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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 "read_dex_file.h"
#include <fcntl.h>
#include <algorithm>
#include <functional>
#include <iterator>
#include <string>
#include <utility>
#include <vector>
#include <android-base/logging.h>
#include <android-base/mapped_file.h>
#include <android-base/unique_fd.h>
#include <art_api/dex_file_support.h>
#include "utils.h"
namespace simpleperf {
static void ReadSymbols(art_api::dex::DexFile& dex_file, uint64_t file_offset,
const std::function<void(DexFileSymbol*)>& symbol_cb) {
auto callback = [&](const art_api::dex::DexFile::Method& method) {
size_t name_size, code_size;
const char* name = method.GetQualifiedName(/*with_params=*/false, &name_size);
size_t offset = method.GetCodeOffset(&code_size);
DexFileSymbol symbol{std::string_view(name, name_size), file_offset + offset, code_size};
symbol_cb(&symbol);
};
dex_file.ForEachMethod(callback);
}
bool ReadSymbolsFromDexFileInMemory(void* addr, uint64_t size, const std::string& debug_filename,
const std::vector<uint64_t>& dex_file_offsets,
const std::function<void(DexFileSymbol*)>& symbol_callback) {
for (uint64_t file_offset : dex_file_offsets) {
size_t max_file_size;
if (__builtin_sub_overflow(size, file_offset, &max_file_size)) {
LOG(WARNING) << "failed to read dex file symbols from " << debug_filename << "(offset "
<< file_offset << ")";
return false;
}
uint8_t* file_addr = static_cast<uint8_t*>(addr) + file_offset;
std::unique_ptr<art_api::dex::DexFile> dex_file;
art_api::dex::DexFile::Error error_msg =
art_api::dex::DexFile::Create(file_addr, max_file_size, nullptr, "", &dex_file);
if (dex_file == nullptr) {
LOG(WARNING) << "failed to read dex file symbols from " << debug_filename << "(offset "
<< file_offset << "): " << error_msg.ToString();
return false;
}
ReadSymbols(*dex_file, file_offset, symbol_callback);
}
return true;
}
bool ReadSymbolsFromDexFile(const std::string& file_path,
const std::vector<uint64_t>& dex_file_offsets,
const std::function<void(DexFileSymbol*)>& symbol_callback) {
android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(file_path.c_str(), O_RDONLY | O_CLOEXEC)));
if (fd == -1) {
return false;
}
size_t file_size = GetFileSize(file_path);
if (file_size == 0) {
return false;
}
std::unique_ptr<android::base::MappedFile> map;
map = android::base::MappedFile::FromFd(fd, 0, file_size, PROT_READ);
if (map == nullptr) {
return false;
}
return ReadSymbolsFromDexFileInMemory(map->data(), file_size, file_path, dex_file_offsets,
symbol_callback);
}
} // namespace simpleperf
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