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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/performance_manager/scenario_api/performance_scenarios.h"
#include <atomic>
#include <utility>
#include "base/containers/enum_set.h"
#include "base/memory/scoped_refptr.h"
#include "components/performance_manager/scenario_api/performance_scenario_memory.h"
namespace performance_scenarios {
namespace {
// Returns the scenario state from `mapping`, or a default empty state if
// `mapping` is null (which can happen if no ScopedReadOnlyScenarioMemory exists
// or if the mapping failed). Takes a raw pointer instead of a scoped_ptr to
// avoid refcount churn.
const ScenarioState& GetScenarioStateFromMapping(
const RefCountedScenarioMapping* mapping) {
static constinit ScenarioState kDummyScenarioState;
return mapping ? mapping->data.ReadOnlyRef() : kDummyScenarioState;
}
} // namespace
SharedAtomicRef<LoadingScenario> GetLoadingScenario(ScenarioScope scope) {
scoped_refptr<RefCountedScenarioMapping> mapping =
GetScenarioMappingForScope(scope);
const std::atomic<LoadingScenario>& scenario =
GetScenarioStateFromMapping(mapping.get()).loading;
return SharedAtomicRef<LoadingScenario>(std::move(mapping), scenario);
}
SharedAtomicRef<InputScenario> GetInputScenario(ScenarioScope scope) {
scoped_refptr<RefCountedScenarioMapping> mapping =
GetScenarioMappingForScope(scope);
const std::atomic<InputScenario>& scenario =
GetScenarioStateFromMapping(mapping.get()).input;
return SharedAtomicRef<InputScenario>(std::move(mapping), scenario);
}
bool CurrentScenariosMatch(ScenarioScope scope, ScenarioPattern pattern) {
return ScenariosMatch(
GetLoadingScenario(scope)->load(std::memory_order_relaxed),
GetInputScenario(scope)->load(std::memory_order_relaxed), pattern);
}
bool ScenariosMatch(LoadingScenario loading_scenario,
InputScenario input_scenario,
ScenarioPattern pattern) {
bool loading_matches =
pattern.loading.empty() || pattern.loading.Has(loading_scenario);
bool input_matches =
pattern.input.empty() || pattern.input.Has(input_scenario);
return loading_matches && input_matches;
}
} // namespace performance_scenarios
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