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/*
* Copyright (C) 2017 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 "dex_file_layout.h"
#include "base/bit_utils.h"
#include "base/mman.h"
#include "dex_file.h"
namespace art {
int DexLayoutSection::MadviseLargestPageAlignedRegion(const uint8_t* begin,
const uint8_t* end,
int advice) {
#ifdef _WIN32
UNUSED(begin);
UNUSED(end);
UNUSED(advice);
PLOG(WARNING) << "madvise is unsupported on Windows.";
#else
DCHECK_LE(begin, end);
begin = AlignUp(begin, kPageSize);
end = AlignDown(end, kPageSize);
if (begin < end) {
// TODO: remove the direct dependency on madvise here.
int result = madvise(const_cast<uint8_t*>(begin), end - begin, advice);
if (result != 0) {
PLOG(WARNING) << "madvise failed " << result;
}
return result;
}
#endif
return 0;
}
void DexLayoutSection::Subsection::Madvise(const DexFile* dex_file, int advice) const {
DCHECK(dex_file != nullptr);
DCHECK_LT(start_offset_, dex_file->Size());
DCHECK_LE(end_offset_, dex_file->Size());
MadviseLargestPageAlignedRegion(dex_file->Begin() + start_offset_,
dex_file->Begin() + end_offset_,
advice);
}
void DexLayoutSections::MadviseAtLoad(const DexFile* dex_file) const {
#ifdef _WIN32
UNUSED(dex_file);
PLOG(WARNING) << "madvise is unsupported on Windows.";
#else
// The dex file is already defaulted to random access everywhere.
for (const DexLayoutSection& section : sections_) {
section.parts_[static_cast<size_t>(LayoutType::kLayoutTypeStartupOnly)].Madvise(
dex_file,
MADV_WILLNEED);
section.parts_[static_cast<size_t>(LayoutType::kLayoutTypeHot)].Madvise(
dex_file,
MADV_WILLNEED);
}
#endif
}
std::ostream& operator<<(std::ostream& os, const DexLayoutSection& section) {
for (size_t i = 0; i < static_cast<size_t>(LayoutType::kLayoutTypeCount); ++i) {
const DexLayoutSection::Subsection& part = section.parts_[i];
os << static_cast<LayoutType>(i) << "("
<< part.start_offset_ << "-" << part.end_offset_ << ") ";
}
return os;
}
std::ostream& operator<<(std::ostream& os, const DexLayoutSections& sections) {
for (size_t i = 0; i < static_cast<size_t>(DexLayoutSections::SectionType::kSectionCount); ++i) {
os << static_cast<DexLayoutSections::SectionType>(i) << ":" << sections.sections_[i] << "\n";
}
return os;
}
} // namespace art