polardbxengine/unittest/gunit/temptable/allocator-t.cc

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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */

#include <gtest/gtest.h>
#include <array>
#include <cstring>
#include <memory>
#include <vector>

#include "allocator_helper.h"
#include "storage/temptable/include/temptable/allocator.h"
#include "storage/temptable/src/allocator.cc"

namespace temptable_test {

/* TestItem class. */

class TestItem {
 public:
  explicit TestItem();

  TestItem(int first, int second);

  ~TestItem();

  int get_first() const;

  int get_second() const;

  static void reset_counters();

  static int get_default_constructor_call_count();

  static int get_parametrized_constructor_call_count();

  static int get_destructor_call_count();

 private:
  int m_first;

  int m_second;

  static int s_default_constructor_call_count;

  static int s_parametrized_constructor_call_count;

  static int s_destructor_call_count;
};

TestItem::TestItem() : m_first(0), m_second(0) {
  ++s_default_constructor_call_count;
}

TestItem::TestItem(int first, int second) : m_first(first), m_second(second) {
  ++s_parametrized_constructor_call_count;
}

TestItem::~TestItem() { ++s_destructor_call_count; }

int TestItem::get_first() const { return m_first; }

int TestItem::get_second() const { return m_second; }

void TestItem::reset_counters() {
  s_default_constructor_call_count = 0;
  s_parametrized_constructor_call_count = 0;
  s_destructor_call_count = 0;
}

int TestItem::get_default_constructor_call_count() {
  return s_default_constructor_call_count;
}

int TestItem::get_parametrized_constructor_call_count() {
  return s_parametrized_constructor_call_count;
}

int TestItem::get_destructor_call_count() { return s_destructor_call_count; }

int TestItem::s_default_constructor_call_count = -1;

int TestItem::s_parametrized_constructor_call_count = -1;

int TestItem::s_destructor_call_count = -1;

/* End of TestItem class. */

namespace {

void init_allocator_once() {
  static bool inited = false;
  if (!inited) {
    temptable::Allocator<int>::init();
  }
}

}  // namespace

TEST(Allocator, BasicAlloc) {
  Allocator_helper::set_allocator_max_ram_default();
  init_allocator_once();

  using Item = int;
  const int ITEM_COUNT = 100;

  temptable::Allocator<Item> allocator;

  std::vector<int *> item_pointers;
  item_pointers.assign(ITEM_COUNT, nullptr);

  /* Allocate and then deallocate in same order. */
  for (int i = 0; i < ITEM_COUNT; ++i) {
    EXPECT_NO_THROW(item_pointers[i] = allocator.allocate(i + 1));
  }
  for (int i = 0; i < ITEM_COUNT; ++i) {
    EXPECT_NO_THROW(allocator.deallocate(item_pointers[i], i + 1));
    item_pointers[i] = nullptr;
  }

  /* Allocate and then deallocate in reverse order. */
  for (int i = 0; i < ITEM_COUNT; ++i) {
    EXPECT_NO_THROW(item_pointers[i] = allocator.allocate(i + 1));
  }
  for (int i = ITEM_COUNT - 1; i >= 0; --i) {
    EXPECT_NO_THROW(allocator.deallocate(item_pointers[i], i + 1));
    item_pointers[i] = nullptr;
  }

  /* Allocate and then deallocate in quasi-random order. */
  for (int i = 0; i < ITEM_COUNT; ++i) {
    EXPECT_NO_THROW(item_pointers[i] = allocator.allocate(i + 1));
  }
  for (int i = 0; i < ITEM_COUNT; i += 3) {
    EXPECT_NO_THROW(allocator.deallocate(item_pointers[i], i + 1));
    item_pointers[i] = nullptr;
  }
  for (int i = ITEM_COUNT - 1; i >= 0; --i) {
    if (item_pointers[i]) {
      EXPECT_NO_THROW(allocator.deallocate(item_pointers[i], i + 1));
      item_pointers[i] = nullptr;
    }
  }
}

TEST(Allocator, ZeroSize) {
  Allocator_helper::set_allocator_max_ram_default();
  init_allocator_once();

  temptable::Allocator<int> allocator;

  int *item = nullptr;

  EXPECT_NO_THROW(item = allocator.allocate(0));
  EXPECT_NO_THROW(allocator.deallocate(item, 0));
}

TEST(Allocator, ConstructDestroy) {
  Allocator_helper::set_allocator_max_ram_default();
  init_allocator_once();

  temptable::Allocator<TestItem> allocator;

  TestItem *item = nullptr;

  TestItem::reset_counters();

  EXPECT_NO_THROW(item = allocator.allocate(1));
  EXPECT_NO_THROW(allocator.construct(item));
  EXPECT_EQ(item->get_first(), 0);
  EXPECT_EQ(item->get_second(), 0);
  EXPECT_NO_THROW(allocator.destroy(item));
  EXPECT_NO_THROW(allocator.deallocate(item, 1));
  item = nullptr;

  EXPECT_NO_THROW(item = allocator.allocate(1));
  EXPECT_NO_THROW(allocator.construct(item, 1, 2));
  EXPECT_EQ(item->get_first(), 1);
  EXPECT_EQ(item->get_second(), 2);
  EXPECT_NO_THROW(allocator.destroy(item));
  EXPECT_NO_THROW(allocator.deallocate(item, 1));
  item = nullptr;

  EXPECT_EQ(TestItem::get_default_constructor_call_count(), 1);
  EXPECT_EQ(TestItem::get_parametrized_constructor_call_count(), 1);
  EXPECT_EQ(TestItem::get_destructor_call_count(), 2);
}

TEST(Allocator, Casts) {
  Allocator_helper::set_allocator_max_ram_default();
  init_allocator_once();

  using ItemType1 = char;
  using ItemType2 = int;
  using ItemType3 = TestItem;

  temptable::Allocator<ItemType1> allocator1;
  temptable::Allocator<ItemType2> allocator2(allocator1);
  temptable::Allocator<ItemType3> allocator3(allocator2);

  EXPECT_EQ(allocator1, allocator2);
  EXPECT_EQ(allocator1, allocator3);
  EXPECT_EQ(allocator2, allocator3);

  ItemType1 *items1[2] = {};
  ItemType2 *items2[2] = {};
  ItemType3 *items3[2] = {};

  EXPECT_NO_THROW(items1[0] = allocator1.allocate(1));
  EXPECT_NO_THROW(items2[0] = allocator2.allocate(1));
  EXPECT_NO_THROW(items3[0] = allocator3.allocate(1));
  EXPECT_NO_THROW(items1[1] = allocator1.allocate(1));
  EXPECT_NO_THROW(items2[1] = allocator2.allocate(1));
  EXPECT_NO_THROW(items3[1] = allocator3.allocate(1));

  EXPECT_NO_THROW(allocator3.deallocate(items3[0], 1));
  EXPECT_NO_THROW(allocator3.deallocate(items3[1], 1));
  EXPECT_NO_THROW(allocator2.deallocate(items2[0], 1));
  EXPECT_NO_THROW(allocator2.deallocate(items2[1], 1));
  EXPECT_NO_THROW(allocator1.deallocate(items1[0], 1));
  EXPECT_NO_THROW(allocator1.deallocate(items1[1], 1));
}

}  // namespace temptable_test