/* -*- C++ -*-
    This file declares debugging aids for multithreaded applications.

    SPDX-FileCopyrightText: 2004-2013 Mirko Boehm <mirko@kde.org>

    SPDX-License-Identifier: LGPL-2.0-or-later

    $Id: DebuggingAids.h 30 2005-08-16 16:16:04Z mirko $
*/

// krazy:excludeall=inline

#ifndef DEBUGGINGAIDS_H
#define DEBUGGINGAIDS_H

#include <QtGlobal>

extern "C" {
#include <stdarg.h>
#ifndef Q_OS_WIN
#include <unistd.h>
#endif
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
}

#include "threadweaver_export.h"
#include <QMutex>
#include <QString>

namespace ThreadWeaver
{
extern THREADWEAVER_EXPORT bool Debug;
extern THREADWEAVER_EXPORT int DebugLevel;
extern THREADWEAVER_EXPORT QMutex GlobalMutex;

/*! Set the debug log level.
 * \sa debug
 */
extern inline void setDebugLevel(bool TWDEBUG, int level);

/*! This method prints a text message on the screen, if debugging is
 * enabled. Otherwise, it does nothing. The message is thread safe,
 * therefore providing that the messages appear in the order they where
 * issued by the different threads.
 * All messages are suppressed when Debug is false. All messages with a
 * lower importance (higher number) than DebugLevel will be suppressed,
 * too. Debug level 0 messages will always be printed as long as
 * Debug is true.
 *     We use our own debugging method, since debugging threads is a more
 *     complicated experience than debugging single threaded
 *     contexts. This might change in future in the way that debug
 *     prints its messages to another logging facility provided by
 *     the platform.
 * Use setDebugLevel () to integrate adapt debug () to your platform.
 */
inline void TWDEBUG(int severity, const char *cformat, ...)
#ifdef __GNUC__
    __attribute__((format(printf, 2, 3)))
#endif
    ;

/*! Prints the message to the console if condition is true. */
inline void TWDEBUG(bool condition, int severity, const char *cformat, ...)
#ifdef __GNUC__
    __attribute__((format(printf, 3, 4)))
#endif
    ;

/* PROTECT executes x with GlobalMutex locked.
 *  Mostly used for debugging, as in P_ASSERT. */
#ifdef PROTECT
#undef PROTECT
#endif

/* clang-format off */
#define PROTECT(x) \
    do { \
        QMutexLocker l(&ThreadWeaver::GlobalMutex); \
        (x); \
    } while (0)
/* clang-format on */

/*! P_ASSERT ensures that error messages occur in the correct order. */
#ifdef P_ASSERT
#undef P_ASSERT
#endif

/* clang-format off */
#define P_ASSERT(x) \
    do { \
        QMutexLocker l(&ThreadWeaver::GlobalMutex); \
        Q_ASSERT(x); \
    } while (0)
/* clang-format on */

/*!
 */
inline void setDebugLevel(bool debug, int level)
{
    Debug = debug;
    DebugLevel = level;
}

#ifndef QT_NO_DEBUG

#define TWDEBUG(...) ThreadWeaver::threadweaver_debug(__VA_ARGS__)
/*!
 */
inline void threadweaver_debug(int severity, const char *cformat, ...)
{
    if (Debug == true && (severity <= DebugLevel || severity == 0)) {
        QString text;

        va_list ap;
        va_start(ap, cformat);
        PROTECT(vprintf(cformat, ap));
        va_end(ap);
    }
}

/*!
 */
inline void threadweaver_debug(bool condition, int severity, const char *cformat, ...)
{
    if (condition && Debug == true && (severity <= DebugLevel || severity == 0)) {
        QString text;

        va_list ap;
        va_start(ap, cformat);
        PROTECT(vprintf(cformat, ap));
        va_end(ap);
    }
}
#else
#define TWDEBUG(...)
#endif

// Macros to ensure that mutexes are locked or unlocked:
/*!
 */
void THREADWEAVER_EXPORT mutexAssertUnlocked(QMutex *mutex, const char *where);
/*!
 */
void THREADWEAVER_EXPORT mutexAssertLocked(QMutex *mutex, const char *where);

#ifndef QT_NO_DEBUG
#define MUTEX_ASSERT_UNLOCKED(x) mutexAssertUnlocked(x, Q_FUNC_INFO)
#define MUTEX_ASSERT_LOCKED(x) mutexAssertLocked(x, Q_FUNC_INFO)
#else
#define MUTEX_ASSERT_UNLOCKED(x)
#define MUTEX_ASSERT_LOCKED(x)
#endif

/*!
 */
inline bool invariant()
{
    return true;
}

#define INVARIANT Q_ASSERT_X(invariant(), __FILE__, "class invariant failed");

/* clang-format off */
#define REQUIRE(x) \
    INVARIANT \
    Q_ASSERT_X(x, Q_FUNC_INFO, "unfulfilled requirement " #x);

#define ENSURE(x) \
    INVARIANT \
    Q_ASSERT_X(x, Q_FUNC_INFO, "broken guarantee " #x);
/* clang-format on */

#ifdef QT_NO_DEBUG
#define DEBUGONLY(x)
#else
#define DEBUGONLY(x) x
#endif

}

#endif // DEBUGGINGAIDS_H