space_bitmap.cc revision 6e6078ab06e16bb4032b363316360f3b76685e30
1b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier/* 2b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier * Copyright (C) 2008 The Android Open Source Project 3b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier * 4b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier * Licensed under the Apache License, Version 2.0 (the "License"); 5b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier * you may not use this file except in compliance with the License. 6b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier * You may obtain a copy of the License at 7b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier * 8b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier * http://www.apache.org/licenses/LICENSE-2.0 9b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier * 10b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier * Unless required by applicable law or agreed to in writing, software 11b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier * distributed under the License is distributed on an "AS IS" BASIS, 12b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier * See the License for the specific language governing permissions and 14b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier * limitations under the License. 15b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier */ 16b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier 172dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers#include "space_bitmap-inl.h" 18b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier 19c785344b87221f5e4e6473e5b762e4e61fe65dcfMathieu Chartier#include "art_field-inl.h" 2022d5e735f403c57525fe868304c7123f0ce66399Ian Rogers#include "base/stringprintf.h" 21956af0f0cb05422e38c1d22cbef309d16b8a1a12Elliott Hughes#include "dex_file-inl.h" 2222d5e735f403c57525fe868304c7123f0ce66399Ian Rogers#include "mem_map.h" 2322d5e735f403c57525fe868304c7123f0ce66399Ian Rogers#include "mirror/object-inl.h" 24e401d146407d61eeb99f8d6176b2ac13c4df1e33Mathieu Chartier#include "mirror/class-inl.h" 2522d5e735f403c57525fe868304c7123f0ce66399Ian Rogers#include "mirror/object_array.h" 2622d5e735f403c57525fe868304c7123f0ce66399Ian Rogers 27b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartiernamespace art { 281d54e73444e017d3a65234e0f193846f3e27472bIan Rogersnamespace gc { 291d54e73444e017d3a65234e0f193846f3e27472bIan Rogersnamespace accounting { 30b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier 31a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartiertemplate<size_t kAlignment> 3273d1e17b3afc7d5e56184f90bf819dc64956448aMathieu Chartiersize_t SpaceBitmap<kAlignment>::ComputeBitmapSize(uint64_t capacity) { 3313735955f39b3b304c37d2b2840663c131262c18Ian Rogers const uint64_t kBytesCoveredPerWord = kAlignment * kBitsPerIntPtrT; 3413735955f39b3b304c37d2b2840663c131262c18Ian Rogers return (RoundUp(capacity, kBytesCoveredPerWord) / kBytesCoveredPerWord) * sizeof(intptr_t); 3573d1e17b3afc7d5e56184f90bf819dc64956448aMathieu Chartier} 3673d1e17b3afc7d5e56184f90bf819dc64956448aMathieu Chartier 3773d1e17b3afc7d5e56184f90bf819dc64956448aMathieu Chartiertemplate<size_t kAlignment> 38d39645e22b8db1767cf64dc1200a9e4b2f939ed2Mathieu Chartiersize_t SpaceBitmap<kAlignment>::ComputeHeapSize(uint64_t bitmap_bytes) { 39d39645e22b8db1767cf64dc1200a9e4b2f939ed2Mathieu Chartier return bitmap_bytes * kBitsPerByte * kAlignment; 40d39645e22b8db1767cf64dc1200a9e4b2f939ed2Mathieu Chartier} 41d39645e22b8db1767cf64dc1200a9e4b2f939ed2Mathieu Chartier 42d39645e22b8db1767cf64dc1200a9e4b2f939ed2Mathieu Chartiertemplate<size_t kAlignment> 43a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu ChartierSpaceBitmap<kAlignment>* SpaceBitmap<kAlignment>::CreateFromMemMap( 4413735955f39b3b304c37d2b2840663c131262c18Ian Rogers const std::string& name, MemMap* mem_map, uint8_t* heap_begin, size_t heap_capacity) { 4531e8925781c2302f1d1a9b39e216ba415bfe0d7eMathieu Chartier CHECK(mem_map != nullptr); 4613735955f39b3b304c37d2b2840663c131262c18Ian Rogers uintptr_t* bitmap_begin = reinterpret_cast<uintptr_t*>(mem_map->Begin()); 4773d1e17b3afc7d5e56184f90bf819dc64956448aMathieu Chartier const size_t bitmap_size = ComputeBitmapSize(heap_capacity); 4831e8925781c2302f1d1a9b39e216ba415bfe0d7eMathieu Chartier return new SpaceBitmap(name, mem_map, bitmap_begin, bitmap_size, heap_begin); 4931e8925781c2302f1d1a9b39e216ba415bfe0d7eMathieu Chartier} 5031e8925781c2302f1d1a9b39e216ba415bfe0d7eMathieu Chartier 51a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartiertemplate<size_t kAlignment> 5213735955f39b3b304c37d2b2840663c131262c18Ian RogersSpaceBitmap<kAlignment>::SpaceBitmap(const std::string& name, MemMap* mem_map, uintptr_t* bitmap_begin, 53bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier size_t bitmap_size, const void* heap_begin) 54c381c36aacf977f7e314e6a91e47b31b04639f62Mathieu Chartier : mem_map_(mem_map), 55c381c36aacf977f7e314e6a91e47b31b04639f62Mathieu Chartier bitmap_begin_(reinterpret_cast<Atomic<uintptr_t>*>(bitmap_begin)), 56c381c36aacf977f7e314e6a91e47b31b04639f62Mathieu Chartier bitmap_size_(bitmap_size), 57bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier heap_begin_(reinterpret_cast<uintptr_t>(heap_begin)), 58bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier name_(name) { 59bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier CHECK(bitmap_begin_ != nullptr); 60bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier CHECK_NE(bitmap_size, 0U); 61bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier} 62bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier 63bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartiertemplate<size_t kAlignment> 6422d5e735f403c57525fe868304c7123f0ce66399Ian RogersSpaceBitmap<kAlignment>::~SpaceBitmap() {} 6522d5e735f403c57525fe868304c7123f0ce66399Ian Rogers 6622d5e735f403c57525fe868304c7123f0ce66399Ian Rogerstemplate<size_t kAlignment> 67a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu ChartierSpaceBitmap<kAlignment>* SpaceBitmap<kAlignment>::Create( 6813735955f39b3b304c37d2b2840663c131262c18Ian Rogers const std::string& name, uint8_t* heap_begin, size_t heap_capacity) { 69b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier // Round up since heap_capacity is not necessarily a multiple of kAlignment * kBitsPerWord. 7073d1e17b3afc7d5e56184f90bf819dc64956448aMathieu Chartier const size_t bitmap_size = ComputeBitmapSize(heap_capacity); 718d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan Rogers std::string error_msg; 72700a402244a1a423da4f3ba8032459f4b65fa18fIan Rogers std::unique_ptr<MemMap> mem_map(MemMap::MapAnonymous(name.c_str(), nullptr, bitmap_size, 735c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko PROT_READ | PROT_WRITE, false, false, 745c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko &error_msg)); 758d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan Rogers if (UNLIKELY(mem_map.get() == nullptr)) { 768d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan Rogers LOG(ERROR) << "Failed to allocate bitmap " << name << ": " << error_msg; 77bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier return nullptr; 78b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 7931e8925781c2302f1d1a9b39e216ba415bfe0d7eMathieu Chartier return CreateFromMemMap(name, mem_map.release(), heap_begin, heap_capacity); 80b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier} 81b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier 82a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartiertemplate<size_t kAlignment> 83a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartiervoid SpaceBitmap<kAlignment>::SetHeapLimit(uintptr_t new_end) { 8414d90579f013b374638b599361970557ed4b3f09Roland Levillain DCHECK_ALIGNED(new_end, kBitsPerIntPtrT * kAlignment); 8513735955f39b3b304c37d2b2840663c131262c18Ian Rogers size_t new_size = OffsetToIndex(new_end - heap_begin_) * sizeof(intptr_t); 86cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier if (new_size < bitmap_size_) { 87cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier bitmap_size_ = new_size; 88cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier } 89cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier // Not sure if doing this trim is necessary, since nothing past the end of the heap capacity 90cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier // should be marked. 91cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier} 92cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 93a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartiertemplate<size_t kAlignment> 94576ca0cd692c0b6ae70e776de91015b8ff000a08Ian Rogersstd::string SpaceBitmap<kAlignment>::Dump() const { 95576ca0cd692c0b6ae70e776de91015b8ff000a08Ian Rogers return StringPrintf("%s: %p-%p", name_.c_str(), reinterpret_cast<void*>(HeapBegin()), 96576ca0cd692c0b6ae70e776de91015b8ff000a08Ian Rogers reinterpret_cast<void*>(HeapLimit())); 97576ca0cd692c0b6ae70e776de91015b8ff000a08Ian Rogers} 98576ca0cd692c0b6ae70e776de91015b8ff000a08Ian Rogers 99576ca0cd692c0b6ae70e776de91015b8ff000a08Ian Rogerstemplate<size_t kAlignment> 100a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartiervoid SpaceBitmap<kAlignment>::Clear() { 101c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers if (bitmap_begin_ != nullptr) { 102c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers mem_map_->MadviseDontNeedAndZero(); 103b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 104b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier} 105b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier 106a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartiertemplate<size_t kAlignment> 1077ec38dcb84d61f6172bbb5a303bd5ab7139f7409Mathieu Chartiervoid SpaceBitmap<kAlignment>::ClearRange(const mirror::Object* begin, const mirror::Object* end) { 1087ec38dcb84d61f6172bbb5a303bd5ab7139f7409Mathieu Chartier uintptr_t begin_offset = reinterpret_cast<uintptr_t>(begin) - heap_begin_; 1097ec38dcb84d61f6172bbb5a303bd5ab7139f7409Mathieu Chartier uintptr_t end_offset = reinterpret_cast<uintptr_t>(end) - heap_begin_; 1107ec38dcb84d61f6172bbb5a303bd5ab7139f7409Mathieu Chartier // Align begin and end to word boundaries. 1117ec38dcb84d61f6172bbb5a303bd5ab7139f7409Mathieu Chartier while (begin_offset < end_offset && OffsetBitIndex(begin_offset) != 0) { 1127ec38dcb84d61f6172bbb5a303bd5ab7139f7409Mathieu Chartier Clear(reinterpret_cast<mirror::Object*>(heap_begin_ + begin_offset)); 1137ec38dcb84d61f6172bbb5a303bd5ab7139f7409Mathieu Chartier begin_offset += kAlignment; 1147ec38dcb84d61f6172bbb5a303bd5ab7139f7409Mathieu Chartier } 1157ec38dcb84d61f6172bbb5a303bd5ab7139f7409Mathieu Chartier while (begin_offset < end_offset && OffsetBitIndex(end_offset) != 0) { 1167ec38dcb84d61f6172bbb5a303bd5ab7139f7409Mathieu Chartier end_offset -= kAlignment; 1177ec38dcb84d61f6172bbb5a303bd5ab7139f7409Mathieu Chartier Clear(reinterpret_cast<mirror::Object*>(heap_begin_ + end_offset)); 1187ec38dcb84d61f6172bbb5a303bd5ab7139f7409Mathieu Chartier } 1197ec38dcb84d61f6172bbb5a303bd5ab7139f7409Mathieu Chartier const uintptr_t start_index = OffsetToIndex(begin_offset); 1207ec38dcb84d61f6172bbb5a303bd5ab7139f7409Mathieu Chartier const uintptr_t end_index = OffsetToIndex(end_offset); 1216e6078ab06e16bb4032b363316360f3b76685e30Mathieu Chartier ZeroAndReleasePages(reinterpret_cast<uint8_t*>(&bitmap_begin_[start_index]), 1226e6078ab06e16bb4032b363316360f3b76685e30Mathieu Chartier (end_index - start_index) * sizeof(*bitmap_begin_)); 1237ec38dcb84d61f6172bbb5a303bd5ab7139f7409Mathieu Chartier} 1247ec38dcb84d61f6172bbb5a303bd5ab7139f7409Mathieu Chartier 1257ec38dcb84d61f6172bbb5a303bd5ab7139f7409Mathieu Chartiertemplate<size_t kAlignment> 126bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartiervoid SpaceBitmap<kAlignment>::CopyFrom(SpaceBitmap* source_bitmap) { 127357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier DCHECK_EQ(Size(), source_bitmap->Size()); 128c381c36aacf977f7e314e6a91e47b31b04639f62Mathieu Chartier const size_t count = source_bitmap->Size() / sizeof(intptr_t); 129c381c36aacf977f7e314e6a91e47b31b04639f62Mathieu Chartier Atomic<uintptr_t>* const src = source_bitmap->Begin(); 130c381c36aacf977f7e314e6a91e47b31b04639f62Mathieu Chartier Atomic<uintptr_t>* const dest = Begin(); 131c381c36aacf977f7e314e6a91e47b31b04639f62Mathieu Chartier for (size_t i = 0; i < count; ++i) { 132c381c36aacf977f7e314e6a91e47b31b04639f62Mathieu Chartier dest[i].StoreRelaxed(src[i].LoadRelaxed()); 133c381c36aacf977f7e314e6a91e47b31b04639f62Mathieu Chartier } 134357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier} 135357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier 136a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartiertemplate<size_t kAlignment> 137bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartiervoid SpaceBitmap<kAlignment>::Walk(ObjectCallback* callback, void* arg) { 1382cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier CHECK(bitmap_begin_ != nullptr); 1392cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier CHECK(callback != nullptr); 140357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier 141357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier uintptr_t end = OffsetToIndex(HeapLimit() - heap_begin_ - 1); 142c381c36aacf977f7e314e6a91e47b31b04639f62Mathieu Chartier Atomic<uintptr_t>* bitmap_begin = bitmap_begin_; 143b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier for (uintptr_t i = 0; i <= end; ++i) { 144c381c36aacf977f7e314e6a91e47b31b04639f62Mathieu Chartier uintptr_t w = bitmap_begin[i].LoadRelaxed(); 145357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier if (w != 0) { 146b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier uintptr_t ptr_base = IndexToOffset(i) + heap_begin_; 147357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier do { 148cb8aea4bd5e77857c713edeb62bffcb1f7f06a39Andreas Gampe const size_t shift = CTZ(w); 1492dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers mirror::Object* obj = reinterpret_cast<mirror::Object*>(ptr_base + shift * kAlignment); 150b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier (*callback)(obj, arg); 15113735955f39b3b304c37d2b2840663c131262c18Ian Rogers w ^= (static_cast<uintptr_t>(1)) << shift; 152357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } while (w != 0); 153b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 154b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 155b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier} 156b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier 157a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartiertemplate<size_t kAlignment> 158a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartiervoid SpaceBitmap<kAlignment>::SweepWalk(const SpaceBitmap<kAlignment>& live_bitmap, 159bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier const SpaceBitmap<kAlignment>& mark_bitmap, 160bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier uintptr_t sweep_begin, uintptr_t sweep_end, 161bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier SpaceBitmap::SweepCallback* callback, void* arg) { 162bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier CHECK(live_bitmap.bitmap_begin_ != nullptr); 163bbd695c71e0bf518f582e84524e1cdeb3de3896cMathieu Chartier CHECK(mark_bitmap.bitmap_begin_ != nullptr); 164b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier CHECK_EQ(live_bitmap.heap_begin_, mark_bitmap.heap_begin_); 165b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier CHECK_EQ(live_bitmap.bitmap_size_, mark_bitmap.bitmap_size_); 1662cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier CHECK(callback != nullptr); 167b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier CHECK_LE(sweep_begin, sweep_end); 168b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier CHECK_GE(sweep_begin, live_bitmap.heap_begin_); 169357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier 170357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier if (sweep_end <= sweep_begin) { 171b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier return; 172b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 173357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier 1742dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers // TODO: rewrite the callbacks to accept a std::vector<mirror::Object*> rather than a mirror::Object**? 17513735955f39b3b304c37d2b2840663c131262c18Ian Rogers constexpr size_t buffer_size = sizeof(intptr_t) * kBitsPerIntPtrT; 176262a0a36ee5f553880365fecf0be1a188526ca69Andreas Gampe#ifdef __LP64__ 177262a0a36ee5f553880365fecf0be1a188526ca69Andreas Gampe // Heap-allocate for smaller stack frame. 178262a0a36ee5f553880365fecf0be1a188526ca69Andreas Gampe std::unique_ptr<mirror::Object*[]> pointer_buf_ptr(new mirror::Object*[buffer_size]); 179262a0a36ee5f553880365fecf0be1a188526ca69Andreas Gampe mirror::Object** pointer_buf = pointer_buf_ptr.get(); 180262a0a36ee5f553880365fecf0be1a188526ca69Andreas Gampe#else 181262a0a36ee5f553880365fecf0be1a188526ca69Andreas Gampe // Stack-allocate buffer as it's small enough. 1822dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers mirror::Object* pointer_buf[buffer_size]; 183262a0a36ee5f553880365fecf0be1a188526ca69Andreas Gampe#endif 1842dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers mirror::Object** pb = &pointer_buf[0]; 185262a0a36ee5f553880365fecf0be1a188526ca69Andreas Gampe 186b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier size_t start = OffsetToIndex(sweep_begin - live_bitmap.heap_begin_); 187357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier size_t end = OffsetToIndex(sweep_end - live_bitmap.heap_begin_ - 1); 18813735955f39b3b304c37d2b2840663c131262c18Ian Rogers CHECK_LT(end, live_bitmap.Size() / sizeof(intptr_t)); 189c381c36aacf977f7e314e6a91e47b31b04639f62Mathieu Chartier Atomic<uintptr_t>* live = live_bitmap.bitmap_begin_; 190c381c36aacf977f7e314e6a91e47b31b04639f62Mathieu Chartier Atomic<uintptr_t>* mark = mark_bitmap.bitmap_begin_; 191b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier for (size_t i = start; i <= end; i++) { 192c381c36aacf977f7e314e6a91e47b31b04639f62Mathieu Chartier uintptr_t garbage = live[i].LoadRelaxed() & ~mark[i].LoadRelaxed(); 193b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier if (UNLIKELY(garbage != 0)) { 194b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier uintptr_t ptr_base = IndexToOffset(i) + live_bitmap.heap_begin_; 195357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier do { 196cb8aea4bd5e77857c713edeb62bffcb1f7f06a39Andreas Gampe const size_t shift = CTZ(garbage); 19713735955f39b3b304c37d2b2840663c131262c18Ian Rogers garbage ^= (static_cast<uintptr_t>(1)) << shift; 1982dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers *pb++ = reinterpret_cast<mirror::Object*>(ptr_base + shift * kAlignment); 199357e9be24c17a6bc2ae9fb53f25c73503116101dMathieu Chartier } while (garbage != 0); 200b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier // Make sure that there are always enough slots available for an 201b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier // entire word of one bits. 20213735955f39b3b304c37d2b2840663c131262c18Ian Rogers if (pb >= &pointer_buf[buffer_size - kBitsPerIntPtrT]) { 203b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier (*callback)(pb - &pointer_buf[0], &pointer_buf[0], arg); 204b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier pb = &pointer_buf[0]; 205b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 206b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 207b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 208b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier if (pb > &pointer_buf[0]) { 209b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier (*callback)(pb - &pointer_buf[0], &pointer_buf[0], arg); 210b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier } 211b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier} 212b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier 213a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartiertemplate class SpaceBitmap<kObjectAlignment>; 214a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartiertemplate class SpaceBitmap<kPageSize>; 215a8e8f9c0a8e259a807d7b99a148d14104c24209dMathieu Chartier 2161d54e73444e017d3a65234e0f193846f3e27472bIan Rogers} // namespace accounting 2171d54e73444e017d3a65234e0f193846f3e27472bIan Rogers} // namespace gc 218b062fdd4cb097fbae69b4bcb479c34d83ecab8caMathieu Chartier} // namespace art 219