/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef GECKO_TASK_TRACER_IMPL_H
#define GECKO_TASK_TRACER_IMPL_H

#include "GeckoTaskTracer.h"

#include "mozilla/Mutex.h"
#include "nsTArray.h"

namespace mozilla {
namespace tasktracer {

struct LogRecDispatch {
  uint32_t mType;
  uint32_t mSourceEventType;
  uint64_t mTaskId;
  uint64_t mTime;
  uint64_t mSourceEventId;
  uint64_t mParentTaskId;
};

struct LogRecBegin {
  uint32_t mType;
  uint64_t mTaskId;
  uint64_t mTime;
  uint32_t mPid;
  uint32_t mTid;
};

struct LogRecEnd {
  uint32_t mType;
  uint64_t mTaskId;
  uint64_t mTime;
};

struct LogRecVPtr {
  uint32_t mType;
  uint64_t mTaskId;
  uintptr_t mVPtr;
};

struct LogRecLabel {
  uint32_t mType;
  uint32_t mStrIdx;
  uint64_t mTaskId;
  uint64_t mTime;
};

union TraceInfoLogType {
  uint32_t mType;
  LogRecDispatch mDispatch;
  LogRecBegin mBegin;
  LogRecEnd mEnd;
  LogRecVPtr mVPtr;
  LogRecLabel mLabel;
};

struct TraceInfoLogNode {
  TraceInfoLogType mLog;
  TraceInfoLogNode* mNext;
};

struct TraceInfo {
  explicit TraceInfo(uint32_t aThreadId)
      : mCurTraceSourceId(0),
        mCurTaskId(0),
        mCurTraceSourceType(Unknown),
        mThreadId(aThreadId),
        mLastUniqueTaskId(0),
        mObsolete(false),
        mLogsMutex("TraceInfoMutex"),
        mLogsHead(nullptr),
        mLogsTail(nullptr),
        mLogsSize(0) {
    MOZ_COUNT_CTOR(TraceInfo);
  }

  ~TraceInfo() {
    MOZ_COUNT_DTOR(TraceInfo);
    while (mLogsHead) {
      auto node = mLogsHead;
      mLogsHead = node->mNext;
      delete node;
    }
  }

  TraceInfoLogType* AppendLog();

  uint64_t mCurTraceSourceId;
  uint64_t mCurTaskId;
  SourceEventType mCurTraceSourceType;
  uint32_t mThreadId;
  uint32_t mLastUniqueTaskId;
  mozilla::Atomic<bool> mObsolete;

  // This mutex protects the following log
  mozilla::Mutex mLogsMutex;
  TraceInfoLogNode* mLogsHead;
  TraceInfoLogNode* mLogsTail;
  int mLogsSize;
  nsTArray<nsCString> mStrs;
};

class TraceInfoHolder {
 public:
  TraceInfoHolder() : mInfo(nullptr) {}
  explicit TraceInfoHolder(TraceInfo* aInfo) : mInfo(aInfo) {
    aInfo->mLogsMutex.AssertNotCurrentThreadOwns();  // in case of recursive
    aInfo->mLogsMutex.Lock();
    MOZ_ASSERT(aInfo);
  }
  TraceInfoHolder(const TraceInfoHolder& aOther) = delete;
  TraceInfoHolder(TraceInfoHolder&& aOther) : mInfo(aOther.mInfo) {
    if (!!aOther) {
      aOther->mLogsMutex.AssertCurrentThreadOwns();
    }
    aOther.mInfo = nullptr;
  }
  ~TraceInfoHolder() {
    if (mInfo) mInfo->mLogsMutex.Unlock();
  }
  explicit operator bool() const { return !!mInfo; }
  TraceInfo* operator->() { return mInfo; }
  bool operator==(TraceInfo* aOther) const { return mInfo == aOther; }
  bool operator==(const TraceInfoHolder& aOther) const {
    return mInfo == aOther.mInfo;
  }
  void Reset() {
    if (mInfo) {
      mInfo->mLogsMutex.Unlock();
      mInfo = nullptr;
    }
  }

 private:
  TraceInfo* mInfo;
};

// Return the TraceInfo of current thread, allocate a new one if not exit.
TraceInfoHolder GetOrCreateTraceInfo();

uint64_t GenNewUniqueTaskId();

void SetCurTraceInfo(uint64_t aSourceEventId, uint64_t aParentTaskId,
                     SourceEventType aSourceEventType);

/**
 * Logging functions of different trace actions.
 */
enum ActionType {
  ACTION_DISPATCH = 0,
  ACTION_BEGIN,
  ACTION_END,
  ACTION_ADD_LABEL,
  ACTION_GET_VTABLE
};

void LogDispatch(uint64_t aTaskId, uint64_t aParentTaskId,
                 uint64_t aSourceEventId, SourceEventType aSourceEventType);

void LogDispatch(uint64_t aTaskId, uint64_t aParentTaskId,
                 uint64_t aSourceEventId, SourceEventType aSourceEventType,
                 int aDelayTimeMs);

void LogBegin(uint64_t aTaskId, uint64_t aSourceEventId);

void LogEnd(uint64_t aTaskId, uint64_t aSourceEventId);

void LogVirtualTablePtr(uint64_t aTaskId, uint64_t aSourceEventId,
                        uintptr_t* aVptr);

}  // namespace tasktracer
}  // namespace mozilla

#endif