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/*
* Copyright (C) 2021 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 "flags.h"
#include <algorithm>
#include "android-base/parsebool.h"
#include "android-base/parseint.h"
#include "android-base/properties.h"
#include "base/utils.h"
#pragma clang diagnostic push
#pragma clang diagnostic error "-Wconversion"
namespace {
constexpr const char* kPhenotypeFlagPrefix = "persist.device_config.runtime_native.";
constexpr const char* kSysPropertyFlagPrefix = "dalvik.vm.";
constexpr const char* kUndefinedValue = "";
// The various ParseValue functions store the parsed value into *destination. If parsing fails for
// some reason, ParseValue makes no changes to *destination.
bool ParseValue(const std::string_view value, std::optional<bool>* destination) {
switch (::android::base::ParseBool(value)) {
case ::android::base::ParseBoolResult::kError:
return false;
case ::android::base::ParseBoolResult::kTrue:
*destination = true;
return true;
case ::android::base::ParseBoolResult::kFalse:
*destination = false;
return true;
}
}
bool ParseValue(const std::string_view value, std::optional<int32_t>* destination) {
int32_t parsed_value = 0;
if (::android::base::ParseInt(std::string{value}, &parsed_value)) {
*destination = parsed_value;
return true;
}
return false;
}
bool ParseValue(const std::string_view value,
std::optional<uint32_t>* destination) {
uint32_t parsed_value = 0;
if (::android::base::ParseUint(std::string{value}, &parsed_value)) {
*destination = parsed_value;
return true;
}
return false;
}
bool ParseValue(const std::string_view value, std::optional<std::string>* destination) {
*destination = value;
return true;
}
} // namespace
namespace art {
template <>
std::forward_list<FlagBase*> FlagBase::ALL_FLAGS{};
// gFlags must be defined after FlagBase::ALL_FLAGS so the constructors run in the right order.
Flags gFlags;
static std::string GenerateCmdLineArgName(const std::string& name) {
std::string result = "-X" + name + ":_";
std::replace(result.begin(), result.end(), '.', '-');
return result;
}
static std::string GenerateSysPropName(const std::string& name) {
return kSysPropertyFlagPrefix + name;
}
static std::string GeneratePhenotypeName(const std::string& name) {
return kPhenotypeFlagPrefix + name;
}
template <typename Value>
Flag<Value>::Flag(const std::string& name, Value default_value, FlagType type) :
FlagBase(GenerateCmdLineArgName(name),
GenerateSysPropName(name),
GeneratePhenotypeName(name),
type),
initialized_{false},
default_{default_value} {
ALL_FLAGS.push_front(this);
}
template <typename Value>
Flag<Value>::~Flag() {
ALL_FLAGS.remove(this);
}
template <typename Value>
void Flag<Value>::Reload() {
initialized_ = true;
// The cmdline flags are loaded by the parsed_options infra. No action needed here.
if (type_ == FlagType::kCmdlineOnly) {
return;
}
// Load system properties.
from_system_property_ = std::nullopt;
const std::string sysprop = ::android::base::GetProperty(system_property_name_, kUndefinedValue);
if (sysprop != kUndefinedValue) {
if (!ParseValue(sysprop, &from_system_property_)) {
LOG(ERROR) << "Failed to parse " << system_property_name_ << "=" << sysprop;
}
}
// Load the server-side configuration.
from_server_setting_ = std::nullopt;
const std::string server_config =
::android::base::GetProperty(server_setting_name_, kUndefinedValue);
if (server_config != kUndefinedValue) {
if (!ParseValue(server_config, &from_server_setting_)) {
LOG(ERROR) << "Failed to parse " << server_setting_name_ << "=" << server_config;
}
}
}
template <typename Value>
void DumpValue(std::ostream& oss, const std::optional<Value>& val) {
if (val.has_value()) {
oss << val.value();
} else {
oss << kUndefinedValue;
}
}
template <typename Value>
void Flag<Value>::Dump(std::ostream& oss) const {
std::pair<Value, FlagOrigin> valueOrigin = GetValueAndOrigin();
std::string origin;
switch (std::get<1>(valueOrigin)) {
case FlagOrigin::kDefaultValue: origin = "default_value"; break;
case FlagOrigin::kCmdlineArg: origin = "cmdline_arg"; break;
case FlagOrigin::kSystemProperty: origin = "system_property"; break;
case FlagOrigin::kServerSetting: origin = "server_setting"; break;
}
oss << "value: " << std::get<0>(valueOrigin) << " (from " << origin << ")";
oss << "\n default: " << default_;
oss << "\n " << command_line_argument_name_ << ": ";
DumpValue(oss, from_command_line_);
oss << "\n " << system_property_name_ << ": ";
DumpValue(oss, from_system_property_);
oss << "\n " << server_setting_name_ << ": ";
DumpValue(oss, from_server_setting_);
}
template class Flag<bool>;
template class Flag<int>;
template class Flag<std::string>;
} // namespace art
#pragma clang diagnostic pop // -Wconversion
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