/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "read_dex_file.h"
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#include <fcntl.h>
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#include <algorithm>
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#include <iterator>
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#include <string>
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#include <utility>
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#include <vector>
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#include <android-base/logging.h>
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#include <android-base/unique_fd.h>
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#include <art_api/dex_file_support.h>
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static bool ReadSymbols(
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const std::vector<uint64_t>& dex_file_offsets, std::vector<DexFileSymbol>* symbols,
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const std::function<std::unique_ptr<art_api::dex::DexFile>(uint64_t offset)>& open_file_cb) {
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for (uint64_t offset : dex_file_offsets) {
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std::unique_ptr<art_api::dex::DexFile> dex_file = open_file_cb(offset);
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if (dex_file == nullptr) {
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return false;
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}
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std::vector<art_api::dex::MethodInfo> file_syms = dex_file->GetAllMethodInfos(false);
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// Adjust offsets to be from the start of the combined file.
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for (art_api::dex::MethodInfo& sym : file_syms) {
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sym.offset += offset;
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}
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if (symbols->empty()) {
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*symbols = std::move(file_syms);
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} else {
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symbols->reserve(symbols->size() + file_syms.size());
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std::move(std::begin(file_syms), std::end(file_syms), std::back_inserter(*symbols));
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}
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}
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return true;
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}
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bool ReadSymbolsFromDexFileInMemory(void* addr, uint64_t size,
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const std::vector<uint64_t>& dex_file_offsets,
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std::vector<DexFileSymbol>* symbols) {
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return ReadSymbols(
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dex_file_offsets, symbols, [&](uint64_t offset) -> std::unique_ptr<art_api::dex::DexFile> {
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size_t max_file_size;
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if (__builtin_sub_overflow(size, offset, &max_file_size)) {
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return nullptr;
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}
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uint8_t* file_addr = static_cast<uint8_t*>(addr) + offset;
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std::string error_msg;
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std::unique_ptr<art_api::dex::DexFile> dex_file =
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art_api::dex::DexFile::OpenFromMemory(file_addr, &max_file_size, "", &error_msg);
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if (dex_file == nullptr) {
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LOG(WARNING) << "Failed to read dex file symbols: " << error_msg;
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return nullptr;
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}
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return dex_file;
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});
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}
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bool ReadSymbolsFromDexFile(const std::string& file_path,
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const std::vector<uint64_t>& dex_file_offsets,
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std::vector<DexFileSymbol>* symbols) {
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android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(file_path.c_str(), O_RDONLY | O_CLOEXEC)));
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if (fd == -1) {
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return false;
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}
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return ReadSymbols(
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dex_file_offsets, symbols, [&](uint64_t offset) -> std::unique_ptr<art_api::dex::DexFile> {
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std::string error_msg;
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std::unique_ptr<art_api::dex::DexFile> dex_file =
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art_api::dex::DexFile::OpenFromFd(fd, offset, file_path, &error_msg);
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if (dex_file == nullptr) {
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LOG(WARNING) << "Failed to read dex file symbols from '" << file_path
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<< "': " << error_msg;
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return nullptr;
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}
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return dex_file;
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});
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}
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