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/*
* Copyright (C) 2018 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 <stdint.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <memory>
#define LOG_TAG "unwind"
#include <log/log.h>
#include <android-base/unique_fd.h>
#include <art_api/dex_file_support.h>
#include <unwindstack/MapInfo.h>
#include <unwindstack/Memory.h>
#include "DexFile.h"
namespace unwindstack {
static bool CheckDexSupport() {
if (std::string err_msg; !art_api::dex::TryLoadLibdexfileExternal(&err_msg)) {
ALOGW("Failed to initialize DEX file support: %s", err_msg.c_str());
return false;
}
return true;
}
static bool HasDexSupport() {
static bool has_dex_support = CheckDexSupport();
return has_dex_support;
}
std::unique_ptr<DexFile> DexFile::Create(uint64_t dex_file_offset_in_memory, Memory* memory,
MapInfo* info) {
if (UNLIKELY(!HasDexSupport())) {
return nullptr;
}
size_t max_size = info->end - dex_file_offset_in_memory;
if (memory->IsLocal()) {
size_t size = max_size;
std::string err_msg;
std::unique_ptr<art_api::dex::DexFile> art_dex_file = DexFile::OpenFromMemory(
reinterpret_cast<void const*>(dex_file_offset_in_memory), &size, info->name, &err_msg);
if (art_dex_file != nullptr && size <= max_size) {
return std::unique_ptr<DexFile>(new DexFile(art_dex_file));
}
}
if (!info->name.empty()) {
std::unique_ptr<DexFile> dex_file =
DexFileFromFile::Create(dex_file_offset_in_memory - info->start + info->offset, info->name);
if (dex_file) {
return dex_file;
}
}
return DexFileFromMemory::Create(dex_file_offset_in_memory, memory, info->name, max_size);
}
bool DexFile::GetMethodInformation(uint64_t dex_offset, std::string* method_name,
uint64_t* method_offset) {
art_api::dex::MethodInfo method_info = GetMethodInfoForOffset(dex_offset, false);
if (method_info.offset == 0) {
return false;
}
*method_name = method_info.name;
*method_offset = dex_offset - method_info.offset;
return true;
}
std::unique_ptr<DexFileFromFile> DexFileFromFile::Create(uint64_t dex_file_offset_in_file,
const std::string& file) {
if (UNLIKELY(!HasDexSupport())) {
return nullptr;
}
android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(file.c_str(), O_RDONLY | O_CLOEXEC)));
if (fd == -1) {
return nullptr;
}
std::string error_msg;
std::unique_ptr<art_api::dex::DexFile> art_dex_file =
OpenFromFd(fd, dex_file_offset_in_file, file, &error_msg);
if (art_dex_file == nullptr) {
return nullptr;
}
return std::unique_ptr<DexFileFromFile>(new DexFileFromFile(art_dex_file));
}
std::unique_ptr<DexFileFromMemory> DexFileFromMemory::Create(uint64_t dex_file_offset_in_memory,
Memory* memory,
const std::string& name,
size_t max_size) {
if (UNLIKELY(!HasDexSupport())) {
return nullptr;
}
std::vector<uint8_t> backing_memory;
for (size_t size = 0;;) {
std::string error_msg;
std::unique_ptr<art_api::dex::DexFile> art_dex_file =
OpenFromMemory(backing_memory.data(), &size, name, &error_msg);
if (size > max_size) {
return nullptr;
}
if (art_dex_file != nullptr) {
return std::unique_ptr<DexFileFromMemory>(
new DexFileFromMemory(art_dex_file, std::move(backing_memory)));
}
if (!error_msg.empty()) {
return nullptr;
}
backing_memory.resize(size);
if (!memory->ReadFully(dex_file_offset_in_memory, backing_memory.data(),
backing_memory.size())) {
return nullptr;
}
}
}
} // namespace unwindstack
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