Re: 20000717 ICE compiling gcc/tree.c on hppa2.0-hp-hpux10.20.gnu.org

["John David Anglin" <dave at hiauly1 dot hia dot nrc dot ca>]

> 
> > (gdb) p low
> > $4 = -20
> 
> The relevant code in calls.c (check_sibcall_argument_overlap) is
> 
>   low = arg->offset.constant;
>   for (high = low + arg->size.constant; low < high; low++)
>     SET_BIT (stored_args_map, low);
> 
> The second argument of SET_BIT must be non-negative.  Is the value
> of `low' reasonable for the hppa?  If so, check_sibcall_argument_overlap
> needs fixing to handle negative offsets.
> 
> The code for check_sibcall_argument_overlap is new.  It was added by
> Jakub Jelinek on July 17.

On the pa, ARGS_GROW_DOWNWARD is defined.  It would appear the stored_args_map
is not being managed properly in this case.  I tried changing the above
code to

#ifdef ARGS_GROW_DOWNWARD
  /* stack_slot is negative, but we want to index stored_args_map
	   with positive values.  */
  high = -arg->offset.constant + 1;
  low = high - arg->size.constant;
#else
  low = arg->offset.constant;
  high = low + arg->size.constant;
#endif
  for (i = low; i < high; i++)
    SET_BIT (stored_args_map, i);

but this isn't correct or the complete solution.  With this patch, the
build goes a little further but fails here:

stage1/xgcc -B/usr/local/hppa1.1-hp-hpux10.20/bin/ -Bstage1/ -c  -DIN_GCC    -W -Wall -Wtraditional -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -pedantic -Wno-long-long -g -O3  -DHAVE_CONFIG_H    -I. -I../../gcc -I../../gcc/config -I../../gcc/../include ../../gcc/expmed.c
xgcc: Internal error: Bus error (program cc1)

The bus error occured at the `sbitmap_free (stored_args_map)' call in
calls.c which simply free's the stored_args_map. I would guess the
malloc'd data is getting corrupted.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)