[Patch, fortran] [4.7/4.8 Regression] [OOP] ICE on invalid: gfc_variable_attr(): Bad array reference

Tobias Burnus burnus@net-b.de
Wed Jan 2 14:56:00 GMT 2013


Dear Paul,

Paul Richard Thomas wrote:
> As noted by Janus in comment #2 of the PR, "I think the function
> 'copy_ts_from_selector_to_associate' comes too early (namely during
> parsing). It tries to resolve the target expr, which should rather
> wait until resolution stage!?!"
>
> It turned out that the function of the call to gfc_resolve_expr was to
> fix up the selector array reference type.  This has been done
> explicitly in this patch.
>
> Bootstraps and regtests on FC17/x86_64 - OK for trunk and 4.7?

It looks mostly okay; however, you do not handle vector sections 
correctly, which leads to an ICE. Without your patch, one gets:
    Error: CLASS selector at (1) needs a temporary which is not yet 
implemented

With your patch, it fails as one has:
(gdb) p ref->next->u.ar.type
$7 = AR_ELEMENT

(gdb) p ref->next->u.ar.dimen_type
$8 = {DIMEN_VECTOR, 0, 0, 0, 0, 0, 0}

Please fix the DIMEN_VECTOR handling and add a test case for it (e.g. 
the one below). Could you also check whether we have a PR for that "not 
yet implemented" error?

module gn
   type :: ncb
   end type ncb
   type, public :: tn
      class(ncb), allocatable, dimension(:) :: cb
   end type tn
contains
   integer function name(self)
     implicit none
     class (tn), intent(in) :: self
     select type (component => self%cb([4,7+1]))
     end select
   end function name
end module gn


I am not quite sure whether the following ICE has the same cause or a 
different one, but it also ICEs with your patch applied:

module gn
   type :: ncb
   end type ncb
   type, public :: tn
      class(ncb), allocatable :: cb[:]
   end type tn
contains
   integer function name(self)
     implicit none
     class (tn), intent(in) :: self
     select type (component => self%cb[4])
! ALSO FAILS: "(component => self%cb)"
     end select
   end function name
end module gn



Tobias



More information about the Gcc-patches mailing list