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