/* impl.c.assert: ASSERTION IMPLEMENTATION
 *
 * $Id$
 * Copyright (c) 2001 Ravenbrook Limited.  See end of file for license.
 *
 * This source provides the AssertFail function which is
 * invoked by the assertion macros (see impl.h.assert).
 * It also provides for user-installed assertion failure handlers.
 */

#include "check.h"
#include "mpm.h"

SRCID(assert, "$Id$");


/* CheckLevel -- Control check level
 *
 * This controls the behaviour of Check methods unless MPS_HOT_RED
 * is defined, when it is effectively stuck at "CheckNONE".
 */

unsigned CheckLevel = CheckSHALLOW;


static void AssertLib(const char *cond, const char *id,
                      const char *file, unsigned line)
{
  WriteF(mps_lib_stderr,
         "\n"
         "MPS ASSERTION FAILURE\n"
         "\n"
         "Id:        $S\n", id,
         "File:      $S\n", file,
         "Line:      $U\n", (WriteFU)line,
         "Condition: $S\n", cond,
         "\n",
         NULL);

  mps_lib_abort();
}


static AssertHandler handler = &AssertLib;


AssertHandler AssertDefault(void)
{
  return &AssertLib;
}


AssertHandler AssertInstall(AssertHandler new)
{
  AssertHandler prev = handler;
  handler = new;
  return prev;
}


/* AssertFail -- fail an assertion
 *
 * This function is called when an ASSERT macro fails a test.  It
 * calls the installed assertion handler, if it is not NULL.  If
 * handler returns the progam continues.
 */
void AssertFail1(const char *s)
{
  if (handler != NULL)
    (*handler)(s, "", "", 0);
}


/* C. COPYRIGHT AND LICENSE
 *
 * Copyright (C) 2001-2002 Ravenbrook Limited <http://www.ravenbrook.com/>.
 * All rights reserved.  This is an open source license.  Contact
 * Ravenbrook for commercial licensing options.
 * 
 * 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. Redistributions in any form must be accompanied by information on how
 * to obtain complete source code for this software and any accompanying
 * software that uses this software.  The source code must either be
 * included in the distribution or be available for no more than the cost
 * of distribution plus a nominal fee, and must be freely redistributable
 * under reasonable conditions.  For an executable file, complete source
 * code means the source code for all modules it contains. It does not
 * include source code for modules or files that typically accompany the
 * major components of the operating system on which the executable file
 * runs.
 * 
 * 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, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS AND CONTRIBUTORS 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.
 */