[Patch, fortran] PR59414 [4.8/4.9 Regression] [OOP] ICE in in gfc_conv_expr_descriptor on ALLOCATE inside SELECT TYPE

[Paul Richard Thomas]

Dear Janus,

....snip....

> well, actually the selector in the test case is not an array. And
> polymorphic arrays as such have been supported since 4.7.

duuh!  Shows how time flies when you're having fun!
>
>> Bootstrapped and regtested on FC17/x86_64 - OK for trunk and, after a
>> decent delay, 4.8?
>
> Yes, looks good to me. Thanks for the patch!

Thanks for the review.
>
>
>> PS I know of at least one other place where this manoeuvre had to be
>> done.  If I find a third, I will turn it into a function in class.c.
>> It might be worth doing anyway?
>
> I tend to agree. Up to you ...

I am debugging such a function but, for reasons that I have not yet
found, it recovers the original ICE :-(

Elsewhere, I have implemented the same removal of references in the
TREE_SSA representation for which there is a helper function.  I must
check if that is not possible here.

Cheers

Paul

>
> Cheers,
> Janus
>
>
>
>> 2014-01-20  Paul Thomas  <pault@gcc.gnu.org>
>>
>>     PR fortran/59414
>>     * trans-stmt.c (gfc_trans_allocate): Before the pointer
>>     assignment to transfer the source _vptr to a class allocate
>>     expression, the final class reference should be exposed. The
>>     tail that includes the _data and array references is stored.
>>     This reduced expression is transferred to 'lhs' and the _vptr
>>     added. Then the tail is restored to the allocate expression.
>>
>> 2014-01-20  Paul Thomas  <pault@gcc.gnu.org>
>>
>>     PR fortran/59414
>>     * gfortran.dg/allocate_class_3.f90 : New test



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