616 lines
24 KiB
C++
616 lines
24 KiB
C++
/*
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* Copyright (C) 2015 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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#include "oat_file_manager.h"
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#include <memory>
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#include <queue>
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#include <vector>
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#include "android-base/stringprintf.h"
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#include "art_field-inl.h"
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#include "base/bit_vector-inl.h"
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#include "base/logging.h"
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#include "base/stl_util.h"
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#include "base/systrace.h"
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#include "class_linker.h"
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#include "class_loader_context.h"
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#include "dex_file-inl.h"
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#include "dex_file_tracking_registrar.h"
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#include "gc/scoped_gc_critical_section.h"
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#include "gc/space/image_space.h"
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#include "handle_scope-inl.h"
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#include "jni_internal.h"
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#include "mirror/class_loader.h"
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#include "mirror/object-inl.h"
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#include "oat_file_assistant.h"
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#include "obj_ptr-inl.h"
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#include "scoped_thread_state_change-inl.h"
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#include "thread-current-inl.h"
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#include "thread_list.h"
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#include "well_known_classes.h"
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namespace art {
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using android::base::StringPrintf;
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// If true, we attempt to load the application image if it exists.
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static constexpr bool kEnableAppImage = true;
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const OatFile* OatFileManager::RegisterOatFile(std::unique_ptr<const OatFile> oat_file) {
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WriterMutexLock mu(Thread::Current(), *Locks::oat_file_manager_lock_);
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DCHECK(oat_file != nullptr);
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if (kIsDebugBuild) {
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CHECK(oat_files_.find(oat_file) == oat_files_.end());
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for (const std::unique_ptr<const OatFile>& existing : oat_files_) {
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CHECK_NE(oat_file.get(), existing.get()) << oat_file->GetLocation();
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// Check that we don't have an oat file with the same address. Copies of the same oat file
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// should be loaded at different addresses.
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CHECK_NE(oat_file->Begin(), existing->Begin()) << "Oat file already mapped at that location";
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}
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}
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have_non_pic_oat_file_ = have_non_pic_oat_file_ || !oat_file->IsPic();
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const OatFile* ret = oat_file.get();
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oat_files_.insert(std::move(oat_file));
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return ret;
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}
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void OatFileManager::UnRegisterAndDeleteOatFile(const OatFile* oat_file) {
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WriterMutexLock mu(Thread::Current(), *Locks::oat_file_manager_lock_);
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DCHECK(oat_file != nullptr);
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std::unique_ptr<const OatFile> compare(oat_file);
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auto it = oat_files_.find(compare);
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CHECK(it != oat_files_.end());
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oat_files_.erase(it);
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compare.release();
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}
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const OatFile* OatFileManager::FindOpenedOatFileFromDexLocation(
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const std::string& dex_base_location) const {
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ReaderMutexLock mu(Thread::Current(), *Locks::oat_file_manager_lock_);
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for (const std::unique_ptr<const OatFile>& oat_file : oat_files_) {
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const std::vector<const OatDexFile*>& oat_dex_files = oat_file->GetOatDexFiles();
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for (const OatDexFile* oat_dex_file : oat_dex_files) {
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if (DexFile::GetBaseLocation(oat_dex_file->GetDexFileLocation()) == dex_base_location) {
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return oat_file.get();
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}
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}
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}
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return nullptr;
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}
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const OatFile* OatFileManager::FindOpenedOatFileFromOatLocation(const std::string& oat_location)
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const {
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ReaderMutexLock mu(Thread::Current(), *Locks::oat_file_manager_lock_);
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return FindOpenedOatFileFromOatLocationLocked(oat_location);
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}
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const OatFile* OatFileManager::FindOpenedOatFileFromOatLocationLocked(
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const std::string& oat_location) const {
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for (const std::unique_ptr<const OatFile>& oat_file : oat_files_) {
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if (oat_file->GetLocation() == oat_location) {
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return oat_file.get();
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}
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}
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return nullptr;
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}
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std::vector<const OatFile*> OatFileManager::GetBootOatFiles() const {
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std::vector<const OatFile*> oat_files;
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std::vector<gc::space::ImageSpace*> image_spaces =
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Runtime::Current()->GetHeap()->GetBootImageSpaces();
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for (gc::space::ImageSpace* image_space : image_spaces) {
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oat_files.push_back(image_space->GetOatFile());
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}
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return oat_files;
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}
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const OatFile* OatFileManager::GetPrimaryOatFile() const {
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ReaderMutexLock mu(Thread::Current(), *Locks::oat_file_manager_lock_);
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std::vector<const OatFile*> boot_oat_files = GetBootOatFiles();
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if (!boot_oat_files.empty()) {
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for (const std::unique_ptr<const OatFile>& oat_file : oat_files_) {
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if (std::find(boot_oat_files.begin(), boot_oat_files.end(), oat_file.get()) ==
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boot_oat_files.end()) {
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return oat_file.get();
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}
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}
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}
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return nullptr;
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}
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OatFileManager::~OatFileManager() {
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// Explicitly clear oat_files_ since the OatFile destructor calls back into OatFileManager for
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// UnRegisterOatFileLocation.
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oat_files_.clear();
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}
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std::vector<const OatFile*> OatFileManager::RegisterImageOatFiles(
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std::vector<gc::space::ImageSpace*> spaces) {
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std::vector<const OatFile*> oat_files;
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for (gc::space::ImageSpace* space : spaces) {
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oat_files.push_back(RegisterOatFile(space->ReleaseOatFile()));
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}
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return oat_files;
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}
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class TypeIndexInfo {
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public:
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explicit TypeIndexInfo(const DexFile* dex_file)
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: type_indexes_(GenerateTypeIndexes(dex_file)),
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iter_(type_indexes_.Indexes().begin()),
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end_(type_indexes_.Indexes().end()) { }
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BitVector& GetTypeIndexes() {
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return type_indexes_;
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}
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BitVector::IndexIterator& GetIterator() {
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return iter_;
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}
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BitVector::IndexIterator& GetIteratorEnd() {
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return end_;
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}
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void AdvanceIterator() {
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iter_++;
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}
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private:
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static BitVector GenerateTypeIndexes(const DexFile* dex_file) {
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BitVector type_indexes(/*start_bits*/0, /*expandable*/true, Allocator::GetMallocAllocator());
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for (uint16_t i = 0; i < dex_file->NumClassDefs(); ++i) {
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const DexFile::ClassDef& class_def = dex_file->GetClassDef(i);
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uint16_t type_idx = class_def.class_idx_.index_;
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type_indexes.SetBit(type_idx);
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}
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return type_indexes;
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}
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// BitVector with bits set for the type indexes of all classes in the input dex file.
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BitVector type_indexes_;
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BitVector::IndexIterator iter_;
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BitVector::IndexIterator end_;
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};
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class DexFileAndClassPair : ValueObject {
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public:
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DexFileAndClassPair(const DexFile* dex_file, TypeIndexInfo* type_info, bool from_loaded_oat)
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: type_info_(type_info),
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dex_file_(dex_file),
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cached_descriptor_(dex_file_->StringByTypeIdx(dex::TypeIndex(*type_info->GetIterator()))),
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from_loaded_oat_(from_loaded_oat) {
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type_info_->AdvanceIterator();
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}
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DexFileAndClassPair(const DexFileAndClassPair& rhs) = default;
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DexFileAndClassPair& operator=(const DexFileAndClassPair& rhs) = default;
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const char* GetCachedDescriptor() const {
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return cached_descriptor_;
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}
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bool operator<(const DexFileAndClassPair& rhs) const {
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const int cmp = strcmp(cached_descriptor_, rhs.cached_descriptor_);
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if (cmp != 0) {
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// Note that the order must be reversed. We want to iterate over the classes in dex files.
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// They are sorted lexicographically. Thus, the priority-queue must be a min-queue.
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return cmp > 0;
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}
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return dex_file_ < rhs.dex_file_;
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}
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bool DexFileHasMoreClasses() const {
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return type_info_->GetIterator() != type_info_->GetIteratorEnd();
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}
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void Next() {
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cached_descriptor_ = dex_file_->StringByTypeIdx(dex::TypeIndex(*type_info_->GetIterator()));
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type_info_->AdvanceIterator();
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}
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bool FromLoadedOat() const {
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return from_loaded_oat_;
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}
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const DexFile* GetDexFile() const {
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return dex_file_;
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}
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private:
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TypeIndexInfo* type_info_;
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const DexFile* dex_file_;
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const char* cached_descriptor_;
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bool from_loaded_oat_; // We only need to compare mismatches between what we load now
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// and what was loaded before. Any old duplicates must have been
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// OK, and any new "internal" duplicates are as well (they must
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// be from multidex, which resolves correctly).
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};
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static void AddDexFilesFromOat(
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const OatFile* oat_file,
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/*out*/std::vector<const DexFile*>* dex_files,
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std::vector<std::unique_ptr<const DexFile>>* opened_dex_files) {
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for (const OatDexFile* oat_dex_file : oat_file->GetOatDexFiles()) {
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std::string error;
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std::unique_ptr<const DexFile> dex_file = oat_dex_file->OpenDexFile(&error);
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if (dex_file == nullptr) {
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LOG(WARNING) << "Could not create dex file from oat file: " << error;
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} else if (dex_file->NumClassDefs() > 0U) {
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dex_files->push_back(dex_file.get());
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opened_dex_files->push_back(std::move(dex_file));
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}
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}
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}
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static void AddNext(/*inout*/DexFileAndClassPair& original,
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/*inout*/std::priority_queue<DexFileAndClassPair>& heap) {
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if (original.DexFileHasMoreClasses()) {
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original.Next();
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heap.push(std::move(original));
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}
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}
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static bool CollisionCheck(std::vector<const DexFile*>& dex_files_loaded,
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std::vector<const DexFile*>& dex_files_unloaded,
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std::string* error_msg /*out*/) {
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// Generate type index information for each dex file.
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std::vector<TypeIndexInfo> loaded_types;
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for (const DexFile* dex_file : dex_files_loaded) {
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loaded_types.push_back(TypeIndexInfo(dex_file));
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}
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std::vector<TypeIndexInfo> unloaded_types;
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for (const DexFile* dex_file : dex_files_unloaded) {
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unloaded_types.push_back(TypeIndexInfo(dex_file));
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}
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// Populate the queue of dex file and class pairs with the loaded and unloaded dex files.
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std::priority_queue<DexFileAndClassPair> queue;
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for (size_t i = 0; i < dex_files_loaded.size(); ++i) {
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if (loaded_types[i].GetIterator() != loaded_types[i].GetIteratorEnd()) {
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queue.emplace(dex_files_loaded[i], &loaded_types[i], /*from_loaded_oat*/true);
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}
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}
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for (size_t i = 0; i < dex_files_unloaded.size(); ++i) {
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if (unloaded_types[i].GetIterator() != unloaded_types[i].GetIteratorEnd()) {
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queue.emplace(dex_files_unloaded[i], &unloaded_types[i], /*from_loaded_oat*/false);
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}
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}
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// Now drain the queue.
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bool has_duplicates = false;
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error_msg->clear();
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while (!queue.empty()) {
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// Modifying the top element is only safe if we pop right after.
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DexFileAndClassPair compare_pop(queue.top());
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queue.pop();
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// Compare against the following elements.
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while (!queue.empty()) {
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DexFileAndClassPair top(queue.top());
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if (strcmp(compare_pop.GetCachedDescriptor(), top.GetCachedDescriptor()) == 0) {
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// Same descriptor. Check whether it's crossing old-oat-files to new-oat-files.
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if (compare_pop.FromLoadedOat() != top.FromLoadedOat()) {
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error_msg->append(
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StringPrintf("Found duplicated class when checking oat files: '%s' in %s and %s\n",
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compare_pop.GetCachedDescriptor(),
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compare_pop.GetDexFile()->GetLocation().c_str(),
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top.GetDexFile()->GetLocation().c_str()));
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if (!VLOG_IS_ON(oat)) {
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return true;
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}
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has_duplicates = true;
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}
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queue.pop();
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AddNext(top, queue);
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} else {
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// Something else. Done here.
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break;
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}
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}
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AddNext(compare_pop, queue);
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}
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return has_duplicates;
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}
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// Check for class-def collisions in dex files.
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//
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// This first walks the class loader chain present in the given context, getting all the dex files
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// from the class loader.
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//
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// If the context is null (which means the initial class loader was null or unsupported)
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// this returns false. b/37777332.
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//
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// This first checks whether all class loaders in the context have the same type and
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// classpath. If so, we exit early. Otherwise, we do the collision check.
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//
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// The collision check works by maintaining a heap with one class from each dex file, sorted by the
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// class descriptor. Then a dex-file/class pair is continually removed from the heap and compared
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// against the following top element. If the descriptor is the same, it is now checked whether
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// the two elements agree on whether their dex file was from an already-loaded oat-file or the
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// new oat file. Any disagreement indicates a collision.
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bool OatFileManager::HasCollisions(const OatFile* oat_file,
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const ClassLoaderContext* context,
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std::string* error_msg /*out*/) const {
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DCHECK(oat_file != nullptr);
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DCHECK(error_msg != nullptr);
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// The context might be null if there are unrecognized class loaders in the chain or they
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// don't meet sensible sanity conditions. In this case we assume that the app knows what it's
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// doing and accept the oat file.
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// Note that this has correctness implications as we cannot guarantee that the class resolution
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// used during compilation is OK (b/37777332).
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if (context == nullptr) {
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LOG(WARNING) << "Skipping duplicate class check due to unsupported classloader";
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return false;
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}
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// If the pat file loading context matches the context used during compilation then we accept
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// the oat file without addition checks
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if (context->VerifyClassLoaderContextMatch(oat_file->GetClassLoaderContext())) {
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return false;
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}
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// The class loader context does not match. Perform a full duplicate classes check.
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std::vector<const DexFile*> dex_files_loaded = context->FlattenOpenedDexFiles();
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// Vector that holds the newly opened dex files live, this is done to prevent leaks.
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std::vector<std::unique_ptr<const DexFile>> opened_dex_files;
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ScopedTrace st("Collision check");
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// Add dex files from the oat file to check.
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std::vector<const DexFile*> dex_files_unloaded;
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AddDexFilesFromOat(oat_file, &dex_files_unloaded, &opened_dex_files);
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return CollisionCheck(dex_files_loaded, dex_files_unloaded, error_msg);
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}
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std::vector<std::unique_ptr<const DexFile>> OatFileManager::OpenDexFilesFromOat(
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const char* dex_location,
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jobject class_loader,
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jobjectArray dex_elements,
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const OatFile** out_oat_file,
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std::vector<std::string>* error_msgs) {
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ScopedTrace trace(__FUNCTION__);
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CHECK(dex_location != nullptr);
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CHECK(error_msgs != nullptr);
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// Verify we aren't holding the mutator lock, which could starve GC if we
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// have to generate or relocate an oat file.
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Thread* const self = Thread::Current();
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Locks::mutator_lock_->AssertNotHeld(self);
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Runtime* const runtime = Runtime::Current();
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std::unique_ptr<ClassLoaderContext> context;
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// If the class_loader is null there's not much we can do. This happens if a dex files is loaded
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// directly with DexFile APIs instead of using class loaders.
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if (class_loader == nullptr) {
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LOG(WARNING) << "Opening an oat file without a class loader. "
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<< "Are you using the deprecated DexFile APIs?";
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context = nullptr;
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} else {
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context = ClassLoaderContext::CreateContextForClassLoader(class_loader, dex_elements);
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}
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OatFileAssistant oat_file_assistant(dex_location,
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kRuntimeISA,
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!runtime->IsAotCompiler());
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// Lock the target oat location to avoid races generating and loading the
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// oat file.
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std::string error_msg;
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if (!oat_file_assistant.Lock(/*out*/&error_msg)) {
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// Don't worry too much if this fails. If it does fail, it's unlikely we
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// can generate an oat file anyway.
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VLOG(class_linker) << "OatFileAssistant::Lock: " << error_msg;
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}
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const OatFile* source_oat_file = nullptr;
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if (!oat_file_assistant.IsUpToDate()) {
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// Update the oat file on disk if we can, based on the --compiler-filter
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// option derived from the current runtime options.
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// This may fail, but that's okay. Best effort is all that matters here.
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// TODO(calin): b/64530081 b/66984396. Pass a null context to verify and compile
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// secondary dex files in isolation (and avoid to extract/verify the main apk
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// if it's in the class path). Note this trades correctness for performance
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// since the resulting slow down is unacceptable in some cases until b/64530081
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// is fixed.
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switch (oat_file_assistant.MakeUpToDate(/*profile_changed*/ false,
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/*class_loader_context*/ nullptr,
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/*out*/ &error_msg)) {
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case OatFileAssistant::kUpdateFailed:
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LOG(WARNING) << error_msg;
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break;
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case OatFileAssistant::kUpdateNotAttempted:
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// Avoid spamming the logs if we decided not to attempt making the oat
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// file up to date.
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VLOG(oat) << error_msg;
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break;
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case OatFileAssistant::kUpdateSucceeded:
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// Nothing to do.
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break;
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}
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}
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// Get the oat file on disk.
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std::unique_ptr<const OatFile> oat_file(oat_file_assistant.GetBestOatFile().release());
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// Prevent oat files from being loaded if no class_loader or dex_elements are provided.
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// This can happen when the deprecated DexFile.<init>(String) is called directly, and it
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// could load oat files without checking the classpath, which would be incorrect.
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if ((class_loader != nullptr || dex_elements != nullptr) && oat_file != nullptr) {
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// Take the file only if it has no collisions, or we must take it because of preopting.
|
|
bool accept_oat_file =
|
|
!HasCollisions(oat_file.get(), context.get(), /*out*/ &error_msg);
|
|
if (!accept_oat_file) {
|
|
// Failed the collision check. Print warning.
|
|
if (Runtime::Current()->IsDexFileFallbackEnabled()) {
|
|
if (!oat_file_assistant.HasOriginalDexFiles()) {
|
|
// We need to fallback but don't have original dex files. We have to
|
|
// fallback to opening the existing oat file. This is potentially
|
|
// unsafe so we warn about it.
|
|
accept_oat_file = true;
|
|
|
|
LOG(WARNING) << "Dex location " << dex_location << " does not seem to include dex file. "
|
|
<< "Allow oat file use. This is potentially dangerous.";
|
|
} else {
|
|
// We have to fallback and found original dex files - extract them from an APK.
|
|
// Also warn about this operation because it's potentially wasteful.
|
|
LOG(WARNING) << "Found duplicate classes, falling back to extracting from APK : "
|
|
<< dex_location;
|
|
LOG(WARNING) << "NOTE: This wastes RAM and hurts startup performance.";
|
|
}
|
|
} else {
|
|
// TODO: We should remove this. The fact that we're here implies -Xno-dex-file-fallback
|
|
// was set, which means that we should never fallback. If we don't have original dex
|
|
// files, we should just fail resolution as the flag intended.
|
|
if (!oat_file_assistant.HasOriginalDexFiles()) {
|
|
accept_oat_file = true;
|
|
}
|
|
|
|
LOG(WARNING) << "Found duplicate classes, dex-file-fallback disabled, will be failing to "
|
|
" load classes for " << dex_location;
|
|
}
|
|
|
|
LOG(WARNING) << error_msg;
|
|
}
|
|
|
|
if (accept_oat_file) {
|
|
VLOG(class_linker) << "Registering " << oat_file->GetLocation();
|
|
source_oat_file = RegisterOatFile(std::move(oat_file));
|
|
*out_oat_file = source_oat_file;
|
|
}
|
|
}
|
|
|
|
std::vector<std::unique_ptr<const DexFile>> dex_files;
|
|
|
|
// Load the dex files from the oat file.
|
|
if (source_oat_file != nullptr) {
|
|
bool added_image_space = false;
|
|
if (source_oat_file->IsExecutable()) {
|
|
std::unique_ptr<gc::space::ImageSpace> image_space =
|
|
kEnableAppImage ? oat_file_assistant.OpenImageSpace(source_oat_file) : nullptr;
|
|
if (image_space != nullptr) {
|
|
ScopedObjectAccess soa(self);
|
|
StackHandleScope<1> hs(self);
|
|
Handle<mirror::ClassLoader> h_loader(
|
|
hs.NewHandle(soa.Decode<mirror::ClassLoader>(class_loader)));
|
|
// Can not load app image without class loader.
|
|
if (h_loader != nullptr) {
|
|
std::string temp_error_msg;
|
|
// Add image space has a race condition since other threads could be reading from the
|
|
// spaces array.
|
|
{
|
|
ScopedThreadSuspension sts(self, kSuspended);
|
|
gc::ScopedGCCriticalSection gcs(self,
|
|
gc::kGcCauseAddRemoveAppImageSpace,
|
|
gc::kCollectorTypeAddRemoveAppImageSpace);
|
|
ScopedSuspendAll ssa("Add image space");
|
|
runtime->GetHeap()->AddSpace(image_space.get());
|
|
}
|
|
{
|
|
ScopedTrace trace2(StringPrintf("Adding image space for location %s", dex_location));
|
|
added_image_space = runtime->GetClassLinker()->AddImageSpace(image_space.get(),
|
|
h_loader,
|
|
dex_elements,
|
|
dex_location,
|
|
/*out*/&dex_files,
|
|
/*out*/&temp_error_msg);
|
|
}
|
|
if (added_image_space) {
|
|
// Successfully added image space to heap, release the map so that it does not get
|
|
// freed.
|
|
image_space.release();
|
|
|
|
// Register for tracking.
|
|
for (const auto& dex_file : dex_files) {
|
|
dex::tracking::RegisterDexFile(dex_file.get());
|
|
}
|
|
} else {
|
|
LOG(INFO) << "Failed to add image file " << temp_error_msg;
|
|
dex_files.clear();
|
|
{
|
|
ScopedThreadSuspension sts(self, kSuspended);
|
|
gc::ScopedGCCriticalSection gcs(self,
|
|
gc::kGcCauseAddRemoveAppImageSpace,
|
|
gc::kCollectorTypeAddRemoveAppImageSpace);
|
|
ScopedSuspendAll ssa("Remove image space");
|
|
runtime->GetHeap()->RemoveSpace(image_space.get());
|
|
}
|
|
// Non-fatal, don't update error_msg.
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (!added_image_space) {
|
|
DCHECK(dex_files.empty());
|
|
dex_files = oat_file_assistant.LoadDexFiles(*source_oat_file, dex_location);
|
|
|
|
// Register for tracking.
|
|
for (const auto& dex_file : dex_files) {
|
|
dex::tracking::RegisterDexFile(dex_file.get());
|
|
}
|
|
}
|
|
if (dex_files.empty()) {
|
|
error_msgs->push_back("Failed to open dex files from " + source_oat_file->GetLocation());
|
|
} else {
|
|
// Opened dex files from an oat file, madvise them to their loaded state.
|
|
for (const std::unique_ptr<const DexFile>& dex_file : dex_files) {
|
|
OatDexFile::MadviseDexFile(*dex_file, MadviseState::kMadviseStateAtLoad);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Fall back to running out of the original dex file if we couldn't load any
|
|
// dex_files from the oat file.
|
|
if (dex_files.empty()) {
|
|
if (oat_file_assistant.HasOriginalDexFiles()) {
|
|
if (Runtime::Current()->IsDexFileFallbackEnabled()) {
|
|
static constexpr bool kVerifyChecksum = true;
|
|
if (!DexFile::Open(
|
|
dex_location, dex_location, kVerifyChecksum, /*out*/ &error_msg, &dex_files)) {
|
|
LOG(WARNING) << error_msg;
|
|
error_msgs->push_back("Failed to open dex files from " + std::string(dex_location)
|
|
+ " because: " + error_msg);
|
|
}
|
|
} else {
|
|
error_msgs->push_back("Fallback mode disabled, skipping dex files.");
|
|
}
|
|
} else {
|
|
error_msgs->push_back("No original dex files found for dex location "
|
|
+ std::string(dex_location));
|
|
}
|
|
}
|
|
|
|
return dex_files;
|
|
}
|
|
|
|
void OatFileManager::DumpForSigQuit(std::ostream& os) {
|
|
ReaderMutexLock mu(Thread::Current(), *Locks::oat_file_manager_lock_);
|
|
std::vector<const OatFile*> boot_oat_files = GetBootOatFiles();
|
|
for (const std::unique_ptr<const OatFile>& oat_file : oat_files_) {
|
|
if (ContainsElement(boot_oat_files, oat_file.get())) {
|
|
continue;
|
|
}
|
|
os << oat_file->GetLocation() << ": " << oat_file->GetCompilerFilter() << "\n";
|
|
}
|
|
}
|
|
|
|
} // namespace art
|