Re: GNAT exception traceback

[Spam Hater <no.such.user@no.such.com>]

> Or, as Wiljan notes, you can hack a-raise.c.
> The idea of using GDB to determine the program location, given a hex
> location, is certainly a reasonable one, though in general you really
> want the traceback which GDB can give you.

gcc C has a builtin function (macro?) for the return address.
Someone sent me C that uses this in a loop to get a stack trace.
Note the parameter to __builtin_frame_address - if I remember 
right, this allows you to say how high up the stack you want 
to go.  If that's right, and if it's not required to be static 
(using Ada's definition of static) then you could increment the 
parameter in a loop.  The  return_addr=  part of the following 
is not portable, but I'm not sure that's needed.

Anyway, for what it's worth (maybe nothing) this might be a 
starting point:

void stack_trace()
{
  char *current_frame
  int return_addr;
  /* obtain current frame address somehow, e.g. inline assembler or
     use gcc __builtin_frame_address. */
  current_frame=__builtin_frame_address(0);
  do {
    return_addr=*(int*)(current_frame+4);  /* obtain return addr */
    /* do whatever you want with the return addr here */
    current_frame=*(char*)current_frame;   /* get frame of next upper
function */
  } while( stack_valid() );
}

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    Wes Groleau, Hughes Defense Communications, Fort Wayne, IN USA
Senior Software Engineer - AFATDS                  Tool-smith Wanna-be

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