32     using GCBitsetWord = uint32_t;
33     static constexpr uint32_t BYTE_PER_WORD = sizeof(GCBitsetWord);
34     static constexpr uint32_t BYTE_PER_WORD_LOG2 = base::MathHelper::GetIntLog2(BYTE_PER_WORD);
35     static constexpr uint32_t BIT_PER_BYTE = 8;
36     static constexpr uint32_t BIT_PER_BYTE_LOG2 = base::MathHelper::GetIntLog2(BIT_PER_BYTE);
37     static constexpr uint32_t BIT_PER_WORD = BYTE_PER_WORD * BIT_PER_BYTE;
38     static constexpr uint32_t BIT_PER_WORD_LOG2 = base::MathHelper::GetIntLog2(BIT_PER_WORD);
39     static constexpr uint32_t BIT_PER_WORD_MASK = BIT_PER_WORD - 1;
63     void SetGCWords(uint32_t index) // Only used for snapshot to record region index  in SetGCWords()
71         uint32_t wordCount = static_cast<uint32_t>(WordCount(bitSize));  in Clear()
72         for (uint32_t i = 0; i < wordCount; i++) {  in Clear()
80         uint32_t wordCount = static_cast<uint32_t>(WordCount(bitSize));  in SetAllBits()
82         for (uint32_t i = 0; i < wordCount; i++) {  in SetAllBits()
99         uint32_t startIndex = Index(offsetBegin);  in ClearBitRange()
100         uint32_t startIndexMask = Mask(IndexInWord(offsetBegin));  in ClearBitRange()
101         uint32_t endIndex = Index(offsetEnd - 1);  in ClearBitRange()
102         uint32_t endIndexMask = Mask(IndexInWord(offsetEnd - 1));  in ClearBitRange()
124         uint32_t wordCount = WordCount(bitSize);  in IterateMarkedBits()
125         uint32_t index = BIT_PER_WORD;  in IterateMarkedBits()
126         for (uint32_t i = 0; i < wordCount; i++) {  in IterateMarkedBits()
127             uint32_t word = words[i];  in IterateMarkedBits()
129                 index = static_cast<uint32_t>(__builtin_ctz(word));  in IterateMarkedBits()
144         uint32_t wordCount = WordCount(bitSize);  in IterateMarkedBitsConst()
145         uint32_t index = BIT_PER_WORD;  in IterateMarkedBitsConst()
146         for (uint32_t i = 0; i < wordCount; i++) {  in IterateMarkedBitsConst()
147             uint32_t word = words[i];  in IterateMarkedBitsConst()
149                 index = static_cast<uint32_t>(__builtin_ctz(word));  in IterateMarkedBitsConst()
161         uint32_t wordCount = WordCount(bitSize);  in Merge()
162         for (uint32_t i = 0; i < wordCount; i++) {  in Merge()
189     bool ClearWord(uint32_t index, uint32_t mask);
192     bool ClearWord<AccessType::NON_ATOMIC>(uint32_t index, uint32_t mask)
202     bool ClearWord<AccessType::ATOMIC>(uint32_t index, uint32_t mask)