[Bug fortran/46330] New: [4.6 Regression] ICE after revision 166368

["dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46330

           Summary: [4.6 Regression] ICE after revision 166368
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: dominiq@lps.ens.fr
                CC: janus@gcc.gnu.org


Starting at revision 166368, the following code

!
http://groups.google.com/group/comp.lang.fortran/browse_thread/thread/76f99e7fd4f3e772#
module type2_type 
 implicit none 
 type, abstract :: Type2 
    character :: typeName*(30) = "unknown" 
 end type Type2 
 end module type2_type 

 module extended2A_type 
 use type2_type 
 implicit none 
 type, extends(Type2) :: Extended2A 
    real(kind(1.0D0)) :: coeff1 = 1. 
    real(kind(1.0D0)) :: coeff2 = 2. 
 contains 
    procedure :: setCoeff1 => Extended2A_setCoeff1 
 end type Extended2A 
 contains 
    function Extended2A_new(c1, c2) result(typePtr_) 
       real(kind(1.0D0)), optional, intent(in) :: c1 
       real(kind(1.0D0)), optional, intent(in) :: c2 
       type(Extended2A), pointer  :: typePtr_ 
       type(Extended2A), save, allocatable, target  :: type_ 
       allocate(type_) 
       typePtr_ => null() 
       if (present(c1)) call type_%setCoeff1(c1) 
       typePtr_ => type_ 
       if ( .not.(associated (typePtr_))) then 
          stop 'Error initializing Extended2A Pointer.' 
       endif 
    end function Extended2A_new 
    subroutine Extended2A_setCoeff1(this,c1) 
       class(Extended2A) :: this 
       real(kind(1.0D0)), intent(in) :: c1 
       this% coeff1 = c1 
    end subroutine Extended2A_setCoeff1 
 end module extended2A_type 

 module type1_type 
 use type2_type 
 implicit none 
 type Type1 
    class(type2), pointer :: type2Ptr => null() 
 contains 
    procedure :: initProc => Type1_initProc 
 end type Type1 
 contains 
    function Type1_initProc(this) result(iError) 
       use extended2A_type 
       implicit none 
       class(Type1) :: this 
       integer :: iError 
          this% type2Ptr => extended2A_new() 
          if ( .not.( associated(this% type2Ptr))) then 
             iError = 1 
             write(*,'(A)') "Something Wrong." 
          else 
             iError = 0 
          endif 
    end function Type1_initProc 
 end module type1_type 

 program main 
 use type1_type 
 use extended2A_type 
 implicit none 
 integer :: iErr, i 
 integer :: numArgs 
 character, dimension(:), allocatable :: tempArgs*(100) 
 class(type1), allocatable :: thisType1 
 allocate (Type1::thisType1) 
 iErr = thisType1%initProc() 
 deallocate (thisType1% type2Ptr)  ! What happens here???  See questions below. 
! now the pointer should be dangling and needs to be nullified / reassigned 
 end program main 

gives an ICE:

[macbook] f90/bug% gfcp pointers_type_red.f90
pointers_type_red.f90: In function 'type1_initproc':
pointers_type_red.f90:53:0: internal compiler error: Segmentation fault

The backtrace is

(gdb) bt
#0  0x00000001000ccd68 in gfc_conv_variable (se=0x7fff5fbfd4a0,
expr=0x1417316f0) at ../../p_work/gcc/fortran/trans-expr.c:578
#1  0x00000001000cc2df in gfc_trans_pointer_assignment (expr1=0x141731330,
expr2=0x1417316f0) at ../../p_work/gcc/fortran/trans-expr.c:4800
(gdb) p expr->symtree
$2 = (gfc_symtree *) 0x0