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Diffstat (limited to 'absl/memory/memory_test.cc')
| -rw-r--r-- | absl/memory/memory_test.cc | 590 |
1 files changed, 590 insertions, 0 deletions
diff --git a/absl/memory/memory_test.cc b/absl/memory/memory_test.cc new file mode 100644 index 00000000..8a5f5522 --- /dev/null +++ b/absl/memory/memory_test.cc @@ -0,0 +1,590 @@ +// 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 +// +// http://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. + +// Tests for pointer utilities. + +#include "absl/memory/memory.h" + +#include <sys/types.h> +#include <cstddef> +#include <memory> +#include <string> +#include <type_traits> +#include <utility> +#include <vector> + +#include "gmock/gmock.h" +#include "gtest/gtest.h" + +namespace { + +using ::testing::ElementsAre; +using ::testing::Return; + +// This class creates observable behavior to verify that a destructor has +// been called, via the instance_count variable. +class DestructorVerifier { + public: + DestructorVerifier() { ++instance_count_; } + DestructorVerifier(const DestructorVerifier&) = delete; + DestructorVerifier& operator=(const DestructorVerifier&) = delete; + ~DestructorVerifier() { --instance_count_; } + + // The number of instances of this class currently active. + static int instance_count() { return instance_count_; } + + private: + // The number of instances of this class currently active. + static int instance_count_; +}; + +int DestructorVerifier::instance_count_ = 0; + +TEST(WrapUniqueTest, WrapUnique) { + // Test that the unique_ptr is constructed properly by verifying that the + // destructor for its payload gets called at the proper time. + { + auto dv = new DestructorVerifier; + EXPECT_EQ(1, DestructorVerifier::instance_count()); + std::unique_ptr<DestructorVerifier> ptr = absl::WrapUnique(dv); + EXPECT_EQ(1, DestructorVerifier::instance_count()); + } + EXPECT_EQ(0, DestructorVerifier::instance_count()); +} +TEST(MakeUniqueTest, Basic) { + std::unique_ptr<std::string> p = absl::make_unique<std::string>(); + EXPECT_EQ("", *p); + p = absl::make_unique<std::string>("hi"); + EXPECT_EQ("hi", *p); +} + +struct MoveOnly { + MoveOnly() = default; + explicit MoveOnly(int i1) : ip1{new int{i1}} {} + MoveOnly(int i1, int i2) : ip1{new int{i1}}, ip2{new int{i2}} {} + std::unique_ptr<int> ip1; + std::unique_ptr<int> ip2; +}; + +struct AcceptMoveOnly { + explicit AcceptMoveOnly(MoveOnly m) : m_(std::move(m)) {} + MoveOnly m_; +}; + +TEST(MakeUniqueTest, MoveOnlyTypeAndValue) { + using ExpectedType = std::unique_ptr<MoveOnly>; + { + auto p = absl::make_unique<MoveOnly>(); + static_assert(std::is_same<decltype(p), ExpectedType>::value, + "unexpected return type"); + EXPECT_TRUE(!p->ip1); + EXPECT_TRUE(!p->ip2); + } + { + auto p = absl::make_unique<MoveOnly>(1); + static_assert(std::is_same<decltype(p), ExpectedType>::value, + "unexpected return type"); + EXPECT_TRUE(p->ip1 && *p->ip1 == 1); + EXPECT_TRUE(!p->ip2); + } + { + auto p = absl::make_unique<MoveOnly>(1, 2); + static_assert(std::is_same<decltype(p), ExpectedType>::value, + "unexpected return type"); + EXPECT_TRUE(p->ip1 && *p->ip1 == 1); + EXPECT_TRUE(p->ip2 && *p->ip2 == 2); + } +} + +TEST(MakeUniqueTest, AcceptMoveOnly) { + auto p = absl::make_unique<AcceptMoveOnly>(MoveOnly()); + p = std::unique_ptr<AcceptMoveOnly>(new AcceptMoveOnly(MoveOnly())); +} + +struct ArrayWatch { + void* operator new[](size_t n) { + allocs().push_back(n); + return ::operator new[](n); + } + void operator delete[](void* p) { + return ::operator delete[](p); + } + static std::vector<size_t>& allocs() { + static auto& v = *new std::vector<size_t>; + return v; + } +}; + +TEST(Make_UniqueTest, Array) { + // Ensure state is clean before we start so that these tests + // are order-agnostic. + ArrayWatch::allocs().clear(); + + auto p = absl::make_unique<ArrayWatch[]>(5); + static_assert(std::is_same<decltype(p), + std::unique_ptr<ArrayWatch[]>>::value, + "unexpected return type"); + EXPECT_THAT(ArrayWatch::allocs(), ElementsAre(5 * sizeof(ArrayWatch))); +} + +#if 0 +// TODO(billydonahue): Make a proper NC test. +// These tests shouldn't compile. +TEST(MakeUniqueTestNC, AcceptMoveOnlyLvalue) { + auto m = MoveOnly(); + auto p = absl::make_unique<AcceptMoveOnly>(m); +} +TEST(MakeUniqueTestNC, KnownBoundArray) { + auto p = absl::make_unique<ArrayWatch[5]>(); +} +#endif + +TEST(RawPtrTest, RawPointer) { + int i = 5; + EXPECT_EQ(&i, absl::RawPtr(&i)); +} + +TEST(RawPtrTest, SmartPointer) { + int* o = new int(5); + std::unique_ptr<int> p(o); + EXPECT_EQ(o, absl::RawPtr(p)); +} + +class IntPointerNonConstDeref { + public: + explicit IntPointerNonConstDeref(int* p) : p_(p) {} + friend bool operator!=(const IntPointerNonConstDeref& a, std::nullptr_t) { + return a.p_ != nullptr; + } + int& operator*() { return *p_; } + + private: + std::unique_ptr<int> p_; +}; + +TEST(RawPtrTest, SmartPointerNonConstDereference) { + int* o = new int(5); + IntPointerNonConstDeref p(o); + EXPECT_EQ(o, absl::RawPtr(p)); +} + +TEST(RawPtrTest, NullValuedRawPointer) { + int* p = nullptr; + EXPECT_EQ(nullptr, absl::RawPtr(p)); +} + +TEST(RawPtrTest, NullValuedSmartPointer) { + std::unique_ptr<int> p; + EXPECT_EQ(nullptr, absl::RawPtr(p)); +} + +TEST(RawPtrTest, Nullptr) { + auto p = absl::RawPtr(nullptr); + EXPECT_TRUE((std::is_same<std::nullptr_t, decltype(p)>::value)); + EXPECT_EQ(nullptr, p); +} + +TEST(RawPtrTest, Null) { + auto p = absl::RawPtr(nullptr); + EXPECT_TRUE((std::is_same<std::nullptr_t, decltype(p)>::value)); + EXPECT_EQ(nullptr, p); +} + +TEST(RawPtrTest, Zero) { + auto p = absl::RawPtr(nullptr); + EXPECT_TRUE((std::is_same<std::nullptr_t, decltype(p)>::value)); + EXPECT_EQ(nullptr, p); +} + +TEST(ShareUniquePtrTest, Share) { + auto up = absl::make_unique<int>(); + int* rp = up.get(); + auto sp = absl::ShareUniquePtr(std::move(up)); + EXPECT_EQ(sp.get(), rp); +} + +TEST(ShareUniquePtrTest, ShareNull) { + struct NeverDie { + using pointer = void*; + void operator()(pointer) { + ASSERT_TRUE(false) << "Deleter should not have been called."; + } + }; + + std::unique_ptr<void, NeverDie> up; + auto sp = absl::ShareUniquePtr(std::move(up)); +} + +TEST(WeakenPtrTest, Weak) { + auto sp = std::make_shared<int>(); + auto wp = absl::WeakenPtr(sp); + EXPECT_EQ(sp.get(), wp.lock().get()); + sp.reset(); + EXPECT_TRUE(wp.expired()); +} + +// Should not compile. +/* +TEST(RawPtrTest, NotAPointer) { + absl::RawPtr(1.5); +} +*/ + +template <typename T> +struct SmartPointer { + using difference_type = char; +}; + +struct PointerWith { + using element_type = int32_t; + using difference_type = int16_t; + template <typename U> + using rebind = SmartPointer<U>; + + static PointerWith pointer_to( + element_type& r) { // NOLINT(runtime/references) + return PointerWith{&r}; + } + + element_type* ptr; +}; + +template <typename... Args> +struct PointerWithout {}; + +TEST(PointerTraits, Types) { + using TraitsWith = absl::pointer_traits<PointerWith>; + EXPECT_TRUE((std::is_same<TraitsWith::pointer, PointerWith>::value)); + EXPECT_TRUE((std::is_same<TraitsWith::element_type, int32_t>::value)); + EXPECT_TRUE((std::is_same<TraitsWith::difference_type, int16_t>::value)); + EXPECT_TRUE(( + std::is_same<TraitsWith::rebind<int64_t>, SmartPointer<int64_t>>::value)); + + using TraitsWithout = absl::pointer_traits<PointerWithout<double, int>>; + EXPECT_TRUE((std::is_same<TraitsWithout::pointer, + PointerWithout<double, int>>::value)); + EXPECT_TRUE((std::is_same<TraitsWithout::element_type, double>::value)); + EXPECT_TRUE( + (std::is_same<TraitsWithout ::difference_type, std::ptrdiff_t>::value)); + EXPECT_TRUE((std::is_same<TraitsWithout::rebind<int64_t>, + PointerWithout<int64_t, int>>::value)); + + using TraitsRawPtr = absl::pointer_traits<char*>; + EXPECT_TRUE((std::is_same<TraitsRawPtr::pointer, char*>::value)); + EXPECT_TRUE((std::is_same<TraitsRawPtr::element_type, char>::value)); + EXPECT_TRUE( + (std::is_same<TraitsRawPtr::difference_type, std::ptrdiff_t>::value)); + EXPECT_TRUE((std::is_same<TraitsRawPtr::rebind<int64_t>, int64_t*>::value)); +} + +TEST(PointerTraits, Functions) { + int i; + EXPECT_EQ(&i, absl::pointer_traits<PointerWith>::pointer_to(i).ptr); + EXPECT_EQ(&i, absl::pointer_traits<int*>::pointer_to(i)); +} + +TEST(AllocatorTraits, Typedefs) { + struct A { + struct value_type {}; + }; + EXPECT_TRUE(( + std::is_same<A, + typename absl::allocator_traits<A>::allocator_type>::value)); + EXPECT_TRUE( + (std::is_same<A::value_type, + typename absl::allocator_traits<A>::value_type>::value)); + + struct X {}; + struct HasPointer { + using value_type = X; + using pointer = SmartPointer<X>; + }; + EXPECT_TRUE((std::is_same<SmartPointer<X>, typename absl::allocator_traits< + HasPointer>::pointer>::value)); + EXPECT_TRUE( + (std::is_same<A::value_type*, + typename absl::allocator_traits<A>::pointer>::value)); + + EXPECT_TRUE( + (std::is_same< + SmartPointer<const X>, + typename absl::allocator_traits<HasPointer>::const_pointer>::value)); + EXPECT_TRUE( + (std::is_same<const A::value_type*, + typename absl::allocator_traits<A>::const_pointer>::value)); + + struct HasVoidPointer { + using value_type = X; + struct void_pointer {}; + }; + + EXPECT_TRUE((std::is_same<HasVoidPointer::void_pointer, + typename absl::allocator_traits< + HasVoidPointer>::void_pointer>::value)); + EXPECT_TRUE( + (std::is_same<SmartPointer<void>, typename absl::allocator_traits< + HasPointer>::void_pointer>::value)); + + struct HasConstVoidPointer { + using value_type = X; + struct const_void_pointer {}; + }; + + EXPECT_TRUE( + (std::is_same<HasConstVoidPointer::const_void_pointer, + typename absl::allocator_traits< + HasConstVoidPointer>::const_void_pointer>::value)); + EXPECT_TRUE((std::is_same<SmartPointer<const void>, + typename absl::allocator_traits< + HasPointer>::const_void_pointer>::value)); + + struct HasDifferenceType { + using value_type = X; + using difference_type = int; + }; + EXPECT_TRUE( + (std::is_same<int, typename absl::allocator_traits< + HasDifferenceType>::difference_type>::value)); + EXPECT_TRUE((std::is_same<char, typename absl::allocator_traits< + HasPointer>::difference_type>::value)); + + struct HasSizeType { + using value_type = X; + using size_type = unsigned int; + }; + EXPECT_TRUE((std::is_same<unsigned int, typename absl::allocator_traits< + HasSizeType>::size_type>::value)); + EXPECT_TRUE((std::is_same<unsigned char, typename absl::allocator_traits< + HasPointer>::size_type>::value)); + + struct HasPropagateOnCopy { + using value_type = X; + struct propagate_on_container_copy_assignment {}; + }; + + EXPECT_TRUE( + (std::is_same<HasPropagateOnCopy::propagate_on_container_copy_assignment, + typename absl::allocator_traits<HasPropagateOnCopy>:: + propagate_on_container_copy_assignment>::value)); + EXPECT_TRUE( + (std::is_same<std::false_type, + typename absl::allocator_traits< + A>::propagate_on_container_copy_assignment>::value)); + + struct HasPropagateOnMove { + using value_type = X; + struct propagate_on_container_move_assignment {}; + }; + + EXPECT_TRUE( + (std::is_same<HasPropagateOnMove::propagate_on_container_move_assignment, + typename absl::allocator_traits<HasPropagateOnMove>:: + propagate_on_container_move_assignment>::value)); + EXPECT_TRUE( + (std::is_same<std::false_type, + typename absl::allocator_traits< + A>::propagate_on_container_move_assignment>::value)); + + struct HasPropagateOnSwap { + using value_type = X; + struct propagate_on_container_swap {}; + }; + + EXPECT_TRUE( + (std::is_same<HasPropagateOnSwap::propagate_on_container_swap, + typename absl::allocator_traits<HasPropagateOnSwap>:: + propagate_on_container_swap>::value)); + EXPECT_TRUE( + (std::is_same<std::false_type, typename absl::allocator_traits<A>:: + propagate_on_container_swap>::value)); + + struct HasIsAlwaysEqual { + using value_type = X; + struct is_always_equal {}; + }; + + EXPECT_TRUE((std::is_same<HasIsAlwaysEqual::is_always_equal, + typename absl::allocator_traits< + HasIsAlwaysEqual>::is_always_equal>::value)); + EXPECT_TRUE((std::is_same<std::true_type, typename absl::allocator_traits< + A>::is_always_equal>::value)); + struct NonEmpty { + using value_type = X; + int i; + }; + EXPECT_TRUE( + (std::is_same<std::false_type, + absl::allocator_traits<NonEmpty>::is_always_equal>::value)); +} + +template <typename T> +struct Rebound {}; + +struct AllocWithRebind { + using value_type = int; + template <typename T> + struct rebind { + using other = Rebound<T>; + }; +}; + +template <typename T, typename U> +struct AllocWithoutRebind { + using value_type = int; +}; + +TEST(AllocatorTraits, Rebind) { + EXPECT_TRUE( + (std::is_same<Rebound<int>, + typename absl::allocator_traits< + AllocWithRebind>::template rebind_alloc<int>>::value)); + EXPECT_TRUE( + (std::is_same<absl::allocator_traits<Rebound<int>>, + typename absl::allocator_traits< + AllocWithRebind>::template rebind_traits<int>>::value)); + + EXPECT_TRUE( + (std::is_same<AllocWithoutRebind<double, char>, + typename absl::allocator_traits<AllocWithoutRebind< + int, char>>::template rebind_alloc<double>>::value)); + EXPECT_TRUE( + (std::is_same<absl::allocator_traits<AllocWithoutRebind<double, char>>, + typename absl::allocator_traits<AllocWithoutRebind< + int, char>>::template rebind_traits<double>>::value)); +} + +struct TestValue { + TestValue() {} + explicit TestValue(int* trace) : trace(trace) { ++*trace; } + ~TestValue() { + if (trace) --*trace; + } + int* trace = nullptr; +}; + +struct MinimalMockAllocator { + MinimalMockAllocator() : value(0) {} + explicit MinimalMockAllocator(int value) : value(value) {} + MinimalMockAllocator(const MinimalMockAllocator& other) + : value(other.value) {} + using value_type = TestValue; + MOCK_METHOD1(allocate, value_type*(size_t)); + MOCK_METHOD2(deallocate, void(value_type*, size_t)); + + int value; +}; + +TEST(AllocatorTraits, FunctionsMinimal) { + int trace = 0; + int hint; + TestValue x(&trace); + MinimalMockAllocator mock; + using Traits = absl::allocator_traits<MinimalMockAllocator>; + EXPECT_CALL(mock, allocate(7)).WillRepeatedly(Return(&x)); + EXPECT_CALL(mock, deallocate(&x, 7)); + + EXPECT_EQ(&x, Traits::allocate(mock, 7)); + Traits::allocate(mock, 7, static_cast<const void*>(&hint)); + EXPECT_EQ(&x, Traits::allocate(mock, 7, static_cast<const void*>(&hint))); + Traits::deallocate(mock, &x, 7); + + EXPECT_EQ(1, trace); + Traits::construct(mock, &x, &trace); + EXPECT_EQ(2, trace); + Traits::destroy(mock, &x); + EXPECT_EQ(1, trace); + + EXPECT_EQ(std::numeric_limits<size_t>::max() / sizeof(TestValue), + Traits::max_size(mock)); + + EXPECT_EQ(0, mock.value); + EXPECT_EQ(0, Traits::select_on_container_copy_construction(mock).value); +} + +struct FullMockAllocator { + FullMockAllocator() : value(0) {} + explicit FullMockAllocator(int value) : value(value) {} + FullMockAllocator(const FullMockAllocator& other) : value(other.value) {} + using value_type = TestValue; + MOCK_METHOD1(allocate, value_type*(size_t)); + MOCK_METHOD2(allocate, value_type*(size_t, const void*)); + MOCK_METHOD2(construct, void(value_type*, int*)); + MOCK_METHOD1(destroy, void(value_type*)); + MOCK_CONST_METHOD0(max_size, size_t()); + MOCK_CONST_METHOD0(select_on_container_copy_construction, + FullMockAllocator()); + + int value; +}; + +TEST(AllocatorTraits, FunctionsFull) { + int trace = 0; + int hint; + TestValue x(&trace), y; + FullMockAllocator mock; + using Traits = absl::allocator_traits<FullMockAllocator>; + EXPECT_CALL(mock, allocate(7)).WillRepeatedly(Return(&x)); + EXPECT_CALL(mock, allocate(13, &hint)).WillRepeatedly(Return(&y)); + EXPECT_CALL(mock, construct(&x, &trace)); + EXPECT_CALL(mock, destroy(&x)); + EXPECT_CALL(mock, max_size()).WillRepeatedly(Return(17)); + EXPECT_CALL(mock, select_on_container_copy_construction()) + .WillRepeatedly(Return(FullMockAllocator(23))); + + EXPECT_EQ(&x, Traits::allocate(mock, 7)); + EXPECT_EQ(&y, Traits::allocate(mock, 13, static_cast<const void*>(&hint))); + + EXPECT_EQ(1, trace); + Traits::construct(mock, &x, &trace); + EXPECT_EQ(1, trace); + Traits::destroy(mock, &x); + EXPECT_EQ(1, trace); + + EXPECT_EQ(17, Traits::max_size(mock)); + + EXPECT_EQ(0, mock.value); + EXPECT_EQ(23, Traits::select_on_container_copy_construction(mock).value); +} + +TEST(AllocatorNoThrowTest, DefaultAllocator) { +#if ABSL_ALLOCATOR_NOTHROW + EXPECT_TRUE(absl::default_allocator_is_nothrow::value); +#else + EXPECT_FALSE(absl::default_allocator_is_nothrow::value); +#endif +} + +TEST(AllocatorNoThrowTest, StdAllocator) { +#if ABSL_ALLOCATOR_NOTHROW + EXPECT_TRUE(absl::allocator_is_nothrow<std::allocator<int>>::value); +#else + EXPECT_FALSE(absl::allocator_is_nothrow<std::allocator<int>>::value); +#endif +} + +TEST(AllocatorNoThrowTest, CustomAllocator) { + struct NoThrowAllocator { + using is_nothrow = std::true_type; + }; + struct CanThrowAllocator { + using is_nothrow = std::false_type; + }; + struct UnspecifiedAllocator { + }; + EXPECT_TRUE(absl::allocator_is_nothrow<NoThrowAllocator>::value); + EXPECT_FALSE(absl::allocator_is_nothrow<CanThrowAllocator>::value); + EXPECT_FALSE(absl::allocator_is_nothrow<UnspecifiedAllocator>::value); +} + +} // namespace |