Fix std::pair on FreeBSD
Summary: FreeBSD ships an old ABI for std::pair which requires that it have non-trivial copy/move constructors. Currently the non-trivial copy/move is achieved by providing explicit definitions of the constructors. This is problematic because it means the constructors don't SFINAE properly. In order to SFINAE copy/move constructors they have to be explicitly defaulted and hense non-trivial. This patch attempts to provide SFINAE'ing copy/move constructors for std::pair while still making them non-trivial. It does this by adding a base class with a non-trivial copy constructor and then allowing pair's constructors to be generated by the compiler. This also allows the constructors to be constexpr. Reviewers: emaste, theraven, rsmith, dim Subscribers: cfe-commits Differential Revision: https://reviews.llvm.org/D25389 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@283944 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier
@@ -7,49 +7,142 @@
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//
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//===----------------------------------------------------------------------===//
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// The test fails due to the missing is_trivially_constructible intrinsic.
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// XFAIL: gcc-4.9
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// <utility>
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// template <class T1, class T2> struct pair
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// Test that we properly provide the old non-trivial copy operations
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// when the ABI macro is defined.
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// Test that we properly provide the trivial copy operations by default.
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// FreeBSD provides the old ABI. This test checks the new ABI so we need
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// to manually turn it on.
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#undef _LIBCPP_ABI_UNSTABLE
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#undef _LIBCPP_ABI_VERSION
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#define _LIBCPP_ABI_VERSION 1
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#define _LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR
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#include <utility>
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#include <type_traits>
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#include <cstdlib>
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#include <cassert>
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#include "test_macros.h"
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#if TEST_STD_VER >= 11
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struct Dummy {
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Dummy(Dummy const&) = delete;
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Dummy(Dummy &&) = default;
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};
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#if !defined(_LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR)
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#error trivial ctor ABI macro defined
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#endif
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template <class T>
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struct HasNonTrivialABI : std::integral_constant<bool,
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!std::is_trivially_destructible<T>::value
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|| (std::is_copy_constructible<T>::value && !std::is_trivially_copy_constructible<T>::value)
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#if TEST_STD_VER >= 11
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|| (std::is_move_constructible<T>::value && !std::is_trivially_move_constructible<T>::value)
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#endif
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> {};
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#if TEST_STD_VER >= 11
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struct NonTrivialDtor {
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NonTrivialDtor(NonTrivialDtor const&) = default;
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~NonTrivialDtor();
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};
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NonTrivialDtor::~NonTrivialDtor() {}
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static_assert(HasNonTrivialABI<NonTrivialDtor>::value, "");
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struct NonTrivialCopy {
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NonTrivialCopy(NonTrivialCopy const&);
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};
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NonTrivialCopy::NonTrivialCopy(NonTrivialCopy const&) {}
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static_assert(HasNonTrivialABI<NonTrivialCopy>::value, "");
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struct NonTrivialMove {
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NonTrivialMove(NonTrivialMove const&) = default;
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NonTrivialMove(NonTrivialMove&&);
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};
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NonTrivialMove::NonTrivialMove(NonTrivialMove&&) {}
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static_assert(HasNonTrivialABI<NonTrivialMove>::value, "");
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struct DeletedCopy {
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DeletedCopy(DeletedCopy const&) = delete;
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DeletedCopy(DeletedCopy&&) = default;
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};
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static_assert(!HasNonTrivialABI<DeletedCopy>::value, "");
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struct TrivialMove {
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TrivialMove(TrivialMove &&) = default;
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};
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static_assert(!HasNonTrivialABI<TrivialMove>::value, "");
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struct Trivial {
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Trivial(Trivial const&) = default;
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};
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static_assert(!HasNonTrivialABI<Trivial>::value, "");
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#endif
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int main()
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{
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typedef std::pair<int, short> P;
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{
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typedef std::pair<int, short> P;
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static_assert(std::is_copy_constructible<P>::value, "");
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static_assert(!std::is_trivially_copy_constructible<P>::value, "");
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static_assert(!std::is_trivially_copyable<P>::value, "");
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static_assert(HasNonTrivialABI<P>::value, "");
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}
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#if TEST_STD_VER >= 11
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{
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typedef std::pair<int, short> P;
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static_assert(std::is_move_constructible<P>::value, "");
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static_assert(!std::is_trivially_move_constructible<P>::value, "");
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static_assert(!std::is_trivially_copyable<P>::value, "");
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static_assert(HasNonTrivialABI<P>::value, "");
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}
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{
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using P1 = std::pair<Dummy, int>;
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// These lines fail because the non-trivial constructors do not provide
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// SFINAE.
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// static_assert(!std::is_copy_constructible<P1>::value, "");
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// static_assert(!std::is_trivially_copy_constructible<P1>::value, "");
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static_assert(std::is_move_constructible<P1>::value, "");
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static_assert(!std::is_trivially_move_constructible<P1>::value, "");
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static_assert(!std::is_trivially_copyable<P>::value, "");
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using P = std::pair<NonTrivialDtor, int>;
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static_assert(!std::is_trivially_destructible<P>::value, "");
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static_assert(std::is_copy_constructible<P>::value, "");
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static_assert(!std::is_trivially_copy_constructible<P>::value, "");
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static_assert(std::is_move_constructible<P>::value, "");
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static_assert(!std::is_trivially_move_constructible<P>::value, "");
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static_assert(HasNonTrivialABI<P>::value, "");
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}
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{
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using P = std::pair<NonTrivialCopy, int>;
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static_assert(std::is_copy_constructible<P>::value, "");
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static_assert(!std::is_trivially_copy_constructible<P>::value, "");
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static_assert(std::is_move_constructible<P>::value, "");
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static_assert(!std::is_trivially_move_constructible<P>::value, "");
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static_assert(HasNonTrivialABI<P>::value, "");
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}
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{
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using P = std::pair<NonTrivialMove, int>;
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static_assert(std::is_copy_constructible<P>::value, "");
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static_assert(!std::is_trivially_copy_constructible<P>::value, "");
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static_assert(std::is_move_constructible<P>::value, "");
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static_assert(!std::is_trivially_move_constructible<P>::value, "");
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static_assert(HasNonTrivialABI<P>::value, "");
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}
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{
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using P = std::pair<DeletedCopy, int>;
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static_assert(!std::is_copy_constructible<P>::value, "");
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static_assert(!std::is_trivially_copy_constructible<P>::value, "");
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static_assert(std::is_move_constructible<P>::value, "");
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static_assert(!std::is_trivially_move_constructible<P>::value, "");
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static_assert(HasNonTrivialABI<P>::value, "");
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}
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{
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using P = std::pair<Trivial, int>;
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static_assert(std::is_copy_constructible<P>::value, "");
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static_assert(!std::is_trivially_copy_constructible<P>::value, "");
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static_assert(std::is_move_constructible<P>::value, "");
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static_assert(!std::is_trivially_move_constructible<P>::value, "");
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static_assert(HasNonTrivialABI<P>::value, "");
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}
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{
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using P = std::pair<TrivialMove, int>;
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static_assert(!std::is_copy_constructible<P>::value, "");
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static_assert(!std::is_trivially_copy_constructible<P>::value, "");
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static_assert(std::is_move_constructible<P>::value, "");
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static_assert(!std::is_trivially_move_constructible<P>::value, "");
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static_assert(HasNonTrivialABI<P>::value, "");
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}
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#endif
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}
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