Add 'third_party/abseil_cpp/' from commit '768eb2ca2857342673fcd462792ce04b8bac3fa3' r/781

git-subtree-dir: third_party/abseil_cpp
git-subtree-mainline: ffb2ae54beb5796cd408fbe15d2d2da09ff37adf
git-subtree-split: 768eb2ca2857342673fcd462792ce04b8bac3fa3

1 files changed, 263 insertions, 0 deletions

diff --git a/third_party/abseil_cpp/absl/base/internal/endian_test.cc b/third_party/abseil_cpp/absl/base/internal/endian_test.cc
new file mode 100644
index 000000000000..a1691b1f82c0
--- /dev/null
+++ b/third_party/abseil_cpp/absl/base/internal/endian_test.cc
@@ -0,0 +1,263 @@
+// Copyright 2017 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/base/internal/endian.h"
+
+#include <algorithm>
+#include <cstdint>
+#include <limits>
+#include <random>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/base/config.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace {
+
+const uint64_t kInitialNumber{0x0123456789abcdef};
+const uint64_t k64Value{kInitialNumber};
+const uint32_t k32Value{0x01234567};
+const uint16_t k16Value{0x0123};
+const int kNumValuesToTest = 1000000;
+const int kRandomSeed = 12345;
+
+#if defined(ABSL_IS_BIG_ENDIAN)
+const uint64_t kInitialInNetworkOrder{kInitialNumber};
+const uint64_t k64ValueLE{0xefcdab8967452301};
+const uint32_t k32ValueLE{0x67452301};
+const uint16_t k16ValueLE{0x2301};
+
+const uint64_t k64ValueBE{kInitialNumber};
+const uint32_t k32ValueBE{k32Value};
+const uint16_t k16ValueBE{k16Value};
+#elif defined(ABSL_IS_LITTLE_ENDIAN)
+const uint64_t kInitialInNetworkOrder{0xefcdab8967452301};
+const uint64_t k64ValueLE{kInitialNumber};
+const uint32_t k32ValueLE{k32Value};
+const uint16_t k16ValueLE{k16Value};
+
+const uint64_t k64ValueBE{0xefcdab8967452301};
+const uint32_t k32ValueBE{0x67452301};
+const uint16_t k16ValueBE{0x2301};
+#endif
+
+std::vector<uint16_t> GenerateAllUint16Values() {
+  std::vector<uint16_t> result;
+  result.reserve(size_t{1} << (sizeof(uint16_t) * 8));
+  for (uint32_t i = std::numeric_limits<uint16_t>::min();
+       i <= std::numeric_limits<uint16_t>::max(); ++i) {
+    result.push_back(static_cast<uint16_t>(i));
+  }
+  return result;
+}
+
+template<typename T>
+std::vector<T> GenerateRandomIntegers(size_t num_values_to_test) {
+  std::vector<T> result;
+  result.reserve(num_values_to_test);
+  std::mt19937_64 rng(kRandomSeed);
+  for (size_t i = 0; i < num_values_to_test; ++i) {
+    result.push_back(rng());
+  }
+  return result;
+}
+
+void ManualByteSwap(char* bytes, int length) {
+  if (length == 1)
+    return;
+
+  EXPECT_EQ(0, length % 2);
+  for (int i = 0; i < length / 2; ++i) {
+    int j = (length - 1) - i;
+    using std::swap;
+    swap(bytes[i], bytes[j]);
+  }
+}
+
+template<typename T>
+inline T UnalignedLoad(const char* p) {
+  static_assert(
+      sizeof(T) == 1 || sizeof(T) == 2 || sizeof(T) == 4 || sizeof(T) == 8,
+      "Unexpected type size");
+
+  switch (sizeof(T)) {
+    case 1: return *reinterpret_cast<const T*>(p);
+    case 2:
+      return ABSL_INTERNAL_UNALIGNED_LOAD16(p);
+    case 4:
+      return ABSL_INTERNAL_UNALIGNED_LOAD32(p);
+    case 8:
+      return ABSL_INTERNAL_UNALIGNED_LOAD64(p);
+    default:
+      // Suppresses invalid "not all control paths return a value" on MSVC
+      return {};
+  }
+}
+
+template <typename T, typename ByteSwapper>
+static void GBSwapHelper(const std::vector<T>& host_values_to_test,
+                         const ByteSwapper& byte_swapper) {
+  // Test byte_swapper against a manual byte swap.
+  for (typename std::vector<T>::const_iterator it = host_values_to_test.begin();
+       it != host_values_to_test.end(); ++it) {
+    T host_value = *it;
+
+    char actual_value[sizeof(host_value)];
+    memcpy(actual_value, &host_value, sizeof(host_value));
+    byte_swapper(actual_value);
+
+    char expected_value[sizeof(host_value)];
+    memcpy(expected_value, &host_value, sizeof(host_value));
+    ManualByteSwap(expected_value, sizeof(host_value));
+
+    ASSERT_EQ(0, memcmp(actual_value, expected_value, sizeof(host_value)))
+        << "Swap output for 0x" << std::hex << host_value << " does not match. "
+        << "Expected: 0x" << UnalignedLoad<T>(expected_value) << "; "
+        << "actual: 0x" <<  UnalignedLoad<T>(actual_value);
+  }
+}
+
+void Swap16(char* bytes) {
+  ABSL_INTERNAL_UNALIGNED_STORE16(
+      bytes, gbswap_16(ABSL_INTERNAL_UNALIGNED_LOAD16(bytes)));
+}
+
+void Swap32(char* bytes) {
+  ABSL_INTERNAL_UNALIGNED_STORE32(
+      bytes, gbswap_32(ABSL_INTERNAL_UNALIGNED_LOAD32(bytes)));
+}
+
+void Swap64(char* bytes) {
+  ABSL_INTERNAL_UNALIGNED_STORE64(
+      bytes, gbswap_64(ABSL_INTERNAL_UNALIGNED_LOAD64(bytes)));
+}
+
+TEST(EndianessTest, Uint16) {
+  GBSwapHelper(GenerateAllUint16Values(), &Swap16);
+}
+
+TEST(EndianessTest, Uint32) {
+  GBSwapHelper(GenerateRandomIntegers<uint32_t>(kNumValuesToTest), &Swap32);
+}
+
+TEST(EndianessTest, Uint64) {
+  GBSwapHelper(GenerateRandomIntegers<uint64_t>(kNumValuesToTest), &Swap64);
+}
+
+TEST(EndianessTest, ghtonll_gntohll) {
+  // Test that absl::ghtonl compiles correctly
+  uint32_t test = 0x01234567;
+  EXPECT_EQ(absl::gntohl(absl::ghtonl(test)), test);
+
+  uint64_t comp = absl::ghtonll(kInitialNumber);
+  EXPECT_EQ(comp, kInitialInNetworkOrder);
+  comp = absl::gntohll(kInitialInNetworkOrder);
+  EXPECT_EQ(comp, kInitialNumber);
+
+  // Test that htonll and ntohll are each others' inverse functions on a
+  // somewhat assorted batch of numbers. 37 is chosen to not be anything
+  // particularly nice base 2.
+  uint64_t value = 1;
+  for (int i = 0; i < 100; ++i) {
+    comp = absl::ghtonll(absl::gntohll(value));
+    EXPECT_EQ(value, comp);
+    comp = absl::gntohll(absl::ghtonll(value));
+    EXPECT_EQ(value, comp);
+    value *= 37;
+  }
+}
+
+TEST(EndianessTest, little_endian) {
+  // Check little_endian uint16_t.
+  uint64_t comp = little_endian::FromHost16(k16Value);
+  EXPECT_EQ(comp, k16ValueLE);
+  comp = little_endian::ToHost16(k16ValueLE);
+  EXPECT_EQ(comp, k16Value);
+
+  // Check little_endian uint32_t.
+  comp = little_endian::FromHost32(k32Value);
+  EXPECT_EQ(comp, k32ValueLE);
+  comp = little_endian::ToHost32(k32ValueLE);
+  EXPECT_EQ(comp, k32Value);
+
+  // Check little_endian uint64_t.
+  comp = little_endian::FromHost64(k64Value);
+  EXPECT_EQ(comp, k64ValueLE);
+  comp = little_endian::ToHost64(k64ValueLE);
+  EXPECT_EQ(comp, k64Value);
+
+  // Check little-endian Load and store functions.
+  uint16_t u16Buf;
+  uint32_t u32Buf;
+  uint64_t u64Buf;
+
+  little_endian::Store16(&u16Buf, k16Value);
+  EXPECT_EQ(u16Buf, k16ValueLE);
+  comp = little_endian::Load16(&u16Buf);
+  EXPECT_EQ(comp, k16Value);
+
+  little_endian::Store32(&u32Buf, k32Value);
+  EXPECT_EQ(u32Buf, k32ValueLE);
+  comp = little_endian::Load32(&u32Buf);
+  EXPECT_EQ(comp, k32Value);
+
+  little_endian::Store64(&u64Buf, k64Value);
+  EXPECT_EQ(u64Buf, k64ValueLE);
+  comp = little_endian::Load64(&u64Buf);
+  EXPECT_EQ(comp, k64Value);
+}
+
+TEST(EndianessTest, big_endian) {
+  // Check big-endian Load and store functions.
+  uint16_t u16Buf;
+  uint32_t u32Buf;
+  uint64_t u64Buf;
+
+  unsigned char buffer[10];
+  big_endian::Store16(&u16Buf, k16Value);
+  EXPECT_EQ(u16Buf, k16ValueBE);
+  uint64_t comp = big_endian::Load16(&u16Buf);
+  EXPECT_EQ(comp, k16Value);
+
+  big_endian::Store32(&u32Buf, k32Value);
+  EXPECT_EQ(u32Buf, k32ValueBE);
+  comp = big_endian::Load32(&u32Buf);
+  EXPECT_EQ(comp, k32Value);
+
+  big_endian::Store64(&u64Buf, k64Value);
+  EXPECT_EQ(u64Buf, k64ValueBE);
+  comp = big_endian::Load64(&u64Buf);
+  EXPECT_EQ(comp, k64Value);
+
+  big_endian::Store16(buffer + 1, k16Value);
+  EXPECT_EQ(u16Buf, k16ValueBE);
+  comp = big_endian::Load16(buffer + 1);
+  EXPECT_EQ(comp, k16Value);
+
+  big_endian::Store32(buffer + 1, k32Value);
+  EXPECT_EQ(u32Buf, k32ValueBE);
+  comp = big_endian::Load32(buffer + 1);
+  EXPECT_EQ(comp, k32Value);
+
+  big_endian::Store64(buffer + 1, k64Value);
+  EXPECT_EQ(u64Buf, k64ValueBE);
+  comp = big_endian::Load64(buffer + 1);
+  EXPECT_EQ(comp, k64Value);
+}
+
+}  // namespace
+ABSL_NAMESPACE_END
+}  // namespace absl