/*
  functioncalltimer.cpp

  This file is part of GammaRay, the Qt application inspection and
  manipulation tool.

  Copyright (C) 2010-2016 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
  Author: Thomas McGuire <thomas.mcguire@kdab.com>

  Licensees holding valid commercial KDAB GammaRay licenses may use this file in
  accordance with GammaRay Commercial License Agreement provided with the Software.

  Contact info@kdab.com if any conditions of this licensing are not clear to you.

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
#include "functioncalltimer.h"

#ifdef Q_OS_WIN
#include <qt_windows.h>
#endif

#if defined(Q_OS_MAC) && defined(__MACH__)
#include <mach/clock.h>
#include <mach/mach.h>
#endif

using namespace GammaRay;

#ifndef Q_OS_WIN
static void portableGetTimeUnix(timespec &t)
{
#if defined(Q_OS_MAC)
    clock_serv_t cclock;
    mach_timespec_t mts;
    host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &cclock);
    clock_get_time(cclock, &mts);
    mach_port_deallocate(mach_task_self(), cclock);
    t.tv_sec = mts.tv_sec;
    t.tv_nsec = mts.tv_nsec;
#else
    clock_gettime(CLOCK_REALTIME, &t);
#endif
}

#endif

FunctionCallTimer::FunctionCallTimer()
    : m_startTime()
    , m_active(false)
{
}

bool FunctionCallTimer::start()
{
    if (m_active)
        return false;

#if defined(Q_OS_WIN)
    LARGE_INTEGER startTime;
    bool ret = QueryPerformanceCounter(&startTime);
    if (!ret)
        return false;
    m_startTime = startTime.QuadPart;
#else
    portableGetTimeUnix(m_startTime);
#endif
    m_active = true;
    return true;
}

bool FunctionCallTimer::active() const
{
    return m_active;
}

int FunctionCallTimer::stop()
{
    Q_ASSERT(m_active);
    m_active = false;

#if defined(Q_OS_WIN)
    LARGE_INTEGER endTime;
    LARGE_INTEGER frequency;
    QueryPerformanceCounter(&endTime);
    QueryPerformanceFrequency(&frequency);
    int elapsed = ((endTime.QuadPart - m_startTime) * 1000000) / frequency.QuadPart;
#else
    timespec endTime;
    portableGetTimeUnix(endTime);
    int elapsed = (endTime.tv_nsec - m_startTime.tv_nsec) / 1000;
    elapsed += (endTime.tv_sec - m_startTime.tv_sec) * 1000000;
#endif
    return elapsed;
}
