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Diffstat (limited to 'llvm/unittests/ADT/OptionalTest.cpp')
-rw-r--r-- | llvm/unittests/ADT/OptionalTest.cpp | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/llvm/unittests/ADT/OptionalTest.cpp b/llvm/unittests/ADT/OptionalTest.cpp index c7fa796..d40e212 100644 --- a/llvm/unittests/ADT/OptionalTest.cpp +++ b/llvm/unittests/ADT/OptionalTest.cpp @@ -8,6 +8,7 @@ #include "llvm/ADT/Optional.h" #include "llvm/ADT/SmallString.h" +#include "llvm/ADT/StringMap.h" #include "llvm/Support/raw_ostream.h" #include "gtest/gtest-spi.h" #include "gtest/gtest.h" @@ -390,6 +391,143 @@ TEST(OptionalTest, ImmovableEmplace) { EXPECT_EQ(0u, Immovable::Destructions); } +// Craft a class which is_trivially_copyable, but not +// is_trivially_copy_constructible. +struct NonTCopy { + NonTCopy() = default; + + // Delete the volatile copy constructor to engage the "rule of 3" and delete + // any unspecified copy assignment or constructor. + NonTCopy(volatile NonTCopy const &) = delete; + + // Leave the non-volatile default copy constructor unspecified (deleted by + // rule of 3) + + // This template can serve as the copy constructor, but isn't chosen + // by =default in a class with a 'NonTCopy' member. + template <typename Self = NonTCopy> + NonTCopy(Self const &Other) : Val(Other.Val) {} + + NonTCopy &operator=(NonTCopy const &) = default; + + int Val{0}; +}; + +#if defined(_MSC_VER) && _MSC_VER >= 1927 && !defined(__clang__) +// Currently only true on recent MSVC releases. +static_assert(std::is_trivially_copyable<NonTCopy>::value, + "Expect NonTCopy to be trivially copyable"); + +static_assert(!std::is_trivially_copy_constructible<NonTCopy>::value, + "Expect NonTCopy not to be trivially copy constructible."); +#endif // defined(_MSC_VER) && _MSC_VER >= 1927 + +TEST(OptionalTest, DeletedCopyConstructor) { + + // Expect compile to fail if 'trivial' version of + // optional_detail::OptionalStorage is chosen. + using NonTCopyOptT = Optional<NonTCopy>; + NonTCopyOptT NonTCopy1; + + // Check that the Optional can be copy constructed. + NonTCopyOptT NonTCopy2{NonTCopy1}; + + // Check that the Optional can be copy assigned. + NonTCopy1 = NonTCopy2; +} + +// Craft a class which is_trivially_copyable, but not +// is_trivially_copy_assignable. +class NonTAssign { +public: + NonTAssign() = default; + NonTAssign(NonTAssign const &) = default; + + // Delete the volatile copy assignment to engage the "rule of 3" and delete + // any unspecified copy assignment or constructor. + NonTAssign &operator=(volatile NonTAssign const &) = delete; + + // Leave the non-volatile default copy assignment unspecified (deleted by rule + // of 3). + + // This template can serve as the copy assignment, but isn't chosen + // by =default in a class with a 'NonTAssign' member. + template <typename Self = NonTAssign> + NonTAssign &operator=(Self const &Other) { + A = Other.A; + return *this; + } + + int A{0}; +}; + +#if defined(_MSC_VER) && _MSC_VER >= 1927 && !defined(__clang__) +// Currently only true on recent MSVC releases. +static_assert(std::is_trivially_copyable<NonTAssign>::value, + "Expect NonTAssign to be trivially copyable"); + +static_assert(!std::is_trivially_copy_assignable<NonTAssign>::value, + "Expect NonTAssign not to be trivially assignable."); +#endif // defined(_MSC_VER) && _MSC_VER >= 1927 + +TEST(OptionalTest, DeletedCopyAssignment) { + + // Expect compile to fail if 'trivial' version of + // optional_detail::OptionalStorage is chosen. + using NonTAssignOptT = Optional<NonTAssign>; + NonTAssignOptT NonTAssign1; + + // Check that the Optional can be copy constructed. + NonTAssignOptT NonTAssign2{NonTAssign1}; + + // Check that the Optional can be copy assigned. + NonTAssign1 = NonTAssign2; +} + +struct NoTMove { + NoTMove() = default; + NoTMove(NoTMove const &) = default; + NoTMove &operator=(NoTMove const &) = default; + + // Delete move constructor / assignment. Compiler should fall-back to the + // trivial copy constructor / assignment in the trivial OptionalStorage + // specialization. + NoTMove(NoTMove &&) = delete; + NoTMove &operator=(NoTMove &&) = delete; + + int Val{0}; +}; + +TEST(OptionalTest, DeletedMoveConstructor) { + using NoTMoveOptT = Optional<NoTMove>; + + NoTMoveOptT NonTMove1; + NoTMoveOptT NonTMove2{std::move(NonTMove1)}; + + NonTMove1 = std::move(NonTMove2); + + static_assert( + std::is_trivially_copyable<NoTMoveOptT>::value, + "Expect Optional<NoTMove> to still use the trivial specialization " + "of OptionalStorage despite the deleted move constructor / assignment."); +} + +class NoCopyStringMap { +public: + NoCopyStringMap() = default; + +private: + llvm::StringMap<std::unique_ptr<int>> Map; +}; + +TEST(OptionalTest, DeletedCopyStringMap) { + // Old versions of gcc (7.3 and prior) instantiate the copy constructor when + // std::is_trivially_copyable is instantiated. This test will fail + // compilation if std::is_trivially_copyable is used in the OptionalStorage + // specialization condition by gcc <= 7.3. + Optional<NoCopyStringMap> TestInstantiation; +} + #if LLVM_HAS_RVALUE_REFERENCE_THIS TEST(OptionalTest, MoveGetValueOr) { |