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126 lines
3.9 KiB
126 lines
3.9 KiB
/*
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* Copyright (C) 2019 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 "profile_boot_info.h"
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#include <unistd.h>
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#include <vector>
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#include "dex/dex_file.h"
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#include "profile_helpers.h"
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namespace art {
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void ProfileBootInfo::Add(const DexFile* dex_file, uint32_t method_index) {
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auto it = std::find(dex_files_.begin(), dex_files_.end(), dex_file);
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uint32_t index = 0;
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if (it == dex_files_.end()) {
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index = dex_files_.size();
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dex_files_.push_back(dex_file);
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} else {
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index = std::distance(dex_files_.begin(), it);
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}
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methods_.push_back(std::make_pair(index, method_index));
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}
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bool ProfileBootInfo::Save(int fd) const {
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std::vector<uint8_t> buffer;
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// Store dex file locations.
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for (const DexFile* dex_file : dex_files_) {
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AddUintToBuffer(&buffer, static_cast<uint8_t>(dex_file->GetLocation().size()));
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AddStringToBuffer(&buffer, dex_file->GetLocation());
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}
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// Store marker between dex file locations and methods.
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AddUintToBuffer(&buffer, static_cast<uint8_t>(0));
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// Store pairs of <dex file index, method id>, in compilation order.
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for (const std::pair<uint32_t, uint32_t>& pair : methods_) {
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AddUintToBuffer(&buffer, pair.first);
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AddUintToBuffer(&buffer, pair.second);
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}
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if (!WriteBuffer(fd, buffer.data(), buffer.size())) {
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return false;
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}
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return true;
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}
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bool ProfileBootInfo::Load(int fd, const std::vector<const DexFile*>& dex_files) {
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// Read dex file locations.
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do {
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uint8_t string_length;
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int bytes_read = TEMP_FAILURE_RETRY(read(fd, &string_length, sizeof(uint8_t)));
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if (bytes_read < 0) {
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PLOG(ERROR) << "Unexpected error reading profile";
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return false;
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} else if (bytes_read == 0) {
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if (dex_files.empty()) {
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// If no dex files have been passed, that's expected.
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return true;
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} else {
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LOG(ERROR) << "Unexpected end of file for length";
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return false;
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}
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}
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if (string_length == 0) {
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break;
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}
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std::unique_ptr<char[]> data(new char[string_length]);
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bytes_read = TEMP_FAILURE_RETRY(read(fd, data.get(), string_length));
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if (bytes_read < 0) {
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PLOG(WARNING) << "Unexpected error reading profile";
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return false;
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} else if (bytes_read == 0) {
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LOG(ERROR) << "Unexpected end of file for name";
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return false;
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}
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// Map the location to an instance of dex file in `dex_files`.
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auto it = std::find_if(dex_files.begin(),
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dex_files.end(),
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[string_length, &data](const DexFile* file) {
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std::string dex_location = file->GetLocation();
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return dex_location.size() == string_length &&
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(strncmp(data.get(), dex_location.data(), string_length) == 0);
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});
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if (it != dex_files.end()) {
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dex_files_.push_back(*it);
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} else {
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LOG(ERROR) << "Couldn't find " << std::string(data.get(), string_length);
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return false;
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}
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} while (true);
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// Read methods.
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do {
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uint32_t dex_file_index;
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uint32_t method_id;
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int bytes_read = TEMP_FAILURE_RETRY(read(fd, &dex_file_index, sizeof(dex_file_index)));
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if (bytes_read <= 0) {
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break;
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}
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bytes_read = TEMP_FAILURE_RETRY(read(fd, &method_id, sizeof(method_id)));
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if (bytes_read <= 0) {
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LOG(ERROR) << "Didn't get a method id";
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return false;
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}
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methods_.push_back(std::make_pair(dex_file_index, method_id));
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} while (true);
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return true;
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}
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} // namespace art
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