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/*
* Copyright (C) 2014 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 "oat_file_assistant.h"
#include <sstream>
#include <sys/stat.h>
#include "zlib.h"
#include "android-base/file.h"
#include "android-base/stringprintf.h"
#include "android-base/strings.h"
#include "base/compiler_filter.h"
#include "base/file_utils.h"
#include "base/logging.h" // For VLOG.
#include "base/macros.h"
#include "base/os.h"
#include "base/stl_util.h"
#include "base/string_view_cpp20.h"
#include "base/systrace.h"
#include "base/utils.h"
#include "base/zip_archive.h"
#include "class_linker.h"
#include "class_loader_context.h"
#include "dex/art_dex_file_loader.h"
#include "dex/dex_file_loader.h"
#include "exec_utils.h"
#include "gc/heap.h"
#include "gc/space/image_space.h"
#include "image.h"
#include "oat.h"
#include "runtime.h"
#include "scoped_thread_state_change-inl.h"
#include "vdex_file.h"
namespace art {
using android::base::StringPrintf;
static constexpr const char* kAnonymousDexPrefix = "Anonymous-DexFile@";
static constexpr const char* kVdexExtension = ".vdex";
static constexpr const char* kDmExtension = ".dm";
std::ostream& operator << (std::ostream& stream, const OatFileAssistant::OatStatus status) {
switch (status) {
case OatFileAssistant::kOatCannotOpen:
stream << "kOatCannotOpen";
break;
case OatFileAssistant::kOatDexOutOfDate:
stream << "kOatDexOutOfDate";
break;
case OatFileAssistant::kOatBootImageOutOfDate:
stream << "kOatBootImageOutOfDate";
break;
case OatFileAssistant::kOatUpToDate:
stream << "kOatUpToDate";
break;
case OatFileAssistant::kOatContextOutOfDate:
stream << "kOaContextOutOfDate";
break;
}
return stream;
}
OatFileAssistant::OatFileAssistant(const char* dex_location,
const InstructionSet isa,
ClassLoaderContext* context,
bool load_executable,
bool only_load_trusted_executable)
: OatFileAssistant(dex_location,
isa,
context,
load_executable,
only_load_trusted_executable,
/*vdex_fd=*/ -1,
/*oat_fd=*/ -1,
/*zip_fd=*/ -1) {}
OatFileAssistant::OatFileAssistant(const char* dex_location,
const InstructionSet isa,
ClassLoaderContext* context,
bool load_executable,
bool only_load_trusted_executable,
int vdex_fd,
int oat_fd,
int zip_fd)
: context_(context),
isa_(isa),
load_executable_(load_executable),
only_load_trusted_executable_(only_load_trusted_executable),
odex_(this, /*is_oat_location=*/ false),
oat_(this, /*is_oat_location=*/ true),
vdex_for_odex_(this, /*is_oat_location=*/ false),
vdex_for_oat_(this, /*is_oat_location=*/ true),
dm_for_odex_(this, /*is_oat_location=*/ false),
dm_for_oat_(this, /*is_oat_location=*/ true),
zip_fd_(zip_fd) {
CHECK(dex_location != nullptr) << "OatFileAssistant: null dex location";
CHECK_IMPLIES(load_executable, context != nullptr) << "Loading executable without a context";
if (zip_fd < 0) {
CHECK_LE(oat_fd, 0) << "zip_fd must be provided with valid oat_fd. zip_fd=" << zip_fd
<< " oat_fd=" << oat_fd;
CHECK_LE(vdex_fd, 0) << "zip_fd must be provided with valid vdex_fd. zip_fd=" << zip_fd
<< " vdex_fd=" << vdex_fd;;
CHECK(!UseFdToReadFiles());
} else {
CHECK(UseFdToReadFiles());
}
dex_location_.assign(dex_location);
if (load_executable_ && isa != kRuntimeISA) {
LOG(WARNING) << "OatFileAssistant: Load executable specified, "
<< "but isa is not kRuntimeISA. Will not attempt to load executable.";
load_executable_ = false;
}
// Get the odex filename.
std::string error_msg;
std::string odex_file_name;
if (DexLocationToOdexFilename(dex_location_, isa_, &odex_file_name, &error_msg)) {
odex_.Reset(odex_file_name, UseFdToReadFiles(), zip_fd, vdex_fd, oat_fd);
std::string vdex_file_name = GetVdexFilename(odex_file_name);
// We dup FDs as the odex_ will claim ownership.
vdex_for_odex_.Reset(vdex_file_name,
UseFdToReadFiles(),
DupCloexec(zip_fd),
DupCloexec(vdex_fd),
DupCloexec(oat_fd));
std::string dm_file_name = GetDmFilename(dex_location_);
dm_for_odex_.Reset(dm_file_name,
UseFdToReadFiles(),
DupCloexec(zip_fd),
DupCloexec(vdex_fd),
DupCloexec(oat_fd));
} else {
LOG(WARNING) << "Failed to determine odex file name: " << error_msg;
}
if (!UseFdToReadFiles()) {
// Get the oat filename.
std::string oat_file_name;
if (DexLocationToOatFilename(dex_location_, isa_, &oat_file_name, &error_msg)) {
oat_.Reset(oat_file_name, /*use_fd=*/ false);
std::string vdex_file_name = GetVdexFilename(oat_file_name);
vdex_for_oat_.Reset(vdex_file_name, UseFdToReadFiles(), zip_fd, vdex_fd, oat_fd);
std::string dm_file_name = GetDmFilename(dex_location);
dm_for_oat_.Reset(dm_file_name, UseFdToReadFiles(), zip_fd, vdex_fd, oat_fd);
} else {
LOG(WARNING) << "Failed to determine oat file name for dex location "
<< dex_location_ << ": " << error_msg;
}
}
// Check if the dex directory is writable.
// This will be needed in most uses of OatFileAssistant and so it's OK to
// compute it eagerly. (the only use which will not make use of it is
// OatFileAssistant::GetStatusDump())
size_t pos = dex_location_.rfind('/');
if (pos == std::string::npos) {
LOG(WARNING) << "Failed to determine dex file parent directory: " << dex_location_;
} else if (!UseFdToReadFiles()) {
// We cannot test for parent access when using file descriptors. That's ok
// because in this case we will always pick the odex file anyway.
std::string parent = dex_location_.substr(0, pos);
if (access(parent.c_str(), W_OK) == 0) {
dex_parent_writable_ = true;
} else {
VLOG(oat) << "Dex parent of " << dex_location_ << " is not writable: " << strerror(errno);
}
}
}
bool OatFileAssistant::UseFdToReadFiles() {
return zip_fd_ >= 0;
}
bool OatFileAssistant::IsInBootClassPath() {
// Note: We check the current boot class path, regardless of the ISA
// specified by the user. This is okay, because the boot class path should
// be the same for all ISAs.
// TODO: Can we verify the boot class path is the same for all ISAs?
Runtime* runtime = Runtime::Current();
ClassLinker* class_linker = runtime->GetClassLinker();
const auto& boot_class_path = class_linker->GetBootClassPath();
for (size_t i = 0; i < boot_class_path.size(); i++) {
if (boot_class_path[i]->GetLocation() == dex_location_) {
VLOG(oat) << "Dex location " << dex_location_ << " is in boot class path";
return true;
}
}
return false;
}
int OatFileAssistant::GetDexOptNeeded(CompilerFilter::Filter target,
bool profile_changed,
bool downgrade) {
OatFileInfo& info = GetBestInfo();
DexOptNeeded dexopt_needed = info.GetDexOptNeeded(target,
profile_changed,
downgrade);
if (info.IsOatLocation() || dexopt_needed == kDex2OatFromScratch) {
return dexopt_needed;
}
return -dexopt_needed;
}
bool OatFileAssistant::IsUpToDate() {
return GetBestInfo().Status() == kOatUpToDate;
}
std::unique_ptr<OatFile> OatFileAssistant::GetBestOatFile() {
return GetBestInfo().ReleaseFileForUse();
}
std::string OatFileAssistant::GetStatusDump() {
std::ostringstream status;
bool oat_file_exists = false;
bool odex_file_exists = false;
if (oat_.Status() != kOatCannotOpen) {
// If we can open the file, Filename should not return null.
CHECK(oat_.Filename() != nullptr);
oat_file_exists = true;
status << *oat_.Filename() << "[status=" << oat_.Status() << ", ";
const OatFile* file = oat_.GetFile();
if (file == nullptr) {
// If the file is null even though the status is not kOatCannotOpen, it
// means we must have a vdex file with no corresponding oat file. In
// this case we cannot determine the compilation filter. Indicate that
// we have only the vdex file instead.
status << "vdex-only";
} else {
status << "compilation_filter=" << CompilerFilter::NameOfFilter(file->GetCompilerFilter());
}
}
if (odex_.Status() != kOatCannotOpen) {
// If we can open the file, Filename should not return null.
CHECK(odex_.Filename() != nullptr);
odex_file_exists = true;
if (oat_file_exists) {
status << "] ";
}
status << *odex_.Filename() << "[status=" << odex_.Status() << ", ";
const OatFile* file = odex_.GetFile();
if (file == nullptr) {
status << "vdex-only";
} else {
status << "compilation_filter=" << CompilerFilter::NameOfFilter(file->GetCompilerFilter());
}
}
if (!oat_file_exists && !odex_file_exists) {
status << "invalid[";
}
status << "]";
return status.str();
}
std::vector<std::unique_ptr<const DexFile>> OatFileAssistant::LoadDexFiles(
const OatFile &oat_file, const char *dex_location) {
std::vector<std::unique_ptr<const DexFile>> dex_files;
if (LoadDexFiles(oat_file, dex_location, &dex_files)) {
return dex_files;
} else {
return std::vector<std::unique_ptr<const DexFile>>();
}
}
bool OatFileAssistant::LoadDexFiles(
const OatFile &oat_file,
const std::string& dex_location,
std::vector<std::unique_ptr<const DexFile>>* out_dex_files) {
// Load the main dex file.
std::string error_msg;
const OatDexFile* oat_dex_file = oat_file.GetOatDexFile(
dex_location.c_str(), nullptr, &error_msg);
if (oat_dex_file == nullptr) {
LOG(WARNING) << error_msg;
return false;
}
std::unique_ptr<const DexFile> dex_file = oat_dex_file->OpenDexFile(&error_msg);
if (dex_file.get() == nullptr) {
LOG(WARNING) << "Failed to open dex file from oat dex file: " << error_msg;
return false;
}
out_dex_files->push_back(std::move(dex_file));
// Load the rest of the multidex entries
for (size_t i = 1;; i++) {
std::string multidex_dex_location = DexFileLoader::GetMultiDexLocation(i, dex_location.c_str());
oat_dex_file = oat_file.GetOatDexFile(multidex_dex_location.c_str(), nullptr);
if (oat_dex_file == nullptr) {
// There are no more multidex entries to load.
break;
}
dex_file = oat_dex_file->OpenDexFile(&error_msg);
if (dex_file.get() == nullptr) {
LOG(WARNING) << "Failed to open dex file from oat dex file: " << error_msg;
return false;
}
out_dex_files->push_back(std::move(dex_file));
}
return true;
}
bool OatFileAssistant::HasDexFiles() {
ScopedTrace trace("HasDexFiles");
// Ensure GetRequiredDexChecksums has been run so that
// has_original_dex_files_ is initialized. We don't care about the result of
// GetRequiredDexChecksums.
GetRequiredDexChecksums();
return has_original_dex_files_;
}
OatFileAssistant::OatStatus OatFileAssistant::OdexFileStatus() {
return odex_.Status();
}
OatFileAssistant::OatStatus OatFileAssistant::OatFileStatus() {
return oat_.Status();
}
bool OatFileAssistant::DexChecksumUpToDate(const VdexFile& file, std::string* error_msg) {
ScopedTrace trace("DexChecksumUpToDate(vdex)");
const std::vector<uint32_t>* required_dex_checksums = GetRequiredDexChecksums();
if (required_dex_checksums == nullptr) {
LOG(WARNING) << "Required dex checksums not found. Assuming dex checksums are up to date.";
return true;
}
uint32_t number_of_dex_files = file.GetNumberOfDexFiles();
if (required_dex_checksums->size() != number_of_dex_files) {
*error_msg = StringPrintf("expected %zu dex files but found %u",
required_dex_checksums->size(),
number_of_dex_files);
return false;
}
for (uint32_t i = 0; i < number_of_dex_files; i++) {
uint32_t expected_checksum = (*required_dex_checksums)[i];
uint32_t actual_checksum = file.GetLocationChecksum(i);
if (expected_checksum != actual_checksum) {
std::string dex = DexFileLoader::GetMultiDexLocation(i, dex_location_.c_str());
*error_msg = StringPrintf("Dex checksum does not match for dex: %s."
"Expected: %u, actual: %u",
dex.c_str(),
expected_checksum,
actual_checksum);
return false;
}
}
return true;
}
bool OatFileAssistant::DexChecksumUpToDate(const OatFile& file, std::string* error_msg) {
ScopedTrace trace("DexChecksumUpToDate(oat)");
const std::vector<uint32_t>* required_dex_checksums = GetRequiredDexChecksums();
if (required_dex_checksums == nullptr) {
LOG(WARNING) << "Required dex checksums not found. Assuming dex checksums are up to date.";
return true;
}
uint32_t number_of_dex_files = file.GetOatHeader().GetDexFileCount();
if (required_dex_checksums->size() != number_of_dex_files) {
*error_msg = StringPrintf("expected %zu dex files but found %u",
required_dex_checksums->size(),
number_of_dex_files);
return false;
}
for (uint32_t i = 0; i < number_of_dex_files; i++) {
std::string dex = DexFileLoader::GetMultiDexLocation(i, dex_location_.c_str());
uint32_t expected_checksum = (*required_dex_checksums)[i];
const OatDexFile* oat_dex_file = file.GetOatDexFile(dex.c_str(), nullptr);
if (oat_dex_file == nullptr) {
*error_msg = StringPrintf("failed to find %s in %s", dex.c_str(), file.GetLocation().c_str());
return false;
}
uint32_t actual_checksum = oat_dex_file->GetDexFileLocationChecksum();
if (expected_checksum != actual_checksum) {
VLOG(oat) << "Dex checksum does not match for dex: " << dex
<< ". Expected: " << expected_checksum
<< ", Actual: " << actual_checksum;
return false;
}
}
return true;
}
OatFileAssistant::OatStatus OatFileAssistant::GivenOatFileStatus(const OatFile& file) {
// Verify the ART_USE_READ_BARRIER state.
// TODO: Don't fully reject files due to read barrier state. If they contain
// compiled code and are otherwise okay, we should return something like
// kOatRelocationOutOfDate. If they don't contain compiled code, the read
// barrier state doesn't matter.
const bool is_cc = file.GetOatHeader().IsConcurrentCopying();
constexpr bool kRuntimeIsCC = kUseReadBarrier;
if (is_cc != kRuntimeIsCC) {
return kOatCannotOpen;
}
// Verify the dex checksum.
std::string error_msg;
VdexFile* vdex = file.GetVdexFile();
if (!DexChecksumUpToDate(*vdex, &error_msg)) {
LOG(ERROR) << error_msg;
return kOatDexOutOfDate;
}
CompilerFilter::Filter current_compiler_filter = file.GetCompilerFilter();
// Verify the image checksum
if (file.IsBackedByVdexOnly()) {
VLOG(oat) << "Image checksum test skipped for vdex file " << file.GetLocation();
} else if (CompilerFilter::DependsOnImageChecksum(current_compiler_filter)) {
if (!ValidateBootClassPathChecksums(file)) {
VLOG(oat) << "Oat image checksum does not match image checksum.";
return kOatBootImageOutOfDate;
}
if (!gc::space::ImageSpace::ValidateApexVersions(file, &error_msg)) {
VLOG(oat) << error_msg;
return kOatBootImageOutOfDate;
}
} else {
VLOG(oat) << "Image checksum test skipped for compiler filter " << current_compiler_filter;
}
// zip_file_only_contains_uncompressed_dex_ is only set during fetching the dex checksums.
DCHECK(required_dex_checksums_attempted_);
if (only_load_trusted_executable_ &&
!LocationIsTrusted(file.GetLocation(), !Runtime::Current()->DenyArtApexDataFiles()) &&
file.ContainsDexCode() &&
zip_file_only_contains_uncompressed_dex_) {
LOG(ERROR) << "Not loading "
<< dex_location_
<< ": oat file has dex code, but APK has uncompressed dex code";
return kOatDexOutOfDate;
}
if (!ClassLoaderContextIsOkay(file)) {
return kOatContextOutOfDate;
}
return kOatUpToDate;
}
bool OatFileAssistant::AnonymousDexVdexLocation(const std::vector<const DexFile::Header*>& headers,
InstructionSet isa,
/* out */ std::string* dex_location,
/* out */ std::string* vdex_filename) {
uint32_t checksum = adler32(0L, Z_NULL, 0);
for (const DexFile::Header* header : headers) {
checksum = adler32_combine(checksum,
header->checksum_,
header->file_size_ - DexFile::kNumNonChecksumBytes);
}
const std::string& data_dir = Runtime::Current()->GetProcessDataDirectory();
if (data_dir.empty() || Runtime::Current()->IsZygote()) {
*dex_location = StringPrintf("%s%u", kAnonymousDexPrefix, checksum);
return false;
}
*dex_location = StringPrintf("%s/%s%u.jar", data_dir.c_str(), kAnonymousDexPrefix, checksum);
std::string odex_filename;
std::string error_msg;
if (!DexLocationToOdexFilename(*dex_location, isa, &odex_filename, &error_msg)) {
LOG(WARNING) << "Could not get odex filename for " << *dex_location << ": " << error_msg;
return false;
}
*vdex_filename = GetVdexFilename(odex_filename);
return true;
}
bool OatFileAssistant::IsAnonymousVdexBasename(const std::string& basename) {
DCHECK(basename.find('/') == std::string::npos);
// `basename` must have format: <kAnonymousDexPrefix><checksum><kVdexExtension>
if (basename.size() < strlen(kAnonymousDexPrefix) + strlen(kVdexExtension) + 1 ||
!android::base::StartsWith(basename.c_str(), kAnonymousDexPrefix) ||
!android::base::EndsWith(basename, kVdexExtension)) {
return false;
}
// Check that all characters between the prefix and extension are decimal digits.
for (size_t i = strlen(kAnonymousDexPrefix); i < basename.size() - strlen(kVdexExtension); ++i) {
if (!std::isdigit(basename[i])) {
return false;
}
}
return true;
}
bool OatFileAssistant::DexLocationToOdexFilename(const std::string& location,
InstructionSet isa,
std::string* odex_filename,
std::string* error_msg) {
CHECK(odex_filename != nullptr);
CHECK(error_msg != nullptr);
// For a DEX file on /apex, check if there is an odex file on /system. If so, and the file exists,
// use it.
if (LocationIsOnApex(location)) {
const std::string system_file = GetSystemOdexFilenameForApex(location, isa);
if (OS::FileExists(system_file.c_str(), /*check_file_type=*/true)) {
*odex_filename = system_file;
return true;
} else if (errno != ENOENT) {
PLOG(ERROR) << "Could not check odex file " << system_file;
}
}
// The odex file name is formed by replacing the dex_location extension with
// .odex and inserting an oat/<isa> directory. For example:
// location = /foo/bar/baz.jar
// odex_location = /foo/bar/oat/<isa>/baz.odex
// Find the directory portion of the dex location and add the oat/<isa>
// directory.
size_t pos = location.rfind('/');
if (pos == std::string::npos) {
*error_msg = "Dex location " + location + " has no directory.";
return false;
}
std::string dir = location.substr(0, pos+1);
// Add the oat directory.
dir += "oat";
// Add the isa directory
dir += "/" + std::string(GetInstructionSetString(isa));
// Get the base part of the file without the extension.
std::string file = location.substr(pos+1);
pos = file.rfind('.');
if (pos == std::string::npos) {
*error_msg = "Dex location " + location + " has no extension.";
return false;
}
std::string base = file.substr(0, pos);
*odex_filename = dir + "/" + base + ".odex";
return true;
}
bool OatFileAssistant::DexLocationToOatFilename(const std::string& location,
InstructionSet isa,
std::string* oat_filename,
std::string* error_msg) {
CHECK(oat_filename != nullptr);
CHECK(error_msg != nullptr);
// Check if `location` could have an oat file in the ART APEX data directory. If so, and the
// file exists, use it.
const std::string apex_data_file = GetApexDataOdexFilename(location, isa);
if (!apex_data_file.empty() && !Runtime::Current()->DenyArtApexDataFiles()) {
if (OS::FileExists(apex_data_file.c_str(), /*check_file_type=*/true)) {
*oat_filename = apex_data_file;
return true;
} else if (errno != ENOENT) {
PLOG(ERROR) << "Could not check odex file " << apex_data_file;
}
}
// If ANDROID_DATA is not set, return false instead of aborting.
// This can occur for preopt when using a class loader context.
if (GetAndroidDataSafe(error_msg).empty()) {
*error_msg = "GetAndroidDataSafe failed: " + *error_msg;
return false;
}
std::string dalvik_cache;
bool have_android_data = false;
bool dalvik_cache_exists = false;
bool is_global_cache = false;
GetDalvikCache(GetInstructionSetString(isa),
/*create_if_absent=*/ true,
&dalvik_cache,
&have_android_data,
&dalvik_cache_exists,
&is_global_cache);
if (!dalvik_cache_exists) {
*error_msg = "Dalvik cache directory does not exist";
return false;
}
// TODO: The oat file assistant should be the definitive place for
// determining the oat file name from the dex location, not
// GetDalvikCacheFilename.
return GetDalvikCacheFilename(location.c_str(), dalvik_cache.c_str(), oat_filename, error_msg);
}
const std::vector<uint32_t>* OatFileAssistant::GetRequiredDexChecksums() {
if (!required_dex_checksums_attempted_) {
required_dex_checksums_attempted_ = true;
required_dex_checksums_found_ = false;
cached_required_dex_checksums_.clear();
std::string error_msg;
const ArtDexFileLoader dex_file_loader;
std::vector<std::string> dex_locations_ignored;
if (dex_file_loader.GetMultiDexChecksums(dex_location_.c_str(),
&cached_required_dex_checksums_,
&dex_locations_ignored,
&error_msg,
zip_fd_,
&zip_file_only_contains_uncompressed_dex_)) {
required_dex_checksums_found_ = true;
has_original_dex_files_ = true;
} else {
// The only valid case here is for APKs without dex files.
required_dex_checksums_found_ = false;
has_original_dex_files_ = false;
VLOG(oat) << "Could not get required checksum: " << error_msg;
}
}
return required_dex_checksums_found_ ? &cached_required_dex_checksums_ : nullptr;
}
bool OatFileAssistant::ValidateBootClassPathChecksums(const OatFile& oat_file) {
// Get the checksums and the BCP from the oat file.
const char* oat_boot_class_path_checksums =
oat_file.GetOatHeader().GetStoreValueByKey(OatHeader::kBootClassPathChecksumsKey);
const char* oat_boot_class_path =
oat_file.GetOatHeader().GetStoreValueByKey(OatHeader::kBootClassPathKey);
if (oat_boot_class_path_checksums == nullptr || oat_boot_class_path == nullptr) {
return false;
}
std::string_view oat_boot_class_path_checksums_view(oat_boot_class_path_checksums);
std::string_view oat_boot_class_path_view(oat_boot_class_path);
if (oat_boot_class_path_view == cached_boot_class_path_ &&
oat_boot_class_path_checksums_view == cached_boot_class_path_checksums_) {
return true;
}
Runtime* runtime = Runtime::Current();
std::string error_msg;
bool result = false;
// Fast path when the runtime boot classpath cheksums and boot classpath
// locations directly match.
if (oat_boot_class_path_checksums_view == runtime->GetBootClassPathChecksums() &&
isa_ == kRuntimeISA &&
oat_boot_class_path_view == android::base::Join(runtime->GetBootClassPathLocations(), ":")) {
result = true;
} else {
result = gc::space::ImageSpace::VerifyBootClassPathChecksums(
oat_boot_class_path_checksums_view,
oat_boot_class_path_view,
ArrayRef<const std::string>(runtime->GetImageLocations()),
ArrayRef<const std::string>(runtime->GetBootClassPathLocations()),
ArrayRef<const std::string>(runtime->GetBootClassPath()),
ArrayRef<const int>(runtime->GetBootClassPathFds()),
isa_,
&error_msg);
}
if (!result) {
VLOG(oat) << "Failed to verify checksums of oat file " << oat_file.GetLocation()
<< " error: " << error_msg;
return false;
}
// This checksum has been validated, so save it.
cached_boot_class_path_ = oat_boot_class_path_view;
cached_boot_class_path_checksums_ = oat_boot_class_path_checksums_view;
return true;
}
OatFileAssistant::OatFileInfo& OatFileAssistant::GetBestInfo() {
ScopedTrace trace("GetBestInfo");
// TODO(calin): Document the side effects of class loading when
// running dalvikvm command line.
if (dex_parent_writable_ || UseFdToReadFiles()) {
// If the parent of the dex file is writable it means that we can
// create the odex file. In this case we unconditionally pick the odex
// as the best oat file. This corresponds to the regular use case when
// apps gets installed or when they load private, secondary dex file.
// For apps on the system partition the odex location will not be
// writable and thus the oat location might be more up to date.
// If the odex is not useable, and we have a useable vdex, return the vdex
// instead.
if (!odex_.IsUseable()) {
if (vdex_for_odex_.IsUseable()) {
return vdex_for_odex_;
} else if (dm_for_odex_.IsUseable()) {
return dm_for_odex_;
}
}
return odex_;
}
// We cannot write to the odex location. This must be a system app.
// If the oat location is useable take it.
if (oat_.IsUseable()) {
return oat_;
}
// The oat file is not useable but the odex file might be up to date.
// This is an indication that we are dealing with an up to date prebuilt
// (that doesn't need relocation).
if (odex_.IsUseable()) {
return odex_;
}
// Look for a useable vdex file.
if (vdex_for_oat_.IsUseable()) {
return vdex_for_oat_;
}
if (vdex_for_odex_.IsUseable()) {
return vdex_for_odex_;
}
if (dm_for_oat_.IsUseable()) {
return dm_for_oat_;
}
if (dm_for_odex_.IsUseable()) {
return dm_for_odex_;
}
// We got into the worst situation here:
// - the oat location is not useable
// - the prebuild odex location is not up to date
// - the vdex-only file is not useable
// - and we don't have the original dex file anymore (stripped).
// Pick the odex if it exists, or the oat if not.
return (odex_.Status() == kOatCannotOpen) ? oat_ : odex_;
}
std::unique_ptr<gc::space::ImageSpace> OatFileAssistant::OpenImageSpace(const OatFile* oat_file) {
DCHECK(oat_file != nullptr);
std::string art_file = ReplaceFileExtension(oat_file->GetLocation(), "art");
if (art_file.empty()) {
return nullptr;
}
std::string error_msg;
ScopedObjectAccess soa(Thread::Current());
std::unique_ptr<gc::space::ImageSpace> ret =
gc::space::ImageSpace::CreateFromAppImage(art_file.c_str(), oat_file, &error_msg);
if (ret == nullptr && (VLOG_IS_ON(image) || OS::FileExists(art_file.c_str()))) {
LOG(INFO) << "Failed to open app image " << art_file.c_str() << " " << error_msg;
}
return ret;
}
OatFileAssistant::OatFileInfo::OatFileInfo(OatFileAssistant* oat_file_assistant,
bool is_oat_location)
: oat_file_assistant_(oat_file_assistant), is_oat_location_(is_oat_location)
{}
bool OatFileAssistant::OatFileInfo::IsOatLocation() {
return is_oat_location_;
}
const std::string* OatFileAssistant::OatFileInfo::Filename() {
return filename_provided_ ? &filename_ : nullptr;
}
bool OatFileAssistant::OatFileInfo::IsUseable() {
ScopedTrace trace("IsUseable");
switch (Status()) {
case kOatCannotOpen:
case kOatDexOutOfDate:
case kOatContextOutOfDate:
case kOatBootImageOutOfDate: return false;
case kOatUpToDate: return true;
}
UNREACHABLE();
}
OatFileAssistant::OatStatus OatFileAssistant::OatFileInfo::Status() {
ScopedTrace trace("Status");
if (!status_attempted_) {
status_attempted_ = true;
const OatFile* file = GetFile();
if (file == nullptr) {
status_ = kOatCannotOpen;
} else {
status_ = oat_file_assistant_->GivenOatFileStatus(*file);
VLOG(oat) << file->GetLocation() << " is " << status_
<< " with filter " << file->GetCompilerFilter();
}
}
return status_;
}
OatFileAssistant::DexOptNeeded OatFileAssistant::OatFileInfo::GetDexOptNeeded(
CompilerFilter::Filter target,
bool profile_changed,
bool downgrade) {
if (IsUseable()) {
return CompilerFilterIsOkay(target, profile_changed, downgrade)
? kNoDexOptNeeded
: kDex2OatForFilter;
}
if (Status() == kOatBootImageOutOfDate) {
return kDex2OatForBootImage;
}
if (oat_file_assistant_->HasDexFiles()) {
return kDex2OatFromScratch;
} else {
// No dex file, there is nothing we need to do.
return kNoDexOptNeeded;
}
}
const OatFile* OatFileAssistant::OatFileInfo::GetFile() {
CHECK(!file_released_) << "GetFile called after oat file released.";
if (load_attempted_) {
return file_.get();
}
load_attempted_ = true;
if (!filename_provided_) {
return nullptr;
}
if (LocationIsOnArtApexData(filename_) && Runtime::Current()->DenyArtApexDataFiles()) {
LOG(WARNING) << "OatFileAssistant rejected file " << filename_
<< ": ART apexdata is untrusted.";
return nullptr;
}
std::string error_msg;
bool executable = oat_file_assistant_->load_executable_;
if (android::base::EndsWith(filename_, kVdexExtension)) {
executable = false;
// Check to see if there is a vdex file we can make use of.
std::unique_ptr<VdexFile> vdex;
if (use_fd_) {
if (vdex_fd_ >= 0) {
struct stat s;
int rc = TEMP_FAILURE_RETRY(fstat(vdex_fd_, &s));
if (rc == -1) {
error_msg = StringPrintf("Failed getting length of the vdex file %s.", strerror(errno));
} else {
vdex = VdexFile::Open(vdex_fd_,
s.st_size,
filename_,
/*writable=*/ false,
/*low_4gb=*/ false,
&error_msg);
}
}
} else {
vdex = VdexFile::Open(filename_,
/*writable=*/ false,
/*low_4gb=*/ false,
&error_msg);
}
if (vdex == nullptr) {
VLOG(oat) << "unable to open vdex file " << filename_ << ": " << error_msg;
} else {
file_.reset(OatFile::OpenFromVdex(zip_fd_,
std::move(vdex),
oat_file_assistant_->dex_location_,
&error_msg));
}
} else if (android::base::EndsWith(filename_, kDmExtension)) {
executable = false;
// Check to see if there is a vdex file we can make use of.
std::unique_ptr<ZipArchive> dm_file(ZipArchive::Open(filename_.c_str(), &error_msg));
if (dm_file != nullptr) {
std::unique_ptr<VdexFile> vdex(VdexFile::OpenFromDm(filename_, *dm_file));
if (vdex != nullptr) {
file_.reset(OatFile::OpenFromVdex(zip_fd_,
std::move(vdex),
oat_file_assistant_->dex_location_,
&error_msg));
}
}
} else {
if (executable && oat_file_assistant_->only_load_trusted_executable_) {
executable = LocationIsTrusted(filename_, /*trust_art_apex_data_files=*/ true);
}
VLOG(oat) << "Loading " << filename_ << " with executable: " << executable;
if (use_fd_) {
if (oat_fd_ >= 0 && vdex_fd_ >= 0) {
ArrayRef<const std::string> dex_locations(&oat_file_assistant_->dex_location_,
/*size=*/ 1u);
file_.reset(OatFile::Open(zip_fd_,
vdex_fd_,
oat_fd_,
filename_.c_str(),
executable,
/*low_4gb=*/ false,
dex_locations,
/*dex_fds=*/ ArrayRef<const int>(),
/*reservation=*/ nullptr,
&error_msg));
}
} else {
file_.reset(OatFile::Open(/*zip_fd=*/ -1,
filename_.c_str(),
filename_.c_str(),
executable,
/*low_4gb=*/ false,
oat_file_assistant_->dex_location_,
&error_msg));
}
}
if (file_.get() == nullptr) {
VLOG(oat) << "OatFileAssistant test for existing oat file "
<< filename_
<< ": " << error_msg;
} else {
VLOG(oat) << "Successfully loaded " << filename_ << " with executable: " << executable;
}
return file_.get();
}
bool OatFileAssistant::OatFileInfo::CompilerFilterIsOkay(
CompilerFilter::Filter target, bool profile_changed, bool downgrade) {
const OatFile* file = GetFile();
if (file == nullptr) {
return false;
}
CompilerFilter::Filter current = file->GetCompilerFilter();
if (profile_changed && CompilerFilter::DependsOnProfile(current)) {
VLOG(oat) << "Compiler filter not okay because Profile changed";
return false;
}
if (downgrade) {
return !CompilerFilter::IsBetter(current, target);
}
if (CompilerFilter::DependsOnImageChecksum(current) &&
CompilerFilter::IsAsGoodAs(current, target)) {
// If the oat file has been compiled without an image, and the runtime is
// now running with an image loaded from disk, return that we need to
// re-compile. The recompilation will generate a better oat file, and with an app
// image for profile guided compilation.
const char* oat_boot_class_path_checksums =
file->GetOatHeader().GetStoreValueByKey(OatHeader::kBootClassPathChecksumsKey);
if (oat_boot_class_path_checksums != nullptr &&
!StartsWith(oat_boot_class_path_checksums, "i") &&
!Runtime::Current()->HasImageWithProfile()) {
DCHECK(!file->GetOatHeader().RequiresImage());
return false;
}
}
return CompilerFilter::IsAsGoodAs(current, target);
}
bool OatFileAssistant::ClassLoaderContextIsOkay(const OatFile& oat_file) const {
if (oat_file.IsBackedByVdexOnly()) {
// Only a vdex file, we don't depend on the class loader context.
return true;
}
if (!CompilerFilter::IsVerificationEnabled(oat_file.GetCompilerFilter())) {
// If verification is not enabled we don't need to verify the class loader context and we
// assume it's ok.
return true;
}
if (context_ == nullptr) {
// When no class loader context is provided (which happens for deprecated
// DexFile APIs), just assume it is OK.
return true;
}
ClassLoaderContext::VerificationResult matches = context_->VerifyClassLoaderContextMatch(
oat_file.GetClassLoaderContext(),
/*verify_names=*/ true,
/*verify_checksums=*/ true);
if (matches == ClassLoaderContext::VerificationResult::kMismatch) {
VLOG(oat) << "ClassLoaderContext check failed. Context was "
<< oat_file.GetClassLoaderContext()
<< ". The expected context is "
<< context_->EncodeContextForOatFile(android::base::Dirname(dex_location_));
return false;
}
return true;
}
bool OatFileAssistant::OatFileInfo::IsExecutable() {
const OatFile* file = GetFile();
return (file != nullptr && file->IsExecutable());
}
void OatFileAssistant::OatFileInfo::Reset() {
load_attempted_ = false;
file_.reset();
status_attempted_ = false;
}
void OatFileAssistant::OatFileInfo::Reset(const std::string& filename,
bool use_fd,
int zip_fd,
int vdex_fd,
int oat_fd) {
filename_provided_ = true;
filename_ = filename;
use_fd_ = use_fd;
zip_fd_ = zip_fd;
vdex_fd_ = vdex_fd;
oat_fd_ = oat_fd;
Reset();
}
std::unique_ptr<OatFile> OatFileAssistant::OatFileInfo::ReleaseFile() {
file_released_ = true;
return std::move(file_);
}
std::unique_ptr<OatFile> OatFileAssistant::OatFileInfo::ReleaseFileForUse() {
ScopedTrace trace("ReleaseFileForUse");
if (Status() == kOatUpToDate) {
return ReleaseFile();
}
return std::unique_ptr<OatFile>();
}
// TODO(calin): we could provide a more refined status here
// (e.g. run from uncompressed apk, run with vdex but not oat etc). It will allow us to
// track more experiments but adds extra complexity.
void OatFileAssistant::GetOptimizationStatus(
const std::string& filename,
InstructionSet isa,
std::string* out_compilation_filter,
std::string* out_compilation_reason) {
// It may not be possible to load an oat file executable (e.g., selinux restrictions). Load
// non-executable and check the status manually.
OatFileAssistant oat_file_assistant(filename.c_str(),
isa,
/* context= */ nullptr,
/*load_executable=*/ false);
std::string out_odex_location; // unused
std::string out_odex_status; // unused
oat_file_assistant.GetOptimizationStatus(
&out_odex_location,
out_compilation_filter,
out_compilation_reason,
&out_odex_status);
}
void OatFileAssistant::GetOptimizationStatus(
std::string* out_odex_location,
std::string* out_compilation_filter,
std::string* out_compilation_reason,
std::string* out_odex_status) {
OatFileInfo& oat_file_info = GetBestInfo();
const OatFile* oat_file = GetBestInfo().GetFile();
if (oat_file == nullptr) {
*out_odex_location = "error";
*out_compilation_filter = "run-from-apk";
*out_compilation_reason = "unknown";
// This mostly happens when we cannot open the oat file.
// Note that it's different than kOatCannotOpen.
// TODO: The design of getting the BestInfo is not ideal,
// as it's not very clear what's the difference between
// a nullptr and kOatcannotOpen. The logic should be revised
// and improved.
*out_odex_status = "io-error-no-oat";
return;
}
*out_odex_location = oat_file->GetLocation();
OatStatus status = oat_file_info.Status();
const char* reason = oat_file->GetCompilationReason();
*out_compilation_reason = reason == nullptr ? "unknown" : reason;
switch (status) {
case kOatUpToDate:
*out_compilation_filter = CompilerFilter::NameOfFilter(oat_file->GetCompilerFilter());
*out_odex_status = "up-to-date";
return;
case kOatCannotOpen: // This should never happen, but be robust.
*out_compilation_filter = "error";
*out_compilation_reason = "error";
// This mostly happens when we cannot open the vdex file,
// or the file is corrupt.
*out_odex_status = "io-error-or-corruption";
return;
case kOatBootImageOutOfDate:
*out_compilation_filter = "run-from-apk-fallback";
*out_odex_status = "boot-image-more-recent";
return;
case kOatContextOutOfDate:
*out_compilation_filter = "run-from-apk-fallback";
*out_odex_status = "context-mismatch";
return;
case kOatDexOutOfDate:
*out_compilation_filter = "run-from-apk-fallback";
*out_odex_status = "apk-more-recent";
return;
}
LOG(FATAL) << "Unreachable";
UNREACHABLE();
}
} // namespace art