1 // Copyright 2010 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "src/bit-vector.h" 6 7 #include "src/base/bits.h" 8 9 namespace v8 { 10 namespace internal { 11 12 #ifdef DEBUG 13 void BitVector::Print() { 14 bool first = true; 15 PrintF("{"); 16 for (int i = 0; i < length(); i++) { 17 if (Contains(i)) { 18 if (!first) PrintF(","); 19 first = false; 20 PrintF("%d", i); 21 } 22 } 23 PrintF("}\n"); 24 } 25 #endif 26 27 28 void BitVector::Iterator::Advance() { 29 current_++; 30 uintptr_t val = current_value_; 31 while (val == 0) { 32 current_index_++; 33 if (Done()) return; 34 val = target_->data_[current_index_]; 35 current_ = current_index_ << kDataBitShift; 36 } 37 val = SkipZeroBytes(val); 38 val = SkipZeroBits(val); 39 current_value_ = val >> 1; 40 } 41 42 43 int BitVector::Count() const { 44 int count = 0; 45 for (int i = 0; i < data_length_; i++) { 46 uintptr_t data = data_[i]; 47 if (sizeof(data) == 8) { 48 count += base::bits::CountPopulation64(data); 49 } else { 50 count += base::bits::CountPopulation32(static_cast<uint32_t>(data)); 51 } 52 } 53 return count; 54 } 55 56 } // namespace internal 57 } // namespace v8 58
