1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "bitmap-inl.h" 18 19 #include "base/bit_utils.h" 20 #include "card_table.h" 21 #include "jit/jit_code_cache.h" 22 #include "mem_map.h" 23 24 namespace art { 25 namespace gc { 26 namespace accounting { 27 28 Bitmap* Bitmap::CreateFromMemMap(MemMap* mem_map, size_t num_bits) { 29 CHECK(mem_map != nullptr); 30 return new Bitmap(mem_map, num_bits); 31 } 32 33 Bitmap::Bitmap(MemMap* mem_map, size_t bitmap_size) 34 : mem_map_(mem_map), bitmap_begin_(reinterpret_cast<uintptr_t*>(mem_map->Begin())), 35 bitmap_size_(bitmap_size) { 36 CHECK(bitmap_begin_ != nullptr); 37 CHECK_NE(bitmap_size, 0U); 38 } 39 40 Bitmap::~Bitmap() { 41 // Destroys MemMap via std::unique_ptr<>. 42 } 43 44 MemMap* Bitmap::AllocateMemMap(const std::string& name, size_t num_bits) { 45 const size_t bitmap_size = RoundUp( 46 RoundUp(num_bits, kBitsPerBitmapWord) / kBitsPerBitmapWord * sizeof(uintptr_t), kPageSize); 47 std::string error_msg; 48 std::unique_ptr<MemMap> mem_map(MemMap::MapAnonymous(name.c_str(), nullptr, bitmap_size, 49 PROT_READ | PROT_WRITE, false, false, 50 &error_msg)); 51 if (UNLIKELY(mem_map.get() == nullptr)) { 52 LOG(ERROR) << "Failed to allocate bitmap " << name << ": " << error_msg; 53 return nullptr; 54 } 55 return mem_map.release(); 56 } 57 58 Bitmap* Bitmap::Create(const std::string& name, size_t num_bits) { 59 auto* const mem_map = AllocateMemMap(name, num_bits); 60 if (mem_map == nullptr) { 61 return nullptr; 62 } 63 return CreateFromMemMap(mem_map, num_bits); 64 } 65 66 void Bitmap::Clear() { 67 if (bitmap_begin_ != nullptr) { 68 mem_map_->MadviseDontNeedAndZero(); 69 } 70 } 71 72 void Bitmap::CopyFrom(Bitmap* source_bitmap) { 73 DCHECK_EQ(BitmapSize(), source_bitmap->BitmapSize()); 74 std::copy(source_bitmap->Begin(), 75 source_bitmap->Begin() + BitmapSize() / kBitsPerBitmapWord, Begin()); 76 } 77 78 template<size_t kAlignment> 79 MemoryRangeBitmap<kAlignment>* MemoryRangeBitmap<kAlignment>::Create( 80 const std::string& name, uintptr_t cover_begin, uintptr_t cover_end) { 81 CHECK_ALIGNED(cover_begin, kAlignment); 82 CHECK_ALIGNED(cover_end, kAlignment); 83 const size_t num_bits = (cover_end - cover_begin) / kAlignment; 84 auto* const mem_map = Bitmap::AllocateMemMap(name, num_bits); 85 return CreateFromMemMap(mem_map, cover_begin, num_bits); 86 } 87 88 template<size_t kAlignment> 89 MemoryRangeBitmap<kAlignment>* MemoryRangeBitmap<kAlignment>::CreateFromMemMap( 90 MemMap* mem_map, uintptr_t begin, size_t num_bits) { 91 return new MemoryRangeBitmap(mem_map, begin, num_bits); 92 } 93 94 template class MemoryRangeBitmap<CardTable::kCardSize>; 95 template class MemoryRangeBitmap<jit::kJitCodeAlignment>; 96 97 } // namespace accounting 98 } // namespace gc 99 } // namespace art 100 101
