/* Copyright (C) 2017 The Android Open Source Project
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This file implements interfaces from the file jvmti.h. This implementation
* is licensed under the same terms as the file jvmti.h. The
* copyright and license information for the file jvmti.h follows.
*
* Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include "fixed_up_dex_file.h"
#include "dex_file-inl.h"
// Runtime includes.
#include "dex_to_dex_decompiler.h"
#include "oat_file.h"
#include "vdex_file.h"
namespace openjdkjvmti {
static void RecomputeDexChecksum(art::DexFile* dex_file)
REQUIRES_SHARED(art::Locks::mutator_lock_) {
reinterpret_cast<art::DexFile::Header*>(const_cast<uint8_t*>(dex_file->Begin()))->checksum_ =
dex_file->CalculateChecksum();
}
// TODO This is more complicated then it seems like it should be.
// The fact we don't keep around the data of where in the flat binary log of dex-quickening changes
// each dex file starts means we need to search for it. Since JVMTI is the exception though we are
// not going to put in the effort to optimize for it.
static void DoDexUnquicken(const art::DexFile& new_dex_file,
const art::DexFile& original_dex_file)
REQUIRES_SHARED(art::Locks::mutator_lock_) {
const art::OatDexFile* oat_dex = original_dex_file.GetOatDexFile();
if (oat_dex == nullptr) {
return;
}
const art::OatFile* oat_file = oat_dex->GetOatFile();
if (oat_file == nullptr) {
return;
}
const art::VdexFile* vdex = oat_file->GetVdexFile();
if (vdex == nullptr || vdex->GetQuickeningInfo().size() == 0) {
return;
}
const art::ArrayRef<const uint8_t> quickening_info(vdex->GetQuickeningInfo());
const uint8_t* quickening_info_ptr = quickening_info.data();
for (const art::OatDexFile* cur_oat_dex : oat_file->GetOatDexFiles()) {
std::string error;
std::unique_ptr<const art::DexFile> cur_dex_file(cur_oat_dex->OpenDexFile(&error));
DCHECK(cur_dex_file.get() != nullptr);
// Is this the dex file we are looking for?
if (UNLIKELY(cur_dex_file->Begin() == original_dex_file.Begin())) {
// Simple sanity check.
CHECK_EQ(new_dex_file.NumClassDefs(), original_dex_file.NumClassDefs());
for (uint32_t i = 0; i < new_dex_file.NumClassDefs(); ++i) {
const art::DexFile::ClassDef& class_def = new_dex_file.GetClassDef(i);
const uint8_t* class_data = new_dex_file.GetClassData(class_def);
if (class_data == nullptr) {
continue;
}
for (art::ClassDataItemIterator it(new_dex_file, class_data); it.HasNext(); it.Next()) {
if (it.IsAtMethod() && it.GetMethodCodeItem() != nullptr) {
uint32_t quickening_size = *reinterpret_cast<const uint32_t*>(quickening_info_ptr);
quickening_info_ptr += sizeof(uint32_t);
art::optimizer::ArtDecompileDEX(
*it.GetMethodCodeItem(),
art::ArrayRef<const uint8_t>(quickening_info_ptr, quickening_size),
/*decompile_return_instruction*/true);
quickening_info_ptr += quickening_size;
}
}
}
// We don't need to bother looking through the rest of the dex-files.
break;
} else {
// Not the dex file we want. Skip over all the quickening info for all its classes.
for (uint32_t i = 0; i < cur_dex_file->NumClassDefs(); ++i) {
const art::DexFile::ClassDef& class_def = cur_dex_file->GetClassDef(i);
const uint8_t* class_data = cur_dex_file->GetClassData(class_def);
if (class_data == nullptr) {
continue;
}
for (art::ClassDataItemIterator it(*cur_dex_file, class_data); it.HasNext(); it.Next()) {
if (it.IsAtMethod() && it.GetMethodCodeItem() != nullptr) {
uint32_t quickening_size = *reinterpret_cast<const uint32_t*>(quickening_info_ptr);
quickening_info_ptr += sizeof(uint32_t);
quickening_info_ptr += quickening_size;
}
}
}
}
}
}
std::unique_ptr<FixedUpDexFile> FixedUpDexFile::Create(const art::DexFile& original) {
// Copy the data into mutable memory.
std::vector<unsigned char> data;
data.resize(original.Size());
memcpy(data.data(), original.Begin(), original.Size());
std::string error;
std::unique_ptr<const art::DexFile> new_dex_file(art::DexFile::Open(
data.data(),
data.size(),
/*location*/"Unquickening_dexfile.dex",
/*location_checksum*/0,
/*oat_dex_file*/nullptr,
/*verify*/false,
/*verify_checksum*/false,
&error));
if (new_dex_file.get() == nullptr) {
LOG(ERROR) << "Unable to open dex file from memory for unquickening! error: " << error;
return nullptr;
}
DoDexUnquicken(*new_dex_file, original);
RecomputeDexChecksum(const_cast<art::DexFile*>(new_dex_file.get()));
std::unique_ptr<FixedUpDexFile> ret(new FixedUpDexFile(std::move(new_dex_file), std::move(data)));
return ret;
}
} // namespace openjdkjvmti