diff options
Diffstat (limited to 'third_party/abseil_cpp/absl/hash')
| -rw-r--r-- | third_party/abseil_cpp/absl/hash/BUILD.bazel | 122 | ||||
| -rw-r--r-- | third_party/abseil_cpp/absl/hash/CMakeLists.txt | 116 | ||||
| -rw-r--r-- | third_party/abseil_cpp/absl/hash/hash.h | 325 | ||||
| -rw-r--r-- | third_party/abseil_cpp/absl/hash/hash_test.cc | 976 | ||||
| -rw-r--r-- | third_party/abseil_cpp/absl/hash/hash_testing.h | 378 | ||||
| -rw-r--r-- | third_party/abseil_cpp/absl/hash/internal/city.cc | 349 | ||||
| -rw-r--r-- | third_party/abseil_cpp/absl/hash/internal/city.h | 78 | ||||
| -rw-r--r-- | third_party/abseil_cpp/absl/hash/internal/city_test.cc | 595 | ||||
| -rw-r--r-- | third_party/abseil_cpp/absl/hash/internal/hash.cc | 55 | ||||
| -rw-r--r-- | third_party/abseil_cpp/absl/hash/internal/hash.h | 1003 | ||||
| -rw-r--r-- | third_party/abseil_cpp/absl/hash/internal/print_hash_of.cc | 23 | ||||
| -rw-r--r-- | third_party/abseil_cpp/absl/hash/internal/spy_hash_state.h | 231 |
12 files changed, 0 insertions, 4251 deletions
diff --git a/third_party/abseil_cpp/absl/hash/BUILD.bazel b/third_party/abseil_cpp/absl/hash/BUILD.bazel deleted file mode 100644 index 5b1e2d01fd3c..000000000000 --- a/third_party/abseil_cpp/absl/hash/BUILD.bazel +++ /dev/null @@ -1,122 +0,0 @@ -# -# Copyright 2019 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. -# - -load("@rules_cc//cc:defs.bzl", "cc_library", "cc_test") -load( - "//absl:copts/configure_copts.bzl", - "ABSL_DEFAULT_COPTS", - "ABSL_DEFAULT_LINKOPTS", - "ABSL_TEST_COPTS", -) - -package(default_visibility = ["//visibility:public"]) - -licenses(["notice"]) - -cc_library( - name = "hash", - srcs = [ - "internal/hash.cc", - "internal/hash.h", - ], - hdrs = ["hash.h"], - copts = ABSL_DEFAULT_COPTS, - linkopts = ABSL_DEFAULT_LINKOPTS, - deps = [ - ":city", - "//absl/base:core_headers", - "//absl/base:endian", - "//absl/container:fixed_array", - "//absl/meta:type_traits", - "//absl/numeric:int128", - "//absl/strings", - "//absl/types:optional", - "//absl/types:variant", - "//absl/utility", - ], -) - -cc_library( - name = "hash_testing", - testonly = 1, - hdrs = ["hash_testing.h"], - linkopts = ABSL_DEFAULT_LINKOPTS, - deps = [ - ":spy_hash_state", - "//absl/meta:type_traits", - "//absl/strings", - "//absl/types:variant", - "@com_google_googletest//:gtest", - ], -) - -cc_test( - name = "hash_test", - srcs = ["hash_test.cc"], - copts = ABSL_TEST_COPTS, - linkopts = ABSL_DEFAULT_LINKOPTS, - deps = [ - ":hash", - ":hash_testing", - ":spy_hash_state", - "//absl/base:core_headers", - "//absl/container:flat_hash_set", - "//absl/meta:type_traits", - "//absl/numeric:int128", - "//absl/strings:cord_test_helpers", - "@com_google_googletest//:gtest_main", - ], -) - -cc_library( - name = "spy_hash_state", - testonly = 1, - hdrs = ["internal/spy_hash_state.h"], - copts = ABSL_DEFAULT_COPTS, - linkopts = ABSL_DEFAULT_LINKOPTS, - visibility = ["//visibility:private"], - deps = [ - ":hash", - "//absl/strings", - "//absl/strings:str_format", - ], -) - -cc_library( - name = "city", - srcs = ["internal/city.cc"], - hdrs = [ - "internal/city.h", - ], - copts = ABSL_DEFAULT_COPTS, - linkopts = ABSL_DEFAULT_LINKOPTS, - deps = [ - "//absl/base:config", - "//absl/base:core_headers", - "//absl/base:endian", - ], -) - -cc_test( - name = "city_test", - srcs = ["internal/city_test.cc"], - copts = ABSL_TEST_COPTS, - linkopts = ABSL_DEFAULT_LINKOPTS, - deps = [ - ":city", - "@com_google_googletest//:gtest_main", - ], -) diff --git a/third_party/abseil_cpp/absl/hash/CMakeLists.txt b/third_party/abseil_cpp/absl/hash/CMakeLists.txt deleted file mode 100644 index 61365e9bb5a1..000000000000 --- a/third_party/abseil_cpp/absl/hash/CMakeLists.txt +++ /dev/null @@ -1,116 +0,0 @@ -# -# 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. -# - -absl_cc_library( - NAME - hash - HDRS - "hash.h" - SRCS - "internal/hash.cc" - "internal/hash.h" - COPTS - ${ABSL_DEFAULT_COPTS} - DEPS - absl::core_headers - absl::endian - absl::fixed_array - absl::meta - absl::int128 - absl::strings - absl::optional - absl::variant - absl::utility - absl::city - PUBLIC -) - -absl_cc_library( - NAME - hash_testing - HDRS - "hash_testing.h" - COPTS - ${ABSL_TEST_COPTS} - DEPS - absl::spy_hash_state - absl::meta - absl::strings - absl::variant - gmock - TESTONLY -) - -absl_cc_test( - NAME - hash_test - SRCS - "hash_test.cc" - COPTS - ${ABSL_TEST_COPTS} - DEPS - absl::cord_test_helpers - absl::hash - absl::hash_testing - absl::core_headers - absl::flat_hash_set - absl::spy_hash_state - absl::meta - absl::int128 - gmock_main -) - -absl_cc_library( - NAME - spy_hash_state - HDRS - "internal/spy_hash_state.h" - COPTS - ${ABSL_DEFAULT_COPTS} - DEPS - absl::hash - absl::strings - absl::str_format - TESTONLY -) - -absl_cc_library( - NAME - city - HDRS - "internal/city.h" - SRCS - "internal/city.cc" - COPTS - ${ABSL_DEFAULT_COPTS} - DEPS - absl::config - absl::core_headers - absl::endian -) - -absl_cc_test( - NAME - city_test - SRCS - "internal/city_test.cc" - COPTS - ${ABSL_TEST_COPTS} - DEPS - absl::city - gmock_main -) - diff --git a/third_party/abseil_cpp/absl/hash/hash.h b/third_party/abseil_cpp/absl/hash/hash.h deleted file mode 100644 index 5de132cac8ac..000000000000 --- a/third_party/abseil_cpp/absl/hash/hash.h +++ /dev/null @@ -1,325 +0,0 @@ -// 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. -// -// ----------------------------------------------------------------------------- -// File: hash.h -// ----------------------------------------------------------------------------- -// -// This header file defines the Abseil `hash` library and the Abseil hashing -// framework. This framework consists of the following: -// -// * The `absl::Hash` functor, which is used to invoke the hasher within the -// Abseil hashing framework. `absl::Hash<T>` supports most basic types and -// a number of Abseil types out of the box. -// * `AbslHashValue`, an extension point that allows you to extend types to -// support Abseil hashing without requiring you to define a hashing -// algorithm. -// * `HashState`, a type-erased class which implements the manipulation of the -// hash state (H) itself, contains member functions `combine()` and -// `combine_contiguous()`, which you can use to contribute to an existing -// hash state when hashing your types. -// -// Unlike `std::hash` or other hashing frameworks, the Abseil hashing framework -// provides most of its utility by abstracting away the hash algorithm (and its -// implementation) entirely. Instead, a type invokes the Abseil hashing -// framework by simply combining its state with the state of known, hashable -// types. Hashing of that combined state is separately done by `absl::Hash`. -// -// One should assume that a hash algorithm is chosen randomly at the start of -// each process. E.g., `absl::Hash<int>{}(9)` in one process and -// `absl::Hash<int>{}(9)` in another process are likely to differ. -// -// `absl::Hash` is intended to strongly mix input bits with a target of passing -// an [Avalanche Test](https://en.wikipedia.org/wiki/Avalanche_effect). -// -// Example: -// -// // Suppose we have a class `Circle` for which we want to add hashing: -// class Circle { -// public: -// ... -// private: -// std::pair<int, int> center_; -// int radius_; -// }; -// -// // To add hashing support to `Circle`, we simply need to add a free -// // (non-member) function `AbslHashValue()`, and return the combined hash -// // state of the existing hash state and the class state. You can add such a -// // free function using a friend declaration within the body of the class: -// class Circle { -// public: -// ... -// template <typename H> -// friend H AbslHashValue(H h, const Circle& c) { -// return H::combine(std::move(h), c.center_, c.radius_); -// } -// ... -// }; -// -// For more information, see Adding Type Support to `absl::Hash` below. -// -#ifndef ABSL_HASH_HASH_H_ -#define ABSL_HASH_HASH_H_ - -#include "absl/hash/internal/hash.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN - -// ----------------------------------------------------------------------------- -// `absl::Hash` -// ----------------------------------------------------------------------------- -// -// `absl::Hash<T>` is a convenient general-purpose hash functor for any type `T` -// satisfying any of the following conditions (in order): -// -// * T is an arithmetic or pointer type -// * T defines an overload for `AbslHashValue(H, const T&)` for an arbitrary -// hash state `H`. -// - T defines a specialization of `std::hash<T>` -// -// `absl::Hash` intrinsically supports the following types: -// -// * All integral types (including bool) -// * All enum types -// * All floating-point types (although hashing them is discouraged) -// * All pointer types, including nullptr_t -// * std::pair<T1, T2>, if T1 and T2 are hashable -// * std::tuple<Ts...>, if all the Ts... are hashable -// * std::unique_ptr and std::shared_ptr -// * All string-like types including: -// * absl::Cord -// * std::string -// * std::string_view (as well as any instance of std::basic_string that -// uses char and std::char_traits) -// * All the standard sequence containers (provided the elements are hashable) -// * All the standard ordered associative containers (provided the elements are -// hashable) -// * absl types such as the following: -// * absl::string_view -// * absl::InlinedVector -// * absl::FixedArray -// * absl::uint128 -// * absl::Time, absl::Duration, and absl::TimeZone -// -// Note: the list above is not meant to be exhaustive. Additional type support -// may be added, in which case the above list will be updated. -// -// ----------------------------------------------------------------------------- -// absl::Hash Invocation Evaluation -// ----------------------------------------------------------------------------- -// -// When invoked, `absl::Hash<T>` searches for supplied hash functions in the -// following order: -// -// * Natively supported types out of the box (see above) -// * Types for which an `AbslHashValue()` overload is provided (such as -// user-defined types). See "Adding Type Support to `absl::Hash`" below. -// * Types which define a `std::hash<T>` specialization -// -// The fallback to legacy hash functions exists mainly for backwards -// compatibility. If you have a choice, prefer defining an `AbslHashValue` -// overload instead of specializing any legacy hash functors. -// -// ----------------------------------------------------------------------------- -// The Hash State Concept, and using `HashState` for Type Erasure -// ----------------------------------------------------------------------------- -// -// The `absl::Hash` framework relies on the Concept of a "hash state." Such a -// hash state is used in several places: -// -// * Within existing implementations of `absl::Hash<T>` to store the hashed -// state of an object. Note that it is up to the implementation how it stores -// such state. A hash table, for example, may mix the state to produce an -// integer value; a testing framework may simply hold a vector of that state. -// * Within implementations of `AbslHashValue()` used to extend user-defined -// types. (See "Adding Type Support to absl::Hash" below.) -// * Inside a `HashState`, providing type erasure for the concept of a hash -// state, which you can use to extend the `absl::Hash` framework for types -// that are otherwise difficult to extend using `AbslHashValue()`. (See the -// `HashState` class below.) -// -// The "hash state" concept contains two member functions for mixing hash state: -// -// * `H::combine(state, values...)` -// -// Combines an arbitrary number of values into a hash state, returning the -// updated state. Note that the existing hash state is move-only and must be -// passed by value. -// -// Each of the value types T must be hashable by H. -// -// NOTE: -// -// state = H::combine(std::move(state), value1, value2, value3); -// -// must be guaranteed to produce the same hash expansion as -// -// state = H::combine(std::move(state), value1); -// state = H::combine(std::move(state), value2); -// state = H::combine(std::move(state), value3); -// -// * `H::combine_contiguous(state, data, size)` -// -// Combines a contiguous array of `size` elements into a hash state, -// returning the updated state. Note that the existing hash state is -// move-only and must be passed by value. -// -// NOTE: -// -// state = H::combine_contiguous(std::move(state), data, size); -// -// need NOT be guaranteed to produce the same hash expansion as a loop -// (it may perform internal optimizations). If you need this guarantee, use a -// loop instead. -// -// ----------------------------------------------------------------------------- -// Adding Type Support to `absl::Hash` -// ----------------------------------------------------------------------------- -// -// To add support for your user-defined type, add a proper `AbslHashValue()` -// overload as a free (non-member) function. The overload will take an -// existing hash state and should combine that state with state from the type. -// -// Example: -// -// template <typename H> -// H AbslHashValue(H state, const MyType& v) { -// return H::combine(std::move(state), v.field1, ..., v.fieldN); -// } -// -// where `(field1, ..., fieldN)` are the members you would use on your -// `operator==` to define equality. -// -// Notice that `AbslHashValue` is not a class member, but an ordinary function. -// An `AbslHashValue` overload for a type should only be declared in the same -// file and namespace as said type. The proper `AbslHashValue` implementation -// for a given type will be discovered via ADL. -// -// Note: unlike `std::hash', `absl::Hash` should never be specialized. It must -// only be extended by adding `AbslHashValue()` overloads. -// -template <typename T> -using Hash = absl::hash_internal::Hash<T>; - -// HashState -// -// A type erased version of the hash state concept, for use in user-defined -// `AbslHashValue` implementations that can't use templates (such as PImpl -// classes, virtual functions, etc.). The type erasure adds overhead so it -// should be avoided unless necessary. -// -// Note: This wrapper will only erase calls to: -// combine_contiguous(H, const unsigned char*, size_t) -// -// All other calls will be handled internally and will not invoke overloads -// provided by the wrapped class. -// -// Users of this class should still define a template `AbslHashValue` function, -// but can use `absl::HashState::Create(&state)` to erase the type of the hash -// state and dispatch to their private hashing logic. -// -// This state can be used like any other hash state. In particular, you can call -// `HashState::combine()` and `HashState::combine_contiguous()` on it. -// -// Example: -// -// class Interface { -// public: -// template <typename H> -// friend H AbslHashValue(H state, const Interface& value) { -// state = H::combine(std::move(state), std::type_index(typeid(*this))); -// value.HashValue(absl::HashState::Create(&state)); -// return state; -// } -// private: -// virtual void HashValue(absl::HashState state) const = 0; -// }; -// -// class Impl : Interface { -// private: -// void HashValue(absl::HashState state) const override { -// absl::HashState::combine(std::move(state), v1_, v2_); -// } -// int v1_; -// std::string v2_; -// }; -class HashState : public hash_internal::HashStateBase<HashState> { - public: - // HashState::Create() - // - // Create a new `HashState` instance that wraps `state`. All calls to - // `combine()` and `combine_contiguous()` on the new instance will be - // redirected to the original `state` object. The `state` object must outlive - // the `HashState` instance. - template <typename T> - static HashState Create(T* state) { - HashState s; - s.Init(state); - return s; - } - - HashState(const HashState&) = delete; - HashState& operator=(const HashState&) = delete; - HashState(HashState&&) = default; - HashState& operator=(HashState&&) = default; - - // HashState::combine() - // - // Combines an arbitrary number of values into a hash state, returning the - // updated state. - using HashState::HashStateBase::combine; - - // HashState::combine_contiguous() - // - // Combines a contiguous array of `size` elements into a hash state, returning - // the updated state. - static HashState combine_contiguous(HashState hash_state, - const unsigned char* first, size_t size) { - hash_state.combine_contiguous_(hash_state.state_, first, size); - return hash_state; - } - using HashState::HashStateBase::combine_contiguous; - - private: - HashState() = default; - - template <typename T> - static void CombineContiguousImpl(void* p, const unsigned char* first, - size_t size) { - T& state = *static_cast<T*>(p); - state = T::combine_contiguous(std::move(state), first, size); - } - - template <typename T> - void Init(T* state) { - state_ = state; - combine_contiguous_ = &CombineContiguousImpl<T>; - } - - // Do not erase an already erased state. - void Init(HashState* state) { - state_ = state->state_; - combine_contiguous_ = state->combine_contiguous_; - } - - void* state_; - void (*combine_contiguous_)(void*, const unsigned char*, size_t); -}; - -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_HASH_HASH_H_ diff --git a/third_party/abseil_cpp/absl/hash/hash_test.cc b/third_party/abseil_cpp/absl/hash/hash_test.cc deleted file mode 100644 index 1d2e6cf0df44..000000000000 --- a/third_party/abseil_cpp/absl/hash/hash_test.cc +++ /dev/null @@ -1,976 +0,0 @@ -// 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/hash/hash.h" - -#include <array> -#include <bitset> -#include <cstring> -#include <deque> -#include <forward_list> -#include <functional> -#include <iterator> -#include <limits> -#include <list> -#include <map> -#include <memory> -#include <numeric> -#include <random> -#include <set> -#include <string> -#include <tuple> -#include <type_traits> -#include <unordered_map> -#include <utility> -#include <vector> - -#include "gmock/gmock.h" -#include "gtest/gtest.h" -#include "absl/container/flat_hash_set.h" -#include "absl/hash/hash_testing.h" -#include "absl/hash/internal/spy_hash_state.h" -#include "absl/meta/type_traits.h" -#include "absl/numeric/int128.h" -#include "absl/strings/cord_test_helpers.h" - -namespace { - -using absl::Hash; -using absl::hash_internal::SpyHashState; - -template <typename T> -class HashValueIntTest : public testing::Test { -}; -TYPED_TEST_SUITE_P(HashValueIntTest); - -template <typename T> -SpyHashState SpyHash(const T& value) { - return SpyHashState::combine(SpyHashState(), value); -} - -// Helper trait to verify if T is hashable. We use absl::Hash's poison status to -// detect it. -template <typename T> -using is_hashable = std::is_default_constructible<absl::Hash<T>>; - -TYPED_TEST_P(HashValueIntTest, BasicUsage) { - EXPECT_TRUE((is_hashable<TypeParam>::value)); - - TypeParam n = 42; - EXPECT_EQ(SpyHash(n), SpyHash(TypeParam{42})); - EXPECT_NE(SpyHash(n), SpyHash(TypeParam{0})); - EXPECT_NE(SpyHash(std::numeric_limits<TypeParam>::max()), - SpyHash(std::numeric_limits<TypeParam>::min())); -} - -TYPED_TEST_P(HashValueIntTest, FastPath) { - // Test the fast-path to make sure the values are the same. - TypeParam n = 42; - EXPECT_EQ(absl::Hash<TypeParam>{}(n), - absl::Hash<std::tuple<TypeParam>>{}(std::tuple<TypeParam>(n))); -} - -REGISTER_TYPED_TEST_CASE_P(HashValueIntTest, BasicUsage, FastPath); -using IntTypes = testing::Types<unsigned char, char, int, int32_t, int64_t, - uint32_t, uint64_t, size_t>; -INSTANTIATE_TYPED_TEST_CASE_P(My, HashValueIntTest, IntTypes); - -enum LegacyEnum { kValue1, kValue2, kValue3 }; - -enum class EnumClass { kValue4, kValue5, kValue6 }; - -TEST(HashValueTest, EnumAndBool) { - EXPECT_TRUE((is_hashable<LegacyEnum>::value)); - EXPECT_TRUE((is_hashable<EnumClass>::value)); - EXPECT_TRUE((is_hashable<bool>::value)); - - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple( - LegacyEnum::kValue1, LegacyEnum::kValue2, LegacyEnum::kValue3))); - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple( - EnumClass::kValue4, EnumClass::kValue5, EnumClass::kValue6))); - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly( - std::make_tuple(true, false))); -} - -TEST(HashValueTest, FloatingPoint) { - EXPECT_TRUE((is_hashable<float>::value)); - EXPECT_TRUE((is_hashable<double>::value)); - EXPECT_TRUE((is_hashable<long double>::value)); - - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly( - std::make_tuple(42.f, 0.f, -0.f, std::numeric_limits<float>::infinity(), - -std::numeric_limits<float>::infinity()))); - - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly( - std::make_tuple(42., 0., -0., std::numeric_limits<double>::infinity(), - -std::numeric_limits<double>::infinity()))); - - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple( - // Add some values with small exponent to test that NORMAL values also - // append their category. - .5L, 1.L, 2.L, 4.L, 42.L, 0.L, -0.L, - 17 * static_cast<long double>(std::numeric_limits<double>::max()), - std::numeric_limits<long double>::infinity(), - -std::numeric_limits<long double>::infinity()))); -} - -TEST(HashValueTest, Pointer) { - EXPECT_TRUE((is_hashable<int*>::value)); - - int i; - int* ptr = &i; - int* n = nullptr; - - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly( - std::make_tuple(&i, ptr, nullptr, ptr + 1, n))); -} - -TEST(HashValueTest, PointerAlignment) { - // We want to make sure that pointer alignment will not cause bits to be - // stuck. - - constexpr size_t kTotalSize = 1 << 20; - std::unique_ptr<char[]> data(new char[kTotalSize]); - constexpr size_t kLog2NumValues = 5; - constexpr size_t kNumValues = 1 << kLog2NumValues; - - for (size_t align = 1; align < kTotalSize / kNumValues; - align < 8 ? align += 1 : align < 1024 ? align += 8 : align += 32) { - SCOPED_TRACE(align); - ASSERT_LE(align * kNumValues, kTotalSize); - - size_t bits_or = 0; - size_t bits_and = ~size_t{}; - - for (size_t i = 0; i < kNumValues; ++i) { - size_t hash = absl::Hash<void*>()(data.get() + i * align); - bits_or |= hash; - bits_and &= hash; - } - - // Limit the scope to the bits we would be using for Swisstable. - constexpr size_t kMask = (1 << (kLog2NumValues + 7)) - 1; - size_t stuck_bits = (~bits_or | bits_and) & kMask; - EXPECT_EQ(stuck_bits, 0) << "0x" << std::hex << stuck_bits; - } -} - -TEST(HashValueTest, PairAndTuple) { - EXPECT_TRUE((is_hashable<std::pair<int, int>>::value)); - EXPECT_TRUE((is_hashable<std::pair<const int&, const int&>>::value)); - EXPECT_TRUE((is_hashable<std::tuple<int&, int&>>::value)); - EXPECT_TRUE((is_hashable<std::tuple<int&&, int&&>>::value)); - - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple( - std::make_pair(0, 42), std::make_pair(0, 42), std::make_pair(42, 0), - std::make_pair(0, 0), std::make_pair(42, 42), std::make_pair(1, 42)))); - - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly( - std::make_tuple(std::make_tuple(0, 0, 0), std::make_tuple(0, 0, 42), - std::make_tuple(0, 23, 0), std::make_tuple(17, 0, 0), - std::make_tuple(42, 0, 0), std::make_tuple(3, 9, 9), - std::make_tuple(0, 0, -42)))); - - // Test that tuples of lvalue references work (so we need a few lvalues): - int a = 0, b = 1, c = 17, d = 23; - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple( - std::tie(a, a), std::tie(a, b), std::tie(b, c), std::tie(c, d)))); - - // Test that tuples of rvalue references work: - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple( - std::forward_as_tuple(0, 0, 0), std::forward_as_tuple(0, 0, 42), - std::forward_as_tuple(0, 23, 0), std::forward_as_tuple(17, 0, 0), - std::forward_as_tuple(42, 0, 0), std::forward_as_tuple(3, 9, 9), - std::forward_as_tuple(0, 0, -42)))); -} - -TEST(HashValueTest, CombineContiguousWorks) { - std::vector<std::tuple<int>> v1 = {std::make_tuple(1), std::make_tuple(3)}; - std::vector<std::tuple<int>> v2 = {std::make_tuple(1), std::make_tuple(2)}; - - auto vh1 = SpyHash(v1); - auto vh2 = SpyHash(v2); - EXPECT_NE(vh1, vh2); -} - -struct DummyDeleter { - template <typename T> - void operator() (T* ptr) {} -}; - -struct SmartPointerEq { - template <typename T, typename U> - bool operator()(const T& t, const U& u) const { - return GetPtr(t) == GetPtr(u); - } - - template <typename T> - static auto GetPtr(const T& t) -> decltype(&*t) { - return t ? &*t : nullptr; - } - - static std::nullptr_t GetPtr(std::nullptr_t) { return nullptr; } -}; - -TEST(HashValueTest, SmartPointers) { - EXPECT_TRUE((is_hashable<std::unique_ptr<int>>::value)); - EXPECT_TRUE((is_hashable<std::unique_ptr<int, DummyDeleter>>::value)); - EXPECT_TRUE((is_hashable<std::shared_ptr<int>>::value)); - - int i, j; - std::unique_ptr<int, DummyDeleter> unique1(&i); - std::unique_ptr<int, DummyDeleter> unique2(&i); - std::unique_ptr<int, DummyDeleter> unique_other(&j); - std::unique_ptr<int, DummyDeleter> unique_null; - - std::shared_ptr<int> shared1(&i, DummyDeleter()); - std::shared_ptr<int> shared2(&i, DummyDeleter()); - std::shared_ptr<int> shared_other(&j, DummyDeleter()); - std::shared_ptr<int> shared_null; - - // Sanity check of the Eq function. - ASSERT_TRUE(SmartPointerEq{}(unique1, shared1)); - ASSERT_FALSE(SmartPointerEq{}(unique1, shared_other)); - ASSERT_TRUE(SmartPointerEq{}(unique_null, nullptr)); - ASSERT_FALSE(SmartPointerEq{}(shared2, nullptr)); - - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly( - std::forward_as_tuple(&i, nullptr, // - unique1, unique2, unique_null, // - absl::make_unique<int>(), // - shared1, shared2, shared_null, // - std::make_shared<int>()), - SmartPointerEq{})); -} - -TEST(HashValueTest, FunctionPointer) { - using Func = int (*)(); - EXPECT_TRUE(is_hashable<Func>::value); - - Func p1 = [] { return 2; }, p2 = [] { return 1; }; - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly( - std::make_tuple(p1, p2, nullptr))); -} - -struct WrapInTuple { - template <typename T> - std::tuple<int, T, size_t> operator()(const T& t) const { - return std::make_tuple(7, t, 0xdeadbeef); - } -}; - -absl::Cord FlatCord(absl::string_view sv) { - absl::Cord c(sv); - c.Flatten(); - return c; -} - -absl::Cord FragmentedCord(absl::string_view sv) { - if (sv.size() < 2) { - return absl::Cord(sv); - } - size_t halfway = sv.size() / 2; - std::vector<absl::string_view> parts = {sv.substr(0, halfway), - sv.substr(halfway)}; - return absl::MakeFragmentedCord(parts); -} - -TEST(HashValueTest, Strings) { - EXPECT_TRUE((is_hashable<std::string>::value)); - - const std::string small = "foo"; - const std::string dup = "foofoo"; - const std::string large = std::string(2048, 'x'); // multiple of chunk size - const std::string huge = std::string(5000, 'a'); // not a multiple - - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple( // - std::string(), absl::string_view(), absl::Cord(), // - std::string(""), absl::string_view(""), absl::Cord(""), // - std::string(small), absl::string_view(small), absl::Cord(small), // - std::string(dup), absl::string_view(dup), absl::Cord(dup), // - std::string(large), absl::string_view(large), absl::Cord(large), // - std::string(huge), absl::string_view(huge), FlatCord(huge), // - FragmentedCord(huge)))); - - // Also check that nested types maintain the same hash. - const WrapInTuple t{}; - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple( // - t(std::string()), t(absl::string_view()), t(absl::Cord()), // - t(std::string("")), t(absl::string_view("")), t(absl::Cord("")), // - t(std::string(small)), t(absl::string_view(small)), // - t(absl::Cord(small)), // - t(std::string(dup)), t(absl::string_view(dup)), t(absl::Cord(dup)), // - t(std::string(large)), t(absl::string_view(large)), // - t(absl::Cord(large)), // - t(std::string(huge)), t(absl::string_view(huge)), // - t(FlatCord(huge)), t(FragmentedCord(huge))))); - - // Make sure that hashing a `const char*` does not use its string-value. - EXPECT_NE(SpyHash(static_cast<const char*>("ABC")), - SpyHash(absl::string_view("ABC"))); -} - -TEST(HashValueTest, WString) { - EXPECT_TRUE((is_hashable<std::wstring>::value)); - - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple( - std::wstring(), std::wstring(L"ABC"), std::wstring(L"ABC"), - std::wstring(L"Some other different string"), - std::wstring(L"Iรฑtรซrnรขtiรดnร lizรฆtiรธn")))); -} - -TEST(HashValueTest, U16String) { - EXPECT_TRUE((is_hashable<std::u16string>::value)); - - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple( - std::u16string(), std::u16string(u"ABC"), std::u16string(u"ABC"), - std::u16string(u"Some other different string"), - std::u16string(u"Iรฑtรซrnรขtiรดnร lizรฆtiรธn")))); -} - -TEST(HashValueTest, U32String) { - EXPECT_TRUE((is_hashable<std::u32string>::value)); - - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple( - std::u32string(), std::u32string(U"ABC"), std::u32string(U"ABC"), - std::u32string(U"Some other different string"), - std::u32string(U"Iรฑtรซrnรขtiรดnร lizรฆtiรธn")))); -} - -TEST(HashValueTest, StdArray) { - EXPECT_TRUE((is_hashable<std::array<int, 3>>::value)); - - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly( - std::make_tuple(std::array<int, 3>{}, std::array<int, 3>{{0, 23, 42}}))); -} - -TEST(HashValueTest, StdBitset) { - EXPECT_TRUE((is_hashable<std::bitset<257>>::value)); - - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly( - {std::bitset<2>("00"), std::bitset<2>("01"), std::bitset<2>("10"), - std::bitset<2>("11")})); - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly( - {std::bitset<5>("10101"), std::bitset<5>("10001"), std::bitset<5>()})); - - constexpr int kNumBits = 256; - std::array<std::string, 6> bit_strings; - bit_strings.fill(std::string(kNumBits, '1')); - bit_strings[1][0] = '0'; - bit_strings[2][1] = '0'; - bit_strings[3][kNumBits / 3] = '0'; - bit_strings[4][kNumBits - 2] = '0'; - bit_strings[5][kNumBits - 1] = '0'; - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly( - {std::bitset<kNumBits>(bit_strings[0].c_str()), - std::bitset<kNumBits>(bit_strings[1].c_str()), - std::bitset<kNumBits>(bit_strings[2].c_str()), - std::bitset<kNumBits>(bit_strings[3].c_str()), - std::bitset<kNumBits>(bit_strings[4].c_str()), - std::bitset<kNumBits>(bit_strings[5].c_str())})); -} // namespace - -template <typename T> -class HashValueSequenceTest : public testing::Test { -}; -TYPED_TEST_SUITE_P(HashValueSequenceTest); - -TYPED_TEST_P(HashValueSequenceTest, BasicUsage) { - EXPECT_TRUE((is_hashable<TypeParam>::value)); - - using ValueType = typename TypeParam::value_type; - auto a = static_cast<ValueType>(0); - auto b = static_cast<ValueType>(23); - auto c = static_cast<ValueType>(42); - - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly( - std::make_tuple(TypeParam(), TypeParam{}, TypeParam{a, b, c}, - TypeParam{a, b}, TypeParam{b, c}))); -} - -REGISTER_TYPED_TEST_CASE_P(HashValueSequenceTest, BasicUsage); -using IntSequenceTypes = - testing::Types<std::deque<int>, std::forward_list<int>, std::list<int>, - std::vector<int>, std::vector<bool>, std::set<int>, - std::multiset<int>>; -INSTANTIATE_TYPED_TEST_CASE_P(My, HashValueSequenceTest, IntSequenceTypes); - -// Private type that only supports AbslHashValue to make sure our chosen hash -// implementation is recursive within absl::Hash. -// It uses std::abs() on the value to provide different bitwise representations -// of the same logical value. -struct Private { - int i; - template <typename H> - friend H AbslHashValue(H h, Private p) { - return H::combine(std::move(h), std::abs(p.i)); - } - - friend bool operator==(Private a, Private b) { - return std::abs(a.i) == std::abs(b.i); - } - - friend std::ostream& operator<<(std::ostream& o, Private p) { - return o << p.i; - } -}; - -// Test helper for combine_piecewise_buffer. It holds a string_view to the -// buffer-to-be-hashed. Its AbslHashValue specialization will split up its -// contents at the character offsets requested. -class PiecewiseHashTester { - public: - // Create a hash view of a buffer to be hashed contiguously. - explicit PiecewiseHashTester(absl::string_view buf) - : buf_(buf), piecewise_(false), split_locations_() {} - - // Create a hash view of a buffer to be hashed piecewise, with breaks at the - // given locations. - PiecewiseHashTester(absl::string_view buf, std::set<size_t> split_locations) - : buf_(buf), - piecewise_(true), - split_locations_(std::move(split_locations)) {} - - template <typename H> - friend H AbslHashValue(H h, const PiecewiseHashTester& p) { - if (!p.piecewise_) { - return H::combine_contiguous(std::move(h), p.buf_.data(), p.buf_.size()); - } - absl::hash_internal::PiecewiseCombiner combiner; - if (p.split_locations_.empty()) { - h = combiner.add_buffer(std::move(h), p.buf_.data(), p.buf_.size()); - return combiner.finalize(std::move(h)); - } - size_t begin = 0; - for (size_t next : p.split_locations_) { - absl::string_view chunk = p.buf_.substr(begin, next - begin); - h = combiner.add_buffer(std::move(h), chunk.data(), chunk.size()); - begin = next; - } - absl::string_view last_chunk = p.buf_.substr(begin); - if (!last_chunk.empty()) { - h = combiner.add_buffer(std::move(h), last_chunk.data(), - last_chunk.size()); - } - return combiner.finalize(std::move(h)); - } - - private: - absl::string_view buf_; - bool piecewise_; - std::set<size_t> split_locations_; -}; - -// Dummy object that hashes as two distinct contiguous buffers, "foo" followed -// by "bar" -struct DummyFooBar { - template <typename H> - friend H AbslHashValue(H h, const DummyFooBar&) { - const char* foo = "foo"; - const char* bar = "bar"; - h = H::combine_contiguous(std::move(h), foo, 3); - h = H::combine_contiguous(std::move(h), bar, 3); - return h; - } -}; - -TEST(HashValueTest, CombinePiecewiseBuffer) { - absl::Hash<PiecewiseHashTester> hash; - - // Check that hashing an empty buffer through the piecewise API works. - EXPECT_EQ(hash(PiecewiseHashTester("")), hash(PiecewiseHashTester("", {}))); - - // Similarly, small buffers should give consistent results - EXPECT_EQ(hash(PiecewiseHashTester("foobar")), - hash(PiecewiseHashTester("foobar", {}))); - EXPECT_EQ(hash(PiecewiseHashTester("foobar")), - hash(PiecewiseHashTester("foobar", {3}))); - - // But hashing "foobar" in pieces gives a different answer than hashing "foo" - // contiguously, then "bar" contiguously. - EXPECT_NE(hash(PiecewiseHashTester("foobar", {3})), - absl::Hash<DummyFooBar>()(DummyFooBar{})); - - // Test hashing a large buffer incrementally, broken up in several different - // ways. Arrange for breaks on and near the stride boundaries to look for - // off-by-one errors in the implementation. - // - // This test is run on a buffer that is a multiple of the stride size, and one - // that isn't. - for (size_t big_buffer_size : {1024 * 2 + 512, 1024 * 3}) { - SCOPED_TRACE(big_buffer_size); - std::string big_buffer; - for (int i = 0; i < big_buffer_size; ++i) { - // Arbitrary string - big_buffer.push_back(32 + (i * (i / 3)) % 64); - } - auto big_buffer_hash = hash(PiecewiseHashTester(big_buffer)); - - const int possible_breaks = 9; - size_t breaks[possible_breaks] = {1, 512, 1023, 1024, 1025, - 1536, 2047, 2048, 2049}; - for (unsigned test_mask = 0; test_mask < (1u << possible_breaks); - ++test_mask) { - SCOPED_TRACE(test_mask); - std::set<size_t> break_locations; - for (int j = 0; j < possible_breaks; ++j) { - if (test_mask & (1u << j)) { - break_locations.insert(breaks[j]); - } - } - EXPECT_EQ( - hash(PiecewiseHashTester(big_buffer, std::move(break_locations))), - big_buffer_hash); - } - } -} - -TEST(HashValueTest, PrivateSanity) { - // Sanity check that Private is working as the tests below expect it to work. - EXPECT_TRUE(is_hashable<Private>::value); - EXPECT_NE(SpyHash(Private{0}), SpyHash(Private{1})); - EXPECT_EQ(SpyHash(Private{1}), SpyHash(Private{1})); -} - -TEST(HashValueTest, Optional) { - EXPECT_TRUE(is_hashable<absl::optional<Private>>::value); - - using O = absl::optional<Private>; - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly( - std::make_tuple(O{}, O{{1}}, O{{-1}}, O{{10}}))); -} - -TEST(HashValueTest, Variant) { - using V = absl::variant<Private, std::string>; - EXPECT_TRUE(is_hashable<V>::value); - - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple( - V(Private{1}), V(Private{-1}), V(Private{2}), V("ABC"), V("BCD")))); - -#if ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_ - struct S {}; - EXPECT_FALSE(is_hashable<absl::variant<S>>::value); -#endif -} - -TEST(HashValueTest, Maps) { - EXPECT_TRUE((is_hashable<std::map<int, std::string>>::value)); - - using M = std::map<int, std::string>; - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple( - M{}, M{{0, "foo"}}, M{{1, "foo"}}, M{{0, "bar"}}, M{{1, "bar"}}, - M{{0, "foo"}, {42, "bar"}}, M{{1, "foo"}, {42, "bar"}}, - M{{1, "foo"}, {43, "bar"}}, M{{1, "foo"}, {43, "baz"}}))); - - using MM = std::multimap<int, std::string>; - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple( - MM{}, MM{{0, "foo"}}, MM{{1, "foo"}}, MM{{0, "bar"}}, MM{{1, "bar"}}, - MM{{0, "foo"}, {0, "bar"}}, MM{{0, "bar"}, {0, "foo"}}, - MM{{0, "foo"}, {42, "bar"}}, MM{{1, "foo"}, {42, "bar"}}, - MM{{1, "foo"}, {1, "foo"}, {43, "bar"}}, MM{{1, "foo"}, {43, "baz"}}))); -} - -TEST(HashValueTest, ReferenceWrapper) { - EXPECT_TRUE(is_hashable<std::reference_wrapper<Private>>::value); - - Private p1{1}, p10{10}; - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple( - p1, p10, std::ref(p1), std::ref(p10), std::cref(p1), std::cref(p10)))); - - EXPECT_TRUE(is_hashable<std::reference_wrapper<int>>::value); - int one = 1, ten = 10; - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple( - one, ten, std::ref(one), std::ref(ten), std::cref(one), std::cref(ten)))); - - EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly( - std::make_tuple(std::tuple<std::reference_wrapper<int>>(std::ref(one)), - std::tuple<std::reference_wrapper<int>>(std::ref(ten)), - std::tuple<int>(one), std::tuple<int>(ten)))); -} - -template <typename T, typename = void> -struct IsHashCallable : std::false_type {}; - -template <typename T> -struct IsHashCallable<T, absl::void_t<decltype(std::declval<absl::Hash<T>>()( - std::declval<const T&>()))>> : std::true_type {}; - -template <typename T, typename = void> -struct IsAggregateInitializable : std::false_type {}; - -template <typename T> -struct IsAggregateInitializable<T, absl::void_t<decltype(T{})>> - : std::true_type {}; - -TEST(IsHashableTest, ValidHash) { - EXPECT_TRUE((is_hashable<int>::value)); - EXPECT_TRUE(std::is_default_constructible<absl::Hash<int>>::value); - EXPECT_TRUE(std::is_copy_constructible<absl::Hash<int>>::value); - EXPECT_TRUE(std::is_move_constructible<absl::Hash<int>>::value); - EXPECT_TRUE(absl::is_copy_assignable<absl::Hash<int>>::value); - EXPECT_TRUE(absl::is_move_assignable<absl::Hash<int>>::value); - EXPECT_TRUE(IsHashCallable<int>::value); - EXPECT_TRUE(IsAggregateInitializable<absl::Hash<int>>::value); -} - -#if ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_ -TEST(IsHashableTest, PoisonHash) { - struct X {}; - EXPECT_FALSE((is_hashable<X>::value)); - EXPECT_FALSE(std::is_default_constructible<absl::Hash<X>>::value); - EXPECT_FALSE(std::is_copy_constructible<absl::Hash<X>>::value); - EXPECT_FALSE(std::is_move_constructible<absl::Hash<X>>::value); - EXPECT_FALSE(absl::is_copy_assignable<absl::Hash<X>>::value); - EXPECT_FALSE(absl::is_move_assignable<absl::Hash<X>>::value); - EXPECT_FALSE(IsHashCallable<X>::value); -#if !defined(__GNUC__) || __GNUC__ < 9 - // This doesn't compile on GCC 9. - EXPECT_FALSE(IsAggregateInitializable<absl::Hash<X>>::value); -#endif -} -#endif // ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_ - -// Hashable types -// -// These types exist simply to exercise various AbslHashValue behaviors, so -// they are named by what their AbslHashValue overload does. -struct NoOp { - template <typename HashCode> - friend HashCode AbslHashValue(HashCode h, NoOp n) { - return h; - } -}; - -struct EmptyCombine { - template <typename HashCode> - friend HashCode AbslHashValue(HashCode h, EmptyCombine e) { - return HashCode::combine(std::move(h)); - } -}; - -template <typename Int> -struct CombineIterative { - template <typename HashCode> - friend HashCode AbslHashValue(HashCode h, CombineIterative c) { - for (int i = 0; i < 5; ++i) { - h = HashCode::combine(std::move(h), Int(i)); - } - return h; - } -}; - -template <typename Int> -struct CombineVariadic { - template <typename HashCode> - friend HashCode AbslHashValue(HashCode h, CombineVariadic c) { - return HashCode::combine(std::move(h), Int(0), Int(1), Int(2), Int(3), - Int(4)); - } -}; -enum class InvokeTag { - kUniquelyRepresented, - kHashValue, -#if ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_ - kLegacyHash, -#endif // ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_ - kStdHash, - kNone -}; - -template <InvokeTag T> -using InvokeTagConstant = std::integral_constant<InvokeTag, T>; - -template <InvokeTag... Tags> -struct MinTag; - -template <InvokeTag a, InvokeTag b, InvokeTag... Tags> -struct MinTag<a, b, Tags...> : MinTag<(a < b ? a : b), Tags...> {}; - -template <InvokeTag a> -struct MinTag<a> : InvokeTagConstant<a> {}; - -template <InvokeTag... Tags> -struct CustomHashType { - explicit CustomHashType(size_t val) : value(val) {} - size_t value; -}; - -template <InvokeTag allowed, InvokeTag... tags> -struct EnableIfContained - : std::enable_if<absl::disjunction< - std::integral_constant<bool, allowed == tags>...>::value> {}; - -template < - typename H, InvokeTag... Tags, - typename = typename EnableIfContained<InvokeTag::kHashValue, Tags...>::type> -H AbslHashValue(H state, CustomHashType<Tags...> t) { - static_assert(MinTag<Tags...>::value == InvokeTag::kHashValue, ""); - return H::combine(std::move(state), - t.value + static_cast<int>(InvokeTag::kHashValue)); -} - -} // namespace - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace hash_internal { -template <InvokeTag... Tags> -struct is_uniquely_represented< - CustomHashType<Tags...>, - typename EnableIfContained<InvokeTag::kUniquelyRepresented, Tags...>::type> - : std::true_type {}; -} // namespace hash_internal -ABSL_NAMESPACE_END -} // namespace absl - -#if ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_ -namespace ABSL_INTERNAL_LEGACY_HASH_NAMESPACE { -template <InvokeTag... Tags> -struct hash<CustomHashType<Tags...>> { - template <InvokeTag... TagsIn, typename = typename EnableIfContained< - InvokeTag::kLegacyHash, TagsIn...>::type> - size_t operator()(CustomHashType<TagsIn...> t) const { - static_assert(MinTag<Tags...>::value == InvokeTag::kLegacyHash, ""); - return t.value + static_cast<int>(InvokeTag::kLegacyHash); - } -}; -} // namespace ABSL_INTERNAL_LEGACY_HASH_NAMESPACE -#endif // ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_ - -namespace std { -template <InvokeTag... Tags> // NOLINT -struct hash<CustomHashType<Tags...>> { - template <InvokeTag... TagsIn, typename = typename EnableIfContained< - InvokeTag::kStdHash, TagsIn...>::type> - size_t operator()(CustomHashType<TagsIn...> t) const { - static_assert(MinTag<Tags...>::value == InvokeTag::kStdHash, ""); - return t.value + static_cast<int>(InvokeTag::kStdHash); - } -}; -} // namespace std - -namespace { - -template <typename... T> -void TestCustomHashType(InvokeTagConstant<InvokeTag::kNone>, T...) { - using type = CustomHashType<T::value...>; - SCOPED_TRACE(testing::PrintToString(std::vector<InvokeTag>{T::value...})); - EXPECT_TRUE(is_hashable<type>()); - EXPECT_TRUE(is_hashable<const type>()); - EXPECT_TRUE(is_hashable<const type&>()); - - const size_t offset = static_cast<int>(std::min({T::value...})); - EXPECT_EQ(SpyHash(type(7)), SpyHash(size_t{7 + offset})); -} - -void TestCustomHashType(InvokeTagConstant<InvokeTag::kNone>) { -#if ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_ - // is_hashable is false if we don't support any of the hooks. - using type = CustomHashType<>; - EXPECT_FALSE(is_hashable<type>()); - EXPECT_FALSE(is_hashable<const type>()); - EXPECT_FALSE(is_hashable<const type&>()); -#endif // ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_ -} - -template <InvokeTag Tag, typename... T> -void TestCustomHashType(InvokeTagConstant<Tag> tag, T... t) { - constexpr auto next = static_cast<InvokeTag>(static_cast<int>(Tag) + 1); - TestCustomHashType(InvokeTagConstant<next>(), tag, t...); - TestCustomHashType(InvokeTagConstant<next>(), t...); -} - -TEST(HashTest, CustomHashType) { - TestCustomHashType(InvokeTagConstant<InvokeTag{}>()); -} - -TEST(HashTest, NoOpsAreEquivalent) { - EXPECT_EQ(Hash<NoOp>()({}), Hash<NoOp>()({})); - EXPECT_EQ(Hash<NoOp>()({}), Hash<EmptyCombine>()({})); -} - -template <typename T> -class HashIntTest : public testing::Test { -}; -TYPED_TEST_SUITE_P(HashIntTest); - -TYPED_TEST_P(HashIntTest, BasicUsage) { - EXPECT_NE(Hash<NoOp>()({}), Hash<TypeParam>()(0)); - EXPECT_NE(Hash<NoOp>()({}), - Hash<TypeParam>()(std::numeric_limits<TypeParam>::max())); - if (std::numeric_limits<TypeParam>::min() != 0) { - EXPECT_NE(Hash<NoOp>()({}), - Hash<TypeParam>()(std::numeric_limits<TypeParam>::min())); - } - - EXPECT_EQ(Hash<CombineIterative<TypeParam>>()({}), - Hash<CombineVariadic<TypeParam>>()({})); -} - -REGISTER_TYPED_TEST_CASE_P(HashIntTest, BasicUsage); -using IntTypes = testing::Types<unsigned char, char, int, int32_t, int64_t, - uint32_t, uint64_t, size_t>; -INSTANTIATE_TYPED_TEST_CASE_P(My, HashIntTest, IntTypes); - -struct StructWithPadding { - char c; - int i; - - template <typename H> - friend H AbslHashValue(H hash_state, const StructWithPadding& s) { - return H::combine(std::move(hash_state), s.c, s.i); - } -}; - -static_assert(sizeof(StructWithPadding) > sizeof(char) + sizeof(int), - "StructWithPadding doesn't have padding"); -static_assert(std::is_standard_layout<StructWithPadding>::value, ""); - -// This check has to be disabled because libstdc++ doesn't support it. -// static_assert(std::is_trivially_constructible<StructWithPadding>::value, ""); - -template <typename T> -struct ArraySlice { - T* begin; - T* end; - - template <typename H> - friend H AbslHashValue(H hash_state, const ArraySlice& slice) { - for (auto t = slice.begin; t != slice.end; ++t) { - hash_state = H::combine(std::move(hash_state), *t); - } - return hash_state; - } -}; - -TEST(HashTest, HashNonUniquelyRepresentedType) { - // Create equal StructWithPadding objects that are known to have non-equal - // padding bytes. - static const size_t kNumStructs = 10; - unsigned char buffer1[kNumStructs * sizeof(StructWithPadding)]; - std::memset(buffer1, 0, sizeof(buffer1)); - auto* s1 = reinterpret_cast<StructWithPadding*>(buffer1); - - unsigned char buffer2[kNumStructs * sizeof(StructWithPadding)]; - std::memset(buffer2, 255, sizeof(buffer2)); - auto* s2 = reinterpret_cast<StructWithPadding*>(buffer2); - for (int i = 0; i < kNumStructs; ++i) { - SCOPED_TRACE(i); - s1[i].c = s2[i].c = '0' + i; - s1[i].i = s2[i].i = i; - ASSERT_FALSE(memcmp(buffer1 + i * sizeof(StructWithPadding), - buffer2 + i * sizeof(StructWithPadding), - sizeof(StructWithPadding)) == 0) - << "Bug in test code: objects do not have unequal" - << " object representations"; - } - - EXPECT_EQ(Hash<StructWithPadding>()(s1[0]), Hash<StructWithPadding>()(s2[0])); - EXPECT_EQ(Hash<ArraySlice<StructWithPadding>>()({s1, s1 + kNumStructs}), - Hash<ArraySlice<StructWithPadding>>()({s2, s2 + kNumStructs})); -} - -TEST(HashTest, StandardHashContainerUsage) { - std::unordered_map<int, std::string, Hash<int>> map = {{0, "foo"}, - {42, "bar"}}; - - EXPECT_NE(map.find(0), map.end()); - EXPECT_EQ(map.find(1), map.end()); - EXPECT_NE(map.find(0u), map.end()); -} - -struct ConvertibleFromNoOp { - ConvertibleFromNoOp(NoOp) {} // NOLINT(runtime/explicit) - - template <typename H> - friend H AbslHashValue(H hash_state, ConvertibleFromNoOp) { - return H::combine(std::move(hash_state), 1); - } -}; - -TEST(HashTest, HeterogeneousCall) { - EXPECT_NE(Hash<ConvertibleFromNoOp>()(NoOp()), - Hash<NoOp>()(NoOp())); -} - -TEST(IsUniquelyRepresentedTest, SanityTest) { - using absl::hash_internal::is_uniquely_represented; - - EXPECT_TRUE(is_uniquely_represented<unsigned char>::value); - EXPECT_TRUE(is_uniquely_represented<int>::value); - EXPECT_FALSE(is_uniquely_represented<bool>::value); - EXPECT_FALSE(is_uniquely_represented<int*>::value); -} - -struct IntAndString { - int i; - std::string s; - - template <typename H> - friend H AbslHashValue(H hash_state, IntAndString int_and_string) { - return H::combine(std::move(hash_state), int_and_string.s, - int_and_string.i); - } -}; - -TEST(HashTest, SmallValueOn64ByteBoundary) { - Hash<IntAndString>()(IntAndString{0, std::string(63, '0')}); -} - -struct TypeErased { - size_t n; - - template <typename H> - friend H AbslHashValue(H hash_state, const TypeErased& v) { - v.HashValue(absl::HashState::Create(&hash_state)); - return hash_state; - } - - void HashValue(absl::HashState state) const { - absl::HashState::combine(std::move(state), n); - } -}; - -TEST(HashTest, TypeErased) { - EXPECT_TRUE((is_hashable<TypeErased>::value)); - EXPECT_TRUE((is_hashable<std::pair<TypeErased, int>>::value)); - - EXPECT_EQ(SpyHash(TypeErased{7}), SpyHash(size_t{7})); - EXPECT_NE(SpyHash(TypeErased{7}), SpyHash(size_t{13})); - - EXPECT_EQ(SpyHash(std::make_pair(TypeErased{7}, 17)), - SpyHash(std::make_pair(size_t{7}, 17))); -} - -struct ValueWithBoolConversion { - operator bool() const { return false; } - int i; -}; - -} // namespace -namespace std { -template <> -struct hash<ValueWithBoolConversion> { - size_t operator()(ValueWithBoolConversion v) { return v.i; } -}; -} // namespace std - -namespace { - -TEST(HashTest, DoesNotUseImplicitConversionsToBool) { - EXPECT_NE(absl::Hash<ValueWithBoolConversion>()(ValueWithBoolConversion{0}), - absl::Hash<ValueWithBoolConversion>()(ValueWithBoolConversion{1})); -} - -} // namespace diff --git a/third_party/abseil_cpp/absl/hash/hash_testing.h b/third_party/abseil_cpp/absl/hash/hash_testing.h deleted file mode 100644 index 1e1c5741491e..000000000000 --- a/third_party/abseil_cpp/absl/hash/hash_testing.h +++ /dev/null @@ -1,378 +0,0 @@ -// 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. - -#ifndef ABSL_HASH_HASH_TESTING_H_ -#define ABSL_HASH_HASH_TESTING_H_ - -#include <initializer_list> -#include <tuple> -#include <type_traits> -#include <vector> - -#include "gmock/gmock.h" -#include "gtest/gtest.h" -#include "absl/hash/internal/spy_hash_state.h" -#include "absl/meta/type_traits.h" -#include "absl/strings/str_cat.h" -#include "absl/types/variant.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN - -// Run the absl::Hash algorithm over all the elements passed in and verify that -// their hash expansion is congruent with their `==` operator. -// -// It is used in conjunction with EXPECT_TRUE. Failures will output information -// on what requirement failed and on which objects. -// -// Users should pass a collection of types as either an initializer list or a -// container of cases. -// -// EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly( -// {v1, v2, ..., vN})); -// -// std::vector<MyType> cases; -// // Fill cases... -// EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(cases)); -// -// Users can pass a variety of types for testing heterogeneous lookup with -// `std::make_tuple`: -// -// EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly( -// std::make_tuple(v1, v2, ..., vN))); -// -// -// Ideally, the values passed should provide enough coverage of the `==` -// operator and the AbslHashValue implementations. -// For dynamically sized types, the empty state should usually be included in -// the values. -// -// The function accepts an optional comparator function, in case that `==` is -// not enough for the values provided. -// -// Usage: -// -// EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly( -// std::make_tuple(v1, v2, ..., vN), MyCustomEq{})); -// -// It checks the following requirements: -// 1. The expansion for a value is deterministic. -// 2. For any two objects `a` and `b` in the sequence, if `a == b` evaluates -// to true, then their hash expansion must be equal. -// 3. If `a == b` evaluates to false their hash expansion must be unequal. -// 4. If `a == b` evaluates to false neither hash expansion can be a -// suffix of the other. -// 5. AbslHashValue overloads should not be called by the user. They are only -// meant to be called by the framework. Users should call H::combine() and -// H::combine_contiguous(). -// 6. No moved-from instance of the hash state is used in the implementation -// of AbslHashValue. -// -// The values do not have to have the same type. This can be useful for -// equivalent types that support heterogeneous lookup. -// -// A possible reason for breaking (2) is combining state in the hash expansion -// that was not used in `==`. -// For example: -// -// struct Bad2 { -// int a, b; -// template <typename H> -// friend H AbslHashValue(H state, Bad2 x) { -// // Uses a and b. -// return H::combine(std::move(state), x.a, x.b); -// } -// friend bool operator==(Bad2 x, Bad2 y) { -// // Only uses a. -// return x.a == y.a; -// } -// }; -// -// As for (3), breaking this usually means that there is state being passed to -// the `==` operator that is not used in the hash expansion. -// For example: -// -// struct Bad3 { -// int a, b; -// template <typename H> -// friend H AbslHashValue(H state, Bad3 x) { -// // Only uses a. -// return H::combine(std::move(state), x.a); -// } -// friend bool operator==(Bad3 x, Bad3 y) { -// // Uses a and b. -// return x.a == y.a && x.b == y.b; -// } -// }; -// -// Finally, a common way to break 4 is by combining dynamic ranges without -// combining the size of the range. -// For example: -// -// struct Bad4 { -// int *p, size; -// template <typename H> -// friend H AbslHashValue(H state, Bad4 x) { -// return H::combine_contiguous(std::move(state), x.p, x.p + x.size); -// } -// friend bool operator==(Bad4 x, Bad4 y) { -// // Compare two ranges for equality. C++14 code can instead use std::equal. -// return absl::equal(x.p, x.p + x.size, y.p, y.p + y.size); -// } -// }; -// -// An easy solution to this is to combine the size after combining the range, -// like so: -// template <typename H> -// friend H AbslHashValue(H state, Bad4 x) { -// return H::combine( -// H::combine_contiguous(std::move(state), x.p, x.p + x.size), x.size); -// } -// -template <int&... ExplicitBarrier, typename Container> -ABSL_MUST_USE_RESULT testing::AssertionResult -VerifyTypeImplementsAbslHashCorrectly(const Container& values); - -template <int&... ExplicitBarrier, typename Container, typename Eq> -ABSL_MUST_USE_RESULT testing::AssertionResult -VerifyTypeImplementsAbslHashCorrectly(const Container& values, Eq equals); - -template <int&..., typename T> -ABSL_MUST_USE_RESULT testing::AssertionResult -VerifyTypeImplementsAbslHashCorrectly(std::initializer_list<T> values); - -template <int&..., typename T, typename Eq> -ABSL_MUST_USE_RESULT testing::AssertionResult -VerifyTypeImplementsAbslHashCorrectly(std::initializer_list<T> values, - Eq equals); - -namespace hash_internal { - -struct PrintVisitor { - size_t index; - template <typename T> - std::string operator()(const T* value) const { - return absl::StrCat("#", index, "(", testing::PrintToString(*value), ")"); - } -}; - -template <typename Eq> -struct EqVisitor { - Eq eq; - template <typename T, typename U> - bool operator()(const T* t, const U* u) const { - return eq(*t, *u); - } -}; - -struct ExpandVisitor { - template <typename T> - SpyHashState operator()(const T* value) const { - return SpyHashState::combine(SpyHashState(), *value); - } -}; - -template <typename Container, typename Eq> -ABSL_MUST_USE_RESULT testing::AssertionResult -VerifyTypeImplementsAbslHashCorrectly(const Container& values, Eq equals) { - using V = typename Container::value_type; - - struct Info { - const V& value; - size_t index; - std::string ToString() const { - return absl::visit(PrintVisitor{index}, value); - } - SpyHashState expand() const { return absl::visit(ExpandVisitor{}, value); } - }; - - using EqClass = std::vector<Info>; - std::vector<EqClass> classes; - - // Gather the values in equivalence classes. - size_t i = 0; - for (const auto& value : values) { - EqClass* c = nullptr; - for (auto& eqclass : classes) { - if (absl::visit(EqVisitor<Eq>{equals}, value, eqclass[0].value)) { - c = &eqclass; - break; - } - } - if (c == nullptr) { - classes.emplace_back(); - c = &classes.back(); - } - c->push_back({value, i}); - ++i; - - // Verify potential errors captured by SpyHashState. - if (auto error = c->back().expand().error()) { - return testing::AssertionFailure() << *error; - } - } - - if (classes.size() < 2) { - return testing::AssertionFailure() - << "At least two equivalence classes are expected."; - } - - // We assume that equality is correctly implemented. - // Now we verify that AbslHashValue is also correctly implemented. - - for (const auto& c : classes) { - // All elements of the equivalence class must have the same hash - // expansion. - const SpyHashState expected = c[0].expand(); - for (const Info& v : c) { - if (v.expand() != v.expand()) { - return testing::AssertionFailure() - << "Hash expansion for " << v.ToString() - << " is non-deterministic."; - } - if (v.expand() != expected) { - return testing::AssertionFailure() - << "Values " << c[0].ToString() << " and " << v.ToString() - << " evaluate as equal but have an unequal hash expansion."; - } - } - - // Elements from other classes must have different hash expansion. - for (const auto& c2 : classes) { - if (&c == &c2) continue; - const SpyHashState c2_hash = c2[0].expand(); - switch (SpyHashState::Compare(expected, c2_hash)) { - case SpyHashState::CompareResult::kEqual: - return testing::AssertionFailure() - << "Values " << c[0].ToString() << " and " << c2[0].ToString() - << " evaluate as unequal but have an equal hash expansion."; - case SpyHashState::CompareResult::kBSuffixA: - return testing::AssertionFailure() - << "Hash expansion of " << c2[0].ToString() - << " is a suffix of the hash expansion of " << c[0].ToString() - << "."; - case SpyHashState::CompareResult::kASuffixB: - return testing::AssertionFailure() - << "Hash expansion of " << c[0].ToString() - << " is a suffix of the hash expansion of " << c2[0].ToString() - << "."; - case SpyHashState::CompareResult::kUnequal: - break; - } - } - } - return testing::AssertionSuccess(); -} - -template <typename... T> -struct TypeSet { - template <typename U, bool = disjunction<std::is_same<T, U>...>::value> - struct Insert { - using type = TypeSet<U, T...>; - }; - template <typename U> - struct Insert<U, true> { - using type = TypeSet; - }; - - template <template <typename...> class C> - using apply = C<T...>; -}; - -template <typename... T> -struct MakeTypeSet : TypeSet<> {}; -template <typename T, typename... Ts> -struct MakeTypeSet<T, Ts...> : MakeTypeSet<Ts...>::template Insert<T>::type {}; - -template <typename... T> -using VariantForTypes = typename MakeTypeSet< - const typename std::decay<T>::type*...>::template apply<absl::variant>; - -template <typename Container> -struct ContainerAsVector { - using V = absl::variant<const typename Container::value_type*>; - using Out = std::vector<V>; - - static Out Do(const Container& values) { - Out out; - for (const auto& v : values) out.push_back(&v); - return out; - } -}; - -template <typename... T> -struct ContainerAsVector<std::tuple<T...>> { - using V = VariantForTypes<T...>; - using Out = std::vector<V>; - - template <size_t... I> - static Out DoImpl(const std::tuple<T...>& tuple, absl::index_sequence<I...>) { - return Out{&std::get<I>(tuple)...}; - } - - static Out Do(const std::tuple<T...>& values) { - return DoImpl(values, absl::index_sequence_for<T...>()); - } -}; - -template <> -struct ContainerAsVector<std::tuple<>> { - static std::vector<VariantForTypes<int>> Do(std::tuple<>) { return {}; } -}; - -struct DefaultEquals { - template <typename T, typename U> - bool operator()(const T& t, const U& u) const { - return t == u; - } -}; - -} // namespace hash_internal - -template <int&..., typename Container> -ABSL_MUST_USE_RESULT testing::AssertionResult -VerifyTypeImplementsAbslHashCorrectly(const Container& values) { - return hash_internal::VerifyTypeImplementsAbslHashCorrectly( - hash_internal::ContainerAsVector<Container>::Do(values), - hash_internal::DefaultEquals{}); -} - -template <int&..., typename Container, typename Eq> -ABSL_MUST_USE_RESULT testing::AssertionResult -VerifyTypeImplementsAbslHashCorrectly(const Container& values, Eq equals) { - return hash_internal::VerifyTypeImplementsAbslHashCorrectly( - hash_internal::ContainerAsVector<Container>::Do(values), equals); -} - -template <int&..., typename T> -ABSL_MUST_USE_RESULT testing::AssertionResult -VerifyTypeImplementsAbslHashCorrectly(std::initializer_list<T> values) { - return hash_internal::VerifyTypeImplementsAbslHashCorrectly( - hash_internal::ContainerAsVector<std::initializer_list<T>>::Do(values), - hash_internal::DefaultEquals{}); -} - -template <int&..., typename T, typename Eq> -ABSL_MUST_USE_RESULT testing::AssertionResult -VerifyTypeImplementsAbslHashCorrectly(std::initializer_list<T> values, - Eq equals) { - return hash_internal::VerifyTypeImplementsAbslHashCorrectly( - hash_internal::ContainerAsVector<std::initializer_list<T>>::Do(values), - equals); -} - -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_HASH_HASH_TESTING_H_ diff --git a/third_party/abseil_cpp/absl/hash/internal/city.cc b/third_party/abseil_cpp/absl/hash/internal/city.cc deleted file mode 100644 index 5460134e5762..000000000000 --- a/third_party/abseil_cpp/absl/hash/internal/city.cc +++ /dev/null @@ -1,349 +0,0 @@ -// 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. -// -// This file provides CityHash64() and related functions. -// -// It's probably possible to create even faster hash functions by -// writing a program that systematically explores some of the space of -// possible hash functions, by using SIMD instructions, or by -// compromising on hash quality. - -#include "absl/hash/internal/city.h" - -#include <string.h> // for memcpy and memset -#include <algorithm> - -#include "absl/base/config.h" -#include "absl/base/internal/endian.h" -#include "absl/base/internal/unaligned_access.h" -#include "absl/base/optimization.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace hash_internal { - -#ifdef ABSL_IS_BIG_ENDIAN -#define uint32_in_expected_order(x) (absl::gbswap_32(x)) -#define uint64_in_expected_order(x) (absl::gbswap_64(x)) -#else -#define uint32_in_expected_order(x) (x) -#define uint64_in_expected_order(x) (x) -#endif - -static uint64_t Fetch64(const char *p) { - return uint64_in_expected_order(ABSL_INTERNAL_UNALIGNED_LOAD64(p)); -} - -static uint32_t Fetch32(const char *p) { - return uint32_in_expected_order(ABSL_INTERNAL_UNALIGNED_LOAD32(p)); -} - -// Some primes between 2^63 and 2^64 for various uses. -static const uint64_t k0 = 0xc3a5c85c97cb3127ULL; -static const uint64_t k1 = 0xb492b66fbe98f273ULL; -static const uint64_t k2 = 0x9ae16a3b2f90404fULL; - -// Magic numbers for 32-bit hashing. Copied from Murmur3. -static const uint32_t c1 = 0xcc9e2d51; -static const uint32_t c2 = 0x1b873593; - -// A 32-bit to 32-bit integer hash copied from Murmur3. -static uint32_t fmix(uint32_t h) { - h ^= h >> 16; - h *= 0x85ebca6b; - h ^= h >> 13; - h *= 0xc2b2ae35; - h ^= h >> 16; - return h; -} - -static uint32_t Rotate32(uint32_t val, int shift) { - // Avoid shifting by 32: doing so yields an undefined result. - return shift == 0 ? val : ((val >> shift) | (val << (32 - shift))); -} - -#undef PERMUTE3 -#define PERMUTE3(a, b, c) \ - do { \ - std::swap(a, b); \ - std::swap(a, c); \ - } while (0) - -static uint32_t Mur(uint32_t a, uint32_t h) { - // Helper from Murmur3 for combining two 32-bit values. - a *= c1; - a = Rotate32(a, 17); - a *= c2; - h ^= a; - h = Rotate32(h, 19); - return h * 5 + 0xe6546b64; -} - -static uint32_t Hash32Len13to24(const char *s, size_t len) { - uint32_t a = Fetch32(s - 4 + (len >> 1)); - uint32_t b = Fetch32(s + 4); - uint32_t c = Fetch32(s + len - 8); - uint32_t d = Fetch32(s + (len >> 1)); - uint32_t e = Fetch32(s); - uint32_t f = Fetch32(s + len - 4); - uint32_t h = len; - - return fmix(Mur(f, Mur(e, Mur(d, Mur(c, Mur(b, Mur(a, h))))))); -} - -static uint32_t Hash32Len0to4(const char *s, size_t len) { - uint32_t b = 0; - uint32_t c = 9; - for (size_t i = 0; i < len; i++) { - signed char v = s[i]; - b = b * c1 + v; - c ^= b; - } - return fmix(Mur(b, Mur(len, c))); -} - -static uint32_t Hash32Len5to12(const char *s, size_t len) { - uint32_t a = len, b = len * 5, c = 9, d = b; - a += Fetch32(s); - b += Fetch32(s + len - 4); - c += Fetch32(s + ((len >> 1) & 4)); - return fmix(Mur(c, Mur(b, Mur(a, d)))); -} - -uint32_t CityHash32(const char *s, size_t len) { - if (len <= 24) { - return len <= 12 - ? (len <= 4 ? Hash32Len0to4(s, len) : Hash32Len5to12(s, len)) - : Hash32Len13to24(s, len); - } - - // len > 24 - uint32_t h = len, g = c1 * len, f = g; - - uint32_t a0 = Rotate32(Fetch32(s + len - 4) * c1, 17) * c2; - uint32_t a1 = Rotate32(Fetch32(s + len - 8) * c1, 17) * c2; - uint32_t a2 = Rotate32(Fetch32(s + len - 16) * c1, 17) * c2; - uint32_t a3 = Rotate32(Fetch32(s + len - 12) * c1, 17) * c2; - uint32_t a4 = Rotate32(Fetch32(s + len - 20) * c1, 17) * c2; - h ^= a0; - h = Rotate32(h, 19); - h = h * 5 + 0xe6546b64; - h ^= a2; - h = Rotate32(h, 19); - h = h * 5 + 0xe6546b64; - g ^= a1; - g = Rotate32(g, 19); - g = g * 5 + 0xe6546b64; - g ^= a3; - g = Rotate32(g, 19); - g = g * 5 + 0xe6546b64; - f += a4; - f = Rotate32(f, 19); - f = f * 5 + 0xe6546b64; - size_t iters = (len - 1) / 20; - do { - uint32_t b0 = Rotate32(Fetch32(s) * c1, 17) * c2; - uint32_t b1 = Fetch32(s + 4); - uint32_t b2 = Rotate32(Fetch32(s + 8) * c1, 17) * c2; - uint32_t b3 = Rotate32(Fetch32(s + 12) * c1, 17) * c2; - uint32_t b4 = Fetch32(s + 16); - h ^= b0; - h = Rotate32(h, 18); - h = h * 5 + 0xe6546b64; - f += b1; - f = Rotate32(f, 19); - f = f * c1; - g += b2; - g = Rotate32(g, 18); - g = g * 5 + 0xe6546b64; - h ^= b3 + b1; - h = Rotate32(h, 19); - h = h * 5 + 0xe6546b64; - g ^= b4; - g = absl::gbswap_32(g) * 5; - h += b4 * 5; - h = absl::gbswap_32(h); - f += b0; - PERMUTE3(f, h, g); - s += 20; - } while (--iters != 0); - g = Rotate32(g, 11) * c1; - g = Rotate32(g, 17) * c1; - f = Rotate32(f, 11) * c1; - f = Rotate32(f, 17) * c1; - h = Rotate32(h + g, 19); - h = h * 5 + 0xe6546b64; - h = Rotate32(h, 17) * c1; - h = Rotate32(h + f, 19); - h = h * 5 + 0xe6546b64; - h = Rotate32(h, 17) * c1; - return h; -} - -// Bitwise right rotate. Normally this will compile to a single -// instruction, especially if the shift is a manifest constant. -static uint64_t Rotate(uint64_t val, int shift) { - // Avoid shifting by 64: doing so yields an undefined result. - return shift == 0 ? val : ((val >> shift) | (val << (64 - shift))); -} - -static uint64_t ShiftMix(uint64_t val) { return val ^ (val >> 47); } - -static uint64_t HashLen16(uint64_t u, uint64_t v, uint64_t mul) { - // Murmur-inspired hashing. - uint64_t a = (u ^ v) * mul; - a ^= (a >> 47); - uint64_t b = (v ^ a) * mul; - b ^= (b >> 47); - b *= mul; - return b; -} - -static uint64_t HashLen16(uint64_t u, uint64_t v) { - const uint64_t kMul = 0x9ddfea08eb382d69ULL; - return HashLen16(u, v, kMul); -} - -static uint64_t HashLen0to16(const char *s, size_t len) { - if (len >= 8) { - uint64_t mul = k2 + len * 2; - uint64_t a = Fetch64(s) + k2; - uint64_t b = Fetch64(s + len - 8); - uint64_t c = Rotate(b, 37) * mul + a; - uint64_t d = (Rotate(a, 25) + b) * mul; - return HashLen16(c, d, mul); - } - if (len >= 4) { - uint64_t mul = k2 + len * 2; - uint64_t a = Fetch32(s); - return HashLen16(len + (a << 3), Fetch32(s + len - 4), mul); - } - if (len > 0) { - uint8_t a = s[0]; - uint8_t b = s[len >> 1]; - uint8_t c = s[len - 1]; - uint32_t y = static_cast<uint32_t>(a) + (static_cast<uint32_t>(b) << 8); - uint32_t z = len + (static_cast<uint32_t>(c) << 2); - return ShiftMix(y * k2 ^ z * k0) * k2; - } - return k2; -} - -// This probably works well for 16-byte strings as well, but it may be overkill -// in that case. -static uint64_t HashLen17to32(const char *s, size_t len) { - uint64_t mul = k2 + len * 2; - uint64_t a = Fetch64(s) * k1; - uint64_t b = Fetch64(s + 8); - uint64_t c = Fetch64(s + len - 8) * mul; - uint64_t d = Fetch64(s + len - 16) * k2; - return HashLen16(Rotate(a + b, 43) + Rotate(c, 30) + d, - a + Rotate(b + k2, 18) + c, mul); -} - -// Return a 16-byte hash for 48 bytes. Quick and dirty. -// Callers do best to use "random-looking" values for a and b. -static std::pair<uint64_t, uint64_t> WeakHashLen32WithSeeds( - uint64_t w, uint64_t x, uint64_t y, uint64_t z, uint64_t a, uint64_t b) { - a += w; - b = Rotate(b + a + z, 21); - uint64_t c = a; - a += x; - a += y; - b += Rotate(a, 44); - return std::make_pair(a + z, b + c); -} - -// Return a 16-byte hash for s[0] ... s[31], a, and b. Quick and dirty. -static std::pair<uint64_t, uint64_t> WeakHashLen32WithSeeds(const char *s, - uint64_t a, - uint64_t b) { - return WeakHashLen32WithSeeds(Fetch64(s), Fetch64(s + 8), Fetch64(s + 16), - Fetch64(s + 24), a, b); -} - -// Return an 8-byte hash for 33 to 64 bytes. -static uint64_t HashLen33to64(const char *s, size_t len) { - uint64_t mul = k2 + len * 2; - uint64_t a = Fetch64(s) * k2; - uint64_t b = Fetch64(s + 8); - uint64_t c = Fetch64(s + len - 24); - uint64_t d = Fetch64(s + len - 32); - uint64_t e = Fetch64(s + 16) * k2; - uint64_t f = Fetch64(s + 24) * 9; - uint64_t g = Fetch64(s + len - 8); - uint64_t h = Fetch64(s + len - 16) * mul; - uint64_t u = Rotate(a + g, 43) + (Rotate(b, 30) + c) * 9; - uint64_t v = ((a + g) ^ d) + f + 1; - uint64_t w = absl::gbswap_64((u + v) * mul) + h; - uint64_t x = Rotate(e + f, 42) + c; - uint64_t y = (absl::gbswap_64((v + w) * mul) + g) * mul; - uint64_t z = e + f + c; - a = absl::gbswap_64((x + z) * mul + y) + b; - b = ShiftMix((z + a) * mul + d + h) * mul; - return b + x; -} - -uint64_t CityHash64(const char *s, size_t len) { - if (len <= 32) { - if (len <= 16) { - return HashLen0to16(s, len); - } else { - return HashLen17to32(s, len); - } - } else if (len <= 64) { - return HashLen33to64(s, len); - } - - // For strings over 64 bytes we hash the end first, and then as we - // loop we keep 56 bytes of state: v, w, x, y, and z. - uint64_t x = Fetch64(s + len - 40); - uint64_t y = Fetch64(s + len - 16) + Fetch64(s + len - 56); - uint64_t z = HashLen16(Fetch64(s + len - 48) + len, Fetch64(s + len - 24)); - std::pair<uint64_t, uint64_t> v = - WeakHashLen32WithSeeds(s + len - 64, len, z); - std::pair<uint64_t, uint64_t> w = - WeakHashLen32WithSeeds(s + len - 32, y + k1, x); - x = x * k1 + Fetch64(s); - - // Decrease len to the nearest multiple of 64, and operate on 64-byte chunks. - len = (len - 1) & ~static_cast<size_t>(63); - do { - x = Rotate(x + y + v.first + Fetch64(s + 8), 37) * k1; - y = Rotate(y + v.second + Fetch64(s + 48), 42) * k1; - x ^= w.second; - y += v.first + Fetch64(s + 40); - z = Rotate(z + w.first, 33) * k1; - v = WeakHashLen32WithSeeds(s, v.second * k1, x + w.first); - w = WeakHashLen32WithSeeds(s + 32, z + w.second, y + Fetch64(s + 16)); - std::swap(z, x); - s += 64; - len -= 64; - } while (len != 0); - return HashLen16(HashLen16(v.first, w.first) + ShiftMix(y) * k1 + z, - HashLen16(v.second, w.second) + x); -} - -uint64_t CityHash64WithSeed(const char *s, size_t len, uint64_t seed) { - return CityHash64WithSeeds(s, len, k2, seed); -} - -uint64_t CityHash64WithSeeds(const char *s, size_t len, uint64_t seed0, - uint64_t seed1) { - return HashLen16(CityHash64(s, len) - seed0, seed1); -} - -} // namespace hash_internal -ABSL_NAMESPACE_END -} // namespace absl diff --git a/third_party/abseil_cpp/absl/hash/internal/city.h b/third_party/abseil_cpp/absl/hash/internal/city.h deleted file mode 100644 index 393da0b95d9f..000000000000 --- a/third_party/abseil_cpp/absl/hash/internal/city.h +++ /dev/null @@ -1,78 +0,0 @@ -// 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. -// -// https://code.google.com/p/cityhash/ -// -// This file provides a few functions for hashing strings. All of them are -// high-quality functions in the sense that they pass standard tests such -// as Austin Appleby's SMHasher. They are also fast. -// -// For 64-bit x86 code, on short strings, we don't know of anything faster than -// CityHash64 that is of comparable quality. We believe our nearest competitor -// is Murmur3. For 64-bit x86 code, CityHash64 is an excellent choice for hash -// tables and most other hashing (excluding cryptography). -// -// For 32-bit x86 code, we don't know of anything faster than CityHash32 that -// is of comparable quality. We believe our nearest competitor is Murmur3A. -// (On 64-bit CPUs, it is typically faster to use the other CityHash variants.) -// -// Functions in the CityHash family are not suitable for cryptography. -// -// Please see CityHash's README file for more details on our performance -// measurements and so on. -// -// WARNING: This code has been only lightly tested on big-endian platforms! -// It is known to work well on little-endian platforms that have a small penalty -// for unaligned reads, such as current Intel and AMD moderate-to-high-end CPUs. -// It should work on all 32-bit and 64-bit platforms that allow unaligned reads; -// bug reports are welcome. -// -// By the way, for some hash functions, given strings a and b, the hash -// of a+b is easily derived from the hashes of a and b. This property -// doesn't hold for any hash functions in this file. - -#ifndef ABSL_HASH_INTERNAL_CITY_H_ -#define ABSL_HASH_INTERNAL_CITY_H_ - -#include <stdint.h> -#include <stdlib.h> // for size_t. - -#include <utility> - -#include "absl/base/config.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace hash_internal { - -// Hash function for a byte array. -uint64_t CityHash64(const char *s, size_t len); - -// Hash function for a byte array. For convenience, a 64-bit seed is also -// hashed into the result. -uint64_t CityHash64WithSeed(const char *s, size_t len, uint64_t seed); - -// Hash function for a byte array. For convenience, two seeds are also -// hashed into the result. -uint64_t CityHash64WithSeeds(const char *s, size_t len, uint64_t seed0, - uint64_t seed1); - -// Hash function for a byte array. Most useful in 32-bit binaries. -uint32_t CityHash32(const char *s, size_t len); - -} // namespace hash_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_HASH_INTERNAL_CITY_H_ diff --git a/third_party/abseil_cpp/absl/hash/internal/city_test.cc b/third_party/abseil_cpp/absl/hash/internal/city_test.cc deleted file mode 100644 index 251d381d73e1..000000000000 --- a/third_party/abseil_cpp/absl/hash/internal/city_test.cc +++ /dev/null @@ -1,595 +0,0 @@ -// 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/hash/internal/city.h" - -#include <string.h> -#include <cstdio> -#include <iostream> -#include "gtest/gtest.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace hash_internal { - -static const uint64_t k0 = 0xc3a5c85c97cb3127ULL; -static const uint64_t kSeed0 = 1234567; -static const uint64_t kSeed1 = k0; -static const int kDataSize = 1 << 20; -static const int kTestSize = 300; - -static char data[kDataSize]; - -// Initialize data to pseudorandom values. -void setup() { - uint64_t a = 9; - uint64_t b = 777; - for (int i = 0; i < kDataSize; i++) { - a += b; - b += a; - a = (a ^ (a >> 41)) * k0; - b = (b ^ (b >> 41)) * k0 + i; - uint8_t u = b >> 37; - memcpy(data + i, &u, 1); // uint8_t -> char - } -} - -#define C(x) 0x##x##ULL -static const uint64_t testdata[kTestSize][4] = { - {C(9ae16a3b2f90404f), C(75106db890237a4a), C(3feac5f636039766), - C(dc56d17a)}, - {C(541150e87f415e96), C(1aef0d24b3148a1a), C(bacc300e1e82345a), - C(99929334)}, - {C(f3786a4b25827c1), C(34ee1a2bf767bd1c), C(2f15ca2ebfb631f2), C(4252edb7)}, - {C(ef923a7a1af78eab), C(79163b1e1e9a9b18), C(df3b2aca6e1e4a30), - C(ebc34f3c)}, - {C(11df592596f41d88), C(843ec0bce9042f9c), C(cce2ea1e08b1eb30), - C(26f2b463)}, - {C(831f448bdc5600b3), C(62a24be3120a6919), C(1b44098a41e010da), - C(b042c047)}, - {C(3eca803e70304894), C(d80de767e4a920a), C(a51cfbb292efd53d), C(e73bb0a8)}, - {C(1b5a063fb4c7f9f1), C(318dbc24af66dee9), C(10ef7b32d5c719af), - C(91dfdd75)}, - {C(a0f10149a0e538d6), C(69d008c20f87419f), C(41b36376185b3e9e), - C(c87f95de)}, - {C(fb8d9c70660b910b), C(a45b0cc3476bff1b), C(b28d1996144f0207), - C(3f5538ef)}, - {C(236827beae282a46), C(e43970221139c946), C(4f3ac6faa837a3aa), - C(70eb1a1f)}, - {C(c385e435136ecf7c), C(d9d17368ff6c4a08), C(1b31eed4e5251a67), - C(cfd63b83)}, - {C(e3f6828b6017086d), C(21b4d1900554b3b0), C(bef38be1809e24f1), - C(894a52ef)}, - {C(851fff285561dca0), C(4d1277d73cdf416f), C(28ccffa61010ebe2), - C(9cde6a54)}, - {C(61152a63595a96d9), C(d1a3a91ef3a7ba45), C(443b6bb4a493ad0c), - C(6c4898d5)}, - {C(44473e03be306c88), C(30097761f872472a), C(9fd1b669bfad82d7), - C(13e1978e)}, - {C(3ead5f21d344056), C(fb6420393cfb05c3), C(407932394cbbd303), C(51b4ba8)}, - {C(6abbfde37ee03b5b), C(83febf188d2cc113), C(cda7b62d94d5b8ee), - C(b6b06e40)}, - {C(943e7ed63b3c080), C(1ef207e9444ef7f8), C(ef4a9f9f8c6f9b4a), C(240a2f2)}, - {C(d72ce05171ef8a1a), C(c6bd6bd869203894), C(c760e6396455d23a), - C(5dcefc30)}, - {C(4182832b52d63735), C(337097e123eea414), C(b5a72ca0456df910), - C(7a48b105)}, - {C(d6cdae892584a2cb), C(58de0fa4eca17dcd), C(43df30b8f5f1cb00), - C(fd55007b)}, - {C(5c8e90bc267c5ee4), C(e9ae044075d992d9), C(f234cbfd1f0a1e59), - C(6b95894c)}, - {C(bbd7f30ac310a6f3), C(b23b570d2666685f), C(fb13fb08c9814fe7), - C(3360e827)}, - {C(36a097aa49519d97), C(8204380a73c4065), C(77c2004bdd9e276a), C(45177e0b)}, - {C(dc78cb032c49217), C(112464083f83e03a), C(96ae53e28170c0f5), C(7c6fffe4)}, - {C(441593e0da922dfe), C(936ef46061469b32), C(204a1921197ddd87), - C(bbc78da4)}, - {C(2ba3883d71cc2133), C(72f2bbb32bed1a3c), C(27e1bd96d4843251), - C(c5c25d39)}, - {C(f2b6d2adf8423600), C(7514e2f016a48722), C(43045743a50396ba), - 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C(c4306af6)}, - {C(534cc35f0ee1eb4e), C(b703820f1f3b3dce), C(884aa164cf22363), C(6dcad433)}, - {C(7ca6e3933995dac), C(fd118c77daa8188), C(3aceb7b5e7da6545), C(3c07374d)}, - {C(f0d6044f6efd7598), C(e044d6ba4369856e), C(91968e4f8c8a1a4c), - C(f0f4602c)}, - {C(3d69e52049879d61), C(76610636ea9f74fe), C(e9bf5602f89310c0), - C(3e1ea071)}, - {C(79da242a16acae31), C(183c5f438e29d40), C(6d351710ae92f3de), C(67580f0c)}, - {C(461c82656a74fb57), C(d84b491b275aa0f7), C(8f262cb29a6eb8b2), - C(4e109454)}, - {C(53c1a66d0b13003), C(731f060e6fe797fc), C(daa56811791371e3), C(88a474a7)}, - {C(d3a2efec0f047e9), C(1cabce58853e58ea), C(7a17b2eae3256be4), C(5b5bedd)}, - {C(43c64d7484f7f9b2), C(5da002b64aafaeb7), C(b576c1e45800a716), - C(1aaddfa7)}, - {C(a7dec6ad81cf7fa1), C(180c1ab708683063), C(95e0fd7008d67cff), - C(5be07fd8)}, - {C(5408a1df99d4aff), C(b9565e588740f6bd), C(abf241813b08006e), C(cbca8606)}, - {C(a8b27a6bcaeeed4b), C(aec1eeded6a87e39), C(9daf246d6fed8326), - C(bde64d01)}, - {C(9a952a8246fdc269), C(d0dcfcac74ef278c), C(250f7139836f0f1f), - C(ee90cf33)}, - {C(c930841d1d88684f), C(5eb66eb18b7f9672), C(e455d413008a2546), - C(4305c3ce)}, - {C(94dc6971e3cf071a), C(994c7003b73b2b34), C(ea16e85978694e5), C(4b3a1d76)}, - {C(7fc98006e25cac9), C(77fee0484cda86a7), C(376ec3d447060456), C(a8bb6d80)}, - {C(bd781c4454103f6), C(612197322f49c931), C(b9cf17fd7e5462d5), C(1f9fa607)}, - {C(da60e6b14479f9df), C(3bdccf69ece16792), C(18ebf45c4fecfdc9), - C(8d0e4ed2)}, - {C(4ca56a348b6c4d3), C(60618537c3872514), C(2fbb9f0e65871b09), C(1bf31347)}, - {C(ebd22d4b70946401), C(6863602bf7139017), C(c0b1ac4e11b00666), - C(1ae3fc5b)}, - {C(3cc4693d6cbcb0c), C(501689ea1c70ffa), C(10a4353e9c89e364), C(459c3930)}, - {C(38908e43f7ba5ef0), C(1ab035d4e7781e76), C(41d133e8c0a68ff7), - C(e00c4184)}, - {C(34983ccc6aa40205), C(21802cad34e72bc4), C(1943e8fb3c17bb8), C(ffc7a781)}, - {C(86215c45dcac9905), C(ea546afe851cae4b), C(d85b6457e489e374), - C(6a125480)}, - {C(420fc255c38db175), C(d503cd0f3c1208d1), C(d4684e74c825a0bc), - C(88a1512b)}, - {C(1d7a31f5bc8fe2f9), C(4763991092dcf836), C(ed695f55b97416f4), - C(549bbbe5)}, - {C(94129a84c376a26e), C(c245e859dc231933), C(1b8f74fecf917453), - C(c133d38c)}, - {C(1d3a9809dab05c8d), C(adddeb4f71c93e8), C(ef342eb36631edb), C(fcace348)}, - {C(90fa3ccbd60848da), C(dfa6e0595b569e11), C(e585d067a1f5135d), - C(ed7b6f9a)}, - {C(2dbb4fc71b554514), C(9650e04b86be0f82), C(60f2304fba9274d3), - C(6d907dda)}, - {C(b98bf4274d18374a), C(1b669fd4c7f9a19a), C(b1f5972b88ba2b7a), - C(7a4d48d5)}, - {C(d6781d0b5e18eb68), C(b992913cae09b533), C(58f6021caaee3a40), - C(e686f3db)}, - {C(226651cf18f4884c), C(595052a874f0f51c), C(c9b75162b23bab42), C(cce7c55)}, - {C(a734fb047d3162d6), C(e523170d240ba3a5), C(125a6972809730e8), C(f58b96b)}, - {C(c6df6364a24f75a3), C(c294e2c84c4f5df8), C(a88df65c6a89313b), - C(1bbf6f60)}, - {C(d8d1364c1fbcd10), C(2d7cc7f54832deaa), C(4e22c876a7c57625), C(ce5e0cc2)}, - {C(aae06f9146db885f), C(3598736441e280d9), C(fba339b117083e55), - C(584cfd6f)}, - {C(8955ef07631e3bcc), C(7d70965ea3926f83), C(39aed4134f8b2db6), - C(8f9bbc33)}, - {C(ad611c609cfbe412), C(d3c00b18bf253877), C(90b2172e1f3d0bfd), - C(d7640d95)}, - {C(d5339adc295d5d69), C(b633cc1dcb8b586a), C(ee84184cf5b1aeaf), C(3d12a2b)}, - {C(40d0aeff521375a8), C(77ba1ad7ecebd506), C(547c6f1a7d9df427), - C(aaeafed0)}, - {C(8b2d54ae1a3df769), C(11e7adaee3216679), C(3483781efc563e03), - C(95b9b814)}, - {C(99c175819b4eae28), C(932e8ff9f7a40043), C(ec78dcab07ca9f7c), - C(45fbe66e)}, - {C(2a418335779b82fc), C(af0295987849a76b), C(c12bc5ff0213f46e), - C(b4baa7a8)}, - {C(3b1fc6a3d279e67d), C(70ea1e49c226396), C(25505adcf104697c), C(83e962fe)}, - {C(d97eacdf10f1c3c9), C(b54f4654043a36e0), C(b128f6eb09d1234), C(aac3531c)}, - {C(293a5c1c4e203cd4), C(6b3329f1c130cefe), C(f2e32f8ec76aac91), - C(2b1db7cc)}, - {C(4290e018ffaedde7), C(a14948545418eb5e), C(72d851b202284636), - C(cf00cd31)}, - {C(f919a59cbde8bf2f), C(a56d04203b2dc5a5), C(38b06753ac871e48), - C(7d3c43b8)}, - {C(1d70a3f5521d7fa4), C(fb97b3fdc5891965), C(299d49bbbe3535af), - C(cbd5fac6)}, - {C(6af98d7b656d0d7c), C(d2e99ae96d6b5c0c), C(f63bd1603ef80627), - C(76d0fec4)}, - {C(395b7a8adb96ab75), C(582df7165b20f4a), C(e52bd30e9ff657f9), C(405e3402)}, - {C(3822dd82c7df012f), C(b9029b40bd9f122b), C(fd25b988468266c4), - C(c732c481)}, - {C(79f7efe4a80b951a), C(dd3a3fddfc6c9c41), C(ab4c812f9e27aa40), - C(a8d123c9)}, - {C(ae6e59f5f055921a), C(e9d9b7bf68e82), C(5ce4e4a5b269cc59), C(1e80ad7d)}, - {C(8959dbbf07387d36), C(b4658afce48ea35d), C(8f3f82437d8cb8d6), - C(52aeb863)}, - {C(4739613234278a49), C(99ea5bcd340bf663), C(258640912e712b12), - C(ef7c0c18)}, - {C(420e6c926bc54841), C(96dbbf6f4e7c75cd), C(d8d40fa70c3c67bb), - C(b6ad4b68)}, - {C(c8601bab561bc1b7), C(72b26272a0ff869a), C(56fdfc986d6bc3c4), - C(c1e46b17)}, - {C(b2d294931a0e20eb), C(284ffd9a0815bc38), C(1f8a103aac9bbe6), C(57b8df25)}, - {C(7966f53c37b6c6d7), C(8e6abcfb3aa2b88f), C(7f2e5e0724e5f345), - C(e9fa36d6)}, - {C(be9bb0abd03b7368), C(13bca93a3031be55), C(e864f4f52b55b472), - C(8f8daefc)}, - {C(a08d128c5f1649be), C(a8166c3dbbe19aad), C(cb9f914f829ec62c), C(6e1bb7e)}, - {C(7c386f0ffe0465ac), C(530419c9d843dbf3), C(7450e3a4f72b8d8c), - C(fd0076f0)}, - {C(bb362094e7ef4f8), C(ff3c2a48966f9725), C(55152803acd4a7fe), C(899b17b6)}, - {C(cd80dea24321eea4), C(52b4fdc8130c2b15), C(f3ea100b154bfb82), - C(e3e84e31)}, - {C(d599a04125372c3a), C(313136c56a56f363), C(1e993c3677625832), - C(eef79b6b)}, - {C(dbbf541e9dfda0a), C(1479fceb6db4f844), C(31ab576b59062534), C(868e3315)}, - {C(c2ee3288be4fe2bf), C(c65d2f5ddf32b92), C(af6ecdf121ba5485), C(4639a426)}, - {C(d86603ced1ed4730), C(f9de718aaada7709), C(db8b9755194c6535), - C(f3213646)}, - {C(915263c671b28809), C(a815378e7ad762fd), C(abec6dc9b669f559), - C(17f148e9)}, - {C(2b67cdd38c307a5e), C(cb1d45bb5c9fe1c), C(800baf2a02ec18ad), C(bfd94880)}, - {C(2d107419073b9cd0), C(a96db0740cef8f54), C(ec41ee91b3ecdc1b), - C(bb1fa7f3)}, - {C(f3e9487ec0e26dfc), C(1ab1f63224e837fa), C(119983bb5a8125d8), C(88816b1)}, - {C(1160987c8fe86f7d), C(879e6db1481eb91b), C(d7dcb802bfe6885d), - C(5c2faeb3)}, - {C(eab8112c560b967b), C(97f550b58e89dbae), C(846ed506d304051f), - C(51b5fc6f)}, - {C(1addcf0386d35351), C(b5f436561f8f1484), C(85d38e22181c9bb1), - C(33d94752)}, - {C(d445ba84bf803e09), C(1216c2497038f804), C(2293216ea2237207), - C(b0c92948)}, - {C(37235a096a8be435), C(d9b73130493589c2), C(3b1024f59378d3be), - C(c7171590)}, - {C(763ad6ea2fe1c99d), C(cf7af5368ac1e26b), C(4d5e451b3bb8d3d4), - C(240a67fb)}, - {C(ea627fc84cd1b857), C(85e372494520071f), C(69ec61800845780b), - C(e1843cd5)}, - {C(1f2ffd79f2cdc0c8), C(726a1bc31b337aaa), C(678b7f275ef96434), - C(fda1452b)}, - {C(39a9e146ec4b3210), C(f63f75802a78b1ac), C(e2e22539c94741c3), - C(a2cad330)}, - {C(74cba303e2dd9d6d), C(692699b83289fad1), C(dfb9aa7874678480), - C(53467e16)}, - {C(4cbc2b73a43071e0), C(56c5db4c4ca4e0b7), C(1b275a162f46bd3d), - C(da14a8d0)}, - {C(875638b9715d2221), C(d9ba0615c0c58740), C(616d4be2dfe825aa), - C(67333551)}, - {C(fb686b2782994a8d), C(edee60693756bb48), C(e6bc3cae0ded2ef5), - C(a0ebd66e)}, - {C(ab21d81a911e6723), C(4c31b07354852f59), C(835da384c9384744), - C(4b769593)}, - {C(33d013cc0cd46ecf), C(3de726423aea122c), C(116af51117fe21a9), - C(6aa75624)}, - {C(8ca92c7cd39fae5d), C(317e620e1bf20f1), C(4f0b33bf2194b97f), C(602a3f96)}, - {C(fdde3b03f018f43e), C(38f932946c78660), C(c84084ce946851ee), C(cd183c4d)}, - {C(9c8502050e9c9458), C(d6d2a1a69964beb9), C(1675766f480229b5), - C(960a4d07)}, - {C(348176ca2fa2fdd2), C(3a89c514cc360c2d), C(9f90b8afb318d6d0), - C(9ae998c4)}, - {C(4a3d3dfbbaea130b), C(4e221c920f61ed01), C(553fd6cd1304531f), - C(74e2179d)}, - {C(b371f768cdf4edb9), C(bdef2ace6d2de0f0), C(e05b4100f7f1baec), - C(ee9bae25)}, - {C(7a1d2e96934f61f), C(eb1760ae6af7d961), C(887eb0da063005df), C(b66edf10)}, - {C(8be53d466d4728f2), C(86a5ac8e0d416640), C(984aa464cdb5c8bb), - C(d6209737)}, - {C(829677eb03abf042), C(43cad004b6bc2c0), C(f2f224756803971a), C(b994a88)}, - {C(754435bae3496fc), C(5707fc006f094dcf), C(8951c86ab19d8e40), C(a05d43c0)}, - {C(fda9877ea8e3805f), C(31e868b6ffd521b7), C(b08c90681fb6a0fd), - C(c79f73a8)}, - {C(2e36f523ca8f5eb5), C(8b22932f89b27513), C(331cd6ecbfadc1bb), - C(a490aff5)}, - {C(21a378ef76828208), C(a5c13037fa841da2), C(506d22a53fbe9812), - C(dfad65b4)}, - {C(ccdd5600054b16ca), C(f78846e84204cb7b), C(1f9faec82c24eac9), C(1d07dfb)}, - {C(7854468f4e0cabd0), C(3a3f6b4f098d0692), C(ae2423ec7799d30d), - C(416df9a0)}, - {C(7f88db5346d8f997), C(88eac9aacc653798), C(68a4d0295f8eefa1), - C(1f8fb9cc)}, - {C(bb3fb5fb01d60fcf), C(1b7cc0847a215eb6), C(1246c994437990a1), - C(7abf48e3)}, - {C(2e783e1761acd84d), C(39158042bac975a0), C(1cd21c5a8071188d), - C(dea4e3dd)}, - {C(392058251cf22acc), C(944ec4475ead4620), C(b330a10b5cb94166), - C(c6064f22)}, - {C(adf5c1e5d6419947), C(2a9747bc659d28aa), C(95c5b8cb1f5d62c), C(743bed9c)}, - {C(6bc1db2c2bee5aba), C(e63b0ed635307398), C(7b2eca111f30dbbc), - C(fce254d5)}, - {C(b00f898229efa508), C(83b7590ad7f6985c), C(2780e70a0592e41d), - C(e47ec9d1)}, - {C(b56eb769ce0d9a8c), C(ce196117bfbcaf04), C(b26c3c3797d66165), - C(334a145c)}, - {C(70c0637675b94150), C(259e1669305b0a15), C(46e1dd9fd387a58d), - C(adec1e3c)}, - {C(74c0b8a6821faafe), C(abac39d7491370e7), C(faf0b2a48a4e6aed), - C(f6a9fbf8)}, - {C(5fb5e48ac7b7fa4f), C(a96170f08f5acbc7), C(bbf5c63d4f52a1e5), - C(5398210c)}, -}; - -void TestUnchanging(const uint64_t* expected, int offset, int len) { - EXPECT_EQ(expected[0], CityHash64(data + offset, len)); - EXPECT_EQ(expected[3], CityHash32(data + offset, len)); - EXPECT_EQ(expected[1], CityHash64WithSeed(data + offset, len, kSeed0)); - EXPECT_EQ(expected[2], - CityHash64WithSeeds(data + offset, len, kSeed0, kSeed1)); -} - -TEST(CityHashTest, Unchanging) { - setup(); - int i = 0; - for (; i < kTestSize - 1; i++) { - TestUnchanging(testdata[i], i * i, i); - } - TestUnchanging(testdata[i], 0, kDataSize); -} - -} // namespace hash_internal -ABSL_NAMESPACE_END -} // namespace absl diff --git a/third_party/abseil_cpp/absl/hash/internal/hash.cc b/third_party/abseil_cpp/absl/hash/internal/hash.cc deleted file mode 100644 index b44ecb3a6b66..000000000000 --- a/third_party/abseil_cpp/absl/hash/internal/hash.cc +++ /dev/null @@ -1,55 +0,0 @@ -// 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/hash/internal/hash.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace hash_internal { - -uint64_t CityHashState::CombineLargeContiguousImpl32(uint64_t state, - const unsigned char* first, - size_t len) { - while (len >= PiecewiseChunkSize()) { - state = - Mix(state, absl::hash_internal::CityHash32(reinterpret_cast<const char*>(first), - PiecewiseChunkSize())); - len -= PiecewiseChunkSize(); - first += PiecewiseChunkSize(); - } - // Handle the remainder. - return CombineContiguousImpl(state, first, len, - std::integral_constant<int, 4>{}); -} - -uint64_t CityHashState::CombineLargeContiguousImpl64(uint64_t state, - const unsigned char* first, - size_t len) { - while (len >= PiecewiseChunkSize()) { - state = - Mix(state, absl::hash_internal::CityHash64(reinterpret_cast<const char*>(first), - PiecewiseChunkSize())); - len -= PiecewiseChunkSize(); - first += PiecewiseChunkSize(); - } - // Handle the remainder. - return CombineContiguousImpl(state, first, len, - std::integral_constant<int, 8>{}); -} - -ABSL_CONST_INIT const void* const CityHashState::kSeed = &kSeed; - -} // namespace hash_internal -ABSL_NAMESPACE_END -} // namespace absl diff --git a/third_party/abseil_cpp/absl/hash/internal/hash.h b/third_party/abseil_cpp/absl/hash/internal/hash.h deleted file mode 100644 index b0132da2069d..000000000000 --- a/third_party/abseil_cpp/absl/hash/internal/hash.h +++ /dev/null @@ -1,1003 +0,0 @@ -// 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. -// -// ----------------------------------------------------------------------------- -// File: hash.h -// ----------------------------------------------------------------------------- -// -#ifndef ABSL_HASH_INTERNAL_HASH_H_ -#define ABSL_HASH_INTERNAL_HASH_H_ - -#include <algorithm> -#include <array> -#include <cmath> -#include <cstring> -#include <deque> -#include <forward_list> -#include <functional> -#include <iterator> -#include <limits> -#include <list> -#include <map> -#include <memory> -#include <set> -#include <string> -#include <tuple> -#include <type_traits> -#include <utility> -#include <vector> - -#include "absl/base/internal/endian.h" -#include "absl/base/port.h" -#include "absl/container/fixed_array.h" -#include "absl/meta/type_traits.h" -#include "absl/numeric/int128.h" -#include "absl/strings/string_view.h" -#include "absl/types/optional.h" -#include "absl/types/variant.h" -#include "absl/utility/utility.h" -#include "absl/hash/internal/city.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace hash_internal { - -// Internal detail: Large buffers are hashed in smaller chunks. This function -// returns the size of these chunks. -constexpr size_t PiecewiseChunkSize() { return 1024; } - -// PiecewiseCombiner -// -// PiecewiseCombiner is an internal-only helper class for hashing a piecewise -// buffer of `char` or `unsigned char` as though it were contiguous. This class -// provides two methods: -// -// H add_buffer(state, data, size) -// H finalize(state) -// -// `add_buffer` can be called zero or more times, followed by a single call to -// `finalize`. This will produce the same hash expansion as concatenating each -// buffer piece into a single contiguous buffer, and passing this to -// `H::combine_contiguous`. -// -// Example usage: -// PiecewiseCombiner combiner; -// for (const auto& piece : pieces) { -// state = combiner.add_buffer(std::move(state), piece.data, piece.size); -// } -// return combiner.finalize(std::move(state)); -class PiecewiseCombiner { - public: - PiecewiseCombiner() : position_(0) {} - PiecewiseCombiner(const PiecewiseCombiner&) = delete; - PiecewiseCombiner& operator=(const PiecewiseCombiner&) = delete; - - // PiecewiseCombiner::add_buffer() - // - // Appends the given range of bytes to the sequence to be hashed, which may - // modify the provided hash state. - template <typename H> - H add_buffer(H state, const unsigned char* data, size_t size); - template <typename H> - H add_buffer(H state, const char* data, size_t size) { - return add_buffer(std::move(state), - reinterpret_cast<const unsigned char*>(data), size); - } - - // PiecewiseCombiner::finalize() - // - // Finishes combining the hash sequence, which may may modify the provided - // hash state. - // - // Once finalize() is called, add_buffer() may no longer be called. The - // resulting hash state will be the same as if the pieces passed to - // add_buffer() were concatenated into a single flat buffer, and then provided - // to H::combine_contiguous(). - template <typename H> - H finalize(H state); - - private: - unsigned char buf_[PiecewiseChunkSize()]; - size_t position_; -}; - -// HashStateBase -// -// A hash state object represents an intermediate state in the computation -// of an unspecified hash algorithm. `HashStateBase` provides a CRTP style -// base class for hash state implementations. Developers adding type support -// for `absl::Hash` should not rely on any parts of the state object other than -// the following member functions: -// -// * HashStateBase::combine() -// * HashStateBase::combine_contiguous() -// -// A derived hash state class of type `H` must provide a static member function -// with a signature similar to the following: -// -// `static H combine_contiguous(H state, const unsigned char*, size_t)`. -// -// `HashStateBase` will provide a complete implementation for a hash state -// object in terms of this method. -// -// Example: -// -// // Use CRTP to define your derived class. -// struct MyHashState : HashStateBase<MyHashState> { -// static H combine_contiguous(H state, const unsigned char*, size_t); -// using MyHashState::HashStateBase::combine; -// using MyHashState::HashStateBase::combine_contiguous; -// }; -template <typename H> -class HashStateBase { - public: - // HashStateBase::combine() - // - // Combines an arbitrary number of values into a hash state, returning the - // updated state. - // - // Each of the value types `T` must be separately hashable by the Abseil - // hashing framework. - // - // NOTE: - // - // state = H::combine(std::move(state), value1, value2, value3); - // - // is guaranteed to produce the same hash expansion as: - // - // state = H::combine(std::move(state), value1); - // state = H::combine(std::move(state), value2); - // state = H::combine(std::move(state), value3); - template <typename T, typename... Ts> - static H combine(H state, const T& value, const Ts&... values); - static H combine(H state) { return state; } - - // HashStateBase::combine_contiguous() - // - // Combines a contiguous array of `size` elements into a hash state, returning - // the updated state. - // - // NOTE: - // - // state = H::combine_contiguous(std::move(state), data, size); - // - // is NOT guaranteed to produce the same hash expansion as a for-loop (it may - // perform internal optimizations). If you need this guarantee, use the - // for-loop instead. - template <typename T> - static H combine_contiguous(H state, const T* data, size_t size); - - using AbslInternalPiecewiseCombiner = PiecewiseCombiner; -}; - -// is_uniquely_represented -// -// `is_uniquely_represented<T>` is a trait class that indicates whether `T` -// is uniquely represented. -// -// A type is "uniquely represented" if two equal values of that type are -// guaranteed to have the same bytes in their underlying storage. In other -// words, if `a == b`, then `memcmp(&a, &b, sizeof(T))` is guaranteed to be -// zero. This property cannot be detected automatically, so this trait is false -// by default, but can be specialized by types that wish to assert that they are -// uniquely represented. This makes them eligible for certain optimizations. -// -// If you have any doubt whatsoever, do not specialize this template. -// The default is completely safe, and merely disables some optimizations -// that will not matter for most types. Specializing this template, -// on the other hand, can be very hazardous. -// -// To be uniquely represented, a type must not have multiple ways of -// representing the same value; for example, float and double are not -// uniquely represented, because they have distinct representations for -// +0 and -0. Furthermore, the type's byte representation must consist -// solely of user-controlled data, with no padding bits and no compiler- -// controlled data such as vptrs or sanitizer metadata. This is usually -// very difficult to guarantee, because in most cases the compiler can -// insert data and padding bits at its own discretion. -// -// If you specialize this template for a type `T`, you must do so in the file -// that defines that type (or in this file). If you define that specialization -// anywhere else, `is_uniquely_represented<T>` could have different meanings -// in different places. -// -// The Enable parameter is meaningless; it is provided as a convenience, -// to support certain SFINAE techniques when defining specializations. -template <typename T, typename Enable = void> -struct is_uniquely_represented : std::false_type {}; - -// is_uniquely_represented<unsigned char> -// -// unsigned char is a synonym for "byte", so it is guaranteed to be -// uniquely represented. -template <> -struct is_uniquely_represented<unsigned char> : std::true_type {}; - -// is_uniquely_represented for non-standard integral types -// -// Integral types other than bool should be uniquely represented on any -// platform that this will plausibly be ported to. -template <typename Integral> -struct is_uniquely_represented< - Integral, typename std::enable_if<std::is_integral<Integral>::value>::type> - : std::true_type {}; - -// is_uniquely_represented<bool> -// -// -template <> -struct is_uniquely_represented<bool> : std::false_type {}; - -// hash_bytes() -// -// Convenience function that combines `hash_state` with the byte representation -// of `value`. -template <typename H, typename T> -H hash_bytes(H hash_state, const T& value) { - const unsigned char* start = reinterpret_cast<const unsigned char*>(&value); - return H::combine_contiguous(std::move(hash_state), start, sizeof(value)); -} - -// ----------------------------------------------------------------------------- -// AbslHashValue for Basic Types -// ----------------------------------------------------------------------------- - -// Note: Default `AbslHashValue` implementations live in `hash_internal`. This -// allows us to block lexical scope lookup when doing an unqualified call to -// `AbslHashValue` below. User-defined implementations of `AbslHashValue` can -// only be found via ADL. - -// AbslHashValue() for hashing bool values -// -// We use SFINAE to ensure that this overload only accepts bool, not types that -// are convertible to bool. -template <typename H, typename B> -typename std::enable_if<std::is_same<B, bool>::value, H>::type AbslHashValue( - H hash_state, B value) { - return H::combine(std::move(hash_state), - static_cast<unsigned char>(value ? 1 : 0)); -} - -// AbslHashValue() for hashing enum values -template <typename H, typename Enum> -typename std::enable_if<std::is_enum<Enum>::value, H>::type AbslHashValue( - H hash_state, Enum e) { - // In practice, we could almost certainly just invoke hash_bytes directly, - // but it's possible that a sanitizer might one day want to - // store data in the unused bits of an enum. To avoid that risk, we - // convert to the underlying type before hashing. Hopefully this will get - // optimized away; if not, we can reopen discussion with c-toolchain-team. - return H::combine(std::move(hash_state), - static_cast<typename std::underlying_type<Enum>::type>(e)); -} -// AbslHashValue() for hashing floating-point values -template <typename H, typename Float> -typename std::enable_if<std::is_same<Float, float>::value || - std::is_same<Float, double>::value, - H>::type -AbslHashValue(H hash_state, Float value) { - return hash_internal::hash_bytes(std::move(hash_state), - value == 0 ? 0 : value); -} - -// Long double has the property that it might have extra unused bytes in it. -// For example, in x86 sizeof(long double)==16 but it only really uses 80-bits -// of it. This means we can't use hash_bytes on a long double and have to -// convert it to something else first. -template <typename H, typename LongDouble> -typename std::enable_if<std::is_same<LongDouble, long double>::value, H>::type -AbslHashValue(H hash_state, LongDouble value) { - const int category = std::fpclassify(value); - switch (category) { - case FP_INFINITE: - // Add the sign bit to differentiate between +Inf and -Inf - hash_state = H::combine(std::move(hash_state), std::signbit(value)); - break; - - case FP_NAN: - case FP_ZERO: - default: - // Category is enough for these. - break; - - case FP_NORMAL: - case FP_SUBNORMAL: - // We can't convert `value` directly to double because this would have - // undefined behavior if the value is out of range. - // std::frexp gives us a value in the range (-1, -.5] or [.5, 1) that is - // guaranteed to be in range for `double`. The truncation is - // implementation defined, but that works as long as it is deterministic. - int exp; - auto mantissa = static_cast<double>(std::frexp(value, &exp)); - hash_state = H::combine(std::move(hash_state), mantissa, exp); - } - - return H::combine(std::move(hash_state), category); -} - -// AbslHashValue() for hashing pointers -template <typename H, typename T> -H AbslHashValue(H hash_state, T* ptr) { - auto v = reinterpret_cast<uintptr_t>(ptr); - // Due to alignment, pointers tend to have low bits as zero, and the next few - // bits follow a pattern since they are also multiples of some base value. - // Mixing the pointer twice helps prevent stuck low bits for certain alignment - // values. - return H::combine(std::move(hash_state), v, v); -} - -// AbslHashValue() for hashing nullptr_t -template <typename H> -H AbslHashValue(H hash_state, std::nullptr_t) { - return H::combine(std::move(hash_state), static_cast<void*>(nullptr)); -} - -// ----------------------------------------------------------------------------- -// AbslHashValue for Composite Types -// ----------------------------------------------------------------------------- - -// is_hashable() -// -// Trait class which returns true if T is hashable by the absl::Hash framework. -// Used for the AbslHashValue implementations for composite types below. -template <typename T> -struct is_hashable; - -// AbslHashValue() for hashing pairs -template <typename H, typename T1, typename T2> -typename std::enable_if<is_hashable<T1>::value && is_hashable<T2>::value, - H>::type -AbslHashValue(H hash_state, const std::pair<T1, T2>& p) { - return H::combine(std::move(hash_state), p.first, p.second); -} - -// hash_tuple() -// -// Helper function for hashing a tuple. The third argument should -// be an index_sequence running from 0 to tuple_size<Tuple> - 1. -template <typename H, typename Tuple, size_t... Is> -H hash_tuple(H hash_state, const Tuple& t, absl::index_sequence<Is...>) { - return H::combine(std::move(hash_state), std::get<Is>(t)...); -} - -// AbslHashValue for hashing tuples -template <typename H, typename... Ts> -#if defined(_MSC_VER) -// This SFINAE gets MSVC confused under some conditions. Let's just disable it -// for now. -H -#else // _MSC_VER -typename std::enable_if<absl::conjunction<is_hashable<Ts>...>::value, H>::type -#endif // _MSC_VER -AbslHashValue(H hash_state, const std::tuple<Ts...>& t) { - return hash_internal::hash_tuple(std::move(hash_state), t, - absl::make_index_sequence<sizeof...(Ts)>()); -} - -// ----------------------------------------------------------------------------- -// AbslHashValue for Pointers -// ----------------------------------------------------------------------------- - -// AbslHashValue for hashing unique_ptr -template <typename H, typename T, typename D> -H AbslHashValue(H hash_state, const std::unique_ptr<T, D>& ptr) { - return H::combine(std::move(hash_state), ptr.get()); -} - -// AbslHashValue for hashing shared_ptr -template <typename H, typename T> -H AbslHashValue(H hash_state, const std::shared_ptr<T>& ptr) { - return H::combine(std::move(hash_state), ptr.get()); -} - -// ----------------------------------------------------------------------------- -// AbslHashValue for String-Like Types -// ----------------------------------------------------------------------------- - -// AbslHashValue for hashing strings -// -// All the string-like types supported here provide the same hash expansion for -// the same character sequence. These types are: -// -// - `absl::Cord` -// - `std::string` (and std::basic_string<char, std::char_traits<char>, A> for -// any allocator A) -// - `absl::string_view` and `std::string_view` -// -// For simplicity, we currently support only `char` strings. This support may -// be broadened, if necessary, but with some caution - this overload would -// misbehave in cases where the traits' `eq()` member isn't equivalent to `==` -// on the underlying character type. -template <typename H> -H AbslHashValue(H hash_state, absl::string_view str) { - return H::combine( - H::combine_contiguous(std::move(hash_state), str.data(), str.size()), - str.size()); -} - -// Support std::wstring, std::u16string and std::u32string. -template <typename Char, typename Alloc, typename H, - typename = absl::enable_if_t<std::is_same<Char, wchar_t>::value || - std::is_same<Char, char16_t>::value || - std::is_same<Char, char32_t>::value>> -H AbslHashValue( - H hash_state, - const std::basic_string<Char, std::char_traits<Char>, Alloc>& str) { - return H::combine( - H::combine_contiguous(std::move(hash_state), str.data(), str.size()), - str.size()); -} - -// ----------------------------------------------------------------------------- -// AbslHashValue for Sequence Containers -// ----------------------------------------------------------------------------- - -// AbslHashValue for hashing std::array -template <typename H, typename T, size_t N> -typename std::enable_if<is_hashable<T>::value, H>::type AbslHashValue( - H hash_state, const std::array<T, N>& array) { - return H::combine_contiguous(std::move(hash_state), array.data(), - array.size()); -} - -// AbslHashValue for hashing std::deque -template <typename H, typename T, typename Allocator> -typename std::enable_if<is_hashable<T>::value, H>::type AbslHashValue( - H hash_state, const std::deque<T, Allocator>& deque) { - // TODO(gromer): investigate a more efficient implementation taking - // advantage of the chunk structure. - for (const auto& t : deque) { - hash_state = H::combine(std::move(hash_state), t); - } - return H::combine(std::move(hash_state), deque.size()); -} - -// AbslHashValue for hashing std::forward_list -template <typename H, typename T, typename Allocator> -typename std::enable_if<is_hashable<T>::value, H>::type AbslHashValue( - H hash_state, const std::forward_list<T, Allocator>& list) { - size_t size = 0; - for (const T& t : list) { - hash_state = H::combine(std::move(hash_state), t); - ++size; - } - return H::combine(std::move(hash_state), size); -} - -// AbslHashValue for hashing std::list -template <typename H, typename T, typename Allocator> -typename std::enable_if<is_hashable<T>::value, H>::type AbslHashValue( - H hash_state, const std::list<T, Allocator>& list) { - for (const auto& t : list) { - hash_state = H::combine(std::move(hash_state), t); - } - return H::combine(std::move(hash_state), list.size()); -} - -// AbslHashValue for hashing std::vector -// -// Do not use this for vector<bool>. It does not have a .data(), and a fallback -// for std::hash<> is most likely faster. -template <typename H, typename T, typename Allocator> -typename std::enable_if<is_hashable<T>::value && !std::is_same<T, bool>::value, - H>::type -AbslHashValue(H hash_state, const std::vector<T, Allocator>& vector) { - return H::combine(H::combine_contiguous(std::move(hash_state), vector.data(), - vector.size()), - vector.size()); -} - -// ----------------------------------------------------------------------------- -// AbslHashValue for Ordered Associative Containers -// ----------------------------------------------------------------------------- - -// AbslHashValue for hashing std::map -template <typename H, typename Key, typename T, typename Compare, - typename Allocator> -typename std::enable_if<is_hashable<Key>::value && is_hashable<T>::value, - H>::type -AbslHashValue(H hash_state, const std::map<Key, T, Compare, Allocator>& map) { - for (const auto& t : map) { - hash_state = H::combine(std::move(hash_state), t); - } - return H::combine(std::move(hash_state), map.size()); -} - -// AbslHashValue for hashing std::multimap -template <typename H, typename Key, typename T, typename Compare, - typename Allocator> -typename std::enable_if<is_hashable<Key>::value && is_hashable<T>::value, - H>::type -AbslHashValue(H hash_state, - const std::multimap<Key, T, Compare, Allocator>& map) { - for (const auto& t : map) { - hash_state = H::combine(std::move(hash_state), t); - } - return H::combine(std::move(hash_state), map.size()); -} - -// AbslHashValue for hashing std::set -template <typename H, typename Key, typename Compare, typename Allocator> -typename std::enable_if<is_hashable<Key>::value, H>::type AbslHashValue( - H hash_state, const std::set<Key, Compare, Allocator>& set) { - for (const auto& t : set) { - hash_state = H::combine(std::move(hash_state), t); - } - return H::combine(std::move(hash_state), set.size()); -} - -// AbslHashValue for hashing std::multiset -template <typename H, typename Key, typename Compare, typename Allocator> -typename std::enable_if<is_hashable<Key>::value, H>::type AbslHashValue( - H hash_state, const std::multiset<Key, Compare, Allocator>& set) { - for (const auto& t : set) { - hash_state = H::combine(std::move(hash_state), t); - } - return H::combine(std::move(hash_state), set.size()); -} - -// ----------------------------------------------------------------------------- -// AbslHashValue for Wrapper Types -// ----------------------------------------------------------------------------- - -// AbslHashValue for hashing std::reference_wrapper -template <typename H, typename T> -typename std::enable_if<is_hashable<T>::value, H>::type AbslHashValue( - H hash_state, std::reference_wrapper<T> opt) { - return H::combine(std::move(hash_state), opt.get()); -} - -// AbslHashValue for hashing absl::optional -template <typename H, typename T> -typename std::enable_if<is_hashable<T>::value, H>::type AbslHashValue( - H hash_state, const absl::optional<T>& opt) { - if (opt) hash_state = H::combine(std::move(hash_state), *opt); - return H::combine(std::move(hash_state), opt.has_value()); -} - -// VariantVisitor -template <typename H> -struct VariantVisitor { - H&& hash_state; - template <typename T> - H operator()(const T& t) const { - return H::combine(std::move(hash_state), t); - } -}; - -// AbslHashValue for hashing absl::variant -template <typename H, typename... T> -typename std::enable_if<conjunction<is_hashable<T>...>::value, H>::type -AbslHashValue(H hash_state, const absl::variant<T...>& v) { - if (!v.valueless_by_exception()) { - hash_state = absl::visit(VariantVisitor<H>{std::move(hash_state)}, v); - } - return H::combine(std::move(hash_state), v.index()); -} - -// ----------------------------------------------------------------------------- -// AbslHashValue for Other Types -// ----------------------------------------------------------------------------- - -// AbslHashValue for hashing std::bitset is not defined, for the same reason as -// for vector<bool> (see std::vector above): It does not expose the raw bytes, -// and a fallback to std::hash<> is most likely faster. - -// ----------------------------------------------------------------------------- - -// hash_range_or_bytes() -// -// Mixes all values in the range [data, data+size) into the hash state. -// This overload accepts only uniquely-represented types, and hashes them by -// hashing the entire range of bytes. -template <typename H, typename T> -typename std::enable_if<is_uniquely_represented<T>::value, H>::type -hash_range_or_bytes(H hash_state, const T* data, size_t size) { - const auto* bytes = reinterpret_cast<const unsigned char*>(data); - return H::combine_contiguous(std::move(hash_state), bytes, sizeof(T) * size); -} - -// hash_range_or_bytes() -template <typename H, typename T> -typename std::enable_if<!is_uniquely_represented<T>::value, H>::type -hash_range_or_bytes(H hash_state, const T* data, size_t size) { - for (const auto end = data + size; data < end; ++data) { - hash_state = H::combine(std::move(hash_state), *data); - } - return hash_state; -} - -#if defined(ABSL_INTERNAL_LEGACY_HASH_NAMESPACE) && \ - ABSL_META_INTERNAL_STD_HASH_SFINAE_FRIENDLY_ -#define ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_ 1 -#else -#define ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_ 0 -#endif - -// HashSelect -// -// Type trait to select the appropriate hash implementation to use. -// HashSelect::type<T> will give the proper hash implementation, to be invoked -// as: -// HashSelect::type<T>::Invoke(state, value) -// Also, HashSelect::type<T>::value is a boolean equal to `true` if there is a -// valid `Invoke` function. Types that are not hashable will have a ::value of -// `false`. -struct HashSelect { - private: - struct State : HashStateBase<State> { - static State combine_contiguous(State hash_state, const unsigned char*, - size_t); - using State::HashStateBase::combine_contiguous; - }; - - struct UniquelyRepresentedProbe { - template <typename H, typename T> - static auto Invoke(H state, const T& value) - -> absl::enable_if_t<is_uniquely_represented<T>::value, H> { - return hash_internal::hash_bytes(std::move(state), value); - } - }; - - struct HashValueProbe { - template <typename H, typename T> - static auto Invoke(H state, const T& value) -> absl::enable_if_t< - std::is_same<H, - decltype(AbslHashValue(std::move(state), value))>::value, - H> { - return AbslHashValue(std::move(state), value); - } - }; - - struct LegacyHashProbe { -#if ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_ - template <typename H, typename T> - static auto Invoke(H state, const T& value) -> absl::enable_if_t< - std::is_convertible< - decltype(ABSL_INTERNAL_LEGACY_HASH_NAMESPACE::hash<T>()(value)), - size_t>::value, - H> { - return hash_internal::hash_bytes( - std::move(state), - ABSL_INTERNAL_LEGACY_HASH_NAMESPACE::hash<T>{}(value)); - } -#endif // ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_ - }; - - struct StdHashProbe { - template <typename H, typename T> - static auto Invoke(H state, const T& value) - -> absl::enable_if_t<type_traits_internal::IsHashable<T>::value, H> { - return hash_internal::hash_bytes(std::move(state), std::hash<T>{}(value)); - } - }; - - template <typename Hash, typename T> - struct Probe : Hash { - private: - template <typename H, typename = decltype(H::Invoke( - std::declval<State>(), std::declval<const T&>()))> - static std::true_type Test(int); - template <typename U> - static std::false_type Test(char); - - public: - static constexpr bool value = decltype(Test<Hash>(0))::value; - }; - - public: - // Probe each implementation in order. - // disjunction provides short circuiting wrt instantiation. - template <typename T> - using Apply = absl::disjunction< // - Probe<UniquelyRepresentedProbe, T>, // - Probe<HashValueProbe, T>, // - Probe<LegacyHashProbe, T>, // - Probe<StdHashProbe, T>, // - std::false_type>; -}; - -template <typename T> -struct is_hashable - : std::integral_constant<bool, HashSelect::template Apply<T>::value> {}; - -// CityHashState -class ABSL_DLL CityHashState - : public HashStateBase<CityHashState> { - // absl::uint128 is not an alias or a thin wrapper around the intrinsic. - // We use the intrinsic when available to improve performance. -#ifdef ABSL_HAVE_INTRINSIC_INT128 - using uint128 = __uint128_t; -#else // ABSL_HAVE_INTRINSIC_INT128 - using uint128 = absl::uint128; -#endif // ABSL_HAVE_INTRINSIC_INT128 - - static constexpr uint64_t kMul = - sizeof(size_t) == 4 ? uint64_t{0xcc9e2d51} - : uint64_t{0x9ddfea08eb382d69}; - - template <typename T> - using IntegralFastPath = - conjunction<std::is_integral<T>, is_uniquely_represented<T>>; - - public: - // Move only - CityHashState(CityHashState&&) = default; - CityHashState& operator=(CityHashState&&) = default; - - // CityHashState::combine_contiguous() - // - // Fundamental base case for hash recursion: mixes the given range of bytes - // into the hash state. - static CityHashState combine_contiguous(CityHashState hash_state, - const unsigned char* first, - size_t size) { - return CityHashState( - CombineContiguousImpl(hash_state.state_, first, size, - std::integral_constant<int, sizeof(size_t)>{})); - } - using CityHashState::HashStateBase::combine_contiguous; - - // CityHashState::hash() - // - // For performance reasons in non-opt mode, we specialize this for - // integral types. - // Otherwise we would be instantiating and calling dozens of functions for - // something that is just one multiplication and a couple xor's. - // The result should be the same as running the whole algorithm, but faster. - template <typename T, absl::enable_if_t<IntegralFastPath<T>::value, int> = 0> - static size_t hash(T value) { - return static_cast<size_t>(Mix(Seed(), static_cast<uint64_t>(value))); - } - - // Overload of CityHashState::hash() - template <typename T, absl::enable_if_t<!IntegralFastPath<T>::value, int> = 0> - static size_t hash(const T& value) { - return static_cast<size_t>(combine(CityHashState{}, value).state_); - } - - private: - // Invoked only once for a given argument; that plus the fact that this is - // move-only ensures that there is only one non-moved-from object. - CityHashState() : state_(Seed()) {} - - // Workaround for MSVC bug. - // We make the type copyable to fix the calling convention, even though we - // never actually copy it. Keep it private to not affect the public API of the - // type. - CityHashState(const CityHashState&) = default; - - explicit CityHashState(uint64_t state) : state_(state) {} - - // Implementation of the base case for combine_contiguous where we actually - // mix the bytes into the state. - // Dispatch to different implementations of the combine_contiguous depending - // on the value of `sizeof(size_t)`. - static uint64_t CombineContiguousImpl(uint64_t state, - const unsigned char* first, size_t len, - std::integral_constant<int, 4> - /* sizeof_size_t */); - static uint64_t CombineContiguousImpl(uint64_t state, - const unsigned char* first, size_t len, - std::integral_constant<int, 8> - /* sizeof_size_t*/); - - // Slow dispatch path for calls to CombineContiguousImpl with a size argument - // larger than PiecewiseChunkSize(). Has the same effect as calling - // CombineContiguousImpl() repeatedly with the chunk stride size. - static uint64_t CombineLargeContiguousImpl32(uint64_t state, - const unsigned char* first, - size_t len); - static uint64_t CombineLargeContiguousImpl64(uint64_t state, - const unsigned char* first, - size_t len); - - // Reads 9 to 16 bytes from p. - // The first 8 bytes are in .first, the rest (zero padded) bytes are in - // .second. - static std::pair<uint64_t, uint64_t> Read9To16(const unsigned char* p, - size_t len) { - uint64_t high = little_endian::Load64(p + len - 8); - return {little_endian::Load64(p), high >> (128 - len * 8)}; - } - - // Reads 4 to 8 bytes from p. Zero pads to fill uint64_t. - static uint64_t Read4To8(const unsigned char* p, size_t len) { - return (static_cast<uint64_t>(little_endian::Load32(p + len - 4)) - << (len - 4) * 8) | - little_endian::Load32(p); - } - - // Reads 1 to 3 bytes from p. Zero pads to fill uint32_t. - static uint32_t Read1To3(const unsigned char* p, size_t len) { - return static_cast<uint32_t>((p[0]) | // - (p[len / 2] << (len / 2 * 8)) | // - (p[len - 1] << ((len - 1) * 8))); - } - - ABSL_ATTRIBUTE_ALWAYS_INLINE static uint64_t Mix(uint64_t state, uint64_t v) { - using MultType = - absl::conditional_t<sizeof(size_t) == 4, uint64_t, uint128>; - // We do the addition in 64-bit space to make sure the 128-bit - // multiplication is fast. If we were to do it as MultType the compiler has - // to assume that the high word is non-zero and needs to perform 2 - // multiplications instead of one. - MultType m = state + v; - m *= kMul; - return static_cast<uint64_t>(m ^ (m >> (sizeof(m) * 8 / 2))); - } - - // Seed() - // - // A non-deterministic seed. - // - // The current purpose of this seed is to generate non-deterministic results - // and prevent having users depend on the particular hash values. - // It is not meant as a security feature right now, but it leaves the door - // open to upgrade it to a true per-process random seed. A true random seed - // costs more and we don't need to pay for that right now. - // - // On platforms with ASLR, we take advantage of it to make a per-process - // random value. - // See https://en.wikipedia.org/wiki/Address_space_layout_randomization - // - // On other platforms this is still going to be non-deterministic but most - // probably per-build and not per-process. - ABSL_ATTRIBUTE_ALWAYS_INLINE static uint64_t Seed() { -#if (!defined(__clang__) || __clang_major__ > 11) && \ - !defined(__apple_build_version__) - return static_cast<uint64_t>(reinterpret_cast<uintptr_t>(&kSeed)); -#else - // Workaround the absence of - // https://github.com/llvm/llvm-project/commit/bc15bf66dcca76cc06fe71fca35b74dc4d521021. - return static_cast<uint64_t>(reinterpret_cast<uintptr_t>(kSeed)); -#endif - } - static const void* const kSeed; - - uint64_t state_; -}; - -// CityHashState::CombineContiguousImpl() -inline uint64_t CityHashState::CombineContiguousImpl( - uint64_t state, const unsigned char* first, size_t len, - std::integral_constant<int, 4> /* sizeof_size_t */) { - // For large values we use CityHash, for small ones we just use a - // multiplicative hash. - uint64_t v; - if (len > 8) { - if (ABSL_PREDICT_FALSE(len > PiecewiseChunkSize())) { - return CombineLargeContiguousImpl32(state, first, len); - } - v = absl::hash_internal::CityHash32(reinterpret_cast<const char*>(first), len); - } else if (len >= 4) { - v = Read4To8(first, len); - } else if (len > 0) { - v = Read1To3(first, len); - } else { - // Empty ranges have no effect. - return state; - } - return Mix(state, v); -} - -// Overload of CityHashState::CombineContiguousImpl() -inline uint64_t CityHashState::CombineContiguousImpl( - uint64_t state, const unsigned char* first, size_t len, - std::integral_constant<int, 8> /* sizeof_size_t */) { - // For large values we use CityHash, for small ones we just use a - // multiplicative hash. - uint64_t v; - if (len > 16) { - if (ABSL_PREDICT_FALSE(len > PiecewiseChunkSize())) { - return CombineLargeContiguousImpl64(state, first, len); - } - v = absl::hash_internal::CityHash64(reinterpret_cast<const char*>(first), len); - } else if (len > 8) { - auto p = Read9To16(first, len); - state = Mix(state, p.first); - v = p.second; - } else if (len >= 4) { - v = Read4To8(first, len); - } else if (len > 0) { - v = Read1To3(first, len); - } else { - // Empty ranges have no effect. - return state; - } - return Mix(state, v); -} - -struct AggregateBarrier {}; - -// HashImpl - -// Add a private base class to make sure this type is not an aggregate. -// Aggregates can be aggregate initialized even if the default constructor is -// deleted. -struct PoisonedHash : private AggregateBarrier { - PoisonedHash() = delete; - PoisonedHash(const PoisonedHash&) = delete; - PoisonedHash& operator=(const PoisonedHash&) = delete; -}; - -template <typename T> -struct HashImpl { - size_t operator()(const T& value) const { return CityHashState::hash(value); } -}; - -template <typename T> -struct Hash - : absl::conditional_t<is_hashable<T>::value, HashImpl<T>, PoisonedHash> {}; - -template <typename H> -template <typename T, typename... Ts> -H HashStateBase<H>::combine(H state, const T& value, const Ts&... values) { - return H::combine(hash_internal::HashSelect::template Apply<T>::Invoke( - std::move(state), value), - values...); -} - -// HashStateBase::combine_contiguous() -template <typename H> -template <typename T> -H HashStateBase<H>::combine_contiguous(H state, const T* data, size_t size) { - return hash_internal::hash_range_or_bytes(std::move(state), data, size); -} - -// HashStateBase::PiecewiseCombiner::add_buffer() -template <typename H> -H PiecewiseCombiner::add_buffer(H state, const unsigned char* data, - size_t size) { - if (position_ + size < PiecewiseChunkSize()) { - // This partial chunk does not fill our existing buffer - memcpy(buf_ + position_, data, size); - position_ += size; - return state; - } - - // If the buffer is partially filled we need to complete the buffer - // and hash it. - if (position_ != 0) { - const size_t bytes_needed = PiecewiseChunkSize() - position_; - memcpy(buf_ + position_, data, bytes_needed); - state = H::combine_contiguous(std::move(state), buf_, PiecewiseChunkSize()); - data += bytes_needed; - size -= bytes_needed; - } - - // Hash whatever chunks we can without copying - while (size >= PiecewiseChunkSize()) { - state = H::combine_contiguous(std::move(state), data, PiecewiseChunkSize()); - data += PiecewiseChunkSize(); - size -= PiecewiseChunkSize(); - } - // Fill the buffer with the remainder - memcpy(buf_, data, size); - position_ = size; - return state; -} - -// HashStateBase::PiecewiseCombiner::finalize() -template <typename H> -H PiecewiseCombiner::finalize(H state) { - // Hash the remainder left in the buffer, which may be empty - return H::combine_contiguous(std::move(state), buf_, position_); -} - -} // namespace hash_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_HASH_INTERNAL_HASH_H_ diff --git a/third_party/abseil_cpp/absl/hash/internal/print_hash_of.cc b/third_party/abseil_cpp/absl/hash/internal/print_hash_of.cc deleted file mode 100644 index c392125a69fa..000000000000 --- a/third_party/abseil_cpp/absl/hash/internal/print_hash_of.cc +++ /dev/null @@ -1,23 +0,0 @@ -// 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 <cstdlib> - -#include "absl/hash/hash.h" - -// Prints the hash of argv[1]. -int main(int argc, char** argv) { - if (argc < 2) return 1; - printf("%zu\n", absl::Hash<int>{}(std::atoi(argv[1]))); // NOLINT -} diff --git a/third_party/abseil_cpp/absl/hash/internal/spy_hash_state.h b/third_party/abseil_cpp/absl/hash/internal/spy_hash_state.h deleted file mode 100644 index c08312081180..000000000000 --- a/third_party/abseil_cpp/absl/hash/internal/spy_hash_state.h +++ /dev/null @@ -1,231 +0,0 @@ -// 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. - -#ifndef ABSL_HASH_INTERNAL_SPY_HASH_STATE_H_ -#define ABSL_HASH_INTERNAL_SPY_HASH_STATE_H_ - -#include <ostream> -#include <string> -#include <vector> - -#include "absl/hash/hash.h" -#include "absl/strings/match.h" -#include "absl/strings/str_format.h" -#include "absl/strings/str_join.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace hash_internal { - -// SpyHashState is an implementation of the HashState API that simply -// accumulates all input bytes in an internal buffer. This makes it useful -// for testing AbslHashValue overloads (so long as they are templated on the -// HashState parameter), since it can report the exact hash representation -// that the AbslHashValue overload produces. -// -// Sample usage: -// EXPECT_EQ(SpyHashState::combine(SpyHashState(), foo), -// SpyHashState::combine(SpyHashState(), bar)); -template <typename T> -class SpyHashStateImpl : public HashStateBase<SpyHashStateImpl<T>> { - public: - SpyHashStateImpl() : error_(std::make_shared<absl::optional<std::string>>()) { - static_assert(std::is_void<T>::value, ""); - } - - // Move-only - SpyHashStateImpl(const SpyHashStateImpl&) = delete; - SpyHashStateImpl& operator=(const SpyHashStateImpl&) = delete; - - SpyHashStateImpl(SpyHashStateImpl&& other) noexcept { - *this = std::move(other); - } - - SpyHashStateImpl& operator=(SpyHashStateImpl&& other) noexcept { - hash_representation_ = std::move(other.hash_representation_); - error_ = other.error_; - moved_from_ = other.moved_from_; - other.moved_from_ = true; - return *this; - } - - template <typename U> - SpyHashStateImpl(SpyHashStateImpl<U>&& other) { // NOLINT - hash_representation_ = std::move(other.hash_representation_); - error_ = other.error_; - moved_from_ = other.moved_from_; - other.moved_from_ = true; - } - - template <typename A, typename... Args> - static SpyHashStateImpl combine(SpyHashStateImpl s, const A& a, - const Args&... args) { - // Pass an instance of SpyHashStateImpl<A> when trying to combine `A`. This - // allows us to test that the user only uses this instance for combine calls - // and does not call AbslHashValue directly. - // See AbslHashValue implementation at the bottom. - s = SpyHashStateImpl<A>::HashStateBase::combine(std::move(s), a); - return SpyHashStateImpl::combine(std::move(s), args...); - } - static SpyHashStateImpl combine(SpyHashStateImpl s) { - if (direct_absl_hash_value_error_) { - *s.error_ = "AbslHashValue should not be invoked directly."; - } else if (s.moved_from_) { - *s.error_ = "Used moved-from instance of the hash state object."; - } - return s; - } - - static void SetDirectAbslHashValueError() { - direct_absl_hash_value_error_ = true; - } - - // Two SpyHashStateImpl objects are equal if they hold equal hash - // representations. - friend bool operator==(const SpyHashStateImpl& lhs, - const SpyHashStateImpl& rhs) { - return lhs.hash_representation_ == rhs.hash_representation_; - } - - friend bool operator!=(const SpyHashStateImpl& lhs, - const SpyHashStateImpl& rhs) { - return !(lhs == rhs); - } - - enum class CompareResult { - kEqual, - kASuffixB, - kBSuffixA, - kUnequal, - }; - - static CompareResult Compare(const SpyHashStateImpl& a, - const SpyHashStateImpl& b) { - const std::string a_flat = absl::StrJoin(a.hash_representation_, ""); - const std::string b_flat = absl::StrJoin(b.hash_representation_, ""); - if (a_flat == b_flat) return CompareResult::kEqual; - if (absl::EndsWith(a_flat, b_flat)) return CompareResult::kBSuffixA; - if (absl::EndsWith(b_flat, a_flat)) return CompareResult::kASuffixB; - return CompareResult::kUnequal; - } - - // operator<< prints the hash representation as a hex and ASCII dump, to - // facilitate debugging. - friend std::ostream& operator<<(std::ostream& out, - const SpyHashStateImpl& hash_state) { - out << "[\n"; - for (auto& s : hash_state.hash_representation_) { - size_t offset = 0; - for (char c : s) { - if (offset % 16 == 0) { - out << absl::StreamFormat("\n0x%04x: ", offset); - } - if (offset % 2 == 0) { - out << " "; - } - out << absl::StreamFormat("%02x", c); - ++offset; - } - out << "\n"; - } - return out << "]"; - } - - // The base case of the combine recursion, which writes raw bytes into the - // internal buffer. - static SpyHashStateImpl combine_contiguous(SpyHashStateImpl hash_state, - const unsigned char* begin, - size_t size) { - const size_t large_chunk_stride = PiecewiseChunkSize(); - if (size > large_chunk_stride) { - // Combining a large contiguous buffer must have the same effect as - // doing it piecewise by the stride length, followed by the (possibly - // empty) remainder. - while (size >= large_chunk_stride) { - hash_state = SpyHashStateImpl::combine_contiguous( - std::move(hash_state), begin, large_chunk_stride); - begin += large_chunk_stride; - size -= large_chunk_stride; - } - } - - hash_state.hash_representation_.emplace_back( - reinterpret_cast<const char*>(begin), size); - return hash_state; - } - - using SpyHashStateImpl::HashStateBase::combine_contiguous; - - absl::optional<std::string> error() const { - if (moved_from_) { - return "Returned a moved-from instance of the hash state object."; - } - return *error_; - } - - private: - template <typename U> - friend class SpyHashStateImpl; - - // This is true if SpyHashStateImpl<T> has been passed to a call of - // AbslHashValue with the wrong type. This detects that the user called - // AbslHashValue directly (because the hash state type does not match). - static bool direct_absl_hash_value_error_; - - std::vector<std::string> hash_representation_; - // This is a shared_ptr because we want all instances of the particular - // SpyHashState run to share the field. This way we can set the error for - // use-after-move and all the copies will see it. - std::shared_ptr<absl::optional<std::string>> error_; - bool moved_from_ = false; -}; - -template <typename T> -bool SpyHashStateImpl<T>::direct_absl_hash_value_error_; - -template <bool& B> -struct OdrUse { - constexpr OdrUse() {} - bool& b = B; -}; - -template <void (*)()> -struct RunOnStartup { - static bool run; - static constexpr OdrUse<run> kOdrUse{}; -}; - -template <void (*f)()> -bool RunOnStartup<f>::run = (f(), true); - -template < - typename T, typename U, - // Only trigger for when (T != U), - typename = absl::enable_if_t<!std::is_same<T, U>::value>, - // This statement works in two ways: - // - First, it instantiates RunOnStartup and forces the initialization of - // `run`, which set the global variable. - // - Second, it triggers a SFINAE error disabling the overload to prevent - // compile time errors. If we didn't disable the overload we would get - // ambiguous overload errors, which we don't want. - int = RunOnStartup<SpyHashStateImpl<T>::SetDirectAbslHashValueError>::run> -void AbslHashValue(SpyHashStateImpl<T>, const U&); - -using SpyHashState = SpyHashStateImpl<void>; - -} // namespace hash_internal -ABSL_NAMESPACE_END -} // namespace absl - -#endif // ABSL_HASH_INTERNAL_SPY_HASH_STATE_H_ |