From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id 191453857C72; Tue, 30 Aug 2022 06:57:39 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 191453857C72
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1661842659;
	bh=GtfkRgo75i5EF7fnJdwXDfFjMhgZgufe7OC/n5QcDDw=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=larlu7PeDjxhxJiq6sA7a8+wTWJCcFpse2g2rZ/IwxRXCk2fKdizqttNxljboo7Pp
	 3e3OlC1BdspElbmtqXZpYYzxIAJ85zMqwKswyNkDZDCJetbDLh37+J8mWwpyjf5ysq
	 eXeow73OD6N5tlk5Em/MVvIbEa6l+ZLZEenDDFew=
From: "federico.perini at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/106771] [OOP] ICE with PACK intrinsic, in
 gfc_conv_expr_descriptor, at fortran/trans-array.c:7328
Date: Tue, 30 Aug 2022 06:57:38 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: fortran
X-Bugzilla-Version: 9.2.0
X-Bugzilla-Keywords: ice-on-valid-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: federico.perini at gmail dot com
X-Bugzilla-Status: WAITING
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-106771-4-o5oeO638mU@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-106771-4@http.gcc.gnu.org/bugzilla/>
References: <bug-106771-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106771

--- Comment #5 from federico <federico.perini at gmail dot com> ---
My bad, the SEGFAULT is my mistake, I've made a half-baked example that does
not work. Here's the fixed one:=20

module test
    implicit none

    type::t
       integer, allocatable :: iloc(:)
       contains=20
          procedure :: is_active =3D> isa
          procedure :: list2loc =3D> myfun_poly
    end type t

    contains

    elemental logical function isa(this,i)
       class(t), intent(in) :: this
       integer, intent(in) :: i
       integer :: n
       n =3D merge(size(this%iloc),0,allocated(this%iloc))
       if (i>0 .and. i<=3Dn) then ! Segmentation fault here=20
          isa =3D this%iloc(i)>0
       else
          isa =3D .false.
       endif=20=20
    end function isa

    ! internal compiler error: in gfc_conv_expr_descriptor, at
fortran/trans-array.c:7328
    function myfun_poly(this,IDs) result (ilocs)
        class(t), intent(in) :: this
        integer, intent(in) :: IDs(:)
        integer, allocatable :: ilocs(:)
        if (size(IDs)<=3D0) then
           allocate(ilocs(0))
        else
           ilocs =3D pack(this%iloc(IDs),this%is_active(IDs))
        endif
    end function myfun_poly

    ! WORKS
    function myfun(this,IDs) result (ilocs)
        type(t), intent(in) :: this
        integer, intent(in) :: IDs(:)
        integer, allocatable :: ilocs(:)
        if (size(IDs)<=3D0) then
           allocate(ilocs(0))
        else
           ilocs =3D pack(this%iloc(IDs),this%is_active(IDs))
        endif
    end function myfun
end module test=20=20=20=20

program testp
   use test
   implicit none

   type(t) :: a

   integer :: rnd(100),i
   real :: x(100)
   integer, allocatable :: list(:)

   ! Create a dummy initialization
   a%iloc =3D [(i,i=3D1,100)]

   call random_number(x); rnd =3D ceiling(x*99)

   ! Works
   print *, 'rnd=3D',rnd
   list =3D myfun(a,rnd)
   ! ICE
   list =3D a%list2loc(rnd)

   print *, 'list=3D',list

end program testp

The segfault is now gone, but the ICE remains for all versions until 10.3.0
(see https://godbolt.org/z/6TKa4sEe9)=