/*
 * Copyright The async-profiler authors
 * SPDX-License-Identifier: Apache-2.0
 */

#ifndef _PERFEVENTS_H
#define _PERFEVENTS_H

#include "arch.h"
#include "cpuEngine.h"

#ifdef __linux__

class PerfEvent;
class PerfEventType;
class StackContext;

class PerfEvents : public CpuEngine {
  private:
    static int _max_events;
    static PerfEvent* _events;
    static PerfEventType* _event_type;
    static Ring _ring;
    static bool _use_mmap_page;

    static u64 readCounter(siginfo_t* siginfo, void* ucontext);
    static void signalHandler(int signo, siginfo_t* siginfo, void* ucontext);
    static void signalHandlerJ9(int signo, siginfo_t* siginfo, void* ucontext);

    int createForThread(int tid);
    void destroyForThread(int tid);

  public:
    Error check(Arguments& args);
    Error start(Arguments& args);
    void stop();

    const char* title();
    const char* units();

    static int walk(int tid, void* ucontext, const void** callchain, int max_depth, StackContext* java_ctx);
    static void resetBuffer(int tid);

    static bool supported();
    static const char* getEventName(int event_id);
};

#else

class StackContext;

class PerfEvents : public CpuEngine {
  public:
    Error check(Arguments& args) {
        return Error("PerfEvents are not supported on this platform");
    }

    Error start(Arguments& args) {
        return Error("PerfEvents are not supported on this platform");
    }

    static int walk(int tid, void* ucontext, const void** callchain, int max_depth, StackContext* java_ctx) {
        return 0;
    }

    static void resetBuffer(int tid) {
    }

    static bool supported() {
        return false;
    }

    static const char* getEventName(int event_id) {
        return NULL;
    }
};

#endif // __linux__

#endif // _PERFEVENTS_H
