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, 836 insertions, 0 deletions

diff --git a/third_party/abseil_cpp/absl/container/fixed_array_test.cc b/third_party/abseil_cpp/absl/container/fixed_array_test.cc
new file mode 100644
index 000000000000..064a88a239bd
--- /dev/null
+++ b/third_party/abseil_cpp/absl/container/fixed_array_test.cc
@@ -0,0 +1,836 @@
+// 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.
+
+#include "absl/container/fixed_array.h"
+
+#include <stdio.h>
+
+#include <cstring>
+#include <list>
+#include <memory>
+#include <numeric>
+#include <scoped_allocator>
+#include <stdexcept>
+#include <string>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/exception_testing.h"
+#include "absl/base/options.h"
+#include "absl/container/internal/counting_allocator.h"
+#include "absl/hash/hash_testing.h"
+#include "absl/memory/memory.h"
+
+using ::testing::ElementsAreArray;
+
+namespace {
+
+// Helper routine to determine if a absl::FixedArray used stack allocation.
+template <typename ArrayType>
+static bool IsOnStack(const ArrayType& a) {
+  return a.size() <= ArrayType::inline_elements;
+}
+
+class ConstructionTester {
+ public:
+  ConstructionTester() : self_ptr_(this), value_(0) { constructions++; }
+  ~ConstructionTester() {
+    assert(self_ptr_ == this);
+    self_ptr_ = nullptr;
+    destructions++;
+  }
+
+  // These are incremented as elements are constructed and destructed so we can
+  // be sure all elements are properly cleaned up.
+  static int constructions;
+  static int destructions;
+
+  void CheckConstructed() { assert(self_ptr_ == this); }
+
+  void set(int value) { value_ = value; }
+  int get() { return value_; }
+
+ private:
+  // self_ptr_ should always point to 'this' -- that's how we can be sure the
+  // constructor has been called.
+  ConstructionTester* self_ptr_;
+  int value_;
+};
+
+int ConstructionTester::constructions = 0;
+int ConstructionTester::destructions = 0;
+
+// ThreeInts will initialize its three ints to the value stored in
+// ThreeInts::counter. The constructor increments counter so that each object
+// in an array of ThreeInts will have different values.
+class ThreeInts {
+ public:
+  ThreeInts() {
+    x_ = counter;
+    y_ = counter;
+    z_ = counter;
+    ++counter;
+  }
+
+  static int counter;
+
+  int x_, y_, z_;
+};
+
+int ThreeInts::counter = 0;
+
+TEST(FixedArrayTest, CopyCtor) {
+  absl::FixedArray<int, 10> on_stack(5);
+  std::iota(on_stack.begin(), on_stack.end(), 0);
+  absl::FixedArray<int, 10> stack_copy = on_stack;
+  EXPECT_THAT(stack_copy, ElementsAreArray(on_stack));
+  EXPECT_TRUE(IsOnStack(stack_copy));
+
+  absl::FixedArray<int, 10> allocated(15);
+  std::iota(allocated.begin(), allocated.end(), 0);
+  absl::FixedArray<int, 10> alloced_copy = allocated;
+  EXPECT_THAT(alloced_copy, ElementsAreArray(allocated));
+  EXPECT_FALSE(IsOnStack(alloced_copy));
+}
+
+TEST(FixedArrayTest, MoveCtor) {
+  absl::FixedArray<std::unique_ptr<int>, 10> on_stack(5);
+  for (int i = 0; i < 5; ++i) {
+    on_stack[i] = absl::make_unique<int>(i);
+  }
+
+  absl::FixedArray<std::unique_ptr<int>, 10> stack_copy = std::move(on_stack);
+  for (int i = 0; i < 5; ++i) EXPECT_EQ(*(stack_copy[i]), i);
+  EXPECT_EQ(stack_copy.size(), on_stack.size());
+
+  absl::FixedArray<std::unique_ptr<int>, 10> allocated(15);
+  for (int i = 0; i < 15; ++i) {
+    allocated[i] = absl::make_unique<int>(i);
+  }
+
+  absl::FixedArray<std::unique_ptr<int>, 10> alloced_copy =
+      std::move(allocated);
+  for (int i = 0; i < 15; ++i) EXPECT_EQ(*(alloced_copy[i]), i);
+  EXPECT_EQ(allocated.size(), alloced_copy.size());
+}
+
+TEST(FixedArrayTest, SmallObjects) {
+  // Small object arrays
+  {
+    // Short arrays should be on the stack
+    absl::FixedArray<int> array(4);
+    EXPECT_TRUE(IsOnStack(array));
+  }
+
+  {
+    // Large arrays should be on the heap
+    absl::FixedArray<int> array(1048576);
+    EXPECT_FALSE(IsOnStack(array));
+  }
+
+  {
+    // Arrays of <= default size should be on the stack
+    absl::FixedArray<int, 100> array(100);
+    EXPECT_TRUE(IsOnStack(array));
+  }
+
+  {
+    // Arrays of > default size should be on the heap
+    absl::FixedArray<int, 100> array(101);
+    EXPECT_FALSE(IsOnStack(array));
+  }
+
+  {
+    // Arrays with different size elements should use approximately
+    // same amount of stack space
+    absl::FixedArray<int> array1(0);
+    absl::FixedArray<char> array2(0);
+    EXPECT_LE(sizeof(array1), sizeof(array2) + 100);
+    EXPECT_LE(sizeof(array2), sizeof(array1) + 100);
+  }
+
+  {
+    // Ensure that vectors are properly constructed inside a fixed array.
+    absl::FixedArray<std::vector<int>> array(2);
+    EXPECT_EQ(0, array[0].size());
+    EXPECT_EQ(0, array[1].size());
+  }
+
+  {
+    // Regardless of absl::FixedArray implementation, check that a type with a
+    // low alignment requirement and a non power-of-two size is initialized
+    // correctly.
+    ThreeInts::counter = 1;
+    absl::FixedArray<ThreeInts> array(2);
+    EXPECT_EQ(1, array[0].x_);
+    EXPECT_EQ(1, array[0].y_);
+    EXPECT_EQ(1, array[0].z_);
+    EXPECT_EQ(2, array[1].x_);
+    EXPECT_EQ(2, array[1].y_);
+    EXPECT_EQ(2, array[1].z_);
+  }
+}
+
+TEST(FixedArrayTest, AtThrows) {
+  absl::FixedArray<int> a = {1, 2, 3};
+  EXPECT_EQ(a.at(2), 3);
+  ABSL_BASE_INTERNAL_EXPECT_FAIL(a.at(3), std::out_of_range,
+                                 "failed bounds check");
+}
+
+TEST(FixedArrayTest, Hardened) {
+#if !defined(NDEBUG) || ABSL_OPTION_HARDENED
+  absl::FixedArray<int> a = {1, 2, 3};
+  EXPECT_EQ(a[2], 3);
+  EXPECT_DEATH_IF_SUPPORTED(a[3], "");
+  EXPECT_DEATH_IF_SUPPORTED(a[-1], "");
+
+  absl::FixedArray<int> empty(0);
+  EXPECT_DEATH_IF_SUPPORTED(empty[0], "");
+  EXPECT_DEATH_IF_SUPPORTED(empty[-1], "");
+  EXPECT_DEATH_IF_SUPPORTED(empty.front(), "");
+  EXPECT_DEATH_IF_SUPPORTED(empty.back(), "");
+#endif
+}
+
+TEST(FixedArrayRelationalsTest, EqualArrays) {
+  for (int i = 0; i < 10; ++i) {
+    absl::FixedArray<int, 5> a1(i);
+    std::iota(a1.begin(), a1.end(), 0);
+    absl::FixedArray<int, 5> a2(a1.begin(), a1.end());
+
+    EXPECT_TRUE(a1 == a2);
+    EXPECT_FALSE(a1 != a2);
+    EXPECT_TRUE(a2 == a1);
+    EXPECT_FALSE(a2 != a1);
+    EXPECT_FALSE(a1 < a2);
+    EXPECT_FALSE(a1 > a2);
+    EXPECT_FALSE(a2 < a1);
+    EXPECT_FALSE(a2 > a1);
+    EXPECT_TRUE(a1 <= a2);
+    EXPECT_TRUE(a1 >= a2);
+    EXPECT_TRUE(a2 <= a1);
+    EXPECT_TRUE(a2 >= a1);
+  }
+}
+
+TEST(FixedArrayRelationalsTest, UnequalArrays) {
+  for (int i = 1; i < 10; ++i) {
+    absl::FixedArray<int, 5> a1(i);
+    std::iota(a1.begin(), a1.end(), 0);
+    absl::FixedArray<int, 5> a2(a1.begin(), a1.end());
+    --a2[i / 2];
+
+    EXPECT_FALSE(a1 == a2);
+    EXPECT_TRUE(a1 != a2);
+    EXPECT_FALSE(a2 == a1);
+    EXPECT_TRUE(a2 != a1);
+    EXPECT_FALSE(a1 < a2);
+    EXPECT_TRUE(a1 > a2);
+    EXPECT_TRUE(a2 < a1);
+    EXPECT_FALSE(a2 > a1);
+    EXPECT_FALSE(a1 <= a2);
+    EXPECT_TRUE(a1 >= a2);
+    EXPECT_TRUE(a2 <= a1);
+    EXPECT_FALSE(a2 >= a1);
+  }
+}
+
+template <int stack_elements>
+static void TestArray(int n) {
+  SCOPED_TRACE(n);
+  SCOPED_TRACE(stack_elements);
+  ConstructionTester::constructions = 0;
+  ConstructionTester::destructions = 0;
+  {
+    absl::FixedArray<ConstructionTester, stack_elements> array(n);
+
+    EXPECT_THAT(array.size(), n);
+    EXPECT_THAT(array.memsize(), sizeof(ConstructionTester) * n);
+    EXPECT_THAT(array.begin() + n, array.end());
+
+    // Check that all elements were constructed
+    for (int i = 0; i < n; i++) {
+      array[i].CheckConstructed();
+    }
+    // Check that no other elements were constructed
+    EXPECT_THAT(ConstructionTester::constructions, n);
+
+    // Test operator[]
+    for (int i = 0; i < n; i++) {
+      array[i].set(i);
+    }
+    for (int i = 0; i < n; i++) {
+      EXPECT_THAT(array[i].get(), i);
+      EXPECT_THAT(array.data()[i].get(), i);
+    }
+
+    // Test data()
+    for (int i = 0; i < n; i++) {
+      array.data()[i].set(i + 1);
+    }
+    for (int i = 0; i < n; i++) {
+      EXPECT_THAT(array[i].get(), i + 1);
+      EXPECT_THAT(array.data()[i].get(), i + 1);
+    }
+  }  // Close scope containing 'array'.
+
+  // Check that all constructed elements were destructed.
+  EXPECT_EQ(ConstructionTester::constructions,
+            ConstructionTester::destructions);
+}
+
+template <int elements_per_inner_array, int inline_elements>
+static void TestArrayOfArrays(int n) {
+  SCOPED_TRACE(n);
+  SCOPED_TRACE(inline_elements);
+  SCOPED_TRACE(elements_per_inner_array);
+  ConstructionTester::constructions = 0;
+  ConstructionTester::destructions = 0;
+  {
+    using InnerArray = ConstructionTester[elements_per_inner_array];
+    // Heap-allocate the FixedArray to avoid blowing the stack frame.
+    auto array_ptr =
+        absl::make_unique<absl::FixedArray<InnerArray, inline_elements>>(n);
+    auto& array = *array_ptr;
+
+    ASSERT_EQ(array.size(), n);
+    ASSERT_EQ(array.memsize(),
+              sizeof(ConstructionTester) * elements_per_inner_array * n);
+    ASSERT_EQ(array.begin() + n, array.end());
+
+    // Check that all elements were constructed
+    for (int i = 0; i < n; i++) {
+      for (int j = 0; j < elements_per_inner_array; j++) {
+        (array[i])[j].CheckConstructed();
+      }
+    }
+    // Check that no other elements were constructed
+    ASSERT_EQ(ConstructionTester::constructions, n * elements_per_inner_array);
+
+    // Test operator[]
+    for (int i = 0; i < n; i++) {
+      for (int j = 0; j < elements_per_inner_array; j++) {
+        (array[i])[j].set(i * elements_per_inner_array + j);
+      }
+    }
+    for (int i = 0; i < n; i++) {
+      for (int j = 0; j < elements_per_inner_array; j++) {
+        ASSERT_EQ((array[i])[j].get(), i * elements_per_inner_array + j);
+        ASSERT_EQ((array.data()[i])[j].get(), i * elements_per_inner_array + j);
+      }
+    }
+
+    // Test data()
+    for (int i = 0; i < n; i++) {
+      for (int j = 0; j < elements_per_inner_array; j++) {
+        (array.data()[i])[j].set((i + 1) * elements_per_inner_array + j);
+      }
+    }
+    for (int i = 0; i < n; i++) {
+      for (int j = 0; j < elements_per_inner_array; j++) {
+        ASSERT_EQ((array[i])[j].get(), (i + 1) * elements_per_inner_array + j);
+        ASSERT_EQ((array.data()[i])[j].get(),
+                  (i + 1) * elements_per_inner_array + j);
+      }
+    }
+  }  // Close scope containing 'array'.
+
+  // Check that all constructed elements were destructed.
+  EXPECT_EQ(ConstructionTester::constructions,
+            ConstructionTester::destructions);
+}
+
+TEST(IteratorConstructorTest, NonInline) {
+  int const kInput[] = {2, 3, 5, 7, 11, 13, 17};
+  absl::FixedArray<int, ABSL_ARRAYSIZE(kInput) - 1> const fixed(
+      kInput, kInput + ABSL_ARRAYSIZE(kInput));
+  ASSERT_EQ(ABSL_ARRAYSIZE(kInput), fixed.size());
+  for (size_t i = 0; i < ABSL_ARRAYSIZE(kInput); ++i) {
+    ASSERT_EQ(kInput[i], fixed[i]);
+  }
+}
+
+TEST(IteratorConstructorTest, Inline) {
+  int const kInput[] = {2, 3, 5, 7, 11, 13, 17};
+  absl::FixedArray<int, ABSL_ARRAYSIZE(kInput)> const fixed(
+      kInput, kInput + ABSL_ARRAYSIZE(kInput));
+  ASSERT_EQ(ABSL_ARRAYSIZE(kInput), fixed.size());
+  for (size_t i = 0; i < ABSL_ARRAYSIZE(kInput); ++i) {
+    ASSERT_EQ(kInput[i], fixed[i]);
+  }
+}
+
+TEST(IteratorConstructorTest, NonPod) {
+  char const* kInput[] = {"red",  "orange", "yellow", "green",
+                          "blue", "indigo", "violet"};
+  absl::FixedArray<std::string> const fixed(kInput,
+                                            kInput + ABSL_ARRAYSIZE(kInput));
+  ASSERT_EQ(ABSL_ARRAYSIZE(kInput), fixed.size());
+  for (size_t i = 0; i < ABSL_ARRAYSIZE(kInput); ++i) {
+    ASSERT_EQ(kInput[i], fixed[i]);
+  }
+}
+
+TEST(IteratorConstructorTest, FromEmptyVector) {
+  std::vector<int> const empty;
+  absl::FixedArray<int> const fixed(empty.begin(), empty.end());
+  EXPECT_EQ(0, fixed.size());
+  EXPECT_EQ(empty.size(), fixed.size());
+}
+
+TEST(IteratorConstructorTest, FromNonEmptyVector) {
+  int const kInput[] = {2, 3, 5, 7, 11, 13, 17};
+  std::vector<int> const items(kInput, kInput + ABSL_ARRAYSIZE(kInput));
+  absl::FixedArray<int> const fixed(items.begin(), items.end());
+  ASSERT_EQ(items.size(), fixed.size());
+  for (size_t i = 0; i < items.size(); ++i) {
+    ASSERT_EQ(items[i], fixed[i]);
+  }
+}
+
+TEST(IteratorConstructorTest, FromBidirectionalIteratorRange) {
+  int const kInput[] = {2, 3, 5, 7, 11, 13, 17};
+  std::list<int> const items(kInput, kInput + ABSL_ARRAYSIZE(kInput));
+  absl::FixedArray<int> const fixed(items.begin(), items.end());
+  EXPECT_THAT(fixed, testing::ElementsAreArray(kInput));
+}
+
+TEST(InitListConstructorTest, InitListConstruction) {
+  absl::FixedArray<int> fixed = {1, 2, 3};
+  EXPECT_THAT(fixed, testing::ElementsAreArray({1, 2, 3}));
+}
+
+TEST(FillConstructorTest, NonEmptyArrays) {
+  absl::FixedArray<int> stack_array(4, 1);
+  EXPECT_THAT(stack_array, testing::ElementsAreArray({1, 1, 1, 1}));
+
+  absl::FixedArray<int, 0> heap_array(4, 1);
+  EXPECT_THAT(stack_array, testing::ElementsAreArray({1, 1, 1, 1}));
+}
+
+TEST(FillConstructorTest, EmptyArray) {
+  absl::FixedArray<int> empty_fill(0, 1);
+  absl::FixedArray<int> empty_size(0);
+  EXPECT_EQ(empty_fill, empty_size);
+}
+
+TEST(FillConstructorTest, NotTriviallyCopyable) {
+  std::string str = "abcd";
+  absl::FixedArray<std::string> strings = {str, str, str, str};
+
+  absl::FixedArray<std::string> array(4, str);
+  EXPECT_EQ(array, strings);
+}
+
+TEST(FillConstructorTest, Disambiguation) {
+  absl::FixedArray<size_t> a(1, 2);
+  EXPECT_THAT(a, testing::ElementsAre(2));
+}
+
+TEST(FixedArrayTest, ManySizedArrays) {
+  std::vector<int> sizes;
+  for (int i = 1; i < 100; i++) sizes.push_back(i);
+  for (int i = 100; i <= 1000; i += 100) sizes.push_back(i);
+  for (int n : sizes) {
+    TestArray<0>(n);
+    TestArray<1>(n);
+    TestArray<64>(n);
+    TestArray<1000>(n);
+  }
+}
+
+TEST(FixedArrayTest, ManySizedArraysOfArraysOf1) {
+  for (int n = 1; n < 1000; n++) {
+    ASSERT_NO_FATAL_FAILURE((TestArrayOfArrays<1, 0>(n)));
+    ASSERT_NO_FATAL_FAILURE((TestArrayOfArrays<1, 1>(n)));
+    ASSERT_NO_FATAL_FAILURE((TestArrayOfArrays<1, 64>(n)));
+    ASSERT_NO_FATAL_FAILURE((TestArrayOfArrays<1, 1000>(n)));
+  }
+}
+
+TEST(FixedArrayTest, ManySizedArraysOfArraysOf2) {
+  for (int n = 1; n < 1000; n++) {
+    TestArrayOfArrays<2, 0>(n);
+    TestArrayOfArrays<2, 1>(n);
+    TestArrayOfArrays<2, 64>(n);
+    TestArrayOfArrays<2, 1000>(n);
+  }
+}
+
+// If value_type is put inside of a struct container,
+// we might evoke this error in a hardened build unless data() is carefully
+// written, so check on that.
+//     error: call to int __builtin___sprintf_chk(etc...)
+//     will always overflow destination buffer [-Werror]
+TEST(FixedArrayTest, AvoidParanoidDiagnostics) {
+  absl::FixedArray<char, 32> buf(32);
+  sprintf(buf.data(), "foo");  // NOLINT(runtime/printf)
+}
+
+TEST(FixedArrayTest, TooBigInlinedSpace) {
+  struct TooBig {
+    char c[1 << 20];
+  };  // too big for even one on the stack
+
+  // Simulate the data members of absl::FixedArray, a pointer and a size_t.
+  struct Data {
+    TooBig* p;
+    size_t size;
+  };
+
+  // Make sure TooBig objects are not inlined for 0 or default size.
+  static_assert(sizeof(absl::FixedArray<TooBig, 0>) == sizeof(Data),
+                "0-sized absl::FixedArray should have same size as Data.");
+  static_assert(alignof(absl::FixedArray<TooBig, 0>) == alignof(Data),
+                "0-sized absl::FixedArray should have same alignment as Data.");
+  static_assert(sizeof(absl::FixedArray<TooBig>) == sizeof(Data),
+                "default-sized absl::FixedArray should have same size as Data");
+  static_assert(
+      alignof(absl::FixedArray<TooBig>) == alignof(Data),
+      "default-sized absl::FixedArray should have same alignment as Data.");
+}
+
+// PickyDelete EXPECTs its class-scope deallocation funcs are unused.
+struct PickyDelete {
+  PickyDelete() {}
+  ~PickyDelete() {}
+  void operator delete(void* p) {
+    EXPECT_TRUE(false) << __FUNCTION__;
+    ::operator delete(p);
+  }
+  void operator delete[](void* p) {
+    EXPECT_TRUE(false) << __FUNCTION__;
+    ::operator delete[](p);
+  }
+};
+
+TEST(FixedArrayTest, UsesGlobalAlloc) { absl::FixedArray<PickyDelete, 0> a(5); }
+
+TEST(FixedArrayTest, Data) {
+  static const int kInput[] = {2, 3, 5, 7, 11, 13, 17};
+  absl::FixedArray<int> fa(std::begin(kInput), std::end(kInput));
+  EXPECT_EQ(fa.data(), &*fa.begin());
+  EXPECT_EQ(fa.data(), &fa[0]);
+
+  const absl::FixedArray<int>& cfa = fa;
+  EXPECT_EQ(cfa.data(), &*cfa.begin());
+  EXPECT_EQ(cfa.data(), &cfa[0]);
+}
+
+TEST(FixedArrayTest, Empty) {
+  absl::FixedArray<int> empty(0);
+  absl::FixedArray<int> inline_filled(1);
+  absl::FixedArray<int, 0> heap_filled(1);
+  EXPECT_TRUE(empty.empty());
+  EXPECT_FALSE(inline_filled.empty());
+  EXPECT_FALSE(heap_filled.empty());
+}
+
+TEST(FixedArrayTest, FrontAndBack) {
+  absl::FixedArray<int, 3 * sizeof(int)> inlined = {1, 2, 3};
+  EXPECT_EQ(inlined.front(), 1);
+  EXPECT_EQ(inlined.back(), 3);
+
+  absl::FixedArray<int, 0> allocated = {1, 2, 3};
+  EXPECT_EQ(allocated.front(), 1);
+  EXPECT_EQ(allocated.back(), 3);
+
+  absl::FixedArray<int> one_element = {1};
+  EXPECT_EQ(one_element.front(), one_element.back());
+}
+
+TEST(FixedArrayTest, ReverseIteratorInlined) {
+  absl::FixedArray<int, 5 * sizeof(int)> a = {0, 1, 2, 3, 4};
+
+  int counter = 5;
+  for (absl::FixedArray<int>::reverse_iterator iter = a.rbegin();
+       iter != a.rend(); ++iter) {
+    counter--;
+    EXPECT_EQ(counter, *iter);
+  }
+  EXPECT_EQ(counter, 0);
+
+  counter = 5;
+  for (absl::FixedArray<int>::const_reverse_iterator iter = a.rbegin();
+       iter != a.rend(); ++iter) {
+    counter--;
+    EXPECT_EQ(counter, *iter);
+  }
+  EXPECT_EQ(counter, 0);
+
+  counter = 5;
+  for (auto iter = a.crbegin(); iter != a.crend(); ++iter) {
+    counter--;
+    EXPECT_EQ(counter, *iter);
+  }
+  EXPECT_EQ(counter, 0);
+}
+
+TEST(FixedArrayTest, ReverseIteratorAllocated) {
+  absl::FixedArray<int, 0> a = {0, 1, 2, 3, 4};
+
+  int counter = 5;
+  for (absl::FixedArray<int>::reverse_iterator iter = a.rbegin();
+       iter != a.rend(); ++iter) {
+    counter--;
+    EXPECT_EQ(counter, *iter);
+  }
+  EXPECT_EQ(counter, 0);
+
+  counter = 5;
+  for (absl::FixedArray<int>::const_reverse_iterator iter = a.rbegin();
+       iter != a.rend(); ++iter) {
+    counter--;
+    EXPECT_EQ(counter, *iter);
+  }
+  EXPECT_EQ(counter, 0);
+
+  counter = 5;
+  for (auto iter = a.crbegin(); iter != a.crend(); ++iter) {
+    counter--;
+    EXPECT_EQ(counter, *iter);
+  }
+  EXPECT_EQ(counter, 0);
+}
+
+TEST(FixedArrayTest, Fill) {
+  absl::FixedArray<int, 5 * sizeof(int)> inlined(5);
+  int fill_val = 42;
+  inlined.fill(fill_val);
+  for (int i : inlined) EXPECT_EQ(i, fill_val);
+
+  absl::FixedArray<int, 0> allocated(5);
+  allocated.fill(fill_val);
+  for (int i : allocated) EXPECT_EQ(i, fill_val);
+
+  // It doesn't do anything, just make sure this compiles.
+  absl::FixedArray<int> empty(0);
+  empty.fill(fill_val);
+}
+
+#ifndef __GNUC__
+TEST(FixedArrayTest, DefaultCtorDoesNotValueInit) {
+  using T = char;
+  constexpr auto capacity = 10;
+  using FixedArrType = absl::FixedArray<T, capacity>;
+  constexpr auto scrubbed_bits = 0x95;
+  constexpr auto length = capacity / 2;
+
+  alignas(FixedArrType) unsigned char buff[sizeof(FixedArrType)];
+  std::memset(std::addressof(buff), scrubbed_bits, sizeof(FixedArrType));
+
+  FixedArrType* arr =
+      ::new (static_cast<void*>(std::addressof(buff))) FixedArrType(length);
+  EXPECT_THAT(*arr, testing::Each(scrubbed_bits));
+  arr->~FixedArrType();
+}
+#endif  // __GNUC__
+
+TEST(AllocatorSupportTest, CountInlineAllocations) {
+  constexpr size_t inlined_size = 4;
+  using Alloc = absl::container_internal::CountingAllocator<int>;
+  using AllocFxdArr = absl::FixedArray<int, inlined_size, Alloc>;
+
+  int64_t allocated = 0;
+  int64_t active_instances = 0;
+
+  {
+    const int ia[] = {0, 1, 2, 3, 4, 5, 6, 7};
+
+    Alloc alloc(&allocated, &active_instances);
+
+    AllocFxdArr arr(ia, ia + inlined_size, alloc);
+    static_cast<void>(arr);
+  }
+
+  EXPECT_EQ(allocated, 0);
+  EXPECT_EQ(active_instances, 0);
+}
+
+TEST(AllocatorSupportTest, CountOutoflineAllocations) {
+  constexpr size_t inlined_size = 4;
+  using Alloc = absl::container_internal::CountingAllocator<int>;
+  using AllocFxdArr = absl::FixedArray<int, inlined_size, Alloc>;
+
+  int64_t allocated = 0;
+  int64_t active_instances = 0;
+
+  {
+    const int ia[] = {0, 1, 2, 3, 4, 5, 6, 7};
+    Alloc alloc(&allocated, &active_instances);
+
+    AllocFxdArr arr(ia, ia + ABSL_ARRAYSIZE(ia), alloc);
+
+    EXPECT_EQ(allocated, arr.size() * sizeof(int));
+    static_cast<void>(arr);
+  }
+
+  EXPECT_EQ(active_instances, 0);
+}
+
+TEST(AllocatorSupportTest, CountCopyInlineAllocations) {
+  constexpr size_t inlined_size = 4;
+  using Alloc = absl::container_internal::CountingAllocator<int>;
+  using AllocFxdArr = absl::FixedArray<int, inlined_size, Alloc>;
+
+  int64_t allocated1 = 0;
+  int64_t allocated2 = 0;
+  int64_t active_instances = 0;
+  Alloc alloc(&allocated1, &active_instances);
+  Alloc alloc2(&allocated2, &active_instances);
+
+  {
+    int initial_value = 1;
+
+    AllocFxdArr arr1(inlined_size / 2, initial_value, alloc);
+
+    EXPECT_EQ(allocated1, 0);
+
+    AllocFxdArr arr2(arr1, alloc2);
+
+    EXPECT_EQ(allocated2, 0);
+    static_cast<void>(arr1);
+    static_cast<void>(arr2);
+  }
+
+  EXPECT_EQ(active_instances, 0);
+}
+
+TEST(AllocatorSupportTest, CountCopyOutoflineAllocations) {
+  constexpr size_t inlined_size = 4;
+  using Alloc = absl::container_internal::CountingAllocator<int>;
+  using AllocFxdArr = absl::FixedArray<int, inlined_size, Alloc>;
+
+  int64_t allocated1 = 0;
+  int64_t allocated2 = 0;
+  int64_t active_instances = 0;
+  Alloc alloc(&allocated1, &active_instances);
+  Alloc alloc2(&allocated2, &active_instances);
+
+  {
+    int initial_value = 1;
+
+    AllocFxdArr arr1(inlined_size * 2, initial_value, alloc);
+
+    EXPECT_EQ(allocated1, arr1.size() * sizeof(int));
+
+    AllocFxdArr arr2(arr1, alloc2);
+
+    EXPECT_EQ(allocated2, inlined_size * 2 * sizeof(int));
+    static_cast<void>(arr1);
+    static_cast<void>(arr2);
+  }
+
+  EXPECT_EQ(active_instances, 0);
+}
+
+TEST(AllocatorSupportTest, SizeValAllocConstructor) {
+  using testing::AllOf;
+  using testing::Each;
+  using testing::SizeIs;
+
+  constexpr size_t inlined_size = 4;
+  using Alloc = absl::container_internal::CountingAllocator<int>;
+  using AllocFxdArr = absl::FixedArray<int, inlined_size, Alloc>;
+
+  {
+    auto len = inlined_size / 2;
+    auto val = 0;
+    int64_t allocated = 0;
+    AllocFxdArr arr(len, val, Alloc(&allocated));
+
+    EXPECT_EQ(allocated, 0);
+    EXPECT_THAT(arr, AllOf(SizeIs(len), Each(0)));
+  }
+
+  {
+    auto len = inlined_size * 2;
+    auto val = 0;
+    int64_t allocated = 0;
+    AllocFxdArr arr(len, val, Alloc(&allocated));
+
+    EXPECT_EQ(allocated, len * sizeof(int));
+    EXPECT_THAT(arr, AllOf(SizeIs(len), Each(0)));
+  }
+}
+
+#ifdef ADDRESS_SANITIZER
+TEST(FixedArrayTest, AddressSanitizerAnnotations1) {
+  absl::FixedArray<int, 32> a(10);
+  int* raw = a.data();
+  raw[0] = 0;
+  raw[9] = 0;
+  EXPECT_DEATH_IF_SUPPORTED(raw[-2] = 0, "container-overflow");
+  EXPECT_DEATH_IF_SUPPORTED(raw[-1] = 0, "container-overflow");
+  EXPECT_DEATH_IF_SUPPORTED(raw[10] = 0, "container-overflow");
+  EXPECT_DEATH_IF_SUPPORTED(raw[31] = 0, "container-overflow");
+}
+
+TEST(FixedArrayTest, AddressSanitizerAnnotations2) {
+  absl::FixedArray<char, 17> a(12);
+  char* raw = a.data();
+  raw[0] = 0;
+  raw[11] = 0;
+  EXPECT_DEATH_IF_SUPPORTED(raw[-7] = 0, "container-overflow");
+  EXPECT_DEATH_IF_SUPPORTED(raw[-1] = 0, "container-overflow");
+  EXPECT_DEATH_IF_SUPPORTED(raw[12] = 0, "container-overflow");
+  EXPECT_DEATH_IF_SUPPORTED(raw[17] = 0, "container-overflow");
+}
+
+TEST(FixedArrayTest, AddressSanitizerAnnotations3) {
+  absl::FixedArray<uint64_t, 20> a(20);
+  uint64_t* raw = a.data();
+  raw[0] = 0;
+  raw[19] = 0;
+  EXPECT_DEATH_IF_SUPPORTED(raw[-1] = 0, "container-overflow");
+  EXPECT_DEATH_IF_SUPPORTED(raw[20] = 0, "container-overflow");
+}
+
+TEST(FixedArrayTest, AddressSanitizerAnnotations4) {
+  absl::FixedArray<ThreeInts> a(10);
+  ThreeInts* raw = a.data();
+  raw[0] = ThreeInts();
+  raw[9] = ThreeInts();
+  // Note: raw[-1] is pointing to 12 bytes before the container range. However,
+  // there is only a 8-byte red zone before the container range, so we only
+  // access the last 4 bytes of the struct to make sure it stays within the red
+  // zone.
+  EXPECT_DEATH_IF_SUPPORTED(raw[-1].z_ = 0, "container-overflow");
+  EXPECT_DEATH_IF_SUPPORTED(raw[10] = ThreeInts(), "container-overflow");
+  // The actual size of storage is kDefaultBytes=256, 21*12 = 252,
+  // so reading raw[21] should still trigger the correct warning.
+  EXPECT_DEATH_IF_SUPPORTED(raw[21] = ThreeInts(), "container-overflow");
+}
+#endif  // ADDRESS_SANITIZER
+
+TEST(FixedArrayTest, AbslHashValueWorks) {
+  using V = absl::FixedArray<int>;
+  std::vector<V> cases;
+
+  // Generate a variety of vectors some of these are small enough for the inline
+  // space but are stored out of line.
+  for (int i = 0; i < 10; ++i) {
+    V v(i);
+    for (int j = 0; j < i; ++j) {
+      v[j] = j;
+    }
+    cases.push_back(v);
+  }
+
+  EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(cases));
+}
+
+}  // namespace