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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_ALLOCATOR_MIRACLE_PARAMETER_H_
#define BASE_ALLOCATOR_MIRACLE_PARAMETER_H_
#include "base/base_export.h"
#include "base/containers/span.h"
#include "base/feature_list.h"
#include "base/metrics/field_trial_params.h"
// This is a mirror copy of the //components/miracle_parameter/ to resolve the
// dependency cycle of (base->miracle_parameter->base).
// Eventually the miracle_parameter component will have a public interface in
// //base/ and this could be removed.
// TODO(crbug.com/40279826): remove miracle_parameter from
// //base/allocator/.
namespace base {
namespace miracle_parameter {
namespace {
template <typename Enum>
Enum GetFieldTrialParamByFeatureAsEnum(
const base::Feature& feature,
const std::string& param_name,
const Enum default_value,
const base::span<const typename base::FeatureParam<Enum>::Option>&
options) {
std::string string_value =
base::GetFieldTrialParamValueByFeature(feature, param_name);
if (string_value.empty()) {
return default_value;
}
for (const auto& option : options) {
if (string_value == option.name) {
return option.value;
}
}
base::LogInvalidEnumValue(feature, param_name, string_value,
static_cast<int>(default_value));
return default_value;
}
} // namespace
constexpr int kMiracleParameterMemory512MB = 512;
constexpr int kMiracleParameterMemory1GB = 1024;
constexpr int kMiracleParameterMemory2GB = 2 * 1024;
constexpr int kMiracleParameterMemory4GB = 4 * 1024;
constexpr int kMiracleParameterMemory8GB = 8 * 1024;
constexpr int kMiracleParameterMemory16GB = 16 * 1024;
// GetParamNameWithSuffix put a parameter name suffix based on
// the amount of physical memory.
//
// - "ForLessThan512MB" for less than 512MB memory devices.
// - "For512MBTo1GB" for 512MB to 1GB memory devices.
// - "For1GBTo2GB" for 1GB to 2GB memory devices.
// - "For2GBTo4GB" for 2GB to 4GB memory devices.
// - "For4GBTo8GB" for 4GB to 8GB memory devices.
// - "For8GBTo16GB" for 8GB to 16GB memory devices.
// - "For16GBAndAbove" for 16GB memory and above devices.
BASE_EXPORT
std::string GetParamNameWithSuffix(const std::string& param_name);
// Provides a similar behavior with FeatureParam<std::string> except the return
// value is determined by the amount of physical memory.
BASE_EXPORT
std::string GetMiracleParameterAsString(const base::Feature& feature,
const std::string& param_name,
const std::string& default_value);
// Provides a similar behavior with FeatureParam<double> except the return value
// is determined by the amount of physical memory.
BASE_EXPORT
double GetMiracleParameterAsDouble(const base::Feature& feature,
const std::string& param_name,
double default_value);
// Provides a similar behavior with FeatureParam<int> except the return value is
// determined by the amount of physical memory.
BASE_EXPORT
int GetMiracleParameterAsInt(const base::Feature& feature,
const std::string& param_name,
int default_value);
// Provides a similar behavior with FeatureParam<bool> except the return value
// is determined by the amount of physical memory.
BASE_EXPORT
bool GetMiracleParameterAsBool(const base::Feature& feature,
const std::string& param_name,
bool default_value);
// Provides a similar behavior with FeatureParam<base::TimeDelta> except the
// return value is determined by the amount of physical memory.
BASE_EXPORT
base::TimeDelta GetMiracleParameterAsTimeDelta(const base::Feature& feature,
const std::string& param_name,
base::TimeDelta default_value);
// Provides a similar behavior with FeatureParam<Enum> except the return value
// is determined by the amount of physical memory.
template <typename Enum>
Enum GetMiracleParameterAsEnum(
const base::Feature& feature,
const std::string& param_name,
const Enum default_value,
const base::span<const typename base::FeatureParam<Enum>::Option> options) {
return GetFieldTrialParamByFeatureAsEnum(
feature, GetParamNameWithSuffix(param_name),
GetFieldTrialParamByFeatureAsEnum(feature, param_name, default_value,
options),
options);
}
#define MIRACLE_PARAMETER_FOR_STRING(function_name, feature, param_name, \
default_value) \
std::string function_name() { \
static const std::string value = \
miracle_parameter::GetMiracleParameterAsString(feature, param_name, \
default_value); \
return value; \
}
#define MIRACLE_PARAMETER_FOR_DOUBLE(function_name, feature, param_name, \
default_value) \
double function_name() { \
static const double value = \
miracle_parameter::GetMiracleParameterAsDouble(feature, param_name, \
default_value); \
return value; \
}
#define MIRACLE_PARAMETER_FOR_INT(function_name, feature, param_name, \
default_value) \
int function_name() { \
static const int value = miracle_parameter::GetMiracleParameterAsInt( \
feature, param_name, default_value); \
return value; \
}
#define MIRACLE_PARAMETER_FOR_BOOL(function_name, feature, param_name, \
default_value) \
bool function_name() { \
static const bool value = miracle_parameter::GetMiracleParameterAsBool( \
feature, param_name, default_value); \
return value; \
}
#define MIRACLE_PARAMETER_FOR_TIME_DELTA(function_name, feature, param_name, \
default_value) \
base::TimeDelta function_name() { \
static const base::TimeDelta value = \
miracle_parameter::GetMiracleParameterAsTimeDelta(feature, param_name, \
default_value); \
return value; \
}
#define MIRACLE_PARAMETER_FOR_ENUM(function_name, feature, param_name, \
default_value, type, options) \
type function_name() { \
static const type value = miracle_parameter::GetMiracleParameterAsEnum( \
feature, param_name, default_value, base::span(options)); \
return value; \
}
} // namespace miracle_parameter
} // namespace base
#endif // BASE_ALLOCATOR_MIRACLE_PARAMETER_H_
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