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llvm-project/libcxx/test/std/utilities/variant/variant.variant/variant.assign/move.pass.cpp
JF Bastien 2df59c5068 Support tests in freestanding 
Summary:
Freestanding is *weird*. The standard allows it to differ in a bunch of odd
manners from regular C++, and the committee would like to improve that
situation. I'd like to make libc++ behave better with what freestanding should
be, so that it can be a tool we use in improving the standard. To do that we
need to try stuff out, both with "freestanding the language mode" and
"freestanding the library subset".

Let's start with the super basic: run the libc++ tests in freestanding, using
clang as the compiler, and see what works. The easiest hack to do this:

In utils/libcxx/test/config.py add:

  self.cxx.compile_flags += ['-ffreestanding']

Run the tests and they all fail.

Why? Because in freestanding `main` isn't special. This "not special" property
has two effects: main doesn't get mangled, and main isn't allowed to omit its
`return` statement. The first means main gets mangled and the linker can't
create a valid executable for us to test. The second means we spew out warnings
(ew) and the compiler doesn't insert the `return` we omitted, and main just
falls of the end and does whatever undefined behavior (if you're luck, ud2
leading to non-zero return code).

Let's start my work with the basics. This patch changes all libc++ tests to
declare `main` as `int main(int, char**` so it mangles consistently (enabling us
to declare another `extern "C"` main for freestanding which calls the mangled
one), and adds `return 0;` to all places where it was missing. This touches 6124
files, and I apologize.

The former was done with The Magic Of Sed.

The later was done with a (not quite correct but decent) clang tool:

  https://gist.github.com/jfbastien/793819ff360baa845483dde81170feed

This works for most tests, though I did have to adjust a few places when e.g.
the test runs with `-x c`, macros are used for main (such as for the filesystem
tests), etc.

Once this is in we can create a freestanding bot which will prevent further
regressions. After that, we can start the real work of supporting C++
freestanding fairly well in libc++.

<rdar://problem/47754795>

Reviewers: ldionne, mclow.lists, EricWF

Subscribers: christof, jkorous, dexonsmith, arphaman, miyuki, libcxx-commits

Differential Revision: https://reviews.llvm.org/D57624

llvm-svn: 353086
2019-02-04 20:31:13 +00:00

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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14
// The following compilers don't generate constexpr special members correctly.
// XFAIL: clang-3.5, clang-3.6, clang-3.7, clang-3.8
// XFAIL: apple-clang-6, apple-clang-7, apple-clang-8.0
// XFAIL: availability=macosx10.13
// XFAIL: availability=macosx10.12
// XFAIL: availability=macosx10.11
// XFAIL: availability=macosx10.10
// XFAIL: availability=macosx10.9
// XFAIL: availability=macosx10.8
// XFAIL: availability=macosx10.7
// <variant>
// template <class ...Types> class variant;
// variant& operator=(variant&&) noexcept(see below); // constexpr in C++20
#include <cassert>
#include <string>
#include <type_traits>
#include <utility>
#include <variant>
#include "test_macros.h"
#include "variant_test_helpers.hpp"
struct NoCopy {
NoCopy(const NoCopy &) = delete;
NoCopy &operator=(const NoCopy &) = default;
};
struct CopyOnly {
CopyOnly(const CopyOnly &) = default;
CopyOnly(CopyOnly &&) = delete;
CopyOnly &operator=(const CopyOnly &) = default;
CopyOnly &operator=(CopyOnly &&) = delete;
};
struct MoveOnly {
MoveOnly(const MoveOnly &) = delete;
MoveOnly(MoveOnly &&) = default;
MoveOnly &operator=(const MoveOnly &) = delete;
MoveOnly &operator=(MoveOnly &&) = default;
};
struct MoveOnlyNT {
MoveOnlyNT(const MoveOnlyNT &) = delete;
MoveOnlyNT(MoveOnlyNT &&) {}
MoveOnlyNT &operator=(const MoveOnlyNT &) = delete;
MoveOnlyNT &operator=(MoveOnlyNT &&) = default;
};
struct MoveOnlyOddNothrow {
MoveOnlyOddNothrow(MoveOnlyOddNothrow &&) noexcept(false) {}
MoveOnlyOddNothrow(const MoveOnlyOddNothrow &) = delete;
MoveOnlyOddNothrow &operator=(MoveOnlyOddNothrow &&) noexcept = default;
MoveOnlyOddNothrow &operator=(const MoveOnlyOddNothrow &) = delete;
};
struct MoveAssignOnly {
MoveAssignOnly(MoveAssignOnly &&) = delete;
MoveAssignOnly &operator=(MoveAssignOnly &&) = default;
};
struct MoveAssign {
static int move_construct;
static int move_assign;
static void reset() { move_construct = move_assign = 0; }
MoveAssign(int v) : value(v) {}
MoveAssign(MoveAssign &&o) : value(o.value) {
++move_construct;
o.value = -1;
}
MoveAssign &operator=(MoveAssign &&o) {
value = o.value;
++move_assign;
o.value = -1;
return *this;
}
int value;
};
int MoveAssign::move_construct = 0;
int MoveAssign::move_assign = 0;
struct NTMoveAssign {
constexpr NTMoveAssign(int v) : value(v) {}
NTMoveAssign(const NTMoveAssign &) = default;
NTMoveAssign(NTMoveAssign &&) = default;
NTMoveAssign &operator=(const NTMoveAssign &that) = default;
NTMoveAssign &operator=(NTMoveAssign &&that) {
value = that.value;
that.value = -1;
return *this;
};
int value;
};
static_assert(!std::is_trivially_move_assignable<NTMoveAssign>::value, "");
static_assert(std::is_move_assignable<NTMoveAssign>::value, "");
struct TMoveAssign {
constexpr TMoveAssign(int v) : value(v) {}
TMoveAssign(const TMoveAssign &) = delete;
TMoveAssign(TMoveAssign &&) = default;
TMoveAssign &operator=(const TMoveAssign &) = delete;
TMoveAssign &operator=(TMoveAssign &&) = default;
int value;
};
static_assert(std::is_trivially_move_assignable<TMoveAssign>::value, "");
struct TMoveAssignNTCopyAssign {
constexpr TMoveAssignNTCopyAssign(int v) : value(v) {}
TMoveAssignNTCopyAssign(const TMoveAssignNTCopyAssign &) = default;
TMoveAssignNTCopyAssign(TMoveAssignNTCopyAssign &&) = default;
TMoveAssignNTCopyAssign &operator=(const TMoveAssignNTCopyAssign &that) {
value = that.value;
return *this;
}
TMoveAssignNTCopyAssign &operator=(TMoveAssignNTCopyAssign &&) = default;
int value;
};
static_assert(std::is_trivially_move_assignable_v<TMoveAssignNTCopyAssign>, "");
struct TrivialCopyNontrivialMove {
TrivialCopyNontrivialMove(TrivialCopyNontrivialMove const&) = default;
TrivialCopyNontrivialMove(TrivialCopyNontrivialMove&&) noexcept {}
TrivialCopyNontrivialMove& operator=(TrivialCopyNontrivialMove const&) = default;
TrivialCopyNontrivialMove& operator=(TrivialCopyNontrivialMove&&) noexcept {
return *this;
}
};
static_assert(std::is_trivially_copy_assignable_v<TrivialCopyNontrivialMove>, "");
static_assert(!std::is_trivially_move_assignable_v<TrivialCopyNontrivialMove>, "");
void test_move_assignment_noexcept() {
{
using V = std::variant<int>;
static_assert(std::is_nothrow_move_assignable<V>::value, "");
}
{
using V = std::variant<MoveOnly>;
static_assert(std::is_nothrow_move_assignable<V>::value, "");
}
{
using V = std::variant<int, long>;
static_assert(std::is_nothrow_move_assignable<V>::value, "");
}
{
using V = std::variant<int, MoveOnly>;
static_assert(std::is_nothrow_move_assignable<V>::value, "");
}
{
using V = std::variant<MoveOnlyNT>;
static_assert(!std::is_nothrow_move_assignable<V>::value, "");
}
{
using V = std::variant<MoveOnlyOddNothrow>;
static_assert(!std::is_nothrow_move_assignable<V>::value, "");
}
}
void test_move_assignment_sfinae() {
{
using V = std::variant<int, long>;
static_assert(std::is_move_assignable<V>::value, "");
}
{
using V = std::variant<int, CopyOnly>;
static_assert(std::is_move_assignable<V>::value, "");
}
{
using V = std::variant<int, NoCopy>;
static_assert(!std::is_move_assignable<V>::value, "");
}
{
using V = std::variant<int, MoveOnly>;
static_assert(std::is_move_assignable<V>::value, "");
}
{
using V = std::variant<int, MoveOnlyNT>;
static_assert(std::is_move_assignable<V>::value, "");
}
{
// variant only provides move assignment when the types also provide
// a move constructor.
using V = std::variant<int, MoveAssignOnly>;
static_assert(!std::is_move_assignable<V>::value, "");
}
// Make sure we properly propagate triviality (see P0602R4).
#if TEST_STD_VER > 17
{
using V = std::variant<int, long>;
static_assert(std::is_trivially_move_assignable<V>::value, "");
}
{
using V = std::variant<int, NTMoveAssign>;
static_assert(!std::is_trivially_move_assignable<V>::value, "");
static_assert(std::is_move_assignable<V>::value, "");
}
{
using V = std::variant<int, TMoveAssign>;
static_assert(std::is_trivially_move_assignable<V>::value, "");
}
{
using V = std::variant<int, TMoveAssignNTCopyAssign>;
static_assert(std::is_trivially_move_assignable<V>::value, "");
}
{
using V = std::variant<int, TrivialCopyNontrivialMove>;
static_assert(!std::is_trivially_move_assignable<V>::value, "");
}
{
using V = std::variant<int, CopyOnly>;
static_assert(std::is_trivially_move_assignable<V>::value, "");
}
#endif // > C++17
}
void test_move_assignment_empty_empty() {
#ifndef TEST_HAS_NO_EXCEPTIONS
using MET = MakeEmptyT;
{
using V = std::variant<int, long, MET>;
V v1(std::in_place_index<0>);
makeEmpty(v1);
V v2(std::in_place_index<0>);
makeEmpty(v2);
V &vref = (v1 = std::move(v2));
assert(&vref == &v1);
assert(v1.valueless_by_exception());
assert(v1.index() == std::variant_npos);
}
#endif // TEST_HAS_NO_EXCEPTIONS
}
void test_move_assignment_non_empty_empty() {
#ifndef TEST_HAS_NO_EXCEPTIONS
using MET = MakeEmptyT;
{
using V = std::variant<int, MET>;
V v1(std::in_place_index<0>, 42);
V v2(std::in_place_index<0>);
makeEmpty(v2);
V &vref = (v1 = std::move(v2));
assert(&vref == &v1);
assert(v1.valueless_by_exception());
assert(v1.index() == std::variant_npos);
}
{
using V = std::variant<int, MET, std::string>;
V v1(std::in_place_index<2>, "hello");
V v2(std::in_place_index<0>);
makeEmpty(v2);
V &vref = (v1 = std::move(v2));
assert(&vref == &v1);
assert(v1.valueless_by_exception());
assert(v1.index() == std::variant_npos);
}
#endif // TEST_HAS_NO_EXCEPTIONS
}
void test_move_assignment_empty_non_empty() {
#ifndef TEST_HAS_NO_EXCEPTIONS
using MET = MakeEmptyT;
{
using V = std::variant<int, MET>;
V v1(std::in_place_index<0>);
makeEmpty(v1);
V v2(std::in_place_index<0>, 42);
V &vref = (v1 = std::move(v2));
assert(&vref == &v1);
assert(v1.index() == 0);
assert(std::get<0>(v1) == 42);
}
{
using V = std::variant<int, MET, std::string>;
V v1(std::in_place_index<0>);
makeEmpty(v1);
V v2(std::in_place_type<std::string>, "hello");
V &vref = (v1 = std::move(v2));
assert(&vref == &v1);
assert(v1.index() == 2);
assert(std::get<2>(v1) == "hello");
}
#endif // TEST_HAS_NO_EXCEPTIONS
}
template <typename T> struct Result { size_t index; T value; };
void test_move_assignment_same_index() {
{
using V = std::variant<int>;
V v1(43);
V v2(42);
V &vref = (v1 = std::move(v2));
assert(&vref == &v1);
assert(v1.index() == 0);
assert(std::get<0>(v1) == 42);
}
{
using V = std::variant<int, long, unsigned>;
V v1(43l);
V v2(42l);
V &vref = (v1 = std::move(v2));
assert(&vref == &v1);
assert(v1.index() == 1);
assert(std::get<1>(v1) == 42);
}
{
using V = std::variant<int, MoveAssign, unsigned>;
V v1(std::in_place_type<MoveAssign>, 43);
V v2(std::in_place_type<MoveAssign>, 42);
MoveAssign::reset();
V &vref = (v1 = std::move(v2));
assert(&vref == &v1);
assert(v1.index() == 1);
assert(std::get<1>(v1).value == 42);
assert(MoveAssign::move_construct == 0);
assert(MoveAssign::move_assign == 1);
}
#ifndef TEST_HAS_NO_EXCEPTIONS
using MET = MakeEmptyT;
{
using V = std::variant<int, MET, std::string>;
V v1(std::in_place_type<MET>);
MET &mref = std::get<1>(v1);
V v2(std::in_place_type<MET>);
try {
v1 = std::move(v2);
assert(false);
} catch (...) {
}
assert(v1.index() == 1);
assert(&std::get<1>(v1) == &mref);
}
#endif // TEST_HAS_NO_EXCEPTIONS
// Make sure we properly propagate triviality, which implies constexpr-ness (see P0602R4).
#if TEST_STD_VER > 17
{
struct {
constexpr Result<int> operator()() const {
using V = std::variant<int>;
V v(43);
V v2(42);
v = std::move(v2);
return {v.index(), std::get<0>(v)};
}
} test;
constexpr auto result = test();
static_assert(result.index == 0, "");
static_assert(result.value == 42, "");
}
{
struct {
constexpr Result<long> operator()() const {
using V = std::variant<int, long, unsigned>;
V v(43l);
V v2(42l);
v = std::move(v2);
return {v.index(), std::get<1>(v)};
}
} test;
constexpr auto result = test();
static_assert(result.index == 1, "");
static_assert(result.value == 42l, "");
}
{
struct {
constexpr Result<int> operator()() const {
using V = std::variant<int, TMoveAssign, unsigned>;
V v(std::in_place_type<TMoveAssign>, 43);
V v2(std::in_place_type<TMoveAssign>, 42);
v = std::move(v2);
return {v.index(), std::get<1>(v).value};
}
} test;
constexpr auto result = test();
static_assert(result.index == 1, "");
static_assert(result.value == 42, "");
}
#endif // > C++17
}
void test_move_assignment_different_index() {
{
using V = std::variant<int, long, unsigned>;
V v1(43);
V v2(42l);
V &vref = (v1 = std::move(v2));
assert(&vref == &v1);
assert(v1.index() == 1);
assert(std::get<1>(v1) == 42);
}
{
using V = std::variant<int, MoveAssign, unsigned>;
V v1(std::in_place_type<unsigned>, 43);
V v2(std::in_place_type<MoveAssign>, 42);
MoveAssign::reset();
V &vref = (v1 = std::move(v2));
assert(&vref == &v1);
assert(v1.index() == 1);
assert(std::get<1>(v1).value == 42);
assert(MoveAssign::move_construct == 1);
assert(MoveAssign::move_assign == 0);
}
#ifndef TEST_HAS_NO_EXCEPTIONS
using MET = MakeEmptyT;
{
using V = std::variant<int, MET, std::string>;
V v1(std::in_place_type<int>);
V v2(std::in_place_type<MET>);
try {
v1 = std::move(v2);
assert(false);
} catch (...) {
}
assert(v1.valueless_by_exception());
assert(v1.index() == std::variant_npos);
}
{
using V = std::variant<int, MET, std::string>;
V v1(std::in_place_type<MET>);
V v2(std::in_place_type<std::string>, "hello");
V &vref = (v1 = std::move(v2));
assert(&vref == &v1);
assert(v1.index() == 2);
assert(std::get<2>(v1) == "hello");
}
#endif // TEST_HAS_NO_EXCEPTIONS
// Make sure we properly propagate triviality, which implies constexpr-ness (see P0602R4).
#if TEST_STD_VER > 17
{
struct {
constexpr Result<long> operator()() const {
using V = std::variant<int, long, unsigned>;
V v(43);
V v2(42l);
v = std::move(v2);
return {v.index(), std::get<1>(v)};
}
} test;
constexpr auto result = test();
static_assert(result.index == 1, "");
static_assert(result.value == 42l, "");
}
{
struct {
constexpr Result<long> operator()() const {
using V = std::variant<int, TMoveAssign, unsigned>;
V v(std::in_place_type<unsigned>, 43);
V v2(std::in_place_type<TMoveAssign>, 42);
v = std::move(v2);
return {v.index(), std::get<1>(v).value};
}
} test;
constexpr auto result = test();
static_assert(result.index == 1, "");
static_assert(result.value == 42, "");
}
#endif // > C++17
}
template <size_t NewIdx, class ValueType>
constexpr bool test_constexpr_assign_imp(
std::variant<long, void*, int>&& v, ValueType&& new_value)
{
std::variant<long, void*, int> v2(
std::forward<ValueType>(new_value));
const auto cp = v2;
v = std::move(v2);
return v.index() == NewIdx &&
std::get<NewIdx>(v) == std::get<NewIdx>(cp);
}
void test_constexpr_move_assignment() {
// Make sure we properly propagate triviality, which implies constexpr-ness (see P0602R4).
#if TEST_STD_VER > 17
using V = std::variant<long, void*, int>;
static_assert(std::is_trivially_copyable<V>::value, "");
static_assert(std::is_trivially_move_assignable<V>::value, "");
static_assert(test_constexpr_assign_imp<0>(V(42l), 101l), "");
static_assert(test_constexpr_assign_imp<0>(V(nullptr), 101l), "");
static_assert(test_constexpr_assign_imp<1>(V(42l), nullptr), "");
static_assert(test_constexpr_assign_imp<2>(V(42l), 101), "");
#endif // > C++17
}
int main(int, char**) {
test_move_assignment_empty_empty();
test_move_assignment_non_empty_empty();
test_move_assignment_empty_non_empty();
test_move_assignment_same_index();
test_move_assignment_different_index();
test_move_assignment_sfinae();
test_move_assignment_noexcept();
test_constexpr_move_assignment();
return 0;
}
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