118 lines
4.0 KiB
C++
118 lines
4.0 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_LIBDEXFILE_DEX_DEX_FILE_LAYOUT_H_
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#define ART_LIBDEXFILE_DEX_DEX_FILE_LAYOUT_H_
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#include <algorithm>
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#include <cstdint>
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#include <iosfwd>
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#include <android-base/logging.h>
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namespace art {
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class DexFile;
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enum class LayoutType : uint8_t {
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// Layout of things that are hot (commonly accessed), these should be pinned or madvised will
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// need.
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kLayoutTypeHot,
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// Layout of things that are randomly used. These should be advised to random access.
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// Without layout, this is the default mode when loading a dex file.
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kLayoutTypeSometimesUsed,
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// Layout of things that are only used during startup, these can be madvised after launch.
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kLayoutTypeStartupOnly,
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// Layout of things that are needed probably only once (class initializers). These can be
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// madvised during trim events.
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kLayoutTypeUsedOnce,
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// Layout of things that are thought to be unused. These things should be advised to random
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// access.
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kLayoutTypeUnused,
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// Unused value, just the number of elements in the enum.
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kLayoutTypeCount,
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};
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std::ostream& operator<<(std::ostream& os, LayoutType collector_type);
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// Return the "best" layout option if the same item has multiple different layouts.
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static inline LayoutType MergeLayoutType(LayoutType a, LayoutType b) {
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return std::min(a, b);
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}
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// A dex layout section such as code items or strings. Each section is composed of subsections
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// that are laid out adjacently to each other such as (hot, unused, startup, etc...).
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class DexLayoutSection {
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public:
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// A subsection is a a continuous range of dex file that is all part of the same layout hint.
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class Subsection {
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public:
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// Use uint32_t to handle 32/64 bit cross compilation.
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uint32_t start_offset_ = 0u;
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uint32_t end_offset_ = 0u;
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bool Contains(uint32_t offset) const {
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return start_offset_ <= offset && offset < end_offset_;
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}
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bool Size() const {
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DCHECK_LE(start_offset_, end_offset_);
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return end_offset_ - start_offset_;
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}
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void CombineSection(uint32_t start_offset, uint32_t end_offset) {
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DCHECK_LE(start_offset, end_offset);
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if (start_offset_ == end_offset_) {
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start_offset_ = start_offset;
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end_offset_ = end_offset;
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} else {
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start_offset_ = std::min(start_offset_, start_offset);
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end_offset_ = std::max(end_offset_, end_offset);
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}
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}
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void Madvise(const DexFile* dex_file, int advice) const;
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};
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// Madvise the largest page-aligned region contained in [begin, end).
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static int MadviseLargestPageAlignedRegion(const uint8_t* begin, const uint8_t* end, int advice);
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Subsection parts_[static_cast<size_t>(LayoutType::kLayoutTypeCount)];
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};
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// A set of dex layout sections, currently there is only one section for code and one for strings.
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class DexLayoutSections {
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public:
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enum class SectionType : uint8_t {
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kSectionTypeCode,
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kSectionTypeStrings,
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kSectionCount,
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};
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// Advise load access about the dex file based on layout. The caller is expected to have already
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// madvised to MADV_RANDOM.
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void MadviseAtLoad(const DexFile* dex_file) const;
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DexLayoutSection sections_[static_cast<size_t>(SectionType::kSectionCount)];
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};
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std::ostream& operator<<(std::ostream& os, DexLayoutSections::SectionType collector_type);
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std::ostream& operator<<(std::ostream& os, const DexLayoutSection& section);
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std::ostream& operator<<(std::ostream& os, const DexLayoutSections& sections);
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} // namespace art
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#endif // ART_LIBDEXFILE_DEX_DEX_FILE_LAYOUT_H_
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