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LeafOS / LeafOS-Project / android_art / d0834e4a44440a8faf199024a030731ad26aae68 / . / runtime / oat_file.cc
blob: af87637d570fda184d8e6a57d63568027d1acd6d [file] [log] [blame]
/*
* Copyright (C) 2011 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.h"
#include <dlfcn.h>
#ifndef __APPLE__
#include <link.h> // for dl_iterate_phdr.
#endif
#include <unistd.h>
#include <cstdlib>
#include <cstring>
#include <sstream>
#include <type_traits>
#include <sys/stat.h>
// dlopen_ext support from bionic.
#ifdef ART_TARGET_ANDROID
#include "android/dlext.h"
#endif
#include "android-base/stringprintf.h"
#include "art_method.h"
#include "base/bit_vector.h"
#include "base/enums.h"
#include "base/file_utils.h"
#include "base/logging.h" // For VLOG_IS_ON.
#include "base/mem_map.h"
#include "base/os.h"
#include "base/stl_util.h"
#include "base/systrace.h"
#include "base/unix_file/fd_file.h"
#include "base/utils.h"
#include "dex/art_dex_file_loader.h"
#include "dex/dex_file_loader.h"
#include "dex/dex_file_types.h"
#include "dex/standard_dex_file.h"
#include "dex/type_lookup_table.h"
#include "dex/utf-inl.h"
#include "elf_file.h"
#include "elf_utils.h"
#include "gc_root.h"
#include "gc/space/image_space.h"
#include "mirror/class.h"
#include "mirror/object-inl.h"
#include "oat.h"
#include "oat_file-inl.h"
#include "oat_file_manager.h"
#include "runtime.h"
#include "vdex_file.h"
namespace art {
using android::base::StringPrintf;
// Whether OatFile::Open will try dlopen. Fallback is our own ELF loader.
static constexpr bool kUseDlopen = true;
// Whether OatFile::Open will try dlopen on the host. On the host we're not linking against
// bionic, so cannot take advantage of the support for changed semantics (loading the same soname
// multiple times). However, if/when we switch the above, we likely want to switch this, too,
// to get test coverage of the code paths.
static constexpr bool kUseDlopenOnHost = true;
// For debugging, Open will print DlOpen error message if set to true.
static constexpr bool kPrintDlOpenErrorMessage = false;
// Note for OatFileBase and descendents:
//
// These are used in OatFile::Open to try all our loaders.
//
// The process is simple:
//
// 1) Allocate an instance through the standard constructor (location, executable)
// 2) Load() to try to open the file.
// 3) ComputeFields() to populate the OatFile fields like begin_, using FindDynamicSymbolAddress.
// 4) PreSetup() for any steps that should be done before the final setup.
// 5) Setup() to complete the procedure.
class OatFileBase : public OatFile {
public:
virtual ~OatFileBase() {}
template <typename kOatFileBaseSubType>
static OatFileBase* OpenOatFile(int zip_fd,
const std::string& vdex_filename,
const std::string& elf_filename,
const std::string& location,
bool writable,
bool executable,
bool low_4gb,
const char* abs_dex_location,
/*inout*/MemMap* reservation, // Where to load if not null.
/*out*/std::string* error_msg);
template <typename kOatFileBaseSubType>
static OatFileBase* OpenOatFile(int zip_fd,
int vdex_fd,
int oat_fd,
const std::string& vdex_filename,
const std::string& oat_filename,
bool writable,
bool executable,
bool low_4gb,
const char* abs_dex_location,
/*inout*/MemMap* reservation, // Where to load if not null.
/*out*/std::string* error_msg);
protected:
OatFileBase(const std::string& filename, bool executable) : OatFile(filename, executable) {}
virtual const uint8_t* FindDynamicSymbolAddress(const std::string& symbol_name,
std::string* error_msg) const = 0;
virtual void PreLoad() = 0;
bool LoadVdex(const std::string& vdex_filename,
bool writable,
bool low_4gb,
std::string* error_msg);
bool LoadVdex(int vdex_fd,
const std::string& vdex_filename,
bool writable,
bool low_4gb,
std::string* error_msg);
virtual bool Load(const std::string& elf_filename,
bool writable,
bool executable,
bool low_4gb,
/*inout*/MemMap* reservation, // Where to load if not null.
/*out*/std::string* error_msg) = 0;
virtual bool Load(int oat_fd,
bool writable,
bool executable,
bool low_4gb,
/*inout*/MemMap* reservation, // Where to load if not null.
/*out*/std::string* error_msg) = 0;
bool ComputeFields(const std::string& file_path, std::string* error_msg);
virtual void PreSetup(const std::string& elf_filename) = 0;
bool Setup(int zip_fd, const char* abs_dex_location, std::string* error_msg);
// Setters exposed for ElfOatFile.
void SetBegin(const uint8_t* begin) {
begin_ = begin;
}
void SetEnd(const uint8_t* end) {
end_ = end;
}
void SetVdex(VdexFile* vdex) {
vdex_.reset(vdex);
}
private:
DISALLOW_COPY_AND_ASSIGN(OatFileBase);
};
template <typename kOatFileBaseSubType>
OatFileBase* OatFileBase::OpenOatFile(int zip_fd,
const std::string& vdex_filename,
const std::string& elf_filename,
const std::string& location,
bool writable,
bool executable,
bool low_4gb,
const char* abs_dex_location,
/*inout*/MemMap* reservation,
/*out*/std::string* error_msg) {
std::unique_ptr<OatFileBase> ret(new kOatFileBaseSubType(location, executable));
ret->PreLoad();
if (!ret->Load(elf_filename,
writable,
executable,
low_4gb,
reservation,
error_msg)) {
return nullptr;
}
if (!ret->ComputeFields(elf_filename, error_msg)) {
return nullptr;
}
ret->PreSetup(elf_filename);
if (!ret->LoadVdex(vdex_filename, writable, low_4gb, error_msg)) {
return nullptr;
}
if (!ret->Setup(zip_fd, abs_dex_location, error_msg)) {
return nullptr;
}
return ret.release();
}
template <typename kOatFileBaseSubType>
OatFileBase* OatFileBase::OpenOatFile(int zip_fd,
int vdex_fd,
int oat_fd,
const std::string& vdex_location,
const std::string& oat_location,
bool writable,
bool executable,
bool low_4gb,
const char* abs_dex_location,
/*inout*/MemMap* reservation,
/*out*/std::string* error_msg) {
std::unique_ptr<OatFileBase> ret(new kOatFileBaseSubType(oat_location, executable));
if (!ret->Load(oat_fd,
writable,
executable,
low_4gb,
reservation,
error_msg)) {
return nullptr;
}
if (!ret->ComputeFields(oat_location, error_msg)) {
return nullptr;
}
ret->PreSetup(oat_location);
if (!ret->LoadVdex(vdex_fd, vdex_location, writable, low_4gb, error_msg)) {
return nullptr;
}
if (!ret->Setup(zip_fd, abs_dex_location, error_msg)) {
return nullptr;
}
return ret.release();
}
bool OatFileBase::LoadVdex(const std::string& vdex_filename,
bool writable,
bool low_4gb,
std::string* error_msg) {
vdex_ = VdexFile::OpenAtAddress(vdex_begin_,
vdex_end_ - vdex_begin_,
/*mmap_reuse=*/ vdex_begin_ != nullptr,
vdex_filename,
writable,
low_4gb,
/* unquicken=*/ false,
error_msg);
if (vdex_.get() == nullptr) {
*error_msg = StringPrintf("Failed to load vdex file '%s' %s",
vdex_filename.c_str(),
error_msg->c_str());
return false;
}
return true;
}
bool OatFileBase::LoadVdex(int vdex_fd,
const std::string& vdex_filename,
bool writable,
bool low_4gb,
std::string* error_msg) {
if (vdex_fd != -1) {
struct stat s;
int rc = TEMP_FAILURE_RETRY(fstat(vdex_fd, &s));
if (rc == -1) {
PLOG(WARNING) << "Failed getting length of vdex file";
} else {
vdex_ = VdexFile::OpenAtAddress(vdex_begin_,
vdex_end_ - vdex_begin_,
/*mmap_reuse=*/ vdex_begin_ != nullptr,
vdex_fd,
s.st_size,
vdex_filename,
writable,
low_4gb,
/*unquicken=*/ false,
error_msg);
if (vdex_.get() == nullptr) {
*error_msg = "Failed opening vdex file.";
return false;
}
}
}
return true;
}
bool OatFileBase::ComputeFields(const std::string& file_path, std::string* error_msg) {
std::string symbol_error_msg;
begin_ = FindDynamicSymbolAddress("oatdata", &symbol_error_msg);
if (begin_ == nullptr) {
*error_msg = StringPrintf("Failed to find oatdata symbol in '%s' %s",
file_path.c_str(),
symbol_error_msg.c_str());
return false;
}
end_ = FindDynamicSymbolAddress("oatlastword", &symbol_error_msg);
if (end_ == nullptr) {
*error_msg = StringPrintf("Failed to find oatlastword symbol in '%s' %s",
file_path.c_str(),
symbol_error_msg.c_str());
return false;
}
// Readjust to be non-inclusive upper bound.
end_ += sizeof(uint32_t);
data_bimg_rel_ro_begin_ = FindDynamicSymbolAddress("oatdatabimgrelro", &symbol_error_msg);
if (data_bimg_rel_ro_begin_ != nullptr) {
data_bimg_rel_ro_end_ =
FindDynamicSymbolAddress("oatdatabimgrelrolastword", &symbol_error_msg);
if (data_bimg_rel_ro_end_ == nullptr) {
*error_msg =
StringPrintf("Failed to find oatdatabimgrelrolastword symbol in '%s'", file_path.c_str());
return false;
}
// Readjust to be non-inclusive upper bound.
data_bimg_rel_ro_end_ += sizeof(uint32_t);
}
bss_begin_ = const_cast<uint8_t*>(FindDynamicSymbolAddress("oatbss", &symbol_error_msg));
if (bss_begin_ == nullptr) {
// No .bss section.
bss_end_ = nullptr;
} else {
bss_end_ = const_cast<uint8_t*>(FindDynamicSymbolAddress("oatbsslastword", &symbol_error_msg));
if (bss_end_ == nullptr) {
*error_msg = StringPrintf("Failed to find oatbsslastword symbol in '%s'", file_path.c_str());
return false;
}
// Readjust to be non-inclusive upper bound.
bss_end_ += sizeof(uint32_t);
// Find bss methods if present.
bss_methods_ =
const_cast<uint8_t*>(FindDynamicSymbolAddress("oatbssmethods", &symbol_error_msg));
// Find bss roots if present.
bss_roots_ = const_cast<uint8_t*>(FindDynamicSymbolAddress("oatbssroots", &symbol_error_msg));
}
vdex_begin_ = const_cast<uint8_t*>(FindDynamicSymbolAddress("oatdex", &symbol_error_msg));
if (vdex_begin_ == nullptr) {
// No .vdex section.
vdex_end_ = nullptr;
} else {
vdex_end_ = const_cast<uint8_t*>(FindDynamicSymbolAddress("oatdexlastword", &symbol_error_msg));
if (vdex_end_ == nullptr) {
*error_msg = StringPrintf("Failed to find oatdexlastword symbol in '%s'", file_path.c_str());
return false;
}
// Readjust to be non-inclusive upper bound.
vdex_end_ += sizeof(uint32_t);
}
return true;
}
// Read an unaligned entry from the OatDexFile data in OatFile and advance the read
// position by the number of bytes read, i.e. sizeof(T).
// Return true on success, false if the read would go beyond the end of the OatFile.
template <typename T>
inline static bool ReadOatDexFileData(const OatFile& oat_file,
/*inout*/const uint8_t** oat,
/*out*/T* value) {
DCHECK(oat != nullptr);
DCHECK(value != nullptr);
DCHECK_LE(*oat, oat_file.End());
if (UNLIKELY(static_cast<size_t>(oat_file.End() - *oat) < sizeof(T))) {
return false;
}
static_assert(std::is_trivial<T>::value, "T must be a trivial type");
using unaligned_type __attribute__((__aligned__(1))) = T;
*value = *reinterpret_cast<const unaligned_type*>(*oat);
*oat += sizeof(T);
return true;
}
static bool ReadIndexBssMapping(OatFile* oat_file,
/*inout*/const uint8_t** oat,
size_t dex_file_index,
const std::string& dex_file_location,
const char* tag,
/*out*/const IndexBssMapping** mapping,
std::string* error_msg) {
uint32_t index_bss_mapping_offset;
if (UNLIKELY(!ReadOatDexFileData(*oat_file, oat, &index_bss_mapping_offset))) {
*error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zd for '%s' truncated "
"after %s bss mapping offset",
oat_file->GetLocation().c_str(),
dex_file_index,
dex_file_location.c_str(),
tag);
return false;
}
const bool readable_index_bss_mapping_size =
index_bss_mapping_offset != 0u &&
index_bss_mapping_offset <= oat_file->Size() &&
IsAligned<alignof(IndexBssMapping)>(index_bss_mapping_offset) &&
oat_file->Size() - index_bss_mapping_offset >= IndexBssMapping::ComputeSize(0);
const IndexBssMapping* index_bss_mapping = readable_index_bss_mapping_size
? reinterpret_cast<const IndexBssMapping*>(oat_file->Begin() + index_bss_mapping_offset)
: nullptr;
if (index_bss_mapping_offset != 0u &&
(UNLIKELY(index_bss_mapping == nullptr) ||
UNLIKELY(index_bss_mapping->size() == 0u) ||
UNLIKELY(oat_file->Size() - index_bss_mapping_offset <
IndexBssMapping::ComputeSize(index_bss_mapping->size())))) {
*error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zu for '%s' with unaligned or "
" truncated %s bss mapping, offset %u of %zu, length %zu",
oat_file->GetLocation().c_str(),
dex_file_index,
dex_file_location.c_str(),
tag,
index_bss_mapping_offset,
oat_file->Size(),
index_bss_mapping != nullptr ? index_bss_mapping->size() : 0u);
return false;
}
*mapping = index_bss_mapping;
return true;
}
static void DCheckIndexToBssMapping(OatFile* oat_file,
uint32_t number_of_indexes,
size_t slot_size,
const IndexBssMapping* index_bss_mapping) {
if (kIsDebugBuild && index_bss_mapping != nullptr) {
size_t index_bits = IndexBssMappingEntry::IndexBits(number_of_indexes);
const IndexBssMappingEntry* prev_entry = nullptr;
for (const IndexBssMappingEntry& entry : *index_bss_mapping) {
CHECK_ALIGNED_PARAM(entry.bss_offset, slot_size);
// When loading a non-executable ElfOatFile, .bss symbols are not even
// looked up, so we cannot verify the offset against BssSize().
if (oat_file->IsExecutable()) {
CHECK_LT(entry.bss_offset, oat_file->BssSize());
}
uint32_t mask = entry.GetMask(index_bits);
CHECK_LE(POPCOUNT(mask) * slot_size, entry.bss_offset);
size_t index_mask_span = (mask != 0u) ? 32u - index_bits - CTZ(mask) : 0u;
CHECK_LE(index_mask_span, entry.GetIndex(index_bits));
if (prev_entry != nullptr) {
CHECK_LT(prev_entry->GetIndex(index_bits), entry.GetIndex(index_bits) - index_mask_span);
}
prev_entry = &entry;
}
CHECK_LT(prev_entry->GetIndex(index_bits), number_of_indexes);
}
}
bool OatFileBase::Setup(int zip_fd, const char* abs_dex_location, std::string* error_msg) {
if (!GetOatHeader().IsValid()) {
std::string cause = GetOatHeader().GetValidationErrorMessage();
*error_msg = StringPrintf("Invalid oat header for '%s': %s",
GetLocation().c_str(),
cause.c_str());
return false;
}
PointerSize pointer_size = GetInstructionSetPointerSize(GetOatHeader().GetInstructionSet());
size_t key_value_store_size =
(Size() >= sizeof(OatHeader)) ? GetOatHeader().GetKeyValueStoreSize() : 0u;
if (Size() < sizeof(OatHeader) + key_value_store_size) {
*error_msg = StringPrintf("In oat file '%s' found truncated OatHeader, "
"size = %zu < %zu + %zu",
GetLocation().c_str(),
Size(),
sizeof(OatHeader),
key_value_store_size);
return false;
}
size_t oat_dex_files_offset = GetOatHeader().GetOatDexFilesOffset();
if (oat_dex_files_offset < GetOatHeader().GetHeaderSize() || oat_dex_files_offset > Size()) {
*error_msg = StringPrintf("In oat file '%s' found invalid oat dex files offset: "
"%zu is not in [%zu, %zu]",
GetLocation().c_str(),
oat_dex_files_offset,
GetOatHeader().GetHeaderSize(),
Size());
return false;
}
const uint8_t* oat = Begin() + oat_dex_files_offset; // Jump to the OatDexFile records.
if (!IsAligned<sizeof(uint32_t)>(data_bimg_rel_ro_begin_) ||
!IsAligned<sizeof(uint32_t)>(data_bimg_rel_ro_end_) ||
data_bimg_rel_ro_begin_ > data_bimg_rel_ro_end_) {
*error_msg = StringPrintf("In oat file '%s' found unaligned or unordered databimgrelro "
"symbol(s): begin = %p, end = %p",
GetLocation().c_str(),
data_bimg_rel_ro_begin_,
data_bimg_rel_ro_end_);
return false;
}
DCHECK_GE(static_cast<size_t>(pointer_size), alignof(GcRoot<mirror::Object>));
if (!IsAligned<kPageSize>(bss_begin_) ||
!IsAlignedParam(bss_methods_, static_cast<size_t>(pointer_size)) ||
!IsAlignedParam(bss_roots_, static_cast<size_t>(pointer_size)) ||
!IsAligned<alignof(GcRoot<mirror::Object>)>(bss_end_)) {
*error_msg = StringPrintf("In oat file '%s' found unaligned bss symbol(s): "
"begin = %p, methods_ = %p, roots = %p, end = %p",
GetLocation().c_str(),
bss_begin_,
bss_methods_,
bss_roots_,
bss_end_);
return false;
}
if ((bss_methods_ != nullptr && (bss_methods_ < bss_begin_ || bss_methods_ > bss_end_)) ||
(bss_roots_ != nullptr && (bss_roots_ < bss_begin_ || bss_roots_ > bss_end_)) ||
(bss_methods_ != nullptr && bss_roots_ != nullptr && bss_methods_ > bss_roots_)) {
*error_msg = StringPrintf("In oat file '%s' found bss symbol(s) outside .bss or unordered: "
"begin = %p, methods = %p, roots = %p, end = %p",
GetLocation().c_str(),
bss_begin_,
bss_methods_,
bss_roots_,
bss_end_);
return false;
}
if (bss_methods_ != nullptr && bss_methods_ != bss_begin_) {
*error_msg = StringPrintf("In oat file '%s' found unexpected .bss gap before 'oatbssmethods': "
"begin = %p, methods = %p",
GetLocation().c_str(),
bss_begin_,
bss_methods_);
return false;
}
uint32_t dex_file_count = GetOatHeader().GetDexFileCount();
oat_dex_files_storage_.reserve(dex_file_count);
for (size_t i = 0; i < dex_file_count; i++) {
uint32_t dex_file_location_size;
if (UNLIKELY(!ReadOatDexFileData(*this, &oat, &dex_file_location_size))) {
*error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zu truncated after dex file "
"location size",
GetLocation().c_str(),
i);
return false;
}
if (UNLIKELY(dex_file_location_size == 0U)) {
*error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zu with empty location name",
GetLocation().c_str(),
i);
return false;
}
if (UNLIKELY(static_cast<size_t>(End() - oat) < dex_file_location_size)) {
*error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zu with truncated dex file "
"location",
GetLocation().c_str(),
i);
return false;
}
const char* dex_file_location_data = reinterpret_cast<const char*>(oat);
oat += dex_file_location_size;
std::string dex_file_location = ResolveRelativeEncodedDexLocation(
abs_dex_location,
std::string(dex_file_location_data, dex_file_location_size));
uint32_t dex_file_checksum;
if (UNLIKELY(!ReadOatDexFileData(*this, &oat, &dex_file_checksum))) {
*error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zu for '%s' truncated after "
"dex file checksum",
GetLocation().c_str(),
i,
dex_file_location.c_str());
return false;
}
uint32_t dex_file_offset;
if (UNLIKELY(!ReadOatDexFileData(*this, &oat, &dex_file_offset))) {
*error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zu for '%s' truncated "
"after dex file offsets",
GetLocation().c_str(),
i,
dex_file_location.c_str());
return false;
}
if (UNLIKELY(dex_file_offset > DexSize())) {
*error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zu for '%s' with dex file "
"offset %u > %zu",
GetLocation().c_str(),
i,
dex_file_location.c_str(),
dex_file_offset,
DexSize());
return false;
}
const uint8_t* dex_file_pointer = nullptr;
if (UNLIKELY(dex_file_offset == 0U)) {
if (uncompressed_dex_files_ == nullptr) {
// Do not support mixed-mode oat files.
if (i > 0) {
*error_msg = StringPrintf("In oat file '%s', unsupported uncompressed-dex-file for dex "
"file %zu (%s)",
GetLocation().c_str(),
i,
dex_file_location.c_str());
return false;
}
uncompressed_dex_files_.reset(new std::vector<std::unique_ptr<const DexFile>>());
// No dex files, load it from location.
const ArtDexFileLoader dex_file_loader;
bool loaded = false;
if (zip_fd != -1) {
loaded = dex_file_loader.OpenZip(zip_fd,
dex_file_location,
/*verify=*/ false,
/*verify_checksum=*/ false,
error_msg,
uncompressed_dex_files_.get());
} else {
loaded = dex_file_loader.Open(dex_file_location.c_str(),
dex_file_location,
/*verify=*/ false,
/*verify_checksum=*/ false,
error_msg,
uncompressed_dex_files_.get());
}
if (!loaded) {
if (Runtime::Current() == nullptr) {
// If there's no runtime, we're running oatdump, so return
// a half constructed oat file that oatdump knows how to deal with.
LOG(WARNING) << "Could not find associated dex files of oat file. "
<< "Oatdump will only dump the header.";
return true;
} else {
return false;
}
}
// The oat file may be out of date wrt/ the dex-file location. We need to be defensive
// here and ensure that at least the number of dex files still matches.
// Note: actual checksum comparisons are the duty of the OatFileAssistant and will be
// done after loading the OatFile.
if (uncompressed_dex_files_->size() != dex_file_count) {
*error_msg = StringPrintf("In oat file '%s', expected %u uncompressed dex files, but "
"found %zu in '%s'",
GetLocation().c_str(),
dex_file_count,
uncompressed_dex_files_->size(),
dex_file_location.c_str());
return false;
}
}
dex_file_pointer = (*uncompressed_dex_files_)[i]->Begin();
} else {
// Do not support mixed-mode oat files.
if (uncompressed_dex_files_ != nullptr) {
*error_msg = StringPrintf("In oat file '%s', unsupported embedded dex-file for dex file "
"%zu (%s)",
GetLocation().c_str(),
i,
dex_file_location.c_str());
return false;
}
if (UNLIKELY(DexSize() - dex_file_offset < sizeof(DexFile::Header))) {
*error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zu for '%s' with dex file "
"offset %u of %zu but the size of dex file header is %zu",
GetLocation().c_str(),
i,
dex_file_location.c_str(),
dex_file_offset,
DexSize(),
sizeof(DexFile::Header));
return false;
}
dex_file_pointer = DexBegin() + dex_file_offset;
}
const bool valid_magic = DexFileLoader::IsMagicValid(dex_file_pointer);
if (UNLIKELY(!valid_magic)) {
*error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zu for '%s' with invalid "
"dex file magic '%s'",
GetLocation().c_str(),
i,
dex_file_location.c_str(),
dex_file_pointer);
return false;
}
if (UNLIKELY(!DexFileLoader::IsVersionAndMagicValid(dex_file_pointer))) {
*error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zu for '%s' with invalid "
"dex file version '%s'",
GetLocation().c_str(),
i,
dex_file_location.c_str(),
dex_file_pointer);
return false;
}
const DexFile::Header* header = reinterpret_cast<const DexFile::Header*>(dex_file_pointer);
if (dex_file_offset != 0 && (DexSize() - dex_file_offset < header->file_size_)) {
*error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zu for '%s' with dex file "
"offset %u and size %u truncated at %zu",
GetLocation().c_str(),
i,
dex_file_location.c_str(),
dex_file_offset,
header->file_size_,
DexSize());
return false;
}
uint32_t class_offsets_offset;
if (UNLIKELY(!ReadOatDexFileData(*this, &oat, &class_offsets_offset))) {
*error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zu for '%s' truncated "
"after class offsets offset",
GetLocation().c_str(),
i,
dex_file_location.c_str());
return false;
}
if (UNLIKELY(class_offsets_offset > Size()) ||
UNLIKELY((Size() - class_offsets_offset) / sizeof(uint32_t) < header->class_defs_size_)) {
*error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zu for '%s' with truncated "
"class offsets, offset %u of %zu, class defs %u",
GetLocation().c_str(),
i,
dex_file_location.c_str(),
class_offsets_offset,
Size(),
header->class_defs_size_);
return false;
}
if (UNLIKELY(!IsAligned<alignof(uint32_t)>(class_offsets_offset))) {
*error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zu for '%s' with unaligned "
"class offsets, offset %u",
GetLocation().c_str(),
i,
dex_file_location.c_str(),
class_offsets_offset);
return false;
}
const uint32_t* class_offsets_pointer =
reinterpret_cast<const uint32_t*>(Begin() + class_offsets_offset);
uint32_t lookup_table_offset;
if (UNLIKELY(!ReadOatDexFileData(*this, &oat, &lookup_table_offset))) {
*error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zd for '%s' truncated "
"after lookup table offset",
GetLocation().c_str(),
i,
dex_file_location.c_str());
return false;
}
const uint8_t* lookup_table_data = lookup_table_offset != 0u
? Begin() + lookup_table_offset
: nullptr;
if (lookup_table_offset != 0u &&
(UNLIKELY(lookup_table_offset > Size()) ||
UNLIKELY(Size() - lookup_table_offset <
TypeLookupTable::RawDataLength(header->class_defs_size_)))) {
*error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zu for '%s' with truncated "
"type lookup table, offset %u of %zu, class defs %u",
GetLocation().c_str(),
i,
dex_file_location.c_str(),
lookup_table_offset,
Size(),
header->class_defs_size_);
return false;
}
uint32_t dex_layout_sections_offset;
if (UNLIKELY(!ReadOatDexFileData(*this, &oat, &dex_layout_sections_offset))) {
*error_msg = StringPrintf("In oat file '%s' found OatDexFile #%zd for '%s' truncated "
"after dex layout sections offset",
GetLocation().c_str(),
i,
dex_file_location.c_str());
return false;
}
const DexLayoutSections* const dex_layout_sections = dex_layout_sections_offset != 0
? reinterpret_cast<const DexLayoutSections*>(Begin() + dex_layout_sections_offset)
: nullptr;
const IndexBssMapping* method_bss_mapping;
const IndexBssMapping* type_bss_mapping;
const IndexBssMapping* string_bss_mapping;
if (!ReadIndexBssMapping(
this, &oat, i, dex_file_location, "method", &method_bss_mapping, error_msg) ||
!ReadIndexBssMapping(
this, &oat, i, dex_file_location, "type", &type_bss_mapping, error_msg) ||
!ReadIndexBssMapping(
this, &oat, i, dex_file_location, "string", &string_bss_mapping, error_msg)) {
return false;
}
DCheckIndexToBssMapping(
this, header->method_ids_size_, static_cast<size_t>(pointer_size), method_bss_mapping);
DCheckIndexToBssMapping(
this, header->type_ids_size_, sizeof(GcRoot<mirror::Class>), type_bss_mapping);
DCheckIndexToBssMapping(
this, header->string_ids_size_, sizeof(GcRoot<mirror::String>), string_bss_mapping);
std::string canonical_location =
DexFileLoader::GetDexCanonicalLocation(dex_file_location.c_str());
// Create the OatDexFile and add it to the owning container.
OatDexFile* oat_dex_file = new OatDexFile(this,
dex_file_location,
canonical_location,
dex_file_checksum,
dex_file_pointer,
lookup_table_data,
method_bss_mapping,
type_bss_mapping,
string_bss_mapping,
class_offsets_pointer,
dex_layout_sections);
oat_dex_files_storage_.push_back(oat_dex_file);
// Add the location and canonical location (if different) to the oat_dex_files_ table.
StringPiece key(oat_dex_file->GetDexFileLocation());
oat_dex_files_.Put(key, oat_dex_file);
if (canonical_location != dex_file_location) {
StringPiece canonical_key(oat_dex_file->GetCanonicalDexFileLocation());
oat_dex_files_.Put(canonical_key, oat_dex_file);
}
}
Runtime* runtime = Runtime::Current();
if (DataBimgRelRoBegin() != nullptr) {
// Make .data.bimg.rel.ro read only. ClassLinker shall make it writable for relocation.
uint8_t* reloc_begin = const_cast<uint8_t*>(DataBimgRelRoBegin());
CheckedCall(mprotect, "protect relocations", reloc_begin, DataBimgRelRoSize(), PROT_READ);
if (UNLIKELY(runtime == nullptr)) {
// This must be oatdump without boot image.
} else if (!IsExecutable()) {
// Do not check whether we have a boot image if the oat file is not executable.
} else if (UNLIKELY(runtime->GetHeap()->GetBootImageSpaces().empty())) {
*error_msg = StringPrintf("Cannot load oat file '%s' with .data.bimg.rel.ro as executable "
"without boot image.",
GetLocation().c_str());
return false;
} else {
// ClassLinker shall perform the relocation when we register a dex file from
// this oat file. We do not do the relocation here to avoid dirtying the pages
// if the code is never actually ready to be executed.
}
}
return true;
}
////////////////////////
// OatFile via dlopen //
////////////////////////
class DlOpenOatFile final : public OatFileBase {
public:
DlOpenOatFile(const std::string& filename, bool executable)
: OatFileBase(filename, executable),
dlopen_handle_(nullptr),
shared_objects_before_(0) {
}
~DlOpenOatFile() {
if (dlopen_handle_ != nullptr) {
if (!kIsTargetBuild) {
MutexLock mu(Thread::Current(), *Locks::host_dlopen_handles_lock_);
host_dlopen_handles_.erase(dlopen_handle_);
dlclose(dlopen_handle_);
} else {
dlclose(dlopen_handle_);
}
}
}
protected:
const uint8_t* FindDynamicSymbolAddress(const std::string& symbol_name,
std::string* error_msg) const override {
const uint8_t* ptr =
reinterpret_cast<const uint8_t*>(dlsym(dlopen_handle_, symbol_name.c_str()));
if (ptr == nullptr) {
*error_msg = dlerror();
}
return ptr;
}
void PreLoad() override;
bool Load(const std::string& elf_filename,
bool writable,
bool executable,
bool low_4gb,
/*inout*/MemMap* reservation, // Where to load if not null.
/*out*/std::string* error_msg) override;
bool Load(int oat_fd ATTRIBUTE_UNUSED,
bool writable ATTRIBUTE_UNUSED,
bool executable ATTRIBUTE_UNUSED,
bool low_4gb ATTRIBUTE_UNUSED,
/*inout*/MemMap* reservation ATTRIBUTE_UNUSED,
/*out*/std::string* error_msg ATTRIBUTE_UNUSED) override {
return false;
}
// Ask the linker where it mmaped the file and notify our mmap wrapper of the regions.
void PreSetup(const std::string& elf_filename) override;
private:
bool Dlopen(const std::string& elf_filename,
/*inout*/MemMap* reservation, // Where to load if not null.
/*out*/std::string* error_msg);
// On the host, if the same library is loaded again with dlopen the same
// file handle is returned. This differs from the behavior of dlopen on the
// target, where dlopen reloads the library at a different address every
// time you load it. The runtime relies on the target behavior to ensure
// each instance of the loaded library has a unique dex cache. To avoid
// problems, we fall back to our own linker in the case when the same
// library is opened multiple times on host. dlopen_handles_ is used to
// detect that case.
// Guarded by host_dlopen_handles_lock_;
static std::unordered_set<void*> host_dlopen_handles_;
// Reservation and dummy memory map objects corresponding to the regions mapped by dlopen.
// Note: Must be destroyed after dlclose() as it can hold the owning reservation.
std::vector<MemMap> dlopen_mmaps_;
// dlopen handle during runtime.
void* dlopen_handle_; // TODO: Unique_ptr with custom deleter.
// The number of shared objects the linker told us about before loading. Used to
// (optimistically) optimize the PreSetup stage (see comment there).
size_t shared_objects_before_;
DISALLOW_COPY_AND_ASSIGN(DlOpenOatFile);
};
std::unordered_set<void*> DlOpenOatFile::host_dlopen_handles_;
void DlOpenOatFile::PreLoad() {
#ifdef __APPLE__
UNUSED(shared_objects_before_);
LOG(FATAL) << "Should not reach here.";
UNREACHABLE();
#else
// Count the entries in dl_iterate_phdr we get at this point in time.
struct dl_iterate_context {
static int callback(dl_phdr_info* info ATTRIBUTE_UNUSED,
size_t size ATTRIBUTE_UNUSED,
void* data) {
reinterpret_cast<dl_iterate_context*>(data)->count++;
return 0; // Continue iteration.
}
size_t count = 0;
} context;
dl_iterate_phdr(dl_iterate_context::callback, &context);
shared_objects_before_ = context.count;
#endif
}
bool DlOpenOatFile::Load(const std::string& elf_filename,
bool writable,
bool executable,
bool low_4gb,
/*inout*/MemMap* reservation, // Where to load if not null.
/*out*/std::string* error_msg) {
// Use dlopen only when flagged to do so, and when it's OK to load things executable.
// TODO: Also try when not executable? The issue here could be re-mapping as writable (as
// !executable is a sign that we may want to patch), which may not be allowed for
// various reasons.
if (!kUseDlopen) {
*error_msg = "DlOpen is disabled.";
return false;
}
if (low_4gb) {
*error_msg = "DlOpen does not support low 4gb loading.";
return false;
}
if (writable) {
*error_msg = "DlOpen does not support writable loading.";
return false;
}
if (!executable) {
*error_msg = "DlOpen does not support non-executable loading.";
return false;
}
// dlopen always returns the same library if it is already opened on the host. For this reason
// we only use dlopen if we are the target or we do not already have the dex file opened. Having
// the same library loaded multiple times at different addresses is required for class unloading
// and for having dex caches arrays in the .bss section.
if (!kIsTargetBuild) {
if (!kUseDlopenOnHost) {
*error_msg = "DlOpen disabled for host.";
return false;
}
}
bool success = Dlopen(elf_filename, reservation, error_msg);
DCHECK(dlopen_handle_ != nullptr || !success);
return success;
}
bool DlOpenOatFile::Dlopen(const std::string& elf_filename,
/*inout*/MemMap* reservation,
/*out*/std::string* error_msg) {
#ifdef __APPLE__
// The dl_iterate_phdr syscall is missing. There is similar API on OSX,
// but let's fallback to the custom loading code for the time being.
UNUSED(elf_filename, reservation);
*error_msg = "Dlopen unsupported on Mac.";
return false;
#else
{
UniqueCPtr<char> absolute_path(realpath(elf_filename.c_str(), nullptr));
if (absolute_path == nullptr) {
*error_msg = StringPrintf("Failed to find absolute path for '%s'", elf_filename.c_str());
return false;
}
#ifdef ART_TARGET_ANDROID
android_dlextinfo extinfo = {};
extinfo.flags = ANDROID_DLEXT_FORCE_LOAD; // Force-load, don't reuse handle
// (open oat files multiple times).
if (reservation != nullptr) {
if (!reservation->IsValid()) {
*error_msg = StringPrintf("Invalid reservation for %s", elf_filename.c_str());
return false;
}
extinfo.flags |= ANDROID_DLEXT_RESERVED_ADDRESS; // Use the reserved memory range.
extinfo.reserved_addr = reservation->Begin();
extinfo.reserved_size = reservation->Size();
}
dlopen_handle_ = android_dlopen_ext(absolute_path.get(), RTLD_NOW, &extinfo);
if (reservation != nullptr && dlopen_handle_ != nullptr) {
// Find used pages from the reservation.
struct dl_iterate_context {
static int callback(dl_phdr_info* info, size_t size ATTRIBUTE_UNUSED, void* data) {
auto* context = reinterpret_cast<dl_iterate_context*>(data);
static_assert(std::is_same<Elf32_Half, Elf64_Half>::value, "Half must match");
using Elf_Half = Elf64_Half;
// See whether this callback corresponds to the file which we have just loaded.
uint8_t* reservation_begin = context->reservation->Begin();
bool contained_in_reservation = false;
for (Elf_Half i = 0; i < info->dlpi_phnum; i++) {
if (info->dlpi_phdr[i].p_type == PT_LOAD) {
uint8_t* vaddr = reinterpret_cast<uint8_t*>(info->dlpi_addr +
info->dlpi_phdr[i].p_vaddr);
size_t memsz = info->dlpi_phdr[i].p_memsz;
size_t offset = static_cast<size_t>(vaddr - reservation_begin);
if (offset < context->reservation->Size()) {
contained_in_reservation = true;
DCHECK_LE(memsz, context->reservation->Size() - offset);
} else if (vaddr < reservation_begin) {
// Check that there's no overlap with the reservation.
DCHECK_LE(memsz, static_cast<size_t>(reservation_begin - vaddr));
}
break; // It is sufficient to check the first PT_LOAD header.
}
}
if (contained_in_reservation) {
for (Elf_Half i = 0; i < info->dlpi_phnum; i++) {
if (info->dlpi_phdr[i].p_type == PT_LOAD) {
uint8_t* vaddr = reinterpret_cast<uint8_t*>(info->dlpi_addr +
info->dlpi_phdr[i].p_vaddr);
size_t memsz = info->dlpi_phdr[i].p_memsz;
size_t offset = static_cast<size_t>(vaddr - reservation_begin);
DCHECK_LT(offset, context->reservation->Size());
DCHECK_LE(memsz, context->reservation->Size() - offset);
context->max_size = std::max(context->max_size, offset + memsz);
}
}
return 1; // Stop iteration and return 1 from dl_iterate_phdr.
}
return 0; // Continue iteration and return 0 from dl_iterate_phdr when finished.
}
const MemMap* const reservation;
size_t max_size = 0u;
};
dl_iterate_context context = { reservation };
if (dl_iterate_phdr(dl_iterate_context::callback, &context) == 0) {
LOG(FATAL) << "Could not find the shared object mmapped to the reservation.";
UNREACHABLE();
}
// Take ownership of the memory used by the shared object. dlopen() does not assume
// full ownership of this memory and dlclose() shall just remap it as zero pages with
// PROT_NONE. We need to unmap the memory when destroying this oat file.
dlopen_mmaps_.push_back(reservation->TakeReservedMemory(context.max_size));
}
#else
static_assert(!kIsTargetBuild || kIsTargetLinux || kIsTargetFuchsia,
"host_dlopen_handles_ will leak handles");
if (reservation != nullptr) {
*error_msg = StringPrintf("dlopen() into reserved memory is unsupported on host for '%s'.",
elf_filename.c_str());
return false;
}
MutexLock mu(Thread::Current(), *Locks::host_dlopen_handles_lock_);
dlopen_handle_ = dlopen(absolute_path.get(), RTLD_NOW);
if (dlopen_handle_ != nullptr) {
if (!host_dlopen_handles_.insert(dlopen_handle_).second) {
dlclose(dlopen_handle_);
dlopen_handle_ = nullptr;
*error_msg = StringPrintf("host dlopen re-opened '%s'", elf_filename.c_str());
return false;
}
}
#endif // ART_TARGET_ANDROID
}
if (dlopen_handle_ == nullptr) {
*error_msg = StringPrintf("Failed to dlopen '%s': %s", elf_filename.c_str(), dlerror());
return false;
}
return true;
#endif
}
void DlOpenOatFile::PreSetup(const std::string& elf_filename) {
#ifdef __APPLE__
UNUSED(elf_filename);
LOG(FATAL) << "Should not reach here.";
UNREACHABLE();
#else
struct dl_iterate_context {
static int callback(dl_phdr_info* info, size_t size ATTRIBUTE_UNUSED, void* data) {
auto* context = reinterpret_cast<dl_iterate_context*>(data);
static_assert(std::is_same<Elf32_Half, Elf64_Half>::value, "Half must match");
using Elf_Half = Elf64_Half;
context->shared_objects_seen++;
if (context->shared_objects_seen < context->shared_objects_before) {
// We haven't been called yet for anything we haven't seen before. Just continue.
// Note: this is aggressively optimistic. If another thread was unloading a library,
// we may miss out here. However, this does not happen often in practice.
return 0;
}
// See whether this callback corresponds to the file which we have just loaded.
bool contains_begin = false;
for (Elf_Half i = 0; i < info->dlpi_phnum; i++) {
if (info->dlpi_phdr[i].p_type == PT_LOAD) {
uint8_t* vaddr = reinterpret_cast<uint8_t*>(info->dlpi_addr +
info->dlpi_phdr[i].p_vaddr);
size_t memsz = info->dlpi_phdr[i].p_memsz;
if (vaddr <= context->begin_ && context->begin_ < vaddr + memsz) {
contains_begin = true;
break;
}
}
}
// Add dummy mmaps for this file.
if (contains_begin) {
for (Elf_Half i = 0; i < info->dlpi_phnum; i++) {
if (info->dlpi_phdr[i].p_type == PT_LOAD) {
uint8_t* vaddr = reinterpret_cast<uint8_t*>(info->dlpi_addr +
info->dlpi_phdr[i].p_vaddr);
size_t memsz = info->dlpi_phdr[i].p_memsz;
MemMap mmap = MemMap::MapDummy(info->dlpi_name, vaddr, memsz);
context->dlopen_mmaps_->push_back(std::move(mmap));
}
}
return 1; // Stop iteration and return 1 from dl_iterate_phdr.
}
return 0; // Continue iteration and return 0 from dl_iterate_phdr when finished.
}
const uint8_t* const begin_;
std::vector<MemMap>* const dlopen_mmaps_;
const size_t shared_objects_before;
size_t shared_objects_seen;
};
dl_iterate_context context = { Begin(), &dlopen_mmaps_, shared_objects_before_, 0};
if (dl_iterate_phdr(dl_iterate_context::callback, &context) == 0) {
// Hm. Maybe our optimization went wrong. Try another time with shared_objects_before == 0
// before giving up. This should be unusual.
VLOG(oat) << "Need a second run in PreSetup, didn't find with shared_objects_before="
<< shared_objects_before_;
dl_iterate_context context0 = { Begin(), &dlopen_mmaps_, 0, 0};
if (dl_iterate_phdr(dl_iterate_context::callback, &context0) == 0) {
// OK, give up and print an error.
PrintFileToLog("/proc/self/maps", android::base::LogSeverity::WARNING);
LOG(ERROR) << "File " << elf_filename << " loaded with dlopen but cannot find its mmaps.";
}
}
#endif
}
////////////////////////////////////////////////
// OatFile via our own ElfFile implementation //
////////////////////////////////////////////////
class ElfOatFile final : public OatFileBase {
public:
ElfOatFile(const std::string& filename, bool executable) : OatFileBase(filename, executable) {}
static ElfOatFile* OpenElfFile(int zip_fd,
File* file,
const std::string& location,
bool writable,
bool executable,
bool low_4gb,
const char* abs_dex_location,
/*inout*/MemMap* reservation, // Where to load if not null.
/*out*/std::string* error_msg);
bool InitializeFromElfFile(int zip_fd,
ElfFile* elf_file,
VdexFile* vdex_file,
const char* abs_dex_location,
std::string* error_msg);
protected:
const uint8_t* FindDynamicSymbolAddress(const std::string& symbol_name,
std::string* error_msg) const override {
const uint8_t* ptr = elf_file_->FindDynamicSymbolAddress(symbol_name);
if (ptr == nullptr) {
*error_msg = "(Internal implementation could not find symbol)";
}
return ptr;
}
void PreLoad() override {
}
bool Load(const std::string& elf_filename,
bool writable,
bool executable,
bool low_4gb,
/*inout*/MemMap* reservation, // Where to load if not null.
/*out*/std::string* error_msg) override;
bool Load(int oat_fd,
bool writable,
bool executable,
bool low_4gb,
/*inout*/MemMap* reservation, // Where to load if not null.
/*out*/std::string* error_msg) override;
void PreSetup(const std::string& elf_filename ATTRIBUTE_UNUSED) override {
}
private:
bool ElfFileOpen(File* file,
bool writable,
bool executable,
bool low_4gb,
/*inout*/MemMap* reservation, // Where to load if not null.
/*out*/std::string* error_msg);
private:
// Backing memory map for oat file during cross compilation.
std::unique_ptr<ElfFile> elf_file_;
DISALLOW_COPY_AND_ASSIGN(ElfOatFile);
};
ElfOatFile* ElfOatFile::OpenElfFile(int zip_fd,
File* file,
const std::string& location,
bool writable,
bool executable,
bool low_4gb,
const char* abs_dex_location,
/*inout*/MemMap* reservation, // Where to load if not null.
/*out*/std::string* error_msg) {
ScopedTrace trace("Open elf file " + location);
std::unique_ptr<ElfOatFile> oat_file(new ElfOatFile(location, executable));
bool success = oat_file->ElfFileOpen(file,
writable,
low_4gb,
executable,
reservation,
error_msg);
if (!success) {
CHECK(!error_msg->empty());
return nullptr;
}
// Complete the setup.
if (!oat_file->ComputeFields(file->GetPath(), error_msg)) {
return nullptr;
}
if (!oat_file->Setup(zip_fd, abs_dex_location, error_msg)) {
return nullptr;
}
return oat_file.release();
}
bool ElfOatFile::InitializeFromElfFile(int zip_fd,
ElfFile* elf_file,
VdexFile* vdex_file,
const char* abs_dex_location,
std::string* error_msg) {
ScopedTrace trace(__PRETTY_FUNCTION__);
if (IsExecutable()) {
*error_msg = "Cannot initialize from elf file in executable mode.";
return false;
}
elf_file_.reset(elf_file);
SetVdex(vdex_file);
uint64_t offset, size;
bool has_section = elf_file->GetSectionOffsetAndSize(".rodata", &offset, &size);
CHECK(has_section);
SetBegin(elf_file->Begin() + offset);
SetEnd(elf_file->Begin() + size + offset);
// Ignore the optional .bss section when opening non-executable.
return Setup(zip_fd, abs_dex_location, error_msg);
}
bool ElfOatFile::Load(const std::string& elf_filename,
bool writable,
bool executable,
bool low_4gb,
/*inout*/MemMap* reservation,
/*out*/std::string* error_msg) {
ScopedTrace trace(__PRETTY_FUNCTION__);
std::unique_ptr<File> file(OS::OpenFileForReading(elf_filename.c_str()));
if (file == nullptr) {
*error_msg = StringPrintf("Failed to open oat filename for reading: %s", strerror(errno));
return false;
}
return ElfOatFile::ElfFileOpen(file.get(),
writable,
executable,
low_4gb,
reservation,
error_msg);
}
bool ElfOatFile::Load(int oat_fd,
bool writable,
bool executable,
bool low_4gb,
/*inout*/MemMap* reservation,
/*out*/std::string* error_msg) {
ScopedTrace trace(__PRETTY_FUNCTION__);
if (oat_fd != -1) {
int duped_fd = DupCloexec(oat_fd);
std::unique_ptr<File> file = std::make_unique<File>(duped_fd, false);
if (file == nullptr) {
*error_msg = StringPrintf("Failed to open oat filename for reading: %s",
strerror(errno));
return false;
}
return ElfOatFile::ElfFileOpen(file.get(),
writable,
executable,
low_4gb,
reservation,
error_msg);
}
return false;
}
bool ElfOatFile::ElfFileOpen(File* file,
bool writable,
bool executable,
bool low_4gb,
/*inout*/MemMap* reservation,
/*out*/std::string* error_msg) {
ScopedTrace trace(__PRETTY_FUNCTION__);
elf_file_.reset(ElfFile::Open(file,
writable,
/*program_header_only=*/ true,
low_4gb,
error_msg));
if (elf_file_ == nullptr) {
DCHECK(!error_msg->empty());
return false;
}
bool loaded = elf_file_->Load(file, executable, low_4gb, reservation, error_msg);
DCHECK(loaded || !error_msg->empty());
return loaded;
}
//////////////////////////
// General OatFile code //
//////////////////////////
std::string OatFile::ResolveRelativeEncodedDexLocation(
const char* abs_dex_location, const std::string& rel_dex_location) {
// For host, we still do resolution as the rel_dex_location might be absolute
// for a target dex (for example /system/foo/foo.apk).
if (abs_dex_location != nullptr && (rel_dex_location[0] != '/' || !kIsTargetBuild)) {
// Strip :classes<N>.dex used for secondary multidex files.
std::string base = DexFileLoader::GetBaseLocation(rel_dex_location);
std::string multidex_suffix = DexFileLoader::GetMultiDexSuffix(rel_dex_location);
// Check if the base is a suffix of the provided abs_dex_location.
std::string target_suffix = ((rel_dex_location[0] != '/') ? "/" : "") + base;
std::string abs_location(abs_dex_location);
if (abs_location.size() > target_suffix.size()) {
size_t pos = abs_location.size() - target_suffix.size();
if (abs_location.compare(pos, std::string::npos, target_suffix) == 0) {
return abs_location + multidex_suffix;
}
}
}
return rel_dex_location;
}
static void CheckLocation(const std::string& location) {
CHECK(!location.empty());
}
OatFile* OatFile::OpenWithElfFile(int zip_fd,
ElfFile* elf_file,
VdexFile* vdex_file,
const std::string& location,
const char* abs_dex_location,
std::string* error_msg) {
std::unique_ptr<ElfOatFile> oat_file(new ElfOatFile(location, /*executable=*/ false));
return oat_file->InitializeFromElfFile(zip_fd, elf_file, vdex_file, abs_dex_location, error_msg)
? oat_file.release()
: nullptr;
}
OatFile* OatFile::Open(int zip_fd,
const std::string& oat_filename,
const std::string& oat_location,
bool executable,
bool low_4gb,
const char* abs_dex_location,
/*inout*/MemMap* reservation,
/*out*/std::string* error_msg) {
ScopedTrace trace("Open oat file " + oat_location);
CHECK(!oat_filename.empty()) << oat_location;
CheckLocation(oat_location);
std::string vdex_filename = GetVdexFilename(oat_filename);
// Check that the files even exist, fast-fail.
if (!OS::FileExists(vdex_filename.c_str())) {
*error_msg = StringPrintf("File %s does not exist.", vdex_filename.c_str());
return nullptr;
} else if (!OS::FileExists(oat_filename.c_str())) {
*error_msg = StringPrintf("File %s does not exist.", oat_filename.c_str());
return nullptr;
}
// Try dlopen first, as it is required for native debuggability. This will fail fast if dlopen is
// disabled.
OatFile* with_dlopen = OatFileBase::OpenOatFile<DlOpenOatFile>(zip_fd,
vdex_filename,
oat_filename,
oat_location,
/*writable=*/ false,
executable,
low_4gb,
abs_dex_location,
reservation,
error_msg);
if (with_dlopen != nullptr) {
return with_dlopen;
}
if (kPrintDlOpenErrorMessage) {
LOG(ERROR) << "Failed to dlopen: " << oat_filename << " with error " << *error_msg;
}
// If we aren't trying to execute, we just use our own ElfFile loader for a couple reasons:
//
// On target, dlopen may fail when compiling due to selinux restrictions on installd.
//
// We use our own ELF loader for Quick to deal with legacy apps that
// open a generated dex file by name, remove the file, then open
// another generated dex file with the same name. http://b/10614658
//
// On host, dlopen is expected to fail when cross compiling, so fall back to OpenElfFile.
//
//
// Another independent reason is the absolute placement of boot.oat. dlopen on the host usually
// does honor the virtual address encoded in the ELF file only for ET_EXEC files, not ET_DYN.
OatFile* with_internal = OatFileBase::OpenOatFile<ElfOatFile>(zip_fd,
vdex_filename,
oat_filename,
oat_location,
/*writable=*/ false,
executable,
low_4gb,
abs_dex_location,
reservation,
error_msg);
return with_internal;
}
OatFile* OatFile::Open(int zip_fd,
int vdex_fd,
int oat_fd,
const std::string& oat_location,
bool executable,
bool low_4gb,
const char* abs_dex_location,
/*inout*/MemMap* reservation,
/*out*/std::string* error_msg) {
CHECK(!oat_location.empty()) << oat_location;
std::string vdex_location = GetVdexFilename(oat_location);
OatFile* with_internal = OatFileBase::OpenOatFile<ElfOatFile>(zip_fd,
vdex_fd,
oat_fd,
vdex_location,
oat_location,
/*writable=*/ false,
executable,
low_4gb,
abs_dex_location,
reservation,
error_msg);
return with_internal;
}
OatFile* OatFile::OpenWritable(int zip_fd,
File* file,
const std::string& location,
const char* abs_dex_location,
std::string* error_msg) {
CheckLocation(location);
return ElfOatFile::OpenElfFile(zip_fd,
file,
location,
/*writable=*/ true,
/*executable=*/ false,
/*low_4gb=*/false,
abs_dex_location,
/*reservation=*/ nullptr,
error_msg);
}
OatFile* OatFile::OpenReadable(int zip_fd,
File* file,
const std::string& location,
const char* abs_dex_location,
std::string* error_msg) {
CheckLocation(location);
return ElfOatFile::OpenElfFile(zip_fd,
file,
location,
/*writable=*/ false,
/*executable=*/ false,
/*low_4gb=*/false,
abs_dex_location,
/*reservation=*/ nullptr,
error_msg);
}
OatFile::OatFile(const std::string& location, bool is_executable)
: location_(location),
vdex_(nullptr),
begin_(nullptr),
end_(nullptr),
data_bimg_rel_ro_begin_(nullptr),
data_bimg_rel_ro_end_(nullptr),
bss_begin_(nullptr),
bss_end_(nullptr),
bss_methods_(nullptr),
bss_roots_(nullptr),
is_executable_(is_executable),
vdex_begin_(nullptr),
vdex_end_(nullptr),
secondary_lookup_lock_("OatFile secondary lookup lock", kOatFileSecondaryLookupLock) {
CHECK(!location_.empty());
}
OatFile::~OatFile() {
STLDeleteElements(&oat_dex_files_storage_);
}
const OatHeader& OatFile::GetOatHeader() const {
return *reinterpret_cast<const OatHeader*>(Begin());
}
const uint8_t* OatFile::Begin() const {
CHECK(begin_ != nullptr);
return begin_;
}
const uint8_t* OatFile::End() const {
CHECK(end_ != nullptr);
return end_;
}
const uint8_t* OatFile::DexBegin() const {
return vdex_->Begin();
}
const uint8_t* OatFile::DexEnd() const {
return vdex_->End();
}
ArrayRef<const uint32_t> OatFile::GetBootImageRelocations() const {
if (data_bimg_rel_ro_begin_ != nullptr) {
const uint32_t* relocations = reinterpret_cast<const uint32_t*>(data_bimg_rel_ro_begin_);
const uint32_t* relocations_end = reinterpret_cast<const uint32_t*>(data_bimg_rel_ro_end_);
return ArrayRef<const uint32_t>(relocations, relocations_end - relocations);
} else {
return ArrayRef<const uint32_t>();
}
}
ArrayRef<ArtMethod*> OatFile::GetBssMethods() const {
if (bss_methods_ != nullptr) {
ArtMethod** methods = reinterpret_cast<ArtMethod**>(bss_methods_);
ArtMethod** methods_end =
reinterpret_cast<ArtMethod**>(bss_roots_ != nullptr ? bss_roots_ : bss_end_);
return ArrayRef<ArtMethod*>(methods, methods_end - methods);
} else {
return ArrayRef<ArtMethod*>();
}
}
ArrayRef<GcRoot<mirror::Object>> OatFile::GetBssGcRoots() const {
if (bss_roots_ != nullptr) {
auto* roots = reinterpret_cast<GcRoot<mirror::Object>*>(bss_roots_);
auto* roots_end = reinterpret_cast<GcRoot<mirror::Object>*>(bss_end_);
return ArrayRef<GcRoot<mirror::Object>>(roots, roots_end - roots);
} else {
return ArrayRef<GcRoot<mirror::Object>>();
}
}
const OatDexFile* OatFile::GetOatDexFile(const char* dex_location,
const uint32_t* dex_location_checksum,
std::string* error_msg) const {
// NOTE: We assume here that the canonical location for a given dex_location never
// changes. If it does (i.e. some symlink used by the filename changes) we may return
// an incorrect OatDexFile. As long as we have a checksum to check, we shall return
// an identical file or fail; otherwise we may see some unpredictable failures.
// TODO: Additional analysis of usage patterns to see if this can be simplified
// without any performance loss, for example by not doing the first lock-free lookup.
const OatDexFile* oat_dex_file = nullptr;
StringPiece key(dex_location);
// Try to find the key cheaply in the oat_dex_files_ map which holds dex locations
// directly mentioned in the oat file and doesn't require locking.
auto primary_it = oat_dex_files_.find(key);
if (primary_it != oat_dex_files_.end()) {
oat_dex_file = primary_it->second;
DCHECK(oat_dex_file != nullptr);
} else {
// This dex_location is not one of the dex locations directly mentioned in the
// oat file. The correct lookup is via the canonical location but first see in
// the secondary_oat_dex_files_ whether we've looked up this location before.
MutexLock mu(Thread::Current(), secondary_lookup_lock_);
auto secondary_lb = secondary_oat_dex_files_.lower_bound(key);
if (secondary_lb != secondary_oat_dex_files_.end() && key == secondary_lb->first) {
oat_dex_file = secondary_lb->second; // May be null.
} else {
// We haven't seen this dex_location before, we must check the canonical location.
std::string dex_canonical_location = DexFileLoader::GetDexCanonicalLocation(dex_location);
if (dex_canonical_location != dex_location) {
StringPiece canonical_key(dex_canonical_location);
auto canonical_it = oat_dex_files_.find(canonical_key);
if (canonical_it != oat_dex_files_.end()) {
oat_dex_file = canonical_it->second;
} // else keep null.
} // else keep null.
// Copy the key to the string_cache_ and store the result in secondary map.
string_cache_.emplace_back(key.data(), key.length());
StringPiece key_copy(string_cache_.back());
secondary_oat_dex_files_.PutBefore(secondary_lb, key_copy, oat_dex_file);
}
}
if (oat_dex_file == nullptr) {
if (error_msg != nullptr) {
std::string dex_canonical_location = DexFileLoader::GetDexCanonicalLocation(dex_location);
*error_msg = "Failed to find OatDexFile for DexFile " + std::string(dex_location)
+ " (canonical path " + dex_canonical_location + ") in OatFile " + GetLocation();
}
return nullptr;
}
if (dex_location_checksum != nullptr &&
oat_dex_file->GetDexFileLocationChecksum() != *dex_location_checksum) {
if (error_msg != nullptr) {
std::string dex_canonical_location = DexFileLoader::GetDexCanonicalLocation(dex_location);
std::string checksum = StringPrintf("0x%08x", oat_dex_file->GetDexFileLocationChecksum());
std::string required_checksum = StringPrintf("0x%08x", *dex_location_checksum);
*error_msg = "OatDexFile for DexFile " + std::string(dex_location)
+ " (canonical path " + dex_canonical_location + ") in OatFile " + GetLocation()
+ " has checksum " + checksum + " but " + required_checksum + " was required";
}
return nullptr;
}
return oat_dex_file;
}
OatDexFile::OatDexFile(const OatFile* oat_file,
const std::string& dex_file_location,
const std::string& canonical_dex_file_location,
uint32_t dex_file_location_checksum,
const uint8_t* dex_file_pointer,
const uint8_t* lookup_table_data,
const IndexBssMapping* method_bss_mapping_data,
const IndexBssMapping* type_bss_mapping_data,
const IndexBssMapping* string_bss_mapping_data,
const uint32_t* oat_class_offsets_pointer,
const DexLayoutSections* dex_layout_sections)
: oat_file_(oat_file),
dex_file_location_(dex_file_location),
canonical_dex_file_location_(canonical_dex_file_location),
dex_file_location_checksum_(dex_file_location_checksum),
dex_file_pointer_(dex_file_pointer),
lookup_table_data_(lookup_table_data),
method_bss_mapping_(method_bss_mapping_data),
type_bss_mapping_(type_bss_mapping_data),
string_bss_mapping_(string_bss_mapping_data),
oat_class_offsets_pointer_(oat_class_offsets_pointer),
lookup_table_(),
dex_layout_sections_(dex_layout_sections) {
// Initialize TypeLookupTable.
if (lookup_table_data_ != nullptr) {
// Peek the number of classes from the DexFile.
const DexFile::Header* dex_header = reinterpret_cast<const DexFile::Header*>(dex_file_pointer_);
const uint32_t num_class_defs = dex_header->class_defs_size_;
if (lookup_table_data_ + TypeLookupTable::RawDataLength(num_class_defs) > GetOatFile()->End()) {
LOG(WARNING) << "found truncated lookup table in " << dex_file_location_;
} else {
const uint8_t* dex_data = dex_file_pointer_;
// TODO: Clean this up to create the type lookup table after the dex file has been created?
if (CompactDexFile::IsMagicValid(dex_header->magic_)) {
dex_data += dex_header->data_off_;
}
lookup_table_ = TypeLookupTable::Open(dex_data, lookup_table_data_, num_class_defs);
}
}
}
OatDexFile::OatDexFile(TypeLookupTable&& lookup_table) : lookup_table_(std::move(lookup_table)) {}
OatDexFile::~OatDexFile() {}
size_t OatDexFile::FileSize() const {
return reinterpret_cast<const DexFile::Header*>(dex_file_pointer_)->file_size_;
}
std::unique_ptr<const DexFile> OatDexFile::OpenDexFile(std::string* error_msg) const {
ScopedTrace trace(__PRETTY_FUNCTION__);
static constexpr bool kVerify = false;
static constexpr bool kVerifyChecksum = false;
const ArtDexFileLoader dex_file_loader;
return dex_file_loader.Open(dex_file_pointer_,
FileSize(),
dex_file_location_,
dex_file_location_checksum_,
this,
kVerify,
kVerifyChecksum,
error_msg);
}
uint32_t OatDexFile::GetOatClassOffset(uint16_t class_def_index) const {
return oat_class_offsets_pointer_[class_def_index];
}
OatFile::OatClass OatDexFile::GetOatClass(uint16_t class_def_index) const {
uint32_t oat_class_offset = GetOatClassOffset(class_def_index);
const uint8_t* oat_class_pointer = oat_file_->Begin() + oat_class_offset;
CHECK_LT(oat_class_pointer, oat_file_->End()) << oat_file_->GetLocation();
const uint8_t* status_pointer = oat_class_pointer;
CHECK_LT(status_pointer, oat_file_->End()) << oat_file_->GetLocation();
ClassStatus status = enum_cast<ClassStatus>(*reinterpret_cast<const int16_t*>(status_pointer));
CHECK_LE(status, ClassStatus::kLast);
const uint8_t* type_pointer = status_pointer + sizeof(uint16_t);
CHECK_LT(type_pointer, oat_file_->End()) << oat_file_->GetLocation();
OatClassType type = static_cast<OatClassType>(*reinterpret_cast<const uint16_t*>(type_pointer));
CHECK_LT(type, kOatClassMax);
const uint8_t* after_type_pointer = type_pointer + sizeof(int16_t);
CHECK_LE(after_type_pointer, oat_file_->End()) << oat_file_->GetLocation();
uint32_t bitmap_size = 0;
const uint8_t* bitmap_pointer = nullptr;
const uint8_t* methods_pointer = nullptr;
if (type != kOatClassNoneCompiled) {
if (type == kOatClassSomeCompiled) {
bitmap_size = static_cast<uint32_t>(*reinterpret_cast<const uint32_t*>(after_type_pointer));
bitmap_pointer = after_type_pointer + sizeof(bitmap_size);
CHECK_LE(bitmap_pointer, oat_file_->End()) << oat_file_->GetLocation();
methods_pointer = bitmap_pointer + bitmap_size;
} else {
methods_pointer = after_type_pointer;
}
CHECK_LE(methods_pointer, oat_file_->End()) << oat_file_->GetLocation();
}
return OatFile::OatClass(oat_file_,
status,
type,
bitmap_size,
reinterpret_cast<const uint32_t*>(bitmap_pointer),
reinterpret_cast<const OatMethodOffsets*>(methods_pointer));
}
const DexFile::ClassDef* OatDexFile::FindClassDef(const DexFile& dex_file,
const char* descriptor,
size_t hash) {
const OatDexFile* oat_dex_file = dex_file.GetOatDexFile();
DCHECK_EQ(ComputeModifiedUtf8Hash(descriptor), hash);
bool used_lookup_table = false;
const DexFile::ClassDef* lookup_table_classdef = nullptr;
if (LIKELY((oat_dex_file != nullptr) && oat_dex_file->GetTypeLookupTable().Valid())) {
used_lookup_table = true;
const uint32_t class_def_idx = oat_dex_file->GetTypeLookupTable().Lookup(descriptor, hash);
lookup_table_classdef = (class_def_idx != dex::kDexNoIndex)
? &dex_file.GetClassDef(class_def_idx)
: nullptr;
if (!kIsDebugBuild) {
return lookup_table_classdef;
}
}
// Fast path for rare no class defs case.
const uint32_t num_class_defs = dex_file.NumClassDefs();
if (num_class_defs == 0) {
DCHECK(!used_lookup_table);
return nullptr;
}
const DexFile::TypeId* type_id = dex_file.FindTypeId(descriptor);
if (type_id != nullptr) {
dex::TypeIndex type_idx = dex_file.GetIndexForTypeId(*type_id);
const DexFile::ClassDef* found_class_def = dex_file.FindClassDef(type_idx);
if (kIsDebugBuild && used_lookup_table) {
DCHECK_EQ(found_class_def, lookup_table_classdef);
}
return found_class_def;
}
return nullptr;
}
// Madvise the dex file based on the state we are moving to.
void OatDexFile::MadviseDexFile(const DexFile& dex_file, MadviseState state) {
Runtime* const runtime = Runtime::Current();
const bool low_ram = runtime->GetHeap()->IsLowMemoryMode();
// TODO: Also do madvise hints for non low ram devices.
if (!low_ram) {
return;
}
if (state == MadviseState::kMadviseStateAtLoad && runtime->MAdviseRandomAccess()) {
// Default every dex file to MADV_RANDOM when its loaded by default for low ram devices.
// Other devices have enough page cache to get performance benefits from loading more pages
// into the page cache.
DexLayoutSection::MadviseLargestPageAlignedRegion(dex_file.Begin(),
dex_file.Begin() + dex_file.Size(),
MADV_RANDOM);
}
const OatDexFile* oat_dex_file = dex_file.GetOatDexFile();
if (oat_dex_file != nullptr) {
// Should always be there.
const DexLayoutSections* const sections = oat_dex_file->GetDexLayoutSections();
CHECK(sections != nullptr);
sections->Madvise(&dex_file, state);
}
}
OatFile::OatClass::OatClass(const OatFile* oat_file,
ClassStatus status,
OatClassType type,
uint32_t bitmap_size,
const uint32_t* bitmap_pointer,
const OatMethodOffsets* methods_pointer)
: oat_file_(oat_file), status_(status), type_(type),
bitmap_(bitmap_pointer), methods_pointer_(methods_pointer) {
switch (type_) {
case kOatClassAllCompiled: {
CHECK_EQ(0U, bitmap_size);
CHECK(bitmap_pointer == nullptr);
CHECK(methods_pointer != nullptr);
break;
}
case kOatClassSomeCompiled: {
CHECK_NE(0U, bitmap_size);
CHECK(bitmap_pointer != nullptr);
CHECK(methods_pointer != nullptr);
break;
}
case kOatClassNoneCompiled: {
CHECK_EQ(0U, bitmap_size);
CHECK(bitmap_pointer == nullptr);
CHECK(methods_pointer_ == nullptr);
break;
}
case kOatClassMax: {
LOG(FATAL) << "Invalid OatClassType " << type_;
break;
}
}
}
uint32_t OatFile::OatClass::GetOatMethodOffsetsOffset(uint32_t method_index) const {
const OatMethodOffsets* oat_method_offsets = GetOatMethodOffsets(method_index);
if (oat_method_offsets == nullptr) {
return 0u;
}
return reinterpret_cast<const uint8_t*>(oat_method_offsets) - oat_file_->Begin();
}
const OatMethodOffsets* OatFile::OatClass::GetOatMethodOffsets(uint32_t method_index) const {
// NOTE: We don't keep the number of methods and cannot do a bounds check for method_index.
if (methods_pointer_ == nullptr) {
CHECK_EQ(kOatClassNoneCompiled, type_);
return nullptr;
}
size_t methods_pointer_index;
if (bitmap_ == nullptr) {
CHECK_EQ(kOatClassAllCompiled, type_);
methods_pointer_index = method_index;
} else {
CHECK_EQ(kOatClassSomeCompiled, type_);
if (!BitVector::IsBitSet(bitmap_, method_index)) {
return nullptr;
}
size_t num_set_bits = BitVector::NumSetBits(bitmap_, method_index);
methods_pointer_index = num_set_bits;
}
const OatMethodOffsets& oat_method_offsets = methods_pointer_[methods_pointer_index];
return &oat_method_offsets;
}
const OatFile::OatMethod OatFile::OatClass::GetOatMethod(uint32_t method_index) const {
const OatMethodOffsets* oat_method_offsets = GetOatMethodOffsets(method_index);
if (oat_method_offsets == nullptr) {
return OatMethod(nullptr, 0);
}
if (oat_file_->IsExecutable() ||
Runtime::Current() == nullptr || // This case applies for oatdump.
Runtime::Current()->IsAotCompiler()) {
return OatMethod(oat_file_->Begin(), oat_method_offsets->code_offset_);
}
// We aren't allowed to use the compiled code. We just force it down the interpreted / jit
// version.
return OatMethod(oat_file_->Begin(), 0);
}
void OatFile::OatMethod::LinkMethod(ArtMethod* method) const {
CHECK(method != nullptr);
method->SetEntryPointFromQuickCompiledCode(GetQuickCode());
}
bool OatFile::IsDebuggable() const {
return GetOatHeader().IsDebuggable();
}
CompilerFilter::Filter OatFile::GetCompilerFilter() const {
return GetOatHeader().GetCompilerFilter();
}
std::string OatFile::GetClassLoaderContext() const {
return GetOatHeader().GetStoreValueByKey(OatHeader::kClassPathKey);
}
const char* OatFile::GetCompilationReason() const {
return GetOatHeader().GetStoreValueByKey(OatHeader::kCompilationReasonKey);
}
OatFile::OatClass OatFile::FindOatClass(const DexFile& dex_file,
uint16_t class_def_idx,
bool* found) {
DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16);
const OatDexFile* oat_dex_file = dex_file.GetOatDexFile();
if (oat_dex_file == nullptr || oat_dex_file->GetOatFile() == nullptr) {
*found = false;
return OatFile::OatClass::Invalid();
}
*found = true;
return oat_dex_file->GetOatClass(class_def_idx);
}
void OatDexFile::AssertAotCompiler() {
CHECK(Runtime::Current()->IsAotCompiler());
}
} // namespace art