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/*
* Copyright (C) 2020 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.
*/
#pragma once
#include <optional>
#include <string>
#include <vector>
namespace simpleperf {
class EventSelectionSet;
struct ProbeEvent {
std::string group_name;
std::string event_name;
};
// Add kprobe events in /sys/kernel/debug/tracing/kprobe_events, and
// delete them in ProbeEvents::clear().
class ProbeEvents {
public:
ProbeEvents(EventSelectionSet& event_selection_set) : event_selection_set_(event_selection_set) {}
~ProbeEvents();
static bool ParseKprobeEventName(const std::string& kprobe_cmd, ProbeEvent* event);
bool IsKprobeSupported();
// Accept kprobe cmd as in <linux_kernel>/Documentation/trace/kprobetrace.rst.
bool AddKprobe(const std::string& kprobe_cmd);
// If not exist, add a kprobe tracepoint at the function entry.
bool CreateProbeEventIfNotExist(const std::string& event_name);
private:
bool IsProbeEvent(const std::string& event_name);
bool IsEmpty() const { return kprobe_events_.empty(); }
void Clear();
bool WriteKprobeCmd(const std::string& kprobe_cmd);
EventSelectionSet& event_selection_set_;
std::vector<ProbeEvent> kprobe_events_;
std::optional<std::string> kprobe_control_path_;
};
} // namespace simpleperf
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