[Bug analyzer/93947] New: ICE: Segmentation fault (in symtab_node::ultimate_alias_target)

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93947

            Bug ID: 93947
           Summary: ICE: Segmentation fault (in
                    symtab_node::ultimate_alias_target)
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: analyzer
          Assignee: dmalcolm at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---

gcc-10.0.1-alpha20200223 snapshot (g:3133bed5d0327e8a9cd0a601b7ecdb9de4fc825d)
ICEs when compiling the following testcase, reduced from
gcc/testsuite/gcc.target/arm/thumb1-ual-1.c, w/ -O1 -fanalyzer:

struct pf {
  unsigned int iu : 2;
};

enum {
  qr, jv, vm, mz,
};

int uh;

void
w9 (struct pf *x2)
{
  switch (x2->iu)
    {
    case qr:
    case jv:
    case vm:
      uh = 0;
      break;

    case mz:
      break;

    default:
      __builtin_abort ();
    }
}

% gcc-10.0.1 -O1 -fanalyzer -c tsdnvtnl.c
during IPA pass: analyzer
tsdnvtnl.c: In function 'w9':
tsdnvtnl.c:25:5: internal compiler error: Segmentation fault
   25 |     default:
      |     ^~~~~~~
0xd8ba2f crash_signal
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200223/work/gcc-10-20200223/gcc/toplev.c:328
0x110d1c1 symtab_node::ultimate_alias_target(availability*, symtab_node*)
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200223/work/gcc-10-20200223/gcc/cgraph.h:3242
0x110d1c1 cgraph_node::ultimate_alias_target(availability*, symtab_node*)
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200223/work/gcc-10-20200223/gcc/cgraph.h:3263
0x110d1c1 ana::region_model::get_fndecl_for_call(gcall const*,
ana::region_model_context*)
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200223/work/gcc-10-20200223/gcc/analyzer/region-model.cc:6713
0x11113fb ana::region_model::on_call_pre(gcall const*,
ana::region_model_context*)
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200223/work/gcc-10-20200223/gcc/analyzer/region-model.cc:4175
0x10eab58 ana::exploded_node::on_stmt(ana::exploded_graph&, ana::supernode
const*, gimple const*, ana::program_state*, ana::state_change*) const
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200223/work/gcc-10-20200223/gcc/analyzer/engine.cc:1068
0x10eb0e1 ana::exploded_graph::process_node(ana::exploded_node*)
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200223/work/gcc-10-20200223/gcc/analyzer/engine.cc:2492
0x10eb5ca ana::exploded_graph::process_worklist()
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200223/work/gcc-10-20200223/gcc/analyzer/engine.cc:2310
0x10ebcf9 ana::impl_run_checkers(ana::logger*)
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200223/work/gcc-10-20200223/gcc/analyzer/engine.cc:3670
0x10ec79c ana::run_checkers()
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200223/work/gcc-10-20200223/gcc/analyzer/engine.cc:3727
0x10e1ef8 execute
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200223/work/gcc-10-20200223/gcc/analyzer/analyzer-pass.cc:84