blob: 8a15af2fbc7206c2dc7e13e577a3fce4d3061b86 [file] [log] [blame]
/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "bitmap-inl.h"
#include <sys/mman.h> // For the PROT_* and MAP_* constants.
#include "base/bit_utils.h"
#include "base/mem_map.h"
#include "card_table.h"
#include "jit/jit_code_cache.h"
namespace art {
namespace gc {
namespace accounting {
Bitmap* Bitmap::CreateFromMemMap(MemMap&& mem_map, size_t num_bits) {
CHECK(mem_map.IsValid());
return new Bitmap(std::move(mem_map), num_bits);
}
Bitmap::Bitmap(MemMap&& mem_map, size_t bitmap_size)
: mem_map_(std::move(mem_map)),
bitmap_begin_(reinterpret_cast<uintptr_t*>(mem_map_.Begin())),
bitmap_size_(bitmap_size) {
CHECK(bitmap_begin_ != nullptr);
CHECK_NE(bitmap_size, 0U);
}
Bitmap::~Bitmap() {
// Destroys member MemMap.
}
MemMap Bitmap::AllocateMemMap(const std::string& name, size_t num_bits) {
const size_t bitmap_size = RoundUp(
RoundUp(num_bits, kBitsPerBitmapWord) / kBitsPerBitmapWord * sizeof(uintptr_t), kPageSize);
std::string error_msg;
MemMap mem_map = MemMap::MapAnonymous(name.c_str(),
bitmap_size,
PROT_READ | PROT_WRITE,
/*low_4gb=*/ false,
&error_msg);
if (UNLIKELY(!mem_map.IsValid())) {
LOG(ERROR) << "Failed to allocate bitmap " << name << ": " << error_msg;
}
return mem_map;
}
Bitmap* Bitmap::Create(const std::string& name, size_t num_bits) {
MemMap mem_map = AllocateMemMap(name, num_bits);
if (UNLIKELY(!mem_map.IsValid())) {
return nullptr;
}
return CreateFromMemMap(std::move(mem_map), num_bits);
}
void Bitmap::Clear() {
if (bitmap_begin_ != nullptr) {
mem_map_.MadviseDontNeedAndZero();
}
}
void Bitmap::CopyFrom(Bitmap* source_bitmap) {
DCHECK_EQ(BitmapSize(), source_bitmap->BitmapSize());
std::copy(source_bitmap->Begin(),
source_bitmap->Begin() + BitmapSize() / kBitsPerBitmapWord, Begin());
}
template<size_t kAlignment>
MemoryRangeBitmap<kAlignment>* MemoryRangeBitmap<kAlignment>::Create(
const std::string& name, uintptr_t cover_begin, uintptr_t cover_end) {
CHECK_ALIGNED(cover_begin, kAlignment);
CHECK_ALIGNED(cover_end, kAlignment);
const size_t num_bits = (cover_end - cover_begin) / kAlignment;
MemMap mem_map = Bitmap::AllocateMemMap(name, num_bits);
CHECK(mem_map.IsValid());
return CreateFromMemMap(std::move(mem_map), cover_begin, num_bits);
}
template<size_t kAlignment>
MemoryRangeBitmap<kAlignment>* MemoryRangeBitmap<kAlignment>::CreateFromMemMap(
MemMap&& mem_map, uintptr_t begin, size_t num_bits) {
return new MemoryRangeBitmap(std::move(mem_map), begin, num_bits);
}
template class MemoryRangeBitmap<CardTable::kCardSize>;
template class MemoryRangeBitmap<jit::kJitCodeAlignment>;
} // namespace accounting
} // namespace gc
} // namespace art