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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/scenarios/loading_scenario_data.h"
#include <map>
#include <vector>
#include "base/check_op.h"
#include "base/containers/contains.h"
#include "base/numerics/checked_math.h"
#include "components/performance_manager/public/graph/process_node.h"
namespace performance_manager {
namespace {
// Increments `num` in-place, and CHECK's on overflow.
void CheckIncrement(size_t& num) {
num = base::CheckAdd(num, 1).ValueOrDie();
}
// Decrements `num` in-place, and CHECK's on underflow.
void CheckDecrement(size_t& num) {
num = base::CheckSub(num, 1).ValueOrDie();
}
} // namespace
void LoadingScenarioCounts::IncrementLoadingPageCounts(bool visible,
bool focused) {
CheckIncrement(loading_pages_);
if (visible) {
CheckIncrement(visible_loading_pages_);
}
if (focused) {
CheckIncrement(focused_loading_pages_);
}
}
void LoadingScenarioCounts::DecrementLoadingPageCounts(bool visible,
bool focused) {
CheckDecrement(loading_pages_);
if (visible) {
CheckDecrement(visible_loading_pages_);
}
if (focused) {
CheckDecrement(focused_loading_pages_);
}
}
LoadingScenarioPageFrameCounts::LoadingScenarioPageFrameCounts() = default;
LoadingScenarioPageFrameCounts::~LoadingScenarioPageFrameCounts() = default;
LoadingScenarioPageFrameCounts::LoadingScenarioPageFrameCounts(
LoadingScenarioPageFrameCounts&&) = default;
LoadingScenarioPageFrameCounts& LoadingScenarioPageFrameCounts::operator=(
LoadingScenarioPageFrameCounts&&) = default;
size_t LoadingScenarioPageFrameCounts::IncrementFrameCountForProcess(
const ProcessNode* process_node) {
auto [it, _] = process_frame_counts_.try_emplace(process_node, 0u);
CheckIncrement(it->second);
return it->second;
}
size_t LoadingScenarioPageFrameCounts::DecrementFrameCountForProcess(
const ProcessNode* process_node) {
auto it = process_frame_counts_.find(process_node);
CHECK(it != process_frame_counts_.end());
CheckDecrement(it->second);
if (it->second == 0) {
process_frame_counts_.erase(it);
return 0;
}
return it->second;
}
bool LoadingScenarioPageFrameCounts::ProcessHasFramesInPage(
const ProcessNode* process_node) const {
return base::Contains(process_frame_counts_, process_node);
}
std::vector<const ProcessNode*>
LoadingScenarioPageFrameCounts::GetProcessesWithFramesInPage() const {
std::vector<const ProcessNode*> process_nodes;
process_nodes.reserve(process_frame_counts_.size());
for (const auto& [process_node, frame_count] : process_frame_counts_) {
CHECK_GT(frame_count, 0u);
process_nodes.push_back(process_node);
}
return process_nodes;
}
} // namespace performance_manager
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