diff options
Diffstat (limited to 'third_party/abseil_cpp/absl/hash/internal')
| -rw-r--r-- | third_party/abseil_cpp/absl/hash/internal/city.cc | 346 | ||||
| -rw-r--r-- | third_party/abseil_cpp/absl/hash/internal/city.h | 96 | ||||
| -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 | 996 | ||||
| -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 |
7 files changed, 0 insertions, 2342 deletions
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 e122c184b6..0000000000 --- a/third_party/abseil_cpp/absl/hash/internal/city.cc +++ /dev/null @@ -1,346 +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) { - return Hash128to64(uint128(u, v)); -} - -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 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 161c7748ec..0000000000 --- a/third_party/abseil_cpp/absl/hash/internal/city.h +++ /dev/null @@ -1,96 +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 { - -typedef std::pair<uint64_t, uint64_t> uint128; - -inline uint64_t Uint128Low64(const uint128 &x) { return x.first; } -inline uint64_t Uint128High64(const uint128 &x) { return x.second; } - -// 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); - -// Hash 128 input bits down to 64 bits of output. -// This is intended to be a reasonably good hash function. -inline uint64_t Hash128to64(const uint128 &x) { - // Murmur-inspired hashing. - const uint64_t kMul = 0x9ddfea08eb382d69ULL; - uint64_t a = (Uint128Low64(x) ^ Uint128High64(x)) * kMul; - a ^= (a >> 47); - uint64_t b = (Uint128High64(x) ^ a) * kMul; - b ^= (b >> 47); - b *= kMul; - return b; -} - -} // 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 251d381d73..0000000000 --- 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(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 b44ecb3a6b..0000000000 --- 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 9e608f7c3c..0000000000 --- a/third_party/abseil_cpp/absl/hash/internal/hash.h +++ /dev/null @@ -1,996 +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() { - return static_cast<uint64_t>(reinterpret_cast<uintptr_t>(kSeed)); - } - 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 c392125a69..0000000000 --- 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 c083120811..0000000000 --- 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_ |