc); - - // Destroy the now-empty entries in the right node. - src->value_destroy_n(src->start(), src->count(), alloc); + transfer_n(src->count(), finish() + 1, src->start(), src, alloc); if (!leaf()) { // Move the child pointers from the right to the left node. @@ -1710,56 +1777,59 @@ void btree_node<P>::merge(btree_node *src, allocator_type *alloc) { set_finish(start() + 1 + count() + src->count()); src->set_finish(src->start()); - // Remove the value on the parent node. - parent()->remove_value(position(), alloc); + // Remove the value on the parent node and delete the src node. + parent()->remove_values(position(), /*to_erase=*/1, alloc); } template <typename P> -void btree_node<P>::swap(btree_node *x, allocator_type *alloc) { - using std::swap; - assert(leaf() == x->leaf()); - - // Determine which is the smaller/larger node. - btree_node *smaller = this, *larger = x; - if (smaller->count() > larger->count()) { - swap(smaller, larger); +void btree_node<P>::clear_and_delete(btree_node *node, allocator_type *alloc) { + if (node->leaf()) { + node->value_destroy_n(node->start(), node->count(), alloc); + deallocate(LeafSize(node->max_count()), node, alloc); + return; } - - // Swap the values. - for (slot_type *a = smaller->start_slot(), *b = larger->start_slot(), - *end = smaller->finish_slot(); - a != end; ++a, ++b) { - params_type::swap(alloc, a, b); + if (node->count() == 0) { + deallocate(InternalSize(), node, alloc); + return; } - // Move values that can't be swapped. - const size_type to_move = larger->count() - smaller->count(); - larger->uninitialized_move_n(to_move, smaller->finish(), smaller->finish(), - smaller, alloc); - larger->value_destroy_n(smaller->finish(), to_move, alloc); + // The parent of the root of the subtree we are deleting. + btree_node *delete_root_parent = node->parent(); - if (!leaf()) { - // Swap the child pointers. - std::swap_ranges(&smaller->mutable_child(smaller->start()), - &smaller->mutable_child(smaller->finish() + 1), - &larger->mutable_child(larger->start())); - // Update swapped children's parent pointers. - int i = smaller->start(); - int j = larger->start(); - for (; i <= smaller->finish(); ++i, ++j) { - smaller->child(i)->set_parent(smaller); - larger->child(j)->set_parent(larger); - } - // Move the child pointers that couldn't be swapped. - for (; j <= larger->finish(); ++i, ++j) { - smaller->init_child(i, larger->child(j)); - larger->clear_child(j); - } + // Navigate to the leftmost leaf under node, and then delete upwards. + while (!node->leaf()) node = node->start_child(); + // Use `int` because `pos` needs to be able to hold `kNodeSlots+1`, which + // isn't guaranteed to be a valid `field_type`. + int pos = node->position(); + btree_node *parent = node->parent(); + for (;;) { + // In each iteration of the next loop, we delete one leaf node and go right. + assert(pos <= parent->finish()); + do { + node = parent->child(pos); + if (!node->leaf()) { + // Navigate to the leftmost leaf under node. + while (!node->leaf()) node = node->start_child(); + pos = node->position(); + parent = node->parent(); + } + node->value_destroy_n(node->start(), node->count(), alloc); + deallocate(LeafSize(node->max_count()), node, alloc); + ++pos; + } while (pos <= parent->finish()); + + // Once we've deleted all children of parent, delete parent and go up/right. + assert(pos > parent->finish()); + do { + node = parent; + pos = node->position(); + parent = node->parent(); + node->value_destroy_n(node->start(), node->count(), alloc); + deallocate(InternalSize(), node, alloc); + if (parent == delete_root_parent) return; + ++pos; + } while (pos > parent->finish()); } - - // Swap the `finish`s. - // TODO(ezb): with floating storage, will also need to swap starts. - swap(mutable_finish(), x->mutable_finish()); } //// @@ -1774,6 +1844,7 @@ void btree_iterator<N, R, P>::increment_slow() { position = node->position(); node = node->parent(); } + // TODO(ezb): assert we aren't incrementing end() instead of handling. if (position == node->finish()) { *this = save; } @@ -1797,6 +1868,7 @@ void btree_iterator<N, R, P>::decrement_slow() { position = node->position() - 1; node = node->parent(); } + // TODO(ezb): assert we aren't decrementing begin() instead of handling. if (position < node->start()) { *this = save; } @@ -1814,7 +1886,7 @@ void btree_iterator<N, R, P>::decrement_slow() { // btree methods template <typename P> template <typename Btree> -void btree<P>::copy_or_move_values_in_order(Btree *x) { +void btree<P>::copy_or_move_values_in_order(Btree &other) { static_assert(std::is_same<btree, Btree>::value || std::is_same<const btree, Btree>::value, "Btree type must be same or const."); @@ -1822,11 +1894,11 @@ void btree<P>::copy_or_move_values_in_order(Btree *x) { // We can avoid key comparisons because we know the order of the // values is the same order we'll store them in. - auto iter = x->begin(); - if (iter == x->end()) return; + auto iter = other.begin(); + if (iter == other.end()) return; insert_multi(maybe_move_from_iterator(iter)); ++iter; - for (; iter != x->end(); ++iter) { + for (; iter != other.end(); ++iter) { // If the btree is not empty, we can just insert the new value at the end // of the tree. internal_emplace(end(), maybe_move_from_iterator(iter)); @@ -1845,7 +1917,7 @@ constexpr bool btree<P>::static_assert_validation() { // Note: We assert that kTargetValues, which is computed from // Params::kTargetNodeSize, must fit the node_type::field_type. static_assert( - kNodeValues < (1 << (8 * sizeof(typename node_type::field_type))), + kNodeSlots < (1 << (8 * sizeof(typename node_type::field_type))), "target node size too large"); // Verify that key_compare returns an absl::{weak,strong}_ordering or bool. @@ -1865,24 +1937,57 @@ constexpr bool btree<P>::static_assert_validation() { } template <typename P> -btree<P>::btree(const key_compare &comp, const allocator_type &alloc) - : root_(comp, alloc, EmptyNode()), rightmost_(EmptyNode()), size_(0) {} +template <typename K> +auto btree<P>::lower_bound_equal(const K &key) const + -> std::pair<iterator, bool> { + const SearchResult<iterator, is_key_compare_to::value> res = + internal_lower_bound(key); + const iterator lower = iterator(internal_end(res.value)); + const bool equal = res.HasMatch() + ? res.IsEq() + : lower != end() && !compare_keys(key, lower.key()); + return {lower, equal}; +} template <typename P> -btree<P>::btree(const btree &x) : btree(x.key_comp(), x.allocator()) { - copy_or_move_values_in_order(&x); +template <typename K> +auto btree<P>::equal_range(const K &key) -> std::pair<iterator, iterator> { + const std::pair<iterator, bool> lower_and_equal = lower_bound_equal(key); + const iterator lower = lower_and_equal.first; + if (!lower_and_equal.second) { + return {lower, lower}; + } + + const iterator next = std::next(lower); + if (!params_type::template can_have_multiple_equivalent_keys<K>()) { + // The next iterator after lower must point to a key greater than `key`. + // Note: if this assert fails, then it may indicate that the comparator does + // not meet the equivalence requirements for Compare + // (see https://en.cppreference.com/w/cpp/named_req/Compare). + assert(next == end() || compare_keys(key, next.key())); + return {lower, next}; + } + // Try once more to avoid the call to upper_bound() if there's only one + // equivalent key. This should prevent all calls to upper_bound() in cases of + // unique-containers with heterogeneous comparators in which all comparison + // operators have the same equivalence classes. + if (next == end() || compare_keys(key, next.key())) return {lower, next}; + + // In this case, we need to call upper_bound() to avoid worst case O(N) + // behavior if we were to iterate over equal keys. + return {lower, upper_bound(key)}; } template <typename P> -template <typename... Args> -auto btree<P>::insert_unique(const key_type &key, Args &&... args) +template <typename K, typename... Args> +auto btree<P>::insert_unique(const K &key, Args &&... args) -> std::pair<iterator, bool> { if (empty()) { mutable_root() = rightmost_ = new_leaf_root_node(1); } - auto res = internal_locate(key); - iterator &iter = res.value; + SearchResult<iterator, is_key_compare_to::value> res = internal_locate(key); + iterator iter = res.value; if (res.HasMatch()) { if (res.IsEq()) { @@ -1900,8 +2005,8 @@ auto btree<P>::insert_unique(const key_type &key, Args &&... args) } template <typename P> -template <typename... Args> -inline auto btree<P>::insert_hint_unique(iterator position, const key_type &key, +template <typename K, typename... Args> +inline auto btree<P>::insert_hint_unique(iterator position, const K &key, Args &&... args) -> std::pair<iterator, bool> { if (!empty()) { @@ -1925,14 +2030,23 @@ inline auto btree<P>::insert_hint_unique(iterator position, const key_type &key, } template <typename P> -template <typename InputIterator> -void btree<P>::insert_iterator_unique(InputIterator b, InputIterator e) { +template <typename InputIterator, typename> +void btree<P>::insert_iterator_unique(InputIterator b, InputIterator e, int) { for (; b != e; ++b) { insert_hint_unique(end(), params_type::key(*b), *b); } } template <typename P> +template <typename InputIterator> +void btree<P>::insert_iterator_unique(InputIterator b, InputIterator e, char) { + for (; b != e; ++b) { + init_type value(*b); + insert_hint_unique(end(), params_type::key(value), std::move(value)); + } +} + +template <typename P> template <typename ValueType> auto btree<P>::insert_multi(const key_type &key, ValueType &&v) -> iterator { if (empty()) { @@ -1977,46 +2091,47 @@ void btree<P>::insert_iterator_multi(InputIterator b, InputIterator e) { } template <typename P> -auto btree<P>::operator=(const btree &x) -> btree & { - if (this != &x) { +auto btree<P>::operator=(const btree &other) -> btree & { + if (this != &other) { clear(); - *mutable_key_comp() = x.key_comp(); + *mutable_key_comp() = other.key_comp(); if (absl::allocator_traits< allocator_type>::propagate_on_container_copy_assignment::value) { - *mutable_allocator() = x.allocator(); + *mutable_allocator() = other.allocator(); } - copy_or_move_values_in_order(&x); + copy_or_move_values_in_order(other); } return *this; } template <typename P> -auto btree<P>::operator=(btree &&x) noexcept -> btree & { - if (this != &x) { +auto btree<P>::operator=(btree &&other) noexcept -> btree & { + if (this != &other) { clear(); using std::swap; if (absl::allocator_traits< allocator_type>::propagate_on_container_copy_assignment::value) { // Note: `root_` also contains the allocator and the key comparator. - swap(root_, x.root_); - swap(rightmost_, x.rightmost_); - swap(size_, x.size_); + swap(root_, other.root_); + swap(rightmost_, other.rightmost_); + swap(size_, other.size_); } else { - if (allocator() == x.allocator()) { - swap(mutable_root(), x.mutable_root()); - swap(*mutable_key_comp(), *x.mutable_key_comp()); - swap(rightmost_, x.rightmost_); - swap(size_, x.size_); + if (allocator() == other.allocator()) { + swap(mutable_root(), other.mutable_root()); + swap(*mutable_key_comp(), *other.mutable_key_comp()); + swap(rightmost_, other.rightmost_); + swap(size_, other.size_); } else { // We aren't allowed to propagate the allocator and the allocator is // different so we can't take over its memory. We must move each element - // individually. We need both `x` and `this` to have `x`s key comparator - // while moving the values so we can't swap the key comparators. - *mutable_key_comp() = x.key_comp(); - copy_or_move_values_in_order(&x); + // individually. We need both `other` and `this` to have `other`s key + // comparator while moving the values so we can't swap the key + // comparators. + *mutable_key_comp() = other.key_comp(); + copy_or_move_values_in_order(other); } } } @@ -2028,7 +2143,7 @@ auto btree<P>::erase(iterator iter) -> iterator { bool internal_delete = false; if (!iter.node->leaf()) { // Deletion of a value on an internal node. First, move the largest value - // from our left child here, then delete that position (in remove_value() + // from our left child here, then delete that position (in remove_values() // below). We can get to the largest value from our left child by // decrementing iter. iterator internal_iter(iter); @@ -2040,7 +2155,7 @@ auto btree<P>::erase(iterator iter) -> iterator { } // Delete the key from the leaf. - iter.node->remove_value(iter.position, mutable_allocator()); + iter.node->remove_values(iter.position, /*to_erase=*/1, mutable_allocator()); --size_; // We want to return the next value after the one we just erased. If we @@ -2115,7 +2230,9 @@ auto btree<P>::erase_range(iterator begin, iterator end) } if (begin.node == end.node) { - erase_same_node(begin, end); + assert(end.position > begin.position); + begin.node->remove_values(begin.position, end.position - begin.position, + mutable_allocator()); size_ -= count; return {count, rebalance_after_delete(begin)}; } @@ -2125,8 +2242,11 @@ auto btree<P>::erase_range(iterator begin, iterator end) if (begin.node->leaf()) { const size_type remaining_to_erase = size_ - target_size; const size_type remaining_in_node = begin.node->finish() - begin.position; - begin = erase_from_leaf_node( - begin, (std::min)(remaining_to_erase, remaining_in_node)); + const size_type to_erase = + (std::min)(remaining_to_erase, remaining_in_node); + begin.node->remove_values(begin.position, to_erase, mutable_allocator()); + size_ -= to_erase; + begin = rebalance_after_delete(begin); } else { begin = erase(begin); } @@ -2135,79 +2255,9 @@ auto btree<P>::erase_range(iterator begin, iterator end) } template <typename P> -void btree<P>::erase_same_node(iterator begin, iterator end) { - assert(begin.node == end.node); - assert(end.position > begin.position); - - node_type *node = begin.node; - size_type to_erase = end.position - begin.position; - if (!node->leaf()) { - // Delete all children between begin and end. - for (size_type i = 0; i < to_erase; ++i) { - internal_clear(node->child(begin.position + i + 1)); - } - // Rotate children after end into new positions. - for (size_type i = begin.position + to_erase + 1; i <= node->finish(); - ++i) { - node->set_child(i - to_erase, node->child(i)); - node->clear_child(i); - } - } - node->remove_values_ignore_children(begin.position, to_erase, - mutable_allocator()); - - // Do not need to update rightmost_, because - // * either end == this->end(), and therefore node == rightmost_, and still - // exists - // * or end != this->end(), and therefore rightmost_ hasn't been erased, since - // it wasn't covered in [begin, end) -} - -template <typename P> -auto btree<P>::erase_from_leaf_node(iterator begin, size_type to_erase) - -> iterator { - node_type *node = begin.node; - assert(node->leaf()); - assert(node->finish() > begin.position); - assert(begin.position + to_erase <= node->finish()); - - node->remove_values_ignore_children(begin.position, to_erase, - mutable_allocator()); - - size_ -= to_erase; - - return rebalance_after_delete(begin); -} - -template <typename P> -template <typename K> -auto btree<P>::erase_unique(const K &key) -> size_type { - const iterator iter = internal_find(key); - if (iter.node == nullptr) { - // The key doesn't exist in the tree, return nothing done. - return 0; - } - erase(iter); - return 1; -} - -template <typename P> -template <typename K> -auto btree<P>::erase_multi(const K &key) -> size_type { - const iterator begin = internal_lower_bound(key); - if (begin.node == nullptr) { - // The key doesn't exist in the tree, return nothing done. - return 0; - } - // Delete all of the keys between begin and upper_bound(key). - const iterator end = internal_end(internal_upper_bound(key)); - return erase_range(begin, end).first; -} - -template <typename P> void btree<P>::clear() { if (!empty()) { - internal_clear(root()); + node_type::clear_and_delete(root(), mutable_allocator()); } mutable_root() = EmptyNode(); rightmost_ = EmptyNode(); @@ -2215,20 +2265,20 @@ void btree<P>::clear() { } template <typename P> -void btree<P>::swap(btree &x) { +void btree<P>::swap(btree &other) { using std::swap; if (absl::allocator_traits< allocator_type>::propagate_on_container_swap::value) { // Note: `root_` also contains the allocator and the key comparator. - swap(root_, x.root_); + swap(root_, other.root_); } else { // It's undefined behavior if the allocators are unequal here. - assert(allocator() == x.allocator()); - swap(mutable_root(), x.mutable_root()); - swap(*mutable_key_comp(), *x.mutable_key_comp()); + assert(allocator() == other.allocator()); + swap(mutable_root(), other.mutable_root()); + swap(*mutable_key_comp(), *other.mutable_key_comp()); } - swap(rightmost_, x.rightmost_); - swap(size_, x.size_); + swap(rightmost_, other.rightmost_); + swap(size_, other.size_); } template <typename P> @@ -2248,7 +2298,7 @@ void btree<P>::rebalance_or_split(iterator *iter) { node_type *&node = iter->node; int &insert_position = iter->position; assert(node->count() == node->max_count()); - assert(kNodeValues == node->max_count()); + assert(kNodeSlots == node->max_count()); // First try to make room on the node by rebalancing. node_type *parent = node->parent(); @@ -2256,17 +2306,17 @@ void btree<P>::rebalance_or_split(iterator *iter) { if (node->position() > parent->start()) { // Try rebalancing with our left sibling. node_type *left = parent->child(node->position() - 1); - assert(left->max_count() == kNodeValues); - if (left->count() < kNodeValues) { + assert(left->max_count() == kNodeSlots); + if (left->count() < kNodeSlots) { // We bias rebalancing based on the position being inserted. If we're // inserting at the end of the right node then we bias rebalancing to // fill up the left node. - int to_move = (kNodeValues - left->count()) / - (1 + (insert_position < kNodeValues)); + int to_move = (kNodeSlots - left->count()) / + (1 + (insert_position < static_cast<int>(kNodeSlots))); to_move = (std::max)(1, to_move); if (insert_position - to_move >= node->start() || - left->count() + to_move < kNodeValues) { + left->count() + to_move < static_cast<int>(kNodeSlots)) { left->rebalance_right_to_left(to_move, node, mutable_allocator()); assert(node->max_count() - node->count() == to_move); @@ -2285,17 +2335,17 @@ void btree<P>::rebalance_or_split(iterator *iter) { if (node->position() < parent->finish()) { // Try rebalancing with our right sibling. node_type *right = parent->child(node->position() + 1); - assert(right->max_count() == kNodeValues); - if (right->count() < kNodeValues) { + assert(right->max_count() == kNodeSlots); + if (right->count() < kNodeSlots) { // We bias rebalancing based on the position being inserted. If we're // inserting at the beginning of the left node then we bias rebalancing // to fill up the right node. - int to_move = (kNodeValues - right->count()) / + int to_move = (static_cast<int>(kNodeSlots) - right->count()) / (1 + (insert_position > node->start())); to_move = (std::max)(1, to_move); if (insert_position <= node->finish() - to_move || - right->count() + to_move < kNodeValues) { + right->count() + to_move < static_cast<int>(kNodeSlots)) { node->rebalance_left_to_right(to_move, right, mutable_allocator()); if (insert_position > node->finish()) { @@ -2311,8 +2361,8 @@ void btree<P>::rebalance_or_split(iterator *iter) { // Rebalancing failed, make sure there is room on the parent node for a new // value. - assert(parent->max_count() == kNodeValues); - if (parent->count() == kNodeValues) { + assert(parent->max_count() == kNodeSlots); + if (parent->count() == kNodeSlots) { iterator parent_iter(node->parent(), node->position()); rebalance_or_split(&parent_iter); } @@ -2348,12 +2398,7 @@ void btree<P>::rebalance_or_split(iterator *iter) { template <typename P> void btree<P>::merge_nodes(node_type *left, node_type *right) { left->merge(right, mutable_allocator()); - if (right->leaf()) { - if (rightmost_ == right) rightmost_ = left; - delete_leaf_node(right); - } else { - delete_internal_node(right); - } + if (rightmost_ == right) rightmost_ = left; } template <typename P> @@ -2362,8 +2407,8 @@ bool btree<P>::try_merge_or_rebalance(iterator *iter) { if (iter->node->position() > parent->start()) { // Try merging with our left sibling. node_type *left = parent->child(iter->node->position() - 1); - assert(left->max_count() == kNodeValues); - if (1 + left->count() + iter->node->count() <= kNodeValues) { + assert(left->max_count() == kNodeSlots); + if (1U + left->count() + iter->node->count() <= kNodeSlots) { iter->position += 1 + left->count(); merge_nodes(left, iter->node); iter->node = left; @@ -2373,8 +2418,8 @@ bool btree<P>::try_merge_or_rebalance(iterator *iter) { if (iter->node->position() < parent->finish()) { // Try merging with our right sibling. node_type *right = parent->child(iter->node->position() + 1); - assert(right->max_count() == kNodeValues); - if (1 + iter->node->count() + right->count() <= kNodeValues) { + assert(right->max_count() == kNodeSlots); + if (1U + iter->node->count() + right->count() <= kNodeSlots) { merge_nodes(iter->node, right); return true; } @@ -2410,21 +2455,20 @@ bool btree<P>::try_merge_or_rebalance(iterator *iter) { template <typename P> void btree<P>::try_shrink() { - if (root()->count() > 0) { + node_type *orig_root = root(); + if (orig_root->count() > 0) { return; } // Deleted the last item on the root node, shrink the height of the tree. - if (root()->leaf()) { + if (orig_root->leaf()) { assert(size() == 0); - delete_leaf_node(root()); - mutable_root() = EmptyNode(); - rightmost_ = EmptyNode(); + mutable_root() = rightmost_ = EmptyNode(); } else { - node_type *child = root()->start_child(); + node_type *child = orig_root->start_child(); child->make_root(); - delete_internal_node(root()); mutable_root() = child; } + node_type::clear_and_delete(orig_root, mutable_allocator()); } template <typename P> @@ -2452,25 +2496,30 @@ inline auto btree<P>::internal_emplace(iterator iter, Args &&... args) --iter; ++iter.position; } - const int max_count = iter.node->max_count(); + const field_type max_count = iter.node->max_count(); + allocator_type *alloc = mutable_allocator(); if (iter.node->count() == max_count) { // Make room in the leaf for the new item. - if (max_count < kNodeValues) { + if (max_count < kNodeSlots) { // Insertion into the root where the root is smaller than the full node // size. Simply grow the size of the root node. assert(iter.node == root()); iter.node = - new_leaf_root_node((std::min<int>)(kNodeValues, 2 * max_count)); - iter.node->swap(root(), mutable_allocator()); - delete_leaf_node(root()); - mutable_root() = iter.node; - rightmost_ = iter.node; + new_leaf_root_node((std::min<int>)(kNodeSlots, 2 * max_count)); + // Transfer the values from the old root to the new root. + node_type *old_root = root(); + node_type *new_root = iter.node; + new_root->transfer_n(old_root->count(), new_root->start(), + old_root->start(), old_root, alloc); + new_root->set_finish(old_root->finish()); + old_root->set_finish(old_root->start()); + node_type::clear_and_delete(old_root, alloc); + mutable_root() = rightmost_ = new_root; } else { rebalance_or_split(&iter); } } - iter.node->emplace_value(iter.position, mutable_allocator(), - std::forward<Args>(args)...); + iter.node->emplace_value(iter.position, alloc, std::forward<Args>(args)...); ++size_; return iter; } @@ -2479,61 +2528,51 @@ template <typename P> template <typename K> inline auto btree<P>::internal_locate(const K &key) const -> SearchResult<iterator, is_key_compare_to::value> { - return internal_locate_impl(key, is_key_compare_to()); -} - -template <typename P> -template <typename K> -inline auto btree<P>::internal_locate_impl( - const K &key, std::false_type /* IsCompareTo */) const - -> SearchResult<iterator, false> { - iterator iter(const_cast<node_type *>(root())); - for (;;) { - iter.position = iter.node->lower_bound(key, key_comp()).value; - // NOTE: we don't need to walk all the way down the tree if the keys are - // equal, but determining equality would require doing an extra comparison - // on each node on the way down, and we will need to go all the way to the - // leaf node in the expected case. - if (iter.node->leaf()) { - break; - } - iter.node = iter.node->child(iter.position); - } - return {iter}; -} - -template <typename P> -template <typename K> -inline auto btree<P>::internal_locate_impl( - const K &key, std::true_type /* IsCompareTo */) const - -> SearchResult<iterator, true> { iterator iter(const_cast<node_type *>(root())); for (;;) { - SearchResult<int, true> res = iter.node->lower_bound(key, key_comp()); + SearchResult<int, is_key_compare_to::value> res = + iter.node->lower_bound(key, key_comp()); iter.position = res.value; - if (res.match == MatchKind::kEq) { + if (res.IsEq()) { return {iter, MatchKind::kEq}; } + // Note: in the non-key-compare-to case, we don't need to walk all the way + // down the tree if the keys are equal, but determining equality would + // require doing an extra comparison on each node on the way down, and we + // will need to go all the way to the leaf node in the expected case. if (iter.node->leaf()) { break; } iter.node = iter.node->child(iter.position); } + // Note: in the non-key-compare-to case, the key may actually be equivalent + // here (and the MatchKind::kNe is ignored). return {iter, MatchKind::kNe}; } template <typename P> template <typename K> -auto btree<P>::internal_lower_bound(const K &key) const -> iterator { +auto btree<P>::internal_lower_bound(const K &key) const + -> SearchResult<iterator, is_key_compare_to::value> { + if (!params_type::template can_have_multiple_equivalent_keys<K>()) { + SearchResult<iterator, is_key_compare_to::value> ret = internal_locate(key); + ret.value = internal_last(ret.value); + return ret; + } iterator iter(const_cast<node_type *>(root())); + SearchResult<int, is_key_compare_to::value> res; + bool seen_eq = false; for (;;) { - iter.position = iter.node->lower_bound(key, key_comp()).value; + res = iter.node->lower_bound(key, key_comp()); + iter.position = res.value; if (iter.node->leaf()) { break; } + seen_eq = seen_eq || res.IsEq(); iter.node = iter.node->child(iter.position); } - return internal_last(iter); + if (res.IsEq()) return {iter, MatchKind::kEq}; + return {internal_last(iter), seen_eq ? MatchKind::kEq : MatchKind::kNe}; } template <typename P> @@ -2553,7 +2592,7 @@ auto btree<P>::internal_upper_bound(const K &key) const -> iterator { template <typename P> template <typename K> auto btree<P>::internal_find(const K &key) const -> iterator { - auto res = internal_locate(key); + SearchResult<iterator, is_key_compare_to::value> res = internal_locate(key); if (res.HasMatch()) { if (res.IsEq()) { return res.value; @@ -2568,18 +2607,6 @@ auto btree<P>::internal_find(const K &key) const -> iterator { } template <typename P> -void btree<P>::internal_clear(node_type *node) { - if (!node->leaf()) { - for (int i = node->start(); i <= node->finish(); ++i) { - internal_clear(node->child(i)); - } - delete_internal_node(node); - } else { - delete_leaf_node(node); - } -} - -template <typename P> int btree<P>::internal_verify(const node_type *node, const key_type *lo, const key_type *hi) const { assert(node->count() > 0); diff --git a/third_party/abseil-cpp/absl/container/internal/btree_container.h b/third_party/abseil-cpp/absl/container/internal/btree_container.h index f2e4c3a535..a99668c713 100644 --- a/third_party/abseil-cpp/absl/container/internal/btree_container.h +++ b/third_party/abseil-cpp/absl/container/internal/btree_container.h @@ -20,9 +20,11 @@ #include <iterator> #include <utility> +#include "absl/base/attributes.h" #include "absl/base/internal/throw_delegate.h" #include "absl/container/internal/btree.h" // IWYU pragma: export #include "absl/container/internal/common.h" +#include "absl/memory/memory.h" #include "absl/meta/type_traits.h" namespace absl { @@ -50,7 +52,7 @@ class btree_container { using value_type = typename Tree::value_type; using size_type = typename Tree::size_type; using difference_type = typename Tree::difference_type; - using key_compare = typename Tree::key_compare; + using key_compare = typename Tree::original_key_compare; using value_compare = typename Tree::value_compare; using allocator_type = typename Tree::allocator_type; using reference = typename Tree::reference; @@ -68,10 +70,23 @@ class btree_container { explicit btree_container(const key_compare &comp, const allocator_type &alloc = allocator_type()) : tree_(comp, alloc) {} - btree_container(const btree_container &x) = default; - btree_container(btree_container &&x) noexcept = default; - btree_container &operator=(const btree_container &x) = default; - btree_container &operator=(btree_container &&x) noexcept( + explicit btree_container(const allocator_type &alloc) + : tree_(key_compare(), alloc) {} + + btree_container(const btree_container &other) + : btree_container(other, absl::allocator_traits<allocator_type>:: + select_on_container_copy_construction( + other.get_allocator())) {} + btree_container(const btree_container &other, const allocator_type &alloc) + : tree_(other.tree_, alloc) {} + + btree_container(btree_container &&other) noexcept( + std::is_nothrow_move_constructible<Tree>::value) = default; + btree_container(btree_container &&other, const allocator_type &alloc) + : tree_(std::move(other.tree_), alloc) {} + + btree_container &operator=(const btree_container &other) = default; + btree_container &operator=(btree_container &&other) noexcept( std::is_nothrow_move_assignable<Tree>::value) = default; // Iterator routines. @@ -90,6 +105,11 @@ class btree_container { // Lookup routines. template <typename K = key_type> + size_type count(const key_arg<K> &key) const { + auto equal_range = this->equal_range(key); + return std::distance(equal_range.first, equal_range.second); + } + template <typename K = key_type> iterator find(const key_arg<K> &key) { return tree_.find(key); } @@ -138,6 +158,11 @@ class btree_container { iterator erase(const_iterator first, const_iterator last) { return tree_.erase_range(iterator(first), iterator(last)).second; } + template <typename K = key_type> + size_type erase(const key_arg<K> &key) { + auto equal_range = this->equal_range(key); + return tree_.erase_range(equal_range.first, equal_range.second).first; + } // Extract routines. node_type extract(iterator position) { @@ -151,10 +176,9 @@ class btree_container { return extract(iterator(position)); } - public: // Utility routines. - void clear() { tree_.clear(); } - void swap(btree_container &x) { tree_.swap(x.tree_); } + ABSL_ATTRIBUTE_REINITIALIZES void clear() { tree_.clear(); } + void swap(btree_container &other) { tree_.swap(other.tree_); } void verify() const { tree_.verify(); } // Size routines. @@ -191,7 +215,7 @@ class btree_container { allocator_type get_allocator() const { return tree_.get_allocator(); } // The key comparator used by the btree. - key_compare key_comp() const { return tree_.key_comp(); } + key_compare key_comp() const { return key_compare(tree_.key_comp()); } value_compare value_comp() const { return tree_.value_comp(); } // Support absl::Hash. @@ -224,7 +248,7 @@ class btree_set_container : public btree_container<Tree> { using key_type = typename Tree::key_type; using value_type = typename Tree::value_type; using size_type = typename Tree::size_type; - using key_compare = typename Tree::key_compare; + using key_compare = typename Tree::original_key_compare; using allocator_type = typename Tree::allocator_type; using iterator = typename Tree::iterator; using const_iterator = typename Tree::const_iterator; @@ -235,7 +259,7 @@ class btree_set_container : public btree_container<Tree> { using super_type::super_type; btree_set_container() {} - // Range constructor. + // Range constructors. template <class InputIterator> btree_set_container(InputIterator b, InputIterator e, const key_compare &comp = key_compare(), @@ -243,56 +267,55 @@ class btree_set_container : public btree_container<Tree> { : super_type(comp, alloc) { insert(b, e); } + template <class InputIterator> + btree_set_container(InputIterator b, InputIterator e, + const allocator_type &alloc) + : btree_set_container(b, e, key_compare(), alloc) {} - // Initializer list constructor. + // Initializer list constructors. btree_set_container(std::initializer_list<init_type> init, const key_compare &comp = key_compare(), const allocator_type &alloc = allocator_type()) : btree_set_container(init.begin(), init.end(), comp, alloc) {} - - // Lookup routines. - template <typename K = key_type> - size_type count(const key_arg<K> &key) const { - return this->tree_.count_unique(key); - } + btree_set_container(std::initializer_list<init_type> init, + const allocator_type &alloc) + : btree_set_container(init.begin(), init.end(), alloc) {} // Insertion routines. - std::pair<iterator, bool> insert(const value_type &x) { - return this->tree_.insert_unique(params_type::key(x), x); + std::pair<iterator, bool> insert(const value_type &v) { + return this->tree_.insert_unique(params_type::key(v), v); } - std::pair<iterator, bool> insert(value_type &&x) { - return this->tree_.insert_unique(params_type::key(x), std::move(x)); + std::pair<iterator, bool> insert(value_type &&v) { + return this->tree_.insert_unique(params_type::key(v), std::move(v)); } template <typename... Args> std::pair<iterator, bool> emplace(Args &&... args) { init_type v(std::forward<Args>(args)...); return this->tree_.insert_unique(params_type::key(v), std::move(v)); } - iterator insert(const_iterator position, const value_type &x) { + iterator insert(const_iterator hint, const value_type &v) { return this->tree_ - .insert_hint_unique(iterator(position), params_type::key(x), x) + .insert_hint_unique(iterator(hint), params_type::key(v), v) .first; } - iterator insert(const_iterator position, value_type &&x) { + iterator insert(const_iterator hint, value_type &&v) { return this->tree_ - .insert_hint_unique(iterator(position), params_type::key(x), - std::move(x)) + .insert_hint_unique(iterator(hint), params_type::key(v), std::move(v)) .first; } template <typename... Args> - iterator emplace_hint(const_iterator position, Args &&... args) { + iterator emplace_hint(const_iterator hint, Args &&... args) { init_type v(std::forward<Args>(args)...); return this->tree_ - .insert_hint_unique(iterator(position), params_type::key(v), - std::move(v)) + .insert_hint_unique(iterator(hint), params_type::key(v), std::move(v)) .first; } template <typename InputIterator> void insert(InputIterator b, InputIterator e) { - this->tree_.insert_iterator_unique(b, e); + this->tree_.insert_iterator_unique(b, e, 0); } void insert(std::initializer_list<init_type> init) { - this->tree_.insert_iterator_unique(init.begin(), init.end()); + this->tree_.insert_iterator_unique(init.begin(), init.end(), 0); } insert_return_type insert(node_type &&node) { if (!node) return {this->end(), false, node_type()}; @@ -315,18 +338,13 @@ class btree_set_container : public btree_container<Tree> { return res.first; } - // Deletion routines. - template <typename K = key_type> - size_type erase(const key_arg<K> &key) { - return this->tree_.erase_unique(key); - } - using super_type::erase; - // Node extraction routines. template <typename K = key_type> node_type extract(const key_arg<K> &key) { - auto it = this->find(key); - return it == this->end() ? node_type() : extract(it); + const std::pair<iterator, bool> lower_and_equal = + this->tree_.lower_bound_equal(key); + return lower_and_equal.second ? extract(lower_and_equal.first) + : node_type(); } using super_type::extract; @@ -344,7 +362,7 @@ class btree_set_container : public btree_container<Tree> { int> = 0> void merge(btree_container<T> &src) { // NOLINT for (auto src_it = src.begin(); src_it != src.end();) { - if (insert(std::move(*src_it)).second) { + if (insert(std::move(params_type::element(src_it.slot()))).second) { src_it = src.erase(src_it); } else { ++src_it; @@ -371,6 +389,7 @@ template <typename Tree> class btree_map_container : public btree_set_container<Tree> { using super_type = btree_set_container<Tree>; using params_type = typename Tree::params_type; + friend class BtreeNodePeer; private: template <class K> @@ -380,7 +399,7 @@ class btree_map_container : public btree_set_container<Tree> { using key_type = typename Tree::key_type; using mapped_type = typename params_type::mapped_type; using value_type = typename Tree::value_type; - using key_compare = typename Tree::key_compare; + using key_compare = typename Tree::original_key_compare; using allocator_type = typename Tree::allocator_type; using iterator = typename Tree::iterator; using const_iterator = typename Tree::const_iterator; @@ -392,111 +411,72 @@ class btree_map_container : public btree_set_container<Tree> { // Insertion routines. // Note: the nullptr template arguments and extra `const M&` overloads allow // for supporting bitfield arguments. - // Note: when we call `std::forward<M>(obj)` twice, it's safe because - // insert_unique/insert_hint_unique are guaranteed to not consume `obj` when - // `ret.second` is false. - template <class M> - std::pair<iterator, bool> insert_or_assign(const key_type &k, const M &obj) { - const std::pair<iterator, bool> ret = this->tree_.insert_unique(k, k, obj); - if (!ret.second) ret.first->second = obj; - return ret; + template <typename K = key_type, class M> + std::pair<iterator, bool> insert_or_assign(const key_arg<K> &k, + const M &obj) { + return insert_or_assign_impl(k, obj); } - template <class M, key_type * = nullptr> - std::pair<iterator, bool> insert_or_assign(key_type &&k, const M &obj) { - const std::pair<iterator, bool> ret = - this->tree_.insert_unique(k, std::move(k), obj); - if (!ret.second) ret.first->second = obj; - return ret; + template <typename K = key_type, class M, K * = nullptr> + std::pair<iterator, bool> insert_or_assign(key_arg<K> &&k, const M &obj) { + return insert_or_assign_impl(std::forward<K>(k), obj); } - template <class M, M * = nullptr> - std::pair<iterator, bool> insert_or_assign(const key_type &k, M &&obj) { - const std::pair<iterator, bool> ret = - this->tree_.insert_unique(k, k, std::forward<M>(obj)); - if (!ret.second) ret.first->second = std::forward<M>(obj); - return ret; + template <typename K = key_type, class M, M * = nullptr> + std::pair<iterator, bool> insert_or_assign(const key_arg<K> &k, M &&obj) { + return insert_or_assign_impl(k, std::forward<M>(obj)); } - template <class M, key_type * = nullptr, M * = nullptr> - std::pair<iterator, bool> insert_or_assign(key_type &&k, M &&obj) { - const std::pair<iterator, bool> ret = - this->tree_.insert_unique(k, std::move(k), std::forward<M>(obj)); - if (!ret.second) ret.first->second = std::forward<M>(obj); - return ret; + template <typename K = key_type, class M, K * = nullptr, M * = nullptr> + std::pair<iterator, bool> insert_or_assign(key_arg<K> &&k, M &&obj) { + return insert_or_assign_impl(std::forward<K>(k), std::forward<M>(obj)); } - template <class M> - iterator insert_or_assign(const_iterator position, const key_type &k, + template <typename K = key_type, class M> + iterator insert_or_assign(const_iterator hint, const key_arg<K> &k, const M &obj) { - const std::pair<iterator, bool> ret = - this->tree_.insert_hint_unique(iterator(position), k, k, obj); - if (!ret.second) ret.first->second = obj; - return ret.first; + return insert_or_assign_hint_impl(hint, k, obj); } - template <class M, key_type * = nullptr> - iterator insert_or_assign(const_iterator position, key_type &&k, - const M &obj) { - const std::pair<iterator, bool> ret = this->tree_.insert_hint_unique( - iterator(position), k, std::move(k), obj); - if (!ret.second) ret.first->second = obj; - return ret.first; + template <typename K = key_type, class M, K * = nullptr> + iterator insert_or_assign(const_iterator hint, key_arg<K> &&k, const M &obj) { + return insert_or_assign_hint_impl(hint, std::forward<K>(k), obj); } - template <class M, M * = nullptr> - iterator insert_or_assign(const_iterator position, const key_type &k, - M &&obj) { - const std::pair<iterator, bool> ret = this->tree_.insert_hint_unique( - iterator(position), k, k, std::forward<M>(obj)); - if (!ret.second) ret.first->second = std::forward<M>(obj); - return ret.first; + template <typename K = key_type, class M, M * = nullptr> + iterator insert_or_assign(const_iterator hint, const key_arg<K> &k, M &&obj) { + return insert_or_assign_hint_impl(hint, k, std::forward<M>(obj)); } - template <class M, key_type * = nullptr, M * = nullptr> - iterator insert_or_assign(const_iterator position, key_type &&k, M &&obj) { - const std::pair<iterator, bool> ret = this->tree_.insert_hint_unique( - iterator(position), k, std::move(k), std::forward<M>(obj)); - if (!ret.second) ret.first->second = std::forward<M>(obj); - return ret.first; + template <typename K = key_type, class M, K * = nullptr, M * = nullptr> + iterator insert_or_assign(const_iterator hint, key_arg<K> &&k, M &&obj) { + return insert_or_assign_hint_impl(hint, std::forward<K>(k), + std::forward<M>(obj)); } - template <typename... Args> - std::pair<iterator, bool> try_emplace(const key_type &k, Args &&... args) { - return this->tree_.insert_unique( - k, std::piecewise_construct, std::forward_as_tuple(k), - std::forward_as_tuple(std::forward<Args>(args)...)); + + template <typename K = key_type, typename... Args, + typename absl::enable_if_t< + !std::is_convertible<K, const_iterator>::value, int> = 0> + std::pair<iterator, bool> try_emplace(const key_arg<K> &k, Args &&... args) { + return try_emplace_impl(k, std::forward<Args>(args)...); } - template <typename... Args> - std::pair<iterator, bool> try_emplace(key_type &&k, Args &&... args) { - // Note: `key_ref` exists to avoid a ClangTidy warning about moving from `k` - // and then using `k` unsequenced. This is safe because the move is into a - // forwarding reference and insert_unique guarantees that `key` is never - // referenced after consuming `args`. - const key_type &key_ref = k; - return this->tree_.insert_unique( - key_ref, std::piecewise_construct, std::forward_as_tuple(std::move(k)), - std::forward_as_tuple(std::forward<Args>(args)...)); + template <typename K = key_type, typename... Args, + typename absl::enable_if_t< + !std::is_convertible<K, const_iterator>::value, int> = 0> + std::pair<iterator, bool> try_emplace(key_arg<K> &&k, Args &&... args) { + return try_emplace_impl(std::forward<K>(k), std::forward<Args>(args)...); } - template <typename... Args> - iterator try_emplace(const_iterator hint, const key_type &k, + template <typename K = key_type, typename... Args> + iterator try_emplace(const_iterator hint, const key_arg<K> &k, Args &&... args) { - return this->tree_ - .insert_hint_unique(iterator(hint), k, std::piecewise_construct, - std::forward_as_tuple(k), - std::forward_as_tuple(std::forward<Args>(args)...)) - .first; + return try_emplace_hint_impl(hint, k, std::forward<Args>(args)...); } - template <typename... Args> - iterator try_emplace(const_iterator hint, key_type &&k, Args &&... args) { - // Note: `key_ref` exists to avoid a ClangTidy warning about moving from `k` - // and then using `k` unsequenced. This is safe because the move is into a - // forwarding reference and insert_hint_unique guarantees that `key` is - // never referenced after consuming `args`. - const key_type &key_ref = k; - return this->tree_ - .insert_hint_unique(iterator(hint), key_ref, std::piecewise_construct, - std::forward_as_tuple(std::move(k)), - std::forward_as_tuple(std::forward<Args>(args)...)) - .first; + template <typename K = key_type, typename... Args> + iterator try_emplace(const_iterator hint, key_arg<K> &&k, Args &&... args) { + return try_emplace_hint_impl(hint, std::forward<K>(k), + std::forward<Args>(args)...); } - mapped_type &operator[](const key_type &k) { + + template <typename K = key_type> + mapped_type &operator[](const key_arg<K> &k) { return try_emplace(k).first->second; } - mapped_type &operator[](key_type &&k) { - return try_emplace(std::move(k)).first->second; + template <typename K = key_type> + mapped_type &operator[](key_arg<K> &&k) { + return try_emplace(std::forward<K>(k)).first->second; } template <typename K = key_type> @@ -513,6 +493,40 @@ class btree_map_container : public btree_set_container<Tree> { base_internal::ThrowStdOutOfRange("absl::btree_map::at"); return it->second; } + + private: + // Note: when we call `std::forward<M>(obj)` twice, it's safe because + // insert_unique/insert_hint_unique are guaranteed to not consume `obj` when + // `ret.second` is false. + template <class K, class M> + std::pair<iterator, bool> insert_or_assign_impl(K &&k, M &&obj) { + const std::pair<iterator, bool> ret = + this->tree_.insert_unique(k, std::forward<K>(k), std::forward<M>(obj)); + if (!ret.second) ret.first->second = std::forward<M>(obj); + return ret; + } + template <class K, class M> + iterator insert_or_assign_hint_impl(const_iterator hint, K &&k, M &&obj) { + const std::pair<iterator, bool> ret = this->tree_.insert_hint_unique( + iterator(hint), k, std::forward<K>(k), std::forward<M>(obj)); + if (!ret.second) ret.first->second = std::forward<M>(obj); + return ret.first; + } + + template <class K, class... Args> + std::pair<iterator, bool> try_emplace_impl(K &&k, Args &&... args) { + return this->tree_.insert_unique( + k, std::piecewise_construct, std::forward_as_tuple(std::forward<K>(k)), + std::forward_as_tuple(std::forward<Args>(args)...)); + } + template <class K, class... Args> + iterator try_emplace_hint_impl(const_iterator hint, K &&k, Args &&... args) { + return this->tree_ + .insert_hint_unique(iterator(hint), k, std::piecewise_construct, + std::forward_as_tuple(std::forward<K>(k)), + std::forward_as_tuple(std::forward<Args>(args)...)) + .first; + } }; // A common base class for btree_multiset and btree_multimap. @@ -530,7 +544,7 @@ class btree_multiset_container : public btree_container<Tree> { using key_type = typename Tree::key_type; using value_type = typename Tree::value_type; using size_type = typename Tree::size_type; - using key_compare = typename Tree::key_compare; + using key_compare = typename Tree::original_key_compare; using allocator_type = typename Tree::allocator_type; using iterator = typename Tree::iterator; using const_iterator = typename Tree::const_iterator; @@ -540,7 +554,7 @@ class btree_multiset_container : public btree_container<Tree> { using super_type::super_type; btree_multiset_container() {} - // Range constructor. + // Range constructors. template <class InputIterator> btree_multiset_container(InputIterator b, InputIterator e, const key_compare &comp = key_compare(), @@ -548,29 +562,30 @@ class btree_multiset_container : public btree_container<Tree> { : super_type(comp, alloc) { insert(b, e); } + template <class InputIterator> + btree_multiset_container(InputIterator b, InputIterator e, + const allocator_type &alloc) + : btree_multiset_container(b, e, key_compare(), alloc) {} - // Initializer list constructor. + // Initializer list constructors. btree_multiset_container(std::initializer_list<init_type> init, const key_compare &comp = key_compare(), const allocator_type &alloc = allocator_type()) : btree_multiset_container(init.begin(), init.end(), comp, alloc) {} - - // Lookup routines. - template <typename K = key_type> - size_type count(const key_arg<K> &key) const { - return this->tree_.count_multi(key); - } + btree_multiset_container(std::initializer_list<init_type> init, + const allocator_type &alloc) + : btree_multiset_container(init.begin(), init.end(), alloc) {} // Insertion routines. - iterator insert(const value_type &x) { return this->tree_.insert_multi(x); } - iterator insert(value_type &&x) { - return this->tree_.insert_multi(std::move(x)); + iterator insert(const value_type &v) { return this->tree_.insert_multi(v); } + iterator insert(value_type &&v) { + return this->tree_.insert_multi(std::move(v)); } - iterator insert(const_iterator position, const value_type &x) { - return this->tree_.insert_hint_multi(iterator(position), x); + iterator insert(const_iterator hint, const value_type &v) { + return this->tree_.insert_hint_multi(iterator(hint), v); } - iterator insert(const_iterator position, value_type &&x) { - return this->tree_.insert_hint_multi(iterator(position), std::move(x)); + iterator insert(const_iterator hint, value_type &&v) { + return this->tree_.insert_hint_multi(iterator(hint), std::move(v)); } template <typename InputIterator> void insert(InputIterator b, InputIterator e) { @@ -584,9 +599,9 @@ class btree_multiset_container : public btree_container<Tree> { return this->tree_.insert_multi(init_type(std::forward<Args>(args)...)); } template <typename... Args> - iterator emplace_hint(const_iterator position, Args &&... args) { + iterator emplace_hint(const_iterator hint, Args &&... args) { return this->tree_.insert_hint_multi( - iterator(position), init_type(std::forward<Args>(args)...)); + iterator(hint), init_type(std::forward<Args>(args)...)); } iterator insert(node_type &&node) { if (!node) return this->end(); @@ -605,18 +620,13 @@ class btree_multiset_container : public btree_container<Tree> { return res; } - // Deletion routines. - template <typename K = key_type> - size_type erase(const key_arg<K> &key) { - return this->tree_.erase_multi(key); - } - using super_type::erase; - // Node extraction routines. template <typename K = key_type> node_type extract(const key_arg<K> &key) { - auto it = this->find(key); - return it == this->end() ? node_type() : extract(it); + const std::pair<iterator, bool> lower_and_equal = + this->tree_.lower_bound_equal(key); + return lower_and_equal.second ? extract(lower_and_equal.first) + : node_type(); } using super_type::extract; @@ -632,8 +642,9 @@ class btree_multiset_container : public btree_container<Tree> { typename T::params_type::is_map_container>>::value, int> = 0> void merge(btree_container<T> &src) { // NOLINT - insert(std::make_move_iterator(src.begin()), - std::make_move_iterator(src.end())); + for (auto src_it = src.begin(), end = src.end(); src_it != end; ++src_it) { + insert(std::move(params_type::element(src_it.slot()))); + } src.clear(); } diff --git a/third_party/abseil-cpp/absl/container/internal/common.h b/third_party/abseil-cpp/absl/container/internal/common.h index 5037d80316..030e9d4ab0 100644 --- a/third_party/abseil-cpp/absl/container/internal/common.h +++ b/third_party/abseil-cpp/absl/container/internal/common.h @@ -138,6 +138,7 @@ class node_handle<Policy, PolicyTraits, Alloc, absl::void_t<typename Policy::mapped_type>> : public node_handle_base<PolicyTraits, Alloc> { using Base = node_handle_base<PolicyTraits, Alloc>; + using slot_type = typename PolicyTraits::slot_type; public: using key_type = typename Policy::key_type; @@ -145,8 +146,11 @@ class node_handle<Policy, PolicyTraits, Alloc, constexpr node_handle() {} - auto key() const -> decltype(PolicyTraits::key(this->slot())) { - return PolicyTraits::key(this->slot()); + // When C++17 is available, we can use std::launder to provide mutable + // access to the key. Otherwise, we provide const access. + auto key() const + -> decltype(PolicyTraits::mutable_key(std::declval<slot_type*>())) { + return PolicyTraits::mutable_key(this->slot()); } mapped_type& mapped() const { diff --git a/third_party/abseil-cpp/absl/container/internal/compressed_tuple.h b/third_party/abseil-cpp/absl/container/internal/compressed_tuple.h index 4bfe92fd99..5ebe164942 100644 --- a/third_party/abseil-cpp/absl/container/internal/compressed_tuple.h +++ b/third_party/abseil-cpp/absl/container/internal/compressed_tuple.h @@ -169,9 +169,33 @@ constexpr bool ShouldAnyUseBase() { } template <typename T, typename V> -using TupleMoveConstructible = typename std::conditional< - std::is_reference<T>::value, std::is_convertible<V, T>, - std::is_constructible<T, V&&>>::type; +using TupleElementMoveConstructible = + typename std::conditional<std::is_reference<T>::value, + std::is_convertible<V, T>, + std::is_constructible<T, V&&>>::type; + +template <bool SizeMatches, class T, class... Vs> +struct TupleMoveConstructible : std::false_type {}; + +template <class... Ts, class... Vs> +struct TupleMoveConstructible<true, CompressedTuple<Ts...>, Vs...> + : std::integral_constant< + bool, absl::conjunction< + TupleElementMoveConstructible<Ts, Vs&&>...>::value> {}; + +template <typename T> +struct compressed_tuple_size; + +template <typename... Es> +struct compressed_tuple_size<CompressedTuple<Es...>> + : public std::integral_constant<std::size_t, sizeof...(Es)> {}; + +template <class T, class... Vs> +struct TupleItemsMoveConstructible + : std::integral_constant< + bool, TupleMoveConstructible<compressed_tuple_size<T>::value == + sizeof...(Vs), + T, Vs...>::value> {}; } // namespace internal_compressed_tuple @@ -217,22 +241,23 @@ class ABSL_INTERNAL_COMPRESSED_TUPLE_DECLSPEC CompressedTuple explicit constexpr CompressedTuple(const Ts&... base) : CompressedTuple::CompressedTupleImpl(absl::in_place, base...) {} - template <typename... Vs, + template <typename First, typename... Vs, absl::enable_if_t< absl::conjunction< // Ensure we are not hiding default copy/move constructors. absl::negation<std::is_same<void(CompressedTuple), - void(absl::decay_t<Vs>...)>>, - internal_compressed_tuple::TupleMoveConstructible< - Ts, Vs&&>...>::value, + void(absl::decay_t<First>)>>, + internal_compressed_tuple::TupleItemsMoveConstructible< + CompressedTuple<Ts...>, First, Vs...>>::value, bool> = true> - explicit constexpr CompressedTuple(Vs&&... base) + explicit constexpr CompressedTuple(First&& first, Vs&&... base) : CompressedTuple::CompressedTupleImpl(absl::in_place, + absl::forward<First>(first), absl::forward<Vs>(base)...) {} template <int I> ElemT<I>& get() & { - return internal_compressed_tuple::Storage<ElemT<I>, I>::get(); + return StorageT<I>::get(); } template <int I> diff --git a/third_party/abseil-cpp/absl/container/internal/compressed_tuple_test.cc b/third_party/abseil-cpp/absl/container/internal/compressed_tuple_test.cc index 1dae12db81..62a7483ee3 100644 --- a/third_party/abseil-cpp/absl/container/internal/compressed_tuple_test.cc +++ b/third_party/abseil-cpp/absl/container/internal/compressed_tuple_test.cc @@ -277,11 +277,11 @@ TEST(CompressedTupleTest, Nested) { TEST(CompressedTupleTest, Reference) { int i = 7; - std::string s = "Very long std::string that goes in the heap"; + std::string s = "Very long string that goes in the heap"; CompressedTuple<int, int&, std::string, std::string&> x(i, i, s, s); // Sanity check. We should have not moved from `s` - EXPECT_EQ(s, "Very long std::string that goes in the heap"); + EXPECT_EQ(s, "Very long string that goes in the heap"); EXPECT_EQ(x.get<0>(), x.get<1>()); EXPECT_NE(&x.get<0>(), &x.get<1>()); diff --git a/third_party/abseil-cpp/absl/container/internal/container_memory.h b/third_party/abseil-cpp/absl/container/internal/container_memory.h index d24b0f8413..e67529ecb6 100644 --- a/third_party/abseil-cpp/absl/container/internal/container_memory.h +++ b/third_party/abseil-cpp/absl/container/internal/container_memory.h @@ -15,28 +15,34 @@ #ifndef ABSL_CONTAINER_INTERNAL_CONTAINER_MEMORY_H_ #define ABSL_CONTAINER_INTERNAL_CONTAINER_MEMORY_H_ -#ifdef ADDRESS_SANITIZER -#include <sanitizer/asan_interface.h> -#endif - -#ifdef MEMORY_SANITIZER -#include <sanitizer/msan_interface.h> -#endif - #include <cassert> #include <cstddef> #include <memory> +#include <new> #include <tuple> #include <type_traits> #include <utility> +#include "absl/base/config.h" #include "absl/memory/memory.h" +#include "absl/meta/type_traits.h" #include "absl/utility/utility.h" +#ifdef ABSL_HAVE_ADDRESS_SANITIZER +#include <sanitizer/asan_interface.h> +#endif + +#ifdef ABSL_HAVE_MEMORY_SANITIZER +#include <sanitizer/msan_interface.h> +#endif + namespace absl { ABSL_NAMESPACE_BEGIN namespace container_internal { +template <size_t Alignment> +struct alignas(Alignment) AlignedType {}; + // Allocates at least n bytes aligned to the specified alignment. // Alignment must be a power of 2. It must be positive. // @@ -48,11 +54,14 @@ template <size_t Alignment, class Alloc> void* Allocate(Alloc* alloc, size_t n) { static_assert(Alignment > 0, ""); assert(n && "n must be positive"); - struct alignas(Alignment) M {}; + using M = AlignedType<Alignment>; using A = typename absl::allocator_traits<Alloc>::template rebind_alloc<M>; using AT = typename absl::allocator_traits<Alloc>::template rebind_traits<M>; - A mem_alloc(*alloc); - void* p = AT::allocate(mem_alloc, (n + sizeof(M) - 1) / sizeof(M)); + // On macOS, "mem_alloc" is a #define with one argument defined in + // rpc/types.h, so we can't name the variable "mem_alloc" and initialize it + // with the "foo(bar)" syntax. + A my_mem_alloc(*alloc); + void* p = AT::allocate(my_mem_alloc, (n + sizeof(M) - 1) / sizeof(M)); assert(reinterpret_cast<uintptr_t>(p) % Alignment == 0 && "allocator does not respect alignment"); return p; @@ -64,11 +73,14 @@ template <size_t Alignment, class Alloc> void Deallocate(Alloc* alloc, void* p, size_t n) { static_assert(Alignment > 0, ""); assert(n && "n must be positive"); - struct alignas(Alignment) M {}; + using M = AlignedType<Alignment>; using A = typename absl::allocator_traits<Alloc>::template rebind_alloc<M>; using AT = typename absl::allocator_traits<Alloc>::template rebind_traits<M>; - A mem_alloc(*alloc); - AT::deallocate(mem_alloc, static_cast<M*>(p), + // On macOS, "mem_alloc" is a #define with one argument defined in + // rpc/types.h, so we can't name the variable "mem_alloc" and initialize it + // with the "foo(bar)" syntax. + A my_mem_alloc(*alloc); + AT::deallocate(my_mem_alloc, static_cast<M*>(p), (n + sizeof(M) - 1) / sizeof(M)); } @@ -205,10 +217,10 @@ DecomposeValue(F&& f, Arg&& arg) { // Helper functions for asan and msan. inline void SanitizerPoisonMemoryRegion(const void* m, size_t s) { -#ifdef ADDRESS_SANITIZER +#ifdef ABSL_HAVE_ADDRESS_SANITIZER ASAN_POISON_MEMORY_REGION(m, s); #endif -#ifdef MEMORY_SANITIZER +#ifdef ABSL_HAVE_MEMORY_SANITIZER __msan_poison(m, s); #endif (void)m; @@ -216,10 +228,10 @@ inline void SanitizerPoisonMemoryRegion(const void* m, size_t s) { } inline void SanitizerUnpoisonMemoryRegion(const void* m, size_t s) { -#ifdef ADDRESS_SANITIZER +#ifdef ABSL_HAVE_ADDRESS_SANITIZER ASAN_UNPOISON_MEMORY_REGION(m, s); #endif -#ifdef MEMORY_SANITIZER +#ifdef ABSL_HAVE_MEMORY_SANITIZER __msan_unpoison(m, s); #endif (void)m; @@ -246,8 +258,8 @@ namespace memory_internal { // type, which is non-portable. template <class Pair, class = std::true_type> struct OffsetOf { - static constexpr size_t kFirst = -1; - static constexpr size_t kSecond = -1; + static constexpr size_t kFirst = static_cast<size_t>(-1); + static constexpr size_t kSecond = static_cast<size_t>(-1); }; template <class Pair> @@ -316,11 +328,12 @@ union map_slot_type { map_slot_type() {} ~map_slot_type() = delete; using value_type = std::pair<const K, V>; - using mutable_value_type = std::pair<K, V>; + using mutable_value_type = + std::pair<absl::remove_const_t<K>, absl::remove_const_t<V>>; value_type value; mutable_value_type mutable_value; - K key; + absl::remove_const_t<K> key; }; template <class K, class V> @@ -346,6 +359,20 @@ struct map_slot_policy { return slot->value; } + // When C++17 is available, we can use std::launder to provide mutable + // access to the key for use in node handle. +#if defined(__cpp_lib_launder) && __cpp_lib_launder >= 201606 + static K& mutable_key(slot_type* slot) { + // Still check for kMutableKeys so that we can avoid calling std::launder + // unless necessary because it can interfere with optimizations. + return kMutableKeys::value ? slot->key + : *std::launder(const_cast<K*>( + std::addressof(slot->value.first))); + } +#else // !(defined(__cpp_lib_launder) && __cpp_lib_launder >= 201606) + static const K& mutable_key(slot_type* slot) { return key(slot); } +#endif + static const K& key(const slot_type* slot) { return kMutableKeys::value ? slot->key : slot->value.first; } @@ -424,13 +451,6 @@ struct map_slot_policy { std::move(src->value)); } } - - template <class Allocator> - static void move(Allocator* alloc, slot_type* first, slot_type* last, - slot_type* result) { - for (slot_type *src = first, *dest = result; src != last; ++src, ++dest) - move(alloc, src, dest); - } }; } // namespace container_internal diff --git a/third_party/abseil-cpp/absl/container/internal/container_memory_test.cc b/third_party/abseil-cpp/absl/container/internal/container_memory_test.cc index 7942c7be48..fb9c4ddede 100644 --- a/third_party/abseil-cpp/absl/container/internal/container_memory_test.cc +++ b/third_party/abseil-cpp/absl/container/internal/container_memory_test.cc @@ -16,10 +16,13 @@ #include <cstdint> #include <tuple> +#include <typeindex> +#include <typeinfo> #include <utility> #include "gmock/gmock.h" #include "gtest/gtest.h" +#include "absl/container/internal/test_instance_tracker.h" #include "absl/strings/string_view.h" namespace absl { @@ -27,6 +30,11 @@ ABSL_NAMESPACE_BEGIN namespace container_internal { namespace { +using ::absl::test_internal::CopyableMovableInstance; +using ::absl::test_internal::InstanceTracker; +using ::testing::_; +using ::testing::ElementsAre; +using ::testing::Gt; using ::testing::Pair; TEST(Memory, AlignmentLargerThanBase) { @@ -45,6 +53,39 @@ TEST(Memory, AlignmentSmallerThanBase) { Deallocate<2>(&alloc, mem, 3); } +std::map<std::type_index, int>& AllocationMap() { + static auto* map = new std::map<std::type_index, int>; + return *map; +} + +template <typename T> +struct TypeCountingAllocator { + TypeCountingAllocator() = default; + template <typename U> + TypeCountingAllocator(const TypeCountingAllocator<U>&) {} // NOLINT + + using value_type = T; + + T* allocate(size_t n, const void* = nullptr) { + AllocationMap()[typeid(T)] += n; + return std::allocator<T>().allocate(n); + } + void deallocate(T* p, std::size_t n) { + AllocationMap()[typeid(T)] -= n; + return std::allocator<T>().deallocate(p, n); + } +}; + +TEST(Memory, AllocateDeallocateMatchType) { + TypeCountingAllocator<int> alloc; + void* mem = Allocate<1>(&alloc, 1); + // Verify that it was allocated + EXPECT_THAT(AllocationMap(), ElementsAre(Pair(_, Gt(0)))); + Deallocate<1>(&alloc, mem, 1); + // Verify that the deallocation matched. + EXPECT_THAT(AllocationMap(), ElementsAre(Pair(_, 0))); +} + class Fixture : public ::testing::Test { using Alloc = std::allocator<std::string>; @@ -125,7 +166,7 @@ TryDecomposeValue(F&& f, Arg&& arg) { } TEST(DecomposeValue, Decomposable) { - auto f = [](const int& x, int&& y) { + auto f = [](const int& x, int&& y) { // NOLINT EXPECT_EQ(&x, &y); EXPECT_EQ(42, x); return 'A'; @@ -159,7 +200,8 @@ TryDecomposePair(F&& f, Args&&... args) { } TEST(DecomposePair, Decomposable) { - auto f = [](const int& x, std::piecewise_construct_t, std::tuple<int&&> k, + auto f = [](const int& x, // NOLINT + std::piecewise_construct_t, std::tuple<int&&> k, std::tuple<double>&& v) { EXPECT_EQ(&x, &std::get<0>(k)); EXPECT_EQ(42, x); @@ -184,6 +226,31 @@ TEST(DecomposePair, NotDecomposable) { std::make_tuple(0.5))); } +TEST(MapSlotPolicy, ConstKeyAndValue) { + using slot_policy = map_slot_policy<const CopyableMovableInstance, + const CopyableMovableInstance>; + using slot_type = typename slot_policy::slot_type; + + union Slots { + Slots() {} + ~Slots() {} + slot_type slots[100]; + } slots; + + std::allocator< + std::pair<const CopyableMovableInstance, const CopyableMovableInstance>> + alloc; + InstanceTracker tracker; + slot_policy::construct(&alloc, &slots.slots[0], CopyableMovableInstance(1), + CopyableMovableInstance(1)); + for (int i = 0; i < 99; ++i) { + slot_policy::transfer(&alloc, &slots.slots[i + 1], &slots.slots[i]); + } + slot_policy::destroy(&alloc, &slots.slots[99]); + + EXPECT_EQ(tracker.copies(), 0); +} + } // namespace } // namespace container_internal ABSL_NAMESPACE_END diff --git a/third_party/abseil-cpp/absl/container/internal/counting_allocator.h b/third_party/abseil-cpp/absl/container/internal/counting_allocator.h index 9efdc66213..927cf08255 100644 --- a/third_party/abseil-cpp/absl/container/internal/counting_allocator.h +++ b/third_party/abseil-cpp/absl/container/internal/counting_allocator.h @@ -15,7 +15,6 @@ #ifndef ABSL_CONTAINER_INTERNAL_COUNTING_ALLOCATOR_H_ #define ABSL_CONTAINER_INTERNAL_COUNTING_ALLOCATOR_H_ -#include <cassert> #include <cstdint> #include <memory> @@ -31,33 +30,63 @@ namespace container_internal { // containers - that chain of allocators uses the same state and is // thus easier to query for aggregate allocation information. template <typename T> -class CountingAllocator : public std::allocator<T> { +class CountingAllocator { public: - using Alloc = std::allocator<T>; - using pointer = typename Alloc::pointer; - using size_type = typename Alloc::size_type; + using Allocator = std::allocator<T>; + using AllocatorTraits = std::allocator_traits<Allocator>; + using value_type = typename AllocatorTraits::value_type; + using pointer = typename AllocatorTraits::pointer; + using const_pointer = typename AllocatorTraits::const_pointer; + using size_type = typename AllocatorTraits::size_type; + using difference_type = typename AllocatorTraits::difference_type; - CountingAllocator() : bytes_used_(nullptr) {} - explicit CountingAllocator(int64_t* b) : bytes_used_(b) {} + CountingAllocator() = default; + explicit CountingAllocator(int64_t* bytes_used) : bytes_used_(bytes_used) {} + CountingAllocator(int64_t* bytes_used, int64_t* instance_count) + : bytes_used_(bytes_used), instance_count_(instance_count) {} template <typename U> CountingAllocator(const CountingAllocator<U>& x) - : Alloc(x), bytes_used_(x.bytes_used_) {} + : bytes_used_(x.bytes_used_), instance_count_(x.instance_count_) {} - pointer allocate(size_type n, - std::allocator<void>::const_pointer hint = nullptr) { - assert(bytes_used_ != nullptr); - *bytes_used_ += n * sizeof(T); - return Alloc::allocate(n, hint); + pointer allocate( + size_type n, + typename AllocatorTraits::const_void_pointer hint = nullptr) { + Allocator allocator; + pointer ptr = AllocatorTraits::allocate(allocator, n, hint); + if (bytes_used_ != nullptr) { + *bytes_used_ += n * sizeof(T); + } + return ptr; } void deallocate(pointer p, size_type n) { - Alloc::deallocate(p, n); - assert(bytes_used_ != nullptr); - *bytes_used_ -= n * sizeof(T); + Allocator allocator; + AllocatorTraits::deallocate(allocator, p, n); + if (bytes_used_ != nullptr) { + *bytes_used_ -= n * sizeof(T); + } } - template<typename U> + template <typename U, typename... Args> + void construct(U* p, Args&&... args) { + Allocator allocator; + AllocatorTraits::construct(allocator, p, std::forward<Args>(args)...); + if (instance_count_ != nullptr) { + *instance_count_ += 1; + } + } + + template <typename U> + void destroy(U* p) { + Allocator allocator; + AllocatorTraits::destroy(allocator, p); + if (instance_count_ != nullptr) { + *instance_count_ -= 1; + } + } + + template <typename U> class rebind { public: using other = CountingAllocator<U>; @@ -65,7 +94,8 @@ class CountingAllocator : public std::allocator<T> { friend bool operator==(const CountingAllocator& a, const CountingAllocator& b) { - return a.bytes_used_ == b.bytes_used_; + return a.bytes_used_ == b.bytes_used_ && + a.instance_count_ == b.instance_count_; } friend bool operator!=(const CountingAllocator& a, @@ -73,7 +103,8 @@ class CountingAllocator : public std::allocator<T> { return !(a == b); } - int64_t* bytes_used_; + int64_t* bytes_used_ = nullptr; + int64_t* instance_count_ = nullptr; }; } // namespace container_internal diff --git a/third_party/abseil-cpp/absl/container/internal/hash_function_defaults.h b/third_party/abseil-cpp/absl/container/internal/hash_function_defaults.h index 401ddf4d83..250e662c9d 100644 --- a/third_party/abseil-cpp/absl/container/internal/hash_function_defaults.h +++ b/third_party/abseil-cpp/absl/container/internal/hash_function_defaults.h @@ -53,6 +53,7 @@ #include "absl/base/config.h" #include "absl/hash/hash.h" +#include "absl/strings/cord.h" #include "absl/strings/string_view.h" namespace absl { @@ -72,23 +73,39 @@ struct StringHash { size_t operator()(absl::string_view v) const { return absl::Hash<absl::string_view>{}(v); } + size_t operator()(const absl::Cord& v) const { + return absl::Hash<absl::Cord>{}(v); + } +}; + +struct StringEq { + using is_transparent = void; + bool operator()(absl::string_view lhs, absl::string_view rhs) const { + return lhs == rhs; + } + bool operator()(const absl::Cord& lhs, const absl::Cord& rhs) const { + return lhs == rhs; + } + bool operator()(const absl::Cord& lhs, absl::string_view rhs) const { + return lhs == rhs; + } + bool operator()(absl::string_view lhs, const absl::Cord& rhs) const { + return lhs == rhs; + } }; // Supports heterogeneous lookup for string-like elements. struct StringHashEq { using Hash = StringHash; - struct Eq { - using is_transparent = void; - bool operator()(absl::string_view lhs, absl::string_view rhs) const { - return lhs == rhs; - } - }; + using Eq = StringEq; }; template <> struct HashEq<std::string> : StringHashEq {}; template <> struct HashEq<absl::string_view> : StringHashEq {}; +template <> +struct HashEq<absl::Cord> : StringHashEq {}; // Supports heterogeneous lookup for pointers and smart pointers. template <class T> diff --git a/third_party/abseil-cpp/absl/container/internal/hash_function_defaults_test.cc b/third_party/abseil-cpp/absl/container/internal/hash_function_defaults_test.cc index 2eefc7e0de..59576b8ede 100644 --- a/third_party/abseil-cpp/absl/container/internal/hash_function_defaults_test.cc +++ b/third_party/abseil-cpp/absl/container/internal/hash_function_defaults_test.cc @@ -19,6 +19,9 @@ #include <utility> #include "gtest/gtest.h" +#include "absl/random/random.h" +#include "absl/strings/cord.h" +#include "absl/strings/cord_test_helpers.h" #include "absl/strings/string_view.h" namespace absl { @@ -203,10 +206,91 @@ TYPED_TEST(HashPointer, Works) { EXPECT_NE(hash(&dummy), hash(cuptr)); } +TEST(EqCord, Works) { + hash_default_eq<absl::Cord> eq; + const absl::string_view a_string_view = "a"; + const absl::Cord a_cord(a_string_view); + const absl::string_view b_string_view = "b"; + const absl::Cord b_cord(b_string_view); + + EXPECT_TRUE(eq(a_cord, a_cord)); + EXPECT_TRUE(eq(a_cord, a_string_view)); + EXPECT_TRUE(eq(a_string_view, a_cord)); + EXPECT_FALSE(eq(a_cord, b_cord)); + EXPECT_FALSE(eq(a_cord, b_string_view)); + EXPECT_FALSE(eq(b_string_view, a_cord)); +} + +TEST(HashCord, Works) { + hash_default_hash<absl::Cord> hash; + const absl::string_view a_string_view = "a"; + const absl::Cord a_cord(a_string_view); + const absl::string_view b_string_view = "b"; + const absl::Cord b_cord(b_string_view); + + EXPECT_EQ(hash(a_cord), hash(a_cord)); + EXPECT_EQ(hash(b_cord), hash(b_cord)); + EXPECT_EQ(hash(a_string_view), hash(a_cord)); + EXPECT_EQ(hash(b_string_view), hash(b_cord)); + EXPECT_EQ(hash(absl::Cord("")), hash("")); + EXPECT_EQ(hash(absl::Cord()), hash(absl::string_view())); + + EXPECT_NE(hash(a_cord), hash(b_cord)); + EXPECT_NE(hash(a_cord), hash(b_string_view)); + EXPECT_NE(hash(a_string_view), hash(b_cord)); + EXPECT_NE(hash(a_string_view), hash(b_string_view)); +} + +void NoOpReleaser(absl::string_view data, void* arg) {} + +TEST(HashCord, FragmentedCordWorks) { + hash_default_hash<absl::Cord> hash; + absl::Cord c = absl::MakeFragmentedCord({"a", "b", "c"}); + EXPECT_FALSE(c.TryFlat().has_value()); + EXPECT_EQ(hash(c), hash("abc")); +} + +TEST(HashCord, FragmentedLongCordWorks) { + hash_default_hash<absl::Cord> hash; + // Crete some large strings which do not fit on the stack. + std::string a(65536, 'a'); + std::string b(65536, 'b'); + absl::Cord c = absl::MakeFragmentedCord({a, b}); + EXPECT_FALSE(c.TryFlat().has_value()); + EXPECT_EQ(hash(c), hash(a + b)); +} + +TEST(HashCord, RandomCord) { + hash_default_hash<absl::Cord> hash; + auto bitgen = absl::BitGen(); + for (int i = 0; i < 1000; ++i) { + const int number_of_segments = absl::Uniform(bitgen, 0, 10); + std::vector<std::string> pieces; + for (size_t s = 0; s < number_of_segments; ++s) { + std::string str; + str.resize(absl::Uniform(bitgen, 0, 4096)); + // MSVC needed the explicit return type in the lambda. + std::generate(str.begin(), str.end(), [&]() -> char { + return static_cast<char>(absl::Uniform<unsigned char>(bitgen)); + }); + pieces.push_back(str); + } + absl::Cord c = absl::MakeFragmentedCord(pieces); + EXPECT_EQ(hash(c), hash(std::string(c))); + } +} + // Cartesian product of (std::string, absl::string_view) -// with (std::string, absl::string_view, const char*). +// with (std::string, absl::string_view, const char*, absl::Cord). using StringTypesCartesianProduct = Types< // clang-format off + std::pair<absl::Cord, std::string>, + std::pair<absl::Cord, absl::string_view>, + std::pair<absl::Cord, absl::Cord>, + std::pair<absl::Cord, const char*>, + + std::pair<std::string, absl::Cord>, + std::pair<absl::string_view, absl::Cord>, std::pair<absl::string_view, std::string>, std::pair<absl::string_view, absl::string_view>, @@ -253,11 +337,11 @@ ABSL_NAMESPACE_END } // namespace absl enum Hash : size_t { - kStd = 0x2, // std::hash + kStd = 0x1, // std::hash #ifdef _MSC_VER kExtension = kStd, // In MSVC, std::hash == ::hash #else // _MSC_VER - kExtension = 0x4, // ::hash (GCC extension) + kExtension = 0x2, // ::hash (GCC extension) #endif // _MSC_VER }; diff --git a/third_party/abseil-cpp/absl/container/internal/hash_generator_testing.cc b/third_party/abseil-cpp/absl/container/internal/hash_generator_testing.cc index 75c4db6c36..59cc5aac7a 100644 --- a/third_party/abseil-cpp/absl/container/internal/hash_generator_testing.cc +++ b/third_party/abseil-cpp/absl/container/internal/hash_generator_testing.cc @@ -41,8 +41,10 @@ class RandomDeviceSeedSeq { } // namespace std::mt19937_64* GetSharedRng() { - RandomDeviceSeedSeq seed_seq; - static auto* rng = new std::mt19937_64(seed_seq); + static auto* rng = [] { + RandomDeviceSeedSeq seed_seq; + return new std::mt19937_64(seed_seq); + }(); return rng; } diff --git a/third_party/abseil-cpp/absl/container/internal/hash_generator_testing.h b/third_party/abseil-cpp/absl/container/internal/hash_generator_testing.h index 6869fe45e8..f1f555a5c1 100644 --- a/third_party/abseil-cpp/absl/container/internal/hash_generator_testing.h +++ b/third_party/abseil-cpp/absl/container/internal/hash_generator_testing.h @@ -21,11 +21,13 @@ #include <stdint.h> #include <algorithm> +#include <cassert> #include <iosfwd> #include <random> #include <tuple> #include <type_traits> #include <utility> +#include <vector> #include "absl/container/internal/hash_policy_testing.h" #include "absl/memory/memory.h" @@ -153,6 +155,25 @@ using GeneratedType = decltype( typename Container::value_type, typename Container::key_type>::type>&>()()); +// Naive wrapper that performs a linear search of previous values. +// Beware this is O(SQR), which is reasonable for smaller kMaxValues. +template <class T, size_t kMaxValues = 64, class E = void> +struct UniqueGenerator { + Generator<T, E> gen; + std::vector<T> values; + + T operator()() { + assert(values.size() < kMaxValues); + for (;;) { + T value = gen(); + if (std::find(values.begin(), values.end(), value) == values.end()) { + values.push_back(value); + return value; + } + } + } +}; + } // namespace hash_internal } // namespace container_internal ABSL_NAMESPACE_END diff --git a/third_party/abseil-cpp/absl/container/internal/hash_policy_traits.h b/third_party/abseil-cpp/absl/container/internal/hash_policy_traits.h index 3e1209c6eb..46c97b18a2 100644 --- a/third_party/abseil-cpp/absl/container/internal/hash_policy_traits.h +++ b/third_party/abseil-cpp/absl/container/internal/hash_policy_traits.h @@ -17,6 +17,7 @@ #include <cstddef> #include <memory> +#include <new> #include <type_traits> #include <utility> @@ -29,15 +30,34 @@ namespace container_internal { // Defines how slots are initialized/destroyed/moved. template <class Policy, class = void> struct hash_policy_traits { + // The type of the keys stored in the hashtable. + using key_type = typename Policy::key_type; + private: struct ReturnKey { - // We return `Key` here. + // When C++17 is available, we can use std::launder to provide mutable + // access to the key for use in node handle. +#if defined(__cpp_lib_launder) && __cpp_lib_launder >= 201606 + template <class Key, + absl::enable_if_t<std::is_lvalue_reference<Key>::value, int> = 0> + static key_type& Impl(Key&& k, int) { + return *std::launder( + const_cast<key_type*>(std::addressof(std::forward<Key>(k)))); + } +#endif + + template <class Key> + static Key Impl(Key&& k, char) { + return std::forward<Key>(k); + } + // When Key=T&, we forward the lvalue reference. // When Key=T, we return by value to avoid a dangling reference. // eg, for string_hash_map. template <class Key, class... Args> - Key operator()(Key&& k, const Args&...) const { - return std::forward<Key>(k); + auto operator()(Key&& k, const Args&...) const + -> decltype(Impl(std::forward<Key>(k), 0)) { + return Impl(std::forward<Key>(k), 0); } }; @@ -52,9 +72,6 @@ struct hash_policy_traits { // The actual object stored in the hash table. using slot_type = typename Policy::slot_type; - // The type of the keys stored in the hashtable. - using key_type = typename Policy::key_type; - // The argument type for insertions into the hashtable. This is different // from value_type for increased performance. See initializer_list constructor // and insert() member functions for more details. @@ -156,7 +173,7 @@ struct hash_policy_traits { // Returns the "key" portion of the slot. // Used for node handle manipulation. template <class P = Policy> - static auto key(slot_type* slot) + static auto mutable_key(slot_type* slot) -> decltype(P::apply(ReturnKey(), element(slot))) { return P::apply(ReturnKey(), element(slot)); } diff --git a/third_party/abseil-cpp/absl/container/internal/hashtablez_sampler.cc b/third_party/abseil-cpp/absl/container/internal/hashtablez_sampler.cc index 5644725178..40cce0479e 100644 --- a/third_party/abseil-cpp/absl/container/internal/hashtablez_sampler.cc +++ b/third_party/abseil-cpp/absl/container/internal/hashtablez_sampler.cc @@ -21,10 +21,11 @@ #include <limits> #include "absl/base/attributes.h" -#include "absl/base/internal/exponential_biased.h" #include "absl/container/internal/have_sse.h" #include "absl/debugging/stacktrace.h" #include "absl/memory/memory.h" +#include "absl/profiling/internal/exponential_biased.h" +#include "absl/profiling/internal/sample_recorder.h" #include "absl/synchronization/mutex.h" namespace absl { @@ -37,10 +38,9 @@ ABSL_CONST_INIT std::atomic<bool> g_hashtablez_enabled{ false }; ABSL_CONST_INIT std::atomic<int32_t> g_hashtablez_sample_parameter{1 << 10}; -ABSL_CONST_INIT std::atomic<int32_t> g_hashtablez_max_samples{1 << 20}; #if defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE) -ABSL_PER_THREAD_TLS_KEYWORD absl::base_internal::ExponentialBiased +ABSL_PER_THREAD_TLS_KEYWORD absl::profiling_internal::ExponentialBiased g_exponential_biased_generator; #endif @@ -50,16 +50,14 @@ ABSL_PER_THREAD_TLS_KEYWORD absl::base_internal::ExponentialBiased ABSL_PER_THREAD_TLS_KEYWORD int64_t global_next_sample = 0; #endif // defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE) -HashtablezSampler& HashtablezSampler::Global() { +HashtablezSampler& GlobalHashtablezSampler() { static auto* sampler = new HashtablezSampler(); return *sampler; } -HashtablezSampler::DisposeCallback HashtablezSampler::SetDisposeCallback( - DisposeCallback f) { - return dispose_.exchange(f, std::memory_order_relaxed); -} - +// TODO(bradleybear): The comments at this constructors declaration say that the +// fields are not initialized, but this definition does initialize the fields. +// Something needs to be cleaned up. HashtablezInfo::HashtablezInfo() { PrepareForSampling(); } HashtablezInfo::~HashtablezInfo() = default; @@ -67,10 +65,13 @@ void HashtablezInfo::PrepareForSampling() { capacity.store(0, std::memory_order_relaxed); size.store(0, std::memory_order_relaxed); num_erases.store(0, std::memory_order_relaxed); + num_rehashes.store(0, std::memory_order_relaxed); max_probe_length.store(0, std::memory_order_relaxed); total_probe_length.store(0, std::memory_order_relaxed); hashes_bitwise_or.store(0, std::memory_order_relaxed); hashes_bitwise_and.store(~size_t{}, std::memory_order_relaxed); + hashes_bitwise_xor.store(0, std::memory_order_relaxed); + max_reserve.store(0, std::memory_order_relaxed); create_time = absl::Now(); // The inliner makes hardcoded skip_count difficult (especially when combined @@ -78,93 +79,6 @@ void HashtablezInfo::PrepareForSampling() { // instead. depth = absl::GetStackTrace(stack, HashtablezInfo::kMaxStackDepth, /* skip_count= */ 0); - dead = nullptr; -} - -HashtablezSampler::HashtablezSampler() - : dropped_samples_(0), size_estimate_(0), all_(nullptr), dispose_(nullptr) { - absl::MutexLock l(&graveyard_.init_mu); - graveyard_.dead = &graveyard_; -} - -HashtablezSampler::~HashtablezSampler() { - HashtablezInfo* s = all_.load(std::memory_order_acquire); - while (s != nullptr) { - HashtablezInfo* next = s->next; - delete s; - s = next; - } -} - -void HashtablezSampler::PushNew(HashtablezInfo* sample) { - sample->next = all_.load(std::memory_order_relaxed); - while (!all_.compare_exchange_weak(sample->next, sample, - std::memory_order_release, - std::memory_order_relaxed)) { - } -} - -void HashtablezSampler::PushDead(HashtablezInfo* sample) { - if (auto* dispose = dispose_.load(std::memory_order_relaxed)) { - dispose(*sample); - } - - absl::MutexLock graveyard_lock(&graveyard_.init_mu); - absl::MutexLock sample_lock(&sample->init_mu); - sample->dead = graveyard_.dead; - graveyard_.dead = sample; -} - -HashtablezInfo* HashtablezSampler::PopDead() { - absl::MutexLock graveyard_lock(&graveyard_.init_mu); - - // The list is circular, so eventually it collapses down to - // graveyard_.dead == &graveyard_ - // when it is empty. - HashtablezInfo* sample = graveyard_.dead; - if (sample == &graveyard_) return nullptr; - - absl::MutexLock sample_lock(&sample->init_mu); - graveyard_.dead = sample->dead; - sample->PrepareForSampling(); - return sample; -} - -HashtablezInfo* HashtablezSampler::Register() { - int64_t size = size_estimate_.fetch_add(1, std::memory_order_relaxed); - if (size > g_hashtablez_max_samples.load(std::memory_order_relaxed)) { - size_estimate_.fetch_sub(1, std::memory_order_relaxed); - dropped_samples_.fetch_add(1, std::memory_order_relaxed); - return nullptr; - } - - HashtablezInfo* sample = PopDead(); - if (sample == nullptr) { - // Resurrection failed. Hire a new warlock. - sample = new HashtablezInfo(); - PushNew(sample); - } - - return sample; -} - -void HashtablezSampler::Unregister(HashtablezInfo* sample) { - PushDead(sample); - size_estimate_.fetch_sub(1, std::memory_order_relaxed); -} - -int64_t HashtablezSampler::Iterate( - const std::function<void(const HashtablezInfo& stack)>& f) { - HashtablezInfo* s = all_.load(std::memory_order_acquire); - while (s != nullptr) { - absl::MutexLock l(&s->init_mu); - if (s->dead == nullptr) { - f(*s); - } - s = s->next; - } - - return dropped_samples_.load(std::memory_order_relaxed); } static bool ShouldForceSampling() { @@ -179,16 +93,20 @@ static bool ShouldForceSampling() { if (ABSL_PREDICT_TRUE(state == kDontForce)) return false; if (state == kUninitialized) { - state = AbslContainerInternalSampleEverything() ? kForce : kDontForce; + state = ABSL_INTERNAL_C_SYMBOL(AbslContainerInternalSampleEverything)() + ? kForce + : kDontForce; global_state.store(state, std::memory_order_relaxed); } return state == kForce; } -HashtablezInfo* SampleSlow(int64_t* next_sample) { +HashtablezInfo* SampleSlow(int64_t* next_sample, size_t inline_element_size) { if (ABSL_PREDICT_FALSE(ShouldForceSampling())) { *next_sample = 1; - return HashtablezSampler::Global().Register(); + HashtablezInfo* result = GlobalHashtablezSampler().Register(); + result->inline_element_size = inline_element_size; + return result; } #if !defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE) @@ -210,15 +128,17 @@ HashtablezInfo* SampleSlow(int64_t* next_sample) { // that case. if (first) { if (ABSL_PREDICT_TRUE(--*next_sample > 0)) return nullptr; - return SampleSlow(next_sample); + return SampleSlow(next_sample, inline_element_size); } - return HashtablezSampler::Global().Register(); + HashtablezInfo* result = GlobalHashtablezSampler().Register(); + result->inline_element_size = inline_element_size; + return result; #endif } void UnsampleSlow(HashtablezInfo* info) { - HashtablezSampler::Global().Unregister(info); + GlobalHashtablezSampler().Unregister(info); } void RecordInsertSlow(HashtablezInfo* info, size_t hash, @@ -226,7 +146,7 @@ void RecordInsertSlow(HashtablezInfo* info, size_t hash, // SwissTables probe in groups of 16, so scale this to count items probes and // not offset from desired. size_t probe_length = distance_from_desired; -#if SWISSTABLE_HAVE_SSE2 +#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2 probe_length /= 16; #else probe_length /= 8; @@ -234,6 +154,7 @@ void RecordInsertSlow(HashtablezInfo* info, size_t hash, info->hashes_bitwise_and.fetch_and(hash, std::memory_order_relaxed); info->hashes_bitwise_or.fetch_or(hash, std::memory_order_relaxed); + info->hashes_bitwise_xor.fetch_xor(hash, std::memory_order_relaxed); info->max_probe_length.store( std::max(info->max_probe_length.load(std::memory_order_relaxed), probe_length), @@ -257,7 +178,7 @@ void SetHashtablezSampleParameter(int32_t rate) { void SetHashtablezMaxSamples(int32_t max) { if (max > 0) { - g_hashtablez_max_samples.store(max, std::memory_order_release); + GlobalHashtablezSampler().SetMaxSamples(max); } else { ABSL_RAW_LOG(ERROR, "Invalid hashtablez max samples: %lld", static_cast<long long>(max)); // NOLINT(runtime/int) diff --git a/third_party/abseil-cpp/absl/container/internal/hashtablez_sampler.h b/third_party/abseil-cpp/absl/container/internal/hashtablez_sampler.h index 34d5e5723c..91fcdb34a3 100644 --- a/third_party/abseil-cpp/absl/container/internal/hashtablez_sampler.h +++ b/third_party/abseil-cpp/absl/container/internal/hashtablez_sampler.h @@ -47,6 +47,7 @@ #include "absl/base/internal/per_thread_tls.h" #include "absl/base/optimization.h" #include "absl/container/internal/have_sse.h" +#include "absl/profiling/internal/sample_recorder.h" #include "absl/synchronization/mutex.h" #include "absl/utility/utility.h" @@ -57,7 +58,7 @@ namespace container_internal { // Stores information about a sampled hashtable. All mutations to this *must* // be made through `Record*` functions below. All reads from this *must* only // occur in the callback to `HashtablezSampler::Iterate`. -struct HashtablezInfo { +struct HashtablezInfo : public profiling_internal::Sample<HashtablezInfo> { // Constructs the object but does not fill in any fields. HashtablezInfo(); ~HashtablezInfo(); @@ -73,18 +74,13 @@ struct HashtablezInfo { std::atomic<size_t> capacity; std::atomic<size_t> size; std::atomic<size_t> num_erases; + std::atomic<size_t> num_rehashes; std::atomic<size_t> max_probe_length; std::atomic<size_t> total_probe_length; std::atomic<size_t> hashes_bitwise_or; std::atomic<size_t> hashes_bitwise_and; - - // `HashtablezSampler` maintains intrusive linked lists for all samples. See - // comments on `HashtablezSampler::all_` for details on these. `init_mu` - // guards the ability to restore the sample to a pristine state. This - // prevents races with sampling and resurrecting an object. - absl::Mutex init_mu; - HashtablezInfo* next; - HashtablezInfo* dead ABSL_GUARDED_BY(init_mu); + std::atomic<size_t> hashes_bitwise_xor; + std::atomic<size_t> max_reserve; // All of the fields below are set by `PrepareForSampling`, they must not be // mutated in `Record*` functions. They are logically `const` in that sense. @@ -95,16 +91,34 @@ struct HashtablezInfo { absl::Time create_time; int32_t depth; void* stack[kMaxStackDepth]; + size_t inline_element_size; }; inline void RecordRehashSlow(HashtablezInfo* info, size_t total_probe_length) { -#if SWISSTABLE_HAVE_SSE2 +#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2 total_probe_length /= 16; #else total_probe_length /= 8; #endif info->total_probe_length.store(total_probe_length, std::memory_order_relaxed); info->num_erases.store(0, std::memory_order_relaxed); + // There is only one concurrent writer, so `load` then `store` is sufficient + // instead of using `fetch_add`. + info->num_rehashes.store( + 1 + info->num_rehashes.load(std::memory_order_relaxed), + std::memory_order_relaxed); +} + +inline void RecordReservationSlow(HashtablezInfo* info, + size_t target_capacity) { + info->max_reserve.store( + (std::max)(info->max_reserve.load(std::memory_order_relaxed), + target_capacity), + std::memory_order_relaxed); +} + +inline void RecordClearedReservationSlow(HashtablezInfo* info) { + info->max_reserve.store(0, std::memory_order_relaxed); } inline void RecordStorageChangedSlow(HashtablezInfo* info, size_t size, @@ -113,7 +127,8 @@ inline void RecordStorageChangedSlow(HashtablezInfo* info, size_t size, info->capacity.store(capacity, std::memory_order_relaxed); if (size == 0) { // This is a clear, reset the total/num_erases too. - RecordRehashSlow(info, 0); + info->total_probe_length.store(0, std::memory_order_relaxed); + info->num_erases.store(0, std::memory_order_relaxed); } } @@ -122,12 +137,21 @@ void RecordInsertSlow(HashtablezInfo* info, size_t hash, inline void RecordEraseSlow(HashtablezInfo* info) { info->size.fetch_sub(1, std::memory_order_relaxed); - info->num_erases.fetch_add(1, std::memory_order_relaxed); + // There is only one concurrent writer, so `load` then `store` is sufficient + // instead of using `fetch_add`. + info->num_erases.store( + 1 + info->num_erases.load(std::memory_order_relaxed), + std::memory_order_relaxed); } -HashtablezInfo* SampleSlow(int64_t* next_sample); +HashtablezInfo* SampleSlow(int64_t* next_sample, size_t inline_element_size); void UnsampleSlow(HashtablezInfo* info); +#if defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE) +#error ABSL_INTERNAL_HASHTABLEZ_SAMPLE cannot be directly set +#endif // defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE) + +#if defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE) class HashtablezInfoHandle { public: explicit HashtablezInfoHandle() : info_(nullptr) {} @@ -160,6 +184,16 @@ class HashtablezInfoHandle { RecordRehashSlow(info_, total_probe_length); } + inline void RecordReservation(size_t target_capacity) { + if (ABSL_PREDICT_TRUE(info_ == nullptr)) return; + RecordReservationSlow(info_, target_capacity); + } + + inline void RecordClearedReservation() { + if (ABSL_PREDICT_TRUE(info_ == nullptr)) return; + RecordClearedReservationSlow(info_); + } + inline void RecordInsert(size_t hash, size_t distance_from_desired) { if (ABSL_PREDICT_TRUE(info_ == nullptr)) return; RecordInsertSlow(info_, hash, distance_from_desired); @@ -179,100 +213,50 @@ class HashtablezInfoHandle { friend class HashtablezInfoHandlePeer; HashtablezInfo* info_; }; - -#if defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE) -#error ABSL_INTERNAL_HASHTABLEZ_SAMPLE cannot be directly set +#else +// Ensure that when Hashtablez is turned off at compile time, HashtablezInfo can +// be removed by the linker, in order to reduce the binary size. +class HashtablezInfoHandle { + public: + explicit HashtablezInfoHandle() = default; + explicit HashtablezInfoHandle(std::nullptr_t) {} + + inline void RecordStorageChanged(size_t /*size*/, size_t /*capacity*/) {} + inline void RecordRehash(size_t /*total_probe_length*/) {} + inline void RecordReservation(size_t /*target_capacity*/) {} + inline void RecordClearedReservation() {} + inline void RecordInsert(size_t /*hash*/, size_t /*distance_from_desired*/) {} + inline void RecordErase() {} + + friend inline void swap(HashtablezInfoHandle& /*lhs*/, + HashtablezInfoHandle& /*rhs*/) {} +}; #endif // defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE) -#if (ABSL_PER_THREAD_TLS == 1) && !defined(ABSL_BUILD_DLL) && \ - !defined(ABSL_CONSUME_DLL) -#define ABSL_INTERNAL_HASHTABLEZ_SAMPLE -#endif - #if defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE) extern ABSL_PER_THREAD_TLS_KEYWORD int64_t global_next_sample; -#endif // ABSL_PER_THREAD_TLS +#endif // defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE) // Returns an RAII sampling handle that manages registration and unregistation // with the global sampler. -inline HashtablezInfoHandle Sample() { +inline HashtablezInfoHandle Sample( + size_t inline_element_size ABSL_ATTRIBUTE_UNUSED) { #if defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE) if (ABSL_PREDICT_TRUE(--global_next_sample > 0)) { return HashtablezInfoHandle(nullptr); } - return HashtablezInfoHandle(SampleSlow(&global_next_sample)); + return HashtablezInfoHandle( + SampleSlow(&global_next_sample, inline_element_size)); #else return HashtablezInfoHandle(nullptr); #endif // !ABSL_PER_THREAD_TLS } -// Holds samples and their associated stack traces with a soft limit of -// `SetHashtablezMaxSamples()`. -// -// Thread safe. -class HashtablezSampler { - public: - // Returns a global Sampler. - static HashtablezSampler& Global(); - - HashtablezSampler(); - ~HashtablezSampler(); - - // Registers for sampling. Returns an opaque registration info. - HashtablezInfo* Register(); - - // Unregisters the sample. - void Unregister(HashtablezInfo* sample); +using HashtablezSampler = + ::absl::profiling_internal::SampleRecorder<HashtablezInfo>; - // The dispose callback will be called on all samples the moment they are - // being unregistered. Only affects samples that are unregistered after the - // callback has been set. - // Returns the previous callback. - using DisposeCallback = void (*)(const HashtablezInfo&); - DisposeCallback SetDisposeCallback(DisposeCallback f); - - // Iterates over all the registered `StackInfo`s. Returning the number of - // samples that have been dropped. - int64_t Iterate(const std::function<void(const HashtablezInfo& stack)>& f); - - private: - void PushNew(HashtablezInfo* sample); - void PushDead(HashtablezInfo* sample); - HashtablezInfo* PopDead(); - - std::atomic<size_t> dropped_samples_; - std::atomic<size_t> size_estimate_; - - // Intrusive lock free linked lists for tracking samples. - // - // `all_` records all samples (they are never removed from this list) and is - // terminated with a `nullptr`. - // - // `graveyard_.dead` is a circular linked list. When it is empty, - // `graveyard_.dead == &graveyard`. The list is circular so that - // every item on it (even the last) has a non-null dead pointer. This allows - // `Iterate` to determine if a given sample is live or dead using only - // information on the sample itself. - // - // For example, nodes [A, B, C, D, E] with [A, C, E] alive and [B, D] dead - // looks like this (G is the Graveyard): - // - // +---+ +---+ +---+ +---+ +---+ - // all -->| A |--->| B |--->| C |--->| D |--->| E | - // | | | | | | | | | | - // +---+ | | +->| |-+ | | +->| |-+ | | - // | G | +---+ | +---+ | +---+ | +---+ | +---+ - // | | | | | | - // | | --------+ +--------+ | - // +---+ | - // ^ | - // +--------------------------------------+ - // - std::atomic<HashtablezInfo*> all_; - HashtablezInfo graveyard_; - - std::atomic<DisposeCallback> dispose_; -}; +// Returns a global Sampler. +HashtablezSampler& GlobalHashtablezSampler(); // Enables or disables sampling for Swiss tables. void SetHashtablezEnabled(bool enabled); @@ -288,7 +272,7 @@ void SetHashtablezMaxSamples(int32_t max); // initialization of static storage duration objects. // The definition of this constant is weak, which allows us to inject a // different value for it at link time. -extern "C" bool AbslContainerInternalSampleEverything(); +extern "C" bool ABSL_INTERNAL_C_SYMBOL(AbslContainerInternalSampleEverything)(); } // namespace container_internal ABSL_NAMESPACE_END diff --git a/third_party/abseil-cpp/absl/container/internal/hashtablez_sampler_force_weak_definition.cc b/third_party/abseil-cpp/absl/container/internal/hashtablez_sampler_force_weak_definition.cc index 78b9d362ac..ed35a7eec3 100644 --- a/third_party/abseil-cpp/absl/container/internal/hashtablez_sampler_force_weak_definition.cc +++ b/third_party/abseil-cpp/absl/container/internal/hashtablez_sampler_force_weak_definition.cc @@ -21,7 +21,8 @@ ABSL_NAMESPACE_BEGIN namespace container_internal { // See hashtablez_sampler.h for details. -extern "C" ABSL_ATTRIBUTE_WEAK bool AbslContainerInternalSampleEverything() { +extern "C" ABSL_ATTRIBUTE_WEAK bool ABSL_INTERNAL_C_SYMBOL( + AbslContainerInternalSampleEverything)() { return false; } diff --git a/third_party/abseil-cpp/absl/container/internal/hashtablez_sampler_test.cc b/third_party/abseil-cpp/absl/container/internal/hashtablez_sampler_test.cc index 36f5ccdd02..449619a32c 100644 --- a/third_party/abseil-cpp/absl/container/internal/hashtablez_sampler_test.cc +++ b/third_party/abseil-cpp/absl/container/internal/hashtablez_sampler_test.cc @@ -22,6 +22,7 @@ #include "gtest/gtest.h" #include "absl/base/attributes.h" #include "absl/container/internal/have_sse.h" +#include "absl/profiling/internal/sample_recorder.h" #include "absl/synchronization/blocking_counter.h" #include "absl/synchronization/internal/thread_pool.h" #include "absl/synchronization/mutex.h" @@ -29,7 +30,7 @@ #include "absl/time/clock.h" #include "absl/time/time.h" -#if SWISSTABLE_HAVE_SSE2 +#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2 constexpr int kProbeLength = 16; #else constexpr int kProbeLength = 8; @@ -38,6 +39,7 @@ constexpr int kProbeLength = 8; namespace absl { ABSL_NAMESPACE_BEGIN namespace container_internal { +#if defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE) class HashtablezInfoHandlePeer { public: static bool IsSampled(const HashtablezInfoHandle& h) { @@ -46,6 +48,13 @@ class HashtablezInfoHandlePeer { static HashtablezInfo* GetInfo(HashtablezInfoHandle* h) { return h->info_; } }; +#else +class HashtablezInfoHandlePeer { + public: + static bool IsSampled(const HashtablezInfoHandle&) { return false; } + static HashtablezInfo* GetInfo(HashtablezInfoHandle*) { return nullptr; } +}; +#endif // defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE) namespace { using ::absl::synchronization_internal::ThreadPool; @@ -69,18 +78,24 @@ HashtablezInfo* Register(HashtablezSampler* s, size_t size) { TEST(HashtablezInfoTest, PrepareForSampling) { absl::Time test_start = absl::Now(); + const size_t test_element_size = 17; HashtablezInfo info; absl::MutexLock l(&info.init_mu); info.PrepareForSampling(); + info.inline_element_size = test_element_size; EXPECT_EQ(info.capacity.load(), 0); EXPECT_EQ(info.size.load(), 0); EXPECT_EQ(info.num_erases.load(), 0); + EXPECT_EQ(info.num_rehashes.load(), 0); EXPECT_EQ(info.max_probe_length.load(), 0); EXPECT_EQ(info.total_probe_length.load(), 0); EXPECT_EQ(info.hashes_bitwise_or.load(), 0); EXPECT_EQ(info.hashes_bitwise_and.load(), ~size_t{}); + EXPECT_EQ(info.hashes_bitwise_xor.load(), 0); + EXPECT_EQ(info.max_reserve.load(), 0); EXPECT_GE(info.create_time, test_start); + EXPECT_EQ(info.inline_element_size, test_element_size); info.capacity.store(1, std::memory_order_relaxed); info.size.store(1, std::memory_order_relaxed); @@ -89,16 +104,22 @@ TEST(HashtablezInfoTest, PrepareForSampling) { info.total_probe_length.store(1, std::memory_order_relaxed); info.hashes_bitwise_or.store(1, std::memory_order_relaxed); info.hashes_bitwise_and.store(1, std::memory_order_relaxed); + info.hashes_bitwise_xor.store(1, std::memory_order_relaxed); + info.max_reserve.store(1, std::memory_order_relaxed); info.create_time = test_start - absl::Hours(20); info.PrepareForSampling(); EXPECT_EQ(info.capacity.load(), 0); EXPECT_EQ(info.size.load(), 0); EXPECT_EQ(info.num_erases.load(), 0); + EXPECT_EQ(info.num_rehashes.load(), 0); EXPECT_EQ(info.max_probe_length.load(), 0); EXPECT_EQ(info.total_probe_length.load(), 0); EXPECT_EQ(info.hashes_bitwise_or.load(), 0); EXPECT_EQ(info.hashes_bitwise_and.load(), ~size_t{}); + EXPECT_EQ(info.hashes_bitwise_xor.load(), 0); + EXPECT_EQ(info.max_reserve.load(), 0); + EXPECT_EQ(info.inline_element_size, test_element_size); EXPECT_GE(info.create_time, test_start); } @@ -123,20 +144,25 @@ TEST(HashtablezInfoTest, RecordInsert) { EXPECT_EQ(info.max_probe_length.load(), 6); EXPECT_EQ(info.hashes_bitwise_and.load(), 0x0000FF00); EXPECT_EQ(info.hashes_bitwise_or.load(), 0x0000FF00); + EXPECT_EQ(info.hashes_bitwise_xor.load(), 0x0000FF00); RecordInsertSlow(&info, 0x000FF000, 4 * kProbeLength); EXPECT_EQ(info.max_probe_length.load(), 6); EXPECT_EQ(info.hashes_bitwise_and.load(), 0x0000F000); EXPECT_EQ(info.hashes_bitwise_or.load(), 0x000FFF00); + EXPECT_EQ(info.hashes_bitwise_xor.load(), 0x000F0F00); RecordInsertSlow(&info, 0x00FF0000, 12 * kProbeLength); EXPECT_EQ(info.max_probe_length.load(), 12); EXPECT_EQ(info.hashes_bitwise_and.load(), 0x00000000); EXPECT_EQ(info.hashes_bitwise_or.load(), 0x00FFFF00); + EXPECT_EQ(info.hashes_bitwise_xor.load(), 0x00F00F00); } TEST(HashtablezInfoTest, RecordErase) { + const size_t test_element_size = 29; HashtablezInfo info; absl::MutexLock l(&info.init_mu); info.PrepareForSampling(); + info.inline_element_size = test_element_size; EXPECT_EQ(info.num_erases.load(), 0); EXPECT_EQ(info.size.load(), 0); RecordInsertSlow(&info, 0x0000FF00, 6 * kProbeLength); @@ -144,12 +170,15 @@ TEST(HashtablezInfoTest, RecordErase) { RecordEraseSlow(&info); EXPECT_EQ(info.size.load(), 0); EXPECT_EQ(info.num_erases.load(), 1); + EXPECT_EQ(info.inline_element_size, test_element_size); } TEST(HashtablezInfoTest, RecordRehash) { + const size_t test_element_size = 31; HashtablezInfo info; absl::MutexLock l(&info.init_mu); info.PrepareForSampling(); + info.inline_element_size = test_element_size; RecordInsertSlow(&info, 0x1, 0); RecordInsertSlow(&info, 0x2, kProbeLength); RecordInsertSlow(&info, 0x4, kProbeLength); @@ -167,16 +196,35 @@ TEST(HashtablezInfoTest, RecordRehash) { EXPECT_EQ(info.size.load(), 2); EXPECT_EQ(info.total_probe_length.load(), 3); EXPECT_EQ(info.num_erases.load(), 0); + EXPECT_EQ(info.num_rehashes.load(), 1); + EXPECT_EQ(info.inline_element_size, test_element_size); +} + +TEST(HashtablezInfoTest, RecordReservation) { + HashtablezInfo info; + absl::MutexLock l(&info.init_mu); + info.PrepareForSampling(); + RecordReservationSlow(&info, 3); + EXPECT_EQ(info.max_reserve.load(), 3); + + RecordReservationSlow(&info, 2); + // High watermark does not change + EXPECT_EQ(info.max_reserve.load(), 3); + + RecordReservationSlow(&info, 10); + // High watermark does change + EXPECT_EQ(info.max_reserve.load(), 10); } -#if defined(ABSL_HASHTABLEZ_SAMPLE) +#if defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE) TEST(HashtablezSamplerTest, SmallSampleParameter) { + const size_t test_element_size = 31; SetHashtablezEnabled(true); SetHashtablezSampleParameter(100); for (int i = 0; i < 1000; ++i) { int64_t next_sample = 0; - HashtablezInfo* sample = SampleSlow(&next_sample); + HashtablezInfo* sample = SampleSlow(&next_sample, test_element_size); EXPECT_GT(next_sample, 0); EXPECT_NE(sample, nullptr); UnsampleSlow(sample); @@ -184,12 +232,13 @@ TEST(HashtablezSamplerTest, SmallSampleParameter) { } TEST(HashtablezSamplerTest, LargeSampleParameter) { + const size_t test_element_size = 31; SetHashtablezEnabled(true); SetHashtablezSampleParameter(std::numeric_limits<int32_t>::max()); for (int i = 0; i < 1000; ++i) { int64_t next_sample = 0; - HashtablezInfo* sample = SampleSlow(&next_sample); + HashtablezInfo* sample = SampleSlow(&next_sample, test_element_size); EXPECT_GT(next_sample, 0); EXPECT_NE(sample, nullptr); UnsampleSlow(sample); @@ -197,13 +246,14 @@ TEST(HashtablezSamplerTest, LargeSampleParameter) { } TEST(HashtablezSamplerTest, Sample) { + const size_t test_element_size = 31; SetHashtablezEnabled(true); SetHashtablezSampleParameter(100); int64_t num_sampled = 0; int64_t total = 0; double sample_rate = 0.0; for (int i = 0; i < 1000000; ++i) { - HashtablezInfoHandle h = Sample(); + HashtablezInfoHandle h = Sample(test_element_size); ++total; if (HashtablezInfoHandlePeer::IsSampled(h)) { ++num_sampled; @@ -213,10 +263,9 @@ TEST(HashtablezSamplerTest, Sample) { } EXPECT_NEAR(sample_rate, 0.01, 0.005); } -#endif TEST(HashtablezSamplerTest, Handle) { - auto& sampler = HashtablezSampler::Global(); + auto& sampler = GlobalHashtablezSampler(); HashtablezInfoHandle h(sampler.Register()); auto* info = HashtablezInfoHandlePeer::GetInfo(&h); info->hashes_bitwise_and.store(0x12345678, std::memory_order_relaxed); @@ -243,6 +292,8 @@ TEST(HashtablezSamplerTest, Handle) { }); EXPECT_FALSE(found); } +#endif + TEST(HashtablezSamplerTest, Registration) { HashtablezSampler sampler; diff --git a/third_party/abseil-cpp/absl/container/internal/have_sse.h b/third_party/abseil-cpp/absl/container/internal/have_sse.h index 43414418db..e75e1a16d3 100644 --- a/third_party/abseil-cpp/absl/container/internal/have_sse.h +++ b/third_party/abseil-cpp/absl/container/internal/have_sse.h @@ -16,33 +16,34 @@ #ifndef ABSL_CONTAINER_INTERNAL_HAVE_SSE_H_ #define ABSL_CONTAINER_INTERNAL_HAVE_SSE_H_ -#ifndef SWISSTABLE_HAVE_SSE2 +#ifndef ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2 #if defined(__SSE2__) || \ (defined(_MSC_VER) && \ (defined(_M_X64) || (defined(_M_IX86) && _M_IX86_FP >= 2))) -#define SWISSTABLE_HAVE_SSE2 1 +#define ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2 1 #else -#define SWISSTABLE_HAVE_SSE2 0 +#define ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2 0 #endif #endif -#ifndef SWISSTABLE_HAVE_SSSE3 +#ifndef ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSSE3 #ifdef __SSSE3__ -#define SWISSTABLE_HAVE_SSSE3 1 +#define ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSSE3 1 #else -#define SWISSTABLE_HAVE_SSSE3 0 +#define ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSSE3 0 #endif #endif -#if SWISSTABLE_HAVE_SSSE3 && !SWISSTABLE_HAVE_SSE2 +#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSSE3 && \ + !ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2 #error "Bad configuration!" #endif -#if SWISSTABLE_HAVE_SSE2 +#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2 #include <emmintrin.h> #endif -#if SWISSTABLE_HAVE_SSSE3 +#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSSE3 #include <tmmintrin.h> #endif diff --git a/third_party/abseil-cpp/absl/container/internal/inlined_vector.h b/third_party/abseil-cpp/absl/container/internal/inlined_vector.h index 4d80b727bf..1d7d6cda72 100644 --- a/third_party/abseil-cpp/absl/container/internal/inlined_vector.h +++ b/third_party/abseil-cpp/absl/container/internal/inlined_vector.h @@ -21,8 +21,11 @@ #include <iterator> #include <limits> #include <memory> +#include <new> +#include <type_traits> #include <utility> +#include "absl/base/attributes.h" #include "absl/base/macros.h" #include "absl/container/internal/compressed_tuple.h" #include "absl/memory/memory.h" @@ -33,96 +36,135 @@ namespace absl { ABSL_NAMESPACE_BEGIN namespace inlined_vector_internal { +// GCC does not deal very well with the below code +#if !defined(__clang__) && defined(__GNUC__) +#pragma GCC diagnostic push +#pragma GCC diagnostic ignored "-Warray-bounds" +#pragma GCC diagnostic ignored "-Wmaybe-uninitialized" +#endif + +template <typename A> +using AllocatorTraits = std::allocator_traits<A>; +template <typename A> +using ValueType = typename AllocatorTraits<A>::value_type; +template <typename A> +using SizeType = typename AllocatorTraits<A>::size_type; +template <typename A> +using Pointer = typename AllocatorTraits<A>::pointer; +template <typename A> +using ConstPointer = typename AllocatorTraits<A>::const_pointer; +template <typename A> +using SizeType = typename AllocatorTraits<A>::size_type; +template <typename A> +using DifferenceType = typename AllocatorTraits<A>::difference_type; +template <typename A> +using Reference = ValueType<A>&; +template <typename A> +using ConstReference = const ValueType<A>&; +template <typename A> +using Iterator = Pointer<A>; +template <typename A> +using ConstIterator = ConstPointer<A>; +template <typename A> +using ReverseIterator = typename std::reverse_iterator<Iterator<A>>; +template <typename A> +using ConstReverseIterator = typename std::reverse_iterator<ConstIterator<A>>; +template <typename A> +using MoveIterator = typename std::move_iterator<Iterator<A>>; + template <typename Iterator> using IsAtLeastForwardIterator = std::is_convertible< typename std::iterator_traits<Iterator>::iterator_category, std::forward_iterator_tag>; -template <typename AllocatorType, - typename ValueType = - typename absl::allocator_traits<AllocatorType>::value_type> +template <typename A> using IsMemcpyOk = - absl::conjunction<std::is_same<AllocatorType, std::allocator<ValueType>>, - absl::is_trivially_copy_constructible<ValueType>, - absl::is_trivially_copy_assignable<ValueType>, - absl::is_trivially_destructible<ValueType>>; + absl::conjunction<std::is_same<A, std::allocator<ValueType<A>>>, + absl::is_trivially_copy_constructible<ValueType<A>>, + absl::is_trivially_copy_assignable<ValueType<A>>, + absl::is_trivially_destructible<ValueType<A>>>; + +template <typename T> +struct TypeIdentity { + using type = T; +}; -template <typename AllocatorType, typename Pointer, typename SizeType> -void DestroyElements(AllocatorType* alloc_ptr, Pointer destroy_first, - SizeType destroy_size) { - using AllocatorTraits = absl::allocator_traits<AllocatorType>; +// Used for function arguments in template functions to prevent ADL by forcing +// callers to explicitly specify the template parameter. +template <typename T> +using NoTypeDeduction = typename TypeIdentity<T>::type; +template <typename A> +void DestroyElements(NoTypeDeduction<A>& allocator, Pointer<A> destroy_first, + SizeType<A> destroy_size) { if (destroy_first != nullptr) { - for (auto i = destroy_size; i != 0;) { + for (SizeType<A> i = destroy_size; i != 0;) { --i; - AllocatorTraits::destroy(*alloc_ptr, destroy_first + i); - } - -#if !defined(NDEBUG) - { - using ValueType = typename AllocatorTraits::value_type; - - // Overwrite unused memory with `0xab` so we can catch uninitialized - // usage. - // - // Cast to `void*` to tell the compiler that we don't care that we might - // be scribbling on a vtable pointer. - void* memory_ptr = destroy_first; - auto memory_size = destroy_size * sizeof(ValueType); - std::memset(memory_ptr, 0xab, memory_size); + AllocatorTraits<A>::destroy(allocator, destroy_first + i); } -#endif // !defined(NDEBUG) } } -template <typename AllocatorType, typename Pointer, typename ValueAdapter, - typename SizeType> -void ConstructElements(AllocatorType* alloc_ptr, Pointer construct_first, - ValueAdapter* values_ptr, SizeType construct_size) { - for (SizeType i = 0; i < construct_size; ++i) { - ABSL_INTERNAL_TRY { - values_ptr->ConstructNext(alloc_ptr, construct_first + i); - } +template <typename A> +struct Allocation { + Pointer<A> data; + SizeType<A> capacity; +}; + +template <typename A, + bool IsOverAligned = + (alignof(ValueType<A>) > ABSL_INTERNAL_DEFAULT_NEW_ALIGNMENT)> +struct MallocAdapter { + static Allocation<A> Allocate(A& allocator, SizeType<A> requested_capacity) { + return {AllocatorTraits<A>::allocate(allocator, requested_capacity), + requested_capacity}; + } + + static void Deallocate(A& allocator, Pointer<A> pointer, + SizeType<A> capacity) { + AllocatorTraits<A>::deallocate(allocator, pointer, capacity); + } +}; + +template <typename A, typename ValueAdapter> +void ConstructElements(NoTypeDeduction<A>& allocator, + Pointer<A> construct_first, ValueAdapter& values, + SizeType<A> construct_size) { + for (SizeType<A> i = 0; i < construct_size; ++i) { + ABSL_INTERNAL_TRY { values.ConstructNext(allocator, construct_first + i); } ABSL_INTERNAL_CATCH_ANY { - inlined_vector_internal::DestroyElements(alloc_ptr, construct_first, i); + DestroyElements<A>(allocator, construct_first, i); ABSL_INTERNAL_RETHROW; } } } -template <typename Pointer, typename ValueAdapter, typename SizeType> -void AssignElements(Pointer assign_first, ValueAdapter* values_ptr, - SizeType assign_size) { - for (SizeType i = 0; i < assign_size; ++i) { - values_ptr->AssignNext(assign_first + i); +template <typename A, typename ValueAdapter> +void AssignElements(Pointer<A> assign_first, ValueAdapter& values, + SizeType<A> assign_size) { + for (SizeType<A> i = 0; i < assign_size; ++i) { + values.AssignNext(assign_first + i); } } -template <typename AllocatorType> +template <typename A> struct StorageView { - using AllocatorTraits = absl::allocator_traits<AllocatorType>; - using Pointer = typename AllocatorTraits::pointer; - using SizeType = typename AllocatorTraits::size_type; - - Pointer data; - SizeType size; - SizeType capacity; + Pointer<A> data; + SizeType<A> size; + SizeType<A> capacity; }; -template <typename AllocatorType, typename Iterator> +template <typename A, typename Iterator> class IteratorValueAdapter { - using AllocatorTraits = absl::allocator_traits<AllocatorType>; - using Pointer = typename AllocatorTraits::pointer; - public: explicit IteratorValueAdapter(const Iterator& it) : it_(it) {} - void ConstructNext(AllocatorType* alloc_ptr, Pointer construct_at) { - AllocatorTraits::construct(*alloc_ptr, construct_at, *it_); + void ConstructNext(A& allocator, Pointer<A> construct_at) { + AllocatorTraits<A>::construct(allocator, construct_at, *it_); ++it_; } - void AssignNext(Pointer assign_at) { + void AssignNext(Pointer<A> assign_at) { *assign_at = *it_; ++it_; } @@ -131,166 +173,123 @@ class IteratorValueAdapter { Iterator it_; }; -template <typename AllocatorType> +template <typename A> class CopyValueAdapter { - using AllocatorTraits = absl::allocator_traits<AllocatorType>; - using ValueType = typename AllocatorTraits::value_type; - using Pointer = typename AllocatorTraits::pointer; - using ConstPointer = typename AllocatorTraits::const_pointer; - public: - explicit CopyValueAdapter(const ValueType& v) : ptr_(std::addressof(v)) {} + explicit CopyValueAdapter(ConstPointer<A> p) : ptr_(p) {} - void ConstructNext(AllocatorType* alloc_ptr, Pointer construct_at) { - AllocatorTraits::construct(*alloc_ptr, construct_at, *ptr_); + void ConstructNext(A& allocator, Pointer<A> construct_at) { + AllocatorTraits<A>::construct(allocator, construct_at, *ptr_); } - void AssignNext(Pointer assign_at) { *assign_at = *ptr_; } + void AssignNext(Pointer<A> assign_at) { *assign_at = *ptr_; } private: - ConstPointer ptr_; + ConstPointer<A> ptr_; }; -template <typename AllocatorType> +template <typename A> class DefaultValueAdapter { - using AllocatorTraits = absl::allocator_traits<AllocatorType>; - using ValueType = typename AllocatorTraits::value_type; - using Pointer = typename AllocatorTraits::pointer; - public: explicit DefaultValueAdapter() {} - void ConstructNext(AllocatorType* alloc_ptr, Pointer construct_at) { - AllocatorTraits::construct(*alloc_ptr, construct_at); + void ConstructNext(A& allocator, Pointer<A> construct_at) { + AllocatorTraits<A>::construct(allocator, construct_at); } - void AssignNext(Pointer assign_at) { *assign_at = ValueType(); } + void AssignNext(Pointer<A> assign_at) { *assign_at = ValueType<A>(); } }; -template <typename AllocatorType> +template <typename A> class AllocationTransaction { - using AllocatorTraits = absl::allocator_traits<AllocatorType>; - using Pointer = typename AllocatorTraits::pointer; - using SizeType = typename AllocatorTraits::size_type; - public: - explicit AllocationTransaction(AllocatorType* alloc_ptr) - : alloc_data_(*alloc_ptr, nullptr) {} + explicit AllocationTransaction(A& allocator) + : allocator_data_(allocator, nullptr), capacity_(0) {} ~AllocationTransaction() { if (DidAllocate()) { - AllocatorTraits::deallocate(GetAllocator(), GetData(), GetCapacity()); + MallocAdapter<A>::Deallocate(GetAllocator(), GetData(), GetCapacity()); } } AllocationTransaction(const AllocationTransaction&) = delete; void operator=(const AllocationTransaction&) = delete; - AllocatorType& GetAllocator() { return alloc_data_.template get<0>(); } - Pointer& GetData() { return alloc_data_.template get<1>(); } - SizeType& GetCapacity() { return capacity_; } + A& GetAllocator() { return allocator_data_.template get<0>(); } + Pointer<A>& GetData() { return allocator_data_.template get<1>(); } + SizeType<A>& GetCapacity() { return capacity_; } bool DidAllocate() { return GetData() != nullptr; } - Pointer Allocate(SizeType capacity) { - GetData() = AllocatorTraits::allocate(GetAllocator(), capacity); - GetCapacity() = capacity; - return GetData(); + + Pointer<A> Allocate(SizeType<A> requested_capacity) { + Allocation<A> result = + MallocAdapter<A>::Allocate(GetAllocator(), requested_capacity); + GetData() = result.data; + GetCapacity() = result.capacity; + return result.data; + } + + ABSL_MUST_USE_RESULT Allocation<A> Release() && { + Allocation<A> result = {GetData(), GetCapacity()}; + Reset(); + return result; } + private: void Reset() { GetData() = nullptr; GetCapacity() = 0; } - private: - container_internal::CompressedTuple<AllocatorType, Pointer> alloc_data_; - SizeType capacity_ = 0; + container_internal::CompressedTuple<A, Pointer<A>> allocator_data_; + SizeType<A> capacity_; }; -template <typename AllocatorType> +template <typename A> class ConstructionTransaction { - using AllocatorTraits = absl::allocator_traits<AllocatorType>; - using Pointer = typename AllocatorTraits::pointer; - using SizeType = typename AllocatorTraits::size_type; - public: - explicit ConstructionTransaction(AllocatorType* alloc_ptr) - : alloc_data_(*alloc_ptr, nullptr) {} + explicit ConstructionTransaction(A& allocator) + : allocator_data_(allocator, nullptr), size_(0) {} ~ConstructionTransaction() { if (DidConstruct()) { - inlined_vector_internal::DestroyElements(std::addressof(GetAllocator()), - GetData(), GetSize()); + DestroyElements<A>(GetAllocator(), GetData(), GetSize()); } } ConstructionTransaction(const ConstructionTransaction&) = delete; void operator=(const ConstructionTransaction&) = delete; - AllocatorType& GetAllocator() { return alloc_data_.template get<0>(); } - Pointer& GetData() { return alloc_data_.template get<1>(); } - SizeType& GetSize() { return size_; } + A& GetAllocator() { return allocator_data_.template get<0>(); } + Pointer<A>& GetData() { return allocator_data_.template get<1>(); } + SizeType<A>& GetSize() { return size_; } bool DidConstruct() { return GetData() != nullptr; } template <typename ValueAdapter> - void Construct(Pointer data, ValueAdapter* values_ptr, SizeType size) { - inlined_vector_internal::ConstructElements(std::addressof(GetAllocator()), - data, values_ptr, size); + void Construct(Pointer<A> data, ValueAdapter& values, SizeType<A> size) { + ConstructElements<A>(GetAllocator(), data, values, size); GetData() = data; GetSize() = size; } - void Commit() { + void Commit() && { GetData() = nullptr; GetSize() = 0; } private: - container_internal::CompressedTuple<AllocatorType, Pointer> alloc_data_; - SizeType size_ = 0; + container_internal::CompressedTuple<A, Pointer<A>> allocator_data_; + SizeType<A> size_; }; template <typename T, size_t N, typename A> class Storage { public: - using AllocatorTraits = absl::allocator_traits<A>; - using allocator_type = typename AllocatorTraits::allocator_type; - using value_type = typename AllocatorTraits::value_type; - using pointer = typename AllocatorTraits::pointer; - using const_pointer = typename AllocatorTraits::const_pointer; - using size_type = typename AllocatorTraits::size_type; - using difference_type = typename AllocatorTraits::difference_type; - - using reference = value_type&; - using const_reference = const value_type&; - using RValueReference = value_type&&; - using iterator = pointer; - using const_iterator = const_pointer; - using reverse_iterator = std::reverse_iterator<iterator>; - using const_reverse_iterator = std::reverse_iterator<const_iterator>; - using MoveIterator = std::move_iterator<iterator>; - using IsMemcpyOk = inlined_vector_internal::IsMemcpyOk<allocator_type>; - - using StorageView = inlined_vector_internal::StorageView<allocator_type>; - - template <typename Iterator> - using IteratorValueAdapter = - inlined_vector_internal::IteratorValueAdapter<allocator_type, Iterator>; - using CopyValueAdapter = - inlined_vector_internal::CopyValueAdapter<allocator_type>; - using DefaultValueAdapter = - inlined_vector_internal::DefaultValueAdapter<allocator_type>; - - using AllocationTransaction = - inlined_vector_internal::AllocationTransaction<allocator_type>; - using ConstructionTransaction = - inlined_vector_internal::ConstructionTransaction<allocator_type>; - - static size_type NextCapacity(size_type current_capacity) { + static SizeType<A> NextCapacity(SizeType<A> current_capacity) { return current_capacity * 2; } - static size_type ComputeCapacity(size_type current_capacity, - size_type requested_capacity) { + static SizeType<A> ComputeCapacity(SizeType<A> current_capacity, + SizeType<A> requested_capacity) { return (std::max)(NextCapacity(current_capacity), requested_capacity); } @@ -298,140 +297,137 @@ class Storage { // Storage Constructors and Destructor // --------------------------------------------------------------------------- - Storage() : metadata_() {} + Storage() : metadata_(A(), /* size and is_allocated */ 0) {} - explicit Storage(const allocator_type& alloc) : metadata_(alloc, {}) {} + explicit Storage(const A& allocator) + : metadata_(allocator, /* size and is_allocated */ 0) {} ~Storage() { - pointer data = GetIsAllocated() ? GetAllocatedData() : GetInlinedData(); - inlined_vector_internal::DestroyElements(GetAllocPtr(), data, GetSize()); - DeallocateIfAllocated(); + if (GetSizeAndIsAllocated() == 0) { + // Empty and not allocated; nothing to do. + } else if (IsMemcpyOk<A>::value) { + // No destructors need to be run; just deallocate if necessary. + DeallocateIfAllocated(); + } else { + DestroyContents(); + } } // --------------------------------------------------------------------------- // Storage Member Accessors // --------------------------------------------------------------------------- - size_type& GetSizeAndIsAllocated() { return metadata_.template get<1>(); } + SizeType<A>& GetSizeAndIsAllocated() { return metadata_.template get<1>(); } - const size_type& GetSizeAndIsAllocated() const { + const SizeType<A>& GetSizeAndIsAllocated() const { return metadata_.template get<1>(); } - size_type GetSize() const { return GetSizeAndIsAllocated() >> 1; } + SizeType<A> GetSize() const { return GetSizeAndIsAllocated() >> 1; } bool GetIsAllocated() const { return GetSizeAndIsAllocated() & 1; } - pointer GetAllocatedData() { return data_.allocated.allocated_data; } + Pointer<A> GetAllocatedData() { return data_.allocated.allocated_data; } - const_pointer GetAllocatedData() const { + ConstPointer<A> GetAllocatedData() const { return data_.allocated.allocated_data; } - pointer GetInlinedData() { - return reinterpret_cast<pointer>( + Pointer<A> GetInlinedData() { + return reinterpret_cast<Pointer<A>>( std::addressof(data_.inlined.inlined_data[0])); } - const_pointer GetInlinedData() const { - return reinterpret_cast<const_pointer>( + ConstPointer<A> GetInlinedData() const { + return reinterpret_cast<ConstPointer<A>>( std::addressof(data_.inlined.inlined_data[0])); } - size_type GetAllocatedCapacity() const { + SizeType<A> GetAllocatedCapacity() const { return data_.allocated.allocated_capacity; } - size_type GetInlinedCapacity() const { return static_cast<size_type>(N); } + SizeType<A> GetInlinedCapacity() const { return static_cast<SizeType<A>>(N); } - StorageView MakeStorageView() { - return GetIsAllocated() - ? StorageView{GetAllocatedData(), GetSize(), - GetAllocatedCapacity()} - : StorageView{GetInlinedData(), GetSize(), GetInlinedCapacity()}; + StorageView<A> MakeStorageView() { + return GetIsAllocated() ? StorageView<A>{GetAllocatedData(), GetSize(), + GetAllocatedCapacity()} + : StorageView<A>{GetInlinedData(), GetSize(), + GetInlinedCapacity()}; } - allocator_type* GetAllocPtr() { - return std::addressof(metadata_.template get<0>()); - } + A& GetAllocator() { return metadata_.template get<0>(); } - const allocator_type* GetAllocPtr() const { - return std::addressof(metadata_.template get<0>()); - } + const A& GetAllocator() const { return metadata_.template get<0>(); } // --------------------------------------------------------------------------- // Storage Member Mutators // --------------------------------------------------------------------------- + ABSL_ATTRIBUTE_NOINLINE void InitFrom(const Storage& other); + template <typename ValueAdapter> - void Initialize(ValueAdapter values, size_type new_size); + void Initialize(ValueAdapter values, SizeType<A> new_size); template <typename ValueAdapter> - void Assign(ValueAdapter values, size_type new_size); + void Assign(ValueAdapter values, SizeType<A> new_size); template <typename ValueAdapter> - void Resize(ValueAdapter values, size_type new_size); + void Resize(ValueAdapter values, SizeType<A> new_size); template <typename ValueAdapter> - iterator Insert(const_iterator pos, ValueAdapter values, - size_type insert_count); + Iterator<A> Insert(ConstIterator<A> pos, ValueAdapter values, + SizeType<A> insert_count); template <typename... Args> - reference EmplaceBack(Args&&... args); + Reference<A> EmplaceBack(Args&&... args); - iterator Erase(const_iterator from, const_iterator to); + Iterator<A> Erase(ConstIterator<A> from, ConstIterator<A> to); - void Reserve(size_type requested_capacity); + void Reserve(SizeType<A> requested_capacity); void ShrinkToFit(); void Swap(Storage* other_storage_ptr); void SetIsAllocated() { - GetSizeAndIsAllocated() |= static_cast<size_type>(1); + GetSizeAndIsAllocated() |= static_cast<SizeType<A>>(1); } void UnsetIsAllocated() { - GetSizeAndIsAllocated() &= ((std::numeric_limits<size_type>::max)() - 1); + GetSizeAndIsAllocated() &= ((std::numeric_limits<SizeType<A>>::max)() - 1); } - void SetSize(size_type size) { + void SetSize(SizeType<A> size) { GetSizeAndIsAllocated() = - (size << 1) | static_cast<size_type>(GetIsAllocated()); + (size << 1) | static_cast<SizeType<A>>(GetIsAllocated()); } - void SetAllocatedSize(size_type size) { - GetSizeAndIsAllocated() = (size << 1) | static_cast<size_type>(1); + void SetAllocatedSize(SizeType<A> size) { + GetSizeAndIsAllocated() = (size << 1) | static_cast<SizeType<A>>(1); } - void SetInlinedSize(size_type size) { - GetSizeAndIsAllocated() = size << static_cast<size_type>(1); + void SetInlinedSize(SizeType<A> size) { + GetSizeAndIsAllocated() = size << static_cast<SizeType<A>>(1); } - void AddSize(size_type count) { - GetSizeAndIsAllocated() += count << static_cast<size_type>(1); + void AddSize(SizeType<A> count) { + GetSizeAndIsAllocated() += count << static_cast<SizeType<A>>(1); } - void SubtractSize(size_type count) { + void SubtractSize(SizeType<A> count) { assert(count <= GetSize()); - GetSizeAndIsAllocated() -= count << static_cast<size_type>(1); - } - - void SetAllocatedData(pointer data, size_type capacity) { - data_.allocated.allocated_data = data; - data_.allocated.allocated_capacity = capacity; + GetSizeAndIsAllocated() -= count << static_cast<SizeType<A>>(1); } - void AcquireAllocatedData(AllocationTransaction* allocation_tx_ptr) { - SetAllocatedData(allocation_tx_ptr->GetData(), - allocation_tx_ptr->GetCapacity()); - - allocation_tx_ptr->Reset(); + void SetAllocation(Allocation<A> allocation) { + data_.allocated.allocated_data = allocation.data; + data_.allocated.allocated_capacity = allocation.capacity; } void MemcpyFrom(const Storage& other_storage) { - assert(IsMemcpyOk::value || other_storage.GetIsAllocated()); + assert(IsMemcpyOk<A>::value || other_storage.GetIsAllocated()); GetSizeAndIsAllocated() = other_storage.GetSizeAndIsAllocated(); data_ = other_storage.data_; @@ -439,22 +435,23 @@ class Storage { void DeallocateIfAllocated() { if (GetIsAllocated()) { - AllocatorTraits::deallocate(*GetAllocPtr(), GetAllocatedData(), - GetAllocatedCapacity()); + MallocAdapter<A>::Deallocate(GetAllocator(), GetAllocatedData(), + GetAllocatedCapacity()); } } private: - using Metadata = - container_internal::CompressedTuple<allocator_type, size_type>; + ABSL_ATTRIBUTE_NOINLINE void DestroyContents(); + + using Metadata = container_internal::CompressedTuple<A, SizeType<A>>; struct Allocated { - pointer allocated_data; - size_type allocated_capacity; + Pointer<A> allocated_data; + SizeType<A> allocated_capacity; }; struct Inlined { - alignas(value_type) char inlined_data[sizeof(value_type[N])]; + alignas(ValueType<A>) char inlined_data[sizeof(ValueType<A>[N])]; }; union Data { @@ -462,33 +459,75 @@ class Storage { Inlined inlined; }; + template <typename... Args> + ABSL_ATTRIBUTE_NOINLINE Reference<A> EmplaceBackSlow(Args&&... args); + Metadata metadata_; Data data_; }; template <typename T, size_t N, typename A> +void Storage<T, N, A>::DestroyContents() { + Pointer<A> data = GetIsAllocated() ? GetAllocatedData() : GetInlinedData(); + DestroyElements<A>(GetAllocator(), data, GetSize()); + DeallocateIfAllocated(); +} + +template <typename T, size_t N, typename A> +void Storage<T, N, A>::InitFrom(const Storage& other) { + const SizeType<A> n = other.GetSize(); + assert(n > 0); // Empty sources handled handled in caller. + ConstPointer<A> src; + Pointer<A> dst; + if (!other.GetIsAllocated()) { + dst = GetInlinedData(); + src = other.GetInlinedData(); + } else { + // Because this is only called from the `InlinedVector` constructors, it's + // safe to take on the allocation with size `0`. If `ConstructElements(...)` + // throws, deallocation will be automatically handled by `~Storage()`. + SizeType<A> requested_capacity = ComputeCapacity(GetInlinedCapacity(), n); + Allocation<A> allocation = + MallocAdapter<A>::Allocate(GetAllocator(), requested_capacity); + SetAllocation(allocation); + dst = allocation.data; + src = other.GetAllocatedData(); + } + if (IsMemcpyOk<A>::value) { + std::memcpy(reinterpret_cast<char*>(dst), + reinterpret_cast<const char*>(src), n * sizeof(ValueType<A>)); + } else { + auto values = IteratorValueAdapter<A, ConstPointer<A>>(src); + ConstructElements<A>(GetAllocator(), dst, values, n); + } + GetSizeAndIsAllocated() = other.GetSizeAndIsAllocated(); +} + +template <typename T, size_t N, typename A> template <typename ValueAdapter> -auto Storage<T, N, A>::Initialize(ValueAdapter values, size_type new_size) +auto Storage<T, N, A>::Initialize(ValueAdapter values, SizeType<A> new_size) -> void { // Only callable from constructors! assert(!GetIsAllocated()); assert(GetSize() == 0); - pointer construct_data; + Pointer<A> construct_data; if (new_size > GetInlinedCapacity()) { // Because this is only called from the `InlinedVector` constructors, it's // safe to take on the allocation with size `0`. If `ConstructElements(...)` // throws, deallocation will be automatically handled by `~Storage()`. - size_type new_capacity = ComputeCapacity(GetInlinedCapacity(), new_size); - construct_data = AllocatorTraits::allocate(*GetAllocPtr(), new_capacity); - SetAllocatedData(construct_data, new_capacity); + SizeType<A> requested_capacity = + ComputeCapacity(GetInlinedCapacity(), new_size); + Allocation<A> allocation = + MallocAdapter<A>::Allocate(GetAllocator(), requested_capacity); + construct_data = allocation.data; + SetAllocation(allocation); SetIsAllocated(); } else { construct_data = GetInlinedData(); } - inlined_vector_internal::ConstructElements(GetAllocPtr(), construct_data, - &values, new_size); + ConstructElements<A>(GetAllocator(), construct_data, values, new_size); // Since the initial size was guaranteed to be `0` and the allocated bit is // already correct for either case, *adding* `new_size` gives us the correct @@ -498,18 +537,20 @@ auto Storage<T, N, A>::Initialize(ValueAdapter values, size_type new_size) template <typename T, size_t N, typename A> template <typename ValueAdapter> -auto Storage<T, N, A>::Assign(ValueAdapter values, size_type new_size) -> void { - StorageView storage_view = MakeStorageView(); +auto Storage<T, N, A>::Assign(ValueAdapter values, SizeType<A> new_size) + -> void { + StorageView<A> storage_view = MakeStorageView(); - AllocationTransaction allocation_tx(GetAllocPtr()); + AllocationTransaction<A> allocation_tx(GetAllocator()); - absl::Span<value_type> assign_loop; - absl::Span<value_type> construct_loop; - absl::Span<value_type> destroy_loop; + absl::Span<ValueType<A>> assign_loop; + absl::Span<ValueType<A>> construct_loop; + absl::Span<ValueType<A>> destroy_loop; if (new_size > storage_view.capacity) { - size_type new_capacity = ComputeCapacity(storage_view.capacity, new_size); - construct_loop = {allocation_tx.Allocate(new_capacity), new_size}; + SizeType<A> requested_capacity = + ComputeCapacity(storage_view.capacity, new_size); + construct_loop = {allocation_tx.Allocate(requested_capacity), new_size}; destroy_loop = {storage_view.data, storage_view.size}; } else if (new_size > storage_view.size) { assign_loop = {storage_view.data, storage_view.size}; @@ -520,18 +561,16 @@ auto Storage<T, N, A>::Assign(ValueAdapter values, size_type new_size) -> void { destroy_loop = {storage_view.data + new_size, storage_view.size - new_size}; } - inlined_vector_internal::AssignElements(assign_loop.data(), &values, - assign_loop.size()); + AssignElements<A>(assign_loop.data(), values, assign_loop.size()); - inlined_vector_internal::ConstructElements( - GetAllocPtr(), construct_loop.data(), &values, construct_loop.size()); + ConstructElements<A>(GetAllocator(), construct_loop.data(), values, + construct_loop.size()); - inlined_vector_internal::DestroyElements(GetAllocPtr(), destroy_loop.data(), - destroy_loop.size()); + DestroyElements<A>(GetAllocator(), destroy_loop.data(), destroy_loop.size()); if (allocation_tx.DidAllocate()) { DeallocateIfAllocated(); - AcquireAllocatedData(&allocation_tx); + SetAllocation(std::move(allocation_tx).Release()); SetIsAllocated(); } @@ -540,125 +579,119 @@ auto Storage<T, N, A>::Assign(ValueAdapter values, size_type new_size) -> void { template <typename T, size_t N, typename A> template <typename ValueAdapter> -auto Storage<T, N, A>::Resize(ValueAdapter values, size_type new_size) -> void { - StorageView storage_view = MakeStorageView(); - - IteratorValueAdapter<MoveIterator> move_values( - MoveIterator(storage_view.data)); - - AllocationTransaction allocation_tx(GetAllocPtr()); - ConstructionTransaction construction_tx(GetAllocPtr()); - - absl::Span<value_type> construct_loop; - absl::Span<value_type> move_construct_loop; - absl::Span<value_type> destroy_loop; - - if (new_size > storage_view.capacity) { - size_type new_capacity = ComputeCapacity(storage_view.capacity, new_size); - pointer new_data = allocation_tx.Allocate(new_capacity); - construct_loop = {new_data + storage_view.size, - new_size - storage_view.size}; - move_construct_loop = {new_data, storage_view.size}; - destroy_loop = {storage_view.data, storage_view.size}; - } else if (new_size > storage_view.size) { - construct_loop = {storage_view.data + storage_view.size, - new_size - storage_view.size}; +auto Storage<T, N, A>::Resize(ValueAdapter values, SizeType<A> new_size) + -> void { + StorageView<A> storage_view = MakeStorageView(); + Pointer<A> const base = storage_view.data; + const SizeType<A> size = storage_view.size; + A& alloc = GetAllocator(); + if (new_size <= size) { + // Destroy extra old elements. + DestroyElements<A>(alloc, base + new_size, size - new_size); + } else if (new_size <= storage_view.capacity) { + // Construct new elements in place. + ConstructElements<A>(alloc, base + size, values, new_size - size); } else { - destroy_loop = {storage_view.data + new_size, storage_view.size - new_size}; - } - - construction_tx.Construct(construct_loop.data(), &values, - construct_loop.size()); - - inlined_vector_internal::ConstructElements( - GetAllocPtr(), move_construct_loop.data(), &move_values, - move_construct_loop.size()); - - inlined_vector_internal::DestroyElements(GetAllocPtr(), destroy_loop.data(), - destroy_loop.size()); - - construction_tx.Commit(); - if (allocation_tx.DidAllocate()) { + // Steps: + // a. Allocate new backing store. + // b. Construct new elements in new backing store. + // c. Move existing elements from old backing store to now. + // d. Destroy all elements in old backing store. + // Use transactional wrappers for the first two steps so we can roll + // back if necessary due to exceptions. + AllocationTransaction<A> allocation_tx(alloc); + SizeType<A> requested_capacity = + ComputeCapacity(storage_view.capacity, new_size); + Pointer<A> new_data = allocation_tx.Allocate(requested_capacity); + + ConstructionTransaction<A> construction_tx(alloc); + construction_tx.Construct(new_data + size, values, new_size - size); + + IteratorValueAdapter<A, MoveIterator<A>> move_values( + (MoveIterator<A>(base))); + ConstructElements<A>(alloc, new_data, move_values, size); + + DestroyElements<A>(alloc, base, size); + std::move(construction_tx).Commit(); DeallocateIfAllocated(); - AcquireAllocatedData(&allocation_tx); + SetAllocation(std::move(allocation_tx).Release()); SetIsAllocated(); } - SetSize(new_size); } template <typename T, size_t N, typename A> template <typename ValueAdapter> -auto Storage<T, N, A>::Insert(const_iterator pos, ValueAdapter values, - size_type insert_count) -> iterator { - StorageView storage_view = MakeStorageView(); +auto Storage<T, N, A>::Insert(ConstIterator<A> pos, ValueAdapter values, + SizeType<A> insert_count) -> Iterator<A> { + StorageView<A> storage_view = MakeStorageView(); - size_type insert_index = - std::distance(const_iterator(storage_view.data), pos); - size_type insert_end_index = insert_index + insert_count; - size_type new_size = storage_view.size + insert_count; + SizeType<A> insert_index = + std::distance(ConstIterator<A>(storage_view.data), pos); + SizeType<A> insert_end_index = insert_index + insert_count; + SizeType<A> new_size = storage_view.size + insert_count; if (new_size > storage_view.capacity) { - AllocationTransaction allocation_tx(GetAllocPtr()); - ConstructionTransaction construction_tx(GetAllocPtr()); - ConstructionTransaction move_construciton_tx(GetAllocPtr()); + AllocationTransaction<A> allocation_tx(GetAllocator()); + ConstructionTransaction<A> construction_tx(GetAllocator()); + ConstructionTransaction<A> move_construction_tx(GetAllocator()); - IteratorValueAdapter<MoveIterator> move_values( - MoveIterator(storage_view.data)); + IteratorValueAdapter<A, MoveIterator<A>> move_values( + MoveIterator<A>(storage_view.data)); - size_type new_capacity = ComputeCapacity(storage_view.capacity, new_size); - pointer new_data = allocation_tx.Allocate(new_capacity); + SizeType<A> requested_capacity = + ComputeCapacity(storage_view.capacity, new_size); + Pointer<A> new_data = allocation_tx.Allocate(requested_capacity); - construction_tx.Construct(new_data + insert_index, &values, insert_count); + construction_tx.Construct(new_data + insert_index, values, insert_count); - move_construciton_tx.Construct(new_data, &move_values, insert_index); + move_construction_tx.Construct(new_data, move_values, insert_index); - inlined_vector_internal::ConstructElements( - GetAllocPtr(), new_data + insert_end_index, &move_values, - storage_view.size - insert_index); + ConstructElements<A>(GetAllocator(), new_data + insert_end_index, + move_values, storage_view.size - insert_index); - inlined_vector_internal::DestroyElements(GetAllocPtr(), storage_view.data, - storage_view.size); + DestroyElements<A>(GetAllocator(), storage_view.data, storage_view.size); - construction_tx.Commit(); - move_construciton_tx.Commit(); + std::move(construction_tx).Commit(); + std::move(move_construction_tx).Commit(); DeallocateIfAllocated(); - AcquireAllocatedData(&allocation_tx); + SetAllocation(std::move(allocation_tx).Release()); SetAllocatedSize(new_size); - return iterator(new_data + insert_index); + return Iterator<A>(new_data + insert_index); } else { - size_type move_construction_destination_index = + SizeType<A> move_construction_destination_index = (std::max)(insert_end_index, storage_view.size); - ConstructionTransaction move_construction_tx(GetAllocPtr()); + ConstructionTransaction<A> move_construction_tx(GetAllocator()); - IteratorValueAdapter<MoveIterator> move_construction_values( - MoveIterator(storage_view.data + - (move_construction_destination_index - insert_count))); - absl::Span<value_type> move_construction = { + IteratorValueAdapter<A, MoveIterator<A>> move_construction_values( + MoveIterator<A>(storage_view.data + + (move_construction_destination_index - insert_count))); + absl::Span<ValueType<A>> move_construction = { storage_view.data + move_construction_destination_index, new_size - move_construction_destination_index}; - pointer move_assignment_values = storage_view.data + insert_index; - absl::Span<value_type> move_assignment = { + Pointer<A> move_assignment_values = storage_view.data + insert_index; + absl::Span<ValueType<A>> move_assignment = { storage_view.data + insert_end_index, move_construction_destination_index - insert_end_index}; - absl::Span<value_type> insert_assignment = {move_assignment_values, - move_construction.size()}; + absl::Span<ValueType<A>> insert_assignment = {move_assignment_values, + move_construction.size()}; - absl::Span<value_type> insert_construction = { + absl::Span<ValueType<A>> insert_construction = { insert_assignment.data() + insert_assignment.size(), insert_count - insert_assignment.size()}; move_construction_tx.Construct(move_construction.data(), - &move_construction_values, + move_construction_values, move_construction.size()); - for (pointer destination = move_assignment.data() + move_assignment.size(), - last_destination = move_assignment.data(), - source = move_assignment_values + move_assignment.size(); + for (Pointer<A> + destination = move_assignment.data() + move_assignment.size(), + last_destination = move_assignment.data(), + source = move_assignment_values + move_assignment.size(); ;) { --destination; --source; @@ -666,114 +699,115 @@ auto Storage<T, N, A>::Insert(const_iterator pos, ValueAdapter values, *destination = std::move(*source); } - inlined_vector_internal::AssignElements(insert_assignment.data(), &values, - insert_assignment.size()); + AssignElements<A>(insert_assignment.data(), values, + insert_assignment.size()); - inlined_vector_internal::ConstructElements( - GetAllocPtr(), insert_construction.data(), &values, - insert_construction.size()); + ConstructElements<A>(GetAllocator(), insert_construction.data(), values, + insert_construction.size()); - move_construction_tx.Commit(); + std::move(move_construction_tx).Commit(); AddSize(insert_count); - return iterator(storage_view.data + insert_index); + return Iterator<A>(storage_view.data + insert_index); } } template <typename T, size_t N, typename A> template <typename... Args> -auto Storage<T, N, A>::EmplaceBack(Args&&... args) -> reference { - StorageView storage_view = MakeStorageView(); - - AllocationTransaction allocation_tx(GetAllocPtr()); - - IteratorValueAdapter<MoveIterator> move_values( - MoveIterator(storage_view.data)); +auto Storage<T, N, A>::EmplaceBack(Args&&... args) -> Reference<A> { + StorageView<A> storage_view = MakeStorageView(); + const SizeType<A> n = storage_view.size; + if (ABSL_PREDICT_TRUE(n != storage_view.capacity)) { + // Fast path; new element fits. + Pointer<A> last_ptr = storage_view.data + n; + AllocatorTraits<A>::construct(GetAllocator(), last_ptr, + std::forward<Args>(args)...); + AddSize(1); + return *last_ptr; + } + // TODO(b/173712035): Annotate with musttail attribute to prevent regression. + return EmplaceBackSlow(std::forward<Args>(args)...); +} - pointer construct_data; - if (storage_view.size == storage_view.capacity) { - size_type new_capacity = NextCapacity(storage_view.capacity); - construct_data = allocation_tx.Allocate(new_capacity); - } else { - construct_data = storage_view.data; +template <typename T, size_t N, typename A> +template <typename... Args> +auto Storage<T, N, A>::EmplaceBackSlow(Args&&... args) -> Reference<A> { + StorageView<A> storage_view = MakeStorageView(); + AllocationTransaction<A> allocation_tx(GetAllocator()); + IteratorValueAdapter<A, MoveIterator<A>> move_values( + MoveIterator<A>(storage_view.data)); + SizeType<A> requested_capacity = NextCapacity(storage_view.capacity); + Pointer<A> construct_data = allocation_tx.Allocate(requested_capacity); + Pointer<A> last_ptr = construct_data + storage_view.size; + + // Construct new element. + AllocatorTraits<A>::construct(GetAllocator(), last_ptr, + std::forward<Args>(args)...); + // Move elements from old backing store to new backing store. + ABSL_INTERNAL_TRY { + ConstructElements<A>(GetAllocator(), allocation_tx.GetData(), move_values, + storage_view.size); } - - pointer last_ptr = construct_data + storage_view.size; - - AllocatorTraits::construct(*GetAllocPtr(), last_ptr, - std::forward<Args>(args)...); - - if (allocation_tx.DidAllocate()) { - ABSL_INTERNAL_TRY { - inlined_vector_internal::ConstructElements( - GetAllocPtr(), allocation_tx.GetData(), &move_values, - storage_view.size); - } - ABSL_INTERNAL_CATCH_ANY { - AllocatorTraits::destroy(*GetAllocPtr(), last_ptr); - ABSL_INTERNAL_RETHROW; - } - - inlined_vector_internal::DestroyElements(GetAllocPtr(), storage_view.data, - storage_view.size); - - DeallocateIfAllocated(); - AcquireAllocatedData(&allocation_tx); - SetIsAllocated(); + ABSL_INTERNAL_CATCH_ANY { + AllocatorTraits<A>::destroy(GetAllocator(), last_ptr); + ABSL_INTERNAL_RETHROW; } + // Destroy elements in old backing store. + DestroyElements<A>(GetAllocator(), storage_view.data, storage_view.size); + DeallocateIfAllocated(); + SetAllocation(std::move(allocation_tx).Release()); + SetIsAllocated(); AddSize(1); return *last_ptr; } template <typename T, size_t N, typename A> -auto Storage<T, N, A>::Erase(const_iterator from, const_iterator to) - -> iterator { - StorageView storage_view = MakeStorageView(); +auto Storage<T, N, A>::Erase(ConstIterator<A> from, ConstIterator<A> to) + -> Iterator<A> { + StorageView<A> storage_view = MakeStorageView(); - size_type erase_size = std::distance(from, to); - size_type erase_index = - std::distance(const_iterator(storage_view.data), from); - size_type erase_end_index = erase_index + erase_size; + SizeType<A> erase_size = std::distance(from, to); + SizeType<A> erase_index = + std::distance(ConstIterator<A>(storage_view.data), from); + SizeType<A> erase_end_index = erase_index + erase_size; - IteratorValueAdapter<MoveIterator> move_values( - MoveIterator(storage_view.data + erase_end_index)); + IteratorValueAdapter<A, MoveIterator<A>> move_values( + MoveIterator<A>(storage_view.data + erase_end_index)); - inlined_vector_internal::AssignElements(storage_view.data + erase_index, - &move_values, - storage_view.size - erase_end_index); + AssignElements<A>(storage_view.data + erase_index, move_values, + storage_view.size - erase_end_index); - inlined_vector_internal::DestroyElements( - GetAllocPtr(), storage_view.data + (storage_view.size - erase_size), - erase_size); + DestroyElements<A>(GetAllocator(), + storage_view.data + (storage_view.size - erase_size), + erase_size); SubtractSize(erase_size); - return iterator(storage_view.data + erase_index); + return Iterator<A>(storage_view.data + erase_index); } template <typename T, size_t N, typename A> -auto Storage<T, N, A>::Reserve(size_type requested_capacity) -> void { - StorageView storage_view = MakeStorageView(); +auto Storage<T, N, A>::Reserve(SizeType<A> requested_capacity) -> void { + StorageView<A> storage_view = MakeStorageView(); if (ABSL_PREDICT_FALSE(requested_capacity <= storage_view.capacity)) return; - AllocationTransaction allocation_tx(GetAllocPtr()); + AllocationTransaction<A> allocation_tx(GetAllocator()); - IteratorValueAdapter<MoveIterator> move_values( - MoveIterator(storage_view.data)); + IteratorValueAdapter<A, MoveIterator<A>> move_values( + MoveIterator<A>(storage_view.data)); - size_type new_capacity = + SizeType<A> new_requested_capacity = ComputeCapacity(storage_view.capacity, requested_capacity); - pointer new_data = allocation_tx.Allocate(new_capacity); + Pointer<A> new_data = allocation_tx.Allocate(new_requested_capacity); - inlined_vector_internal::ConstructElements(GetAllocPtr(), new_data, - &move_values, storage_view.size); + ConstructElements<A>(GetAllocator(), new_data, move_values, + storage_view.size); - inlined_vector_internal::DestroyElements(GetAllocPtr(), storage_view.data, - storage_view.size); + DestroyElements<A>(GetAllocator(), storage_view.data, storage_view.size); DeallocateIfAllocated(); - AcquireAllocatedData(&allocation_tx); + SetAllocation(std::move(allocation_tx).Release()); SetIsAllocated(); } @@ -782,41 +816,44 @@ auto Storage<T, N, A>::ShrinkToFit() -> void { // May only be called on allocated instances! assert(GetIsAllocated()); - StorageView storage_view{GetAllocatedData(), GetSize(), - GetAllocatedCapacity()}; + StorageView<A> storage_view{GetAllocatedData(), GetSize(), + GetAllocatedCapacity()}; if (ABSL_PREDICT_FALSE(storage_view.size == storage_view.capacity)) return; - AllocationTransaction allocation_tx(GetAllocPtr()); + AllocationTransaction<A> allocation_tx(GetAllocator()); - IteratorValueAdapter<MoveIterator> move_values( - MoveIterator(storage_view.data)); + IteratorValueAdapter<A, MoveIterator<A>> move_values( + MoveIterator<A>(storage_view.data)); - pointer construct_data; + Pointer<A> construct_data; if (storage_view.size > GetInlinedCapacity()) { - size_type new_capacity = storage_view.size; - construct_data = allocation_tx.Allocate(new_capacity); + SizeType<A> requested_capacity = storage_view.size; + construct_data = allocation_tx.Allocate(requested_capacity); + if (allocation_tx.GetCapacity() >= storage_view.capacity) { + // Already using the smallest available heap allocation. + return; + } } else { construct_data = GetInlinedData(); } ABSL_INTERNAL_TRY { - inlined_vector_internal::ConstructElements(GetAllocPtr(), construct_data, - &move_values, storage_view.size); + ConstructElements<A>(GetAllocator(), construct_data, move_values, + storage_view.size); } ABSL_INTERNAL_CATCH_ANY { - SetAllocatedData(storage_view.data, storage_view.capacity); + SetAllocation({storage_view.data, storage_view.capacity}); ABSL_INTERNAL_RETHROW; } - inlined_vector_internal::DestroyElements(GetAllocPtr(), storage_view.data, - storage_view.size); + DestroyElements<A>(GetAllocator(), storage_view.data, storage_view.size); - AllocatorTraits::deallocate(*GetAllocPtr(), storage_view.data, - storage_view.capacity); + MallocAdapter<A>::Deallocate(GetAllocator(), storage_view.data, + storage_view.capacity); if (allocation_tx.DidAllocate()) { - AcquireAllocatedData(&allocation_tx); + SetAllocation(std::move(allocation_tx).Release()); } else { UnsetIsAllocated(); } @@ -834,57 +871,60 @@ auto Storage<T, N, A>::Swap(Storage* other_storage_ptr) -> void { Storage* large_ptr = other_storage_ptr; if (small_ptr->GetSize() > large_ptr->GetSize()) swap(small_ptr, large_ptr); - for (size_type i = 0; i < small_ptr->GetSize(); ++i) { + for (SizeType<A> i = 0; i < small_ptr->GetSize(); ++i) { swap(small_ptr->GetInlinedData()[i], large_ptr->GetInlinedData()[i]); } - IteratorValueAdapter<MoveIterator> move_values( - MoveIterator(large_ptr->GetInlinedData() + small_ptr->GetSize())); + IteratorValueAdapter<A, MoveIterator<A>> move_values( + MoveIterator<A>(large_ptr->GetInlinedData() + small_ptr->GetSize())); - inlined_vector_internal::ConstructElements( - large_ptr->GetAllocPtr(), - small_ptr->GetInlinedData() + small_ptr->GetSize(), &move_values, - large_ptr->GetSize() - small_ptr->GetSize()); + ConstructElements<A>(large_ptr->GetAllocator(), + small_ptr->GetInlinedData() + small_ptr->GetSize(), + move_values, + large_ptr->GetSize() - small_ptr->GetSize()); - inlined_vector_internal::DestroyElements( - large_ptr->GetAllocPtr(), - large_ptr->GetInlinedData() + small_ptr->GetSize(), - large_ptr->GetSize() - small_ptr->GetSize()); + DestroyElements<A>(large_ptr->GetAllocator(), + large_ptr->GetInlinedData() + small_ptr->GetSize(), + large_ptr->GetSize() - small_ptr->GetSize()); } else { Storage* allocated_ptr = this; Storage* inlined_ptr = other_storage_ptr; if (!allocated_ptr->GetIsAllocated()) swap(allocated_ptr, inlined_ptr); - StorageView allocated_storage_view{allocated_ptr->GetAllocatedData(), - allocated_ptr->GetSize(), - allocated_ptr->GetAllocatedCapacity()}; + StorageView<A> allocated_storage_view{ + allocated_ptr->GetAllocatedData(), allocated_ptr->GetSize(), + allocated_ptr->GetAllocatedCapacity()}; - IteratorValueAdapter<MoveIterator> move_values( - MoveIterator(inlined_ptr->GetInlinedData())); + IteratorValueAdapter<A, MoveIterator<A>> move_values( + MoveIterator<A>(inlined_ptr->GetInlinedData())); ABSL_INTERNAL_TRY { - inlined_vector_internal::ConstructElements( - inlined_ptr->GetAllocPtr(), allocated_ptr->GetInlinedData(), - &move_values, inlined_ptr->GetSize()); + ConstructElements<A>(inlined_ptr->GetAllocator(), + allocated_ptr->GetInlinedData(), move_values, + inlined_ptr->GetSize()); } ABSL_INTERNAL_CATCH_ANY { - allocated_ptr->SetAllocatedData(allocated_storage_view.data, - allocated_storage_view.capacity); + allocated_ptr->SetAllocation( + {allocated_storage_view.data, allocated_storage_view.capacity}); ABSL_INTERNAL_RETHROW; } - inlined_vector_internal::DestroyElements(inlined_ptr->GetAllocPtr(), - inlined_ptr->GetInlinedData(), - inlined_ptr->GetSize()); + DestroyElements<A>(inlined_ptr->GetAllocator(), + inlined_ptr->GetInlinedData(), inlined_ptr->GetSize()); - inlined_ptr->SetAllocatedData(allocated_storage_view.data, - allocated_storage_view.capacity); + inlined_ptr->SetAllocation( + {allocated_storage_view.data, allocated_storage_view.capacity}); } swap(GetSizeAndIsAllocated(), other_storage_ptr->GetSizeAndIsAllocated()); - swap(*GetAllocPtr(), *other_storage_ptr->GetAllocPtr()); + swap(GetAllocator(), other_storage_ptr->GetAllocator()); } +// End ignore "array-bounds" and "maybe-uninitialized" +#if !defined(__clang__) && defined(__GNUC__) +#pragma GCC diagnostic pop +#endif + } // namespace inlined_vector_internal ABSL_NAMESPACE_END } // namespace absl diff --git a/third_party/abseil-cpp/absl/container/internal/layout.h b/third_party/abseil-cpp/absl/container/internal/layout.h index 69cc85dd66..a59a243059 100644 --- a/third_party/abseil-cpp/absl/container/internal/layout.h +++ b/third_party/abseil-cpp/absl/container/internal/layout.h @@ -163,6 +163,7 @@ #include <assert.h> #include <stddef.h> #include <stdint.h> + #include <ostream> #include <string> #include <tuple> @@ -170,15 +171,16 @@ #include <typeinfo> #include <utility> -#ifdef ADDRESS_SANITIZER -#include <sanitizer/asan_interface.h> -#endif - +#include "absl/base/config.h" #include "absl/meta/type_traits.h" #include "absl/strings/str_cat.h" #include "absl/types/span.h" #include "absl/utility/utility.h" +#ifdef ABSL_HAVE_ADDRESS_SANITIZER +#include <sanitizer/asan_interface.h> +#endif + #if defined(__GXX_RTTI) #define ABSL_INTERNAL_HAS_CXA_DEMANGLE #endif @@ -402,7 +404,7 @@ class LayoutImpl<std::tuple<Elements...>, absl::index_sequence<SizeSeq...>, constexpr size_t Offset() const { static_assert(N < NumOffsets, "Index out of bounds"); return adl_barrier::Align( - Offset<N - 1>() + SizeOf<ElementType<N - 1>>() * size_[N - 1], + Offset<N - 1>() + SizeOf<ElementType<N - 1>>::value * size_[N - 1], ElementAlignment<N>::value); } @@ -595,7 +597,7 @@ class LayoutImpl<std::tuple<Elements...>, absl::index_sequence<SizeSeq...>, constexpr size_t AllocSize() const { static_assert(NumTypes == NumSizes, "You must specify sizes of all fields"); return Offset<NumTypes - 1>() + - SizeOf<ElementType<NumTypes - 1>>() * size_[NumTypes - 1]; + SizeOf<ElementType<NumTypes - 1>>::value * size_[NumTypes - 1]; } // If built with --config=asan, poisons padding bytes (if any) in the @@ -614,12 +616,12 @@ class LayoutImpl<std::tuple<Elements...>, absl::index_sequence<SizeSeq...>, void PoisonPadding(const Char* p) const { static_assert(N < NumOffsets, "Index out of bounds"); (void)p; -#ifdef ADDRESS_SANITIZER +#ifdef ABSL_HAVE_ADDRESS_SANITIZER PoisonPadding<Char, N - 1>(p); // The `if` is an optimization. It doesn't affect the observable behaviour. if (ElementAlignment<N - 1>::value % ElementAlignment<N>::value) { size_t start = - Offset<N - 1>() + SizeOf<ElementType<N - 1>>() * size_[N - 1]; + Offset<N - 1>() + SizeOf<ElementType<N - 1>>::value * size_[N - 1]; ASAN_POISON_MEMORY_REGION(p + start, Offset<N>() - start); } #endif @@ -643,7 +645,7 @@ class LayoutImpl<std::tuple<Elements...>, absl::index_sequence<SizeSeq...>, // produce "unsigned*" where another produces "unsigned int *". std::string DebugString() const { const auto offsets = Offsets(); - const size_t sizes[] = {SizeOf<ElementType<OffsetSeq>>()...}; + const size_t sizes[] = {SizeOf<ElementType<OffsetSeq>>::value...}; const std::string types[] = { adl_barrier::TypeName<ElementType<OffsetSeq>>()...}; std::string res = absl::StrCat("@0", types[0], "(", sizes[0], ")"); diff --git a/third_party/abseil-cpp/absl/container/internal/layout_benchmark.cc b/third_party/abseil-cpp/absl/container/internal/layout_benchmark.cc new file mode 100644 index 0000000000..d8636e8d5a --- /dev/null +++ b/third_party/abseil-cpp/absl/container/internal/layout_benchmark.cc @@ -0,0 +1,122 @@ +// 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 +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. +// +// Every benchmark should have the same performance as the corresponding +// headroom benchmark. + +#include "absl/base/internal/raw_logging.h" +#include "absl/container/internal/layout.h" +#include "benchmark/benchmark.h" + +namespace absl { +ABSL_NAMESPACE_BEGIN +namespace container_internal { +namespace { + +using ::benchmark::DoNotOptimize; + +using Int128 = int64_t[2]; + +// This benchmark provides the upper bound on performance for BM_OffsetConstant. +template <size_t Offset, class... Ts> +void BM_OffsetConstantHeadroom(benchmark::State& state) { + for (auto _ : state) { + DoNotOptimize(Offset); + } +} + +template <size_t Offset, class... Ts> +void BM_OffsetConstant(benchmark::State& state) { + using L = Layout<Ts...>; + ABSL_RAW_CHECK(L::Partial(3, 5, 7).template Offset<3>() == Offset, + "Invalid offset"); + for (auto _ : state) { + DoNotOptimize(L::Partial(3, 5, 7).template Offset<3>()); + } +} + +template <class... Ts> +size_t VariableOffset(size_t n, size_t m, size_t k); + +template <> +size_t VariableOffset<int8_t, int16_t, int32_t, Int128>(size_t n, size_t m, + size_t k) { + auto Align = [](size_t n, size_t m) { return (n + m - 1) & ~(m - 1); }; + return Align(Align(Align(n * 1, 2) + m * 2, 4) + k * 4, 8); +} + +template <> +size_t VariableOffset<Int128, int32_t, int16_t, int8_t>(size_t n, size_t m, + size_t k) { + // No alignment is necessary. + return n * 16 + m * 4 + k * 2; +} + +// This benchmark provides the upper bound on performance for BM_OffsetVariable. +template <size_t Offset, class... Ts> +void BM_OffsetVariableHeadroom(benchmark::State& state) { + size_t n = 3; + size_t m = 5; + size_t k = 7; + ABSL_RAW_CHECK(VariableOffset<Ts...>(n, m, k) == Offset, "Invalid offset"); + for (auto _ : state) { + DoNotOptimize(n); + DoNotOptimize(m); + DoNotOptimize(k); + DoNotOptimize(VariableOffset<Ts...>(n, m, k)); + } +} + +template <size_t Offset, class... Ts> +void BM_OffsetVariable(benchmark::State& state) { + using L = Layout<Ts...>; + size_t n = 3; + size_t m = 5; + size_t k = 7; + ABSL_RAW_CHECK(L::Partial(n, m, k).template Offset<3>() == Offset, + "Inavlid offset"); + for (auto _ : state) { + DoNotOptimize(n); + DoNotOptimize(m); + DoNotOptimize(k); + DoNotOptimize(L::Partial(n, m, k).template Offset<3>()); + } +} + +// Run all benchmarks in two modes: +// +// Layout with padding: int8_t[3], int16_t[5], int32_t[7], Int128[?]. +// Layout without padding: Int128[3], int32_t[5], int16_t[7], int8_t[?]. + +#define OFFSET_BENCHMARK(NAME, OFFSET, T1, T2, T3, T4) \ + auto& NAME##_##OFFSET##_##T1##_##T2##_##T3##_##T4 = \ + NAME<OFFSET, T1, T2, T3, T4>; \ + BENCHMARK(NAME##_##OFFSET##_##T1##_##T2##_##T3##_##T4) + +OFFSET_BENCHMARK(BM_OffsetConstantHeadroom, 48, int8_t, int16_t, int32_t, + Int128); +OFFSET_BENCHMARK(BM_OffsetConstant, 48, int8_t, int16_t, int32_t, Int128); +OFFSET_BENCHMARK(BM_OffsetConstantHeadroom, 82, Int128, int32_t, int16_t, + int8_t); +OFFSET_BENCHMARK(BM_OffsetConstant, 82, Int128, int32_t, int16_t, int8_t); +OFFSET_BENCHMARK(BM_OffsetVariableHeadroom, 48, int8_t, int16_t, int32_t, + Int128); +OFFSET_BENCHMARK(BM_OffsetVariable, 48, int8_t, int16_t, int32_t, Int128); +OFFSET_BENCHMARK(BM_OffsetVariableHeadroom, 82, Int128, int32_t, int16_t, + int8_t); +OFFSET_BENCHMARK(BM_OffsetVariable, 82, Int128, int32_t, int16_t, int8_t); +} // namespace +} // namespace container_internal +ABSL_NAMESPACE_END +} // namespace absl diff --git a/third_party/abseil-cpp/absl/container/internal/layout_test.cc b/third_party/abseil-cpp/absl/container/internal/layout_test.cc index 8f3628a1f1..54e5d5bbb8 100644 --- a/third_party/abseil-cpp/absl/container/internal/layout_test.cc +++ b/third_party/abseil-cpp/absl/container/internal/layout_test.cc @@ -17,6 +17,7 @@ // We need ::max_align_t because some libstdc++ versions don't provide // std::max_align_t #include <stddef.h> + #include <cstdint> #include <memory> #include <sstream> @@ -24,6 +25,7 @@ #include "gmock/gmock.h" #include "gtest/gtest.h" +#include "absl/base/config.h" #include "absl/base/internal/raw_logging.h" #include "absl/types/span.h" @@ -126,8 +128,10 @@ TEST(Layout, ElementTypes) { { using L = Layout<int32_t, int32_t>; SameType<std::tuple<int32_t, int32_t>, L::ElementTypes>(); - SameType<std::tuple<int32_t, int32_t>, decltype(L::Partial())::ElementTypes>(); - SameType<std::tuple<int32_t, int32_t>, decltype(L::Partial(0))::ElementTypes>(); + SameType<std::tuple<int32_t, int32_t>, + decltype(L::Partial())::ElementTypes>(); + SameType<std::tuple<int32_t, int32_t>, + decltype(L::Partial(0))::ElementTypes>(); } { using L = Layout<int8_t, int32_t, Int128>; @@ -366,18 +370,21 @@ TEST(Layout, PointerByIndex) { { using L = Layout<int32_t>; EXPECT_EQ(0, Distance(p, Type<const int32_t*>(L::Partial().Pointer<0>(p)))); - EXPECT_EQ(0, Distance(p, Type<const int32_t*>(L::Partial(3).Pointer<0>(p)))); + EXPECT_EQ(0, + Distance(p, Type<const int32_t*>(L::Partial(3).Pointer<0>(p)))); EXPECT_EQ(0, Distance(p, Type<const int32_t*>(L(3).Pointer<0>(p)))); } { using L = Layout<int32_t, int32_t>; EXPECT_EQ(0, Distance(p, Type<const int32_t*>(L::Partial().Pointer<0>(p)))); - EXPECT_EQ(0, Distance(p, Type<const int32_t*>(L::Partial(3).Pointer<0>(p)))); - EXPECT_EQ(12, Distance(p, Type<const int32_t*>(L::Partial(3).Pointer<1>(p)))); EXPECT_EQ(0, - Distance(p, Type<const int32_t*>(L::Partial(3, 5).Pointer<0>(p)))); + Distance(p, Type<const int32_t*>(L::Partial(3).Pointer<0>(p)))); EXPECT_EQ(12, - Distance(p, Type<const int32_t*>(L::Partial(3, 5).Pointer<1>(p)))); + Distance(p, Type<const int32_t*>(L::Partial(3).Pointer<1>(p)))); + EXPECT_EQ( + 0, Distance(p, Type<const int32_t*>(L::Partial(3, 5).Pointer<0>(p)))); + EXPECT_EQ( + 12, Distance(p, Type<const int32_t*>(L::Partial(3, 5).Pointer<1>(p)))); EXPECT_EQ(0, Distance(p, Type<const int32_t*>(L(3, 5).Pointer<0>(p)))); EXPECT_EQ(12, Distance(p, Type<const int32_t*>(L(3, 5).Pointer<1>(p)))); } @@ -385,39 +392,44 @@ TEST(Layout, PointerByIndex) { using L = Layout<int8_t, int32_t, Int128>; EXPECT_EQ(0, Distance(p, Type<const int8_t*>(L::Partial().Pointer<0>(p)))); EXPECT_EQ(0, Distance(p, Type<const int8_t*>(L::Partial(0).Pointer<0>(p)))); - EXPECT_EQ(0, Distance(p, Type<const int32_t*>(L::Partial(0).Pointer<1>(p)))); + EXPECT_EQ(0, + Distance(p, Type<const int32_t*>(L::Partial(0).Pointer<1>(p)))); EXPECT_EQ(0, Distance(p, Type<const int8_t*>(L::Partial(1).Pointer<0>(p)))); - EXPECT_EQ(4, Distance(p, Type<const int32_t*>(L::Partial(1).Pointer<1>(p)))); + EXPECT_EQ(4, + Distance(p, Type<const int32_t*>(L::Partial(1).Pointer<1>(p)))); EXPECT_EQ(0, Distance(p, Type<const int8_t*>(L::Partial(5).Pointer<0>(p)))); - EXPECT_EQ(8, Distance(p, Type<const int32_t*>(L::Partial(5).Pointer<1>(p)))); + EXPECT_EQ(8, + Distance(p, Type<const int32_t*>(L::Partial(5).Pointer<1>(p)))); EXPECT_EQ(0, Distance(p, Type<const int8_t*>(L::Partial(0, 0).Pointer<0>(p)))); - EXPECT_EQ(0, - Distance(p, Type<const int32_t*>(L::Partial(0, 0).Pointer<1>(p)))); + EXPECT_EQ( + 0, Distance(p, Type<const int32_t*>(L::Partial(0, 0).Pointer<1>(p)))); EXPECT_EQ(0, Distance(p, Type<const Int128*>(L::Partial(0, 0).Pointer<2>(p)))); EXPECT_EQ(0, Distance(p, Type<const int8_t*>(L::Partial(1, 0).Pointer<0>(p)))); - EXPECT_EQ(4, - Distance(p, Type<const int32_t*>(L::Partial(1, 0).Pointer<1>(p)))); + EXPECT_EQ( + 4, Distance(p, Type<const int32_t*>(L::Partial(1, 0).Pointer<1>(p)))); EXPECT_EQ(8, Distance(p, Type<const Int128*>(L::Partial(1, 0).Pointer<2>(p)))); EXPECT_EQ(0, Distance(p, Type<const int8_t*>(L::Partial(5, 3).Pointer<0>(p)))); - EXPECT_EQ(8, - Distance(p, Type<const int32_t*>(L::Partial(5, 3).Pointer<1>(p)))); + EXPECT_EQ( + 8, Distance(p, Type<const int32_t*>(L::Partial(5, 3).Pointer<1>(p)))); EXPECT_EQ(24, Distance(p, Type<const Int128*>(L::Partial(5, 3).Pointer<2>(p)))); EXPECT_EQ( 0, Distance(p, Type<const int8_t*>(L::Partial(0, 0, 0).Pointer<0>(p)))); EXPECT_EQ( - 0, Distance(p, Type<const int32_t*>(L::Partial(0, 0, 0).Pointer<1>(p)))); + 0, + Distance(p, Type<const int32_t*>(L::Partial(0, 0, 0).Pointer<1>(p)))); EXPECT_EQ( 0, Distance(p, Type<const Int128*>(L::Partial(0, 0, 0).Pointer<2>(p)))); EXPECT_EQ( 0, Distance(p, Type<const int8_t*>(L::Partial(1, 0, 0).Pointer<0>(p)))); EXPECT_EQ( - 4, Distance(p, Type<const int32_t*>(L::Partial(1, 0, 0).Pointer<1>(p)))); + 4, + Distance(p, Type<const int32_t*>(L::Partial(1, 0, 0).Pointer<1>(p)))); EXPECT_EQ( 8, Distance(p, Type<const Int128*>(L::Partial(1, 0, 0).Pointer<2>(p)))); EXPECT_EQ( @@ -426,7 +438,8 @@ TEST(Layout, PointerByIndex) { 24, Distance(p, Type<const Int128*>(L::Partial(5, 3, 1).Pointer<2>(p)))); EXPECT_EQ( - 8, Distance(p, Type<const int32_t*>(L::Partial(5, 3, 1).Pointer<1>(p)))); + 8, + Distance(p, Type<const int32_t*>(L::Partial(5, 3, 1).Pointer<1>(p)))); EXPECT_EQ(0, Distance(p, Type<const int8_t*>(L(5, 3, 1).Pointer<0>(p)))); EXPECT_EQ(24, Distance(p, Type<const Int128*>(L(5, 3, 1).Pointer<2>(p)))); EXPECT_EQ(8, Distance(p, Type<const int32_t*>(L(5, 3, 1).Pointer<1>(p)))); @@ -437,75 +450,78 @@ TEST(Layout, PointerByType) { alignas(max_align_t) const unsigned char p[100] = {}; { using L = Layout<int32_t>; - EXPECT_EQ(0, - Distance(p, Type<const int32_t*>(L::Partial().Pointer<int32_t>(p)))); - EXPECT_EQ(0, - Distance(p, Type<const int32_t*>(L::Partial(3).Pointer<int32_t>(p)))); + EXPECT_EQ( + 0, Distance(p, Type<const int32_t*>(L::Partial().Pointer<int32_t>(p)))); + EXPECT_EQ( + 0, + Distance(p, Type<const int32_t*>(L::Partial(3).Pointer<int32_t>(p)))); EXPECT_EQ(0, Distance(p, Type<const int32_t*>(L(3).Pointer<int32_t>(p)))); } { using L = Layout<int8_t, int32_t, Int128>; - EXPECT_EQ(0, Distance(p, Type<const int8_t*>(L::Partial().Pointer<int8_t>(p)))); - EXPECT_EQ(0, - Distance(p, Type<const int8_t*>(L::Partial(0).Pointer<int8_t>(p)))); - EXPECT_EQ(0, - Distance(p, Type<const int32_t*>(L::Partial(0).Pointer<int32_t>(p)))); - EXPECT_EQ(0, - Distance(p, Type<const int8_t*>(L::Partial(1).Pointer<int8_t>(p)))); - EXPECT_EQ(4, - Distance(p, Type<const int32_t*>(L::Partial(1).Pointer<int32_t>(p)))); - EXPECT_EQ(0, - Distance(p, Type<const int8_t*>(L::Partial(5).Pointer<int8_t>(p)))); - EXPECT_EQ(8, - Distance(p, Type<const int32_t*>(L::Partial(5).Pointer<int32_t>(p)))); EXPECT_EQ( - 0, Distance(p, Type<const int8_t*>(L::Partial(0, 0).Pointer<int8_t>(p)))); + 0, Distance(p, Type<const int8_t*>(L::Partial().Pointer<int8_t>(p)))); EXPECT_EQ( - 0, Distance(p, Type<const int32_t*>(L::Partial(0, 0).Pointer<int32_t>(p)))); + 0, Distance(p, Type<const int8_t*>(L::Partial(0).Pointer<int8_t>(p)))); EXPECT_EQ( 0, - Distance(p, Type<const Int128*>(L::Partial(0, 0).Pointer<Int128>(p)))); - EXPECT_EQ( - 0, Distance(p, Type<const int8_t*>(L::Partial(1, 0).Pointer<int8_t>(p)))); + Distance(p, Type<const int32_t*>(L::Partial(0).Pointer<int32_t>(p)))); EXPECT_EQ( - 4, Distance(p, Type<const int32_t*>(L::Partial(1, 0).Pointer<int32_t>(p)))); + 0, Distance(p, Type<const int8_t*>(L::Partial(1).Pointer<int8_t>(p)))); EXPECT_EQ( - 8, - Distance(p, Type<const Int128*>(L::Partial(1, 0).Pointer<Int128>(p)))); + 4, + Distance(p, Type<const int32_t*>(L::Partial(1).Pointer<int32_t>(p)))); EXPECT_EQ( - 0, Distance(p, Type<const int8_t*>(L::Partial(5, 3).Pointer<int8_t>(p)))); + 0, Distance(p, Type<const int8_t*>(L::Partial(5).Pointer<int8_t>(p)))); EXPECT_EQ( - 8, Distance(p, Type<const int32_t*>(L::Partial(5, 3).Pointer<int32_t>(p)))); + 8, + Distance(p, Type<const int32_t*>(L::Partial(5).Pointer<int32_t>(p)))); EXPECT_EQ( - 24, - Distance(p, Type<const Int128*>(L::Partial(5, 3).Pointer<Int128>(p)))); + 0, + Distance(p, Type<const int8_t*>(L::Partial(0, 0).Pointer<int8_t>(p)))); + EXPECT_EQ(0, Distance(p, Type<const int32_t*>( + L::Partial(0, 0).Pointer<int32_t>(p)))); EXPECT_EQ( 0, - Distance(p, Type<const int8_t*>(L::Partial(0, 0, 0).Pointer<int8_t>(p)))); + Distance(p, Type<const Int128*>(L::Partial(0, 0).Pointer<Int128>(p)))); EXPECT_EQ( 0, - Distance(p, Type<const int32_t*>(L::Partial(0, 0, 0).Pointer<int32_t>(p)))); - EXPECT_EQ(0, Distance(p, Type<const Int128*>( - L::Partial(0, 0, 0).Pointer<Int128>(p)))); + Distance(p, Type<const int8_t*>(L::Partial(1, 0).Pointer<int8_t>(p)))); + EXPECT_EQ(4, Distance(p, Type<const int32_t*>( + L::Partial(1, 0).Pointer<int32_t>(p)))); + EXPECT_EQ( + 8, + Distance(p, Type<const Int128*>(L::Partial(1, 0).Pointer<Int128>(p)))); EXPECT_EQ( 0, - Distance(p, Type<const int8_t*>(L::Partial(1, 0, 0).Pointer<int8_t>(p)))); + Distance(p, Type<const int8_t*>(L::Partial(5, 3).Pointer<int8_t>(p)))); + EXPECT_EQ(8, Distance(p, Type<const int32_t*>( + L::Partial(5, 3).Pointer<int32_t>(p)))); EXPECT_EQ( - 4, - Distance(p, Type<const int32_t*>(L::Partial(1, 0, 0).Pointer<int32_t>(p)))); + 24, + Distance(p, Type<const Int128*>(L::Partial(5, 3).Pointer<Int128>(p)))); + EXPECT_EQ(0, Distance(p, Type<const int8_t*>( + L::Partial(0, 0, 0).Pointer<int8_t>(p)))); + EXPECT_EQ(0, Distance(p, Type<const int32_t*>( + L::Partial(0, 0, 0).Pointer<int32_t>(p)))); + EXPECT_EQ(0, Distance(p, Type<const Int128*>( + L::Partial(0, 0, 0).Pointer<Int128>(p)))); + EXPECT_EQ(0, Distance(p, Type<const int8_t*>( + L::Partial(1, 0, 0).Pointer<int8_t>(p)))); + EXPECT_EQ(4, Distance(p, Type<const int32_t*>( + L::Partial(1, 0, 0).Pointer<int32_t>(p)))); EXPECT_EQ(8, Distance(p, Type<const Int128*>( L::Partial(1, 0, 0).Pointer<Int128>(p)))); - EXPECT_EQ( - 0, - Distance(p, Type<const int8_t*>(L::Partial(5, 3, 1).Pointer<int8_t>(p)))); + EXPECT_EQ(0, Distance(p, Type<const int8_t*>( + L::Partial(5, 3, 1).Pointer<int8_t>(p)))); EXPECT_EQ(24, Distance(p, Type<const Int128*>( L::Partial(5, 3, 1).Pointer<Int128>(p)))); - EXPECT_EQ( - 8, - Distance(p, Type<const int32_t*>(L::Partial(5, 3, 1).Pointer<int32_t>(p)))); + EXPECT_EQ(8, Distance(p, Type<const int32_t*>( + L::Partial(5, 3, 1).Pointer<int32_t>(p)))); EXPECT_EQ(24, Distance(p, Type<const Int128*>(L(5, 3, 1).Pointer<Int128>(p)))); - EXPECT_EQ(8, Distance(p, Type<const int32_t*>(L(5, 3, 1).Pointer<int32_t>(p)))); + EXPECT_EQ( + 8, Distance(p, Type<const int32_t*>(L(5, 3, 1).Pointer<int32_t>(p)))); } } @@ -546,15 +562,18 @@ TEST(Layout, MutablePointerByIndex) { EXPECT_EQ(8, Distance(p, Type<int32_t*>(L::Partial(5, 3).Pointer<1>(p)))); EXPECT_EQ(24, Distance(p, Type<Int128*>(L::Partial(5, 3).Pointer<2>(p)))); EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial(0, 0, 0).Pointer<0>(p)))); - EXPECT_EQ(0, Distance(p, Type<int32_t*>(L::Partial(0, 0, 0).Pointer<1>(p)))); + EXPECT_EQ(0, + Distance(p, Type<int32_t*>(L::Partial(0, 0, 0).Pointer<1>(p)))); EXPECT_EQ(0, Distance(p, Type<Int128*>(L::Partial(0, 0, 0).Pointer<2>(p)))); EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial(1, 0, 0).Pointer<0>(p)))); - EXPECT_EQ(4, Distance(p, Type<int32_t*>(L::Partial(1, 0, 0).Pointer<1>(p)))); + EXPECT_EQ(4, + Distance(p, Type<int32_t*>(L::Partial(1, 0, 0).Pointer<1>(p)))); EXPECT_EQ(8, Distance(p, Type<Int128*>(L::Partial(1, 0, 0).Pointer<2>(p)))); EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial(5, 3, 1).Pointer<0>(p)))); EXPECT_EQ(24, Distance(p, Type<Int128*>(L::Partial(5, 3, 1).Pointer<2>(p)))); - EXPECT_EQ(8, Distance(p, Type<int32_t*>(L::Partial(5, 3, 1).Pointer<1>(p)))); + EXPECT_EQ(8, + Distance(p, Type<int32_t*>(L::Partial(5, 3, 1).Pointer<1>(p)))); EXPECT_EQ(0, Distance(p, Type<int8_t*>(L(5, 3, 1).Pointer<0>(p)))); EXPECT_EQ(24, Distance(p, Type<Int128*>(L(5, 3, 1).Pointer<2>(p)))); EXPECT_EQ(8, Distance(p, Type<int32_t*>(L(5, 3, 1).Pointer<1>(p)))); @@ -566,48 +585,61 @@ TEST(Layout, MutablePointerByType) { { using L = Layout<int32_t>; EXPECT_EQ(0, Distance(p, Type<int32_t*>(L::Partial().Pointer<int32_t>(p)))); - EXPECT_EQ(0, Distance(p, Type<int32_t*>(L::Partial(3).Pointer<int32_t>(p)))); + EXPECT_EQ(0, + Distance(p, Type<int32_t*>(L::Partial(3).Pointer<int32_t>(p)))); EXPECT_EQ(0, Distance(p, Type<int32_t*>(L(3).Pointer<int32_t>(p)))); } { using L = Layout<int8_t, int32_t, Int128>; EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial().Pointer<int8_t>(p)))); EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial(0).Pointer<int8_t>(p)))); - EXPECT_EQ(0, Distance(p, Type<int32_t*>(L::Partial(0).Pointer<int32_t>(p)))); + EXPECT_EQ(0, + Distance(p, Type<int32_t*>(L::Partial(0).Pointer<int32_t>(p)))); EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial(1).Pointer<int8_t>(p)))); - EXPECT_EQ(4, Distance(p, Type<int32_t*>(L::Partial(1).Pointer<int32_t>(p)))); + EXPECT_EQ(4, + Distance(p, Type<int32_t*>(L::Partial(1).Pointer<int32_t>(p)))); EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial(5).Pointer<int8_t>(p)))); - EXPECT_EQ(8, Distance(p, Type<int32_t*>(L::Partial(5).Pointer<int32_t>(p)))); - EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial(0, 0).Pointer<int8_t>(p)))); - EXPECT_EQ(0, Distance(p, Type<int32_t*>(L::Partial(0, 0).Pointer<int32_t>(p)))); + EXPECT_EQ(8, + Distance(p, Type<int32_t*>(L::Partial(5).Pointer<int32_t>(p)))); + EXPECT_EQ(0, + Distance(p, Type<int8_t*>(L::Partial(0, 0).Pointer<int8_t>(p)))); + EXPECT_EQ( + 0, Distance(p, Type<int32_t*>(L::Partial(0, 0).Pointer<int32_t>(p)))); EXPECT_EQ(0, Distance(p, Type<Int128*>(L::Partial(0, 0).Pointer<Int128>(p)))); - EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial(1, 0).Pointer<int8_t>(p)))); - EXPECT_EQ(4, Distance(p, Type<int32_t*>(L::Partial(1, 0).Pointer<int32_t>(p)))); + EXPECT_EQ(0, + Distance(p, Type<int8_t*>(L::Partial(1, 0).Pointer<int8_t>(p)))); + EXPECT_EQ( + 4, Distance(p, Type<int32_t*>(L::Partial(1, 0).Pointer<int32_t>(p)))); EXPECT_EQ(8, Distance(p, Type<Int128*>(L::Partial(1, 0).Pointer<Int128>(p)))); - EXPECT_EQ(0, Distance(p, Type<int8_t*>(L::Partial(5, 3).Pointer<int8_t>(p)))); - EXPECT_EQ(8, Distance(p, Type<int32_t*>(L::Partial(5, 3).Pointer<int32_t>(p)))); + EXPECT_EQ(0, + Distance(p, Type<int8_t*>(L::Partial(5, 3).Pointer<int8_t>(p)))); + EXPECT_EQ( + 8, Distance(p, Type<int32_t*>(L::Partial(5, 3).Pointer<int32_t>(p)))); EXPECT_EQ(24, Distance(p, Type<Int128*>(L::Partial(5, 3).Pointer<Int128>(p)))); - EXPECT_EQ(0, - Distance(p, Type<int8_t*>(L::Partial(0, 0, 0).Pointer<int8_t>(p)))); - EXPECT_EQ(0, - Distance(p, Type<int32_t*>(L::Partial(0, 0, 0).Pointer<int32_t>(p)))); + EXPECT_EQ( + 0, Distance(p, Type<int8_t*>(L::Partial(0, 0, 0).Pointer<int8_t>(p)))); + EXPECT_EQ( + 0, + Distance(p, Type<int32_t*>(L::Partial(0, 0, 0).Pointer<int32_t>(p)))); EXPECT_EQ( 0, Distance(p, Type<Int128*>(L::Partial(0, 0, 0).Pointer<Int128>(p)))); - EXPECT_EQ(0, - Distance(p, Type<int8_t*>(L::Partial(1, 0, 0).Pointer<int8_t>(p)))); - EXPECT_EQ(4, - Distance(p, Type<int32_t*>(L::Partial(1, 0, 0).Pointer<int32_t>(p)))); + EXPECT_EQ( + 0, Distance(p, Type<int8_t*>(L::Partial(1, 0, 0).Pointer<int8_t>(p)))); + EXPECT_EQ( + 4, + Distance(p, Type<int32_t*>(L::Partial(1, 0, 0).Pointer<int32_t>(p)))); EXPECT_EQ( 8, Distance(p, Type<Int128*>(L::Partial(1, 0, 0).Pointer<Int128>(p)))); - EXPECT_EQ(0, - Distance(p, Type<int8_t*>(L::Partial(5, 3, 1).Pointer<int8_t>(p)))); + EXPECT_EQ( + 0, Distance(p, Type<int8_t*>(L::Partial(5, 3, 1).Pointer<int8_t>(p)))); EXPECT_EQ( 24, Distance(p, Type<Int128*>(L::Partial(5, 3, 1).Pointer<Int128>(p)))); - EXPECT_EQ(8, - Distance(p, Type<int32_t*>(L::Partial(5, 3, 1).Pointer<int32_t>(p)))); + EXPECT_EQ( + 8, + Distance(p, Type<int32_t*>(L::Partial(5, 3, 1).Pointer<int32_t>(p)))); EXPECT_EQ(0, Distance(p, Type<int8_t*>(L(5, 3, 1).Pointer<int8_t>(p)))); EXPECT_EQ(24, Distance(p, Type<Int128*>(L(5, 3, 1).Pointer<Int128>(p)))); EXPECT_EQ(8, Distance(p, Type<int32_t*>(L(5, 3, 1).Pointer<int32_t>(p)))); @@ -788,67 +820,72 @@ TEST(Layout, SliceByIndexData) { { using L = Layout<int32_t>; EXPECT_EQ( - 0, - Distance(p, Type<Span<const int32_t>>(L::Partial(0).Slice<0>(p)).data())); + 0, Distance( + p, Type<Span<const int32_t>>(L::Partial(0).Slice<0>(p)).data())); EXPECT_EQ( - 0, - Distance(p, Type<Span<const int32_t>>(L::Partial(3).Slice<0>(p)).data())); - EXPECT_EQ(0, Distance(p, Type<Span<const int32_t>>(L(3).Slice<0>(p)).data())); + 0, Distance( + p, Type<Span<const int32_t>>(L::Partial(3).Slice<0>(p)).data())); + EXPECT_EQ(0, + Distance(p, Type<Span<const int32_t>>(L(3).Slice<0>(p)).data())); } { using L = Layout<int32_t, int32_t>; EXPECT_EQ( - 0, - Distance(p, Type<Span<const int32_t>>(L::Partial(3).Slice<0>(p)).data())); + 0, Distance( + p, Type<Span<const int32_t>>(L::Partial(3).Slice<0>(p)).data())); EXPECT_EQ( 0, - Distance(p, - Type<Span<const int32_t>>(L::Partial(3, 5).Slice<0>(p)).data())); + Distance( + p, Type<Span<const int32_t>>(L::Partial(3, 5).Slice<0>(p)).data())); EXPECT_EQ( 12, - Distance(p, - Type<Span<const int32_t>>(L::Partial(3, 5).Slice<1>(p)).data())); - EXPECT_EQ(0, - Distance(p, Type<Span<const int32_t>>(L(3, 5).Slice<0>(p)).data())); - EXPECT_EQ(12, - Distance(p, Type<Span<const int32_t>>(L(3, 5).Slice<1>(p)).data())); + Distance( + p, Type<Span<const int32_t>>(L::Partial(3, 5).Slice<1>(p)).data())); + EXPECT_EQ( + 0, Distance(p, Type<Span<const int32_t>>(L(3, 5).Slice<0>(p)).data())); + EXPECT_EQ( + 12, Distance(p, Type<Span<const int32_t>>(L(3, 5).Slice<1>(p)).data())); } { using L = Layout<int8_t, int32_t, Int128>; EXPECT_EQ( - 0, - Distance(p, Type<Span<const int8_t>>(L::Partial(0).Slice<0>(p)).data())); - EXPECT_EQ( - 0, - Distance(p, Type<Span<const int8_t>>(L::Partial(1).Slice<0>(p)).data())); + 0, Distance( + p, Type<Span<const int8_t>>(L::Partial(0).Slice<0>(p)).data())); EXPECT_EQ( - 0, - Distance(p, Type<Span<const int8_t>>(L::Partial(5).Slice<0>(p)).data())); + 0, Distance( + p, Type<Span<const int8_t>>(L::Partial(1).Slice<0>(p)).data())); EXPECT_EQ( 0, Distance( - p, Type<Span<const int8_t>>(L::Partial(0, 0).Slice<0>(p)).data())); + p, Type<Span<const int8_t>>(L::Partial(5).Slice<0>(p)).data())); EXPECT_EQ( 0, - Distance(p, - Type<Span<const int32_t>>(L::Partial(0, 0).Slice<1>(p)).data())); + Distance( + p, Type<Span<const int8_t>>(L::Partial(0, 0).Slice<0>(p)).data())); EXPECT_EQ( - 0, Distance( - p, Type<Span<const int8_t>>(L::Partial(1, 0).Slice<0>(p)).data())); + 0, + Distance( + p, Type<Span<const int32_t>>(L::Partial(0, 0).Slice<1>(p)).data())); + EXPECT_EQ( + 0, + Distance( + p, Type<Span<const int8_t>>(L::Partial(1, 0).Slice<0>(p)).data())); EXPECT_EQ( 4, - Distance(p, - Type<Span<const int32_t>>(L::Partial(1, 0).Slice<1>(p)).data())); + Distance( + p, Type<Span<const int32_t>>(L::Partial(1, 0).Slice<1>(p)).data())); EXPECT_EQ( - 0, Distance( - p, Type<Span<const int8_t>>(L::Partial(5, 3).Slice<0>(p)).data())); + 0, + Distance( + p, Type<Span<const int8_t>>(L::Partial(5, 3).Slice<0>(p)).data())); EXPECT_EQ( 8, - Distance(p, - Type<Span<const int32_t>>(L::Partial(5, 3).Slice<1>(p)).data())); + Distance( + p, Type<Span<const int32_t>>(L::Partial(5, 3).Slice<1>(p)).data())); EXPECT_EQ( 0, Distance( - p, Type<Span<const int8_t>>(L::Partial(0, 0, 0).Slice<0>(p)).data())); + p, + Type<Span<const int8_t>>(L::Partial(0, 0, 0).Slice<0>(p)).data())); EXPECT_EQ( 0, Distance( @@ -862,7 +899,8 @@ TEST(Layout, SliceByIndexData) { EXPECT_EQ( 0, Distance( - p, Type<Span<const int8_t>>(L::Partial(1, 0, 0).Slice<0>(p)).data())); + p, + Type<Span<const int8_t>>(L::Partial(1, 0, 0).Slice<0>(p)).data())); EXPECT_EQ( 4, Distance( @@ -876,7 +914,8 @@ TEST(Layout, SliceByIndexData) { EXPECT_EQ( 0, Distance( - p, Type<Span<const int8_t>>(L::Partial(5, 3, 1).Slice<0>(p)).data())); + p, + Type<Span<const int8_t>>(L::Partial(5, 3, 1).Slice<0>(p)).data())); EXPECT_EQ( 24, Distance( @@ -888,12 +927,14 @@ TEST(Layout, SliceByIndexData) { p, Type<Span<const int32_t>>(L::Partial(5, 3, 1).Slice<1>(p)).data())); EXPECT_EQ( - 0, Distance(p, Type<Span<const int8_t>>(L(5, 3, 1).Slice<0>(p)).data())); + 0, + Distance(p, Type<Span<const int8_t>>(L(5, 3, 1).Slice<0>(p)).data())); EXPECT_EQ( 24, Distance(p, Type<Span<const Int128>>(L(5, 3, 1).Slice<2>(p)).data())); EXPECT_EQ( - 8, Distance(p, Type<Span<const int32_t>>(L(5, 3, 1).Slice<1>(p)).data())); + 8, + Distance(p, Type<Span<const int32_t>>(L(5, 3, 1).Slice<1>(p)).data())); } } @@ -904,98 +945,94 @@ TEST(Layout, SliceByTypeData) { EXPECT_EQ( 0, Distance( - p, Type<Span<const int32_t>>(L::Partial(0).Slice<int32_t>(p)).data())); + p, + Type<Span<const int32_t>>(L::Partial(0).Slice<int32_t>(p)).data())); EXPECT_EQ( 0, Distance( - p, Type<Span<const int32_t>>(L::Partial(3).Slice<int32_t>(p)).data())); + p, + Type<Span<const int32_t>>(L::Partial(3).Slice<int32_t>(p)).data())); EXPECT_EQ( - 0, Distance(p, Type<Span<const int32_t>>(L(3).Slice<int32_t>(p)).data())); + 0, + Distance(p, Type<Span<const int32_t>>(L(3).Slice<int32_t>(p)).data())); } { using L = Layout<int8_t, int32_t, Int128>; EXPECT_EQ( - 0, Distance( - p, Type<Span<const int8_t>>(L::Partial(0).Slice<int8_t>(p)).data())); - EXPECT_EQ( - 0, Distance( - p, Type<Span<const int8_t>>(L::Partial(1).Slice<int8_t>(p)).data())); - EXPECT_EQ( - 0, Distance( - p, Type<Span<const int8_t>>(L::Partial(5).Slice<int8_t>(p)).data())); - EXPECT_EQ( - 0, - Distance( - p, Type<Span<const int8_t>>(L::Partial(0, 0).Slice<int8_t>(p)).data())); - EXPECT_EQ( 0, Distance( p, - Type<Span<const int32_t>>(L::Partial(0, 0).Slice<int32_t>(p)).data())); + Type<Span<const int8_t>>(L::Partial(0).Slice<int8_t>(p)).data())); EXPECT_EQ( 0, Distance( - p, Type<Span<const int8_t>>(L::Partial(1, 0).Slice<int8_t>(p)).data())); - EXPECT_EQ( - 4, - Distance( p, - Type<Span<const int32_t>>(L::Partial(1, 0).Slice<int32_t>(p)).data())); + Type<Span<const int8_t>>(L::Partial(1).Slice<int8_t>(p)).data())); EXPECT_EQ( 0, Distance( - p, Type<Span<const int8_t>>(L::Partial(5, 3).Slice<int8_t>(p)).data())); - EXPECT_EQ( - 8, - Distance( p, - Type<Span<const int32_t>>(L::Partial(5, 3).Slice<int32_t>(p)).data())); + Type<Span<const int8_t>>(L::Partial(5).Slice<int8_t>(p)).data())); EXPECT_EQ( 0, - Distance( - p, - Type<Span<const int8_t>>(L::Partial(0, 0, 0).Slice<int8_t>(p)).data())); + Distance(p, Type<Span<const int8_t>>(L::Partial(0, 0).Slice<int8_t>(p)) + .data())); + EXPECT_EQ(0, Distance(p, Type<Span<const int32_t>>( + L::Partial(0, 0).Slice<int32_t>(p)) + .data())); EXPECT_EQ( 0, - Distance(p, Type<Span<const int32_t>>(L::Partial(0, 0, 0).Slice<int32_t>(p)) + Distance(p, Type<Span<const int8_t>>(L::Partial(1, 0).Slice<int8_t>(p)) .data())); - EXPECT_EQ(0, Distance(p, Type<Span<const Int128>>( - L::Partial(0, 0, 0).Slice<Int128>(p)) + EXPECT_EQ(4, Distance(p, Type<Span<const int32_t>>( + L::Partial(1, 0).Slice<int32_t>(p)) .data())); EXPECT_EQ( 0, - Distance( - p, - Type<Span<const int8_t>>(L::Partial(1, 0, 0).Slice<int8_t>(p)).data())); - EXPECT_EQ( - 4, - Distance(p, Type<Span<const int32_t>>(L::Partial(1, 0, 0).Slice<int32_t>(p)) + Distance(p, Type<Span<const int8_t>>(L::Partial(5, 3).Slice<int8_t>(p)) .data())); + EXPECT_EQ(8, Distance(p, Type<Span<const int32_t>>( + L::Partial(5, 3).Slice<int32_t>(p)) + .data())); + EXPECT_EQ(0, Distance(p, Type<Span<const int8_t>>( + L::Partial(0, 0, 0).Slice<int8_t>(p)) + .data())); + EXPECT_EQ(0, Distance(p, Type<Span<const int32_t>>( + L::Partial(0, 0, 0).Slice<int32_t>(p)) + .data())); + EXPECT_EQ(0, Distance(p, Type<Span<const Int128>>( + L::Partial(0, 0, 0).Slice<Int128>(p)) + .data())); + EXPECT_EQ(0, Distance(p, Type<Span<const int8_t>>( + L::Partial(1, 0, 0).Slice<int8_t>(p)) + .data())); + EXPECT_EQ(4, Distance(p, Type<Span<const int32_t>>( + L::Partial(1, 0, 0).Slice<int32_t>(p)) + .data())); EXPECT_EQ(8, Distance(p, Type<Span<const Int128>>( L::Partial(1, 0, 0).Slice<Int128>(p)) .data())); - EXPECT_EQ( - 0, - Distance( - p, - Type<Span<const int8_t>>(L::Partial(5, 3, 1).Slice<int8_t>(p)).data())); + EXPECT_EQ(0, Distance(p, Type<Span<const int8_t>>( + L::Partial(5, 3, 1).Slice<int8_t>(p)) + .data())); EXPECT_EQ(24, Distance(p, Type<Span<const Int128>>( L::Partial(5, 3, 1).Slice<Int128>(p)) .data())); - EXPECT_EQ( - 8, - Distance(p, Type<Span<const int32_t>>(L::Partial(5, 3, 1).Slice<int32_t>(p)) - .data())); + EXPECT_EQ(8, Distance(p, Type<Span<const int32_t>>( + L::Partial(5, 3, 1).Slice<int32_t>(p)) + .data())); EXPECT_EQ( 0, - Distance(p, Type<Span<const int8_t>>(L(5, 3, 1).Slice<int8_t>(p)).data())); + Distance(p, + Type<Span<const int8_t>>(L(5, 3, 1).Slice<int8_t>(p)).data())); EXPECT_EQ( 24, Distance(p, Type<Span<const Int128>>(L(5, 3, 1).Slice<Int128>(p)).data())); EXPECT_EQ( - 8, Distance( - p, Type<Span<const int32_t>>(L(5, 3, 1).Slice<int32_t>(p)).data())); + 8, + Distance( + p, Type<Span<const int32_t>>(L(5, 3, 1).Slice<int32_t>(p)).data())); } } @@ -1003,18 +1040,19 @@ TEST(Layout, MutableSliceByIndexData) { alignas(max_align_t) unsigned char p[100]; { using L = Layout<int32_t>; - EXPECT_EQ(0, - Distance(p, Type<Span<int32_t>>(L::Partial(0).Slice<0>(p)).data())); - EXPECT_EQ(0, - Distance(p, Type<Span<int32_t>>(L::Partial(3).Slice<0>(p)).data())); + EXPECT_EQ( + 0, Distance(p, Type<Span<int32_t>>(L::Partial(0).Slice<0>(p)).data())); + EXPECT_EQ( + 0, Distance(p, Type<Span<int32_t>>(L::Partial(3).Slice<0>(p)).data())); EXPECT_EQ(0, Distance(p, Type<Span<int32_t>>(L(3).Slice<0>(p)).data())); } { using L = Layout<int32_t, int32_t>; - EXPECT_EQ(0, - Distance(p, Type<Span<int32_t>>(L::Partial(3).Slice<0>(p)).data())); EXPECT_EQ( - 0, Distance(p, Type<Span<int32_t>>(L::Partial(3, 5).Slice<0>(p)).data())); + 0, Distance(p, Type<Span<int32_t>>(L::Partial(3).Slice<0>(p)).data())); + EXPECT_EQ( + 0, + Distance(p, Type<Span<int32_t>>(L::Partial(3, 5).Slice<0>(p)).data())); EXPECT_EQ( 12, Distance(p, Type<Span<int32_t>>(L::Partial(3, 5).Slice<1>(p)).data())); @@ -1023,55 +1061,63 @@ TEST(Layout, MutableSliceByIndexData) { } { using L = Layout<int8_t, int32_t, Int128>; - EXPECT_EQ(0, - Distance(p, Type<Span<int8_t>>(L::Partial(0).Slice<0>(p)).data())); - EXPECT_EQ(0, - Distance(p, Type<Span<int8_t>>(L::Partial(1).Slice<0>(p)).data())); - EXPECT_EQ(0, - Distance(p, Type<Span<int8_t>>(L::Partial(5).Slice<0>(p)).data())); - EXPECT_EQ( - 0, Distance(p, Type<Span<int8_t>>(L::Partial(0, 0).Slice<0>(p)).data())); EXPECT_EQ( - 0, Distance(p, Type<Span<int32_t>>(L::Partial(0, 0).Slice<1>(p)).data())); + 0, Distance(p, Type<Span<int8_t>>(L::Partial(0).Slice<0>(p)).data())); EXPECT_EQ( - 0, Distance(p, Type<Span<int8_t>>(L::Partial(1, 0).Slice<0>(p)).data())); + 0, Distance(p, Type<Span<int8_t>>(L::Partial(1).Slice<0>(p)).data())); EXPECT_EQ( - 4, Distance(p, Type<Span<int32_t>>(L::Partial(1, 0).Slice<1>(p)).data())); + 0, Distance(p, Type<Span<int8_t>>(L::Partial(5).Slice<0>(p)).data())); EXPECT_EQ( - 0, Distance(p, Type<Span<int8_t>>(L::Partial(5, 3).Slice<0>(p)).data())); + 0, + Distance(p, Type<Span<int8_t>>(L::Partial(0, 0).Slice<0>(p)).data())); EXPECT_EQ( - 8, Distance(p, Type<Span<int32_t>>(L::Partial(5, 3).Slice<1>(p)).data())); + 0, + Distance(p, Type<Span<int32_t>>(L::Partial(0, 0).Slice<1>(p)).data())); EXPECT_EQ( 0, - Distance(p, Type<Span<int8_t>>(L::Partial(0, 0, 0).Slice<0>(p)).data())); + Distance(p, Type<Span<int8_t>>(L::Partial(1, 0).Slice<0>(p)).data())); + EXPECT_EQ( + 4, + Distance(p, Type<Span<int32_t>>(L::Partial(1, 0).Slice<1>(p)).data())); EXPECT_EQ( 0, - Distance(p, Type<Span<int32_t>>(L::Partial(0, 0, 0).Slice<1>(p)).data())); + Distance(p, Type<Span<int8_t>>(L::Partial(5, 3).Slice<0>(p)).data())); + EXPECT_EQ( + 8, + Distance(p, Type<Span<int32_t>>(L::Partial(5, 3).Slice<1>(p)).data())); + EXPECT_EQ( + 0, Distance( + p, Type<Span<int8_t>>(L::Partial(0, 0, 0).Slice<0>(p)).data())); + EXPECT_EQ( + 0, Distance( + p, Type<Span<int32_t>>(L::Partial(0, 0, 0).Slice<1>(p)).data())); EXPECT_EQ( 0, Distance( p, Type<Span<Int128>>(L::Partial(0, 0, 0).Slice<2>(p)).data())); EXPECT_EQ( - 0, - Distance(p, Type<Span<int8_t>>(L::Partial(1, 0, 0).Slice<0>(p)).data())); + 0, Distance( + p, Type<Span<int8_t>>(L::Partial(1, 0, 0).Slice<0>(p)).data())); EXPECT_EQ( - 4, - Distance(p, Type<Span<int32_t>>(L::Partial(1, 0, 0).Slice<1>(p)).data())); + 4, Distance( + p, Type<Span<int32_t>>(L::Partial(1, 0, 0).Slice<1>(p)).data())); EXPECT_EQ( 8, Distance( p, Type<Span<Int128>>(L::Partial(1, 0, 0).Slice<2>(p)).data())); EXPECT_EQ( - 0, - Distance(p, Type<Span<int8_t>>(L::Partial(5, 3, 1).Slice<0>(p)).data())); + 0, Distance( + p, Type<Span<int8_t>>(L::Partial(5, 3, 1).Slice<0>(p)).data())); EXPECT_EQ( 24, Distance( p, Type<Span<Int128>>(L::Partial(5, 3, 1).Slice<2>(p)).data())); EXPECT_EQ( - 8, - Distance(p, Type<Span<int32_t>>(L::Partial(5, 3, 1).Slice<1>(p)).data())); - EXPECT_EQ(0, Distance(p, Type<Span<int8_t>>(L(5, 3, 1).Slice<0>(p)).data())); + 8, Distance( + p, Type<Span<int32_t>>(L::Partial(5, 3, 1).Slice<1>(p)).data())); + EXPECT_EQ(0, + Distance(p, Type<Span<int8_t>>(L(5, 3, 1).Slice<0>(p)).data())); EXPECT_EQ(24, Distance(p, Type<Span<Int128>>(L(5, 3, 1).Slice<2>(p)).data())); - EXPECT_EQ(8, Distance(p, Type<Span<int32_t>>(L(5, 3, 1).Slice<1>(p)).data())); + EXPECT_EQ(8, + Distance(p, Type<Span<int32_t>>(L(5, 3, 1).Slice<1>(p)).data())); } } @@ -1080,66 +1126,84 @@ TEST(Layout, MutableSliceByTypeData) { { using L = Layout<int32_t>; EXPECT_EQ( - 0, - Distance(p, Type<Span<int32_t>>(L::Partial(0).Slice<int32_t>(p)).data())); + 0, Distance( + p, Type<Span<int32_t>>(L::Partial(0).Slice<int32_t>(p)).data())); EXPECT_EQ( - 0, - Distance(p, Type<Span<int32_t>>(L::Partial(3).Slice<int32_t>(p)).data())); - EXPECT_EQ(0, Distance(p, Type<Span<int32_t>>(L(3).Slice<int32_t>(p)).data())); + 0, Distance( + p, Type<Span<int32_t>>(L::Partial(3).Slice<int32_t>(p)).data())); + EXPECT_EQ(0, + Distance(p, Type<Span<int32_t>>(L(3).Slice<int32_t>(p)).data())); } { using L = Layout<int8_t, int32_t, Int128>; EXPECT_EQ( - 0, Distance(p, Type<Span<int8_t>>(L::Partial(0).Slice<int8_t>(p)).data())); + 0, + Distance(p, Type<Span<int8_t>>(L::Partial(0).Slice<int8_t>(p)).data())); EXPECT_EQ( - 0, Distance(p, Type<Span<int8_t>>(L::Partial(1).Slice<int8_t>(p)).data())); + 0, + Distance(p, Type<Span<int8_t>>(L::Partial(1).Slice<int8_t>(p)).data())); EXPECT_EQ( - 0, Distance(p, Type<Span<int8_t>>(L::Partial(5).Slice<int8_t>(p)).data())); + 0, + Distance(p, Type<Span<int8_t>>(L::Partial(5).Slice<int8_t>(p)).data())); EXPECT_EQ( 0, - Distance(p, Type<Span<int8_t>>(L::Partial(0, 0).Slice<int8_t>(p)).data())); + Distance(p, + Type<Span<int8_t>>(L::Partial(0, 0).Slice<int8_t>(p)).data())); EXPECT_EQ( - 0, Distance( - p, Type<Span<int32_t>>(L::Partial(0, 0).Slice<int32_t>(p)).data())); + 0, + Distance( + p, Type<Span<int32_t>>(L::Partial(0, 0).Slice<int32_t>(p)).data())); EXPECT_EQ( 0, - Distance(p, Type<Span<int8_t>>(L::Partial(1, 0).Slice<int8_t>(p)).data())); + Distance(p, + Type<Span<int8_t>>(L::Partial(1, 0).Slice<int8_t>(p)).data())); EXPECT_EQ( - 4, Distance( - p, Type<Span<int32_t>>(L::Partial(1, 0).Slice<int32_t>(p)).data())); + 4, + Distance( + p, Type<Span<int32_t>>(L::Partial(1, 0).Slice<int32_t>(p)).data())); EXPECT_EQ( 0, - Distance(p, Type<Span<int8_t>>(L::Partial(5, 3).Slice<int8_t>(p)).data())); + Distance(p, + Type<Span<int8_t>>(L::Partial(5, 3).Slice<int8_t>(p)).data())); EXPECT_EQ( - 8, Distance( - p, Type<Span<int32_t>>(L::Partial(5, 3).Slice<int32_t>(p)).data())); + 8, + Distance( + p, Type<Span<int32_t>>(L::Partial(5, 3).Slice<int32_t>(p)).data())); EXPECT_EQ( - 0, Distance( - p, Type<Span<int8_t>>(L::Partial(0, 0, 0).Slice<int8_t>(p)).data())); + 0, + Distance( + p, + Type<Span<int8_t>>(L::Partial(0, 0, 0).Slice<int8_t>(p)).data())); EXPECT_EQ( 0, Distance( - p, Type<Span<int32_t>>(L::Partial(0, 0, 0).Slice<int32_t>(p)).data())); + p, + Type<Span<int32_t>>(L::Partial(0, 0, 0).Slice<int32_t>(p)).data())); EXPECT_EQ( 0, Distance( p, Type<Span<Int128>>(L::Partial(0, 0, 0).Slice<Int128>(p)).data())); EXPECT_EQ( - 0, Distance( - p, Type<Span<int8_t>>(L::Partial(1, 0, 0).Slice<int8_t>(p)).data())); + 0, + Distance( + p, + Type<Span<int8_t>>(L::Partial(1, 0, 0).Slice<int8_t>(p)).data())); EXPECT_EQ( 4, Distance( - p, Type<Span<int32_t>>(L::Partial(1, 0, 0).Slice<int32_t>(p)).data())); + p, + Type<Span<int32_t>>(L::Partial(1, 0, 0).Slice<int32_t>(p)).data())); EXPECT_EQ( 8, Distance( p, Type<Span<Int128>>(L::Partial(1, 0, 0).Slice<Int128>(p)).data())); EXPECT_EQ( - 0, Distance( - p, Type<Span<int8_t>>(L::Partial(5, 3, 1).Slice<int8_t>(p)).data())); + 0, + Distance( + p, + Type<Span<int8_t>>(L::Partial(5, 3, 1).Slice<int8_t>(p)).data())); EXPECT_EQ( 24, Distance( @@ -1148,14 +1212,16 @@ TEST(Layout, MutableSliceByTypeData) { EXPECT_EQ( 8, Distance( - p, Type<Span<int32_t>>(L::Partial(5, 3, 1).Slice<int32_t>(p)).data())); - EXPECT_EQ(0, - Distance(p, Type<Span<int8_t>>(L(5, 3, 1).Slice<int8_t>(p)).data())); + p, + Type<Span<int32_t>>(L::Partial(5, 3, 1).Slice<int32_t>(p)).data())); + EXPECT_EQ( + 0, Distance(p, Type<Span<int8_t>>(L(5, 3, 1).Slice<int8_t>(p)).data())); EXPECT_EQ( 24, Distance(p, Type<Span<Int128>>(L(5, 3, 1).Slice<Int128>(p)).data())); EXPECT_EQ( - 8, Distance(p, Type<Span<int32_t>>(L(5, 3, 1).Slice<int32_t>(p)).data())); + 8, + Distance(p, Type<Span<int32_t>>(L(5, 3, 1).Slice<int32_t>(p)).data())); } } @@ -1254,17 +1320,17 @@ TEST(Layout, MutableSlices) { } { const auto x = L::Partial(1, 2, 3); - EXPECT_THAT( - (Type<std::tuple<Span<int8_t>, Span<int8_t>, Span<Int128>>>(x.Slices(p))), - Tuple(IsSameSlice(x.Slice<0>(p)), IsSameSlice(x.Slice<1>(p)), - IsSameSlice(x.Slice<2>(p)))); + EXPECT_THAT((Type<std::tuple<Span<int8_t>, Span<int8_t>, Span<Int128>>>( + x.Slices(p))), + Tuple(IsSameSlice(x.Slice<0>(p)), IsSameSlice(x.Slice<1>(p)), + IsSameSlice(x.Slice<2>(p)))); } { const L x(1, 2, 3); - EXPECT_THAT( - (Type<std::tuple<Span<int8_t>, Span<int8_t>, Span<Int128>>>(x.Slices(p))), - Tuple(IsSameSlice(x.Slice<0>(p)), IsSameSlice(x.Slice<1>(p)), - IsSameSlice(x.Slice<2>(p)))); + EXPECT_THAT((Type<std::tuple<Span<int8_t>, Span<int8_t>, Span<Int128>>>( + x.Slices(p))), + Tuple(IsSameSlice(x.Slice<0>(p)), IsSameSlice(x.Slice<1>(p)), + IsSameSlice(x.Slice<2>(p)))); } } @@ -1284,7 +1350,13 @@ TEST(Layout, CustomAlignment) { TEST(Layout, OverAligned) { constexpr size_t M = alignof(max_align_t); constexpr Layout<unsigned char, Aligned<unsigned char, 2 * M>> x(1, 3); +#ifdef __GNUC__ + // Using __attribute__ ((aligned ())) instead of alignas to bypass a gcc bug: + // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89357 + __attribute__((aligned(2 * M))) unsigned char p[x.AllocSize()]; +#else alignas(2 * M) unsigned char p[x.AllocSize()]; +#endif EXPECT_EQ(2 * M + 3, x.AllocSize()); EXPECT_THAT(x.Pointers(p), Tuple(p + 0, p + 2 * M)); } @@ -1314,7 +1386,7 @@ struct Region { }; void ExpectRegionPoisoned(const unsigned char* p, size_t n, bool poisoned) { -#ifdef ADDRESS_SANITIZER +#ifdef ABSL_HAVE_ADDRESS_SANITIZER for (size_t i = 0; i != n; ++i) { EXPECT_EQ(poisoned, __asan_address_is_poisoned(p + i)); } @@ -1396,7 +1468,8 @@ TEST(Layout, DebugString) { x.DebugString()); } { - constexpr auto x = Layout<int8_t, int32_t, int8_t, Int128>::Partial(1, 2, 3); + constexpr auto x = + Layout<int8_t, int32_t, int8_t, Int128>::Partial(1, 2, 3); EXPECT_EQ( "@0<signed char>(1)[1]; @4<int>(4)[2]; @12<signed char>(1)[3]; " "@16" + @@ -1404,7 +1477,8 @@ TEST(Layout, DebugString) { x.DebugString()); } { - constexpr auto x = Layout<int8_t, int32_t, int8_t, Int128>::Partial(1, 2, 3, 4); + constexpr auto x = + Layout<int8_t, int32_t, int8_t, Int128>::Partial(1, 2, 3, 4); EXPECT_EQ( "@0<signed char>(1)[1]; @4<int>(4)[2]; @12<signed char>(1)[3]; " "@16" + diff --git a/third_party/abseil-cpp/absl/container/internal/raw_hash_map.h b/third_party/abseil-cpp/absl/container/internal/raw_hash_map.h index 0a02757ddf..c7df2efc62 100644 --- a/third_party/abseil-cpp/absl/container/internal/raw_hash_map.h +++ b/third_party/abseil-cpp/absl/container/internal/raw_hash_map.h @@ -51,8 +51,9 @@ class raw_hash_map : public raw_hash_set<Policy, Hash, Eq, Alloc> { using key_arg = typename KeyArgImpl::template type<K, key_type>; static_assert(!std::is_reference<key_type>::value, ""); - // TODO(alkis): remove this assertion and verify that reference mapped_type is - // supported. + + // TODO(b/187807849): Evaluate whether to support reference mapped_type and + // remove this assertion if/when it is supported. static_assert(!std::is_reference<mapped_type>::value, ""); using iterator = typename raw_hash_map::raw_hash_set::iterator; diff --git a/third_party/abseil-cpp/absl/container/internal/raw_hash_set.cc b/third_party/abseil-cpp/absl/container/internal/raw_hash_set.cc index 919ac07405..687bcb8a4d 100644 --- a/third_party/abseil-cpp/absl/container/internal/raw_hash_set.cc +++ b/third_party/abseil-cpp/absl/container/internal/raw_hash_set.cc @@ -23,11 +23,17 @@ namespace absl { ABSL_NAMESPACE_BEGIN namespace container_internal { +alignas(16) ABSL_CONST_INIT ABSL_DLL const ctrl_t kEmptyGroup[16] = { + ctrl_t::kSentinel, ctrl_t::kEmpty, ctrl_t::kEmpty, ctrl_t::kEmpty, + ctrl_t::kEmpty, ctrl_t::kEmpty, ctrl_t::kEmpty, ctrl_t::kEmpty, + ctrl_t::kEmpty, ctrl_t::kEmpty, ctrl_t::kEmpty, ctrl_t::kEmpty, + ctrl_t::kEmpty, ctrl_t::kEmpty, ctrl_t::kEmpty, ctrl_t::kEmpty}; + constexpr size_t Group::kWidth; // Returns "random" seed. inline size_t RandomSeed() { -#if ABSL_HAVE_THREAD_LOCAL +#ifdef ABSL_HAVE_THREAD_LOCAL static thread_local size_t counter = 0; size_t value = ++counter; #else // ABSL_HAVE_THREAD_LOCAL @@ -37,12 +43,25 @@ inline size_t RandomSeed() { return value ^ static_cast<size_t>(reinterpret_cast<uintptr_t>(&counter)); } -bool ShouldInsertBackwards(size_t hash, ctrl_t* ctrl) { +bool ShouldInsertBackwards(size_t hash, const ctrl_t* ctrl) { // To avoid problems with weak hashes and single bit tests, we use % 13. // TODO(kfm,sbenza): revisit after we do unconditional mixing return (H1(hash, ctrl) ^ RandomSeed()) % 13 > 6; } +void ConvertDeletedToEmptyAndFullToDeleted(ctrl_t* ctrl, size_t capacity) { + assert(ctrl[capacity] == ctrl_t::kSentinel); + assert(IsValidCapacity(capacity)); + for (ctrl_t* pos = ctrl; pos < ctrl + capacity; pos += Group::kWidth) { + Group{pos}.ConvertSpecialToEmptyAndFullToDeleted(pos); + } + // Copy the cloned ctrl bytes. + std::memcpy(ctrl + capacity + 1, ctrl, NumClonedBytes()); + ctrl[capacity] = ctrl_t::kSentinel; +} +// Extern template instantiotion for inline function. +template FindInfo find_first_non_full(const ctrl_t*, size_t, size_t); + } // namespace container_internal ABSL_NAMESPACE_END } // namespace absl diff --git a/third_party/abseil-cpp/absl/container/internal/raw_hash_set.h b/third_party/abseil-cpp/absl/container/internal/raw_hash_set.h index ca7be8d868..12682b3532 100644 --- a/third_party/abseil-cpp/absl/container/internal/raw_hash_set.h +++ b/third_party/abseil-cpp/absl/container/internal/raw_hash_set.h @@ -87,6 +87,17 @@ // // This probing function guarantees that after N probes, all the groups of the // table will be probed exactly once. +// +// The control state and slot array are stored contiguously in a shared heap +// allocation. The layout of this allocation is: `capacity()` control bytes, +// one sentinel control byte, `Group::kWidth - 1` cloned control bytes, +// <possible padding>, `capacity()` slots. The sentinel control byte is used in +// iteration so we know when we reach the end of the table. The cloned control +// bytes at the end of the table are cloned from the beginning of the table so +// groups that begin near the end of the table can see a full group. In cases in +// which there are more than `capacity()` cloned control bytes, the extra bytes +// are `kEmpty`, and these ensure that we always see at least one empty slot and +// can stop an unsuccessful search. #ifndef ABSL_CONTAINER_INTERNAL_RAW_HASH_SET_H_ #define ABSL_CONTAINER_INTERNAL_RAW_HASH_SET_H_ @@ -102,8 +113,8 @@ #include <type_traits> #include <utility> -#include "absl/base/internal/bits.h" #include "absl/base/internal/endian.h" +#include "absl/base/optimization.h" #include "absl/base/port.h" #include "absl/container/internal/common.h" #include "absl/container/internal/compressed_tuple.h" @@ -112,15 +123,25 @@ #include "absl/container/internal/hashtable_debug_hooks.h" #include "absl/container/internal/hashtablez_sampler.h" #include "absl/container/internal/have_sse.h" -#include "absl/container/internal/layout.h" #include "absl/memory/memory.h" #include "absl/meta/type_traits.h" +#include "absl/numeric/bits.h" #include "absl/utility/utility.h" namespace absl { ABSL_NAMESPACE_BEGIN namespace container_internal { +template <typename AllocType> +void SwapAlloc(AllocType& lhs, AllocType& rhs, + std::true_type /* propagate_on_container_swap */) { + using std::swap; + swap(lhs, rhs); +} +template <typename AllocType> +void SwapAlloc(AllocType& /*lhs*/, AllocType& /*rhs*/, + std::false_type /* propagate_on_container_swap */) {} + template <size_t Width> class probe_seq { public: @@ -168,24 +189,19 @@ struct IsDecomposable< // TODO(alkis): Switch to std::is_nothrow_swappable when gcc/clang supports it. template <class T> -constexpr bool IsNoThrowSwappable() { +constexpr bool IsNoThrowSwappable(std::true_type = {} /* is_swappable */) { using std::swap; return noexcept(swap(std::declval<T&>(), std::declval<T&>())); } - -template <typename T> -int TrailingZeros(T x) { - return sizeof(T) == 8 ? base_internal::CountTrailingZerosNonZero64( - static_cast<uint64_t>(x)) - : base_internal::CountTrailingZerosNonZero32( - static_cast<uint32_t>(x)); +template <class T> +constexpr bool IsNoThrowSwappable(std::false_type /* is_swappable */) { + return false; } template <typename T> -int LeadingZeros(T x) { - return sizeof(T) == 8 - ? base_internal::CountLeadingZeros64(static_cast<uint64_t>(x)) - : base_internal::CountLeadingZeros32(static_cast<uint32_t>(x)); +uint32_t TrailingZeros(T x) { + ABSL_INTERNAL_ASSUME(x != 0); + return countr_zero(x); } // An abstraction over a bitmask. It provides an easy way to iterate through the @@ -215,26 +231,24 @@ class BitMask { } explicit operator bool() const { return mask_ != 0; } int operator*() const { return LowestBitSet(); } - int LowestBitSet() const { + uint32_t LowestBitSet() const { return container_internal::TrailingZeros(mask_) >> Shift; } - int HighestBitSet() const { - return (sizeof(T) * CHAR_BIT - container_internal::LeadingZeros(mask_) - - 1) >> - Shift; + uint32_t HighestBitSet() const { + return static_cast<uint32_t>((bit_width(mask_) - 1) >> Shift); } BitMask begin() const { return *this; } BitMask end() const { return BitMask(0); } - int TrailingZeros() const { + uint32_t TrailingZeros() const { return container_internal::TrailingZeros(mask_) >> Shift; } - int LeadingZeros() const { + uint32_t LeadingZeros() const { constexpr int total_significant_bits = SignificantBits << Shift; constexpr int extra_bits = sizeof(T) * 8 - total_significant_bits; - return container_internal::LeadingZeros(mask_ << extra_bits) >> Shift; + return countl_zero(mask_ << extra_bits) >> Shift; } private: @@ -248,48 +262,53 @@ class BitMask { T mask_; }; -using ctrl_t = signed char; using h2_t = uint8_t; // The values here are selected for maximum performance. See the static asserts -// below for details. -enum Ctrl : ctrl_t { +// below for details. We use an enum class so that when strict aliasing is +// enabled, the compiler knows ctrl_t doesn't alias other types. +enum class ctrl_t : int8_t { kEmpty = -128, // 0b10000000 kDeleted = -2, // 0b11111110 kSentinel = -1, // 0b11111111 }; static_assert( - kEmpty & kDeleted & kSentinel & 0x80, + (static_cast<int8_t>(ctrl_t::kEmpty) & + static_cast<int8_t>(ctrl_t::kDeleted) & + static_cast<int8_t>(ctrl_t::kSentinel) & 0x80) != 0, "Special markers need to have the MSB to make checking for them efficient"); -static_assert(kEmpty < kSentinel && kDeleted < kSentinel, - "kEmpty and kDeleted must be smaller than kSentinel to make the " - "SIMD test of IsEmptyOrDeleted() efficient"); -static_assert(kSentinel == -1, - "kSentinel must be -1 to elide loading it from memory into SIMD " - "registers (pcmpeqd xmm, xmm)"); -static_assert(kEmpty == -128, - "kEmpty must be -128 to make the SIMD check for its " +static_assert( + ctrl_t::kEmpty < ctrl_t::kSentinel && ctrl_t::kDeleted < ctrl_t::kSentinel, + "ctrl_t::kEmpty and ctrl_t::kDeleted must be smaller than " + "ctrl_t::kSentinel to make the SIMD test of IsEmptyOrDeleted() efficient"); +static_assert( + ctrl_t::kSentinel == static_cast<ctrl_t>(-1), + "ctrl_t::kSentinel must be -1 to elide loading it from memory into SIMD " + "registers (pcmpeqd xmm, xmm)"); +static_assert(ctrl_t::kEmpty == static_cast<ctrl_t>(-128), + "ctrl_t::kEmpty must be -128 to make the SIMD check for its " "existence efficient (psignb xmm, xmm)"); -static_assert(~kEmpty & ~kDeleted & kSentinel & 0x7F, - "kEmpty and kDeleted must share an unset bit that is not shared " - "by kSentinel to make the scalar test for MatchEmptyOrDeleted() " - "efficient"); -static_assert(kDeleted == -2, - "kDeleted must be -2 to make the implementation of " +static_assert( + (~static_cast<int8_t>(ctrl_t::kEmpty) & + ~static_cast<int8_t>(ctrl_t::kDeleted) & + static_cast<int8_t>(ctrl_t::kSentinel) & 0x7F) != 0, + "ctrl_t::kEmpty and ctrl_t::kDeleted must share an unset bit that is not " + "shared by ctrl_t::kSentinel to make the scalar test for " + "MatchEmptyOrDeleted() efficient"); +static_assert(ctrl_t::kDeleted == static_cast<ctrl_t>(-2), + "ctrl_t::kDeleted must be -2 to make the implementation of " "ConvertSpecialToEmptyAndFullToDeleted efficient"); // A single block of empty control bytes for tables without any slots allocated. // This enables removing a branch in the hot path of find(). +ABSL_DLL extern const ctrl_t kEmptyGroup[16]; inline ctrl_t* EmptyGroup() { - alignas(16) static constexpr ctrl_t empty_group[] = { - kSentinel, kEmpty, kEmpty, kEmpty, kEmpty, kEmpty, kEmpty, kEmpty, - kEmpty, kEmpty, kEmpty, kEmpty, kEmpty, kEmpty, kEmpty, kEmpty}; - return const_cast<ctrl_t*>(empty_group); + return const_cast<ctrl_t*>(kEmptyGroup); } // Mixes a randomly generated per-process seed with `hash` and `ctrl` to // randomize insertion order within groups. -bool ShouldInsertBackwards(size_t hash, ctrl_t* ctrl); +bool ShouldInsertBackwards(size_t hash, const ctrl_t* ctrl); // Returns a hash seed. // @@ -305,14 +324,14 @@ inline size_t HashSeed(const ctrl_t* ctrl) { inline size_t H1(size_t hash, const ctrl_t* ctrl) { return (hash >> 7) ^ HashSeed(ctrl); } -inline ctrl_t H2(size_t hash) { return hash & 0x7F; } +inline h2_t H2(size_t hash) { return hash & 0x7F; } -inline bool IsEmpty(ctrl_t c) { return c == kEmpty; } -inline bool IsFull(ctrl_t c) { return c >= 0; } -inline bool IsDeleted(ctrl_t c) { return c == kDeleted; } -inline bool IsEmptyOrDeleted(ctrl_t c) { return c < kSentinel; } +inline bool IsEmpty(ctrl_t c) { return c == ctrl_t::kEmpty; } +inline bool IsFull(ctrl_t c) { return c >= static_cast<ctrl_t>(0); } +inline bool IsDeleted(ctrl_t c) { return c == ctrl_t::kDeleted; } +inline bool IsEmptyOrDeleted(ctrl_t c) { return c < ctrl_t::kSentinel; } -#if SWISSTABLE_HAVE_SSE2 +#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2 // https://github.com/abseil/abseil-cpp/issues/209 // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87853 @@ -346,33 +365,33 @@ struct GroupSse2Impl { // Returns a bitmask representing the positions of empty slots. BitMask<uint32_t, kWidth> MatchEmpty() const { -#if SWISSTABLE_HAVE_SSSE3 - // This only works because kEmpty is -128. +#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSSE3 + // This only works because ctrl_t::kEmpty is -128. return BitMask<uint32_t, kWidth>( _mm_movemask_epi8(_mm_sign_epi8(ctrl, ctrl))); #else - return Match(static_cast<h2_t>(kEmpty)); + return Match(static_cast<h2_t>(ctrl_t::kEmpty)); #endif } // Returns a bitmask representing the positions of empty or deleted slots. BitMask<uint32_t, kWidth> MatchEmptyOrDeleted() const { - auto special = _mm_set1_epi8(kSentinel); + auto special = _mm_set1_epi8(static_cast<int8_t>(ctrl_t::kSentinel)); return BitMask<uint32_t, kWidth>( _mm_movemask_epi8(_mm_cmpgt_epi8_fixed(special, ctrl))); } // Returns the number of trailing empty or deleted elements in the group. uint32_t CountLeadingEmptyOrDeleted() const { - auto special = _mm_set1_epi8(kSentinel); - return TrailingZeros( - _mm_movemask_epi8(_mm_cmpgt_epi8_fixed(special, ctrl)) + 1); + auto special = _mm_set1_epi8(static_cast<int8_t>(ctrl_t::kSentinel)); + return TrailingZeros(static_cast<uint32_t>( + _mm_movemask_epi8(_mm_cmpgt_epi8_fixed(special, ctrl)) + 1)); } void ConvertSpecialToEmptyAndFullToDeleted(ctrl_t* dst) const { auto msbs = _mm_set1_epi8(static_cast<char>(-128)); auto x126 = _mm_set1_epi8(126); -#if SWISSTABLE_HAVE_SSSE3 +#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSSE3 auto res = _mm_or_si128(_mm_shuffle_epi8(x126, ctrl), msbs); #else auto zero = _mm_setzero_si128(); @@ -384,7 +403,7 @@ struct GroupSse2Impl { __m128i ctrl; }; -#endif // SWISSTABLE_HAVE_SSE2 +#endif // ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2 struct GroupPortableImpl { static constexpr size_t kWidth = 8; @@ -399,7 +418,7 @@ struct GroupPortableImpl { // // Caveat: there are false positives but: // - they only occur if there is a real match - // - they never occur on kEmpty, kDeleted, kSentinel + // - they never occur on ctrl_t::kEmpty, ctrl_t::kDeleted, ctrl_t::kSentinel // - they will be handled gracefully by subsequent checks in code // // Example: @@ -438,12 +457,16 @@ struct GroupPortableImpl { uint64_t ctrl; }; -#if SWISSTABLE_HAVE_SSE2 +#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2 using Group = GroupSse2Impl; #else using Group = GroupPortableImpl; #endif +// The number of cloned control bytes that we copy from the beginning to the +// end of the control bytes array. +constexpr size_t NumClonedBytes() { return Group::kWidth - 1; } + template <class Policy, class Hash, class Eq, class Alloc> class raw_hash_set; @@ -451,31 +474,29 @@ inline bool IsValidCapacity(size_t n) { return ((n + 1) & n) == 0 && n > 0; } // PRECONDITION: // IsValidCapacity(capacity) -// ctrl[capacity] == kSentinel -// ctrl[i] != kSentinel for all i < capacity +// ctrl[capacity] == ctrl_t::kSentinel +// ctrl[i] != ctrl_t::kSentinel for all i < capacity // Applies mapping for every byte in ctrl: // DELETED -> EMPTY // EMPTY -> EMPTY // FULL -> DELETED -inline void ConvertDeletedToEmptyAndFullToDeleted( - ctrl_t* ctrl, size_t capacity) { - assert(ctrl[capacity] == kSentinel); - assert(IsValidCapacity(capacity)); - for (ctrl_t* pos = ctrl; pos != ctrl + capacity + 1; pos += Group::kWidth) { - Group{pos}.ConvertSpecialToEmptyAndFullToDeleted(pos); - } - // Copy the cloned ctrl bytes. - std::memcpy(ctrl + capacity + 1, ctrl, Group::kWidth); - ctrl[capacity] = kSentinel; -} +void ConvertDeletedToEmptyAndFullToDeleted(ctrl_t* ctrl, size_t capacity); // Rounds up the capacity to the next power of 2 minus 1, with a minimum of 1. inline size_t NormalizeCapacity(size_t n) { - return n ? ~size_t{} >> LeadingZeros(n) : 1; + return n ? ~size_t{} >> countl_zero(n) : 1; } -// We use 7/8th as maximum load factor. -// For 16-wide groups, that gives an average of two empty slots per group. +// General notes on capacity/growth methods below: +// - We use 7/8th as maximum load factor. For 16-wide groups, that gives an +// average of two empty slots per group. +// - For (capacity+1) >= Group::kWidth, growth is 7/8*capacity. +// - For (capacity+1) < Group::kWidth, growth == capacity. In this case, we +// never need to probe (the whole table fits in one group) so we don't need a +// load factor less than 1. + +// Given `capacity` of the table, returns the size (i.e. number of full slots) +// at which we should grow the capacity. inline size_t CapacityToGrowth(size_t capacity) { assert(IsValidCapacity(capacity)); // `capacity*7/8` @@ -486,7 +507,7 @@ inline size_t CapacityToGrowth(size_t capacity) { return capacity - capacity / 8; } // From desired "growth" to a lowerbound of the necessary capacity. -// Might not be a valid one and required NormalizeCapacity(). +// Might not be a valid one and requires NormalizeCapacity(). inline size_t GrowthToLowerboundCapacity(size_t growth) { // `growth*8/7` if (Group::kWidth == 8 && growth == 7) { @@ -496,6 +517,144 @@ inline size_t GrowthToLowerboundCapacity(size_t growth) { return growth + static_cast<size_t>((static_cast<int64_t>(growth) - 1) / 7); } +template <class InputIter> +size_t SelectBucketCountForIterRange(InputIter first, InputIter last, + size_t bucket_count) { + if (bucket_count != 0) { + return bucket_count; + } + using InputIterCategory = + typename std::iterator_traits<InputIter>::iterator_category; + if (std::is_base_of<std::random_access_iterator_tag, + InputIterCategory>::value) { + return GrowthToLowerboundCapacity( + static_cast<size_t>(std::distance(first, last))); + } + return 0; +} + +inline void AssertIsFull(ctrl_t* ctrl) { + ABSL_HARDENING_ASSERT((ctrl != nullptr && IsFull(*ctrl)) && + "Invalid operation on iterator. The element might have " + "been erased, or the table might have rehashed."); +} + +inline void AssertIsValid(ctrl_t* ctrl) { + ABSL_HARDENING_ASSERT((ctrl == nullptr || IsFull(*ctrl)) && + "Invalid operation on iterator. The element might have " + "been erased, or the table might have rehashed."); +} + +struct FindInfo { + size_t offset; + size_t probe_length; +}; + +// The representation of the object has two modes: +// - small: For capacities < kWidth-1 +// - large: For the rest. +// +// Differences: +// - In small mode we are able to use the whole capacity. The extra control +// bytes give us at least one "empty" control byte to stop the iteration. +// This is important to make 1 a valid capacity. +// +// - In small mode only the first `capacity()` control bytes after the +// sentinel are valid. The rest contain dummy ctrl_t::kEmpty values that do not +// represent a real slot. This is important to take into account on +// find_first_non_full(), where we never try ShouldInsertBackwards() for +// small tables. +inline bool is_small(size_t capacity) { return capacity < Group::kWidth - 1; } + +inline probe_seq<Group::kWidth> probe(const ctrl_t* ctrl, size_t hash, + size_t capacity) { + return probe_seq<Group::kWidth>(H1(hash, ctrl), capacity); +} + +// Probes the raw_hash_set with the probe sequence for hash and returns the +// pointer to the first empty or deleted slot. +// NOTE: this function must work with tables having both ctrl_t::kEmpty and +// ctrl_t::kDeleted in one group. Such tables appears during +// drop_deletes_without_resize. +// +// This function is very useful when insertions happen and: +// - the input is already a set +// - there are enough slots +// - the element with the hash is not in the table +template <typename = void> +inline FindInfo find_first_non_full(const ctrl_t* ctrl, size_t hash, + size_t capacity) { + auto seq = probe(ctrl, hash, capacity); + while (true) { + Group g{ctrl + seq.offset()}; + auto mask = g.MatchEmptyOrDeleted(); + if (mask) { +#if !defined(NDEBUG) + // We want to add entropy even when ASLR is not enabled. + // In debug build we will randomly insert in either the front or back of + // the group. + // TODO(kfm,sbenza): revisit after we do unconditional mixing + if (!is_small(capacity) && ShouldInsertBackwards(hash, ctrl)) { + return {seq.offset(mask.HighestBitSet()), seq.index()}; + } +#endif + return {seq.offset(mask.LowestBitSet()), seq.index()}; + } + seq.next(); + assert(seq.index() <= capacity && "full table!"); + } +} + +// Extern template for inline function keep possibility of inlining. +// When compiler decided to not inline, no symbols will be added to the +// corresponding translation unit. +extern template FindInfo find_first_non_full(const ctrl_t*, size_t, size_t); + +// Reset all ctrl bytes back to ctrl_t::kEmpty, except the sentinel. +inline void ResetCtrl(size_t capacity, ctrl_t* ctrl, const void* slot, + size_t slot_size) { + std::memset(ctrl, static_cast<int8_t>(ctrl_t::kEmpty), + capacity + 1 + NumClonedBytes()); + ctrl[capacity] = ctrl_t::kSentinel; + SanitizerPoisonMemoryRegion(slot, slot_size * capacity); +} + +// Sets the control byte, and if `i < NumClonedBytes()`, set the cloned byte +// at the end too. +inline void SetCtrl(size_t i, ctrl_t h, size_t capacity, ctrl_t* ctrl, + const void* slot, size_t slot_size) { + assert(i < capacity); + + auto* slot_i = static_cast<const char*>(slot) + i * slot_size; + if (IsFull(h)) { + SanitizerUnpoisonMemoryRegion(slot_i, slot_size); + } else { + SanitizerPoisonMemoryRegion(slot_i, slot_size); + } + + ctrl[i] = h; + ctrl[((i - NumClonedBytes()) & capacity) + (NumClonedBytes() & capacity)] = h; +} + +inline void SetCtrl(size_t i, h2_t h, size_t capacity, ctrl_t* ctrl, + const void* slot, size_t slot_size) { + SetCtrl(i, static_cast<ctrl_t>(h), capacity, ctrl, slot, slot_size); +} + +// The allocated block consists of `capacity + 1 + NumClonedBytes()` control +// bytes followed by `capacity` slots, which must be aligned to `slot_align`. +// SlotOffset returns the offset of the slots into the allocated block. +inline size_t SlotOffset(size_t capacity, size_t slot_align) { + assert(IsValidCapacity(capacity)); + const size_t num_control_bytes = capacity + 1 + NumClonedBytes(); + return (num_control_bytes + slot_align - 1) & (~slot_align + 1); +} + +// Returns the size of the allocated block. See also above comment. +inline size_t AllocSize(size_t capacity, size_t slot_size, size_t slot_align) { + return SlotOffset(capacity, slot_align) + capacity * slot_size; +} + // Policy: a policy defines how to perform different operations on // the slots of the hashtable (see hash_policy_traits.h for the full interface // of policy). @@ -510,7 +669,8 @@ inline size_t GrowthToLowerboundCapacity(size_t growth) { // if they are equal, false if they are not. If two keys compare equal, then // their hash values as defined by Hash MUST be equal. // -// Allocator: an Allocator [https://devdocs.io/cpp/concept/allocator] with which +// Allocator: an Allocator +// [https://en.cppreference.com/w/cpp/named_req/Allocator] with which // the storage of the hashtable will be allocated and the elements will be // constructed and destroyed. template <class Policy, class Hash, class Eq, class Alloc> @@ -551,13 +711,6 @@ class raw_hash_set { auto KeyTypeCanBeHashed(const Hash& h, const key_type& k) -> decltype(h(k)); auto KeyTypeCanBeEq(const Eq& eq, const key_type& k) -> decltype(eq(k, k)); - using Layout = absl::container_internal::Layout<ctrl_t, slot_type>; - - static Layout MakeLayout(size_t capacity) { - assert(IsValidCapacity(capacity)); - return Layout(capacity + Group::kWidth + 1, capacity); - } - using AllocTraits = absl::allocator_traits<allocator_type>; using SlotAlloc = typename absl::allocator_traits< allocator_type>::template rebind_alloc<slot_type>; @@ -616,7 +769,7 @@ class raw_hash_set { // PRECONDITION: not an end() iterator. reference operator*() const { - assert_is_full(); + AssertIsFull(ctrl_); return PolicyTraits::element(slot_); } @@ -625,7 +778,7 @@ class raw_hash_set { // PRECONDITION: not an end() iterator. iterator& operator++() { - assert_is_full(); + AssertIsFull(ctrl_); ++ctrl_; ++slot_; skip_empty_or_deleted(); @@ -639,8 +792,8 @@ class raw_hash_set { } friend bool operator==(const iterator& a, const iterator& b) { - a.assert_is_valid(); - b.assert_is_valid(); + AssertIsValid(a.ctrl_); + AssertIsValid(b.ctrl_); return a.ctrl_ == b.ctrl_; } friend bool operator!=(const iterator& a, const iterator& b) { @@ -648,24 +801,19 @@ class raw_hash_set { } private: - iterator(ctrl_t* ctrl) : ctrl_(ctrl) {} // for end() - iterator(ctrl_t* ctrl, slot_type* slot) : ctrl_(ctrl), slot_(slot) {} - - void assert_is_full() const { assert(IsFull(*ctrl_)); } - void assert_is_valid() const { - assert(!ctrl_ || IsFull(*ctrl_) || *ctrl_ == kSentinel); + iterator(ctrl_t* ctrl, slot_type* slot) : ctrl_(ctrl), slot_(slot) { + // This assumption helps the compiler know that any non-end iterator is + // not equal to any end iterator. + ABSL_INTERNAL_ASSUME(ctrl != nullptr); } void skip_empty_or_deleted() { while (IsEmptyOrDeleted(*ctrl_)) { - // ctrl is not necessarily aligned to Group::kWidth. It is also likely - // to read past the space for ctrl bytes and into slots. This is ok - // because ctrl has sizeof() == 1 and slot has sizeof() >= 1 so there - // is no way to read outside the combined slot array. uint32_t shift = Group{ctrl_}.CountLeadingEmptyOrDeleted(); ctrl_ += shift; slot_ += shift; } + if (ABSL_PREDICT_FALSE(*ctrl_ == ctrl_t::kSentinel)) ctrl_ = nullptr; } ctrl_t* ctrl_ = nullptr; @@ -724,10 +872,10 @@ class raw_hash_set { explicit raw_hash_set(size_t bucket_count, const hasher& hash = hasher(), const key_equal& eq = key_equal(), const allocator_type& alloc = allocator_type()) - : ctrl_(EmptyGroup()), settings_(0, hash, eq, alloc) { + : ctrl_(EmptyGroup()), + settings_(0, HashtablezInfoHandle(), hash, eq, alloc) { if (bucket_count) { capacity_ = NormalizeCapacity(bucket_count); - reset_growth_left(); initialize_slots(); } } @@ -746,7 +894,8 @@ class raw_hash_set { raw_hash_set(InputIter first, InputIter last, size_t bucket_count = 0, const hasher& hash = hasher(), const key_equal& eq = key_equal(), const allocator_type& alloc = allocator_type()) - : raw_hash_set(bucket_count, hash, eq, alloc) { + : raw_hash_set(SelectBucketCountForIterRange(first, last, bucket_count), + hash, eq, alloc) { insert(first, last); } @@ -833,10 +982,11 @@ class raw_hash_set { // than a full `insert`. for (const auto& v : that) { const size_t hash = PolicyTraits::apply(HashElement{hash_ref()}, v); - auto target = find_first_non_full(hash); - set_ctrl(target.offset, H2(hash)); + auto target = find_first_non_full(ctrl_, hash, capacity_); + SetCtrl(target.offset, H2(hash), capacity_, ctrl_, slots_, + sizeof(slot_type)); emplace_at(target.offset, v); - infoz_.RecordInsert(hash, target.probe_length); + infoz().RecordInsert(hash, target.probe_length); } size_ = that.size(); growth_left() -= that.size(); @@ -850,28 +1000,27 @@ class raw_hash_set { slots_(absl::exchange(that.slots_, nullptr)), size_(absl::exchange(that.size_, 0)), capacity_(absl::exchange(that.capacity_, 0)), - infoz_(absl::exchange(that.infoz_, HashtablezInfoHandle())), // Hash, equality and allocator are copied instead of moved because // `that` must be left valid. If Hash is std::function<Key>, moving it // would create a nullptr functor that cannot be called. - settings_(that.settings_) { - // growth_left was copied above, reset the one from `that`. - that.growth_left() = 0; - } + settings_(absl::exchange(that.growth_left(), 0), + absl::exchange(that.infoz(), HashtablezInfoHandle()), + that.hash_ref(), that.eq_ref(), that.alloc_ref()) {} raw_hash_set(raw_hash_set&& that, const allocator_type& a) : ctrl_(EmptyGroup()), slots_(nullptr), size_(0), capacity_(0), - settings_(0, that.hash_ref(), that.eq_ref(), a) { + settings_(0, HashtablezInfoHandle(), that.hash_ref(), that.eq_ref(), + a) { if (a == that.alloc_ref()) { std::swap(ctrl_, that.ctrl_); std::swap(slots_, that.slots_); std::swap(size_, that.size_); std::swap(capacity_, that.capacity_); std::swap(growth_left(), that.growth_left()); - std::swap(infoz_, that.infoz_); + std::swap(infoz(), that.infoz()); } else { reserve(that.size()); // Note: this will copy elements of dense_set and unordered_set instead of @@ -907,12 +1056,12 @@ class raw_hash_set { it.skip_empty_or_deleted(); return it; } - iterator end() { return {ctrl_ + capacity_}; } + iterator end() { return {}; } const_iterator begin() const { return const_cast<raw_hash_set*>(this)->begin(); } - const_iterator end() const { return const_cast<raw_hash_set*>(this)->end(); } + const_iterator end() const { return {}; } const_iterator cbegin() const { return begin(); } const_iterator cend() const { return end(); } @@ -931,6 +1080,8 @@ class raw_hash_set { // past that we simply deallocate the array. if (capacity_ > 127) { destroy_slots(); + + infoz().RecordClearedReservation(); } else if (capacity_) { for (size_t i = 0; i != capacity_; ++i) { if (IsFull(ctrl_[i])) { @@ -938,11 +1089,11 @@ class raw_hash_set { } } size_ = 0; - reset_ctrl(); + ResetCtrl(capacity_, ctrl_, slots_, sizeof(slot_type)); reset_growth_left(); } assert(empty()); - infoz_.RecordStorageChanged(0, capacity_); + infoz().RecordStorageChanged(0, capacity_); } // This overload kicks in when the argument is an rvalue of insertable and @@ -1015,7 +1166,7 @@ class raw_hash_set { template <class InputIt> void insert(InputIt first, InputIt last) { - for (; first != last; ++first) insert(*first); + for (; first != last; ++first) emplace(*first); } template <class T, RequiresNotInit<T> = 0, RequiresInsertable<const T&> = 0> @@ -1042,7 +1193,9 @@ class raw_hash_set { } iterator insert(const_iterator, node_type&& node) { - return insert(std::move(node)).first; + auto res = insert(std::move(node)); + node = std::move(res.node); + return res.position; } // This overload kicks in if we can deduce the key from args. This enables us @@ -1171,7 +1324,7 @@ class raw_hash_set { // This overload is necessary because otherwise erase<K>(const K&) would be // a better match if non-const iterator is passed as an argument. void erase(iterator it) { - it.assert_is_full(); + AssertIsFull(it.ctrl_); PolicyTraits::destroy(&alloc_ref(), it.slot_); erase_meta_only(it); } @@ -1205,7 +1358,7 @@ class raw_hash_set { } node_type extract(const_iterator position) { - position.inner_.assert_is_full(); + AssertIsFull(position.inner_.ctrl_); auto node = CommonAccess::Transfer<node_type>(alloc_ref(), position.inner_.slot_); erase_meta_only(position); @@ -1222,8 +1375,8 @@ class raw_hash_set { void swap(raw_hash_set& that) noexcept( IsNoThrowSwappable<hasher>() && IsNoThrowSwappable<key_equal>() && - (!AllocTraits::propagate_on_container_swap::value || - IsNoThrowSwappable<allocator_type>())) { + IsNoThrowSwappable<allocator_type>( + typename AllocTraits::propagate_on_container_swap{})) { using std::swap; swap(ctrl_, that.ctrl_); swap(slots_, that.slots_); @@ -1232,32 +1385,43 @@ class raw_hash_set { swap(growth_left(), that.growth_left()); swap(hash_ref(), that.hash_ref()); swap(eq_ref(), that.eq_ref()); - swap(infoz_, that.infoz_); - if (AllocTraits::propagate_on_container_swap::value) { - swap(alloc_ref(), that.alloc_ref()); - } else { - // If the allocators do not compare equal it is officially undefined - // behavior. We choose to do nothing. - } + swap(infoz(), that.infoz()); + SwapAlloc(alloc_ref(), that.alloc_ref(), + typename AllocTraits::propagate_on_container_swap{}); } void rehash(size_t n) { if (n == 0 && capacity_ == 0) return; if (n == 0 && size_ == 0) { destroy_slots(); - infoz_.RecordStorageChanged(0, 0); + infoz().RecordStorageChanged(0, 0); + infoz().RecordClearedReservation(); return; } + // bitor is a faster way of doing `max` here. We will round up to the next // power-of-2-minus-1, so bitor is good enough. auto m = NormalizeCapacity(n | GrowthToLowerboundCapacity(size())); // n == 0 unconditionally rehashes as per the standard. if (n == 0 || m > capacity_) { resize(m); + + // This is after resize, to ensure that we have completed the allocation + // and have potentially sampled the hashtable. + infoz().RecordReservation(n); } } - void reserve(size_t n) { rehash(GrowthToLowerboundCapacity(n)); } + void reserve(size_t n) { + if (n > size() + growth_left()) { + size_t m = GrowthToLowerboundCapacity(n); + resize(NormalizeCapacity(m)); + + // This is after resize, to ensure that we have completed the allocation + // and have potentially sampled the hashtable. + infoz().RecordReservation(n); + } + } // Extension API: support for heterogeneous keys. // @@ -1282,7 +1446,8 @@ class raw_hash_set { void prefetch(const key_arg<K>& key) const { (void)key; #if defined(__GNUC__) - auto seq = probe(hash_ref()(key)); + prefetch_heap_block(); + auto seq = probe(ctrl_, hash_ref()(key), capacity_); __builtin_prefetch(static_cast<const void*>(ctrl_ + seq.offset())); __builtin_prefetch(static_cast<const void*>(slots_ + seq.offset())); #endif // __GNUC__ @@ -1297,7 +1462,7 @@ class raw_hash_set { // called heterogeneous key support. template <class K = key_type> iterator find(const key_arg<K>& key, size_t hash) { - auto seq = probe(hash); + auto seq = probe(ctrl_, hash, capacity_); while (true) { Group g{ctrl_ + seq.offset()}; for (int i : g.Match(H2(hash))) { @@ -1308,10 +1473,12 @@ class raw_hash_set { } if (ABSL_PREDICT_TRUE(g.MatchEmpty())) return end(); seq.next(); + assert(seq.index() <= capacity_ && "full table!"); } } template <class K = key_type> iterator find(const key_arg<K>& key) { + prefetch_heap_block(); return find(key, hash_ref()(key)); } @@ -1321,6 +1488,7 @@ class raw_hash_set { } template <class K = key_type> const_iterator find(const key_arg<K>& key) const { + prefetch_heap_block(); return find(key, hash_ref()(key)); } @@ -1455,9 +1623,10 @@ class raw_hash_set { static_cast<size_t>(empty_after.TrailingZeros() + empty_before.LeadingZeros()) < Group::kWidth; - set_ctrl(index, was_never_full ? kEmpty : kDeleted); + SetCtrl(index, was_never_full ? ctrl_t::kEmpty : ctrl_t::kDeleted, + capacity_, ctrl_, slots_, sizeof(slot_type)); growth_left() += was_never_full; - infoz_.RecordErase(); + infoz().RecordErase(); } void initialize_slots() { @@ -1474,17 +1643,18 @@ class raw_hash_set { // bound more carefully. if (std::is_same<SlotAlloc, std::allocator<slot_type>>::value && slots_ == nullptr) { - infoz_ = Sample(); + infoz() = Sample(sizeof(slot_type)); } - auto layout = MakeLayout(capacity_); - char* mem = static_cast<char*>( - Allocate<Layout::Alignment()>(&alloc_ref(), layout.AllocSize())); - ctrl_ = reinterpret_cast<ctrl_t*>(layout.template Pointer<0>(mem)); - slots_ = layout.template Pointer<1>(mem); - reset_ctrl(); + char* mem = static_cast<char*>(Allocate<alignof(slot_type)>( + &alloc_ref(), + AllocSize(capacity_, sizeof(slot_type), alignof(slot_type)))); + ctrl_ = reinterpret_cast<ctrl_t*>(mem); + slots_ = reinterpret_cast<slot_type*>( + mem + SlotOffset(capacity_, alignof(slot_type))); + ResetCtrl(capacity_, ctrl_, slots_, sizeof(slot_type)); reset_growth_left(); - infoz_.RecordStorageChanged(size_, capacity_); + infoz().RecordStorageChanged(size_, capacity_); } void destroy_slots() { @@ -1494,10 +1664,12 @@ class raw_hash_set { PolicyTraits::destroy(&alloc_ref(), slots_ + i); } } - auto layout = MakeLayout(capacity_); + // Unpoison before returning the memory to the allocator. SanitizerUnpoisonMemoryRegion(slots_, sizeof(slot_type) * capacity_); - Deallocate<Layout::Alignment()>(&alloc_ref(), ctrl_, layout.AllocSize()); + Deallocate<alignof(slot_type)>( + &alloc_ref(), ctrl_, + AllocSize(capacity_, sizeof(slot_type), alignof(slot_type))); ctrl_ = EmptyGroup(); slots_ = nullptr; size_ = 0; @@ -1518,26 +1690,26 @@ class raw_hash_set { if (IsFull(old_ctrl[i])) { size_t hash = PolicyTraits::apply(HashElement{hash_ref()}, PolicyTraits::element(old_slots + i)); - auto target = find_first_non_full(hash); + auto target = find_first_non_full(ctrl_, hash, capacity_); size_t new_i = target.offset; total_probe_length += target.probe_length; - set_ctrl(new_i, H2(hash)); + SetCtrl(new_i, H2(hash), capacity_, ctrl_, slots_, sizeof(slot_type)); PolicyTraits::transfer(&alloc_ref(), slots_ + new_i, old_slots + i); } } if (old_capacity) { SanitizerUnpoisonMemoryRegion(old_slots, sizeof(slot_type) * old_capacity); - auto layout = MakeLayout(old_capacity); - Deallocate<Layout::Alignment()>(&alloc_ref(), old_ctrl, - layout.AllocSize()); + Deallocate<alignof(slot_type)>( + &alloc_ref(), old_ctrl, + AllocSize(old_capacity, sizeof(slot_type), alignof(slot_type))); } - infoz_.RecordRehash(total_probe_length); + infoz().RecordRehash(total_probe_length); } void drop_deletes_without_resize() ABSL_ATTRIBUTE_NOINLINE { assert(IsValidCapacity(capacity_)); - assert(!is_small()); + assert(!is_small(capacity_)); // Algorithm: // - mark all DELETED slots as EMPTY // - mark all FULL slots as DELETED @@ -1560,34 +1732,35 @@ class raw_hash_set { slot_type* slot = reinterpret_cast<slot_type*>(&raw); for (size_t i = 0; i != capacity_; ++i) { if (!IsDeleted(ctrl_[i])) continue; - size_t hash = PolicyTraits::apply(HashElement{hash_ref()}, - PolicyTraits::element(slots_ + i)); - auto target = find_first_non_full(hash); - size_t new_i = target.offset; + const size_t hash = PolicyTraits::apply( + HashElement{hash_ref()}, PolicyTraits::element(slots_ + i)); + const FindInfo target = find_first_non_full(ctrl_, hash, capacity_); + const size_t new_i = target.offset; total_probe_length += target.probe_length; // Verify if the old and new i fall within the same group wrt the hash. // If they do, we don't need to move the object as it falls already in the // best probe we can. - const auto probe_index = [&](size_t pos) { - return ((pos - probe(hash).offset()) & capacity_) / Group::kWidth; + const size_t probe_offset = probe(ctrl_, hash, capacity_).offset(); + const auto probe_index = [probe_offset, this](size_t pos) { + return ((pos - probe_offset) & capacity_) / Group::kWidth; }; // Element doesn't move. if (ABSL_PREDICT_TRUE(probe_index(new_i) == probe_index(i))) { - set_ctrl(i, H2(hash)); + SetCtrl(i, H2(hash), capacity_, ctrl_, slots_, sizeof(slot_type)); continue; } if (IsEmpty(ctrl_[new_i])) { // Transfer element to the empty spot. - // set_ctrl poisons/unpoisons the slots so we have to call it at the + // SetCtrl poisons/unpoisons the slots so we have to call it at the // right time. - set_ctrl(new_i, H2(hash)); + SetCtrl(new_i, H2(hash), capacity_, ctrl_, slots_, sizeof(slot_type)); PolicyTraits::transfer(&alloc_ref(), slots_ + new_i, slots_ + i); - set_ctrl(i, kEmpty); + SetCtrl(i, ctrl_t::kEmpty, capacity_, ctrl_, slots_, sizeof(slot_type)); } else { assert(IsDeleted(ctrl_[new_i])); - set_ctrl(new_i, H2(hash)); + SetCtrl(new_i, H2(hash), capacity_, ctrl_, slots_, sizeof(slot_type)); // Until we are done rehashing, DELETED marks previously FULL slots. // Swap i and new_i elements. PolicyTraits::transfer(&alloc_ref(), slot, slots_ + i); @@ -1597,14 +1770,56 @@ class raw_hash_set { } } reset_growth_left(); - infoz_.RecordRehash(total_probe_length); + infoz().RecordRehash(total_probe_length); } void rehash_and_grow_if_necessary() { if (capacity_ == 0) { resize(1); - } else if (size() <= CapacityToGrowth(capacity()) / 2) { + } else if (capacity_ > Group::kWidth && + // Do these calcuations in 64-bit to avoid overflow. + size() * uint64_t{32} <= capacity_ * uint64_t{25}) { // Squash DELETED without growing if there is enough capacity. + // + // Rehash in place if the current size is <= 25/32 of capacity_. + // Rationale for such a high factor: 1) drop_deletes_without_resize() is + // faster than resize, and 2) it takes quite a bit of work to add + // tombstones. In the worst case, seems to take approximately 4 + // insert/erase pairs to create a single tombstone and so if we are + // rehashing because of tombstones, we can afford to rehash-in-place as + // long as we are reclaiming at least 1/8 the capacity without doing more + // than 2X the work. (Where "work" is defined to be size() for rehashing + // or rehashing in place, and 1 for an insert or erase.) But rehashing in + // place is faster per operation than inserting or even doubling the size + // of the table, so we actually afford to reclaim even less space from a + // resize-in-place. The decision is to rehash in place if we can reclaim + // at about 1/8th of the usable capacity (specifically 3/28 of the + // capacity) which means that the total cost of rehashing will be a small + // fraction of the total work. + // + // Here is output of an experiment using the BM_CacheInSteadyState + // benchmark running the old case (where we rehash-in-place only if we can + // reclaim at least 7/16*capacity_) vs. this code (which rehashes in place + // if we can recover 3/32*capacity_). + // + // Note that although in the worst-case number of rehashes jumped up from + // 15 to 190, but the number of operations per second is almost the same. + // + // Abridged output of running BM_CacheInSteadyState benchmark from + // raw_hash_set_benchmark. N is the number of insert/erase operations. + // + // | OLD (recover >= 7/16 | NEW (recover >= 3/32) + // size | N/s LoadFactor NRehashes | N/s LoadFactor NRehashes + // 448 | 145284 0.44 18 | 140118 0.44 19 + // 493 | 152546 0.24 11 | 151417 0.48 28 + // 538 | 151439 0.26 11 | 151152 0.53 38 + // 583 | 151765 0.28 11 | 150572 0.57 50 + // 628 | 150241 0.31 11 | 150853 0.61 66 + // 672 | 149602 0.33 12 | 150110 0.66 90 + // 717 | 149998 0.35 12 | 149531 0.70 129 + // 762 | 149836 0.37 13 | 148559 0.74 190 + // 807 | 149736 0.39 14 | 151107 0.39 14 + // 852 | 150204 0.42 15 | 151019 0.42 15 drop_deletes_without_resize(); } else { // Otherwise grow the container. @@ -1614,7 +1829,7 @@ class raw_hash_set { bool has_element(const value_type& elem) const { size_t hash = PolicyTraits::apply(HashElement{hash_ref()}, elem); - auto seq = probe(hash); + auto seq = probe(ctrl_, hash, capacity_); while (true) { Group g{ctrl_ + seq.offset()}; for (int i : g.Match(H2(hash))) { @@ -1624,46 +1839,11 @@ class raw_hash_set { } if (ABSL_PREDICT_TRUE(g.MatchEmpty())) return false; seq.next(); - assert(seq.index() < capacity_ && "full table!"); + assert(seq.index() <= capacity_ && "full table!"); } return false; } - // Probes the raw_hash_set with the probe sequence for hash and returns the - // pointer to the first empty or deleted slot. - // NOTE: this function must work with tables having both kEmpty and kDelete - // in one group. Such tables appears during drop_deletes_without_resize. - // - // This function is very useful when insertions happen and: - // - the input is already a set - // - there are enough slots - // - the element with the hash is not in the table - struct FindInfo { - size_t offset; - size_t probe_length; - }; - FindInfo find_first_non_full(size_t hash) { - auto seq = probe(hash); - while (true) { - Group g{ctrl_ + seq.offset()}; - auto mask = g.MatchEmptyOrDeleted(); - if (mask) { -#if !defined(NDEBUG) - // We want to add entropy even when ASLR is not enabled. - // In debug build we will randomly insert in either the front or back of - // the group. - // TODO(kfm,sbenza): revisit after we do unconditional mixing - if (!is_small() && ShouldInsertBackwards(hash, ctrl_)) { - return {seq.offset(mask.HighestBitSet()), seq.index()}; - } -#endif - return {seq.offset(mask.LowestBitSet()), seq.index()}; - } - assert(seq.index() < capacity_ && "full table!"); - seq.next(); - } - } - // TODO(alkis): Optimize this assuming *this and that don't overlap. raw_hash_set& move_assign(raw_hash_set&& that, std::true_type) { raw_hash_set tmp(std::move(that)); @@ -1679,8 +1859,9 @@ class raw_hash_set { protected: template <class K> std::pair<size_t, bool> find_or_prepare_insert(const K& key) { + prefetch_heap_block(); auto hash = hash_ref()(key); - auto seq = probe(hash); + auto seq = probe(ctrl_, hash, capacity_); while (true) { Group g{ctrl_ + seq.offset()}; for (int i : g.Match(H2(hash))) { @@ -1691,21 +1872,23 @@ class raw_hash_set { } if (ABSL_PREDICT_TRUE(g.MatchEmpty())) break; seq.next(); + assert(seq.index() <= capacity_ && "full table!"); } return {prepare_insert(hash), true}; } size_t prepare_insert(size_t hash) ABSL_ATTRIBUTE_NOINLINE { - auto target = find_first_non_full(hash); + auto target = find_first_non_full(ctrl_, hash, capacity_); if (ABSL_PREDICT_FALSE(growth_left() == 0 && !IsDeleted(ctrl_[target.offset]))) { rehash_and_grow_if_necessary(); - target = find_first_non_full(hash); + target = find_first_non_full(ctrl_, hash, capacity_); } ++size_; growth_left() -= IsEmpty(ctrl_[target.offset]); - set_ctrl(target.offset, H2(hash)); - infoz_.RecordInsert(hash, target.probe_length); + SetCtrl(target.offset, H2(hash), capacity_, ctrl_, slots_, + sizeof(slot_type)); + infoz().RecordInsert(hash, target.probe_length); return target.offset; } @@ -1733,84 +1916,54 @@ class raw_hash_set { private: friend struct RawHashSetTestOnlyAccess; - probe_seq<Group::kWidth> probe(size_t hash) const { - return probe_seq<Group::kWidth>(H1(hash, ctrl_), capacity_); - } - - // Reset all ctrl bytes back to kEmpty, except the sentinel. - void reset_ctrl() { - std::memset(ctrl_, kEmpty, capacity_ + Group::kWidth); - ctrl_[capacity_] = kSentinel; - SanitizerPoisonMemoryRegion(slots_, sizeof(slot_type) * capacity_); - } - void reset_growth_left() { growth_left() = CapacityToGrowth(capacity()) - size_; } - // Sets the control byte, and if `i < Group::kWidth`, set the cloned byte at - // the end too. - void set_ctrl(size_t i, ctrl_t h) { - assert(i < capacity_); - - if (IsFull(h)) { - SanitizerUnpoisonObject(slots_ + i); - } else { - SanitizerPoisonObject(slots_ + i); - } + size_t& growth_left() { return settings_.template get<0>(); } - ctrl_[i] = h; - ctrl_[((i - Group::kWidth) & capacity_) + 1 + - ((Group::kWidth - 1) & capacity_)] = h; + void prefetch_heap_block() const { + // Prefetch the heap-allocated memory region to resolve potential TLB + // misses. This is intended to overlap with execution of calculating the + // hash for a key. +#if defined(__GNUC__) + __builtin_prefetch(static_cast<const void*>(ctrl_), 0, 1); +#endif // __GNUC__ } - size_t& growth_left() { return settings_.template get<0>(); } + HashtablezInfoHandle& infoz() { return settings_.template get<1>(); } - // The representation of the object has two modes: - // - small: For capacities < kWidth-1 - // - large: For the rest. - // - // Differences: - // - In small mode we are able to use the whole capacity. The extra control - // bytes give us at least one "empty" control byte to stop the iteration. - // This is important to make 1 a valid capacity. - // - // - In small mode only the first `capacity()` control bytes after the - // sentinel are valid. The rest contain dummy kEmpty values that do not - // represent a real slot. This is important to take into account on - // find_first_non_full(), where we never try ShouldInsertBackwards() for - // small tables. - bool is_small() const { return capacity_ < Group::kWidth - 1; } - - hasher& hash_ref() { return settings_.template get<1>(); } - const hasher& hash_ref() const { return settings_.template get<1>(); } - key_equal& eq_ref() { return settings_.template get<2>(); } - const key_equal& eq_ref() const { return settings_.template get<2>(); } - allocator_type& alloc_ref() { return settings_.template get<3>(); } + hasher& hash_ref() { return settings_.template get<2>(); } + const hasher& hash_ref() const { return settings_.template get<2>(); } + key_equal& eq_ref() { return settings_.template get<3>(); } + const key_equal& eq_ref() const { return settings_.template get<3>(); } + allocator_type& alloc_ref() { return settings_.template get<4>(); } const allocator_type& alloc_ref() const { - return settings_.template get<3>(); + return settings_.template get<4>(); } // TODO(alkis): Investigate removing some of these fields: // - ctrl/slots can be derived from each other // - size can be moved into the slot array - ctrl_t* ctrl_ = EmptyGroup(); // [(capacity + 1) * ctrl_t] - slot_type* slots_ = nullptr; // [capacity * slot_type] - size_t size_ = 0; // number of full slots - size_t capacity_ = 0; // total number of slots - HashtablezInfoHandle infoz_; - absl::container_internal::CompressedTuple<size_t /* growth_left */, hasher, + ctrl_t* ctrl_ = EmptyGroup(); // [(capacity + 1 + NumClonedBytes()) * ctrl_t] + slot_type* slots_ = nullptr; // [capacity * slot_type] + size_t size_ = 0; // number of full slots + size_t capacity_ = 0; // total number of slots + absl::container_internal::CompressedTuple<size_t /* growth_left */, + HashtablezInfoHandle, hasher, key_equal, allocator_type> - settings_{0, hasher{}, key_equal{}, allocator_type{}}; + settings_{0, HashtablezInfoHandle{}, hasher{}, key_equal{}, + allocator_type{}}; }; // Erases all elements that satisfy the predicate `pred` from the container `c`. template <typename P, typename H, typename E, typename A, typename Predicate> -void EraseIf(Predicate pred, raw_hash_set<P, H, E, A>* c) { +void EraseIf(Predicate& pred, raw_hash_set<P, H, E, A>* c) { for (auto it = c->begin(), last = c->end(); it != last;) { - auto copy_it = it++; - if (pred(*copy_it)) { - c->erase(copy_it); + if (pred(*it)) { + c->erase(it++); + } else { + ++it; } } } @@ -1825,7 +1978,7 @@ struct HashtableDebugAccess<Set, absl::void_t<typename Set::raw_hash_set>> { const typename Set::key_type& key) { size_t num_probes = 0; size_t hash = set.hash_ref()(key); - auto seq = set.probe(hash); + auto seq = probe(set.ctrl_, hash, set.capacity_); while (true) { container_internal::Group g{set.ctrl_ + seq.offset()}; for (int i : g.Match(container_internal::H2(hash))) { @@ -1845,8 +1998,7 @@ struct HashtableDebugAccess<Set, absl::void_t<typename Set::raw_hash_set>> { static size_t AllocatedByteSize(const Set& c) { size_t capacity = c.capacity_; if (capacity == 0) return 0; - auto layout = Set::MakeLayout(capacity); - size_t m = layout.AllocSize(); + size_t m = AllocSize(capacity, sizeof(Slot), alignof(Slot)); size_t per_slot = Traits::space_used(static_cast<const Slot*>(nullptr)); if (per_slot != ~size_t{}) { @@ -1864,8 +2016,8 @@ struct HashtableDebugAccess<Set, absl::void_t<typename Set::raw_hash_set>> { static size_t LowerBoundAllocatedByteSize(size_t size) { size_t capacity = GrowthToLowerboundCapacity(size); if (capacity == 0) return 0; - auto layout = Set::MakeLayout(NormalizeCapacity(capacity)); - size_t m = layout.AllocSize(); + size_t m = + AllocSize(NormalizeCapacity(capacity), sizeof(Slot), alignof(Slot)); size_t per_slot = Traits::space_used(static_cast<const Slot*>(nullptr)); if (per_slot != ~size_t{}) { m += per_slot * size; diff --git a/third_party/abseil-cpp/absl/container/internal/raw_hash_set_allocator_test.cc b/third_party/abseil-cpp/absl/container/internal/raw_hash_set_allocator_test.cc index 7ac4b9f7df..e73f53fd63 100644 --- a/third_party/abseil-cpp/absl/container/internal/raw_hash_set_allocator_test.cc +++ b/third_party/abseil-cpp/absl/container/internal/raw_hash_set_allocator_test.cc @@ -424,6 +424,81 @@ TEST_F(PropagateOnAll, Swap) { EXPECT_EQ(0, it->num_copies()); } +// This allocator is similar to std::pmr::polymorphic_allocator. +// Note the disabled assignment. +template <class T> +class PAlloc { + template <class> + friend class PAlloc; + + public: + // types + using value_type = T; + + // traits + using propagate_on_container_swap = std::false_type; + + PAlloc() noexcept = default; + explicit PAlloc(size_t id) noexcept : id_(id) {} + PAlloc(const PAlloc&) noexcept = default; + PAlloc& operator=(const PAlloc&) noexcept = delete; + + template <class U> + PAlloc(const PAlloc<U>& that) noexcept : id_(that.id_) {} // NOLINT + + template <class U> + struct rebind { + using other = PAlloc<U>; + }; + + constexpr PAlloc select_on_container_copy_construction() const { return {}; } + + // public member functions + T* allocate(size_t) { return new T; } + void deallocate(T* p, size_t) { delete p; } + + friend bool operator==(const PAlloc& a, const PAlloc& b) { + return a.id_ == b.id_; + } + friend bool operator!=(const PAlloc& a, const PAlloc& b) { return !(a == b); } + + private: + size_t id_ = std::numeric_limits<size_t>::max(); +}; + +// This doesn't compile with GCC 5.4 and 5.5 due to a bug in noexcept handing. +#if !defined(__GNUC__) || __GNUC__ != 5 || (__GNUC_MINOR__ != 4 && \ + __GNUC_MINOR__ != 5) +TEST(NoPropagateOn, Swap) { + using PA = PAlloc<char>; + using Table = raw_hash_set<Policy, Identity, std::equal_to<int32_t>, PA>; + + Table t1(PA{1}), t2(PA{2}); + swap(t1, t2); + EXPECT_EQ(t1.get_allocator(), PA(1)); + EXPECT_EQ(t2.get_allocator(), PA(2)); +} +#endif + +TEST(NoPropagateOn, CopyConstruct) { + using PA = PAlloc<char>; + using Table = raw_hash_set<Policy, Identity, std::equal_to<int32_t>, PA>; + + Table t1(PA{1}), t2(t1); + EXPECT_EQ(t1.get_allocator(), PA(1)); + EXPECT_EQ(t2.get_allocator(), PA()); +} + +TEST(NoPropagateOn, Assignment) { + using PA = PAlloc<char>; + using Table = raw_hash_set<Policy, Identity, std::equal_to<int32_t>, PA>; + + Table t1(PA{1}), t2(PA{2}); + t1 = t2; + EXPECT_EQ(t1.get_allocator(), PA(1)); + EXPECT_EQ(t2.get_allocator(), PA(2)); +} + } // namespace } // namespace container_internal ABSL_NAMESPACE_END diff --git a/third_party/abseil-cpp/absl/container/internal/raw_hash_set_benchmark.cc b/third_party/abseil-cpp/absl/container/internal/raw_hash_set_benchmark.cc new file mode 100644 index 0000000000..c886d3ad43 --- /dev/null +++ b/third_party/abseil-cpp/absl/container/internal/raw_hash_set_benchmark.cc @@ -0,0 +1,431 @@ +// 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 +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +#include "absl/container/internal/raw_hash_set.h" + +#include <numeric> +#include <random> + +#include "absl/base/internal/raw_logging.h" +#include "absl/container/internal/hash_function_defaults.h" +#include "absl/strings/str_format.h" +#include "benchmark/benchmark.h" + +namespace absl { +ABSL_NAMESPACE_BEGIN +namespace container_internal { + +struct RawHashSetTestOnlyAccess { + template <typename C> + static auto GetSlots(const C& c) -> decltype(c.slots_) { + return c.slots_; + } +}; + +namespace { + +struct IntPolicy { + using slot_type = int64_t; + using key_type = int64_t; + using init_type = int64_t; + + static void construct(void*, int64_t* slot, int64_t v) { *slot = v; } + static void destroy(void*, int64_t*) {} + static void transfer(void*, int64_t* new_slot, int64_t* old_slot) { + *new_slot = *old_slot; + } + + static int64_t& element(slot_type* slot) { return *slot; } + + template <class F> + static auto apply(F&& f, int64_t x) -> decltype(std::forward<F>(f)(x, x)) { + return std::forward<F>(f)(x, x); + } +}; + +class StringPolicy { + template <class F, class K, class V, + class = typename std::enable_if< + std::is_convertible<const K&, absl::string_view>::value>::type> + decltype(std::declval<F>()( + std::declval<const absl::string_view&>(), std::piecewise_construct, + std::declval<std::tuple<K>>(), + std::declval<V>())) static apply_impl(F&& f, + std::pair<std::tuple<K>, V> p) { + const absl::string_view& key = std::get<0>(p.first); + return std::forward<F>(f)(key, std::piecewise_construct, std::move(p.first), + std::move(p.second)); + } + + public: + struct slot_type { + struct ctor {}; + + template <class... Ts> + slot_type(ctor, Ts&&... ts) : pair(std::forward<Ts>(ts)...) {} + + std::pair<std::string, std::string> pair; + }; + + using key_type = std::string; + using init_type = std::pair<std::string, std::string>; + + template <class allocator_type, class... Args> + static void construct(allocator_type* alloc, slot_type* slot, Args... args) { + std::allocator_traits<allocator_type>::construct( + *alloc, slot, typename slot_type::ctor(), std::forward<Args>(args)...); + } + + template <class allocator_type> + static void destroy(allocator_type* alloc, slot_type* slot) { + std::allocator_traits<allocator_type>::destroy(*alloc, slot); + } + + template <class allocator_type> + static void transfer(allocator_type* alloc, slot_type* new_slot, + slot_type* old_slot) { + construct(alloc, new_slot, std::move(old_slot->pair)); + destroy(alloc, old_slot); + } + + static std::pair<std::string, std::string>& element(slot_type* slot) { + return slot->pair; + } + + template <class F, class... Args> + static auto apply(F&& f, Args&&... args) + -> decltype(apply_impl(std::forward<F>(f), + PairArgs(std::forward<Args>(args)...))) { + return apply_impl(std::forward<F>(f), + PairArgs(std::forward<Args>(args)...)); + } +}; + +struct StringHash : container_internal::hash_default_hash<absl::string_view> { + using is_transparent = void; +}; +struct StringEq : std::equal_to<absl::string_view> { + using is_transparent = void; +}; + +struct StringTable + : raw_hash_set<StringPolicy, StringHash, StringEq, std::allocator<int>> { + using Base = typename StringTable::raw_hash_set; + StringTable() {} + using Base::Base; +}; + +struct IntTable + : raw_hash_set<IntPolicy, container_internal::hash_default_hash<int64_t>, + std::equal_to<int64_t>, std::allocator<int64_t>> { + using Base = typename IntTable::raw_hash_set; + IntTable() {} + using Base::Base; +}; + +struct string_generator { + template <class RNG> + std::string operator()(RNG& rng) const { + std::string res; + res.resize(12); + std::uniform_int_distribution<uint32_t> printable_ascii(0x20, 0x7E); + std::generate(res.begin(), res.end(), [&] { return printable_ascii(rng); }); + return res; + } + + size_t size; +}; + +// Model a cache in steady state. +// +// On a table of size N, keep deleting the LRU entry and add a random one. +void BM_CacheInSteadyState(benchmark::State& state) { + std::random_device rd; + std::mt19937 rng(rd()); + string_generator gen{12}; + StringTable t; + std::deque<std::string> keys; + while (t.size() < state.range(0)) { + auto x = t.emplace(gen(rng), gen(rng)); + if (x.second) keys.push_back(x.first->first); + } + ABSL_RAW_CHECK(state.range(0) >= 10, ""); + while (state.KeepRunning()) { + // Some cache hits. + std::deque<std::string>::const_iterator it; + for (int i = 0; i != 90; ++i) { + if (i % 10 == 0) it = keys.end(); + ::benchmark::DoNotOptimize(t.find(*--it)); + } + // Some cache misses. + for (int i = 0; i != 10; ++i) ::benchmark::DoNotOptimize(t.find(gen(rng))); + ABSL_RAW_CHECK(t.erase(keys.front()), keys.front().c_str()); + keys.pop_front(); + while (true) { + auto x = t.emplace(gen(rng), gen(rng)); + if (x.second) { + keys.push_back(x.first->first); + break; + } + } + } + state.SetItemsProcessed(state.iterations()); + state.SetLabel(absl::StrFormat("load_factor=%.2f", t.load_factor())); +} + +template <typename Benchmark> +void CacheInSteadyStateArgs(Benchmark* bm) { + // The default. + const float max_load_factor = 0.875; + // When the cache is at the steady state, the probe sequence will equal + // capacity if there is no reclamation of deleted slots. Pick a number large + // enough to make the benchmark slow for that case. + const size_t capacity = 1 << 10; + + // Check N data points to cover load factors in [0.4, 0.8). + const size_t kNumPoints = 10; + for (size_t i = 0; i != kNumPoints; ++i) + bm->Arg(std::ceil( + capacity * (max_load_factor + i * max_load_factor / kNumPoints) / 2)); +} +BENCHMARK(BM_CacheInSteadyState)->Apply(CacheInSteadyStateArgs); + +void BM_EndComparison(benchmark::State& state) { + std::random_device rd; + std::mt19937 rng(rd()); + string_generator gen{12}; + StringTable t; + while (t.size() < state.range(0)) { + t.emplace(gen(rng), gen(rng)); + } + + for (auto _ : state) { + for (auto it = t.begin(); it != t.end(); ++it) { + benchmark::DoNotOptimize(it); + benchmark::DoNotOptimize(t); + benchmark::DoNotOptimize(it != t.end()); + } + } +} +BENCHMARK(BM_EndComparison)->Arg(400); + +void BM_CopyCtor(benchmark::State& state) { + std::random_device rd; + std::mt19937 rng(rd()); + IntTable t; + std::uniform_int_distribution<uint64_t> dist(0, ~uint64_t{}); + + while (t.size() < state.range(0)) { + t.emplace(dist(rng)); + } + + for (auto _ : state) { + IntTable t2 = t; + benchmark::DoNotOptimize(t2); + } +} +BENCHMARK(BM_CopyCtor)->Range(128, 4096); + +void BM_CopyAssign(benchmark::State& state) { + std::random_device rd; + std::mt19937 rng(rd()); + IntTable t; + std::uniform_int_distribution<uint64_t> dist(0, ~uint64_t{}); + while (t.size() < state.range(0)) { + t.emplace(dist(rng)); + } + + IntTable t2; + for (auto _ : state) { + t2 = t; + benchmark::DoNotOptimize(t2); + } +} +BENCHMARK(BM_CopyAssign)->Range(128, 4096); + +void BM_RangeCtor(benchmark::State& state) { + std::random_device rd; + std::mt19937 rng(rd()); + std::uniform_int_distribution<uint64_t> dist(0, ~uint64_t{}); + std::vector<int> values; + const size_t desired_size = state.range(0); + while (values.size() < desired_size) { + values.emplace_back(dist(rng)); + } + + for (auto unused : state) { + IntTable t{values.begin(), values.end()}; + benchmark::DoNotOptimize(t); + } +} +BENCHMARK(BM_RangeCtor)->Range(128, 65536); + +void BM_NoOpReserveIntTable(benchmark::State& state) { + IntTable t; + t.reserve(100000); + for (auto _ : state) { + benchmark::DoNotOptimize(t); + t.reserve(100000); + } +} +BENCHMARK(BM_NoOpReserveIntTable); + +void BM_NoOpReserveStringTable(benchmark::State& state) { + StringTable t; + t.reserve(100000); + for (auto _ : state) { + benchmark::DoNotOptimize(t); + t.reserve(100000); + } +} +BENCHMARK(BM_NoOpReserveStringTable); + +void BM_ReserveIntTable(benchmark::State& state) { + int reserve_size = state.range(0); + for (auto _ : state) { + state.PauseTiming(); + IntTable t; + state.ResumeTiming(); + benchmark::DoNotOptimize(t); + t.reserve(reserve_size); + } +} +BENCHMARK(BM_ReserveIntTable)->Range(128, 4096); + +void BM_ReserveStringTable(benchmark::State& state) { + int reserve_size = state.range(0); + for (auto _ : state) { + state.PauseTiming(); + StringTable t; + state.ResumeTiming(); + benchmark::DoNotOptimize(t); + t.reserve(reserve_size); + } +} +BENCHMARK(BM_ReserveStringTable)->Range(128, 4096); + +// Like std::iota, except that ctrl_t doesn't support operator++. +template <typename CtrlIter> +void Iota(CtrlIter begin, CtrlIter end, int value) { + for (; begin != end; ++begin, ++value) { + *begin = static_cast<ctrl_t>(value); + } +} + +void BM_Group_Match(benchmark::State& state) { + std::array<ctrl_t, Group::kWidth> group; + Iota(group.begin(), group.end(), -4); + Group g{group.data()}; + h2_t h = 1; + for (auto _ : state) { + ::benchmark::DoNotOptimize(h); + ::benchmark::DoNotOptimize(g.Match(h)); + } +} +BENCHMARK(BM_Group_Match); + +void BM_Group_MatchEmpty(benchmark::State& state) { + std::array<ctrl_t, Group::kWidth> group; + Iota(group.begin(), group.end(), -4); + Group g{group.data()}; + for (auto _ : state) ::benchmark::DoNotOptimize(g.MatchEmpty()); +} +BENCHMARK(BM_Group_MatchEmpty); + +void BM_Group_MatchEmptyOrDeleted(benchmark::State& state) { + std::array<ctrl_t, Group::kWidth> group; + Iota(group.begin(), group.end(), -4); + Group g{group.data()}; + for (auto _ : state) ::benchmark::DoNotOptimize(g.MatchEmptyOrDeleted()); +} +BENCHMARK(BM_Group_MatchEmptyOrDeleted); + +void BM_Group_CountLeadingEmptyOrDeleted(benchmark::State& state) { + std::array<ctrl_t, Group::kWidth> group; + Iota(group.begin(), group.end(), -2); + Group g{group.data()}; + for (auto _ : state) + ::benchmark::DoNotOptimize(g.CountLeadingEmptyOrDeleted()); +} +BENCHMARK(BM_Group_CountLeadingEmptyOrDeleted); + +void BM_Group_MatchFirstEmptyOrDeleted(benchmark::State& state) { + std::array<ctrl_t, Group::kWidth> group; + Iota(group.begin(), group.end(), -2); + Group g{group.data()}; + for (auto _ : state) ::benchmark::DoNotOptimize(*g.MatchEmptyOrDeleted()); +} +BENCHMARK(BM_Group_MatchFirstEmptyOrDeleted); + +void BM_DropDeletes(benchmark::State& state) { + constexpr size_t capacity = (1 << 20) - 1; + std::vector<ctrl_t> ctrl(capacity + 1 + Group::kWidth); + ctrl[capacity] = ctrl_t::kSentinel; + std::vector<ctrl_t> pattern = {ctrl_t::kEmpty, static_cast<ctrl_t>(2), + ctrl_t::kDeleted, static_cast<ctrl_t>(2), + ctrl_t::kEmpty, static_cast<ctrl_t>(1), + ctrl_t::kDeleted}; + for (size_t i = 0; i != capacity; ++i) { + ctrl[i] = pattern[i % pattern.size()]; + } + while (state.KeepRunning()) { + state.PauseTiming(); + std::vector<ctrl_t> ctrl_copy = ctrl; + state.ResumeTiming(); + ConvertDeletedToEmptyAndFullToDeleted(ctrl_copy.data(), capacity); + ::benchmark::DoNotOptimize(ctrl_copy[capacity]); + } +} +BENCHMARK(BM_DropDeletes); + +} // namespace +} // namespace container_internal +ABSL_NAMESPACE_END +} // namespace absl + +// These methods are here to make it easy to examine the assembly for targeted +// parts of the API. +auto CodegenAbslRawHashSetInt64Find(absl::container_internal::IntTable* table, + int64_t key) -> decltype(table->find(key)) { + return table->find(key); +} + +bool CodegenAbslRawHashSetInt64FindNeEnd( + absl::container_internal::IntTable* table, int64_t key) { + return table->find(key) != table->end(); +} + +auto CodegenAbslRawHashSetInt64Insert(absl::container_internal::IntTable* table, + int64_t key) + -> decltype(table->insert(key)) { + return table->insert(key); +} + +bool CodegenAbslRawHashSetInt64Contains( + absl::container_internal::IntTable* table, int64_t key) { + return table->contains(key); +} + +void CodegenAbslRawHashSetInt64Iterate( + absl::container_internal::IntTable* table) { + for (auto x : *table) benchmark::DoNotOptimize(x); +} + +int odr = + (::benchmark::DoNotOptimize(std::make_tuple( + &CodegenAbslRawHashSetInt64Find, &CodegenAbslRawHashSetInt64FindNeEnd, + &CodegenAbslRawHashSetInt64Insert, + &CodegenAbslRawHashSetInt64Contains, + &CodegenAbslRawHashSetInt64Iterate)), + 1); diff --git a/third_party/abseil-cpp/absl/container/internal/raw_hash_set_probe_benchmark.cc b/third_party/abseil-cpp/absl/container/internal/raw_hash_set_probe_benchmark.cc new file mode 100644 index 0000000000..7169a2e206 --- /dev/null +++ b/third_party/abseil-cpp/absl/container/internal/raw_hash_set_probe_benchmark.cc @@ -0,0 +1,590 @@ +// 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 +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. +// +// Generates probe length statistics for many combinations of key types and key +// distributions, all using the default hash function for swisstable. + +#include <memory> +#include <regex> // NOLINT +#include <vector> + +#include "absl/container/flat_hash_map.h" +#include "absl/container/internal/hash_function_defaults.h" +#include "absl/container/internal/hashtable_debug.h" +#include "absl/container/internal/raw_hash_set.h" +#include "absl/random/distributions.h" +#include "absl/random/random.h" +#include "absl/strings/str_cat.h" +#include "absl/strings/str_format.h" +#include "absl/strings/string_view.h" +#include "absl/strings/strip.h" + +namespace { + +enum class OutputStyle { kRegular, kBenchmark }; + +// The --benchmark command line flag. +// This is populated from main(). +// When run in "benchmark" mode, we have different output. This allows +// A/B comparisons with tools like `benchy`. +absl::string_view benchmarks; + +OutputStyle output() { + return !benchmarks.empty() ? OutputStyle::kBenchmark : OutputStyle::kRegular; +} + +template <class T> +struct Policy { + using slot_type = T; + using key_type = T; + using init_type = T; + + template <class allocator_type, class Arg> + static void construct(allocator_type* alloc, slot_type* slot, + const Arg& arg) { + std::allocator_traits<allocator_type>::construct(*alloc, slot, arg); + } + + template <class allocator_type> + static void destroy(allocator_type* alloc, slot_type* slot) { + std::allocator_traits<allocator_type>::destroy(*alloc, slot); + } + + static slot_type& element(slot_type* slot) { return *slot; } + + template <class F, class... Args> + static auto apply(F&& f, const slot_type& arg) + -> decltype(std::forward<F>(f)(arg, arg)) { + return std::forward<F>(f)(arg, arg); + } +}; + +absl::BitGen& GlobalBitGen() { + static auto* value = new absl::BitGen; + return *value; +} + +// Keeps a pool of allocations and randomly gives one out. +// This introduces more randomization to the addresses given to swisstable and +// should help smooth out this factor from probe length calculation. +template <class T> +class RandomizedAllocator { + public: + using value_type = T; + + RandomizedAllocator() = default; + template <typename U> + RandomizedAllocator(RandomizedAllocator<U>) {} // NOLINT + + static T* allocate(size_t n) { + auto& pointers = GetPointers(n); + // Fill the pool + while (pointers.size() < kRandomPool) { + pointers.push_back(std::allocator<T>{}.allocate(n)); + } + + // Choose a random one. + size_t i = absl::Uniform<size_t>(GlobalBitGen(), 0, pointers.size()); + T* result = pointers[i]; + pointers[i] = pointers.back(); + pointers.pop_back(); + return result; + } + + static void deallocate(T* p, size_t n) { + // Just put it back on the pool. No need to release the memory. + GetPointers(n).push_back(p); + } + + private: + // We keep at least kRandomPool allocations for each size. + static constexpr size_t kRandomPool = 20; + + static std::vector<T*>& GetPointers(size_t n) { + static auto* m = new absl::flat_hash_map<size_t, std::vector<T*>>(); + return (*m)[n]; + } +}; + +template <class T> +struct DefaultHash { + using type = absl::container_internal::hash_default_hash<T>; +}; + +template <class T> +using DefaultHashT = typename DefaultHash<T>::type; + +template <class T> +struct Table : absl::container_internal::raw_hash_set< + Policy<T>, DefaultHashT<T>, + absl::container_internal::hash_default_eq<T>, + RandomizedAllocator<T>> {}; + +struct LoadSizes { + size_t min_load; + size_t max_load; +}; + +LoadSizes GetMinMaxLoadSizes() { + static const auto sizes = [] { + Table<int> t; + + // First, fill enough to have a good distribution. + constexpr size_t kMinSize = 10000; + while (t.size() < kMinSize) t.insert(t.size()); + + const auto reach_min_load_factor = [&] { + const double lf = t.load_factor(); + while (lf <= t.load_factor()) t.insert(t.size()); + }; + + // Then, insert until we reach min load factor. + reach_min_load_factor(); + const size_t min_load_size = t.size(); + + // Keep going until we hit min load factor again, then go back one. + t.insert(t.size()); + reach_min_load_factor(); + + return LoadSizes{min_load_size, t.size() - 1}; + }(); + return sizes; +} + +struct Ratios { + double min_load; + double avg_load; + double max_load; +}; + +// See absl/container/internal/hashtable_debug.h for details on +// probe length calculation. +template <class ElemFn> +Ratios CollectMeanProbeLengths() { + const auto min_max_sizes = GetMinMaxLoadSizes(); + + ElemFn elem; + using Key = decltype(elem()); + Table<Key> t; + + Ratios result; + while (t.size() < min_max_sizes.min_load) t.insert(elem()); + result.min_load = + absl::container_internal::GetHashtableDebugProbeSummary(t).mean; + + while (t.size() < (min_max_sizes.min_load + min_max_sizes.max_load) / 2) + t.insert(elem()); + result.avg_load = + absl::container_internal::GetHashtableDebugProbeSummary(t).mean; + + while (t.size() < min_max_sizes.max_load) t.insert(elem()); + result.max_load = + absl::container_internal::GetHashtableDebugProbeSummary(t).mean; + + return result; +} + +template <int Align> +uintptr_t PointerForAlignment() { + alignas(Align) static constexpr uintptr_t kInitPointer = 0; + return reinterpret_cast<uintptr_t>(&kInitPointer); +} + +// This incomplete type is used for testing hash of pointers of different +// alignments. +// NOTE: We are generating invalid pointer values on the fly with +// reinterpret_cast. There are not "safely derived" pointers so using them is +// technically UB. It is unlikely to be a problem, though. +template <int Align> +struct Ptr; + +template <int Align> +Ptr<Align>* MakePtr(uintptr_t v) { + if (sizeof(v) == 8) { + constexpr int kCopyBits = 16; + // Ensure high bits are all the same. + v = static_cast<uintptr_t>(static_cast<intptr_t>(v << kCopyBits) >> + kCopyBits); + } + return reinterpret_cast<Ptr<Align>*>(v); +} + +struct IntIdentity { + uint64_t i; + friend bool operator==(IntIdentity a, IntIdentity b) { return a.i == b.i; } + IntIdentity operator++(int) { return IntIdentity{i++}; } +}; + +template <int Align> +struct PtrIdentity { + explicit PtrIdentity(uintptr_t val = PointerForAlignment<Align>()) : i(val) {} + uintptr_t i; + friend bool operator==(PtrIdentity a, PtrIdentity b) { return a.i == b.i; } + PtrIdentity operator++(int) { + PtrIdentity p(i); + i += Align; + return p; + } +}; + +constexpr char kStringFormat[] = "/path/to/file/name-%07d-of-9999999.txt"; + +template <bool small> +struct String { + std::string value; + static std::string Make(uint32_t v) { + return {small ? absl::StrCat(v) : absl::StrFormat(kStringFormat, v)}; + } +}; + +template <> +struct DefaultHash<IntIdentity> { + struct type { + size_t operator()(IntIdentity t) const { return t.i; } + }; +}; + +template <int Align> +struct DefaultHash<PtrIdentity<Align>> { + struct type { + size_t operator()(PtrIdentity<Align> t) const { return t.i; } + }; +}; + +template <class T> +struct Sequential { + T operator()() const { return current++; } + mutable T current{}; +}; + +template <int Align> +struct Sequential<Ptr<Align>*> { + Ptr<Align>* operator()() const { + auto* result = MakePtr<Align>(current); + current += Align; + return result; + } + mutable uintptr_t current = PointerForAlignment<Align>(); +}; + + +template <bool small> +struct Sequential<String<small>> { + std::string operator()() const { return String<small>::Make(current++); } + mutable uint32_t current = 0; +}; + +template <class T, class U> +struct Sequential<std::pair<T, U>> { + mutable Sequential<T> tseq; + mutable Sequential<U> useq; + + using RealT = decltype(tseq()); + using RealU = decltype(useq()); + + mutable std::vector<RealT> ts; + mutable std::vector<RealU> us; + mutable size_t ti = 0, ui = 0; + + std::pair<RealT, RealU> operator()() const { + std::pair<RealT, RealU> value{get_t(), get_u()}; + if (ti == 0) { + ti = ui + 1; + ui = 0; + } else { + --ti; + ++ui; + } + return value; + } + + RealT get_t() const { + while (ti >= ts.size()) ts.push_back(tseq()); + return ts[ti]; + } + + RealU get_u() const { + while (ui >= us.size()) us.push_back(useq()); + return us[ui]; + } +}; + +template <class T, int percent_skip> +struct AlmostSequential { + mutable Sequential<T> current; + + auto operator()() const -> decltype(current()) { + while (absl::Uniform(GlobalBitGen(), 0.0, 1.0) <= percent_skip / 100.) + current(); + return current(); + } +}; + +struct Uniform { + template <typename T> + T operator()(T) const { + return absl::Uniform<T>(absl::IntervalClosed, GlobalBitGen(), T{0}, ~T{0}); + } +}; + +struct Gaussian { + template <typename T> + T operator()(T) const { + double d; + do { + d = absl::Gaussian<double>(GlobalBitGen(), 1e6, 1e4); + } while (d <= 0 || d > std::numeric_limits<T>::max() / 2); + return static_cast<T>(d); + } +}; + +struct Zipf { + template <typename T> + T operator()(T) const { + return absl::Zipf<T>(GlobalBitGen(), std::numeric_limits<T>::max(), 1.6); + } +}; + +template <class T, class Dist> +struct Random { + T operator()() const { return Dist{}(T{}); } +}; + +template <class Dist, int Align> +struct Random<Ptr<Align>*, Dist> { + Ptr<Align>* operator()() const { + return MakePtr<Align>(Random<uintptr_t, Dist>{}() * Align); + } +}; + +template <class Dist> +struct Random<IntIdentity, Dist> { + IntIdentity operator()() const { + return IntIdentity{Random<uint64_t, Dist>{}()}; + } +}; + +template <class Dist, int Align> +struct Random<PtrIdentity<Align>, Dist> { + PtrIdentity<Align> operator()() const { + return PtrIdentity<Align>{Random<uintptr_t, Dist>{}() * Align}; + } +}; + +template <class Dist, bool small> +struct Random<String<small>, Dist> { + std::string operator()() const { + return String<small>::Make(Random<uint32_t, Dist>{}()); + } +}; + +template <class T, class U, class Dist> +struct Random<std::pair<T, U>, Dist> { + auto operator()() const + -> decltype(std::make_pair(Random<T, Dist>{}(), Random<U, Dist>{}())) { + return std::make_pair(Random<T, Dist>{}(), Random<U, Dist>{}()); + } +}; + +template <typename> +std::string Name(); + +std::string Name(uint32_t*) { return "u32"; } +std::string Name(uint64_t*) { return "u64"; } +std::string Name(IntIdentity*) { return "IntIdentity"; } + +template <int Align> +std::string Name(Ptr<Align>**) { + return absl::StrCat("Ptr", Align); +} + +template <int Align> +std::string Name(PtrIdentity<Align>*) { + return absl::StrCat("PtrIdentity", Align); +} + +template <bool small> +std::string Name(String<small>*) { + return small ? "StrS" : "StrL"; +} + +template <class T, class U> +std::string Name(std::pair<T, U>*) { + if (output() == OutputStyle::kBenchmark) + return absl::StrCat("P_", Name<T>(), "_", Name<U>()); + return absl::StrCat("P<", Name<T>(), ",", Name<U>(), ">"); +} + +template <class T> +std::string Name(Sequential<T>*) { + return "Sequential"; +} + +template <class T, int P> +std::string Name(AlmostSequential<T, P>*) { + return absl::StrCat("AlmostSeq_", P); +} + +template <class T> +std::string Name(Random<T, Uniform>*) { + return "UnifRand"; +} + +template <class T> +std::string Name(Random<T, Gaussian>*) { + return "GausRand"; +} + +template <class T> +std::string Name(Random<T, Zipf>*) { + return "ZipfRand"; +} + +template <typename T> +std::string Name() { + return Name(static_cast<T*>(nullptr)); +} + +constexpr int kNameWidth = 15; +constexpr int kDistWidth = 16; + +bool CanRunBenchmark(absl::string_view name) { + static std::regex* const filter = []() -> std::regex* { + return benchmarks.empty() || benchmarks == "all" + ? nullptr + : new std::regex(std::string(benchmarks)); + }(); + return filter == nullptr || std::regex_search(std::string(name), *filter); +} + +struct Result { + std::string name; + std::string dist_name; + Ratios ratios; +}; + +template <typename T, typename Dist> +void RunForTypeAndDistribution(std::vector<Result>& results) { + std::string name = absl::StrCat(Name<T>(), "/", Name<Dist>()); + // We have to check against all three names (min/avg/max) before we run it. + // If any of them is enabled, we run it. + if (!CanRunBenchmark(absl::StrCat(name, "/min")) && + !CanRunBenchmark(absl::StrCat(name, "/avg")) && + !CanRunBenchmark(absl::StrCat(name, "/max"))) { + return; + } + results.push_back({Name<T>(), Name<Dist>(), CollectMeanProbeLengths<Dist>()}); +} + +template <class T> +void RunForType(std::vector<Result>& results) { + RunForTypeAndDistribution<T, Sequential<T>>(results); + RunForTypeAndDistribution<T, AlmostSequential<T, 20>>(results); + RunForTypeAndDistribution<T, AlmostSequential<T, 50>>(results); + RunForTypeAndDistribution<T, Random<T, Uniform>>(results); +#ifdef NDEBUG + // Disable these in non-opt mode because they take too long. + RunForTypeAndDistribution<T, Random<T, Gaussian>>(results); + RunForTypeAndDistribution<T, Random<T, Zipf>>(results); +#endif // NDEBUG +} + +} // namespace + +int main(int argc, char** argv) { + // Parse the benchmark flags. Ignore all of them except the regex pattern. + for (int i = 1; i < argc; ++i) { + absl::string_view arg = argv[i]; + const auto next = [&] { return argv[std::min(i + 1, argc - 1)]; }; + + if (absl::ConsumePrefix(&arg, "--benchmark_filter")) { + if (arg == "") { + // --benchmark_filter X + benchmarks = next(); + } else if (absl::ConsumePrefix(&arg, "=")) { + // --benchmark_filter=X + benchmarks = arg; + } + } + + // Any --benchmark flag turns on the mode. + if (absl::ConsumePrefix(&arg, "--benchmark")) { + if (benchmarks.empty()) benchmarks="all"; + } + } + + std::vector<Result> results; + RunForType<uint64_t>(results); + RunForType<IntIdentity>(results); + RunForType<Ptr<8>*>(results); + RunForType<Ptr<16>*>(results); + RunForType<Ptr<32>*>(results); + RunForType<Ptr<64>*>(results); + RunForType<PtrIdentity<8>>(results); + RunForType<PtrIdentity<16>>(results); + RunForType<PtrIdentity<32>>(results); + RunForType<PtrIdentity<64>>(results); + RunForType<std::pair<uint32_t, uint32_t>>(results); + RunForType<String<true>>(results); + RunForType<String<false>>(results); + RunForType<std::pair<uint64_t, String<true>>>(results); + RunForType<std::pair<String<true>, uint64_t>>(results); + RunForType<std::pair<uint64_t, String<false>>>(results); + RunForType<std::pair<String<false>, uint64_t>>(results); + + switch (output()) { + case OutputStyle::kRegular: + absl::PrintF("%-*s%-*s Min Avg Max\n%s\n", kNameWidth, + "Type", kDistWidth, "Distribution", + std::string(kNameWidth + kDistWidth + 10 * 3, '-')); + for (const auto& result : results) { + absl::PrintF("%-*s%-*s %8.4f %8.4f %8.4f\n", kNameWidth, result.name, + kDistWidth, result.dist_name, result.ratios.min_load, + result.ratios.avg_load, result.ratios.max_load); + } + break; + case OutputStyle::kBenchmark: { + absl::PrintF("{\n"); + absl::PrintF(" \"benchmarks\": [\n"); + absl::string_view comma; + for (const auto& result : results) { + auto print = [&](absl::string_view stat, double Ratios::*val) { + std::string name = + absl::StrCat(result.name, "/", result.dist_name, "/", stat); + // Check the regex again. We might had have enabled only one of the + // stats for the benchmark. + if (!CanRunBenchmark(name)) return; + absl::PrintF(" %s{\n", comma); + absl::PrintF(" \"cpu_time\": %f,\n", 1e9 * result.ratios.*val); + absl::PrintF(" \"real_time\": %f,\n", 1e9 * result.ratios.*val); + absl::PrintF(" \"iterations\": 1,\n"); + absl::PrintF(" \"name\": \"%s\",\n", name); + absl::PrintF(" \"time_unit\": \"ns\"\n"); + absl::PrintF(" }\n"); + comma = ","; + }; + print("min", &Ratios::min_load); + print("avg", &Ratios::avg_load); + print("max", &Ratios::max_load); + } + absl::PrintF(" ],\n"); + absl::PrintF(" \"context\": {\n"); + absl::PrintF(" }\n"); + absl::PrintF("}\n"); + break; + } + } + + return 0; +} diff --git a/third_party/abseil-cpp/absl/container/internal/raw_hash_set_test.cc b/third_party/abseil-cpp/absl/container/internal/raw_hash_set_test.cc index a96ae68ac7..362b3caec3 100644 --- a/third_party/abseil-cpp/absl/container/internal/raw_hash_set_test.cc +++ b/third_party/abseil-cpp/absl/container/internal/raw_hash_set_test.cc @@ -14,6 +14,7 @@ #include "absl/container/internal/raw_hash_set.h" +#include <atomic> #include <cmath> #include <cstdint> #include <deque> @@ -22,10 +23,13 @@ #include <numeric> #include <random> #include <string> +#include <unordered_map> +#include <unordered_set> #include "gmock/gmock.h" #include "gtest/gtest.h" #include "absl/base/attributes.h" +#include "absl/base/config.h" #include "absl/base/internal/cycleclock.h" #include "absl/base/internal/raw_logging.h" #include "absl/container/internal/container_memory.h" @@ -47,14 +51,16 @@ struct RawHashSetTestOnlyAccess { namespace { -using ::testing::DoubleNear; using ::testing::ElementsAre; +using ::testing::Eq; using ::testing::Ge; using ::testing::Lt; -using ::testing::Optional; using ::testing::Pair; using ::testing::UnorderedElementsAre; +// Convenience function to static cast to ctrl_t. +ctrl_t CtrlT(int i) { return static_cast<ctrl_t>(i); } + TEST(Util, NormalizeCapacity) { EXPECT_EQ(1, NormalizeCapacity(0)); EXPECT_EQ(1, NormalizeCapacity(1)); @@ -74,8 +80,14 @@ TEST(Util, GrowthAndCapacity) { for (size_t growth = 0; growth < 10000; ++growth) { SCOPED_TRACE(growth); size_t capacity = NormalizeCapacity(GrowthToLowerboundCapacity(growth)); - // The capacity is large enough for `growth` + // The capacity is large enough for `growth`. EXPECT_THAT(CapacityToGrowth(capacity), Ge(growth)); + // For (capacity+1) < kWidth, growth should equal capacity. + if (capacity + 1 < Group::kWidth) { + EXPECT_THAT(CapacityToGrowth(capacity), Eq(capacity)); + } else { + EXPECT_THAT(CapacityToGrowth(capacity), Lt(capacity)); + } if (growth != 0 && capacity > 1) { // There is no smaller capacity that works. EXPECT_THAT(CapacityToGrowth(capacity / 2), Lt(growth)); @@ -161,15 +173,19 @@ TEST(Group, EmptyGroup) { TEST(Group, Match) { if (Group::kWidth == 16) { - ctrl_t group[] = {kEmpty, 1, kDeleted, 3, kEmpty, 5, kSentinel, 7, - 7, 5, 3, 1, 1, 1, 1, 1}; + ctrl_t group[] = {ctrl_t::kEmpty, CtrlT(1), ctrl_t::kDeleted, CtrlT(3), + ctrl_t::kEmpty, CtrlT(5), ctrl_t::kSentinel, CtrlT(7), + CtrlT(7), CtrlT(5), CtrlT(3), CtrlT(1), + CtrlT(1), CtrlT(1), CtrlT(1), CtrlT(1)}; EXPECT_THAT(Group{group}.Match(0), ElementsAre()); EXPECT_THAT(Group{group}.Match(1), ElementsAre(1, 11, 12, 13, 14, 15)); EXPECT_THAT(Group{group}.Match(3), ElementsAre(3, 10)); EXPECT_THAT(Group{group}.Match(5), ElementsAre(5, 9)); EXPECT_THAT(Group{group}.Match(7), ElementsAre(7, 8)); } else if (Group::kWidth == 8) { - ctrl_t group[] = {kEmpty, 1, 2, kDeleted, 2, 1, kSentinel, 1}; + ctrl_t group[] = {ctrl_t::kEmpty, CtrlT(1), CtrlT(2), + ctrl_t::kDeleted, CtrlT(2), CtrlT(1), + ctrl_t::kSentinel, CtrlT(1)}; EXPECT_THAT(Group{group}.Match(0), ElementsAre()); EXPECT_THAT(Group{group}.Match(1), ElementsAre(1, 5, 7)); EXPECT_THAT(Group{group}.Match(2), ElementsAre(2, 4)); @@ -180,11 +196,15 @@ TEST(Group, Match) { TEST(Group, MatchEmpty) { if (Group::kWidth == 16) { - ctrl_t group[] = {kEmpty, 1, kDeleted, 3, kEmpty, 5, kSentinel, 7, - 7, 5, 3, 1, 1, 1, 1, 1}; + ctrl_t group[] = {ctrl_t::kEmpty, CtrlT(1), ctrl_t::kDeleted, CtrlT(3), + ctrl_t::kEmpty, CtrlT(5), ctrl_t::kSentinel, CtrlT(7), + CtrlT(7), CtrlT(5), CtrlT(3), CtrlT(1), + CtrlT(1), CtrlT(1), CtrlT(1), CtrlT(1)}; EXPECT_THAT(Group{group}.MatchEmpty(), ElementsAre(0, 4)); } else if (Group::kWidth == 8) { - ctrl_t group[] = {kEmpty, 1, 2, kDeleted, 2, 1, kSentinel, 1}; + ctrl_t group[] = {ctrl_t::kEmpty, CtrlT(1), CtrlT(2), + ctrl_t::kDeleted, CtrlT(2), CtrlT(1), + ctrl_t::kSentinel, CtrlT(1)}; EXPECT_THAT(Group{group}.MatchEmpty(), ElementsAre(0)); } else { FAIL() << "No test coverage for Group::kWidth==" << Group::kWidth; @@ -193,11 +213,15 @@ TEST(Group, MatchEmpty) { TEST(Group, MatchEmptyOrDeleted) { if (Group::kWidth == 16) { - ctrl_t group[] = {kEmpty, 1, kDeleted, 3, kEmpty, 5, kSentinel, 7, - 7, 5, 3, 1, 1, 1, 1, 1}; + ctrl_t group[] = {ctrl_t::kEmpty, CtrlT(1), ctrl_t::kDeleted, CtrlT(3), + ctrl_t::kEmpty, CtrlT(5), ctrl_t::kSentinel, CtrlT(7), + CtrlT(7), CtrlT(5), CtrlT(3), CtrlT(1), + CtrlT(1), CtrlT(1), CtrlT(1), CtrlT(1)}; EXPECT_THAT(Group{group}.MatchEmptyOrDeleted(), ElementsAre(0, 2, 4)); } else if (Group::kWidth == 8) { - ctrl_t group[] = {kEmpty, 1, 2, kDeleted, 2, 1, kSentinel, 1}; + ctrl_t group[] = {ctrl_t::kEmpty, CtrlT(1), CtrlT(2), + ctrl_t::kDeleted, CtrlT(2), CtrlT(1), + ctrl_t::kSentinel, CtrlT(1)}; EXPECT_THAT(Group{group}.MatchEmptyOrDeleted(), ElementsAre(0, 3)); } else { FAIL() << "No test coverage for Group::kWidth==" << Group::kWidth; @@ -208,28 +232,32 @@ TEST(Batch, DropDeletes) { constexpr size_t kCapacity = 63; constexpr size_t kGroupWidth = container_internal::Group::kWidth; std::vector<ctrl_t> ctrl(kCapacity + 1 + kGroupWidth); - ctrl[kCapacity] = kSentinel; - std::vector<ctrl_t> pattern = {kEmpty, 2, kDeleted, 2, kEmpty, 1, kDeleted}; + ctrl[kCapacity] = ctrl_t::kSentinel; + std::vector<ctrl_t> pattern = { + ctrl_t::kEmpty, CtrlT(2), ctrl_t::kDeleted, CtrlT(2), + ctrl_t::kEmpty, CtrlT(1), ctrl_t::kDeleted}; for (size_t i = 0; i != kCapacity; ++i) { ctrl[i] = pattern[i % pattern.size()]; if (i < kGroupWidth - 1) ctrl[i + kCapacity + 1] = pattern[i % pattern.size()]; } ConvertDeletedToEmptyAndFullToDeleted(ctrl.data(), kCapacity); - ASSERT_EQ(ctrl[kCapacity], kSentinel); - for (size_t i = 0; i < kCapacity + 1 + kGroupWidth; ++i) { + ASSERT_EQ(ctrl[kCapacity], ctrl_t::kSentinel); + for (size_t i = 0; i < kCapacity + kGroupWidth; ++i) { ctrl_t expected = pattern[i % (kCapacity + 1) % pattern.size()]; - if (i == kCapacity) expected = kSentinel; - if (expected == kDeleted) expected = kEmpty; - if (IsFull(expected)) expected = kDeleted; + if (i == kCapacity) expected = ctrl_t::kSentinel; + if (expected == ctrl_t::kDeleted) expected = ctrl_t::kEmpty; + if (IsFull(expected)) expected = ctrl_t::kDeleted; EXPECT_EQ(ctrl[i], expected) - << i << " " << int{pattern[i % pattern.size()]}; + << i << " " << static_cast<int>(pattern[i % pattern.size()]); } } TEST(Group, CountLeadingEmptyOrDeleted) { - const std::vector<ctrl_t> empty_examples = {kEmpty, kDeleted}; - const std::vector<ctrl_t> full_examples = {0, 1, 2, 3, 5, 9, 127, kSentinel}; + const std::vector<ctrl_t> empty_examples = {ctrl_t::kEmpty, ctrl_t::kDeleted}; + const std::vector<ctrl_t> full_examples = { + CtrlT(0), CtrlT(1), CtrlT(2), CtrlT(3), + CtrlT(5), CtrlT(9), CtrlT(127), ctrl_t::kSentinel}; for (ctrl_t empty : empty_examples) { std::vector<ctrl_t> e(Group::kWidth, empty); @@ -249,25 +277,44 @@ TEST(Group, CountLeadingEmptyOrDeleted) { } } -struct IntPolicy { - using slot_type = int64_t; - using key_type = int64_t; - using init_type = int64_t; +template <class T> +struct ValuePolicy { + using slot_type = T; + using key_type = T; + using init_type = T; - static void construct(void*, int64_t* slot, int64_t v) { *slot = v; } - static void destroy(void*, int64_t*) {} - static void transfer(void*, int64_t* new_slot, int64_t* old_slot) { - *new_slot = *old_slot; + template <class Allocator, class... Args> + static void construct(Allocator* alloc, slot_type* slot, Args&&... args) { + absl::allocator_traits<Allocator>::construct(*alloc, slot, + std::forward<Args>(args)...); } - static int64_t& element(slot_type* slot) { return *slot; } + template <class Allocator> + static void destroy(Allocator* alloc, slot_type* slot) { + absl::allocator_traits<Allocator>::destroy(*alloc, slot); + } - template <class F> - static auto apply(F&& f, int64_t x) -> decltype(std::forward<F>(f)(x, x)) { - return std::forward<F>(f)(x, x); + template <class Allocator> + static void transfer(Allocator* alloc, slot_type* new_slot, + slot_type* old_slot) { + construct(alloc, new_slot, std::move(*old_slot)); + destroy(alloc, old_slot); + } + + static T& element(slot_type* slot) { return *slot; } + + template <class F, class... Args> + static decltype(absl::container_internal::DecomposeValue( + std::declval<F>(), std::declval<Args>()...)) + apply(F&& f, Args&&... args) { + return absl::container_internal::DecomposeValue( + std::forward<F>(f), std::forward<Args>(args)...); } }; +using IntPolicy = ValuePolicy<int64_t>; +using Uint8Policy = ValuePolicy<uint8_t>; + class StringPolicy { template <class F, class K, class V, class = typename std::enable_if< @@ -347,6 +394,13 @@ struct IntTable using Base::Base; }; +struct Uint8Table + : raw_hash_set<Uint8Policy, container_internal::hash_default_hash<uint8_t>, + std::equal_to<uint8_t>, std::allocator<uint8_t>> { + using Base = typename Uint8Table::raw_hash_set; + using Base::Base; +}; + template <typename T> struct CustomAlloc : std::allocator<T> { CustomAlloc() {} @@ -392,6 +446,13 @@ TEST(Table, EmptyFunctorOptimization) { size_t growth_left; void* infoz; }; + struct MockTableInfozDisabled { + void* ctrl; + void* slots; + size_t size; + size_t capacity; + size_t growth_left; + }; struct StatelessHash { size_t operator()(absl::string_view) const { return 0; } }; @@ -399,17 +460,27 @@ TEST(Table, EmptyFunctorOptimization) { size_t dummy; }; - EXPECT_EQ( - sizeof(MockTable), - sizeof( - raw_hash_set<StringPolicy, StatelessHash, - std::equal_to<absl::string_view>, std::allocator<int>>)); + if (std::is_empty<HashtablezInfoHandle>::value) { + EXPECT_EQ(sizeof(MockTableInfozDisabled), + sizeof(raw_hash_set<StringPolicy, StatelessHash, + std::equal_to<absl::string_view>, + std::allocator<int>>)); - EXPECT_EQ( - sizeof(MockTable) + sizeof(StatefulHash), - sizeof( - raw_hash_set<StringPolicy, StatefulHash, - std::equal_to<absl::string_view>, std::allocator<int>>)); + EXPECT_EQ(sizeof(MockTableInfozDisabled) + sizeof(StatefulHash), + sizeof(raw_hash_set<StringPolicy, StatefulHash, + std::equal_to<absl::string_view>, + std::allocator<int>>)); + } else { + EXPECT_EQ(sizeof(MockTable), + sizeof(raw_hash_set<StringPolicy, StatelessHash, + std::equal_to<absl::string_view>, + std::allocator<int>>)); + + EXPECT_EQ(sizeof(MockTable) + sizeof(StatefulHash), + sizeof(raw_hash_set<StringPolicy, StatefulHash, + std::equal_to<absl::string_view>, + std::allocator<int>>)); + } } TEST(Table, Empty) { @@ -497,6 +568,37 @@ TEST(Table, InsertCollisionAndFindAfterDelete) { EXPECT_TRUE(t.empty()); } +TEST(Table, InsertWithinCapacity) { + IntTable t; + t.reserve(10); + const size_t original_capacity = t.capacity(); + const auto addr = [&](int i) { + return reinterpret_cast<uintptr_t>(&*t.find(i)); + }; + // Inserting an element does not change capacity. + t.insert(0); + EXPECT_THAT(t.capacity(), original_capacity); + const uintptr_t original_addr_0 = addr(0); + // Inserting another element does not rehash. + t.insert(1); + EXPECT_THAT(t.capacity(), original_capacity); + EXPECT_THAT(addr(0), original_addr_0); + // Inserting lots of duplicate elements does not rehash. + for (int i = 0; i < 100; ++i) { + t.insert(i % 10); + } + EXPECT_THAT(t.capacity(), original_capacity); + EXPECT_THAT(addr(0), original_addr_0); + // Inserting a range of duplicate elements does not rehash. + std::vector<int> dup_range; + for (int i = 0; i < 100; ++i) { + dup_range.push_back(i % 10); + } + t.insert(dup_range.begin(), dup_range.end()); + EXPECT_THAT(t.capacity(), original_capacity); + EXPECT_THAT(addr(0), original_addr_0); +} + TEST(Table, LazyEmplace) { StringTable t; bool called = false; @@ -544,28 +646,53 @@ TEST(Table, Contains2) { } int decompose_constructed; +int decompose_copy_constructed; +int decompose_copy_assigned; +int decompose_move_constructed; +int decompose_move_assigned; struct DecomposeType { - DecomposeType(int i) : i(i) { // NOLINT + DecomposeType(int i = 0) : i(i) { // NOLINT ++decompose_constructed; } explicit DecomposeType(const char* d) : DecomposeType(*d) {} + DecomposeType(const DecomposeType& other) : i(other.i) { + ++decompose_copy_constructed; + } + DecomposeType& operator=(const DecomposeType& other) { + ++decompose_copy_assigned; + i = other.i; + return *this; + } + DecomposeType(DecomposeType&& other) : i(other.i) { + ++decompose_move_constructed; + } + DecomposeType& operator=(DecomposeType&& other) { + ++decompose_move_assigned; + i = other.i; + return *this; + } + int i; }; struct DecomposeHash { using is_transparent = void; - size_t operator()(DecomposeType a) const { return a.i; } + size_t operator()(const DecomposeType& a) const { return a.i; } size_t operator()(int a) const { return a; } size_t operator()(const char* a) const { return *a; } }; struct DecomposeEq { using is_transparent = void; - bool operator()(DecomposeType a, DecomposeType b) const { return a.i == b.i; } - bool operator()(DecomposeType a, int b) const { return a.i == b; } - bool operator()(DecomposeType a, const char* b) const { return a.i == *b; } + bool operator()(const DecomposeType& a, const DecomposeType& b) const { + return a.i == b.i; + } + bool operator()(const DecomposeType& a, int b) const { return a.i == b; } + bool operator()(const DecomposeType& a, const char* b) const { + return a.i == *b; + } }; struct DecomposePolicy { @@ -575,9 +702,9 @@ struct DecomposePolicy { template <typename T> static void construct(void*, DecomposeType* slot, T&& v) { - *slot = DecomposeType(std::forward<T>(v)); + ::new (slot) DecomposeType(std::forward<T>(v)); } - static void destroy(void*, DecomposeType*) {} + static void destroy(void*, DecomposeType* slot) { slot->~DecomposeType(); } static DecomposeType& element(slot_type* slot) { return *slot; } template <class F, class T> @@ -592,8 +719,13 @@ void TestDecompose(bool construct_three) { const int one = 1; const char* three_p = "3"; const auto& three = three_p; + const int elem_vector_count = 256; + std::vector<DecomposeType> elem_vector(elem_vector_count, DecomposeType{0}); + std::iota(elem_vector.begin(), elem_vector.end(), 0); - raw_hash_set<DecomposePolicy, Hash, Eq, std::allocator<int>> set1; + using DecomposeSet = + raw_hash_set<DecomposePolicy, Hash, Eq, std::allocator<int>>; + DecomposeSet set1; decompose_constructed = 0; int expected_constructed = 0; @@ -651,20 +783,72 @@ void TestDecompose(bool construct_three) { expected_constructed += construct_three; EXPECT_EQ(expected_constructed, decompose_constructed); } + + decompose_copy_constructed = 0; + decompose_copy_assigned = 0; + decompose_move_constructed = 0; + decompose_move_assigned = 0; + int expected_copy_constructed = 0; + int expected_move_constructed = 0; + { // raw_hash_set(first, last) with random-access iterators + DecomposeSet set2(elem_vector.begin(), elem_vector.end()); + // Expect exactly one copy-constructor call for each element if no + // rehashing is done. + expected_copy_constructed += elem_vector_count; + EXPECT_EQ(expected_copy_constructed, decompose_copy_constructed); + EXPECT_EQ(expected_move_constructed, decompose_move_constructed); + EXPECT_EQ(0, decompose_move_assigned); + EXPECT_EQ(0, decompose_copy_assigned); + } + + { // raw_hash_set(first, last) with forward iterators + std::list<DecomposeType> elem_list(elem_vector.begin(), elem_vector.end()); + expected_copy_constructed = decompose_copy_constructed; + DecomposeSet set2(elem_list.begin(), elem_list.end()); + // Expect exactly N elements copied into set, expect at most 2*N elements + // moving internally for all resizing needed (for a growth factor of 2). + expected_copy_constructed += elem_vector_count; + EXPECT_EQ(expected_copy_constructed, decompose_copy_constructed); + expected_move_constructed += elem_vector_count; + EXPECT_LT(expected_move_constructed, decompose_move_constructed); + expected_move_constructed += elem_vector_count; + EXPECT_GE(expected_move_constructed, decompose_move_constructed); + EXPECT_EQ(0, decompose_move_assigned); + EXPECT_EQ(0, decompose_copy_assigned); + expected_copy_constructed = decompose_copy_constructed; + expected_move_constructed = decompose_move_constructed; + } + + { // insert(first, last) + DecomposeSet set2; + set2.insert(elem_vector.begin(), elem_vector.end()); + // Expect exactly N elements copied into set, expect at most 2*N elements + // moving internally for all resizing needed (for a growth factor of 2). + const int expected_new_elements = elem_vector_count; + const int expected_max_element_moves = 2 * elem_vector_count; + expected_copy_constructed += expected_new_elements; + EXPECT_EQ(expected_copy_constructed, decompose_copy_constructed); + expected_move_constructed += expected_max_element_moves; + EXPECT_GE(expected_move_constructed, decompose_move_constructed); + EXPECT_EQ(0, decompose_move_assigned); + EXPECT_EQ(0, decompose_copy_assigned); + expected_copy_constructed = decompose_copy_constructed; + expected_move_constructed = decompose_move_constructed; + } } TEST(Table, Decompose) { TestDecompose<DecomposeHash, DecomposeEq>(false); struct TransparentHashIntOverload { - size_t operator()(DecomposeType a) const { return a.i; } + size_t operator()(const DecomposeType& a) const { return a.i; } size_t operator()(int a) const { return a; } }; struct TransparentEqIntOverload { - bool operator()(DecomposeType a, DecomposeType b) const { + bool operator()(const DecomposeType& a, const DecomposeType& b) const { return a.i == b.i; } - bool operator()(DecomposeType a, int b) const { return a.i == b; } + bool operator()(const DecomposeType& a, int b) const { return a.i == b; } }; TestDecompose<TransparentHashIntOverload, DecomposeEq>(true); TestDecompose<TransparentHashIntOverload, TransparentEqIntOverload>(true); @@ -706,7 +890,7 @@ TEST(Table, RehashWithNoResize) { const size_t capacity = t.capacity(); // Remove elements from all groups except the first and the last one. - // All elements removed from full groups will be marked as kDeleted. + // All elements removed from full groups will be marked as ctrl_t::kDeleted. const size_t erase_begin = Group::kWidth / 2; const size_t erase_end = (t.size() / Group::kWidth - 1) * Group::kWidth; for (size_t i = erase_begin; i < erase_end; ++i) { @@ -846,7 +1030,8 @@ TEST(Table, EraseMaintainsValidIterator) { std::vector<int64_t> CollectBadMergeKeys(size_t N) { static constexpr int kGroupSize = Group::kWidth - 1; - auto topk_range = [](size_t b, size_t e, IntTable* t) -> std::vector<int64_t> { + auto topk_range = [](size_t b, size_t e, + IntTable* t) -> std::vector<int64_t> { for (size_t i = b; i != e; ++i) { t->emplace(i); } @@ -1000,8 +1185,8 @@ using ProbeStatsPerSize = std::map<size_t, ProbeStats>; // 1. Create new table and reserve it to keys.size() * 2 // 2. Insert all keys xored with seed // 3. Collect ProbeStats from final table. -ProbeStats CollectProbeStatsOnKeysXoredWithSeed(const std::vector<int64_t>& keys, - size_t num_iters) { +ProbeStats CollectProbeStatsOnKeysXoredWithSeed( + const std::vector<int64_t>& keys, size_t num_iters) { const size_t reserve_size = keys.size() * 2; ProbeStats stats; @@ -1655,6 +1840,38 @@ TEST(Table, Merge) { EXPECT_THAT(t2, UnorderedElementsAre(Pair("0", "~0"))); } +TEST(Table, IteratorEmplaceConstructibleRequirement) { + struct Value { + explicit Value(absl::string_view view) : value(view) {} + std::string value; + + bool operator==(const Value& other) const { return value == other.value; } + }; + struct H { + size_t operator()(const Value& v) const { + return absl::Hash<std::string>{}(v.value); + } + }; + + struct Table : raw_hash_set<ValuePolicy<Value>, H, std::equal_to<Value>, + std::allocator<Value>> { + using Base = typename Table::raw_hash_set; + using Base::Base; + }; + + std::string input[3]{"A", "B", "C"}; + + Table t(std::begin(input), std::end(input)); + EXPECT_THAT(t, UnorderedElementsAre(Value{"A"}, Value{"B"}, Value{"C"})); + + input[0] = "D"; + input[1] = "E"; + input[2] = "F"; + t.insert(std::begin(input), std::end(input)); + EXPECT_THAT(t, UnorderedElementsAre(Value{"A"}, Value{"B"}, Value{"C"}, + Value{"D"}, Value{"E"}, Value{"F"})); +} + TEST(Nodes, EmptyNodeType) { using node_type = StringTable::node_type; node_type n; @@ -1666,9 +1883,9 @@ TEST(Nodes, EmptyNodeType) { } TEST(Nodes, ExtractInsert) { - constexpr char k0[] = "Very long std::string zero."; - constexpr char k1[] = "Very long std::string one."; - constexpr char k2[] = "Very long std::string two."; + constexpr char k0[] = "Very long string zero."; + constexpr char k1[] = "Very long string one."; + constexpr char k2[] = "Very long string two."; StringTable t = {{k0, ""}, {k1, ""}, {k2, ""}}; EXPECT_THAT(t, UnorderedElementsAre(Pair(k0, ""), Pair(k1, ""), Pair(k2, ""))); @@ -1709,6 +1926,26 @@ TEST(Nodes, ExtractInsert) { EXPECT_FALSE(node); } +TEST(Nodes, HintInsert) { + IntTable t = {1, 2, 3}; + auto node = t.extract(1); + EXPECT_THAT(t, UnorderedElementsAre(2, 3)); + auto it = t.insert(t.begin(), std::move(node)); + EXPECT_THAT(t, UnorderedElementsAre(1, 2, 3)); + EXPECT_EQ(*it, 1); + EXPECT_FALSE(node); + + node = t.extract(2); + EXPECT_THAT(t, UnorderedElementsAre(1, 3)); + // reinsert 2 to make the next insert fail. + t.insert(2); + EXPECT_THAT(t, UnorderedElementsAre(1, 2, 3)); + it = t.insert(t.begin(), std::move(node)); + EXPECT_EQ(*it, 2); + // The node was not emptied by the insert call. + EXPECT_TRUE(node); +} + IntTable MakeSimpleTable(size_t size) { IntTable t; while (t.size() < size) t.insert(t.size()); @@ -1791,39 +2028,81 @@ TEST(TableDeathTest, EraseOfEndAsserts) { IntTable t; // Extra simple "regexp" as regexp support is highly varied across platforms. - constexpr char kDeathMsg[] = "IsFull"; + constexpr char kDeathMsg[] = "Invalid operation on iterator"; EXPECT_DEATH_IF_SUPPORTED(t.erase(t.end()), kDeathMsg); } -#if defined(ABSL_HASHTABLEZ_SAMPLE) +#if defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE) TEST(RawHashSamplerTest, Sample) { // Enable the feature even if the prod default is off. SetHashtablezEnabled(true); SetHashtablezSampleParameter(100); - auto& sampler = HashtablezSampler::Global(); + auto& sampler = GlobalHashtablezSampler(); size_t start_size = 0; - start_size += sampler.Iterate([&](const HashtablezInfo&) { ++start_size; }); + std::unordered_set<const HashtablezInfo*> preexisting_info; + start_size += sampler.Iterate([&](const HashtablezInfo& info) { + preexisting_info.insert(&info); + ++start_size; + }); std::vector<IntTable> tables; for (int i = 0; i < 1000000; ++i) { tables.emplace_back(); + + const bool do_reserve = (i % 10 > 5); + const bool do_rehash = !do_reserve && (i % 10 > 0); + + if (do_reserve) { + // Don't reserve on all tables. + tables.back().reserve(10 * (i % 10)); + } + tables.back().insert(1); + tables.back().insert(i % 5); + + if (do_rehash) { + // Rehash some other tables. + tables.back().rehash(10 * (i % 10)); + } } size_t end_size = 0; - end_size += sampler.Iterate([&](const HashtablezInfo&) { ++end_size; }); + std::unordered_map<size_t, int> observed_checksums; + std::unordered_map<ssize_t, int> reservations; + end_size += sampler.Iterate([&](const HashtablezInfo& info) { + if (preexisting_info.count(&info) == 0) { + observed_checksums[info.hashes_bitwise_xor.load( + std::memory_order_relaxed)]++; + reservations[info.max_reserve.load(std::memory_order_relaxed)]++; + } + EXPECT_EQ(info.inline_element_size, sizeof(int64_t)); + ++end_size; + }); EXPECT_NEAR((end_size - start_size) / static_cast<double>(tables.size()), 0.01, 0.005); + EXPECT_EQ(observed_checksums.size(), 5); + for (const auto& [_, count] : observed_checksums) { + EXPECT_NEAR((100 * count) / static_cast<double>(tables.size()), 0.2, 0.05); + } + + EXPECT_EQ(reservations.size(), 10); + for (const auto& [reservation, count] : reservations) { + EXPECT_GE(reservation, 0); + EXPECT_LT(reservation, 100); + + EXPECT_NEAR((100 * count) / static_cast<double>(tables.size()), 0.1, 0.05) + << reservation; + } } -#endif // ABSL_HASHTABLEZ_SAMPLER +#endif // ABSL_INTERNAL_HASHTABLEZ_SAMPLE TEST(RawHashSamplerTest, DoNotSampleCustomAllocators) { // Enable the feature even if the prod default is off. SetHashtablezEnabled(true); SetHashtablezSampleParameter(100); - auto& sampler = HashtablezSampler::Global(); + auto& sampler = GlobalHashtablezSampler(); size_t start_size = 0; start_size += sampler.Iterate([&](const HashtablezInfo&) { ++start_size; }); @@ -1839,7 +2118,7 @@ TEST(RawHashSamplerTest, DoNotSampleCustomAllocators) { 0.00, 0.001); } -#ifdef ADDRESS_SANITIZER +#ifdef ABSL_HAVE_ADDRESS_SANITIZER TEST(Sanitizer, PoisoningUnused) { IntTable t; t.reserve(5); @@ -1863,7 +2142,37 @@ TEST(Sanitizer, PoisoningOnErase) { t.erase(0); EXPECT_TRUE(__asan_address_is_poisoned(&v)); } -#endif // ADDRESS_SANITIZER +#endif // ABSL_HAVE_ADDRESS_SANITIZER + +TEST(Table, AlignOne) { + // We previously had a bug in which we were copying a control byte over the + // first slot when alignof(value_type) is 1. We test repeated + // insertions/erases and verify that the behavior is correct. + Uint8Table t; + std::unordered_set<uint8_t> verifier; // NOLINT + + // Do repeated insertions/erases from the table. + for (int64_t i = 0; i < 100000; ++i) { + SCOPED_TRACE(i); + const uint8_t u = (i * -i) & 0xFF; + auto it = t.find(u); + auto verifier_it = verifier.find(u); + if (it == t.end()) { + ASSERT_EQ(verifier_it, verifier.end()); + t.insert(u); + verifier.insert(u); + } else { + ASSERT_NE(verifier_it, verifier.end()); + t.erase(it); + verifier.erase(verifier_it); + } + } + + EXPECT_EQ(t.size(), verifier.size()); + for (uint8_t u : t) { + EXPECT_EQ(verifier.count(u), 1); + } +} } // namespace } // namespace container_internal diff --git a/third_party/abseil-cpp/absl/container/internal/unordered_map_constructor_test.h b/third_party/abseil-cpp/absl/container/internal/unordered_map_constructor_test.h index 76ee95e6ab..c1d20f3c52 100644 --- a/third_party/abseil-cpp/absl/container/internal/unordered_map_constructor_test.h +++ b/third_party/abseil-cpp/absl/container/internal/unordered_map_constructor_test.h @@ -16,6 +16,7 @@ #define ABSL_CONTAINER_INTERNAL_UNORDERED_MAP_CONSTRUCTOR_TEST_H_ #include <algorithm> +#include <unordered_map> #include <vector> #include "gmock/gmock.h" @@ -178,7 +179,7 @@ TYPED_TEST_P(ConstructorTest, InputIteratorBucketHashEqualAlloc) { A alloc(0); std::vector<T> values; std::generate_n(std::back_inserter(values), 10, - hash_internal::Generator<T>()); + hash_internal::UniqueGenerator<T>()); TypeParam m(values.begin(), values.end(), 123, hasher, equal, alloc); EXPECT_EQ(m.hash_function(), hasher); EXPECT_EQ(m.key_eq(), equal); @@ -197,7 +198,7 @@ void InputIteratorBucketAllocTest(std::true_type) { A alloc(0); std::vector<T> values; std::generate_n(std::back_inserter(values), 10, - hash_internal::Generator<T>()); + hash_internal::UniqueGenerator<T>()); TypeParam m(values.begin(), values.end(), 123, alloc); EXPECT_EQ(m.get_allocator(), alloc); EXPECT_THAT(items(m), ::testing::UnorderedElementsAreArray(values)); @@ -220,7 +221,7 @@ void InputIteratorBucketHashAllocTest(std::true_type) { A alloc(0); std::vector<T> values; std::generate_n(std::back_inserter(values), 10, - hash_internal::Generator<T>()); + hash_internal::UniqueGenerator<T>()); TypeParam m(values.begin(), values.end(), 123, hasher, alloc); EXPECT_EQ(m.hash_function(), hasher); EXPECT_EQ(m.get_allocator(), alloc); @@ -240,8 +241,9 @@ TYPED_TEST_P(ConstructorTest, CopyConstructor) { H hasher; E equal; A alloc(0); + hash_internal::UniqueGenerator<T> gen; TypeParam m(123, hasher, equal, alloc); - for (size_t i = 0; i != 10; ++i) m.insert(hash_internal::Generator<T>()()); + for (size_t i = 0; i != 10; ++i) m.insert(gen()); TypeParam n(m); EXPECT_EQ(m.hash_function(), n.hash_function()); EXPECT_EQ(m.key_eq(), n.key_eq()); @@ -261,8 +263,9 @@ void CopyConstructorAllocTest(std::true_type) { H hasher; E equal; A alloc(0); + hash_internal::UniqueGenerator<T> gen; TypeParam m(123, hasher, equal, alloc); - for (size_t i = 0; i != 10; ++i) m.insert(hash_internal::Generator<T>()()); + for (size_t i = 0; i != 10; ++i) m.insert(gen()); TypeParam n(m, A(11)); EXPECT_EQ(m.hash_function(), n.hash_function()); EXPECT_EQ(m.key_eq(), n.key_eq()); @@ -284,8 +287,9 @@ TYPED_TEST_P(ConstructorTest, MoveConstructor) { H hasher; E equal; A alloc(0); + hash_internal::UniqueGenerator<T> gen; TypeParam m(123, hasher, equal, alloc); - for (size_t i = 0; i != 10; ++i) m.insert(hash_internal::Generator<T>()()); + for (size_t i = 0; i != 10; ++i) m.insert(gen()); TypeParam t(m); TypeParam n(std::move(t)); EXPECT_EQ(m.hash_function(), n.hash_function()); @@ -306,8 +310,9 @@ void MoveConstructorAllocTest(std::true_type) { H hasher; E equal; A alloc(0); + hash_internal::UniqueGenerator<T> gen; TypeParam m(123, hasher, equal, alloc); - for (size_t i = 0; i != 10; ++i) m.insert(hash_internal::Generator<T>()()); + for (size_t i = 0; i != 10; ++i) m.insert(gen()); TypeParam t(m); TypeParam n(std::move(t), A(1)); EXPECT_EQ(m.hash_function(), n.hash_function()); @@ -324,7 +329,7 @@ TYPED_TEST_P(ConstructorTest, MoveConstructorAlloc) { TYPED_TEST_P(ConstructorTest, InitializerListBucketHashEqualAlloc) { using T = hash_internal::GeneratedType<TypeParam>; - hash_internal::Generator<T> gen; + hash_internal::UniqueGenerator<T> gen; std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()}; using H = typename TypeParam::hasher; using E = typename TypeParam::key_equal; @@ -347,7 +352,7 @@ template <typename TypeParam> void InitializerListBucketAllocTest(std::true_type) { using T = hash_internal::GeneratedType<TypeParam>; using A = typename TypeParam::allocator_type; - hash_internal::Generator<T> gen; + hash_internal::UniqueGenerator<T> gen; std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()}; A alloc(0); TypeParam m(values, 123, alloc); @@ -370,7 +375,7 @@ void InitializerListBucketHashAllocTest(std::true_type) { using A = typename TypeParam::allocator_type; H hasher; A alloc(0); - hash_internal::Generator<T> gen; + hash_internal::UniqueGenerator<T> gen; std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()}; TypeParam m(values, 123, hasher, alloc); EXPECT_EQ(m.hash_function(), hasher); @@ -391,7 +396,7 @@ TYPED_TEST_P(ConstructorTest, Assignment) { H hasher; E equal; A alloc(0); - hash_internal::Generator<T> gen; + hash_internal::UniqueGenerator<T> gen; TypeParam m({gen(), gen(), gen()}, 123, hasher, equal, alloc); TypeParam n; n = m; @@ -411,7 +416,7 @@ TYPED_TEST_P(ConstructorTest, MoveAssignment) { H hasher; E equal; A alloc(0); - hash_internal::Generator<T> gen; + hash_internal::UniqueGenerator<T> gen; TypeParam m({gen(), gen(), gen()}, 123, hasher, equal, alloc); TypeParam t(m); TypeParam n; @@ -423,7 +428,7 @@ TYPED_TEST_P(ConstructorTest, MoveAssignment) { TYPED_TEST_P(ConstructorTest, AssignmentFromInitializerList) { using T = hash_internal::GeneratedType<TypeParam>; - hash_internal::Generator<T> gen; + hash_internal::UniqueGenerator<T> gen; std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()}; TypeParam m; m = values; @@ -432,7 +437,7 @@ TYPED_TEST_P(ConstructorTest, AssignmentFromInitializerList) { TYPED_TEST_P(ConstructorTest, AssignmentOverwritesExisting) { using T = hash_internal::GeneratedType<TypeParam>; - hash_internal::Generator<T> gen; + hash_internal::UniqueGenerator<T> gen; TypeParam m({gen(), gen(), gen()}); TypeParam n({gen()}); n = m; @@ -441,7 +446,7 @@ TYPED_TEST_P(ConstructorTest, AssignmentOverwritesExisting) { TYPED_TEST_P(ConstructorTest, MoveAssignmentOverwritesExisting) { using T = hash_internal::GeneratedType<TypeParam>; - hash_internal::Generator<T> gen; + hash_internal::UniqueGenerator<T> gen; TypeParam m({gen(), gen(), gen()}); TypeParam t(m); TypeParam n({gen()}); @@ -451,7 +456,7 @@ TYPED_TEST_P(ConstructorTest, MoveAssignmentOverwritesExisting) { TYPED_TEST_P(ConstructorTest, AssignmentFromInitializerListOverwritesExisting) { using T = hash_internal::GeneratedType<TypeParam>; - hash_internal::Generator<T> gen; + hash_internal::UniqueGenerator<T> gen; std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()}; TypeParam m; m = values; @@ -460,7 +465,7 @@ TYPED_TEST_P(ConstructorTest, AssignmentFromInitializerListOverwritesExisting) { TYPED_TEST_P(ConstructorTest, AssignmentOnSelf) { using T = hash_internal::GeneratedType<TypeParam>; - hash_internal::Generator<T> gen; + hash_internal::UniqueGenerator<T> gen; std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()}; TypeParam m(values); m = *&m; // Avoid -Wself-assign diff --git a/third_party/abseil-cpp/absl/container/internal/unordered_map_modifiers_test.h b/third_party/abseil-cpp/absl/container/internal/unordered_map_modifiers_test.h index b8c513f157..d3543936f7 100644 --- a/third_party/abseil-cpp/absl/container/internal/unordered_map_modifiers_test.h +++ b/third_party/abseil-cpp/absl/container/internal/unordered_map_modifiers_test.h @@ -81,6 +81,38 @@ TYPED_TEST_P(ModifiersTest, InsertRange) { ASSERT_THAT(items(m), ::testing::UnorderedElementsAreArray(values)); } +TYPED_TEST_P(ModifiersTest, InsertWithinCapacity) { + using T = hash_internal::GeneratedType<TypeParam>; + using V = typename TypeParam::mapped_type; + T val = hash_internal::Generator<T>()(); + TypeParam m; + m.reserve(10); + const size_t original_capacity = m.bucket_count(); + m.insert(val); + EXPECT_EQ(m.bucket_count(), original_capacity); + T val2 = {val.first, hash_internal::Generator<V>()()}; + m.insert(val2); + EXPECT_EQ(m.bucket_count(), original_capacity); +} + +TYPED_TEST_P(ModifiersTest, InsertRangeWithinCapacity) { +#if !defined(__GLIBCXX__) + using T = hash_internal::GeneratedType<TypeParam>; + std::vector<T> base_values; + std::generate_n(std::back_inserter(base_values), 10, + hash_internal::Generator<T>()); + std::vector<T> values; + while (values.size() != 100) { + std::copy_n(base_values.begin(), 10, std::back_inserter(values)); + } + TypeParam m; + m.reserve(10); + const size_t original_capacity = m.bucket_count(); + m.insert(values.begin(), values.end()); + EXPECT_EQ(m.bucket_count(), original_capacity); +#endif +} + TYPED_TEST_P(ModifiersTest, InsertOrAssign) { #ifdef UNORDERED_MAP_CXX17 using std::get; @@ -266,9 +298,10 @@ TYPED_TEST_P(ModifiersTest, Swap) { // TODO(alkis): Write tests for merge. REGISTER_TYPED_TEST_CASE_P(ModifiersTest, Clear, Insert, InsertHint, - InsertRange, InsertOrAssign, InsertOrAssignHint, - Emplace, EmplaceHint, TryEmplace, TryEmplaceHint, - Erase, EraseRange, EraseKey, Swap); + InsertRange, InsertWithinCapacity, + InsertRangeWithinCapacity, InsertOrAssign, + InsertOrAssignHint, Emplace, EmplaceHint, TryEmplace, + TryEmplaceHint, Erase, EraseRange, EraseKey, Swap); template <typename Type> struct is_unique_ptr : std::false_type {}; @@ -286,6 +319,8 @@ class UniquePtrModifiersTest : public ::testing::Test { } }; +GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(UniquePtrModifiersTest); + TYPED_TEST_SUITE_P(UniquePtrModifiersTest); // Test that we do not move from rvalue arguments if an insertion does not diff --git a/third_party/abseil-cpp/absl/container/internal/unordered_set_modifiers_test.h b/third_party/abseil-cpp/absl/container/internal/unordered_set_modifiers_test.h index 26be58d99f..6e473e45da 100644 --- a/third_party/abseil-cpp/absl/container/internal/unordered_set_modifiers_test.h +++ b/third_party/abseil-cpp/absl/container/internal/unordered_set_modifiers_test.h @@ -74,6 +74,36 @@ TYPED_TEST_P(ModifiersTest, InsertRange) { ASSERT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values)); } +TYPED_TEST_P(ModifiersTest, InsertWithinCapacity) { + using T = hash_internal::GeneratedType<TypeParam>; + T val = hash_internal::Generator<T>()(); + TypeParam m; + m.reserve(10); + const size_t original_capacity = m.bucket_count(); + m.insert(val); + EXPECT_EQ(m.bucket_count(), original_capacity); + m.insert(val); + EXPECT_EQ(m.bucket_count(), original_capacity); +} + +TYPED_TEST_P(ModifiersTest, InsertRangeWithinCapacity) { +#if !defined(__GLIBCXX__) + using T = hash_internal::GeneratedType<TypeParam>; + std::vector<T> base_values; + std::generate_n(std::back_inserter(base_values), 10, + hash_internal::Generator<T>()); + std::vector<T> values; + while (values.size() != 100) { + values.insert(values.end(), base_values.begin(), base_values.end()); + } + TypeParam m; + m.reserve(10); + const size_t original_capacity = m.bucket_count(); + m.insert(values.begin(), values.end()); + EXPECT_EQ(m.bucket_count(), original_capacity); +#endif +} + TYPED_TEST_P(ModifiersTest, Emplace) { using T = hash_internal::GeneratedType<TypeParam>; T val = hash_internal::Generator<T>()(); @@ -180,8 +210,9 @@ TYPED_TEST_P(ModifiersTest, Swap) { // TODO(alkis): Write tests for merge. REGISTER_TYPED_TEST_CASE_P(ModifiersTest, Clear, Insert, InsertHint, - InsertRange, Emplace, EmplaceHint, Erase, EraseRange, - EraseKey, Swap); + InsertRange, InsertWithinCapacity, + InsertRangeWithinCapacity, Emplace, EmplaceHint, + Erase, EraseRange, EraseKey, Swap); } // namespace container_internal ABSL_NAMESPACE_END diff --git a/third_party/abseil-cpp/absl/container/node_hash_map.h b/third_party/abseil-cpp/absl/container/node_hash_map.h index fccea1841c..7a39f6284c 100644 --- a/third_party/abseil-cpp/absl/container/node_hash_map.h +++ b/third_party/abseil-cpp/absl/container/node_hash_map.h @@ -225,7 +225,8 @@ class node_hash_map // // size_type erase(const key_type& key): // - // Erases the element with the matching key, if it exists. + // Erases the element with the matching key, if it exists, returning the + // number of elements erased (0 or 1). using Base::erase; // node_hash_map::insert() @@ -374,6 +375,11 @@ class node_hash_map // key value and returns a node handle owning that extracted data. If the // `node_hash_map` does not contain an element with a matching key, this // function returns an empty node handle. + // + // NOTE: when compiled in an earlier version of C++ than C++17, + // `node_type::key()` returns a const reference to the key instead of a + // mutable reference. We cannot safely return a mutable reference without + // std::launder (which is not available before C++17). using Base::extract; // node_hash_map::merge() @@ -514,12 +520,6 @@ class node_hash_map // // Returns the function used for comparing keys equality. using Base::key_eq; - - ABSL_DEPRECATED("Call `hash_function()` instead.") - typename Base::hasher hash_funct() { return this->hash_function(); } - - ABSL_DEPRECATED("Call `rehash()` instead.") - void resize(typename Base::size_type hint) { this->rehash(hint); } }; // erase_if(node_hash_map<>, Pred) diff --git a/third_party/abseil-cpp/absl/container/node_hash_map_test.cc b/third_party/abseil-cpp/absl/container/node_hash_map_test.cc index 5d74b814b5..8f59a1e4a2 100644 --- a/third_party/abseil-cpp/absl/container/node_hash_map_test.cc +++ b/third_party/abseil-cpp/absl/container/node_hash_map_test.cc @@ -254,6 +254,21 @@ TEST(NodeHashMap, EraseIf) { } } +// This test requires std::launder for mutable key access in node handles. +#if defined(__cpp_lib_launder) && __cpp_lib_launder >= 201606 +TEST(NodeHashMap, NodeHandleMutableKeyAccess) { + node_hash_map<std::string, std::string> map; + + map["key1"] = "mapped"; + + auto nh = map.extract(map.begin()); + nh.key().resize(3); + map.insert(std::move(nh)); + + EXPECT_THAT(map, testing::ElementsAre(Pair("key", "mapped"))); +} +#endif + } // namespace } // namespace container_internal ABSL_NAMESPACE_END diff --git a/third_party/abseil-cpp/absl/container/node_hash_set.h b/third_party/abseil-cpp/absl/container/node_hash_set.h index ad54b6dccb..93b15f4681 100644 --- a/third_party/abseil-cpp/absl/container/node_hash_set.h +++ b/third_party/abseil-cpp/absl/container/node_hash_set.h @@ -18,7 +18,7 @@ // // An `absl::node_hash_set<T>` is an unordered associative container designed to // be a more efficient replacement for `std::unordered_set`. Like -// `unordered_set`, search, insertion, and deletion of map elements can be done +// `unordered_set`, search, insertion, and deletion of set elements can be done // as an `O(1)` operation. However, `node_hash_set` (and other unordered // associative containers known as the collection of Abseil "Swiss tables") // contain other optimizations that result in both memory and computation @@ -60,7 +60,7 @@ struct NodeHashSetPolicy; // following notable differences: // // * Supports heterogeneous lookup, through `find()`, `operator[]()` and -// `insert()`, provided that the map is provided a compatible heterogeneous +// `insert()`, provided that the set is provided a compatible heterogeneous // hashing function and equality operator. // * Contains a `capacity()` member function indicating the number of element // slots (open, deleted, and empty) within the hash set. @@ -76,13 +76,13 @@ struct NodeHashSetPolicy; // Example: // // // Create a node hash set of three strings -// absl::node_hash_map<std::string, std::string> ducks = +// absl::node_hash_set<std::string> ducks = // {"huey", "dewey", "louie"}; // -// // Insert a new element into the node hash map -// ducks.insert("donald"}; +// // Insert a new element into the node hash set +// ducks.insert("donald"); // -// // Force a rehash of the node hash map +// // Force a rehash of the node hash set // ducks.rehash(0); // // // See if "dewey" is present @@ -100,7 +100,7 @@ class node_hash_set public: // Constructors and Assignment Operators // - // A node_hash_set supports the same overload set as `std::unordered_map` + // A node_hash_set supports the same overload set as `std::unordered_set` // for construction and assignment: // // * Default constructor @@ -167,7 +167,7 @@ class node_hash_set // available within the `node_hash_set`. // // NOTE: this member function is particular to `absl::node_hash_set` and is - // not provided in the `std::unordered_map` API. + // not provided in the `std::unordered_set` API. using Base::capacity; // node_hash_set::empty() @@ -208,7 +208,7 @@ class node_hash_set // `void`. // // NOTE: this return behavior is different than that of STL containers in - // general and `std::unordered_map` in particular. + // general and `std::unordered_set` in particular. // // iterator erase(const_iterator first, const_iterator last): // @@ -217,7 +217,8 @@ class node_hash_set // // size_type erase(const key_type& key): // - // Erases the element with the matching key, if it exists. + // Erases the element with the matching key, if it exists, returning the + // number of elements erased (0 or 1). using Base::erase; // node_hash_set::insert() @@ -313,7 +314,7 @@ class node_hash_set // node_hash_set::merge() // - // Extracts elements from a given `source` flat hash map into this + // Extracts elements from a given `source` node hash set into this // `node_hash_set`. If the destination `node_hash_set` already contains an // element with an equivalent key, that element is not extracted. using Base::merge; @@ -321,15 +322,15 @@ class node_hash_set // node_hash_set::swap(node_hash_set& other) // // Exchanges the contents of this `node_hash_set` with those of the `other` - // flat hash map, avoiding invocation of any move, copy, or swap operations on + // node hash set, avoiding invocation of any move, copy, or swap operations on // individual elements. // // All iterators and references on the `node_hash_set` remain valid, excepting // for the past-the-end iterator, which is invalidated. // - // `swap()` requires that the flat hash set's hashing and key equivalence + // `swap()` requires that the node hash set's hashing and key equivalence // functions be Swappable, and are exchaged using unqualified calls to - // non-member `swap()`. If the map's allocator has + // non-member `swap()`. If the set's allocator has // `std::allocator_traits<allocator_type>::propagate_on_container_swap::value` // set to `true`, the allocators are also exchanged using an unqualified call // to non-member `swap()`; otherwise, the allocators are not swapped. @@ -384,14 +385,14 @@ class node_hash_set // node_hash_set::bucket_count() // // Returns the number of "buckets" within the `node_hash_set`. Note that - // because a flat hash map contains all elements within its internal storage, + // because a node hash set contains all elements within its internal storage, // this value simply equals the current capacity of the `node_hash_set`. using Base::bucket_count; // node_hash_set::load_factor() // // Returns the current load factor of the `node_hash_set` (the average number - // of slots occupied with a value within the hash map). + // of slots occupied with a value within the hash set). using Base::load_factor; // node_hash_set::max_load_factor() @@ -427,12 +428,6 @@ class node_hash_set // // Returns the function used for comparing keys equality. using Base::key_eq; - - ABSL_DEPRECATED("Call `hash_function()` instead.") - typename Base::hasher hash_funct() { return this->hash_function(); } - - ABSL_DEPRECATED("Call `rehash()` instead.") - void resize(typename Base::size_type hint) { this->rehash(hint); } }; // erase_if(node_hash_set<>, Pred) diff --git a/third_party/abseil-cpp/absl/container/sample_element_size_test.cc b/third_party/abseil-cpp/absl/container/sample_element_size_test.cc new file mode 100644 index 0000000000..b23626b409 --- /dev/null +++ b/third_party/abseil-cpp/absl/container/sample_element_size_test.cc @@ -0,0 +1,114 @@ +// 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 +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +#include "gmock/gmock.h" +#include "gtest/gtest.h" +#include "absl/container/flat_hash_map.h" +#include "absl/container/flat_hash_set.h" +#include "absl/container/node_hash_map.h" +#include "absl/container/node_hash_set.h" + +namespace absl { +ABSL_NAMESPACE_BEGIN +namespace container_internal { +namespace { + +#if defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE) +// Create some tables of type `Table`, then look at all the new +// `HashtablezInfo`s to make sure that the `inline_element_size == +// expected_element_size`. The `inline_element_size` is the amount of memory +// allocated for each slot of a hash table, that is `sizeof(slot_type)`. Add +// the new `HashtablezInfo`s to `preexisting_info`. Store all the new tables +// into `tables`. +template <class Table> +void TestInlineElementSize( + HashtablezSampler& sampler, + // clang-tidy gives a false positive on this declaration. This unordered + // set cannot be flat_hash_set, however, since that would introduce a mutex + // deadlock. + std::unordered_set<const HashtablezInfo*>& preexisting_info, // NOLINT + std::vector<Table>& tables, const typename Table::value_type& elt, + size_t expected_element_size) { + for (int i = 0; i < 10; ++i) { + // We create a new table and must store it somewhere so that when we store + // a pointer to the resulting `HashtablezInfo` into `preexisting_info` + // that we aren't storing a dangling pointer. + tables.emplace_back(); + // We must insert an element to get a hashtablez to instantiate. + tables.back().insert(elt); + } + size_t new_count = 0; + sampler.Iterate([&](const HashtablezInfo& info) { + if (preexisting_info.insert(&info).second) { + EXPECT_EQ(info.inline_element_size, expected_element_size); + ++new_count; + } + }); + // Make sure we actually did get a new hashtablez. + EXPECT_GT(new_count, 0); +} + +struct bigstruct { + char a[1000]; + friend bool operator==(const bigstruct& x, const bigstruct& y) { + return memcmp(x.a, y.a, sizeof(x.a)) == 0; + } + template <typename H> + friend H AbslHashValue(H h, const bigstruct& c) { + return H::combine_contiguous(std::move(h), c.a, sizeof(c.a)); + } +}; +#endif + +TEST(FlatHashMap, SampleElementSize) { +#if defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE) + // Enable sampling even if the prod default is off. + SetHashtablezEnabled(true); + SetHashtablezSampleParameter(1); + + auto& sampler = GlobalHashtablezSampler(); + std::vector<flat_hash_map<int, bigstruct>> flat_map_tables; + std::vector<flat_hash_set<bigstruct>> flat_set_tables; + std::vector<node_hash_map<int, bigstruct>> node_map_tables; + std::vector<node_hash_set<bigstruct>> node_set_tables; + + // It takes thousands of new tables after changing the sampling parameters + // before you actually get some instrumentation. And if you must actually + // put something into those tables. + for (int i = 0; i < 10000; ++i) { + flat_map_tables.emplace_back(); + flat_map_tables.back()[i] = bigstruct{}; + } + + // clang-tidy gives a false positive on this declaration. This unordered set + // cannot be a flat_hash_set, however, since that would introduce a mutex + // deadlock. + std::unordered_set<const HashtablezInfo*> preexisting_info; // NOLINT + sampler.Iterate( + [&](const HashtablezInfo& info) { preexisting_info.insert(&info); }); + TestInlineElementSize(sampler, preexisting_info, flat_map_tables, + {0, bigstruct{}}, sizeof(int) + sizeof(bigstruct)); + TestInlineElementSize(sampler, preexisting_info, node_map_tables, + {0, bigstruct{}}, sizeof(void*)); + TestInlineElementSize(sampler, preexisting_info, flat_set_tables, // + bigstruct{}, sizeof(bigstruct)); + TestInlineElementSize(sampler, preexisting_info, node_set_tables, // + bigstruct{}, sizeof(void*)); +#endif +} + +} // namespace +} // namespace container_internal +ABSL_NAMESPACE_END +} // namespace absl |