jdk-24/test/hotspot/gtest/runtime/test_atomic.cpp

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#include "precompiled.hpp"
#include "runtime/atomic.hpp"
#include "unittest.hpp"

// These tests of Atomic only verify functionality.  They don't verify atomicity.

template<typename T>
struct AtomicAddTestSupport {
  volatile T _test_value;

  AtomicAddTestSupport() : _test_value{} {}

  void test_add() {
    T zero = 0;
    T five = 5;
    Atomic::store(&_test_value, zero);
    T value = Atomic::add(&_test_value, five);
    EXPECT_EQ(five, value);
    EXPECT_EQ(five, Atomic::load(&_test_value));
  }

  void test_fetch_add() {
    T zero = 0;
    T five = 5;
    Atomic::store(&_test_value, zero);
    T value = Atomic::fetch_and_add(&_test_value, five);
    EXPECT_EQ(zero, value);
    EXPECT_EQ(five, Atomic::load(&_test_value));
  }
};

TEST(AtomicAddTest, int32) {
  using Support = AtomicAddTestSupport<int32_t>;
  Support().test_add();
  Support().test_fetch_add();
}

// 64bit Atomic::add is only supported on 64bit platforms.
#ifdef _LP64
TEST(AtomicAddTest, int64) {
  using Support = AtomicAddTestSupport<int64_t>;
  Support().test_add();
  Support().test_fetch_add();
}
#endif // _LP64

TEST(AtomicAddTest, ptr) {
  uint _test_values[10] = {};
  uint* volatile _test_value{};

  uint* zero = &_test_values[0];
  uint* five = &_test_values[5];
  uint* six  = &_test_values[6];

  Atomic::store(&_test_value, zero);
  uint* value = Atomic::add(&_test_value, 5);
  EXPECT_EQ(five, value);
  EXPECT_EQ(five, Atomic::load(&_test_value));

  Atomic::store(&_test_value, zero);
  value = Atomic::fetch_and_add(&_test_value, 6);
  EXPECT_EQ(zero, value);
  EXPECT_EQ(six, Atomic::load(&_test_value));
};

template<typename T>
struct AtomicXchgTestSupport {
  volatile T _test_value;

  AtomicXchgTestSupport() : _test_value{} {}

  void test() {
    T zero = 0;
    T five = 5;
    Atomic::store(&_test_value, zero);
    T res = Atomic::xchg(&_test_value, five);
    EXPECT_EQ(zero, res);
    EXPECT_EQ(five, Atomic::load(&_test_value));
  }
};

TEST(AtomicXchgTest, int32) {
  using Support = AtomicXchgTestSupport<int32_t>;
  Support().test();
}

// 64bit Atomic::xchg is only supported on 64bit platforms.
#ifdef _LP64
TEST(AtomicXchgTest, int64) {
  using Support = AtomicXchgTestSupport<int64_t>;
  Support().test();
}
#endif // _LP64

template<typename T>
struct AtomicCmpxchgTestSupport {
  volatile T _test_value;

  AtomicCmpxchgTestSupport() : _test_value{} {}

  void test() {
    T zero = 0;
    T five = 5;
    T ten = 10;
    Atomic::store(&_test_value, zero);
    T res = Atomic::cmpxchg(&_test_value, five, ten);
    EXPECT_EQ(zero, res);
    EXPECT_EQ(zero, Atomic::load(&_test_value));
    res = Atomic::cmpxchg(&_test_value, zero, ten);
    EXPECT_EQ(zero, res);
    EXPECT_EQ(ten, Atomic::load(&_test_value));
  }
};

TEST(AtomicCmpxchgTest, int32) {
  using Support = AtomicCmpxchgTestSupport<int32_t>;
  Support().test();
}

TEST(AtomicCmpxchgTest, int64) {
  using Support = AtomicCmpxchgTestSupport<int64_t>;
  Support().test();
}

template<typename T>
struct AtomicEnumTestSupport {
  volatile T _test_value;

  AtomicEnumTestSupport() : _test_value{} {}

  void test_store_load(T value) {
    EXPECT_NE(value, Atomic::load(&_test_value));
    Atomic::store(&_test_value, value);
    EXPECT_EQ(value, Atomic::load(&_test_value));
  }

  void test_cmpxchg(T value1, T value2) {
    EXPECT_NE(value1, Atomic::load(&_test_value));
    Atomic::store(&_test_value, value1);
    EXPECT_EQ(value1, Atomic::cmpxchg(&_test_value, value2, value2));
    EXPECT_EQ(value1, Atomic::load(&_test_value));
    EXPECT_EQ(value1, Atomic::cmpxchg(&_test_value, value1, value2));
    EXPECT_EQ(value2, Atomic::load(&_test_value));
  }

  void test_xchg(T value1, T value2) {
    EXPECT_NE(value1, Atomic::load(&_test_value));
    Atomic::store(&_test_value, value1);
    EXPECT_EQ(value1, Atomic::xchg(&_test_value, value2));
    EXPECT_EQ(value2, Atomic::load(&_test_value));
  }
};

namespace AtomicEnumTestUnscoped {       // Scope the enumerators.
  enum TestEnum { A, B, C };
}

TEST(AtomicEnumTest, unscoped_enum) {
  using namespace AtomicEnumTestUnscoped;
  using Support = AtomicEnumTestSupport<TestEnum>;

  Support().test_store_load(B);
  Support().test_cmpxchg(B, C);
  Support().test_xchg(B, C);
}

enum class AtomicEnumTestScoped { A, B, C };

TEST(AtomicEnumTest, scoped_enum) {
  const AtomicEnumTestScoped B = AtomicEnumTestScoped::B;
  const AtomicEnumTestScoped C = AtomicEnumTestScoped::C;
  using Support = AtomicEnumTestSupport<AtomicEnumTestScoped>;

  Support().test_store_load(B);
  Support().test_cmpxchg(B, C);
  Support().test_xchg(B, C);
}