43 };
  44 
  45 TEST(Metachunk, basic) {
  46   const ChunkIndex chunk_type = MediumIndex;
  47   const bool is_class = false;
  48   const size_t word_size = get_size_for_nonhumongous_chunktype(chunk_type, is_class);
  49   // Allocate the chunk with correct alignment.
  50   void* memory = malloc(word_size * BytesPerWord * 2);
  51   ASSERT_TRUE(NULL != memory) << "Failed to malloc 2MB";
  52 
  53   void* p_placement = align_up(memory, word_size * BytesPerWord);
  54 
  55   Metachunk* metachunk = ::new (p_placement) Metachunk(chunk_type, is_class, word_size, NULL);
  56 
  57   EXPECT_EQ((MetaWord*) metachunk, metachunk->bottom());
  58   EXPECT_EQ((uintptr_t*) metachunk + metachunk->size(), metachunk->end());
  59 
  60   // Check sizes
  61   EXPECT_EQ(metachunk->size(), metachunk->word_size());
  62   EXPECT_EQ(pointer_delta(metachunk->end(), metachunk->bottom(),
  63                 sizeof (MetaWord*)),
  64             metachunk->word_size());
  65 
  66   // Check usage
  67   EXPECT_EQ(metachunk->used_word_size(), metachunk->overhead());
  68   EXPECT_EQ(metachunk->word_size() - metachunk->used_word_size(),
  69             metachunk->free_word_size());
  70   EXPECT_EQ(MetachunkTest::top(metachunk), MetachunkTest::initial_top(metachunk));
  71   EXPECT_TRUE(metachunk->is_empty());
  72 
  73   // Allocate
  74   size_t alloc_size = 64; // Words
  75   EXPECT_TRUE(is_aligned(alloc_size, Metachunk::object_alignment()));
  76 
  77   MetaWord* mem = metachunk->allocate(alloc_size);
  78 
  79   // Check post alloc
  80   EXPECT_EQ(MetachunkTest::initial_top(metachunk), mem);
  81   EXPECT_EQ(MetachunkTest::top(metachunk), mem + alloc_size);
  82   EXPECT_EQ(metachunk->overhead() + alloc_size, metachunk->used_word_size());
  83   EXPECT_EQ(metachunk->word_size() - metachunk->used_word_size(),

  43 };
  44 
  45 TEST(Metachunk, basic) {
  46   const ChunkIndex chunk_type = MediumIndex;
  47   const bool is_class = false;
  48   const size_t word_size = get_size_for_nonhumongous_chunktype(chunk_type, is_class);
  49   // Allocate the chunk with correct alignment.
  50   void* memory = malloc(word_size * BytesPerWord * 2);
  51   ASSERT_TRUE(NULL != memory) << "Failed to malloc 2MB";
  52 
  53   void* p_placement = align_up(memory, word_size * BytesPerWord);
  54 
  55   Metachunk* metachunk = ::new (p_placement) Metachunk(chunk_type, is_class, word_size, NULL);
  56 
  57   EXPECT_EQ((MetaWord*) metachunk, metachunk->bottom());
  58   EXPECT_EQ((uintptr_t*) metachunk + metachunk->size(), metachunk->end());
  59 
  60   // Check sizes
  61   EXPECT_EQ(metachunk->size(), metachunk->word_size());
  62   EXPECT_EQ(pointer_delta(metachunk->end(), metachunk->bottom(),
  63                           sizeof (MetaWord)),
  64             metachunk->word_size());
  65 
  66   // Check usage
  67   EXPECT_EQ(metachunk->used_word_size(), metachunk->overhead());
  68   EXPECT_EQ(metachunk->word_size() - metachunk->used_word_size(),
  69             metachunk->free_word_size());
  70   EXPECT_EQ(MetachunkTest::top(metachunk), MetachunkTest::initial_top(metachunk));
  71   EXPECT_TRUE(metachunk->is_empty());
  72 
  73   // Allocate
  74   size_t alloc_size = 64; // Words
  75   EXPECT_TRUE(is_aligned(alloc_size, Metachunk::object_alignment()));
  76 
  77   MetaWord* mem = metachunk->allocate(alloc_size);
  78 
  79   // Check post alloc
  80   EXPECT_EQ(MetachunkTest::initial_top(metachunk), mem);
  81   EXPECT_EQ(MetachunkTest::top(metachunk), mem + alloc_size);
  82   EXPECT_EQ(metachunk->overhead() + alloc_size, metachunk->used_word_size());
  83   EXPECT_EQ(metachunk->word_size() - metachunk->used_word_size(),