test/hotspot/gtest/utilities/test_objectBitSet.cpp

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#include "precompiled.hpp"
#include "memory/allocation.hpp"
#include "utilities/objectBitSet.inline.hpp"
#include "unittest.hpp"

TEST_VM(ObjectBitSet, empty) {
  ObjectBitSet<mtTracing> obs;
  oopDesc obj1;
  ASSERT_FALSE(obs.is_marked(&obj1));
}

// NOTE: This is a little weird. NULL is not treated any special: ObjectBitSet will happily
// allocate a fragement for the memory range starting at 0 and mark the first bit when passing NULL.
// In the absense of any error handling, I am not sure what would possibly be a reasonable better
// way to do it, though.
TEST_VM(ObjectBitSet, null) {
  ObjectBitSet<mtTracing> obs;
  ASSERT_FALSE(obs.is_marked((oop)NULL));
  obs.mark_obj((oop) NULL);
  ASSERT_TRUE(obs.is_marked((oop)NULL));
}

TEST_VM(ObjectBitSet, mark_single) {
  ObjectBitSet<mtTracing> obs;
  oopDesc obj1;
  ASSERT_FALSE(obs.is_marked(&obj1));
  obs.mark_obj(&obj1);
  ASSERT_TRUE(obs.is_marked(&obj1));
}

TEST_VM(ObjectBitSet, mark_multi) {
  ObjectBitSet<mtTracing> obs;
  oopDesc obj1;
  oopDesc obj2;
  ASSERT_FALSE(obs.is_marked(&obj1));
  ASSERT_FALSE(obs.is_marked(&obj2));
  obs.mark_obj(&obj1);
  ASSERT_TRUE(obs.is_marked(&obj1));
  ASSERT_FALSE(obs.is_marked(&obj2));
  obs.mark_obj(&obj2);
  ASSERT_TRUE(obs.is_marked(&obj1));
  ASSERT_TRUE(obs.is_marked(&obj2));
}