jdk-24/test/hotspot/gtest/gc/z/test_zLiveMap.cpp

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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#include "precompiled.hpp"
#include "gc/z/zGenerationId.hpp"
#include "gc/z/zGlobals.hpp"
#include "gc/z/zLiveMap.inline.hpp"
#include "unittest.hpp"

class ZLiveMapTest : public ::testing::Test {
private:
  // Setup and tear down
  ZHeap*            _old_heap;
  ZGenerationOld*   _old_old;
  ZGenerationYoung* _old_young;

public:

  virtual void SetUp() {
    ZGlobalsPointers::initialize();
    _old_heap = ZHeap::_heap;
    ZHeap::_heap = (ZHeap*)os::malloc(sizeof(ZHeap), mtTest);

    _old_old = ZGeneration::_old;
    _old_young = ZGeneration::_young;

    ZGeneration::_old = &ZHeap::_heap->_old;
    ZGeneration::_young = &ZHeap::_heap->_young;

    *const_cast<ZGenerationId*>(&ZGeneration::_old->_id) = ZGenerationId::old;
    *const_cast<ZGenerationId*>(&ZGeneration::_young->_id) = ZGenerationId::young;

    ZGeneration::_old->_seqnum = 1;
    ZGeneration::_young->_seqnum = 2;
  }

  virtual void TearDown() {
    os::free(ZHeap::_heap);
    ZHeap::_heap = _old_heap;
    ZGeneration::_old = _old_old;
    ZGeneration::_young = _old_young;
  }

protected:
  static void strongly_live_for_large_zpage() {
    // Large ZPages only have room for one object.
    ZLiveMap livemap(1);

    bool inc_live;
    BitMap::idx_t object_index = BitMap::idx_t(0);

    // Mark the object strong.
    livemap.set(ZGenerationId::old, object_index, false /* finalizable */, inc_live);

    // Check that both bits are in the same segment.
    ASSERT_EQ(livemap.index_to_segment(0), livemap.index_to_segment(1));

    // Check that the object was marked.
    ASSERT_TRUE(livemap.get(ZGenerationId::old, 0));

    // Check that the object was strongly marked.
    ASSERT_TRUE(livemap.get(ZGenerationId::old, 1));

    ASSERT_TRUE(inc_live);
  }
};

TEST_F(ZLiveMapTest, strongly_live_for_large_zpage) {
  strongly_live_for_large_zpage();
}