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/**
* Copyright (C) 2021-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/util/aligned.h"
#include <utility>
#include "mongo/base/static_assert.h"
#include "mongo/unittest/unittest.h"
namespace mongo {
namespace {
struct MoveOnly {
static constexpr int kEmpty = -1;
MoveOnly() = default;
explicit MoveOnly(int val) : val(val) {}
MoveOnly(const MoveOnly&) = delete;
MoveOnly& operator=(const MoveOnly& that) = delete;
MoveOnly(MoveOnly&& that) : val{std::exchange(that.val, kEmpty)} {}
MoveOnly& operator=(MoveOnly&& that) {
val = std::exchange(that.val, kEmpty);
return *this;
}
int val = 12345;
};
struct Final final {};
MONGO_STATIC_ASSERT(alignof(Aligned<Final, 1>) == 1);
MONGO_STATIC_ASSERT(alignof(Aligned<char, 1>) == 1);
MONGO_STATIC_ASSERT(alignof(Aligned<char, 2>) == 2);
MONGO_STATIC_ASSERT(alignof(Aligned<char, 4>) == 4);
MONGO_STATIC_ASSERT(alignof(Aligned<char, 8>) == 8);
MONGO_STATIC_ASSERT(alignof(Aligned<char, 16>) == 16);
MONGO_STATIC_ASSERT(alignof(Aligned<char, 32>) == 32);
MONGO_STATIC_ASSERT(alignof(Aligned<uint64_t, 8>) == 8);
MONGO_STATIC_ASSERT(alignof(Aligned<uint64_t, 16>) == 16);
MONGO_STATIC_ASSERT(alignof(Aligned<uint64_t, 32>) == 32);
TEST(Aligned, ConstructorForwarding) {
struct NeedsArg {
explicit NeedsArg(int v) : v(v) {}
int v;
};
Aligned<NeedsArg, sizeof(NeedsArg)> a{123};
ASSERT_EQ(a->v, 123);
};
TEST(Aligned, MoveConstruct) {
Aligned<MoveOnly, sizeof(MoveOnly)> m1{1};
Aligned<MoveOnly, sizeof(MoveOnly)> m2{std::move(m1)};
ASSERT_EQ(m1->val, MoveOnly::kEmpty); // NOLINT(bugprone-use-after-move)
ASSERT_EQ(m2->val, 1);
}
TEST(Aligned, MoveAssign) {
Aligned<MoveOnly, sizeof(MoveOnly)> m1{111};
Aligned<MoveOnly, sizeof(MoveOnly)> m2{222};
auto&& ret = (m2 = std::move(m1));
ASSERT(&ret == &m2);
ASSERT_EQ(m1->val, MoveOnly::kEmpty); // NOLINT(bugprone-use-after-move)
ASSERT_EQ(m2->val, 111);
}
TEST(Aligned, Swap) {
Aligned<MoveOnly, sizeof(MoveOnly)> m1{111};
Aligned<MoveOnly, sizeof(MoveOnly)> m2{222};
using std::swap;
swap(m1, m2);
ASSERT_EQ(m1->val, 222);
ASSERT_EQ(m2->val, 111);
}
TEST(CacheExclusive, IsAlignedToPlatformCacheLine) {
static constexpr size_t a = stdx::hardware_destructive_interference_size;
MONGO_STATIC_ASSERT(alignof(CacheExclusive<char>) == a);
MONGO_STATIC_ASSERT(alignof(CacheExclusive<char>) == a);
}
} // namespace
} // namespace mongo
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