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Newsgroups: comp.lang.ada
Subject: Re: exception access violation
From: Georg Bauhaus <bauhaus@futureapps.de>
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Date: Mon, 13 Nov 2006 22:35:52 +0100
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Date: 2006-11-13T23:33:12+01:00
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On Mon, 2006-11-13 at 11:31 -0800, Jade wrote:
> Hi,
> I am compiling a program with gnat gps and I am receiving an access
> violation error.  And my program crashes at this point.
> 
>  Exception raised
>  >>> Exception Name        => PROGRAM_ERROR
> >>> Exception Message     => EXCEPTION_ACCESS_VIOLATION
> Does anyone know what this could mean?  

Could be related to memory access via the operation system, GNAT
experts might be able to tell.
This will be easier to say if you post some code. This excerpt is
from seh_init.c, which you can find in ${GNAT_DIR}/.../adainclude/

  switch (ExceptionRecord->ExceptionCode)
    {
    case EXCEPTION_ACCESS_VIOLATION:
      /* If the failing address isn't maximally-aligned or if the page
         before the faulting page is not accessible, this is a program error.
      */
      if ((ExceptionRecord->ExceptionInformation[1] & 3) != 0
          || IsBadCodePtr
          ((void *)(ExceptionRecord->ExceptionInformation[1] + 4096)))
        {
          exception = &program_error;
          msg = "EXCEPTION_ACCESS_VIOLATION";
        }
      else
        {
          /* otherwise it is a stack overflow  */
          exception = &storage_error;
          msg = "stack overflow (or erroneous memory access)";
        }
      break;



-- Georg