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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/52143] New: [OOP] ICE with polymorphic function result in gfc_class_vptr_get
Date: Mon, 06 Feb 2012 21:34:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52143

             Bug #: 52143
           Summary: [OOP] ICE with polymorphic function result in
                    gfc_class_vptr_get
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: burnus@gcc.gnu.org
                CC: pault@gcc.gnu.org


Found when creating a test case for PR 51514.

The following code causes an

test.f90:8:0: internal compiler error: tree check: expected record_type or
union_type or qual_union_type, have function_type in gfc_class_vptr_get, at
fortran/trans-expr.c:78

which is at

  vptr = gfc_advance_chain (TYPE_FIELDS (TREE_TYPE (decl)),
                            CLASS_VPTR_FIELD);

Backtrace:

#0  gfc_class_vptr_get (decl=0x2aaaacce2600)
    at trans-expr.c:78
#1  0x00000000005d3f0d in gfc_vtable_field_get (decl=<optimized out>, field=1)
    at trans-expr.c:91
#2  0x00000000005b1fa5 in build_class_array_ref (index=0x2aaaacbc3c90,
                              base=0x2aaaacced2a8, se=<optimized out>)
    at trans-array.c:2984
#3  gfc_conv_scalarized_array_ref (se=0x7fffffffce20, ar=<optimized out>)
    at trans-array.c:3037
#4  0x00000000005b2852 in gfc_conv_array_ref (se=0x7fffffffce20, ar=0x174a888,
                              sym=<optimized out>, where=<optimized out>)
    at trans-array.c:3112
#5  0x00000000005db098 in gfc_conv_variable (se=0x7fffffffce20, expr=0x174a620)
    at trans-expr.c:1333
#6  0x00000000005da874 in gfc_conv_expr_reference (se=0x7fffffffce20,
                                                   expr=<optimized out>)
    at trans-expr.c:5610
#7  0x00000000005de0b0 in gfc_conv_procedure_call (se=0x7fffffffcff0,
          sym=0x173e1f0, args=0x1746b50, expr=0x174aa10, append_args=0x0)
    at trans-expr.c:3540
#8  0x00000000006020c5 in gfc_trans_call (code=0x174af90,
         dependency_check=<optimized out>, mask=0x0, count1=0x0, invert=false)
    at trans-stmt.c:468



module mod_subpr
  type :: foo
    integer :: i = 2
  end type
contains
  function g ()
    class(foo), allocatable :: g(:)
    allocate (g(3)) 
  end function g
end module