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aosp12/art/runtime/oat_file.cc

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/*
* 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"
#include "nativeloader/dlext_namespaces.h"
#endif
#include <android-base/logging.h>
#include "android-base/stringprintf.h"
#include "arch/instruction_set_features.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/string_view_cpp20.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.h"
#include "dex/dex_file_loader.h"
#include "dex/dex_file_structs.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/elf_utils.h"
#include "elf_file.h"
#include "gc_root.h"
#include "gc/heap.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-inl.h"
#include "vdex_file.h"
#include "verifier/verifier_deps.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,
ArrayRef<const std::string> dex_filenames,
/*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,
ArrayRef<const std::string> dex_filenames,
/*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, ArrayRef<const std::string> dex_filenames, std::string* error_msg);
bool Setup(const std::vector<const DexFile*>& dex_files, 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:
// Returns true if we want to remove quickened opcodes before loading the VDEX file, false
// otherwise.
bool ShouldUnquickenVDex() const;
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,
ArrayRef<const std::string> dex_filenames,
/*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, dex_filenames, 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,
ArrayRef<const std::string> dex_filenames,
/*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, dex_filenames, error_msg)) {
return nullptr;
}
return ret.release();
}
bool OatFileBase::ShouldUnquickenVDex() const {
// We sometimes load oat files without a runtime (eg oatdump) and don't want to do anything in
// that case. If we are debuggable there are no -quick opcodes to unquicken. If the runtime is not
// debuggable we don't care whether there are -quick opcodes or not so no need to do anything.
Runtime* runtime = Runtime::Current();
return (runtime != nullptr && runtime->IsJavaDebuggable()) &&
// Note: This is called before `OatFileBase::Setup()` where we validate the
// oat file contents. Check that we have at least a valid header, including
// oat file version, to avoid parsing the key-value store for a different
// version (out-of-date oat file) which can lead to crashes. b/179221298.
// TODO: While this is a poor workaround and the correct solution would be
// to postpone the unquickening check until after `OatFileBase::Setup()`,
// we prefer to avoid larger rewrites because quickening is deprecated and
// should be removed completely anyway. b/170086509
(GetOatHeader().IsValid() && !IsDebuggable());
}
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,
ShouldUnquickenVDex(),
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,
ShouldUnquickenVDex(),
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 bool ComputeAndCheckTypeLookupTableData(const DexFile::Header& header,
const uint8_t* type_lookup_table_start,
const VdexFile* vdex_file,
const uint8_t** type_lookup_table_data,
std::string* error_msg) {
if (type_lookup_table_start == nullptr ||
reinterpret_cast<const uint32_t*>(type_lookup_table_start)[0] == 0) {
*type_lookup_table_data = nullptr;
return true;
}
*type_lookup_table_data = type_lookup_table_start + sizeof(uint32_t);
size_t expected_table_size = TypeLookupTable::RawDataLength(header.class_defs_size_);
size_t found_size = reinterpret_cast<const uint32_t*>(type_lookup_table_start)[0];
if (UNLIKELY(found_size != expected_table_size)) {
*error_msg =
StringPrintf("In vdex file '%s' unexpected type lookup table size: found %zu, expected %zu",
vdex_file->GetName().c_str(),
found_size,
expected_table_size);
return false;
}
if (UNLIKELY(!vdex_file->Contains(*type_lookup_table_data))) {
*error_msg =
StringPrintf("In vdex file '%s' found invalid type lookup table pointer %p not in [%p, %p]",
vdex_file->GetName().c_str(),
type_lookup_table_data,
vdex_file->Begin(),
vdex_file->End());
return false;
}
if (UNLIKELY(!vdex_file->Contains(*type_lookup_table_data + expected_table_size - 1))) {
*error_msg =
StringPrintf("In vdex file '%s' found overflowing type lookup table %p not in [%p, %p]",
vdex_file->GetName().c_str(),
type_lookup_table_data + expected_table_size,
vdex_file->Begin(),
vdex_file->End());
return false;
}
if (UNLIKELY(!IsAligned<4>(type_lookup_table_start))) {
*error_msg =
StringPrintf("In vdex file '%s' found invalid type lookup table alignment %p",
vdex_file->GetName().c_str(),
type_lookup_table_start);
return false;
}
return true;
}
bool OatFileBase::Setup(const std::vector<const DexFile*>& dex_files, std::string* error_msg) {
uint32_t i = 0;
const uint8_t* type_lookup_table_start = nullptr;
for (const DexFile* dex_file : dex_files) {
std::string dex_location = dex_file->GetLocation();
std::string canonical_location = DexFileLoader::GetDexCanonicalLocation(dex_location.c_str());
type_lookup_table_start = vdex_->GetNextTypeLookupTableData(type_lookup_table_start, i++);
const uint8_t* type_lookup_table_data = nullptr;
if (!ComputeAndCheckTypeLookupTableData(dex_file->GetHeader(),
type_lookup_table_start,
vdex_.get(),
&type_lookup_table_data,
error_msg)) {
return false;
}
// Create an OatDexFile and add it to the owning container.
OatDexFile* oat_dex_file = new OatDexFile(
this,
dex_file->Begin(),
dex_file->GetLocationChecksum(),
dex_location,
canonical_location,
type_lookup_table_data);
oat_dex_files_storage_.push_back(oat_dex_file);
// Add the location and canonical location (if different) to the oat_dex_files_ table.
std::string_view key(oat_dex_file->GetDexFileLocation());
oat_dex_files_.Put(key, oat_dex_file);
if (canonical_location != dex_location) {
std::string_view canonical_key(oat_dex_file->GetCanonicalDexFileLocation());
oat_dex_files_.Put(canonical_key, oat_dex_file);
}
}
// Now that we've created all the OatDexFile, update the dex files.
for (i = 0; i < dex_files.size(); ++i) {
dex_files[i]->SetOatDexFile(oat_dex_files_storage_[i]);
}
return true;
}
bool OatFileBase::Setup(int zip_fd,
ArrayRef<const std::string> dex_filenames,
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;
}
std::string_view primary_location;
std::string_view primary_location_replacement;
size_t dex_filenames_pos = 0u;
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;
// Location encoded in the oat file. We will use this for multidex naming.
std::string_view oat_dex_file_location(dex_file_location_data, dex_file_location_size);
std::string dex_file_location(oat_dex_file_location);
bool is_multidex = DexFileLoader::IsMultiDexLocation(dex_file_location.c_str());
// Check that `is_multidex` does not clash with other indicators. The first dex location
// must be primary location and, if we're opening external dex files, the location must
// be multi-dex if and only if we already have a dex file opened for it.
if ((i == 0 && is_multidex) ||
(!external_dex_files_.empty() && (is_multidex != (i < external_dex_files_.size())))) {
*error_msg = StringPrintf("In oat file '%s' found unexpected %s location '%s'",
GetLocation().c_str(),
is_multidex ? "multi-dex" : "primary",
dex_file_location.c_str());
return false;
}
// Remember the primary location and, if provided, the replacement from `dex_filenames`.
if (!is_multidex) {
primary_location = oat_dex_file_location;
if (!dex_filenames.empty()) {
if (dex_filenames_pos == dex_filenames.size()) {
*error_msg = StringPrintf("In oat file '%s' found excessive primary location '%s'"
", expected only %zu primary locations",
GetLocation().c_str(),
dex_file_location.c_str(),
dex_filenames.size());
return false;
}
primary_location_replacement = dex_filenames[dex_filenames_pos];
++dex_filenames_pos;
}
}
// Check that the base location of a multidex location matches the last seen primary location.
if (is_multidex &&
(!StartsWith(dex_file_location, primary_location) ||
dex_file_location[primary_location.size()] != DexFileLoader::kMultiDexSeparator)) {
*error_msg = StringPrintf("In oat file '%s' found unexpected multidex location '%s',"
" unrelated to '%s'",
GetLocation().c_str(),
dex_file_location.c_str(),
std::string(primary_location).c_str());
return false;
}
std::string dex_file_name = dex_file_location;
if (!dex_filenames.empty()) {
dex_file_name.replace(/*pos*/ 0u, primary_location.size(), primary_location_replacement);
// If the location does not contain path and matches the file name component,
// use the provided file name also as the location.
// TODO: Do we need this for anything other than tests?
if (dex_file_location.find('/') == std::string::npos &&
dex_file_name.size() > dex_file_location.size() &&
dex_file_name[dex_file_name.size() - dex_file_location.size() - 1u] == '/' &&
EndsWith(dex_file_name, dex_file_location)) {
dex_file_location = dex_file_name;
}
}
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)) {
// Do not support mixed-mode oat files.
if (i != 0u && external_dex_files_.empty()) {
*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;
}
DCHECK_LE(i, external_dex_files_.size());
if (i == external_dex_files_.size()) {
std::vector<std::unique_ptr<const DexFile>> new_dex_files;
// 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,
&new_dex_files);
} else {
loaded = dex_file_loader.Open(dex_file_name.c_str(),
dex_file_location,
/*verify=*/ false,
/*verify_checksum=*/ false,
error_msg,
&new_dex_files);
}
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.
// If we have a zip_fd, or reached the end of provided `dex_filenames`, we must
// load all dex files from that file, otherwise we may open multiple files.
// Note: actual checksum comparisons are the duty of the OatFileAssistant and will be
// done after loading the OatFile.
size_t max_dex_files = dex_file_count - external_dex_files_.size();
bool expect_all =
(zip_fd != -1) || (!dex_filenames.empty() && dex_filenames_pos == dex_filenames.size());
if (expect_all ? new_dex_files.size() != max_dex_files
: new_dex_files.size() > max_dex_files) {
*error_msg = StringPrintf("In oat file '%s', expected %s%zu uncompressed dex files, but "
"found %zu in '%s'",
GetLocation().c_str(),
(expect_all ? "" : "<="),
max_dex_files,
new_dex_files.size(),
dex_file_location.c_str());
return false;
}
for (std::unique_ptr<const DexFile>& dex_file : new_dex_files) {
external_dex_files_.push_back(std::move(dex_file));
}
}
dex_file_pointer = external_dex_files_[i]->Begin();
} else {
// Do not support mixed-mode oat files.
if (!external_dex_files_.empty()) {
*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",
GetLocation().c_str(),
i,
dex_file_location.c_str());
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",
GetLocation().c_str(),
i,
dex_file_location.c_str());
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
? DexBegin() + lookup_table_offset
: nullptr;
if (lookup_table_offset != 0u &&
(UNLIKELY(lookup_table_offset > DexSize()) ||
UNLIKELY(DexSize() - 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* public_type_bss_mapping;
const IndexBssMapping* package_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, "type", &public_type_bss_mapping, error_msg) ||
!ReadIndexBssMapping(
this, &oat, i, dex_file_location, "type", &package_type_bss_mapping, error_msg) ||
!ReadIndexBssMapping(
this, &oat, i, dex_file_location, "string", &string_bss_mapping, error_msg)) {
return false;
}
// Create the OatDexFile and add it to the owning container.
OatDexFile* oat_dex_file = new OatDexFile(
this,
dex_file_location,
DexFileLoader::GetDexCanonicalLocation(dex_file_name.c_str()),
dex_file_checksum,
dex_file_pointer,
lookup_table_data,
method_bss_mapping,
type_bss_mapping,
public_type_bss_mapping,
package_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.
// Note: We do not add the non-canonical `dex_file_name`. If it is different from both
// the location and canonical location, GetOatDexFile() shall canonicalize it when
// requested and match the canonical path.
std::string_view key = oat_dex_file_location; // References oat file data.
std::string_view canonical_key(oat_dex_file->GetCanonicalDexFileLocation());
oat_dex_files_.Put(key, oat_dex_file);
if (canonical_key != key) {
oat_dex_files_.Put(canonical_key, oat_dex_file);
}
}
if (!dex_filenames.empty() && dex_filenames_pos != dex_filenames.size()) {
*error_msg = StringPrintf("Oat file '%s' contains only %zu primary dex locations, expected %zu",
GetLocation().c_str(),
dex_filenames_pos,
dex_filenames.size());
return false;
}
if (DataBimgRelRoBegin() != nullptr) {
// Make .data.bimg.rel.ro read only. ClassLinker shall temporarily make it writable for
// 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.
uint8_t* reloc_begin = const_cast<uint8_t*>(DataBimgRelRoBegin());
CheckedCall(mprotect, "protect relocations", reloc_begin, DataBimgRelRoSize(), PROT_READ);
// Make sure the file lists a boot image dependency, otherwise the .data.bimg.rel.ro
// section is bogus. The full dependency is checked before the code is executed.
// We cannot do this check if we do not have a key-value store, i.e. for secondary
// oat files for boot image extensions.
if (GetOatHeader().GetKeyValueStoreSize() != 0u) {
const char* boot_class_path_checksum =
GetOatHeader().GetStoreValueByKey(OatHeader::kBootClassPathChecksumsKey);
if (boot_class_path_checksum == nullptr ||
boot_class_path_checksum[0] != gc::space::ImageSpace::kImageChecksumPrefix) {
*error_msg = StringPrintf("Oat file '%s' contains .data.bimg.rel.ro section "
"without boot image dependency.",
GetLocation().c_str());
return false;
}
}
}
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 placeholder 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;
}
#ifdef ART_TARGET_ANDROID
static struct android_namespace_t* GetSystemLinkerNamespace() {
static struct android_namespace_t* system_ns = []() {
// The system namespace is called "default" for binaries in /system and
// "system" for those in the ART APEX. Try "system" first since "default"
// always exists.
// TODO(b/185587109): Get rid of this error prone logic.
struct android_namespace_t* ns = android_get_exported_namespace("system");
if (ns == nullptr) {
ns = android_get_exported_namespace("default");
if (ns == nullptr) {
LOG(FATAL) << "Failed to get system namespace for loading OAT files";
}
}
return ns;
}();
return system_ns;
}
#endif // ART_TARGET_ANDROID
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();
}
if (strncmp(kAndroidArtApexDefaultPath,
absolute_path.get(),
sizeof(kAndroidArtApexDefaultPath) - 1) != 0 ||
absolute_path.get()[sizeof(kAndroidArtApexDefaultPath) - 1] != '/') {
// Use the system namespace for OAT files outside the ART APEX. Search
// paths and links don't matter here, but permitted paths do, and the
// system namespace is configured to allow loading from all appropriate
// locations.
extinfo.flags |= ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = GetSystemLinkerNamespace();
}
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 PlaceholderMapData {
const char* name;
uint8_t* vaddr;
size_t memsz;
};
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 placeholder 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;
size_t name_size = strlen(info->dlpi_name) + 1u;
std::vector<char>* placeholder_maps_names = context->placeholder_maps_names_;
// We must not allocate any memory in the callback, see b/156312036 .
if (name_size < placeholder_maps_names->capacity() - placeholder_maps_names->size() &&
context->placeholder_maps_data_->size() <
context->placeholder_maps_data_->capacity()) {
placeholder_maps_names->insert(
placeholder_maps_names->end(), info->dlpi_name, info->dlpi_name + name_size);
const char* name =
&(*placeholder_maps_names)[placeholder_maps_names->size() - name_size];
context->placeholder_maps_data_->push_back({ name, vaddr, memsz });
}
context->num_placeholder_maps_ += 1u;
context->placeholder_maps_names_size_ += name_size;
}
}
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<PlaceholderMapData>* placeholder_maps_data_;
size_t num_placeholder_maps_;
std::vector<char>* placeholder_maps_names_;
size_t placeholder_maps_names_size_;
size_t shared_objects_before;
size_t shared_objects_seen;
};
// We must not allocate any memory in the callback, see b/156312036 .
// Therefore we pre-allocate storage for the data we need for creating the placeholder maps.
std::vector<PlaceholderMapData> placeholder_maps_data;
placeholder_maps_data.reserve(32); // 32 should be enough. If not, we'll retry.
std::vector<char> placeholder_maps_names;
placeholder_maps_names.reserve(4 * KB); // 4KiB should be enough. If not, we'll retry.
dl_iterate_context context = {
Begin(),
&placeholder_maps_data,
/*num_placeholder_maps_*/ 0u,
&placeholder_maps_names,
/*placeholder_maps_names_size_*/ 0u,
shared_objects_before_,
/*shared_objects_seen*/ 0u
};
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_;
DCHECK(placeholder_maps_data.empty());
DCHECK_EQ(context.num_placeholder_maps_, 0u);
DCHECK(placeholder_maps_names.empty());
DCHECK_EQ(context.placeholder_maps_names_size_, 0u);
context.shared_objects_before = 0u;
context.shared_objects_seen = 0u;
if (dl_iterate_phdr(dl_iterate_context::callback, &context) == 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.";
}
}
if (placeholder_maps_data.size() < context.num_placeholder_maps_) {
// Insufficient capacity. Reserve more space and retry.
placeholder_maps_data.clear();
placeholder_maps_data.reserve(context.num_placeholder_maps_);
context.num_placeholder_maps_ = 0u;
placeholder_maps_names.clear();
placeholder_maps_names.reserve(context.placeholder_maps_names_size_);
context.placeholder_maps_names_size_ = 0u;
context.shared_objects_before = 0u;
context.shared_objects_seen = 0u;
bool success = (dl_iterate_phdr(dl_iterate_context::callback, &context) != 0);
CHECK(success);
}
CHECK_EQ(placeholder_maps_data.size(), context.num_placeholder_maps_);
CHECK_EQ(placeholder_maps_names.size(), context.placeholder_maps_names_size_);
DCHECK_EQ(static_cast<size_t>(std::count(placeholder_maps_names.begin(),
placeholder_maps_names.end(), '\0')),
context.num_placeholder_maps_);
for (const PlaceholderMapData& data : placeholder_maps_data) {
MemMap mmap = MemMap::MapPlaceholder(data.name, data.vaddr, data.memsz);
dlopen_mmaps_.push_back(std::move(mmap));
}
#endif
}
////////////////////////////////////////////////
// OatFile via our own ElfFile implementation //
////////////////////////////////////////////////
class ElfOatFile final : public OatFileBase {
public:
ElfOatFile(const std::string& filename, bool executable) : OatFileBase(filename, executable) {}
bool InitializeFromElfFile(int zip_fd,
ElfFile* elf_file,
VdexFile* vdex_file,
ArrayRef<const std::string> dex_filenames,
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);
};
bool ElfOatFile::InitializeFromElfFile(int zip_fd,
ElfFile* elf_file,
VdexFile* vdex_file,
ArrayRef<const std::string> dex_filenames,
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, dex_filenames, 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;
}
class OatFileBackedByVdex final : public OatFileBase {
public:
explicit OatFileBackedByVdex(const std::string& filename)
: OatFileBase(filename, /*executable=*/ false) {}
static OatFileBackedByVdex* Open(const std::vector<const DexFile*>& dex_files,
std::unique_ptr<VdexFile>&& vdex_file,
const std::string& location) {
std::unique_ptr<OatFileBackedByVdex> oat_file(new OatFileBackedByVdex(location));
// SetVdex will take ownership of the VdexFile.
oat_file->SetVdex(vdex_file.release());
oat_file->SetupHeader(dex_files.size());
// Initialize OatDexFiles.
std::string error_msg;
if (!oat_file->Setup(dex_files, &error_msg)) {
LOG(WARNING) << "Could not create in-memory vdex file: " << error_msg;
return nullptr;
}
return oat_file.release();
}
static OatFileBackedByVdex* Open(int zip_fd,
std::unique_ptr<VdexFile>&& unique_vdex_file,
const std::string& dex_location,
std::string* error_msg) {
VdexFile* vdex_file = unique_vdex_file.get();
std::unique_ptr<OatFileBackedByVdex> oat_file(new OatFileBackedByVdex(vdex_file->GetName()));
// SetVdex will take ownership of the VdexFile.
oat_file->SetVdex(unique_vdex_file.release());
if (vdex_file->HasDexSection()) {
uint32_t i = 0;
const uint8_t* type_lookup_table_start = nullptr;
for (const uint8_t* dex_file_start = vdex_file->GetNextDexFileData(nullptr, i);
dex_file_start != nullptr;
dex_file_start = vdex_file->GetNextDexFileData(dex_file_start, ++i)) {
const DexFile::Header* header = reinterpret_cast<const DexFile::Header*>(dex_file_start);
if (UNLIKELY(!vdex_file->Contains(dex_file_start))) {
*error_msg =
StringPrintf("In vdex file '%s' found invalid dex file pointer %p not in [%p, %p]",
dex_location.c_str(),
dex_file_start,
vdex_file->Begin(),
vdex_file->End());
return nullptr;
}
if (UNLIKELY(!vdex_file->Contains(dex_file_start + header->file_size_ - 1))) {
*error_msg =
StringPrintf("In vdex file '%s' found overflowing dex file %p not in [%p, %p]",
dex_location.c_str(),
dex_file_start + header->file_size_,
vdex_file->Begin(),
vdex_file->End());
return nullptr;
}
if (UNLIKELY(!DexFileLoader::IsVersionAndMagicValid(dex_file_start))) {
*error_msg =
StringPrintf("In vdex file '%s' found dex file with invalid dex file version",
dex_location.c_str());
return nullptr;
}
// Create the OatDexFile and add it to the owning container.
std::string location = DexFileLoader::GetMultiDexLocation(i, dex_location.c_str());
std::string canonical_location = DexFileLoader::GetDexCanonicalLocation(location.c_str());
type_lookup_table_start = vdex_file->GetNextTypeLookupTableData(type_lookup_table_start, i);
const uint8_t* type_lookup_table_data = nullptr;
if (!ComputeAndCheckTypeLookupTableData(*header,
type_lookup_table_start,
vdex_file,
&type_lookup_table_data,
error_msg)) {
return nullptr;
}
OatDexFile* oat_dex_file = new OatDexFile(oat_file.get(),
dex_file_start,
vdex_file->GetLocationChecksum(i),
location,
canonical_location,
type_lookup_table_data);
oat_file->oat_dex_files_storage_.push_back(oat_dex_file);
std::string_view key(oat_dex_file->GetDexFileLocation());
oat_file->oat_dex_files_.Put(key, oat_dex_file);
if (canonical_location != location) {
std::string_view canonical_key(oat_dex_file->GetCanonicalDexFileLocation());
oat_file->oat_dex_files_.Put(canonical_key, oat_dex_file);
}
}
oat_file->SetupHeader(oat_file->oat_dex_files_storage_.size());
} else {
// No need for any verification when loading dex files as we already have
// a vdex file.
const ArtDexFileLoader dex_file_loader;
bool loaded = false;
if (zip_fd != -1) {
loaded = dex_file_loader.OpenZip(zip_fd,
dex_location,
/*verify=*/ false,
/*verify_checksum=*/ false,
error_msg,
&oat_file->external_dex_files_);
} else {
loaded = dex_file_loader.Open(dex_location.c_str(),
dex_location,
/*verify=*/ false,
/*verify_checksum=*/ false,
error_msg,
&oat_file->external_dex_files_);
}
if (!loaded) {
return nullptr;
}
oat_file->SetupHeader(oat_file->external_dex_files_.size());
if (!oat_file->Setup(MakeNonOwningPointerVector(oat_file->external_dex_files_), error_msg)) {
return nullptr;
}
}
return oat_file.release();
}
void SetupHeader(size_t number_of_dex_files) {
DCHECK(!IsExecutable());
// Create a fake OatHeader with a key store to help debugging.
std::unique_ptr<const InstructionSetFeatures> isa_features =
InstructionSetFeatures::FromCppDefines();
SafeMap<std::string, std::string> store;
store.Put(OatHeader::kCompilerFilter, CompilerFilter::NameOfFilter(CompilerFilter::kVerify));
store.Put(OatHeader::kCompilationReasonKey, "vdex");
store.Put(OatHeader::kConcurrentCopying,
kUseReadBarrier ? OatHeader::kTrueValue : OatHeader::kFalseValue);
oat_header_.reset(OatHeader::Create(kRuntimeISA,
isa_features.get(),
number_of_dex_files,
&store));
const uint8_t* begin = reinterpret_cast<const uint8_t*>(oat_header_.get());
SetBegin(begin);
SetEnd(begin + oat_header_->GetHeaderSize());
}
protected:
void PreLoad() override {}
bool Load(const std::string& elf_filename ATTRIBUTE_UNUSED,
bool writable ATTRIBUTE_UNUSED,
bool executable ATTRIBUTE_UNUSED,
bool low_4gb ATTRIBUTE_UNUSED,
MemMap* reservation ATTRIBUTE_UNUSED,
std::string* error_msg ATTRIBUTE_UNUSED) override {
LOG(FATAL) << "Unsupported";
UNREACHABLE();
}
bool Load(int oat_fd ATTRIBUTE_UNUSED,
bool writable ATTRIBUTE_UNUSED,
bool executable ATTRIBUTE_UNUSED,
bool low_4gb ATTRIBUTE_UNUSED,
MemMap* reservation ATTRIBUTE_UNUSED,
std::string* error_msg ATTRIBUTE_UNUSED) override {
LOG(FATAL) << "Unsupported";
UNREACHABLE();
}
void PreSetup(const std::string& elf_filename ATTRIBUTE_UNUSED) override {}
const uint8_t* FindDynamicSymbolAddress(const std::string& symbol_name ATTRIBUTE_UNUSED,
std::string* error_msg) const override {
*error_msg = "Unsupported";
return nullptr;
}
private:
std::unique_ptr<OatHeader> oat_header_;
DISALLOW_COPY_AND_ASSIGN(OatFileBackedByVdex);
};
//////////////////////////
// General OatFile code //
//////////////////////////
static void CheckLocation(const std::string& location) {
CHECK(!location.empty());
}
OatFile* OatFile::Open(int zip_fd,
const std::string& oat_filename,
const std::string& oat_location,
bool executable,
bool low_4gb,
ArrayRef<const std::string> dex_filenames,
/*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 vdex file even exists, fast-fail. We don't check the odex
// file as we use the absence of an odex file for test the functionality of
// vdex-only.
if (!OS::FileExists(vdex_filename.c_str())) {
*error_msg = StringPrintf("File %s does not exist.", vdex_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,
dex_filenames,
reservation,
error_msg);
if (with_dlopen != nullptr) {
Runtime* runtime = Runtime::Current();
// The runtime might not be available at this point if we're running
// dex2oat or oatdump.
if (runtime != nullptr) {
size_t madvise_size_limit = runtime->GetMadviseWillNeedSizeOdex();
Runtime::MadviseFileForRange(madvise_size_limit,
with_dlopen->Size(),
with_dlopen->Begin(),
with_dlopen->End(),
oat_location);
}
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 ElfOatFile.
//
//
// 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,
dex_filenames,
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,
ArrayRef<const std::string> dex_filenames,
/*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,
dex_filenames,
reservation,
error_msg);
return with_internal;
}
OatFile* OatFile::OpenFromVdex(const std::vector<const DexFile*>& dex_files,
std::unique_ptr<VdexFile>&& vdex_file,
const std::string& location) {
CheckLocation(location);
return OatFileBackedByVdex::Open(dex_files, std::move(vdex_file), location);
}
OatFile* OatFile::OpenFromVdex(int zip_fd,
std::unique_ptr<VdexFile>&& vdex_file,
const std::string& location,
std::string* error_msg) {
CheckLocation(location);
return OatFileBackedByVdex::Open(zip_fd, std::move(vdex_file), location, 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;
std::string_view 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) {
std::string_view 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());
std::string_view 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* public_type_bss_mapping_data,
const IndexBssMapping* package_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),
public_type_bss_mapping_(public_type_bss_mapping_data),
package_type_bss_mapping_(package_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) {
InitializeTypeLookupTable();
DCHECK(!IsBackedByVdexOnly());
}
void OatDexFile::InitializeTypeLookupTable() {
// 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()->DexEnd()) {
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(const OatFile* oat_file,
const uint8_t* dex_file_pointer,
uint32_t dex_file_location_checksum,
const std::string& dex_file_location,
const std::string& canonical_dex_file_location,
const uint8_t* lookup_table_data)
: 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) {
InitializeTypeLookupTable();
DCHECK(IsBackedByVdexOnly());
}
OatDexFile::OatDexFile(TypeLookupTable&& lookup_table) : lookup_table_(std::move(lookup_table)) {
// Stripped-down OatDexFile only allowed in the compiler, the zygote, or the system server.
CHECK(Runtime::Current() == nullptr ||
Runtime::Current()->IsAotCompiler() ||
Runtime::Current()->IsZygote() ||
Runtime::Current()->IsSystemServer());
}
OatDexFile::~OatDexFile() {}
size_t OatDexFile::FileSize() const {
DCHECK(dex_file_pointer_ != nullptr);
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 {
DCHECK(oat_class_offsets_pointer_ != nullptr);
return oat_class_offsets_pointer_[class_def_index];
}
bool OatDexFile::IsBackedByVdexOnly() const {
return oat_class_offsets_pointer_ == nullptr;
}
OatFile::OatClass OatDexFile::GetOatClass(uint16_t class_def_index) const {
if (IsBackedByVdexOnly()) {
// If there is only a vdex file, return that the class is not ready. The
// caller will have to call `VdexFile::ComputeClassStatus` to compute the
// actual class status, because we need to do the assignability type checks.
return OatFile::OatClass(oat_file_,
ClassStatus::kNotReady,
/* type= */ OatClassType::kNoneCompiled,
/* bitmap_size= */ 0u,
/* bitmap_pointer= */ nullptr,
/* methods_pointer= */ nullptr);
}
uint32_t oat_class_offset = GetOatClassOffset(class_def_index);
CHECK_GE(oat_class_offset, sizeof(OatHeader)) << oat_file_->GetLocation();
CHECK_LT(oat_class_offset, oat_file_->Size()) << oat_file_->GetLocation();
CHECK_LE(/* status */ sizeof(uint16_t) + /* type */ sizeof(uint16_t),
oat_file_->Size() - oat_class_offset) << oat_file_->GetLocation();
const uint8_t* current_pointer = oat_file_->Begin() + oat_class_offset;
uint16_t status_value = *reinterpret_cast<const uint16_t*>(current_pointer);
current_pointer += sizeof(uint16_t);
uint16_t type_value = *reinterpret_cast<const uint16_t*>(current_pointer);
current_pointer += sizeof(uint16_t);
CHECK_LE(status_value, enum_cast<uint8_t>(ClassStatus::kLast))
<< static_cast<uint32_t>(status_value) << " at " << oat_file_->GetLocation();
CHECK_LT(type_value, enum_cast<uint8_t>(OatClassType::kOatClassMax)) << oat_file_->GetLocation();
ClassStatus status = enum_cast<ClassStatus>(status_value);
OatClassType type = enum_cast<OatClassType>(type_value);
uint32_t num_methods = 0;
const uint32_t* bitmap_pointer = nullptr;
const OatMethodOffsets* methods_pointer = nullptr;
if (type != OatClassType::kNoneCompiled) {
CHECK_LE(sizeof(uint32_t), static_cast<size_t>(oat_file_->End() - current_pointer))
<< oat_file_->GetLocation();
num_methods = *reinterpret_cast<const uint32_t*>(current_pointer);
current_pointer += sizeof(uint32_t);
CHECK_NE(num_methods, 0u) << oat_file_->GetLocation();
uint32_t num_method_offsets;
if (type == OatClassType::kSomeCompiled) {
uint32_t bitmap_size = BitVector::BitsToWords(num_methods) * BitVector::kWordBytes;
CHECK_LE(bitmap_size, static_cast<size_t>(oat_file_->End() - current_pointer))
<< oat_file_->GetLocation();
bitmap_pointer = reinterpret_cast<const uint32_t*>(current_pointer);
current_pointer += bitmap_size;
// Note: The bits in range [num_methods, bitmap_size * kBitsPerByte)
// should be zero but we're not verifying that.
num_method_offsets = BitVector::NumSetBits(bitmap_pointer, num_methods);
} else {
num_method_offsets = num_methods;
}
CHECK_LE(num_method_offsets,
static_cast<size_t>(oat_file_->End() - current_pointer) / sizeof(OatMethodOffsets))
<< oat_file_->GetLocation();
methods_pointer = reinterpret_cast<const OatMethodOffsets*>(current_pointer);
}
return OatFile::OatClass(oat_file_, status, type, num_methods, bitmap_pointer, methods_pointer);
}
const dex::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 dex::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);
if (class_def_idx != dex::kDexNoIndex) {
CHECK_LT(class_def_idx, dex_file.NumClassDefs()) << oat_dex_file->GetOatFile()->GetLocation();
lookup_table_classdef = &dex_file.GetClassDef(class_def_idx);
}
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 dex::TypeId* type_id = dex_file.FindTypeId(descriptor);
if (type_id != nullptr) {
dex::TypeIndex type_idx = dex_file.GetIndexForTypeId(*type_id);
const dex::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();
if (sections != nullptr) {
sections->Madvise(&dex_file, state);
} else {
DCHECK(oat_dex_file->IsBackedByVdexOnly());
}
}
}
OatFile::OatClass::OatClass(const OatFile* oat_file,
ClassStatus status,
OatClassType type,
uint32_t num_methods,
const uint32_t* bitmap_pointer,
const OatMethodOffsets* methods_pointer)
: oat_file_(oat_file),
status_(status),
type_(type),
num_methods_(num_methods),
bitmap_(bitmap_pointer),
methods_pointer_(methods_pointer) {
DCHECK_EQ(num_methods != 0u, type != OatClassType::kNoneCompiled);
DCHECK_EQ(bitmap_pointer != nullptr, type == OatClassType::kSomeCompiled);
DCHECK_EQ(methods_pointer != nullptr, type != OatClassType::kNoneCompiled);
}
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 for `kNoneCompiled` and cannot do
// a bounds check for `method_index` in that case.
if (methods_pointer_ == nullptr) {
CHECK_EQ(OatClassType::kNoneCompiled, type_);
return nullptr;
}
CHECK_LT(method_index, num_methods_) << oat_file_->GetLocation();
size_t methods_pointer_index;
if (bitmap_ == nullptr) {
CHECK_EQ(OatClassType::kAllCompiled, type_);
methods_pointer_index = method_index;
} else {
CHECK_EQ(OatClassType::kSomeCompiled, 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;
}
if (kIsDebugBuild) {
size_t size_until_end = dchecked_integral_cast<size_t>(
oat_file_->End() - reinterpret_cast<const uint8_t*>(methods_pointer_));
CHECK_LE(methods_pointer_index, size_until_end / sizeof(OatMethodOffsets))
<< oat_file_->GetLocation();
}
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);
}
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);
}
bool OatFile::RequiresImage() const { return GetOatHeader().RequiresImage(); }
static void DCheckIndexToBssMapping(const 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);
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(prev_entry != nullptr);
CHECK_LT(prev_entry->GetIndex(index_bits), number_of_indexes);
}
}
void OatFile::InitializeRelocations() const {
DCHECK(IsExecutable());
// Initialize the .data.bimg.rel.ro section.
if (!GetBootImageRelocations().empty()) {
uint8_t* reloc_begin = const_cast<uint8_t*>(DataBimgRelRoBegin());
CheckedCall(mprotect,
"un-protect boot image relocations",
reloc_begin,
DataBimgRelRoSize(),
PROT_READ | PROT_WRITE);
uint32_t boot_image_begin = Runtime::Current()->GetHeap()->GetBootImagesStartAddress();
for (const uint32_t& relocation : GetBootImageRelocations()) {
const_cast<uint32_t&>(relocation) += boot_image_begin;
}
CheckedCall(mprotect,
"protect boot image relocations",
reloc_begin,
DataBimgRelRoSize(),
PROT_READ);
}
// Before initializing .bss, check the .bss mappings in debug mode.
if (kIsDebugBuild) {
PointerSize pointer_size = GetInstructionSetPointerSize(GetOatHeader().GetInstructionSet());
for (const OatDexFile* odf : GetOatDexFiles()) {
const DexFile::Header* header =
reinterpret_cast<const DexFile::Header*>(odf->GetDexFilePointer());
DCheckIndexToBssMapping(this,
header->method_ids_size_,
static_cast<size_t>(pointer_size),
odf->GetMethodBssMapping());
DCheckIndexToBssMapping(this,
header->type_ids_size_,
sizeof(GcRoot<mirror::Class>),
odf->GetTypeBssMapping());
DCheckIndexToBssMapping(this,
header->string_ids_size_,
sizeof(GcRoot<mirror::String>),
odf->GetStringBssMapping());
}
}
// Initialize the .bss section.
// TODO: Pre-initialize from boot/app image?
ArtMethod* resolution_method = Runtime::Current()->GetResolutionMethod();
for (ArtMethod*& entry : GetBssMethods()) {
entry = resolution_method;
}
}
void OatDexFile::AssertAotCompiler() {
CHECK(Runtime::Current()->IsAotCompiler());
}
bool OatFile::IsBackedByVdexOnly() const {
return oat_dex_files_storage_.size() >= 1 && oat_dex_files_storage_[0]->IsBackedByVdexOnly();
}
} // namespace art
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