debugerror.h

/**
 * @file debugerror.h
 * @author Ambroz Bizjak <ambrop7@gmail.com>
 * 
 * @section LICENSE
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the author nor the
 *    names of its contributors may be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * @section DESCRIPTION
 * 
 * Mechanism for ensuring an object is destroyed from inside an error handler
 * or its jobs.
 */

#ifndef BADVPN_MISC_DEBUGERROR_H
#define BADVPN_MISC_DEBUGERROR_H

#include <misc/debug.h>
#include <base/BPending.h>

#ifndef NDEBUG
    #define DEBUGERROR(de, call) \
        { \
            ASSERT(!BPending_IsSet(&(de)->job)) \
            BPending_Set(&(de)->job); \
            (call); \
        }
#else
    #define DEBUGERROR(de, call) { (call); }
#endif

typedef struct {
    #ifndef NDEBUG
    BPending job;
    #else
    int dummy_field; // struct must have at least one field
    #endif
} DebugError;

static void DebugError_Init (DebugError *o, BPendingGroup *pg);
static void DebugError_Free (DebugError *o);
static void DebugError_AssertNoError (DebugError *o);

#ifndef NDEBUG
static void _DebugError_job_handler (DebugError *o)
{
    ASSERT(0);
}
#endif

void DebugError_Init (DebugError *o, BPendingGroup *pg)
{
    #ifndef NDEBUG
    BPending_Init(&o->job, pg, (BPending_handler)_DebugError_job_handler, o);
    #endif
}

void DebugError_Free (DebugError *o)
{
    #ifndef NDEBUG
    BPending_Free(&o->job);
    #endif
}

void DebugError_AssertNoError (DebugError *o)
{
    #ifndef NDEBUG
    ASSERT(!BPending_IsSet(&o->job))
    #endif
}

#endif